Lower insulating part, end cover assembly, energy storage device and electric equipment

Abstract

According to the lower insulating part, the end cover assembly, the energy storage device and the electric equipment, the risk that the energy storage device is on fire is reduced, and the safety performance of the energy storage device is improved. The lower insulating part comprises a first surface and a second surface, and the second surface and the first surface are arranged oppositely; the lower insulating part is provided with a boss, the boss is arranged on the second surface and abuts against the battery cell assembly, and the boss comprises a boss surface deviating from the second surface; the lower insulating part is further provided with a first groove and a first through hole, an opening of the first groove is located in the first surface, the first groove is recessed from the first surface to the boss, the first groove comprises a first groove bottom wall surface, the first groove bottom wall surface and the boss surface are oppositely arranged, and the first through hole penetrates through the first groove bottom wall surface and the boss surface; the lower insulating part is further provided with a protective cover, the protective cover covers the first through hole and comprises a baffle and a side plate, the baffle covers the first through hole, and the side plate surrounds the first through hole and is connected between the baffle and the first groove bottom wall face.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a lower insulating piece, an end cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] With the increasingly wide application of the energy storage device, the safety performance of the energy storage device is concerned. A large amount of flammable gas is generated in the process of application of the energy storage device. When the internal pressure of the energy storage device reaches a certain value, the flammable gas is sprayed out from the explosion-proof valve of the energy storage device. At the same time, the positive and negative short circuit inside the energy storage device will cause the sparking phenomenon, thereby generating sparks. When the sparks are sprayed out of the explosion-proof valve together with the gas, the sparks will cause the energy storage device to catch fire under the condition of sufficient external oxygen, thereby causing great safety hazard. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a lower insulating piece, an end cover assembly, an energy storage device and an electric equipment, which reduces the risk of fire of the energy storage device and improves the safety performance of the energy storage device.

[0004] The present application provides a lower insulating piece used in an end cover assembly, which comprises a first surface and a second surface, the second surface being arranged opposite to the first surface along the thickness direction of the lower insulating piece.

[0005] The lower insulating piece is provided with a boss, the boss being arranged on the second surface and protruding away from the first surface, the boss comprising a boss surface facing away from the second surface.

[0006] The lower insulating piece is further provided with a first recess and a first through hole, the opening of the first recess being located on the first surface, the first recess being recessed from the first surface to the boss, the first recess comprising a first groove bottom wall surface, the first groove bottom wall surface being arranged opposite to the opening of the first recess and opposite to the boss surface, the first through hole penetrating through the first groove bottom wall surface and the boss surface.

[0007] The lower insulating piece is further provided with a protective cover, the protective cover being arranged on the first groove bottom wall surface and covering the first through hole, the protective cover comprising a baffle and a side plate, the baffle being located on the side of the first groove bottom wall surface away from the boss surface and covering the first through hole, the side plate being arranged around the opening of the first groove bottom wall surface of the first through hole and connected between the baffle and the first groove bottom wall surface.

[0008] The side plate is provided with a second through hole, the second through hole penetrating through the side plate along the thickness direction of the side plate and communicating with the first through hole.

[0009] The second through holes are arranged in plurality and are arranged at intervals, and two of the second through holes are arranged oppositely along the width direction of the lower insulation piece.

[0010] The first through holes and the protective covers are arranged in plurality, the first through holes are arranged at intervals, the protective covers are arranged at intervals, and each protective cover covers a first through hole.

[0011] The first recess includes two first side wall surfaces arranged oppositely along the width direction of the lower insulation piece and connected to opposite sides of the first groove bottom wall surface.

[0012] The lower insulation piece is further provided with a protrusion arranged on the first groove bottom wall surface and arranged at intervals from the two first side wall surfaces, and the protrusion is arranged correspondingly to the explosion-proof valve of the end cover assembly.

[0013] The protrusion is arranged at intervals from the first through holes, and part of the first through holes are arranged between one first side wall surface and the protrusion, and the other part of the first through holes are arranged between the other first side wall surface and the protrusion.

[0014] The protrusion further includes a first side surface and a second side surface arranged oppositely along the length direction of the lower insulation piece and connected between the protrusion surface and the second surface.

[0015] The protrusion is arranged between the two first side wall surfaces, and the protrusion includes a protrusion surface facing away from the first groove bottom wall surface.

[0016] The lower insulation piece is further provided with a second recess, an opening of the second recess is arranged on the protrusion surface, the second recess is recessed from the protrusion surface to the protrusion surface, and penetrates the first side surface and the second side surface, the second recess includes a second groove bottom wall surface arranged oppositely to the opening of the second recess and oppositely to the protrusion surface.

[0017] The lower insulation piece is provided with a gas permeable hole penetrating the second groove bottom wall surface and the protrusion surface.

[0018] The protrusion further includes two protrusion side surfaces arranged oppositely along the width direction of the lower insulation piece and connected between the protrusion surface and the first groove bottom wall surface, and each protrusion side surface is arranged oppositely to one first side wall surface.

[0019] The second groove comprises two second groove side wall surfaces, which are oppositely arranged along the width direction of the lower insulating piece, and are connected between the second groove bottom wall surface and the boss surface, and are oppositely arranged with the two protruding side surfaces, respectively.

[0020] The distance between each second groove side wall surface and the oppositely arranged protruding side surface is w, and 1.3mm≤w≤2.5mm.

[0021] The explosion-proof valve is mounted on the end cover, and covers the explosion-proof hole.

[0022] Along the width direction of the end cover assembly, the first through hole is located on one side of the explosion-proof valve.

[0023] The application further provides an energy storage device, which comprises a shell, an electric core assembly and the above-mentioned end cover assembly.

[0024] The application further provides an electric equipment, which comprises the above-mentioned energy storage device, and the energy storage device is used for supplying power for the electric equipment.

[0025] The energy storage device provided by the application can prevent the spark from reaching the lower side of the explosion-proof valve and being sprayed out with the explosion-proof valve opening, thereby reducing the risk of fire and explosion caused by the spark outside the energy storage device, and improving the safety performance of the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used by the embodiments of the application will be described below.

[0027] Figure 1 is a structure schematic diagram of the energy storage device provided by the embodiments of the application;

[0028] Figure 2 is Figure 1 is a structure schematic diagram of the end cover assembly of the energy storage device shown in the figure;

[0029] Figure 3 isFigure 2 exploded structural schematic view of the end cover assembly shown in FIG. 1;

[0030] Figure 4 Figure 2 structural schematic view of the end cover assembly shown in FIG. 1 along A-A;

[0031] Figure 5 Figure 3 structural schematic view of the lower insulating piece in the end cover assembly shown in FIG. 1;

[0032] Figure 6 Figure 5 structural schematic view of the lower insulating piece shown in FIG. 1 from another angle;

[0033] Figure 7 Figure 5 structural schematic view of the lower insulating piece shown in FIG. 1 along B-B.

[0034] The figure legend: energy storage device 1000, housing 2000, end cover assembly 3000, opening 2001, lower insulating piece 100, end cover 200, explosion-proof valve 300, protective sheet 400, pole 500, connecting sheet 600, upper insulating piece 700, sealing ring 800, first surface 101, second surface 102, first circumferential side 103, boss 110, boss surface 111, second circumferential side 112, first side 112a, second side 112b, third side 112c, fourth side 112d, first groove 120, first groove bottom wall surface 121, first groove side wall surface 122, first side wall surface 122a, second side wall surface 122b, protrusion 10, protrusion surface 11, protrusion side 12, second groove 130, first through hole 170, second groove bottom wall surface 131, second groove side wall surface 132, air hole 140, first pole hole 150, first liquid injection hole 160, protective cover 180, baffle 181, side plate 182, second through hole 183, third surface 201, fourth surface 202, third circumferential side 203, explosion-proof hole 210, second pole hole 220, second liquid injection hole 230. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] Please refer to Figure 1 , Figure 1 is the structural schematic view of the energy storage device 1000 provided by the embodiments of the present application. ​​​​

[0037] The present application provides an energy storage device 1000, which can include but is not limited to a single battery, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device provided by the embodiments of the present application can be but is not limited to the listed products, and can also be other application forms. The embodiments of the present application do not strictly limit the application form of the energy storage device 1000. The embodiments of the present application take the square battery as an example for description.

[0038] The energy storage device 1000 includes a shell 2000, a battery cell assembly (not shown in the figure) and an end cover assembly 3000. The shell 2000 is provided with a receiving cavity (not shown in the figure) and an opening 2001. The receiving cavity is located on the inner side of the shell 2000 and contains electrolyte. The opening 2001 is located on the top side of the receiving cavity and communicates with 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 received in the receiving cavity. The battery cell assembly can be soaked in the electrolyte. The end cover assembly 3000 is installed on the shell 2000 and seals the opening 2001, and is electrically connected with the battery cell assembly.

[0039] Please refer to Figures 2 to 4 , Figure 2 is a structural schematic diagram of the end cover assembly 3000 of the energy storage device 1000 shown in Figure 1 is an exploded structural schematic diagram of the end cover assembly 3000 shown in Figure 3 is a structural schematic diagram of the end cover assembly 3000 shown in Figure 2 is a structural schematic diagram of the end cover assembly 3000 shown in Figure 4 is a structural schematic diagram of the end cover assembly 3000 shown in Figure 2 is a structural schematic diagram of the end cover assembly 3000 shown in

[0040] The end cover assembly 3000 comprises the lower insulating piece 100, the end cover 200, the explosion-proof valve 300, the protective sheet 400, the pole 500, the connecting sheet 600, the upper insulating piece 700, and the sealing ring 800. Along the thickness direction of the end cover assembly 3000, the end cover 200 is located on one side of the lower insulating piece 100. The explosion-proof valve 300 and the protective sheet 400 are both mounted on the end cover 200. Along the thickness direction of the end cover assembly 3000, the pole 500 penetrates through the end cover 200 and the lower insulating piece 100. Among them, the pole 500 has two, and the two poles 500 are arranged at intervals along the length direction of the end cover assembly 3000. One pole 500 serves as a positive pole, and the other pole 500 serves as a negative pole. The connecting sheet 600 is located on the side of the lower insulating piece 100 away from the end cover 200, and is electrically connected with the pole 500 and the tab of the battery cell assembly. Among them, the connecting sheet 600 has two, and each connecting sheet 600 is fixedly connected with one pole 500. One connecting sheet 600 serves as a positive connecting sheet, and is electrically connected with the positive pole and the positive tab of the battery cell assembly. The other connecting sheet 600 serves as a negative connecting sheet, and is electrically connected with the negative pole and the negative tab of the battery cell assembly. The upper insulating piece 700 is mounted between the pole 500 and the end cover 200. Among them, the upper insulating piece 700 has two, and each upper insulating piece 700 is mounted between one pole 500 and the end cover 200. One upper insulating piece 700 serves as a positive insulating piece, and is mounted between the positive pole and the end cover 200. The other upper insulating piece 700 serves as a negative insulating piece, and is mounted between the negative pole and the end cover 200. The sealing ring 800 is sleeved on the upper insulating piece 700, and is clamped between the end cover 200 and the pole 500. Among them, the sealing ring 800 has two, and each sealing ring 800 is sleeved on one upper insulating piece 700, and is clamped between the end cover 200 and one pole 500. One sealing ring 800 serves as a positive sealing ring, and is sleeved on the positive insulating piece, and is clamped between the end cover 200 and the positive pole. The other sealing ring 800 serves as a negative sealing ring, and is sleeved on the negative insulating piece, and is clamped between the end cover 200 and the negative pole.

[0041] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 3 the structure diagram of the lower insulating piece 100 in the end cover assembly 3000 shown in FIG. 1, Figure 6 is Figure 5 the structure diagram of the lower insulating piece 100 shown in FIG. 2 from another angle.

[0042] The lower insulating piece 100 comprises a first surface 101, a second surface 102, and a first peripheral side 103. Along the thickness direction of the lower insulating piece 100, the second surface 102 is arranged opposite to the first surface 101. The first peripheral side 103 is connected between the first surface 101 and the second surface 102.

[0043] The lower insulating member 100 is provided with a boss 110. The boss 110 is located in the middle of the lower insulating member 100 along the length direction of the lower insulating member 100. The boss 110 is provided on the second surface 102 and protrudes away from the first surface 101, and abuts against the cell assembly. For example, the boss 110 is rectangular, the length direction of the boss 110 is parallel to the width direction of the lower insulating member 100, and the width direction of the boss 110 is parallel to the length direction of the lower insulating member 100.

[0044] When the energy storage device 1000 is in thermal runaway, the lower insulating member 100 can abut against the cell assembly to limit the movement of the cell assembly towards the end cover assembly 3000, avoid short circuit between the cell assembly and the end cover assembly 3000, and improve the safety performance of the energy storage device 1000.

[0045] The boss 110 includes a boss surface 111 away from the second surface 102 and a second peripheral side 112. The boss surface 111 is located on the side of the second surface 102 away from the first surface 101, and is spaced apart from the second surface 102. The second peripheral side 112 is arranged around the boss surface 111 and connected between the boss surface 111 and the second surface 102. In this embodiment, the second peripheral side 112 includes a first side 112a, a second side 112b, a third side 112c and a fourth side 112d. Along the length direction of the lower insulating member 100, the first side 112a and the second side 112b are arranged opposite to each other and connected between the boss surface 111 and the second surface 102. Along the width direction of the lower insulating member 100, the third side 112c and the fourth side 112d are arranged opposite to each other and connected between the first side 112a and the second side 112b. The third side 112c and the fourth side 112d are flush with the first peripheral side 103.

[0046] The lower insulating member 100 is provided with a first recess 120. The first recess 120 is located in the middle of the lower insulating member 100 along the length direction of the lower insulating member 100, and is spaced apart from the first peripheral side 103. The opening of the first recess 120 is located on the first surface 101. The first recess 120 is recessed from the first surface 101 to the boss 110. The first recess 120 is arranged opposite to the boss 110. It should be noted that the first recess 120 is arranged opposite to the boss 110, which means that the orthographic projection of the first recess 120 on the boss 110 at least partially covers the boss 110.

[0047] The first groove 120 comprises a first groove bottom wall surface 121 and a first groove side wall surface 122. The first groove bottom wall surface 121 is arranged opposite to the opening of the first groove 120 and opposite to the boss surface 111. The first groove side wall surface 122 is arranged around the first groove bottom wall surface 121 and connected between the first groove bottom wall surface 121 and the first surface 101. The first groove side wall surface 122 comprises two first side wall surfaces 122a and two second side wall surfaces 122b. The two first side wall surfaces 122a are arranged opposite to each other along the width direction of the lower insulation piece 100 and connected to opposite sides of the first groove bottom wall surface 121. The two second side wall surfaces 122b are arranged opposite to each other along the length direction of the lower insulation piece 100 and connected between the two first side wall surfaces 122a.

[0048] In addition, the lower insulation piece 100 is provided with a protrusion 10. The protrusion 10 is located between the first surface 101 and the first groove bottom wall surface 121, so that the protrusion 10 does not protrude relative to the first surface 101, facilitating stable assembly between the lower insulation piece 100 and the end cover 200, thereby making the end cover assembly 3000 have good assembly stability. The protrusion 10 is arranged on the first groove bottom wall surface 121 and protrudes from the first groove bottom wall surface 121 to the first surface 101, which can enhance the strength of the lower insulation piece 100. Specifically, the protrusion 10 is located between the two first side wall surfaces 122a and is spaced apart from the two first side wall surfaces 122a and connected to the two second side wall surfaces 122b. The protrusion 10 comprises a protrusion surface 11 facing away from the first groove bottom wall surface 121 and two protrusion side surfaces 12. The protrusion surface 11 is located between the first groove bottom wall surface 121 and the first surface 101 and connected between the two second side wall surfaces 122b. The two protrusion side surfaces 12 are arranged opposite to each other along the width direction of the lower insulation piece 100 and connected between the protrusion surface 11 and the first groove bottom wall surface 121. Each protrusion side surface 12 is arranged opposite to one first side wall surface 122a.

[0049] The lower insulation piece 100 is further provided with a second groove 130, a ventilation hole 140, a first pole hole 150, a first liquid injection hole 160 and a first through hole 170. The second groove 130 is located in the middle of the lower insulation piece 100 and arranged opposite to the protrusion 10 along the width direction of the lower insulation piece 100. The opening of the second groove 130 is arranged on the boss surface 111. The second groove 130 is recessed from the boss surface 111 to the protrusion surface 11 and penetrates the second circumferential side surface 112. The second groove 130 penetrates the first side surface 112a and the second side surface 112b.

[0050] The second groove 130 comprises a second groove bottom wall surface 131 and two second groove side wall surfaces 132. The second groove bottom wall surface 131 is arranged opposite to the opening of the second groove 130, and is located between the first groove bottom wall surface 121 and the boss surface 111, and is spaced apart from the first groove bottom wall surface 121 and the boss surface 111. The two second groove side wall surfaces 132 are arranged opposite to each other along the width direction of the lower insulation piece 100, and are connected between the second groove bottom wall surface 131 and the boss surface 111. Specifically, the two second groove side wall surfaces 132 are located between the two protruding side surfaces 12, and are spaced apart from the two protruding side surfaces 12. The distance between each second groove side wall surface 132 and the opposite protruding side surface 12 is w, and 1.3 mm≤w≤2.5 mm, so as to ensure that the lower insulation piece 100 has a certain strength, avoid deformation of the lower insulation piece 100 when the energy storage device 1000 is in thermal runaway, and prevent the protrusions 10 in the boss 110 from being blown out by high-temperature and high-pressure gas. At the same time, the distance between the second groove side wall surface 132 and the protruding side surface 12 should not be too large, so as to avoid occupying too much space and affecting the exhaust performance of the energy storage device 1000, thereby improving the safety performance of the energy storage device 1000. For example, the optimal value of w is 2 mm.

[0051] The gas permeable hole 140 is arranged in the boss 110 and penetrates the boss 110 along the thickness direction of the lower insulation piece 100. Specifically, the gas permeable hole 140 penetrates the second groove bottom wall surface 131 and the protruding surface 11. The gas permeable hole 140 is located between the two second side wall surfaces 122b and is spaced apart from the two second side wall surfaces 122b, and is located between the two second groove side wall surfaces 132 and is spaced apart from the two second groove side wall surfaces 132. The gas permeable hole 140 has a plurality of gas permeable holes 140, and the plurality of gas permeable holes 140 are spaced apart.

[0052] Along the length direction of the lower insulation piece 100, the first pole column hole 150 and the first liquid injection hole 160 are located on one side of the first groove 120 and are spaced apart from the first groove 120, and both penetrate the lower insulation piece 100 along the thickness direction of the lower insulation piece 100. Along the length direction of the lower insulation piece 100, the first pole column hole 150 is located on one side of the boss 110 and is spaced apart from the boss 110, so as to pass through the pole column 500. The first pole column hole 150 has two first pole column holes 150. Along the length direction of the lower insulation piece 100, the two first pole column holes 150 are located on opposite sides of the boss 110. The first liquid injection hole 160 is located between the boss 110 and one first pole column hole 150, and is spaced apart from the boss 110 and the first pole column hole 150.

[0053] Please refer to Figure 7 , Figure 7 is Figure 5 the structure schematic diagram of the lower insulation piece 100 along B-B is shown.

[0054] The first through hole 170 is arranged on the boss 110 and penetrates the first groove bottom wall surface 121 and the boss surface 111, and is arranged in a spaced manner with the first groove side wall surface 122 and the protrusion side surface 12. The first through hole 170 is in a plurality, and the plurality of first through holes 170 are arranged in a spaced manner. Along the width direction of the end cover assembly 3000, part of the first through holes 170 are located between one first side wall surface 122a and the protrusion 10 and are located on one side of the explosion-proof valve 300, and the other part of the first through holes 170 are located between the other first side wall surface 122a and the protrusion 10 and are located on the other side of the explosion-proof valve 300. Specifically, along the length direction of the boss 110, part of the first through holes 170 are located between one first side wall surface 122a and one protrusion side surface 12, and the other part of the first through holes 170 are located between the other first side wall surface 122a and the other protrusion side surface 12.

[0055] The lower insulating piece 100 is further provided with a protective cover 180. The protective cover 180 is located between the first surface 101 and the first groove bottom wall surface 121, so that the protective cover 180 does not protrude relative to the first surface 101, facilitating the assembly between the lower insulating piece 100 and the end cover 200, thereby making the end cover assembly 3000 have good assembly stability. The protective cover 180 is arranged on the first groove bottom wall surface 121 and covers the first through hole 170 and is arranged in a spaced manner with the protrusion side surface 12 and the first groove side wall surface 122. The protective cover 180 is in a plurality. The plurality of protective covers 180 are arranged in a spaced manner, and each protective cover 180 covers one first through hole 170. Specifically, part of the protective covers 180 are located between one protrusion side surface 12 and one first side wall surface 122a, and the other part of the protective covers 180 are located between the other protrusion side surface 12 and the other first side wall surface 122a. Each protective cover 180 comprises a baffle 181 and a side plate 182. The baffle 181 and the side plate 182 are located on the side of the first groove bottom wall surface 121 away from the boss surface 111. The baffle 181 is arranged in a spaced manner with the first groove bottom wall surface 121 and completely covers the first through hole 170.

[0056] When a spark generated by a short circuit inside the energy storage device 1000 is blocked by the baffle 181 inside the energy storage device 1000 after passing through the first through hole 170, the spark is prevented from being sprayed from the first through hole 170 to the explosion-proof valve 300 and from the explosion-proof valve 300 to the outside of the energy storage device 1000, avoiding the spark from causing the energy storage device 1000 to catch fire in an environment with sufficient oxygen outside, and improving the safety performance of the energy storage device 1000.

[0057] The side plate 182 is arranged around the baffle plate 181 and around the opening of the first through hole 170 in the first groove bottom wall surface 121 and is connected between the baffle plate 181 and the first groove bottom wall surface 121. The side plate 182 is provided with a second through hole 183. The second through hole 183 penetrates the side plate 182 along the thickness direction of the side plate 182 and is in communication with the first through hole 170. The second through hole 183 has a plurality of second through holes. The plurality of second through holes 183 are arranged at intervals on the side plate 182, and two second through holes 183 are arranged opposite to each other along the width direction of the lower insulating member 100.

[0058] A large amount of high-temperature and high-pressure gas is generated in the energy storage device 1000 in the early stage of thermal runaway. The gas can flow from the first through hole 170 to the second through hole 183, and then to the explosion-proof valve 300, and then flow to the outside of the energy storage device 1000 through the explosion-proof valve 300. The arrangement of the second through hole 183 can ensure that the energy storage device 1000 has good exhaust performance.

[0059] Please continue to refer to Figure 3 and Figure 4 In the embodiment, the end cover 200 can be an aluminum sheet. The end cover 200 is located on the side of the first surface 101 away from the second surface 102. The end cover 200 includes a third surface 201, a fourth surface 202, and a third peripheral side surface 203. The third surface 201 is the surface of the end cover 200 away from the lower insulating member 100. The fourth surface 202 and the third surface 201 are arranged opposite to each other along the thickness direction of the end cover 200. The third peripheral side surface 203 is connected between the third surface 201 and the fourth surface 202.

[0060] The end cover 200 is provided with an explosion-proof hole 210, a second pole post hole 220 and a second liquid injection hole 230. The explosion-proof hole 210, the second pole post hole 220 and the second liquid injection hole 230 all penetrate the end cover 200 along the thickness direction of the end cover 200, and are all arranged away from the third lateral surface 203. Along the length direction of the end cover 200, the explosion-proof hole 210 is located in the middle of the end cover 200, and is arranged opposite to the first recess 120 and the air vent hole 140. It should be noted that the explosion-proof hole 210 is arranged opposite to the first recess 120 and the air vent hole 140 means that the orthographic projection of the explosion-proof hole 210 on the lower insulating piece 100 at least partially covers the first recess 120 and the air vent hole 140. The second pole post hole 220 is arranged away from the explosion-proof hole 210, and is in communication with the first pole post hole 150 to allow the pole post 500 to pass through. The second pole post hole 220 has two. Along the length direction of the end cover 200, the two second pole post holes 220 are respectively located on the two sides of the explosion-proof hole 210, and are respectively in communication with the two first pole post holes 150. Specifically, one second pole post hole 220 is in communication with one first pole post hole 150 to allow the positive pole post to pass through. The other second pole post hole 220 is in communication with the other first pole post hole 150 to allow the negative pole post to pass through. The second liquid injection hole 230 is located between the explosion-proof hole 210 and one second pole post hole 220, and is arranged away from the explosion-proof hole 210 and the second pole post hole 220, and is in communication with the first liquid injection hole 160.

[0061] The explosion-proof valve 300 is arranged opposite to the protrusion 10 and the air vent hole 140, and covers the opening of the explosion-proof hole 210 on the fourth surface 202. It should be noted that the explosion-proof valve 300 is arranged opposite to the protrusion 10 and the air vent hole 140 means that the orthographic projection of the explosion-proof valve 300 on the lower insulating piece 100 at least partially covers the protrusion 10 and the air vent hole 140. The protective sheet 400 covers the opening of the explosion-proof hole 210 on the third surface 201, and protects the explosion-proof valve 300.

[0062] Along the thickness direction of the end cover assembly 3000, each pole post 500 passes through one second pole post hole 220 and one first pole post hole 150. Each connecting sheet 600 is located on the side of the second surface 102 away from the end cover 200, and is fixedly connected with one pole post 500. Each upper insulating piece 700 is arranged around one pole post 500, and passes through one second pole post hole 220 and one first pole post hole 150. Each sealing ring 800 is sleeved on one upper insulating piece 700, and passes through one second pole post hole 220 and one first pole post hole 150, and is clamped between the fourth surface 202 of the end cover 200 and the surface of one pole post 500 close to the end cover 200, which not only can seal the gap between the upper insulating piece 700 and the lower insulating piece 100, to ensure the good air tightness of the end cover assembly 3000, but also can insulate the end cover 200 and the pole post 500.

[0063] The energy storage device 1000 provided in the embodiment can prevent the spark from reaching below the explosion-proof valve 300 and being sprayed out with the opening of the explosion-proof valve 300, thereby reducing the risk of fire and explosion caused by the spark outside the energy storage device 1000, and improving the safety performance of the energy storage device 1000. At the same time, when the energy storage device 1000 is in thermal runaway, the high-temperature and high-pressure gas generated in the energy storage device 1000 can be discharged from the first through hole 170 to the second through hole 183 of the side plate 182, and then flow to the explosion-proof valve 300 and be discharged with the opening of the explosion-proof valve 300, thereby ensuring the exhaust performance of the energy storage device 1000.

[0064] The embodiment also provides a power utilization device, for example, an energy storage cabinet, a new energy vehicle, etc. The power utilization device comprises the energy storage device 1000 in the above embodiment. Since the specific structure and technical effects of the energy storage device 1000 have been described in detail in the foregoing, the description is not repeated here. The power utilization device provided in the embodiment improves the exhaust performance and use safety and reliability of the power utilization device by arranging the energy storage device 1000.

[0065] The above description is only optional embodiments of the present application, and the above embodiments are only used to help understand the core idea of the present application, and do not limit the patent scope of the present application; at the same time, according to the concept of the present application, equivalent structural transformation by using the present application specification and drawings, or direct / indirect application in other related technical fields are also included in the patent protection scope of the present application.

Claims

1. A lower insulator for use in an end cap assembly, characterized by, The lower insulating member comprises a first surface and a second surface, the second surface is arranged opposite to the first surface along a thickness direction of the lower insulating member; The lower insulating member is provided with a boss, the boss is arranged on the second surface and protrudes away from the first surface, the boss comprises a boss surface facing away from the second surface; The lower insulating member is further provided with a first groove and a first through hole, an opening of the first groove is arranged on the first surface, the first groove is recessed from the first surface to the boss, the first groove comprises a first groove bottom wall surface, the first groove bottom wall surface is arranged opposite to the opening of the first groove and is arranged opposite to the boss surface, the first through hole penetrates the first groove bottom wall surface and the boss surface; The lower insulating member is further provided with a protective cover, the protective cover is arranged on the first groove bottom wall surface and covers the first through hole, the protective cover comprises a baffle and a side plate, the baffle is arranged on a side of the first groove bottom wall surface away from the boss surface and covers the first through hole, the side plate is arranged around the first through hole on the opening of the first groove bottom wall surface and is connected between the baffle and the first groove bottom wall surface.

2. The lower insulator of claim 1, wherein The side plate is provided with a second through hole, the second through hole penetrates the side plate along a thickness direction of the side plate and communicates with the first through hole.

3. The lower insulator of claim 2, wherein, There are multiple second through holes, the multiple second through holes are arranged at intervals, and two second through holes are arranged opposite to each other along a width direction of the lower insulating member.

4. The lower insulator of claim 1, wherein, There are multiple first through holes and multiple protective covers, the multiple first through holes are arranged at intervals, the multiple protective covers are arranged at intervals, and each protective cover covers a first through hole.

5. The lower insulator of claim 4, wherein, The first groove comprises two first side wall surfaces, the two first side wall surfaces are arranged opposite to each other along a width direction of the lower insulating member and are connected to opposite sides of the first groove bottom wall surface; The lower insulating member is further provided with a protrusion, the protrusion is arranged on the first groove bottom wall surface and is located between the two first side wall surfaces and is arranged at intervals from the two first side wall surfaces, wherein the protrusion is arranged corresponding to an explosion-proof valve of the end cover assembly; The protrusion is arranged at intervals from the first through hole, part of the first through hole is located between one first side wall surface and the protrusion, and part of the first through hole is located between the other first side wall surface and the protrusion.

6. The lower insulator of claim 5, wherein, The boss further comprises a first side surface and a second side surface, the first side surface and the second side surface are arranged opposite to each other along a length direction of the lower insulating member and are connected between the boss surface and the second surface; The protrusion is located between the two first side wall surfaces, the protrusion comprises a protrusion surface facing away from the first groove bottom wall surface; The lower insulating member is further provided with a second groove, an opening of the second groove is arranged on the boss surface, the second groove is recessed from the boss surface to the protrusion surface and penetrates the first side surface and the second side surface, the second groove comprises a second groove bottom wall surface, the second groove bottom wall surface is arranged opposite to the opening of the second groove and is arranged opposite to the protrusion surface; The lower insulation piece is provided with a gas-permeable hole penetrating through the second groove bottom wall surface and the convex surface.

7. The lower insulator of claim 6, wherein The convex further comprises two convex side surfaces, which are oppositely arranged along the width direction of the lower insulation piece and are connected between the convex surface and the first groove bottom wall surface. The second groove comprises two second groove side surfaces, which are oppositely arranged along the width direction of the lower insulation piece and are connected between the second groove bottom wall surface and the convex surface. The distance between each second groove side surface and the oppositely arranged convex side surface is w, and 1.3mm≤w≤2.5mm.

8. An end cap assembly characterized by, The energy storage device comprises a shell, an electric core assembly and the end cover assembly as claimed in claim 8, 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 communicates with the receiving cavity, the electric core assembly is contained in the receiving cavity, the end cover assembly is installed on the shell and seals the opening and is electrically connected with the electric core assembly, wherein the convex abuts against the electric core assembly. The energy storage device as claimed in claim 9 is used to supply power to the electric device. ​ 9. An energy storage device, characterized by, ​ 10. An electric device, characterized by ​

Images