End cover assembly, energy storage device and electric equipment

Abstract

According to the end cover assembly, the energy storage device and the electric equipment, the stability of the internal structure of the energy storage device is improved, the safety risk is reduced, and the safety performance and the use reliability of the energy storage device are improved. The end cover assembly comprises an end cover, an anti-explosion valve, a lower insulating part, a pole and a pin, the end cover is provided with a first through hole and an anti-explosion hole, and the first through hole and the anti-explosion hole are spaced from each other; the anti-explosion valve is mounted on the end cover and covers the anti-explosion hole; a second through hole is formed in the lower insulating part, and the second through hole is communicated with the first through hole; the lower insulating part is provided with a boss, the boss is located between the anti-explosion valve and the second through hole, the boss, the anti-explosion valve and the second through hole are arranged at intervals, the boss is used for abutting against the battery cell assembly, the boss is provided with a first vent hole, and the first vent hole penetrates through the boss in the length direction of the lower insulating part; the pole penetrates through the first through hole and the second through hole; and the pin is positioned on one side, far away from the explosion-proof valve, of the boss and is fixedly connected with the pole.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an end cap assembly, an energy storage device, and an electrical appliance. Background Technology

[0002] As energy storage devices are used more and more widely, an increasing number of safety issues are emerging, raising concerns about their safety during use. During operation, the internal battery cells of energy storage devices are prone to vibration, leading to tearing of the tabs or loosening of the core windings. This severely affects the stability of the internal structure of the energy storage device, posing a significant safety hazard. Utility Model Content

[0003] This application provides an end cap assembly, an energy storage device, and an electrical device, which improves the stability of the internal structure of the energy storage device, reduces safety risks, and enhances the safety performance and reliability of the energy storage device.

[0004] This application provides an end cap assembly, including an end cap, an explosion-proof valve, a lower insulating component, a pole post, and pins. The end cap includes a first surface and a second surface, which are disposed opposite to each other along the thickness direction of the end cap. The end cap is provided with a first through hole and an explosion-proof hole, both of which penetrate the first surface and the second surface along the thickness direction of the end cap and are spaced apart from each other.

[0005] The explosion-proof valve is installed on the end cap and covers the explosion-proof hole;

[0006] The lower insulating member is located on the side of the second surface away from the first surface. The lower insulating member includes a third surface and a fourth surface. Along the thickness direction of the lower insulating member, the third surface and the fourth surface are disposed opposite to each other. The lower insulating member is provided with a second through hole. The second through hole penetrates the third surface and the fourth surface along the thickness direction of the lower insulating member and communicates with the first through hole.

[0007] The lower insulating member is provided with a boss. Along the length direction of the lower insulating member, the boss is located between the explosion-proof valve and the second through hole, and is spaced apart from both the explosion-proof valve and the second through hole. The boss is provided on the fourth surface and protrudes in a direction away from the third surface, and is used to abut against the battery cell assembly. The boss is provided with a first vent hole. Along the length direction of the lower insulating member, the first vent hole penetrates the boss.

[0008] The pole post passes through the first through hole and the second through hole;

[0009] The pin is located on the side of the fourth surface away from the third surface, and on the side of the boss away from the explosion-proof valve, and is fixedly connected to the pole post.

[0010] There are two of each of the first and second through holes. The two first through holes are located on opposite sides of the explosion-proof hole, and the two second through holes are spaced apart from each other and are connected to the two first through holes respectively.

[0011] There are two of each of the following: the boss, the pole post, and the pin. Each boss is located between the explosion-proof valve and a second through hole. Each pole post passes through a first through hole and a second through hole. Each pin is located on the side of a boss away from the explosion-proof valve and is fixedly connected to a pole post.

[0012] The lower insulating member is further provided with a first protrusion, which is located between the two protrusions and spaced apart from the two protrusions. The first protrusion is provided on the third surface and protrudes in a direction away from the fourth surface.

[0013] The lower insulating member is further provided with a first groove, the opening of the first groove is located on the third surface, the first groove is recessed from the third surface toward the boss, and communicates with the first vent hole.

[0014] There are multiple first grooves, which are evenly spaced along the width direction of the lower insulating member.

[0015] The lower insulating member is further provided with a second vent hole, which is located between the two protrusions and is opposite to the explosion-proof valve, and penetrates the lower insulating member along the thickness direction of the lower insulating member.

[0016] The lower insulating member is further provided with a third vent hole, which is located between the second vent hole and the boss, and is spaced apart from both the second vent hole and the boss, and penetrates the lower insulating member along the thickness direction of the lower insulating member.

[0017] The first convex hull further includes a first upper surface and a first lower surface, wherein the first upper surface and the third surface face the same direction, and the first lower surface is disposed opposite to the first upper surface;

[0018] The lower insulating component is further provided with a second groove, the opening of the second groove is located on the first upper surface, the second groove is recessed from the first upper surface to the first lower surface, and the second vent hole is provided on the bottom wall of the second groove and penetrates the bottom wall of the second groove.

[0019] This application also provides an energy storage device, which includes a housing, a battery cell assembly, and an end cap assembly as described above. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The battery cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing, closes the opening, and is electrically connected to the battery cell assembly.

[0020] This application also provides an electrical device including the above-described energy storage device, which is used to supply power to the electrical device.

[0021] The lower insulation component, end cap assembly, energy storage device, and electrical equipment provided in this application limit the position of the battery cell assembly by setting a boss on the lower insulation component and abutting against it. This prevents the electrode tabs from tearing or the core from loosening due to the shaking of the battery cell assembly, reduces the impact of the internal movement of the energy storage device along the thickness direction of the lower insulation component, improves the stability of the internal structure of the energy storage device, and enhances the safety performance and reliability of the energy storage device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0023] Figure 1 This is a schematic diagram of the energy storage device structure provided in the embodiments of this application;

[0024] Figure 2 yes Figure 1 A schematic diagram of the end cap assembly structure of the energy storage device shown;

[0025] Figure 3 yes Figure 2 The exploded view of the end cap assembly is shown.

[0026] Figure 4 yes Figure 2 The diagram shows the structure of the end cap assembly after being cut open along point AA.

[0027] Figure 5 yes Figure 3 The diagram shows the structure of the lower insulating component in the end cap assembly.

[0028] Figure 6 yes Figure 3 A schematic diagram of the lower insulating component in the end cap assembly from another angle;

[0029] Figure 7 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly taken along point AA.

[0030] Reference numerals: Energy storage device 1000, housing 2000, end cap assembly 3000, opening 2001, end cap 100, explosion-proof valve 200, protective plate 300, lower insulating component 400, pole post 500, pin 600, upper insulating component 700, sealing ring 800, first surface 101, second surface 102, first peripheral side 103, second protrusion 110, second upper surface 111, second side 112, second lower surface 113, explosion-proof hole 120. First injection hole 130, first through hole 140, third surface 401, fourth surface 402, second peripheral side 403, first convex 410, first upper surface 411, first side 412, first lower surface 413, boss 420, first vent hole 421, first groove 430, second groove 440, bottom wall of groove 441, side wall of groove 442, second injection hole 450, second vent hole 460, third vent hole 470, second through hole 480. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the energy storage device 1000 provided in the embodiments of this application.

[0033] This application provides an energy storage device 1000, which may include, but is not limited to, single-cell batteries, battery modules, battery packs, and battery systems. The actual application form of the energy storage device provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1000. This application embodiment uses a square battery as an example for illustration.

[0034] The energy storage device 1000 includes a housing 2000, a battery cell assembly, and an end cap assembly 3000. The housing 2000 has a receiving cavity and an opening 2001. The receiving cavity is located inside the housing 2000 and contains an electrolyte. The opening 2001 is located on the top side of the receiving cavity and communicates with it. The housing 2000 may be made of aluminum; that is, the housing 2000 may be an aluminum shell. The battery cell assembly is housed in the receiving cavity. The battery cell assembly can be immersed in the electrolyte. The end cap assembly 3000 is mounted on the housing 2000, closes the opening 2001, and is electrically connected to the battery cell assembly.

[0035] Please see Figures 2 to 4, Figure 2 yes Figure 1 A schematic diagram of the end cap assembly 3000 of the energy storage device 1000 is shown. Figure 3 yes Figure 2 The diagram shows an exploded view of the end cap assembly 3000. Figure 4 yes Figure 2 The diagram shows the structure of the end cap assembly 3000 after being cut along point AA.

[0036] The end cap assembly 3000 includes an end cap 100, an explosion-proof valve 200, a protective plate 300, a lower insulator 400, a terminal post 500, a lead 600, an upper insulator 700, and a sealing ring 800. The explosion-proof valve 200 and the protective plate 300 are both mounted on the end cap 100. Along the thickness direction of the end cap assembly 3000, the lower insulator 400 is located on one side of the end cap 100. Along the thickness direction of the end cap assembly 3000, the terminal post 500 passes through the end cap 100 and the lower insulator 400. There are two terminal posts 500, arranged at intervals along the length direction of the end cap assembly 3000. One terminal post 500 serves as the positive terminal post, and the other terminal post 500 serves as the negative terminal post. The lead 600 is located on the side of the lower insulator 400 opposite to the end cap 100 and is electrically connected to the terminal post 500 and the tab of the cell assembly. There are two pins 600, each fixedly connected to a terminal 500. One pin 600 serves as the positive pin and is electrically connected to the positive terminal and the positive tab of the cell assembly. The other pin 600 serves as the negative pin and is electrically connected to the negative terminal and the negative tab of the cell assembly. An upper insulating member 700 is installed between the terminal 500 and the end cap 100. There are two upper insulating members 700, each installed between the terminal 500 and the end cap 100. One upper insulating member 700 serves as the positive insulating member and is installed between the positive terminal and the end cap 100. The other upper insulating member 700 serves as the negative insulating member and is installed between the negative terminal and the end cap 100. A sealing ring 800 is fitted onto the upper insulating member 700 and clamped between the end cap 100 and the pin 600. There are two sealing rings 800. Each sealing ring 800 is fitted onto an upper insulating member 700 and clamped between the end cap 100 and a pin 600. One sealing ring 800 serves as the positive electrode sealing ring, fitted onto the positive electrode insulating member and clamped between the end cap 100 and the positive electrode pin. The other sealing ring 800 serves as the negative electrode sealing ring, fitted onto the negative electrode insulating member and clamped between the end cap 100 and the negative electrode pin.

[0037] In this embodiment, the end cap 100 can be a smooth aluminum sheet made of aluminum. The end cap 100 includes a first surface 101, a second surface 102, and a first peripheral side surface 103. Along the thickness direction of the end cap 100, the first surface 101 and the second surface 102 are disposed opposite to each other. The first peripheral side surface 103 connects between the first surface 101 and the second surface 102. The end cap 100 is provided with a second protrusion 110. The second protrusion 110 is located in the middle of the end cap 100 and is spaced apart from the first peripheral side surface 103. The second protrusion 110 is disposed on the first surface 101 and protrudes in a direction away from the first surface 101. The second protrusion 110 includes a second upper surface 111, a second side surface 112, and a second lower surface 113. The second upper surface 111 is spaced apart from the first surface 101. The second side surface 112 surrounds the second protrusion 110 and connects the second upper surface 111 and the first surface 101. The second lower surface 113 is disposed opposite to the second upper surface 111. For example, the second protrusion 110 is formed by stamping. During the stamping process of forming the second protrusion 110, a groove corresponding to the second protrusion 110 is simultaneously formed on the end cap 100.

[0038] The end cap 100 is also provided with an explosion-proof hole 120, a first injection hole 130, and a first through hole 140. The explosion-proof hole 120, the first injection hole 130, and the first through hole 140 penetrate the end cap 100 along its thickness direction and are spaced apart from the first peripheral side surface 103. Specifically, the explosion-proof hole 120 and the first injection hole 130 are both located on the second protrusion 110 and penetrate the second protrusion 110 along its thickness direction. Along the length of the second protrusion 110, the explosion-proof hole 120 is located in the middle of the second protrusion 110 and is spaced apart from the second side surface 112. The first injection hole 130 is located on one side of the explosion-proof hole 120 and is spaced apart from it. The first through hole 140 penetrates the end cap 100 along its thickness direction and is spaced apart from the second protrusion 110. There are two first through holes 140. Along the length of the end cap 100, two first through holes 140 are located on both sides of the second protrusion 110, for the electrode post 500 to pass through. Specifically, one first through hole 140 is for the positive electrode post to pass through, and the other first through hole 140 is for the negative electrode post to pass through.

[0039] The explosion-proof valve 200 covers the opening of the explosion-proof hole 120 facing the second lower surface 113. The protective plate 300 covers the opening of the explosion-proof hole 120 facing the second upper surface 111 and protects the explosion-proof valve 200.

[0040] Please see Figure 5 and Figure 6 , Figure 5 yes Figure 3 The diagram shows the structure of the lower insulating component 400 in the end cap assembly 3000. Figure 6 yes Figure 3The diagram shows the structure of the lower insulating member 400 in the end cap assembly 3000 from another angle.

[0041] The lower insulating member 400 is located on the side of the end cap 100 near the second surface 102. The lower insulating member 400 includes a third surface 401, a fourth surface 402, and a second peripheral side surface 403. The third surface 401 is the surface of the lower insulating member 400 near the second surface 102. Along the thickness direction of the lower insulating member 400, the fourth surface 402 is disposed opposite to the third surface 401. The second peripheral side surface 403 connects the third surface 401 and the fourth surface 402.

[0042] The lower insulating member 400 is provided with a first protrusion 410 and a boss 420. The first protrusion 410 is located in the middle of the lower insulating member 400 and is spaced apart from the second peripheral side 403. The first protrusion 410 is provided on the third surface 401 and protrudes in a direction away from the fourth surface 402. The first protrusion 410 is correspondingly provided with the second protrusion 110. It should be noted that the corresponding provision of the first protrusion 410 and the second protrusion 110 means that the orthographic projection of the first protrusion 410 on the end cap 100 at least partially covers the second protrusion 110. The first protrusion 410 includes a first upper surface 411, a first side surface 412, and a first lower surface 413. The first upper surface 411 faces the same direction as the third surface 401 and is spaced apart from the third surface 401. The first side surface 412 surrounds the first protrusion 410 and connects the first upper surface 411 and the third surface 401. The first lower surface 413 is opposite to the first upper surface 411.

[0043] The boss 420 is located at the end of the lower insulating member 400 and is spaced apart from the first protrusion 410, the explosion-proof valve 200, and the second through hole 480. The boss 420 is located on the fourth surface 402 and protrudes away from the third surface 401, and can abut against the battery cell assembly to limit the positioning of the battery cell assembly. There are two bosses 420. Along the length of the lower insulating member 400, the two bosses 420 are located on opposite sides of the first protrusion 410. For example, the boss 420 is elongated, and the length direction of the boss 420 is parallel to the width direction of the lower insulating member 400.

[0044] By setting the boss 420 to limit the battery cell assembly, the battery cell assembly can be fixed, avoiding the situation where the battery cell assembly shakes and the tabs are torn or the core becomes loose. This reduces the impact of the battery cell assembly moving along the thickness direction of the lower insulation component 400 inside the energy storage device 1000, improves the stability of the internal structure of the energy storage device 1000, and enhances the safety performance and reliability of the energy storage device 1000.

[0045] The boss 420 is provided with a first vent 421. The first vent 421 extends through the boss 420 along the length of the lower insulating member 400. There are multiple first vents 421, which are spaced apart along the length of the boss 420, so that airflow at the pins 600 on both sides can flow through the first vents 421 to the area in the lower insulating member 400 corresponding to the explosion-proof valve 200, so as to ensure that the energy storage device 1000 can open the valve and vent in time during thermal runaway, which helps to improve the safety performance of the energy storage device 1000.

[0046] The lower insulating member 400 is further provided with a first groove 430, a second groove 440, a second liquid injection hole 450, a second vent hole 460, a third vent hole 470, and a second through hole 480. The first groove 430 is spaced apart from the first protrusion 410 and is located at the position corresponding to the protrusion 420 on the lower insulating member 400. The opening of the first groove 430 is located on the third surface 401. The first groove 430 is recessed from the third surface 401 toward the protrusion 420 and communicates with the first vent hole 421, so that the airflow at the pin 600 passes through the first vent hole 421, enters the first groove 430, and then flows into the gap between the lower insulating member 400 and the end cap 100, thereby improving the air permeability of the lower insulating member 400. There are multiple first grooves 430. Along the length of the lower insulating member 400, a portion of the first grooves 430 are located on one side of the first protrusion 410 and are evenly spaced along the length of the boss 420; another portion of the first grooves 430 are located on the other side of the first protrusion 410 and are evenly spaced along the length of the boss 420. The distance between any two adjacent first grooves 430 is equal, which ensures that the lower insulating member 400 has a uniform wall thickness at the boss 420, thereby avoiding shrinkage of the lower insulating member 400 during injection molding and improving the pass rate of product appearance and dimensions.

[0047] The second groove 440 is located in the middle of the first protrusion 410, and is spaced apart from the first side surface 412. The opening of the second groove 440 is located on the first upper surface 411. The second groove 440 is recessed from the first upper surface 411 to the first lower surface 413. The second groove 440 is correspondingly positioned to correspond with the explosion-proof valve 200. It should be noted that the second groove 440 corresponding to the explosion-proof valve 200 means that the orthographic projection of the second groove 440 on the end cap 100 at least partially covers the explosion-proof valve 200. The second groove 440 includes a bottom wall surface 441 and a side wall surface 442. The bottom wall surface 441 is opposite to the opening of the second groove 440. The bottom wall surface 441 is spaced apart from and opposite to the explosion-proof valve 200. The design of the second groove 440 increases the gap between the lower insulating member 400 and the explosion-proof valve 200. Airflow inside the energy storage device 1000, after passing through the lower insulating member 400, can flow from the gap between the bottom wall surface 441 of the groove and the explosion-proof valve 200 to the explosion-proof valve 200, enabling the explosion-proof valve 200 to open promptly and improving the safety performance and reliability of the energy storage device 1000. The side wall surface 442 of the groove surrounds the second groove 440 and connects the bottom wall surface 441 of the groove with the first upper surface 411.

[0048] The second injection hole 450, the second vent hole 460, the third vent hole 470, and the second through hole 480 all penetrate the lower insulating member 400 along its thickness direction. The second injection hole 450, the second vent hole 460, and the third vent hole 470 are all located on the first protrusion 410 and penetrate the first protrusion 410 along its thickness direction. Specifically, along the length of the lower insulating member 400, the second injection hole 450 is located on one side of the second groove 440 and is spaced apart from the second groove 440. The second injection hole 450 communicates with the first injection hole 130. During the injection process of the energy storage device 1000, external electrolyte can flow into the interior of the energy storage device 1000 sequentially from the first injection hole 130 and the second injection hole 450.

[0049] The second vent 460 is disposed on the bottom wall of the second groove 440 and penetrates the bottom wall of the second groove 440. The second vent 460 is disposed opposite to the explosion-proof valve 200. There are multiple second vents 460, which are spaced apart from each other. For example, the second vent 460 is elongated, and its length direction is parallel to the width direction of the lower insulating member 400. There are multiple third vents 470, which are spaced apart from each other. Specifically, along the length direction of the lower insulating member 400, a portion of the third vents 470 are located on one side of the second groove 440 and are spaced apart from the second groove 440, while another portion of the third vents 470 are located on the other side of the second groove 440 and are spaced apart from the second groove 440.

[0050] Please see Figure 7 , Figure 7 yes Figure 2 The diagram shows a cross-sectional view of the end cap assembly 3000 taken along point AA, where the arrows represent the flow direction of the gas inside the energy storage device 1000.

[0051] In this embodiment, by providing a first vent 421, a second vent 460, and a third vent 470, the airflow generated inside the energy storage device 1000 is ensured to flow rapidly to the explosion-proof valve 200, allowing the explosion-proof valve 200 to open in a timely manner. Specifically, when the energy storage device 1000 experiences thermal runaway, the end cap 100 undergoes slight deformation, creating a gap between the lower insulating component 400 and the end cap. The high-temperature, high-pressure airflow generated inside the energy storage device 1000 first reaches the top of the battery cell assembly through the channel between the pin 600 and the battery cell assembly, and then rapidly enters the area below the explosion-proof valve 200 through the three-dimensional air passage constructed by the first vent 421, the second vent 460, and the third vent 470. The explosion-proof valve 200 then promptly releases pressure, ensuring the venting performance and reliability of the energy storage device 1000.

[0052] Please continue reading. Figure 5 and Figure 6 The second through hole 480 is located on the side of the boss 420 away from the explosion-proof valve 200 and is spaced apart from the boss 420. There are two second through holes 480. Along the length of the lower insulating member 400, each second through hole 480 is located on the side of a boss 420 away from the explosion-proof valve 200, and each second through hole 480 communicates with a first through hole 140. Specifically, one second through hole 480 communicates with one first through hole 140, allowing the positive terminal to pass through. The other second through hole 480 communicates with the other first through hole 140, allowing the negative terminal to pass through.

[0053] Please continue to refer to this. Figure 4 Along the thickness direction of the end cap assembly 3000, each pole post 500 passes through a first through hole 140 and a second through hole 480. Each pin 600 is located on the side of the fourth surface 402 away from the third surface 401 and on the side of a boss 420 away from the explosion-proof valve 200, and is fixedly connected to a pole post 500. Each upper insulating member 700 is disposed around a pole post 500 and passes through a first through hole 140 and a second through hole 480. Each sealing ring 800 is sleeved on an upper insulating member 700 and passes through a second through hole 480, and is clamped between the second surface 102 of the end cap 100 and the surface of a pin 600 near the lower insulating member 400. This not only seals the gap between the upper insulating member 700 and the lower insulating member 400, ensuring good airtightness of the end cap assembly 3000, but also insulates the end cap 100 from the pin 600.

[0054] The energy storage device 1000 provided in this embodiment, by providing a boss 420 on the lower insulating member 400 and abutting against the cell assembly, achieves the limitation of the cell assembly, avoids the situation of the tabs being torn or the core becoming loose due to the shaking of the cell assembly, reduces the impact of the internal movement of the energy storage device 1000 along the thickness direction of the lower insulating member 400, improves the stability of the internal structure of the energy storage device 1000, and enhances the safety performance and reliability of the energy storage device 1000.

[0055] This embodiment also provides an electrical device, such as an energy storage cabinet or a new energy vehicle. This electrical device includes the energy storage device 1000 described in the above embodiment. Since the specific structure and technical effects of the energy storage device 1000 have already been described in detail above, they will not be repeated here. The electrical device provided in this embodiment, by incorporating the aforementioned energy storage device 1000, improves the exhaust performance and operational safety and reliability of the electrical device.

[0056] The above descriptions are merely optional embodiments of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this application and are not intended to limit the patent scope of this application. At the same time, for those skilled in the art, equivalent structural transformations made based on the concept of this application and using the specification and drawings of this application, or direct / indirect applications in other related technical fields, all fall within the patent protection scope of this application.

Claims

1. An end cap assembly, characterized in that, The device includes an end cap, an explosion-proof valve, a lower insulating component, a pole post, and pins. The end cap includes a first surface and a second surface, which are arranged opposite to each other along the thickness direction of the end cap. The end cap is provided with a first through hole and an explosion-proof hole, which both penetrate the first surface and the second surface along the thickness direction of the end cap and are spaced apart from each other. The explosion-proof valve is installed on the end cap and covers the explosion-proof hole; The lower insulating member is located on the side of the second surface away from the first surface. The lower insulating member includes a third surface and a fourth surface. Along the thickness direction of the lower insulating member, the third surface and the fourth surface are disposed opposite to each other. The lower insulating member is provided with a second through hole. The second through hole penetrates the third surface and the fourth surface along the thickness direction of the lower insulating member and communicates with the first through hole. The lower insulating member is provided with a boss. Along the length direction of the lower insulating member, the boss is located between the explosion-proof valve and the second through hole, and is spaced apart from both the explosion-proof valve and the second through hole. The boss is provided on the fourth surface and protrudes in a direction away from the third surface, and is used to abut against the battery cell assembly. The boss is provided with a first vent hole. Along the length direction of the lower insulating member, the first vent hole penetrates the boss. The pole post passes through the first through hole and the second through hole; The pin is located on the side of the fourth surface away from the third surface, and on the side of the boss away from the explosion-proof valve, and is fixedly connected to the pole post.

2. The end cap assembly according to claim 1, characterized in that, There are two first through holes and two second through holes. The two first through holes are located on opposite sides of the explosion-proof hole, and the two second through holes are spaced apart from each other and are connected to the two first through holes respectively. There are two of each of the following: the boss, the pole post, and the pin. Each boss is located between the explosion-proof valve and a second through hole. Each pole post passes through a first through hole and a second through hole. Each pin is located on the side of a boss away from the explosion-proof valve and is fixedly connected to a pole post.

3. The end cap assembly according to claim 2, characterized in that, The lower insulating member is further provided with a first protrusion, which is located between the two protrusions and spaced apart from the two protrusions. The first protrusion is provided on the third surface and protrudes in a direction away from the fourth surface.

4. The end cap assembly according to any one of claims 1-3, characterized in that, The lower insulating member is further provided with a first groove, the opening of the first groove is located on the third surface, the first groove is recessed from the third surface toward the boss, and communicates with the first vent hole.

5. The end cap assembly according to claim 4, characterized in that, There are multiple first grooves, which are evenly spaced along the width direction of the lower insulating member.

6. The end cap assembly according to claim 3, characterized in that, The lower insulating member is also provided with a second vent hole, which is located between the two protrusions and is opposite to the explosion-proof valve, and penetrates the lower insulating member along the thickness direction of the lower insulating member.

7. The end cap assembly according to claim 6, characterized in that, The lower insulating member is also provided with a third vent hole, which is located between the second vent hole and the boss, and is spaced apart from both the second vent hole and the boss, and penetrates the lower insulating member along the thickness direction of the lower insulating member.

8. The end cap assembly according to claim 6 or 7, characterized in that, The first convex hull also includes a first upper surface and a first lower surface, wherein the first upper surface and the third surface face the same direction, and the first lower surface is disposed opposite to the first upper surface; The lower insulating component is further provided with a second groove, the opening of the second groove is located on the first upper surface, the second groove is recessed from the first upper surface to the first lower surface, and the second vent hole is provided on the bottom wall of the second groove and penetrates the bottom wall of the second groove.

9. An energy storage device, characterized in that, The energy storage device includes a housing, a cell assembly, and an end cap assembly as described in any one of claims 1 to 8. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing, closes the opening, and is electrically connected to the cell assembly.

10. An electrical appliance, characterized in that, The device includes the energy storage device of claim 9, which is used to supply power to the electrical equipment.

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