Lower insulating piece, end cover assembly, energy storage device and electric appliance

Abstract

This application provides a lower insulating member, 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 and enhances its safety performance. The lower insulating member has a first surface and a second surface disposed opposite to each other. The lower insulating member is provided with a first skirt, a second skirt, and a first boss on the second surface. The first skirt and the second skirt are spaced apart along the width direction of the lower insulating member. The first skirt has a first outer end face facing away from the second skirt, and the second skirt has a second outer end face facing away from the first skirt. The first boss is located between the first skirt and the second skirt, and has a first end face, a second end face, and a third surface facing away from the second surface. The first end face is the surface of the first boss facing the first skirt and is spaced apart from the first outer end face; the second end face is the surface of the first boss facing the second skirt and is spaced apart from the second outer end face; the third surface is located on the side of the first skirt and the second skirt facing away from the second surface.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a lower insulating component, an end cap assembly, an energy storage device, and an electrical device. 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. In the event of thermal runaway, the internal pressure of an energy storage device increases, affecting the structural stability of the end cap assembly and posing a significant safety hazard. Utility Model Content

[0003] This application provides a lower insulation component, 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 a lower insulating member for use in an energy storage device. The lower insulating member has a first surface and a second surface, and the second surface and the first surface are disposed opposite to each other along the thickness direction of the lower insulating member.

[0005] The lower insulating member is provided with a first skirt, a second skirt, and a first boss. The first skirt, the second skirt, and the first boss are all located on the second surface. Along the width direction of the lower insulating member, the first skirt and the second skirt are spaced apart and arranged opposite to each other. The first skirt has a first outer end face away from the second skirt, and the second skirt has a second outer end face away from the first skirt. The first boss is located between the first skirt and the second skirt. The first boss has a third surface, a first end face, and a second end face. The third surface is the surface of the first boss away from the second surface and is located on the side of the first skirt and the second skirt away from the second surface, and is used to abut against the cell assembly of the energy storage device. The first end face is the surface of the first boss facing the first skirt and is spaced apart from the first outer end face. The second end face is the surface of the first boss facing the second skirt and is spaced apart from the second outer end face.

[0006] Wherein, along the width direction of the lower insulating member, the thickness of the first skirt is H1, the thickness of the second skirt is H2, the distance between the first end face and the first outer end face is L1, and the distance between the second end face and the second outer end face is L2, wherein 30%≤L1 / H1≤100% and 30%≤L2 / H2≤100%.

[0007] The first boss is connected between the first skirt edge and the second skirt edge.

[0008] The lower insulating member is provided with a first pole hole, which penetrates the first surface and the second surface;

[0009] The lower insulating member is further provided with a second protrusion, which is disposed on the second surface and located between the first protrusion and the first electrode hole, and is spaced apart from both the first protrusion and the first electrode hole. The second protrusion includes a fourth surface, a third end face, and a fourth end face. The fourth surface is the surface of the second protrusion facing away from the second surface and is located on the side of the first skirt and the second skirt facing away from the second surface, and is used to abut against the cell assembly of the energy storage device. The third end face is the surface of the second protrusion facing the first skirt and is spaced apart from the first outer end face. The fourth end face is the surface of the second protrusion facing the second skirt and is spaced apart from the second outer end face.

[0010] Wherein, along the width direction of the lower insulating member, the thickness of the first skirt is H1, the thickness of the second skirt is H2, the distance between the third end face and the first outer end face is L3, and the distance between the fourth end face and the second outer end face is L4, wherein 30%≤L3 / H1≤100% and 30%≤L4 / H2≤100%.

[0011] The second boss is connected between the first skirt edge and the second skirt edge.

[0012] The second boss is provided with a through hole, which extends through the second boss along the length of the lower insulating member.

[0013] The lower insulating member is further provided with a plurality of first vent holes, which penetrate the first surface and the second surface and are spaced apart from each other along the length of the lower insulating member. A portion of the first vent holes are located on one side of the first boss, and another portion of the first vent holes are located on the other side of the first boss.

[0014] The length direction of the first vent hole is parallel to the width direction of the lower insulating member.

[0015] The lower insulating component is further provided with a groove and a second vent hole. The opening of the groove is located on the first surface. The groove is corresponding to the first boss. The groove has a bottom wall surface, and the bottom wall surface is opposite to the opening of the groove.

[0016] The second vent hole penetrates the third surface and the bottom wall of the groove.

[0017] The length direction of the second vent is perpendicular to the length direction of the first vent.

[0018] There are multiple second vent holes, which are arranged at intervals along the width direction of the lower insulating member.

[0019] The groove also has a first groove sidewall and a second groove sidewall. Along the length of the lower insulating member, the first groove sidewall and the second groove sidewall are arranged opposite to each other and are respectively connected to opposite sides of the bottom wall of the groove.

[0020] The lower insulating component is also provided with reinforcing ribs, which are disposed on the bottom wall of the groove and connected between the first groove side wall and the second groove side wall, and are spaced apart from the second vent hole.

[0021] The reinforcing ribs are multiple and are arranged at intervals along the width direction of the lower insulating member, with each reinforcing rib located between two adjacent second vent holes.

[0022] The lower insulating member is further provided with a plurality of third vent holes, which penetrate the first surface and the second surface and are spaced apart from each other. Along the length of the lower insulating member, a portion of the third vent holes are located on one side of the first vent hole, and another portion of the third vent holes are located on the other side of the first vent hole.

[0023] This application also provides an end cap assembly, including any of the lower insulating members, an end cap and an explosion-proof valve described above. The end cap is located on the side of the first surface away from the second surface. The end cap is provided with an explosion-proof hole that penetrates the end cap along the thickness direction and is correspondingly provided with the first boss.

[0024] The explosion-proof valve is installed on the end cap and covers the explosion-proof hole.

[0025] This application also provides an energy storage device, which includes a housing, a battery cell assembly, and the aforementioned end cap assembly. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing, and 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.

[0026] The end cap assembly is mounted on the housing and closes the opening, and is electrically connected to the cell assembly, with the third surface abutting against the cell assembly.

[0027] The energy storage device further includes a Mylar membrane, which is housed in the receiving cavity and located between the housing and the battery cell assembly, and is thermally fused to the first outer end face and the second outer end face.

[0028] This application also provides an electrical device including any of the above-described energy storage devices, the energy storage devices being used to supply power to the electrical device.

[0029] This application, by setting a third surface that protrudes relative to the first and second skirts, and by spacing the first end face from the first outer end face and the second end face from the second outer end face, not only increases the demolding stress points of the lower insulating component during injection molding, making it easier to demold, but also provides a certain deformation space for the lower insulating component. In the event of thermal runaway in the energy storage device, when the internal pressure is too high and the end cover deforms and arches, the pressure of the end cover on the lower insulating component is reduced, making the lower insulating component less likely to be damaged. This allows the first and second protrusions to better resist and restrict the battery cell assembly, improving the stability of the internal structure of the energy storage device, reducing safety risks, and improving the safety performance and reliability of the energy storage device. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the energy storage device structure provided in the embodiments of this application;

[0032] Figure 2 yes Figure 1 A partial structural diagram of the end cap assembly and Mylar membrane cut along point AA in the energy storage device shown.

[0033] Figure 3 yes Figure 1 The diagram shows the structure of the end cap assembly in the energy storage device.

[0034] Figure 4 yes Figure 3 The exploded structural diagram of the end cap assembly shown;

[0035] Figure 5 yes Figure 3 The diagram shows a cross-section of the end cap assembly along point BB.

[0036] Figure 6 yes Figure 3 The diagram shows a cross-section of the end cap assembly along point CC.

[0037] Figure 7 yes Figure 3 The diagram shows the end cap assembly from another angle.

[0038] Figure 8 yes Figure 4 The diagram shows the structure of the lower insulating component in the end cap assembly.

[0039] Figure 9 yes Figure 8 The diagram shows the structure of the lower insulating component from another angle.

[0040] Figure 10 yes Figure 9 The diagram shows a partial structural schematic of the lower insulating component after it has been cut open along DD.

[0041] Figure 11 yes Figure 9 The diagram shows a partially enlarged view of region b in the lower insulating component.

[0042] Reference numerals: Energy storage device 1000, housing 2000, end cap assembly 3000, Mylar membrane 4000, opening 2001, lower insulator 100, end cap 200, explosion-proof valve 300, protective plate 400, pole post 500, pin 600, upper insulator 700, sealing ring 800, first surface 101, second surface 102, peripheral surface 103, first peripheral surface 103a, second peripheral surface 103b, first skirt 110, second skirt 120, first outer end face 111, second... Outer end face 121, first boss 130, second boss 140, third surface 131, first end face 132, second end face 133, fourth surface 141, third end face 142, fourth end face 143, through hole 145, groove 150, second vent hole 170, first vent hole 180, third vent hole 190, first pole post hole 195, bottom wall of groove 151, first side wall of groove 152, second side wall of groove 153, reinforcing rib Q, explosion-proof hole 210, second pole post hole 220. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Please refer to the following: Figure 2 and Figure 3 , Figure 2 yes Figure 1 The diagram shows a partial structural view of the end cap assembly 3000 and the Mylar membrane 4000 cut along line AA in the energy storage device 1000. Figure 3 yes Figure 1 The diagram shows the structure of the end cap assembly 3000 in the energy storage device 1000.

[0047] The energy storage device 1000 includes a housing 2000, a battery cell assembly, an end cap assembly 3000, and a Mylar membrane 4000. The housing 2000 has a receiving cavity (not shown) 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 an aluminum shell made of aluminum. 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. The Mylar membrane 4000 is housed in the receiving cavity, located between the housing 2000 and the battery cell assembly, and wraps around the battery cell assembly. It is also connected to the end cap assembly 3000. The Mylar membrane and the end cap assembly are connected by heat fusion.

[0048] Please see Figures 4 to 7 , Figure 4 yes Figure 3 The diagram shows an exploded view of the end cap assembly 3000. Figure 5 yes Figure 3 The diagram shows a cross-section of the end cap assembly 3000 along point BB. Figure 6 yes Figure 3 The diagram shown is a cross-section of the end cap assembly 3000 along the CC direction. Figure 7 yes Figure 3 The diagram shows the structure of the end cap assembly 3000 from another angle.

[0049] The end cap assembly 3000 includes a lower insulator 100, an end cap 200, an explosion-proof valve 300, a protective plate 400, a terminal post 500, a lead 600, an upper insulator 700, and a sealing ring 800. Along the thickness direction of the end cap assembly 3000, the end cap 200 is located on one side of the lower insulator 100. Both the explosion-proof valve 300 and the protective plate 400 are mounted on the end cap 200. Along the thickness direction of the end cap assembly 3000, the terminal post 500 passes through the end cap 200 and the lower insulator 100. 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 100 opposite to the end cap 200 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 200. There are two upper insulating members 700, each installed between the terminal 500 and the end cap 200. One upper insulating member 700 serves as the positive insulating member and is installed between the positive terminal and the end cap 200. The other upper insulating member 700 serves as the negative insulating member and is installed between the negative terminal and the end cap 200. A sealing ring 800 is fitted onto the upper insulating member 700 and clamped between the end cap 200 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 200 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 200 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 200 and the negative electrode pin.

[0050] Please see Figure 8 and Figure 9 , Figure 8 yes Figure 4 The diagram shows the structure of the lower insulating component 100 in the end cap assembly 3000. Figure 9 yes Figure 8 The diagram shows the structure of the lower insulating member 100 at another angle.

[0051] The lower insulating member 100 includes a first surface 101, a second surface 102, and a peripheral surface 103. Along the thickness direction of the lower insulating member 100, the second surface 102 is disposed opposite to the first surface 101. The peripheral surface 103 connects the first surface 101 and the second surface 102. The peripheral surface 103 includes a first peripheral surface 103a and a second peripheral surface 103b. Along the width direction of the lower insulating member 100, the first peripheral surface 103a and the second peripheral surface 103b are respectively located on opposite sides of the lower insulating member 100.

[0052] The lower insulating member 100 is provided with a first skirt 110 and a second skirt 120. Both the first skirt 110 and the second skirt 120 are located on the second surface 102 and protrude from the second surface 102 in a direction away from the first surface 101. Both the first skirt 110 and the second skirt 120 are elongated, and their length directions are parallel to the length direction of the lower insulating member 100. Along the width direction of the lower insulating member 100, the first skirt 110 and the second skirt 120 are spaced apart and arranged opposite to each other. The first skirt 110 has a first outer end face 111. The first outer end face 111 is the surface of the first skirt 110 facing away from the second skirt 120 and is flush with the first circumferential surface 103a. The second skirt 120 has a second outer end face 121. The second outer end face 121 is the surface of the second skirt 120 facing away from the first skirt 110 and is flush with the second circumferential surface 103b. Along the width direction of the lower insulating member 100, the thickness of the first skirt 110 is H1, and the thickness of the second skirt 120 is H2.

[0053] The lower insulating member 100 is also provided with a first boss 130 and a second boss 140. Both the first boss 130 and the second boss 140 are located on the second surface 102 and protrude from the second surface 102 in a direction away from the first surface 101. Specifically, the first boss 130 and the second boss 140 are both located between the first skirt 110 and the second skirt 120, and are both fixedly connected between the first skirt 110 and the second skirt 120, supporting the first skirt 110 and the second skirt 120, thereby enhancing the structural strength of the first skirt 110 and the second skirt 120 in the lower insulating member 100.

[0054] Please refer to the following: Figure 10 , Figure 10 yes Figure 9 The diagram shows a partial structural diagram of the lower insulating component 100 after being cut open along DD.

[0055] In this embodiment, the first boss 130 is located in the middle of the lower insulating member 100. The first boss 130 is elongated, and its length direction is parallel to the width direction of the lower insulating member 100. The first boss 130 has a third surface 131, a first end face 132, and a second end face 133. The third surface 131 is the surface of the first boss 130 that faces away from the second surface 102, and is located on the side of the first skirt 110 and the second skirt 120 that faces away from the second surface 102. That is, the third surface 131 protrudes relative to the first skirt 110 and the second skirt 120. The third surface 131 can abut against the battery cell assembly to limit its movement, preventing the battery cell assembly from shaking and causing the tabs to tear or the core to loosen. This reduces the impact of the battery cell assembly moving along the thickness direction of the lower insulating member 1000 inside the energy storage device 1000, improving the safety performance and reliability of the energy storage device 1000. Along the length of the first boss 130, a first end face 132 and a second end face 133 are located on opposite sides of the first boss 130. The first end face 132 is the surface of the first boss 130 facing the first skirt 110 and is spaced apart from the first outer end face 111. The distance between the first end face 132 and the first outer end face 111 is L1, where 30% ≤ L1 / H1 ≤ 100%. The second end face 133 is the surface of the first boss 130 facing the second skirt 120 and is spaced apart from the second outer end face 121. The distance between the second end face 133 and the second outer end face 121 is L2, where 30% ≤ L2 / H2 ≤ 100%.

[0056] It should be noted that, since the third surface 131 protrudes relative to the first skirt 110 and the second skirt 120, the first end face 132 is spaced apart from the first outer end face 111, and the second end face 133 is spaced apart from the second outer end face 121, this not only increases the demolding force points of the lower insulating part 100 during the injection molding demolding process, making the lower insulating part 100 easier to demold, but also provides a certain deformation space for the lower insulating part 100. When thermal runaway occurs in the energy storage device 1000, the internal pressure of the energy storage device 1000 becomes too high, and the middle part of the end cap 200 deforms and arches along its width direction. The opposite ends of the end cap 200 along its width direction will squeeze the opposite ends of the lower insulating member 100 along its width direction. Since the lower insulating member 100 has a certain deformation space, the squeezing of the opposite ends of the end cap 200 along its width direction on the opposite ends of the lower insulating member 100 along its width direction can be reduced, and the lower insulating member 100 is not easily damaged. This ensures that the first protrusion 130 can better resist and restrict the battery cell assembly, improve the stability of the internal structure of the energy storage device 1000, reduce safety risks, and improve the safety performance and reliability of the energy storage device 1000. Among them, 30%≤L1 / H1≤100% and 30%≤L2 / H2≤100% can ensure that there is sufficient deformation space and exhaust channel between the first end face 132 and the first outer end face 111, and between the second end face 133 and the second outer end face 121, thereby further improving the safety performance and reliability of the energy storage device 1000.

[0057] Please continue reading. Figure 9 and Figure 11 , Figure 11 yes Figure 9 A magnified schematic diagram of a portion of region b in the lower insulating member 100 is shown.

[0058] Along the length of the lower insulating member 100, the second boss 140 is located on one side of the first boss 130 and is spaced apart from the first boss 130. The second boss 140 is elongated, and its length direction is parallel to the width direction of the lower insulating member 100. The second boss 140 has a fourth surface 141, a third end face 142, and a fourth end face 143. The fourth surface 141 is the surface of the second boss 140 that faces away from the second surface 102, and is located on the side of the first skirt 110 and the second skirt 120 that faces away from the second surface 102. That is, the fourth surface 141 protrudes relative to the first skirt 110 and the second skirt 120. The fourth surface 141 abuts against the battery cell assembly to further limit its movement, preventing the battery cell assembly from shaking and causing the tabs to tear or the core to loosen. This reduces the impact of the battery cell assembly moving along the thickness direction of the lower insulation member 100 inside the energy storage device 1000, improving the safety and reliability of the energy storage device 1000. Along the length of the second protrusion 140, the third end face 142 is the surface of the second protrusion 140 facing the first skirt 110, and is spaced apart from the first outer end face 111. The distance between the third end face 142 and the first outer end face 111 is L3, where 30% ≤ L3 / H1 ≤ 100%. The fourth end face 143 is the surface of the second protrusion 140 facing the second skirt 120, and is spaced apart from the second outer end face 121. The distance between the fourth end face 143 and the second outer end face 121 is L4, where 30% ≤ L4 / H2 ≤ 100%. In this embodiment, there are two second protrusions 140. Along the length of the lower insulating member 100, two second protrusions 140 are located on opposite sides of the first protrusion 130.

[0059] It should be noted that, since the fourth surface 141 protrudes relative to the first skirt 110 and the second skirt 120, the third end face 142 is spaced apart from the first outer end face 111, and the fourth end face 143 is spaced apart from the second outer end face 121, this not only further increases the demolding force points of the lower insulating component 100 during the injection molding demolding process, making the lower insulating component 100 easier to demold, but also provides further deformation space for the lower insulating component 100. This can further reduce the pressure of the end cap 200 on the lower insulating component 100 when the energy storage device 1000 experiences thermal runaway, preventing the end cap 200 from deforming and arching and squeezing the lower insulating component 100. The lower insulating component 100 is less likely to be damaged, thereby ensuring that the second protrusion 140 can better press and restrict the battery cell assembly, improving the stability of the internal structure of the energy storage device 1000, reducing safety risks, and improving the safety performance and reliability of the energy storage device 1000. Among them, 30%≤L3 / H1≤100% and 30%≤L4 / H2≤100% can ensure that there is sufficient deformation space and exhaust channel between the third end face 142 and the first outer end face 111, and between the fourth end face 143 and the second outer end face 121, thereby further improving the safety performance and reliability of the energy storage device 1000.

[0060] Each second boss 140 is provided with a through hole 145. The through hole 145 extends through the second boss 140 along the length of the lower insulating member 100. There are multiple through holes 145, which are spaced apart along the length of the second boss 140, so that the airflow at the pins 600 on both sides can flow through the through holes 145 to the area in the lower insulating member 100 corresponding to the explosion-proof valve 300, ensuring 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.

[0061] Please continue reading. Figure 8 and Figure 9 The lower insulating component 100 is also provided with a groove 150, a second vent 170, a first vent 180, a third vent 190, and a first pole hole 195. The groove 150, the second vent 170, the first vent 180, the third vent 190, and the first pole hole 195 are all spaced apart from the peripheral side surface 103.

[0062] The opening of the groove 150 is located on the first surface 101. The groove 150 is recessed from the first surface 101 toward the third surface 131. The groove 150 is correspondingly disposed with the first boss 130. It should be noted that the corresponding disposal of the groove 150 with the first boss 130 means that the orthographic projection of the first boss 130 on the first surface 101 covers the opening of the groove 150. The groove 150 includes a bottom wall surface 151, a first side wall surface 152, and a second side wall surface 153. The bottom wall surface 151 is disposed opposite to the opening of the groove 150 and opposite to the third surface 131. Along the length of the lower insulating member 100, the first side wall surface 152 and the second side wall surface 153 are disposed opposite to each other and are respectively connected to the opposite sides of the bottom wall surface 151.

[0063] The second vent 170, the first vent 180, the third vent 190, and the first pole hole 195 all penetrate the lower insulating member 100 along its thickness direction. The second vent 170 is located on the first boss 130 and penetrates the third surface 131 and the bottom wall 151 of the groove. The second vent 170 is elongated, and its length direction is parallel to the length direction of the lower insulating member 100, thus resisting deformation of the lower insulating member 100 along its length direction and increasing its structural stability. There are multiple second vents 170, spaced apart from each other. Specifically, multiple second vents 170 are arranged at intervals along the length direction of the first boss 130.

[0064] The first vent 180, the third vent 190, and the first pole hole 195 all penetrate the first surface 101 and the second surface 102. Along the length of the lower insulating member 100, the first vent 180 is located in the middle of the lower insulating member 100 and is spaced apart from the first boss 130. The length direction of the first vent 180 is perpendicular to the length direction of the second vent 170, which can improve the stress distribution of the lower insulating member 100, reduce stress concentration, and thus improve the strength and stability of the lower insulating member 100 structure. There are multiple first vent holes 180, which are spaced apart from each other. Some of the first vent holes 180 are located on one side of the first boss 130, while others are located on the other side. For example, the first vent 180 is elongated, and the length direction of the first vent 180 is parallel to the width direction of the lower insulating member 100, which can resist the deformation of the lower insulating member 100 along its width direction and increase the structural stability of the lower insulating member 100.

[0065] The third vent 190 is located on one side of the first vent 180 and is spaced apart from the first vent 180. In this embodiment, there are multiple third vents 190, which are spaced apart from each other. Along the length of the lower insulating member 100, a portion of the third vents 190 are located between a second boss 140 and the first vent 180, and are spaced apart from both the second boss 140 and the first vent 180. Another portion of the third vents 190 are located between another second boss 140 and the first vent 180, and are spaced apart from both the second boss 140 and the first vent 180.

[0066] Please continue reading. Figure 6 , Figure 6 The middle arrow indicates the direction of gas flow inside the energy storage device 1000.

[0067] When the energy storage device 1000 experiences thermal runaway, the end cap 200 undergoes slight deformation, creating a gap between the lower insulating component 100 and the end cap 200. The high-temperature, high-pressure airflow generated inside the energy storage device 1000 rapidly enters the gap between the lower insulating component 100 and the end cap 200 through a three-dimensional air passage constructed by the through hole 145, the second vent hole 170, the groove 150, the first vent hole 180, and the third vent hole 190, thereby reaching the area below the explosion-proof valve 300. The explosion-proof valve 300 then promptly releases pressure, improving the exhaust performance and reliability of the energy storage device 1000.

[0068] The first electrode hole 195 is located on the side of the second protrusion 140 away from the first protrusion 130, and is spaced apart from the second protrusion 140. The distance between the first electrode hole 195 and the second protrusion 140 is less than the distance between the second protrusion 140 and the first protrusion 130. That is, the second protrusion 140 is located close to the first electrode hole 195. There are two first electrode holes 195, which are spaced apart. Along the length of the lower insulating member 100, one first electrode hole 195 is located on the side of one second protrusion 140 away from the first protrusion 130 for the positive electrode to pass through, and the other first electrode hole 195 is located on the side of another second protrusion 140 away from the first protrusion 130 for the negative electrode to pass through.

[0069] The lower insulating member 100 is also provided with reinforcing ribs Q. The reinforcing ribs Q are located on the bottom wall surface 151 of the groove and connect between the first groove side wall surface 152 and the second groove side wall surface 153, and are spaced apart from the second vent holes 170. In this embodiment, the length direction of the reinforcing ribs Q is parallel to the length direction of the lower insulating member 100. Multiple reinforcing ribs Q are arranged at intervals along the width direction of the lower insulating member 100. Each reinforcing rib Q is located between two adjacent second vent holes 170 and is spaced apart from both adjacent second vent holes 170, ensuring that the reinforcing ribs Q do not affect the exhaust performance of the second vent holes 170. For example, multiple reinforcing ribs Q are arranged in parallel. The provision of reinforcing ribs Q can enhance the structural strength of the first boss 130, ensuring that the first boss 130 can better resist and restrict the battery cell assembly, thereby improving the stability of the internal structure of the energy storage device 1000, reducing safety risks, and improving the safety performance and reliability of the energy storage device 1000.

[0070] Please continue reading. Figure 4 The end cap 200 can be a smooth aluminum sheet made of aluminum. The end cap 200 is located on the side of the first surface 101 opposite to the second surface 102. The end cap 200 is provided with an explosion-proof hole 210 and a second pole hole 220. Both the explosion-proof hole 210 and the second pole hole 220 penetrate the end cap 200 along its thickness direction. Specifically, along the length direction of the end cap 200, the explosion-proof hole 210 is located in the middle of the end cap 200. The explosion-proof hole 210 is correspondingly provided with the first vent hole 180 and the first boss 130, that is, the orthogonal projection of the explosion-proof hole 210 on the lower insulating member 100 will cover at least a portion of the first vent hole 180 and at least a portion of the first boss 130.

[0071] The second electrode post hole 220 is located on one side of the explosion-proof hole 210 and is spaced apart from the explosion-proof hole 210, and communicates with the first electrode post hole 195. There are two second electrode post holes 220. Along the length of the end cap 200, the two second electrode post holes 220 are located on opposite sides of the explosion-proof hole 210, allowing the electrode post 500 to pass through. Specifically, one second electrode post hole 220 communicates with one first electrode post hole 195 for the positive electrode post to pass through, and the other second electrode post hole 220 communicates with the other first electrode post hole 195 for the negative electrode post to pass through.

[0072] Please continue reading. Figure 5The explosion-proof valve 300 is correspondingly disposed with both the first vent 180 and the first boss 130, and covers the opening of the explosion-proof hole 210 facing the first surface 101. It should be noted that the corresponding disposal of the explosion-proof valve 300 with both the first vent 180 and the first boss 130 means that the orthogonal projection of the explosion-proof valve 300 on the lower insulating member 100 will cover at least a portion of the first vent 180 and at least a portion of the first boss 130. The protective plate 400 covers the opening of the explosion-proof hole 210 away from the first surface 101 and protects the explosion-proof valve 300.

[0073] Please continue to refer to this. Figure 6 Along the thickness direction of the end cap assembly 3000, each pole post 500 passes through a second pole post hole 220 and a first pole post hole 195. Each pin 600 is located on the side of the second surface 102 away from the first surface 101 and on the side of a second boss 140 away from the explosion-proof valve 300, and is sleeved on a pole post 500. Each upper insulating member 700 is disposed around a pole post 500 and passes through a second pole post hole 220 and a first pole post hole 195. Each sealing ring 800 is sleeved on an upper insulating member 700 and passes through a first pole post hole 195, and is clamped between the end cap 200 and the surface of a pin 600 near the lower insulating member 100. This not only seals the gap between the end cap 200 and the lower insulating member 100, ensuring good airtightness of the end cap assembly 3000, but also insulates the end cap 200 and the pin 600.

[0074] Please continue reading. Figure 2 The Mylar membrane 4000 is thermally fused to the first outer end face 111 and the second outer end face 121 to isolate the housing 2000 and the cell assembly. It should be noted that since the first end face 132 and the third end face 142 are spaced apart from the first outer end face 111, and the second end face 133 and the fourth end face 143 are spaced apart from the second outer end face 121, this ensures that the Mylar membrane 4000 is spaced apart from the first protrusion 130 and the second protrusion 140. This increases the venting channels between the Mylar membrane 4000 and the lower insulating member 100, which is beneficial for improving the venting performance of the energy storage device 1000, thereby enhancing the safety performance and reliability of the energy storage device 1000.

[0075] The energy storage device 1000 provided in this application, by setting a third surface 131 that protrudes relative to the first skirt 110 and the second skirt 120, a first end face 132 and a first outer end face 111 that are spaced apart, and a second end face 133 and a second outer end face 121 that are spaced apart, can not only increase the demolding force points of the lower insulating part 100 during the injection molding demolding process, making the lower insulating part 100 easier to demold, but also provide a certain deformation space for the lower insulating part 100. When thermal runaway occurs in the energy storage device 1000, the internal pressure of the energy storage device 1000 becomes too high, and the middle part of the end cover 200 deforms and arches along its width direction. The opposite ends of the end cover 200 along its width direction will squeeze the opposite ends of the lower insulating component along its width direction. Since the lower insulating component 100 has a certain deformation space, the squeezing of the opposite ends of the end cover 200 along its width direction on the opposite ends of the lower insulating component 100 along its width direction can be reduced, and the lower insulating component 100 is not easily damaged. As a result, the first protrusion 130 and the second protrusion 140 can better resist and restrict the battery cell assembly, improve the stability of the internal structure of the energy storage device 1000, reduce safety risks, and improve the safety performance and reliability of the energy storage device 1000.

[0076] Furthermore, the first boss 130 and the second boss 140 are both connected to the first skirt 110 and the second skirt 120, which allows the first boss 130 and the second boss 140 to be supported between the first skirt 110 and the second skirt 120, thereby enhancing the structural strength of the first skirt 110 and the second skirt 120. This ensures that the lower insulating member 100 has sufficient deformation space, and that the first boss 130 and the second boss 140 have sufficient extension length to fully abut against the cell assembly, thereby limiting the displacement of the cell assembly and further improving the stability of the internal structure of the energy storage device 1000.

[0077] 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.

[0078] 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. A lower insulating element for use in an energy storage device, characterized in that, The lower insulating member has a first surface and a second surface, and the second surface and the first surface are disposed opposite to each other along the thickness direction of the lower insulating member; The lower insulating member is provided with a first skirt, a second skirt, and a first boss. The first skirt, the second skirt, and the first boss are all located on the second surface. Along the width direction of the lower insulating member, the first skirt and the second skirt are spaced apart and arranged opposite to each other. The first skirt has a first outer end face away from the second skirt, and the second skirt has a second outer end face away from the first skirt. The first boss is located between the first skirt and the second skirt. The first boss has a third surface, a first end face, and a second end face. The third surface is the surface of the first boss away from the second surface and is located on the side of the first skirt and the second skirt away from the second surface, and is used to abut against the cell assembly of the energy storage device. The first end face is the surface of the first boss facing the first skirt and is spaced apart from the first outer end face. The second end face is the surface of the first boss facing the second skirt and is spaced apart from the second outer end face.

2. The lower insulating member according to claim 1, characterized in that, Along the width direction of the lower insulating member, the thickness of the first skirt is H1, the thickness of the second skirt is H2, the distance between the first end face and the first outer end face is L1, and the distance between the second end face and the second outer end face is L2, wherein 30%≤L1 / H1≤100% and 30%≤L2 / H2≤100%.

3. The lower insulating member according to claim 1, characterized in that, The first boss is connected between the first skirt edge and the second skirt edge.

4. The lower insulating member according to any one of claims 1 to 3, characterized in that, The lower insulating member is provided with a first pole hole, which penetrates the first surface and the second surface; The lower insulating member is further provided with a second protrusion, which is disposed on the second surface and located between the first protrusion and the first electrode hole, and is spaced apart from both the first protrusion and the first electrode hole. The second protrusion includes a fourth surface, a third end face, and a fourth end face. The fourth surface is the surface of the second protrusion facing away from the second surface and is located on the side of the first skirt and the second skirt facing away from the second surface, and is used to abut against the cell assembly of the energy storage device. The third end face is the surface of the second protrusion facing the first skirt and is spaced apart from the first outer end face. The fourth end face is the surface of the second protrusion facing the second skirt and is spaced apart from the second outer end face.

5. The lower insulating member according to claim 4, characterized in that, Along the width direction of the lower insulating member, the thickness of the first skirt is H1, the thickness of the second skirt is H2, the distance between the third end face and the first outer end face is L3, and the distance between the fourth end face and the second outer end face is L4, wherein 30%≤L3 / H1≤100% and 30%≤L4 / H2≤100%.

6. The lower insulating member according to claim 4, characterized in that, The second boss is connected between the first skirt edge and the second skirt edge.

7. The lower insulating member according to claim 4, characterized in that, The second boss is provided with a through hole, which extends through the second boss along the length of the lower insulating member.

8. The lower insulating member according to any one of claims 1 to 3, characterized in that, The lower insulating member is also provided with a plurality of first vent holes, which all penetrate the first surface and the second surface and are spaced apart from each other along the length of the lower insulating member. A portion of the first vent holes are located on one side of the first boss, and another portion of the first vent holes are located on the other side of the first boss.

9. The lower insulating member according to claim 8, characterized in that, The length direction of the first vent hole is parallel to the width direction of the lower insulating member.

10. The lower insulating member according to claim 8, characterized in that, The lower insulating component is further provided with a groove and a second vent hole. The opening of the groove is located on the first surface. The groove is corresponding to the first boss. The groove has a bottom wall surface, and the bottom wall surface is opposite to the opening of the groove. The second vent hole penetrates the third surface and the bottom wall of the groove.

11. The lower insulating member according to claim 10, characterized in that, The length direction of the second vent is perpendicular to the length direction of the first vent.

12. The lower insulating member according to claim 10 or 11, characterized in that, There are multiple second vent holes, which are arranged at intervals along the width direction of the lower insulating member.

13. The lower insulating member according to claim 12, characterized in that, The groove also has a first groove sidewall and a second groove sidewall. Along the length of the lower insulating member, the first groove sidewall and the second groove sidewall are arranged opposite to each other and are respectively connected to opposite sides of the bottom wall of the groove. The lower insulating component is also provided with reinforcing ribs, which are disposed on the bottom wall of the groove and connected between the first groove side wall and the second groove side wall, and are spaced apart from the second vent hole.

14. The lower insulating member according to claim 13, characterized in that, There are multiple reinforcing ribs, which are arranged at intervals along the width direction of the lower insulating member, with each reinforcing rib located between two adjacent second vent holes.

15. The lower insulating member according to claim 8, characterized in that, The lower insulating member is also provided with a plurality of third vent holes, which all penetrate the first surface and the second surface and are spaced apart from each other. Along the length of the lower insulating member, a portion of the third vent holes are located on one side of the first vent hole, and another portion of the third vent holes are located on the other side of the first vent hole.

16. An end cap assembly, characterized in that, The device includes a lower insulating member, an end cap, and an explosion-proof valve as described in any one of claims 1 to 15. The end cap is located on the side of the first surface away from the second surface. The end cap is provided with an explosion-proof hole that penetrates the end cap along its thickness direction and is corresponding to the first boss. The explosion-proof valve is installed on the end cap and covers the explosion-proof hole.

17. An energy storage device, characterized in that, The energy storage device includes a housing, a battery cell assembly, and an end cap assembly as described in claim 16. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing, and 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 and closes the opening, and is electrically connected to the cell assembly, with the third surface abutting against the cell assembly.

18. The energy storage device according to claim 17, characterized in that, The energy storage device also includes a Mylar membrane, which is housed in the housing cavity and located between the housing and the battery cell assembly, and is thermally fused to the first outer end face and the second outer end face.

19. An electrical appliance, characterized in that, Includes the energy storage device as described in claim 17 or 18, the energy storage device being used to supply power to the electrical equipment.

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