Insulating piece, end cover assembly, energy storage device and electric appliance

Abstract

The application discloses an insulating piece, an end cover assembly, an energy storage device and an electric equipment. The insulating piece comprises a first surface and a second surface, and the first surface and the second surface are oppositely arranged along the thickness direction of the insulating piece. The insulating piece is provided with a flow guide groove, the opening of the flow guide groove is located on the first surface, the groove bottom wall of the flow guide groove is provided with a flow guide hole, and the flow guide hole penetrates through the groove bottom wall of the flow guide groove. The surface roughness of the groove bottom wall of the flow guide groove is greater than the surface roughness of the first surface. The insulating piece provided by the application can avoid the metal particles from entering the inside of the battery cell through the insulating piece to cause the short circuit of the energy storage device, and can improve the safety performance of the energy storage device.

Description

TECHNICAL FIELD

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

[0002] Secondary batteries, also known as rechargeable batteries or accumulators, are batteries that can be reactivated by charging after discharging. Secondary batteries include insulating pieces for insulating end covers and pole posts. The insulating pieces generally have flow guide grooves facing the end covers to cause electrolyte entering the gap between the end cover and the insulating piece to flow back to the battery cell. However, metal particles such as welding slag, broken tabs and other impurities can also enter the battery cell through the flow guide grooves, which can cause short circuit of the battery and affect the safety performance of the battery. SUMMARY

[0003] The present application provides an insulating piece, an end cover assembly, an energy storage device and an electric equipment, which can prevent metal particles from entering the battery cell through the insulating piece to cause short circuit of the energy storage device, and improve the safety performance of the energy storage device.

[0004] In a first aspect, the present application provides an insulating piece for an energy storage device. The insulating piece includes a first surface and a second surface, the first surface and the second surface being oppositely arranged along the thickness direction of the insulating piece. The insulating piece is provided with a flow guide groove, the opening of the flow guide groove being located on the first surface, the groove bottom wall of the flow guide groove being provided with a flow guide hole, the flow guide hole being along the groove bottom wall of the flow guide groove. The surface roughness of the groove bottom wall of the flow guide groove is greater than the surface roughness of the first surface.

[0005] In a possible implementation, the flow guide groove is at least two, two of the at least two flow guide grooves being a first flow guide groove and a second flow guide groove, the first flow guide groove and the second flow guide groove being spaced apart along the length direction of the insulating piece and being respectively located at opposite edge regions of the length direction of the insulating piece. The groove bottom wall of the first flow guide groove is provided with a first flow guide hole, the first flow guide hole penetrating the groove bottom wall of the first flow guide groove. The groove bottom wall of the second flow guide groove is provided with a second flow guide hole, the second flow guide hole penetrating the groove bottom wall of the second flow guide groove. The surface roughness of the groove bottom wall of the first flow guide groove and the surface roughness of the groove bottom wall of the second flow guide groove are both greater than the surface roughness of the first surface.

[0006] In one possible implementation, the insulating member is provided with a first groove, and an opening of the first groove is located on the first surface and between the first flow guide groove and the second flow guide groove. A bottom wall of the first groove is provided with a first air hole penetrating through the bottom wall of the first groove. The first groove includes a first inclined surface and a second inclined surface, and the first inclined surface and the second inclined surface are oppositely arranged along a length direction of the insulating member. Along the length direction of the insulating member and from the first inclined surface to the second inclined surface, a distance from the first inclined surface to the first surface along a thickness direction of the insulating member gradually increases. Along the length direction of the insulating member and from the second inclined surface to the first inclined surface, a distance from the second inclined surface to the first surface along the thickness direction of the insulating member gradually increases.

[0007] In one possible implementation, a surface roughness of the first inclined surface is greater than a surface roughness of the first surface, or / and a surface roughness of the second inclined surface is greater than the surface roughness of the first surface.

[0008] In one possible implementation, a surface roughness of the bottom wall of the flow guide groove is greater than or equal to Ra0.8 and less than or equal to Ra12.5, and a surface roughness of the first surface is greater than or equal to Ra0.02 and less than or equal to Ra1.6.

[0009] In one possible implementation, a surface roughness of the second surface is greater than a surface roughness of the first surface.

[0010] In one possible implementation, the bottom wall of the first flow guide groove is provided with a plurality of first pushing points, and the plurality of first pushing points are arranged at intervals along a width direction of the insulating member.

[0011] In one possible implementation, the insulating member has a first center line, the first center line is parallel to a length direction of the insulating member, and a distance from the first center line to opposite edges of a width direction of the insulating member is equal. The plurality of first pushing points are asymmetrically arranged about the first center line.

[0012] In one possible implementation, the first flow guide groove includes a plurality of first sub-grooves, and the plurality of first sub-grooves are arranged at intervals along a width direction of the insulating member. A bottom wall of each first sub-groove is provided with at least one first flow guide hole penetrating through the bottom wall of the first sub-groove. The bottom wall of each first sub-groove is provided with at least one first pushing point, and the number of the first pushing points of at least two first sub-grooves is different.

[0013] In one possible embodiment, the bottom wall of the second guide groove is provided with a plurality of second push points, which are spaced apart along the width direction of the insulating member. The insulating member has a second centerline, which is parallel to the width direction of the insulating member and is equidistant from the second centerline to two opposite edges of the insulating member in the longitudinal direction. The second push points are symmetrically arranged with respect to the first push points about the second centerline.

[0014] In one possible embodiment, the insulating member is provided with a first through-hole, an injection hole, and a second through-hole. The first through-hole, the injection hole, and the second through-hole are spaced apart along the length of the insulating member and extend through the first and second surfaces along the thickness of the insulating member. The injection hole is provided between the first groove and the first guide groove, the first through-hole is provided between the injection hole and the first guide groove, and the second through-hole is provided between the first groove and the second guide groove.

[0015] The first through hole is used for the positive electrode of the energy storage device to pass through, and the second through hole is used for the negative electrode of the energy storage device to pass through; or, the first through hole is used for the negative electrode of the energy storage device to pass through, and the second through hole is used for the positive electrode of the energy storage device to pass through.

[0016] In a second aspect, the present application provides an end cap assembly, comprising an end cap and an insulating member, wherein the insulating member and the end cap are stacked and fixedly connected along a thickness direction of the end cap assembly, and the first surface faces the end cap.

[0017] In one possible embodiment, the end cap further comprises an injection hole and an explosion-proof hole, the explosion-proof hole and the injection hole being spaced apart along the length of the insulating member; the injection hole is disposed opposite and in communication with the injection hole of the insulating member. The end cap assembly further comprises an explosion-proof valve disposed within the explosion-proof hole and fixedly connected to the inner wall of the explosion-proof hole. Along the thickness of the end cap assembly, the explosion-proof valve is disposed opposite the groove of the insulating member and spaced apart from the bottom wall of the first groove.

[0018] In a third aspect, the present application provides an energy storage device. The energy storage device includes a housing, an electrode assembly, and an end cap assembly. The housing has an opening and a receiving cavity, the receiving cavity communicating with the opening. The electrode assembly is disposed within the receiving cavity, the end cap assembly covers the opening, the second surface faces the receiving cavity, and the end cap assembly is fixedly connected to the housing.

[0019] In a fourth aspect, the present application provides an electric device, which includes the above-mentioned energy storage device, and the energy storage device is used to supply power to the electric device.

[0020] In the present application, by arranging the flow guide groove on the insulating part, and setting the surface roughness of the groove bottom wall of the flow guide groove to be greater than the surface roughness of the first surface, the metal particles and other impurities falling into the flow guide groove can be blocked at the groove bottom wall of the flow guide groove, so that the metal particles or other impurities entering the inside of the electrode assembly along the flow guide groove and the flow guide hole can be reduced or even avoided, and the safety performance of the energy storage device can be improved. For example, by setting the surface roughness of the groove bottom wall of the flow guide groove to be greater than the surface roughness of the first surface, the larger size metal particles among the metal particles falling into the flow guide groove can be clamped in the rough particle gap of the groove bottom wall of the flow guide groove. At the same time, by setting the surface roughness of the groove bottom wall of the flow guide groove to be greater than the surface roughness of the first surface, the path of the smaller size metal particles among the metal particles falling into the flow guide groove back to the inside of the energy storage device can be longer, and the friction between the smaller metal particles and the first bottom wall can be increased, so that the difficulty of the smaller size metal particles among the metal particles falling into the flow guide groove back to the inside of the energy storage device can be increased, and the short circuit inside the energy storage device can be reduced or even avoided.

[0021] At the same time, in the present application, by setting the surface roughness of the groove bottom wall of the flow guide groove to be greater than the surface roughness of the first surface, when the insulating part is about to be separated from the moving die surface of the forming mold, a small gap can be formed between the groove bottom wall of the flow guide groove and the mold, so that space can enter the gap, and the convenience of demolding of the forming mold and the insulating part can be improved, and the production efficiency and yield of the insulating part can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0023] Figure 1 is the application scenario diagram of the electric equipment provided by the embodiment of the present application;

[0024] Figure 2 is the structural schematic diagram of the energy storage device provided by the present application;

[0025] Figure 3 is Figure 2 is the exploded structural schematic diagram of the energy storage device shown in the figure;

[0026] Figure 4 is Figure 2 is the exploded structural schematic diagram of the end cover assembly in the energy storage device shown in the figure;

[0027] Figure 5 isFigure 4 Structure diagram of the insulating piece in the end cover assembly shown;

[0028] Figure 6 is Figure 5 Structure diagram of the insulating piece shown at another angle;

[0029] Figure 7 is Figure 5 Structure diagram of the insulating piece shown in a partial cross-section along the A-A direction;

[0030] Figure 8 is Figure 5 Structure diagram of the insulating piece shown at yet another angle.

[0031] Reference: energy storage system 1000; electric energy conversion device 200; wind energy conversion device 210; first user load 220; energy storage cabinet 230; energy storage device 100; housing 50; receiving cavity 51; electrode assembly 70; pole core 71; positive electrode lug 711; negative electrode lug 712; first connecting piece 61; second connecting piece 62; end cover assembly 1; end cover 20; first upper plastic 31; second upper plastic 32; insulating piece 10; first pole 41; second pole 42; explosion-proof valve 80; top surface 21; back surface 22; first pole through hole 23; second pole through hole 24; explosion-proof hole 25; liquid injection through hole 26; insulating piece body 11; first surface 111; second surface 112; first through hole 113; second through hole 114; liquid injection hole 115; explosion-proof boss 12; first bottom surface 121; second recess 13; boss 14; first recess 141; first inclined surface 142; second inclined surface 143; connecting surface 144; first air vent hole 131; second air vent hole 145; first boss 15; second bottom surface 151; second boss 16; third bottom surface 161; first flow guide groove 17; first bottom wall 171; first side wall 172; first partition 173; first sub-groove 174; first first sub-groove 1741; second first sub-groove 1742; third first sub-groove 1743; fourth first sub-groove 1744; first flow guide hole 175; second flow guide groove 18; second bottom wall 181; second side wall 182; second partition 183; second sub-groove 184; first second sub-groove 1841; second second sub-groove 1842; third second sub-groove 1843; fourth second sub-groove 1844; second flow guide hole 185; push point 101; first push point 102; first first push point 1021; second first push point 1022; third first push point 1023; fourth first push point 1024; second push point 103; first second push point 1031; second second push point 1032; third second push point 1033; fourth second push point 1034; first center line P1; second center line P2. DETAILED DESCRIPTION

[0032] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] Since the energy required by people has strong time and space characteristics, in order to reasonably use energy and improve the utilization rate of energy, it is necessary to store one form of energy in the same form or convert it into another form of energy through a medium or device, and then release it in a specific energy form based on future application needs. As we all know, in order to achieve the goal of carbon neutrality, the main way to generate green electricity at present is to develop green energy such as photovoltaic and wind power to replace fossil energy. At present, the generation of green electricity generally depends on photovoltaic, wind power, water potential, etc., and wind energy and solar energy generally have strong intermittency and large fluctuation, which will cause the instability of the power grid, and there will not be enough electricity during the peak of electricity consumption, and there will be too much electricity during the low point of electricity consumption. Unstable voltage will also cause damage to electricity, so it may cause the problem of "abandoning wind and light" due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, it is necessary to rely on energy storage. That is, the electricity is converted into other forms of energy through physical or chemical means and stored, and the energy is converted into electricity and released when needed. In short, energy storage is similar to a large "power bank", which stores electricity when photovoltaic and wind energy is sufficient, and releases the stored electricity when needed.

[0034] Taking electrochemical energy storage as an example, the present scheme provides an energy storage device, which is provided with a group of chemical batteries inside. The main purpose is to use chemical elements in the chemical batteries as energy storage medium. The charging and discharging process is accompanied by chemical reaction or change of the energy storage medium. In short, the electricity generated by wind and solar energy is stored in the chemical battery, and the stored electricity is released for use when the use of external electricity reaches the peak, or transferred to places where electricity is in short supply for use.

[0035] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0036] (1) Large energy storage containers applied in power grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, realize load matching of electricity in time and space, enhance renewable energy consumption capacity, and have great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0037] (2) The small and medium-sized energy storage cabinet applied in the commercial energy storage scene of the user side (bank, shopping mall, etc.) and the small household energy storage box applied in the household energy storage scene of the user side, the main operation mode of which is "peak load shifting". Because there is a large price difference in electricity charges at the peak and valley positions according to the electricity demand, after the user has the energy storage device, in order to reduce the cost, the energy storage cabinet / box is usually charged during the low electricity price period; the electricity in the energy storage device is discharged for use during the high electricity price period, so as to achieve the purpose of saving electricity charges. In addition, in remote areas and areas where natural disasters such as earthquakes and hurricanes are prone to occur, the existence of household energy storage devices is equivalent to that the user provides a standby power source for himself and the power grid, which eliminates the inconvenience caused by frequent power outages due to disasters or other reasons.

[0038] Please refer to Figure 1 , Figure 1 is an application scenario diagram of the power utilization equipment provided by the embodiment of the present application. The embodiment of the present application takes the household energy storage scene in the user side energy storage as an example for description, and the energy storage device of the present application is not limited to the household energy storage scene.

[0039] The present application provides a household energy storage system 1000, which comprises an electric energy conversion device 200 (photovoltaic panel), a wind energy conversion device 210 (windmill), a first user load 220 (base station), a second user load (not shown in the figure) (commercial side), etc. and an energy storage device 100. The energy storage system 1000 further comprises an energy storage cabinet 230, and the energy storage device is installed in the energy storage cabinet 230, which is convenient for installation outdoors. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy during the low electricity price period, the energy storage device is used to store the electric energy and supply the base station and the commercial side for use during the high electricity price period, or supply power during the power grid outage / power failure. The wind energy conversion device 210 (windmill) can convert wind energy into electric energy, the energy storage device is used to store the electric energy and supply the base station and the commercial side for use during the high electricity price period, or supply power during the power grid outage / power failure. Wherein, the transmission of electric energy can be transmitted by high-voltage cable.

[0040] Wherein, the energy storage cabinet 230 can be understood as a power utilization equipment. The energy storage device can also be used in the form of an energy storage container, a small and medium-sized energy storage cabinet, a small household energy storage box, etc. The energy storage container, the small and medium-sized energy storage cabinet, the small household energy storage box, etc. contain the energy storage device. The above-mentioned energy storage container, small and medium-sized energy storage cabinet, small household energy storage box, etc. containing the energy storage device can be understood as a power utilization equipment.

[0041] It can be understood that the energy storage device 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 in 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. The embodiments of the present application only take the energy storage device as a multi-core battery as an example for description.

[0042] Please refer to Figure 2 and Figure 3 , Figure 2 is a structural schematic diagram of the energy storage device 100 provided by the present application, Figure 3 is Figure 2 the exploded structural schematic diagram of the energy storage device 100 shown in FIG. 1.

[0043] For the convenience of description, in the present application, the length direction of the energy storage device 100 is the first direction, that is, the X direction; the width direction of the energy storage device 100 is the second direction, that is, the Y direction; and the thickness direction of the energy storage device 100 is the third direction, that is, the Z direction. The X direction, the Y direction and the Z direction are perpendicular to each other.

[0044] The energy storage device 100 includes a shell 50, an end cover assembly 1, an electrode assembly 70, an electrolyte, a first connecting piece 61 and a second connecting piece 62. The shell 50 is provided with a receiving cavity 51, and the opening of the receiving cavity 51 is located at one side of the shell 50 in the height direction. The electrode assembly 70 and the electrolyte are located in the receiving cavity 51, and the electrode assembly 70 is soaked in the electrolyte. The electrode assembly 70 includes a plurality of pole cores 71. The plurality of pole cores 71 are arranged side by side along the width direction (Y direction) of the energy storage device 100. The pole core 71 includes a positive electrode lug 711 and a negative electrode lug 712. The end cover assembly 1 is installed on the opening side of the shell 50 and is fixedly connected with the shell 50 to close the receiving cavity 51. The first connecting piece 61 is connected between the positive electrode lug 711 and the positive electrode column of the end cover assembly 1, and the second connecting piece 62 is connected between the negative electrode lug 712 and the negative electrode column of the end cover assembly 1.

[0045] In the present embodiment, the outer side of the electrode assembly 70 is also covered with an insulating film (not shown in the figure) for protecting the pole core 71 and avoiding scratching of the pole core 71. The insulating film covers the outer surface of the electrode assembly 70, and the side edges of the insulating film are hot-melt bonded with the end cover assembly 1.

[0046] Please refer to Figure 4 , Figure 4 is Figure 2 the exploded structural schematic diagram of the end cover assembly 1 in the energy storage device 100 shown in FIG. 1.

[0047] The end cover assembly 1 comprises an end cover 20, a first upper plastic 31, a second upper plastic 32, an insulating piece 10, a first pole 41, a second pole 42 and an explosion-proof valve 80. In the embodiment, the end cover 20 is a rectangular thin plate. In other embodiments, the end cover 20 can also be a circular plate, an oval plate or other special-shaped plate. In the embodiment, the end cover 20 is an aluminum piece. The end cover 20 comprises a top surface 21 and a back surface 22. The top surface 21 and the back surface 22 are oppositely arranged along the Z direction. The end cover 20 is provided with a first pole through hole 23, a second pole through hole 24, an explosion-proof hole 25 and a liquid injection through hole 26. Along the length direction of the end cover 20, i.e. along the X direction, the first pole through hole 23, the liquid injection through hole 26, the explosion-proof hole 25 and the second pole through hole 24 are sequentially and spacedly arranged. Moreover, the first pole through hole 23, the liquid injection through hole 26, the explosion-proof hole 25 and the second pole through hole 24 all penetrate the top surface 21 and the back surface 22 along the Z direction.

[0048] The first pole 41 is arranged in the first pole through hole 23. The first upper plastic 31 is sleeved on the outer periphery of the first pole 41 and arranged on the top surface 21 of the end cover 20, and the first upper plastic 31 is fixedly connected with the end cover 20. The first pole 41 is insulated from the end cover 20 by the first upper plastic 31. The second pole 42 is arranged in the second pole through hole 24. The second upper plastic 32 is sleeved on the outer periphery of the second pole 42 and arranged on the top surface 21 of the end cover 20, and the second upper plastic 32 is fixedly connected with the end cover 20. The second pole 42 is insulated from the end cover 20 by the second upper plastic 32. In the embodiment, the first pole 41 is a positive pole, and the second pole 42 is a negative pole. In other embodiments, the first pole 41 can also be a negative pole, and the second pole 42 is a positive pole.

[0049] The explosion-proof valve 80 is mounted in the explosion-proof hole 25 and fixedly connected with the end cover 20. For example, the explosion-proof valve 80 is welded with the inner wall of the explosion-proof hole 25. When the pressure inside the energy storage device 100 is too large, the explosion-proof valve 80 will automatically open to release pressure, so as to prevent the energy storage device 100 from exploding and improve the safety performance of the energy storage device 100.

[0050] The liquid injection through hole 26 is arranged between the explosion-proof valve 80 and the first pole 41. In the liquid injection process of the energy storage device 100, electrolyte is injected into the energy storage device 100 through the liquid injection through hole 26.

[0051] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 4 the structure diagram of the insulating piece 10 in the end cover assembly 1 shown in Figure 6 is Figure 5 the structure diagram of the insulating piece 10 shown in another angle.

[0052] The insulation piece 10 is a lower plastic in the end cover assembly 1. In this embodiment, the insulation piece 10 is substantially in the shape of a rectangular sheet. The insulation piece 10 is made of an insulating material. For example, the insulation piece 10 is made of plastic or rubber, or the insulation piece 10 can be made of other insulating materials. The insulation piece 10 is stacked along the Z direction with the end cover 20 and is fixedly connected with the end cover 20.

[0053] The insulation piece 10 includes an insulation piece body 11. The insulation piece body 11 includes a first surface 111 and a second surface 112. The first surface 111 and the second surface 112 are oppositely arranged along the thickness direction of the insulation piece body 11, i.e., oppositely arranged along the Z direction. The first surface 111 faces the end cover 20, and the second surface 112 faces the battery cell assembly. In this embodiment, the first surface 111 and the second surface 112 are substantially planar, or can be slightly curved, which is not limited here.

[0054] The surface roughness of the first surface 111 is less than the surface roughness of the second surface 112. That is, the first surface 111 is smoother than the second surface 112, and the second surface 112 is rougher than the first surface 111. That is, the first surface 111 is a smooth surface, and the second surface 112 is a rough surface. The second surface 112 is a non-flat surface formed by a plurality of concave portions and a plurality of convex portions arranged alternately. For example, the surface roughness of the first surface 111 is greater than or equal to Ra0.02 and less than or equal to Ra1.6, and the surface roughness of the second surface 112 is greater than or equal to Ra0.8 and less than or equal to Ra12.5. Specifically, the surface roughness of the second surface 112 can be increased by rough grinding processing on the second surface 112. Alternatively, the position corresponding to the second surface 112 on the forming mold for forming the insulation piece 10 can be rough ground, so that the second surface 112 of the insulation piece 10 obtained in the injection molding process has a greater surface roughness.

[0055] It should be noted that the "surface roughness" refers to the unevenness of small spacing and small peaks and valleys on the processed surface. The greater the surface roughness, the rougher the surface of the object, and the higher the unevenness of the small peaks and valleys on the surface of the object. The smaller the surface roughness, the smoother the surface of the object, and the smaller the unevenness of the small peaks and valleys on the surface of the object.

[0056] The insulation member body 11 is provided with a first through hole 113 and a second through hole 114. The first through hole 113 and the second through hole 114 are arranged side by side and spaced apart along the X direction. Moreover, the first through hole 113 and the second through hole 114 penetrate the first surface 111 and the second surface 112 along the thickness direction of the insulation member body 11. The first through hole 113 is arranged corresponding to the first pole post through hole 23. The first pole post 41 passes through the first pole post through hole 23 and the first through hole 113, and is connected with the first connecting member 61. The second through hole 114 is arranged corresponding to the second pole post through hole 24. The second pole post 42 passes through the second pole post through hole 24 and the second through hole 114, and is connected with the second connecting member 62.

[0057] The insulation member body 11 is further provided with a liquid injection hole 115. The liquid injection hole 115 is arranged spaced apart from the first through hole 113 and the second through hole 114, and penetrates the first surface 111 and the second surface 112 along the thickness direction of the insulation member body 11. In the embodiment, the liquid injection hole 115 is arranged between the first through hole 113 and the second through hole 114. In other embodiments, the liquid injection hole 115 can be arranged on the side of the first through hole 113 away from the second through hole 114, or the liquid injection hole 115 is arranged on the side of the second through hole 114 away from the first through hole 113, or the liquid injection hole 115 is arranged side by side and spaced apart from the first through hole 113 or the second through hole 114 along the Y direction. The liquid injection hole 115 is arranged corresponding to the liquid injection through hole on the end cover 20. In the liquid injection process of the energy storage device 100, the electrolyte flows into the accommodation cavity 51 of the shell 50 through the liquid injection through hole and the liquid injection hole 115, so that the electrode assembly 70 is soaked.

[0058] The insulation member 10 further comprises an explosion-proof boss 12. The explosion-proof boss 12 is arranged at the middle of the length direction of the insulation member body 11, and is located between the liquid injection hole 115 and the second through hole 114. The explosion-proof boss 12 is arranged on the second surface 112 and protrudes from the second surface 112. The explosion-proof boss 12 comprises a first bottom surface 121. The orientation of the first bottom surface 121 is the same as that of the second surface 112. It can be understood that the first bottom surface 121 protrudes from the second surface 112 along the Z direction.

[0059] The insulation member 10 is provided with a second groove 13. The opening of the second groove 13 is located on the first surface 111 and is recessed towards the direction of the explosion-proof boss 12. The second groove 13 is substantially rectangular and is arranged along the Y direction.

[0060] Please refer to Figure 7 , Figure 7 is Figure 5 the partial cross-sectional structure schematic view of the insulation member 10 shown in FIG. 1 along the A-A direction.

[0061] The second groove 13 is provided with a boss 14. The boss 14 is located in the middle region of the second groove 13 in the Y direction. The boss 14 is connected with the two opposite side wall surfaces of the second groove 13 in the X direction, and is spaced apart from the two opposite side wall surfaces of the second groove 13 in the Y direction. The boss 14 is provided with a first groove 141. The first groove 141 is recessed from the first surface 111 towards the groove bottom wall of the second groove 13, that is, towards the explosion-proof boss 12. In this embodiment, the first groove 141 is a "U"-shaped groove. The first groove 141 includes a first inclined surface 142, a second inclined surface 143 and a connecting surface 144. The first inclined surface 142, the connecting surface 144 and the second inclined surface 143 are sequentially connected in the X direction and jointly form the inner wall of the first groove 141. One end of the first inclined surface 142 away from the connecting surface 144 is connected with the first surface 111, and one end of the second inclined surface 143 away from the connecting surface 144 is connected with the first surface 111. The first inclined surface 142 and the second inclined surface 143 are oppositely arranged in the X direction.

[0062] In this embodiment, the first inclined surface 142 and the second inclined surface 143 are both inclined surfaces. The angle between the first inclined surface 142 and the Z direction is greater than 0 degrees and less than 90 degrees, and the angle between the first inclined surface 142 and the X direction is greater than 0 degrees and less than 90 degrees. In the length direction of the insulating part 10 and from the first inclined surface 142 to the second inclined surface 143, that is, in the positive direction of the X axis, the distance from the first inclined surface 142 to the first surface 111 in the thickness direction (Z direction) of the insulating part 10 gradually increases. The angle between the second inclined surface 143 and the Z direction is greater than 0 degrees and less than 90 degrees, and the angle between the second inclined surface 143 and the X direction is greater than 0 degrees and less than 90 degrees. In the length direction of the insulating part 10 and from the second inclined surface 143 to the first inclined surface 142, that is, in the negative direction of the X axis, the distance from the second inclined surface 143 to the first surface 111 in the thickness direction (Z direction) of the insulating part 10 gradually increases. That is, in the direction from the groove bottom wall of the first groove 141 to the opening of the first groove 141, the distance between the first inclined surface 142 and the second inclined surface 143 in the X direction gradually decreases, and the size of the first groove 141 in the X direction gradually decreases.

[0063] In this embodiment, the first inclined surface 142 and the second inclined surface 143 are both concave inclined surfaces. The slope of the first inclined surface 142 gradually decreases towards the connecting surface 144, that is, the first inclined surface 142 becomes flatter and flatter. The slope of the second inclined surface 143 gradually decreases towards the connecting surface 144, that is, the second inclined surface 143 becomes flatter and flatter. In other embodiments, the first inclined surface 142 can also be an equal-inclination surface or a convex inclined surface, and the second inclined surface 143 can also be an equal-inclination surface or a convex inclined surface. The "equal-inclination surface" refers to an inclined surface with substantially consistent slope in the extension direction of the inclined surface, and the "convex inclined surface" refers to an inclined surface with slope gradually increasing in the downhill direction.

[0064] The surface roughness of the first inclined surface 142 and the second inclined surface 143 is less than the surface roughness of the first surface 111. That is, the first inclined surface 142 and the second inclined surface 143 are rough surfaces. The first inclined surface 142 is formed by a plurality of concave portions and a plurality of convex portions arranged alternately, and the second inclined surface 143 is formed by a plurality of concave portions and a plurality of convex portions arranged alternately. For example, the surface roughness of the first inclined surface 142 is greater than or equal to Ra0.8 and less than or equal to Ra12.5, and the surface roughness of the second inclined surface 143 is greater than or equal to Ra0.8 and less than or equal to Ra12.5. Specifically, the surface roughness of the first inclined surface 142 and the second inclined surface 143 can be increased by rough grinding. Alternatively, the surface roughness of the first inclined surface 142 and the second inclined surface 143 of the insulation piece 10 obtained in the injection molding process can be increased by rough grinding on the corresponding positions of the first inclined surface 142 and the second inclined surface 143 of the forming mold for forming the insulation piece 10.

[0065] Please continue to refer to Figure 5 and Figure 6 The insulation piece 10 further comprises a first vent hole 131 and a second vent hole 145. The first vent hole 131 is arranged on the bottom wall of the second groove 13 and penetrates the first bottom surface 121. The first vent hole 131 is a plurality of holes. The plurality of first vent holes 131 are arranged in an array along the X direction and the Y direction. In this embodiment, the first vent hole 131 is a circular hole. In other embodiments, the first vent hole 131 can also be a square hole or other special-shaped hole.

[0066] The second vent hole 145 is arranged on the inner wall of the first groove 141 and penetrates the first bottom surface 121. The second vent hole 145 is a plurality of holes, and the plurality of second vent holes 145 are arranged at intervals to form an explosion-proof fence. The explosion-proof fence can prevent foreign matter from entering the end cover 20 from the battery cell assembly, and can improve the strength of the insulation piece 10, and can reduce or even avoid deformation of the insulation piece 10. In this embodiment, the second vent hole 145 is a strip-shaped hole, and the plurality of second vent holes 145 are arranged in a ring shape to form a ring structure. In other embodiments, the second vent hole 145 can also be a circular hole, a square hole or other special-shaped hole.

[0067] The insulation piece 10 further comprises a first boss 15 and a second boss 16. The first boss 15 and the second boss 16 are arranged on opposite sides of the body in the length direction. The first boss 15 and the second boss 16 are arranged on the second surface 112 and protrude from the second surface 112. The first boss 15 comprises a second bottom surface 151. The orientation of the second bottom surface 151 is the same as that of the second surface 112. The second bottom surface 151 protrudes from the second surface 112 along the Z direction.

[0068] The insulation piece 10 is provided with flow guide grooves. The openings of the flow guide grooves are located on the first surface 111. The groove bottom walls of the flow guide grooves are provided with flow guide holes that penetrate the groove bottom walls of the flow guide grooves. There are at least two flow guide grooves, and the groove bottom walls of each flow guide groove are provided with flow guide holes. In this embodiment, there are two flow guide grooves. The two flow guide grooves are a first flow guide groove 17 and a second flow guide groove 18. The first flow guide groove 17 and the second flow guide groove 18 are arranged at intervals along the length direction of the insulation piece 10 and are respectively located at opposite edge regions of the length direction of the insulation piece 10.

[0069] The opening of the first flow guide groove 17 is located on the first surface 111 and is recessed towards the first boss 15. In this embodiment, the first flow guide groove 17 is substantially rectangular and is arranged along the Y direction. The first flow guide groove 17 includes a first bottom wall 171 and a first side wall 172. The first side wall 172 is arranged around the first bottom wall 171 and is connected to the first bottom wall 171. The first bottom wall 171 is arranged opposite the opening of the first flow guide groove 17. It can be understood that the first bottom wall 171 is the groove bottom wall of the first flow guide groove 17.

[0070] The surface roughness of the first bottom wall 171 is less than the surface roughness of the first surface 111. That is, the first bottom wall 171 is a rough surface. The first bottom wall 171 is a non-flat surface, and the first bottom wall 171 is formed by a plurality of recessed portions and a plurality of protruding portions arranged alternately. For example, the surface roughness of the first bottom wall 171 is greater than or equal to Ra0.8 and less than or equal to Ra12.5. Specifically, the surface roughness of the first bottom wall 171 can be increased by rough polishing. Alternatively, the position corresponding to the first bottom wall 171 on the forming mold for forming the insulation piece 10 can be rough polished, so that the first bottom wall 171 of the insulation piece 10 obtained in the injection molding process has a greater surface roughness.

[0071] The first flow guide groove 17 is provided with a plurality of first partition plates 173. The plurality of first partition plates 173 are arranged at intervals along the Y direction and are connected to the first bottom wall 171 and the first side wall 172. The plurality of first partition plates 173 divide the first flow guide groove 17 into a plurality of first sub-grooves 174. The plurality of first sub-grooves 174 are arranged at intervals along the Y direction. The length of each first sub-groove 174 can be the same or different. In this embodiment, the number of first partition plates 173 is three. The three first partition plates 173 are arranged at intervals along the Y direction and divide the first flow guide groove 17 into four first sub-grooves 174. In other embodiments, the number of first partition plates 173 can be two, four or more than five.

[0072] The first bottom wall 171 is provided with first flow guide holes 175. The first flow guide holes 175 penetrate the first bottom wall 171 and the second bottom surface 151. That is, the first flow guide holes 175 communicate the first flow guide groove 17 and the receiving cavity 51 of the shell 50. The electrolyte entering the first flow guide groove 17 can flow into the receiving cavity 51 through the first flow guide holes 175. The number of the first flow guide holes 175 is multiple. The groove bottom wall of each first sub-groove 174 is provided with at least one first flow guide hole 175. The electrolyte entering each first sub-groove 174 can flow into the receiving cavity 51 through the corresponding first flow guide hole 175. In the embodiment, the groove bottom wall of each first sub-groove 174 is provided with two first flow guide holes 175. The two first flow guide holes 175 are arranged side by side and spaced apart along the Y direction on the groove bottom wall of the corresponding first sub-groove 174. It can be understood that in the embodiment, the number of the first flow guide holes 175 is eight. The eight first flow guide holes 175 are arranged side by side and spaced apart along the Y direction, and the eight first flow guide holes 175 are arranged in a straight line along the Y direction.

[0073] The second protrusion 16 includes a third bottom surface 161. The orientation of the third bottom surface 161 is the same as that of the second surface 112. The third bottom surface 161 protrudes from the second surface 112 along the Z direction.

[0074] The insulating piece 10 is also provided with a second flow guide groove 18. The opening of the second flow guide groove 18 is located on the second surface 112 and recessed towards the direction of the second protrusion 16. The second flow guide groove 18 includes a second bottom wall 181 and a second side wall 182. The second side wall 182 is arranged around the second bottom wall 181 and connected with the second bottom wall 181. It can be understood that the second bottom wall 181 is the groove bottom wall of the second flow guide groove 18. The surface roughness of the second bottom wall 181 is less than that of the first surface 111. That is, the second bottom wall 181 is a rough surface. The second bottom wall 181 is a non-flat surface, and the second bottom wall 181 is formed by a plurality of concave portions and a plurality of convex portions arranged alternately. For example, the surface roughness of the second bottom wall 181 is greater than or equal to Ra0.8 and less than or equal to Ra12.5. Specifically, the surface roughness of the second bottom wall 181 can be increased by rough polishing. Alternatively, the position corresponding to the second bottom wall 181 on the forming mold for forming the insulating piece 10 can be rough polished, so that the second bottom wall 181 of the insulating piece 10 obtained in the injection molding process has a larger surface roughness.

[0075] A plurality of second partitions 183 are provided in the second guide groove 18. The plurality of second partitions 183 are arranged in sequence along the Y direction and are connected to the second bottom wall 181 and the second side wall 182. The plurality of second partitions 183 divide the second guide groove 18 into a plurality of second sub-grooves 184. The plurality of second sub-grooves 184 are arranged in sequence along the Y direction. The length of each second sub-grooves 184 may be the same or different. In this embodiment, the number of second partitions 183 is three. The three second partitions 183 are arranged in sequence along the Y direction and divide the second guide groove 18 into four second sub-grooves 184. In other embodiments, the number of second partitions 183 may also be two, four or more than five.

[0076] The second bottom wall 181 is provided with a second flow guide hole 185. The second flow guide hole 185 passes through the second bottom wall 181 and the second bottom surface 151. That is, the second flow guide hole 185 connects the second flow guide groove 18 and the receiving chamber 51 of the shell 50. The electrolyte entering the second flow guide groove 18 can flow into the receiving chamber 51 through the second flow guide hole 185. There are multiple second flow guide holes 185. The bottom wall of each second sub-groove 184 is provided with at least one second flow guide hole 185. The electrolyte entering each second sub-groove 184 can flow into the receiving chamber 51 through the corresponding second flow guide hole 185. In this embodiment, the bottom wall of each second sub-groove 184 is provided with two second flow guide holes 185. The two second flow guide holes 185 are arranged side by side and spaced apart along the Y direction on the bottom wall of the corresponding second sub-groove 184. It will be understood that in this embodiment, the number of second flow guide holes 185 is eight. The eight second air guiding holes 185 are arranged side by side and at intervals along the Y direction, and the eight second air guiding holes 185 are arranged in a straight line along the Y direction.

[0077] like Figure 3 and Figure 4 As shown, the insulating member 10 and the end cap 20 are stacked along the Z direction and fixedly connected to the end cap 20. The first surface 111 faces the back of the end cap 20, and the first surface 111 is fixedly connected to the back. In this embodiment, the insulating member 10 and the end cap 20 are fixedly connected by hot melt.

[0078] The first through-hole 113 and the first pole through-hole 23 are arranged opposite each other along the Z direction and are interconnected. The first pole 41 passes through the first pole through-hole 23 and the first through-hole 113 and is connected to the first connector 61. The second through-hole 114 and the second pole through-hole 24 are arranged opposite each other along the Z direction and are interconnected. The second pole 42 passes through the second pole through-hole 24 and the second through-hole 114 and is connected to the second connector 62.

[0079] The explosion-proof valve 80 and the explosion-proof boss 12 are positioned opposite each other along the Z direction, with the openings of the second groove 13 and the first groove 141 both facing the explosion-proof valve 80. The bottom walls of the second groove 13 and the first groove 141 are spaced apart from the explosion-proof valve 80 along the Z direction, forming a ventilation space between the insulating member 10 and the explosion-proof valve 80. When the pressure within the energy storage device 100 is excessive, the pressurized gas within the receiving chamber 51 enters the second groove 13 through the first vent 131 and then enters the first groove 141 through the second through-hole 114. In other words, the pressurized gas within the receiving chamber 51 enters the ventilation space through the first vent 131 and the second through-hole 114. The pressurized gas entering the ventilation space then impacts the explosion-proof valve 80, causing it to open and release pressure, thereby preventing explosion of the energy storage device 100 and improving its safety.

[0080] In this embodiment, by providing a plurality of first vent holes 131 and second vent holes 145 in the insulating member 10, pressurized gas generated within the receiving chamber 51 can smoothly pass through the first vent holes 131 and second vent holes 145 and enter between the insulating member 10 and the explosion-proof valve 80, thereby impacting the explosion-proof valve 80 and achieving the explosion-proof function of the energy storage device 100. Furthermore, in this embodiment, by providing the first inclined surface 142 and the second inclined surface 143 in the first groove 141, the volume of the first groove 141 can be increased, thereby forming a larger ventilation space between the insulating member 10 and the explosion-proof valve 80, facilitating the accumulation of pressurized gas at the first inclined surface 142 and the second inclined surface 143, thereby facilitating the opening and pressure relief of the explosion-proof valve 80, thereby improving the safety performance of the energy storage device 100.

[0081] like Figure 4 As shown, the injection hole 115 and the injection through hole are arranged opposite to each other along the Z direction and are interconnected. During the injection process of the energy storage device 100, the electrolyte flows into the receiving cavity 51 of the shell 50 through the injection through hole and the injection hole 115 to soak the electrode assembly 70.

[0082] It should be noted that due to the presence of a certain gap between the end cap 20 and the insulating member 10, when the electrolyte flows into the receiving cavity 51 through the liquid injection through-hole 26 and the liquid injection hole 115, some of the electrolyte will enter the gap between the end cap 20 and the insulating member 10, that is, it will flow along the first surface 111 of the insulating member 10. During the assembly and transportation of the energy storage device 100, the electrolyte inside the energy storage device 100 may shake due to transportation issues, which may cause the electrolyte to enter the gap between the insulating member 10 and the end cap 20.

[0083] During the injection process, part of the electrolyte that enters the gap between the end cover 20 and the insulating member 10 flows toward the first guide groove 17 , and part flows toward the first groove 141 .

[0084] Specifically, the electrolyte flowing towards the first flow guide groove 17 enters the first flow guide groove 17 and flows into the accommodation cavity 51 through the first flow guide hole 175. In the embodiment, by arranging the first flow guide groove 17 on the insulating piece 10 and arranging the first flow guide hole 175 in the first flow guide groove 17, the electrolyte flowing between the insulating piece 10 and the end cover 20 during the liquid injection process can flow into the accommodation cavity 51 through the first flow guide groove 17 and the first flow guide hole 175, thereby avoiding waste of the electrolyte. In the embodiment, by dividing the first flow guide groove 17 into a plurality of first sub-grooves 174 arranged along the Y direction, the electrolyte can flow into the accommodation cavity 51 from the plurality of first sub-grooves 174 and the first flow guide hole 175 arranged in each first sub-groove 174, thereby improving the speed of the electrolyte flowing into the accommodation cavity 51, i.e., improving the liquid injection speed, and also making the electrolyte more evenly distributed in the accommodation cavity 51, thereby improving the impregnation speed and impregnation effect of the electrode assembly 70.

[0085] The electrolyte flowing towards the first recess 141 flows into the first recess 141 through the first inclined surface 142 and flows into the interior of the energy storage device 100 through the second vent hole 145. Alternatively, part of the electrolyte flowing into the first recess 141 directly flows into the interior of the energy storage device 100 through the second vent hole 145, and part of the electrolyte flows into the second recess 13 from the first recess 141 and flows into the interior of the energy storage device 100 through the second vent hole 145. Alternatively, part of the electrolyte directly flows into the second recess 13 through the first surface 111 and flows into the interior of the energy storage device 100 through the second vent hole 145.

[0086] In the embodiment, by arranging the liquid injection hole 115 between the first flow guide groove 17 and the first recess 141, the electrolyte flowing between the insulating piece 10 and the end cover 20 during the liquid injection process can flow into the accommodation cavity 51 from the first flow guide groove 17 and also flow into the accommodation cavity 51 through the first vent hole 131 and the second vent hole 145, thereby further avoiding waste of the electrolyte. In the embodiment, by arranging the first inclined surface 142 in the first recess 141, the electrolyte on the first surface 111 can be guided to smoothly flow along the first inclined surface 142 to the first recess 141 and then flow into the accommodation cavity 51 through the first vent hole 131 and the second vent hole 145, thereby improving the backflow rate of the electrolyte.

[0087] Further, in the embodiment, by arranging the surface roughness of the first inclined surface 142 to be greater than the surface roughness of the first surface 111, i.e., by arranging the first inclined surface 142 as a rough surface, the flow speed of the electrolyte along the first inclined surface 142 can be reduced, thereby reducing the speed of the electrolyte flowing back to the accommodation cavity 51, and further reducing the impact force of the electrolyte on the electrode assembly 70, thereby avoiding damage to the electrode assembly 70.

[0088] When the energy storage device 100 shakes, the electrolyte entering the gap between the insulating member 10 and the end cover 20 flows into the receiving cavity 51 through the first flow channel 17, the second flow channel 18 and the first recess 141. Specifically, when the energy storage device 100 shakes, part of the electrolyte entering the gap between the insulating member 10 and the end cover 20 flows into the first flow channel 17 and flows into the receiving cavity 51 through the first flow hole 175; part of the electrolyte flows into the second flow channel 18 and flows into the receiving cavity 51 through the second flow hole 185; part of the electrolyte flows into the first recess 141 along the first inclined surface 142 and the second inclined surface 143, and flows into the receiving cavity 51 through the second vent hole 145 or / and the first vent hole 131.

[0089] In the embodiment, by arranging the first flow channel 17 and the second flow channel 18 on the opposite sides of the length direction of the insulating member 10, the speed of the electrolyte flowing back to the inside of the energy storage device 100 due to the shaking of the energy storage device 100 and entering the gap between the insulating member 10 and the end cover 20 can be improved, so that the waste of the electrolyte can be further avoided. In the embodiment, by arranging the first inclined surface 142 and the second inclined surface 143 in the first recess 141, the electrolyte entering the first surface 111 due to the shaking of the energy storage device 100 can smoothly flow along the first inclined surface 142 and the second inclined surface 143 to the first recess 141, and flow into the receiving cavity 51 through the first vent hole 131 and the second vent hole 145, so that the backflow rate of the electrolyte can be further improved.

[0090] Further, in the embodiment, by setting the surface roughness of the first inclined surface 142 and the second inclined surface 143 to be greater than the surface roughness of the first surface 111, that is, by setting the first inclined surface 142 and the second inclined surface 143 to be rough surfaces, the flow speed of the electrolyte along the first inclined surface 142 and the second inclined surface 143 can be reduced, that is, the speed of the electrolyte flowing to the first recess 141 can be reduced, so that the speed of the electrolyte flowing back to the receiving cavity 51 can be reduced, and further the impact force of the electrolyte on the electrode assembly 70 can be reduced, so that the damage of the electrode assembly 70 can be avoided.

[0091] In the embodiment, by setting the surface roughness of the first surface 111 to be greater than or equal to Ra0.8 and less than or equal to Ra12.5, that is, by setting the first surface 111 to be a smooth surface, the electrolyte on the first surface 111 can smoothly flow along the first surface 111 to the first flow channel 17, the second flow channel 18 and the first recess 141, and flow back to the inside of the energy storage device 100, so that part of the electrolyte can be avoided to remain on the first surface 111, and further the backflow rate of the electrolyte can be improved, and the waste of the electrolyte can be further avoided.

[0092] In the embodiment, the surface roughness of the second surface 112 is set to be greater than the surface roughness of the first surface 111, i.e., the second surface 112 is set to be a rough surface. In this way, the droplets of the electrolyte splashed to the rough second surface 112 can form a hanging half-sphere shape and fall back into the accommodation cavity 51 under slight vibration, so that the electrolyte can not stay on the insulating member 10 and not participate in the electrochemical reaction of the electrode assembly 70, thereby improving the utilization rate of the electrolyte and the service life of the energy storage device 100.

[0093] It should be further explained that during the manufacturing, transportation or use of the energy storage device 100, small welding slag, broken tab and other metal particles or impurities can also enter the accommodation cavity 51 through the first flow guide groove 17 and the second flow guide groove 18, i.e., enter the inside of the electrode assembly 70, which can cause short circuit of the energy storage device 100 and affect the safety performance of the energy storage device 100.

[0094] In the embodiment, the surface roughness of the first bottom wall 171 and the second bottom wall 181 is set to be greater than the surface roughness of the first surface 111, i.e., the first bottom wall 171 and the second bottom wall 181 are set to be rough surfaces. In this way, the metal particles or impurities falling into the first flow guide groove 17 can be blocked on the first bottom wall 171, and the metal particles or impurities falling into the second flow guide groove 18 can be blocked on the second bottom wall 181, so that the metal particles or impurities can be reduced to enter the inside of the electrode assembly 70, thereby improving the safety performance of the energy storage device 100.

[0095] Specifically, in the embodiment, by setting the first bottom wall 171 as a rough surface, the metal particles with a larger size among the metal particles falling into the first flow guide groove 17 are clamped in the rough particle gaps of the first bottom wall 171, so that the metal particles with a larger size can be blocked from entering the inside of the electrode assembly 70. Meanwhile, in the embodiment, by setting the first bottom wall 171 as a rough surface, the metal particles with a smaller size among the metal particles falling into the first flow guide groove 17 can flow along the rough particle gaps of the first bottom wall 171, so that the path of the metal particles with a smaller size flowing back to the inside of the electrode assembly 70 is prolonged, and the friction between the metal particles with a smaller size and the first bottom wall 171 is increased, so that the difficulty of the metal particles with a smaller size flowing back to the inside of the electrode assembly 70 is increased, that is, the metal particles with a smaller size are difficult to flow back to the inside of the electrode assembly 70. The metal particles with a smaller size flowing along the rough particle gaps of the first bottom wall 171 are partially clamped in the rough particle gaps of the first bottom wall 171, so that the metal particles entering the inside of the electrode assembly 70 can be reduced; part of the metal particles with a smaller size flow back to the inside of the electrode assembly 70 through the rough particle gaps of the first bottom wall 171, and since the sizes of these metal particles flowing back to the inside of the electrode assembly 70 are smaller, the possibility of short circuit in the electrode assembly 70 can be reduced, so that the safety performance of the energy storage device 100 can be improved. Wherein, the metal particles with a larger size refer to the metal particles with a size slightly larger than or equal to the size of the rough particle gaps of the first bottom wall 171. The metal particles with a smaller size refer to the metal particles with a size smaller than the size of the rough particle gaps of the first bottom wall 171.

[0096] At the same time, in this embodiment, by setting the second bottom wall 181 as a rough surface, the larger metal particles among the metal particles that fall into the second guide groove 18 are trapped in the gaps between the rough particles in the second bottom wall 181, thereby preventing the larger metal particles from entering the interior of the electrode assembly 70. At the same time, in this embodiment, by setting the second bottom wall 181 as a rough surface, the smaller metal particles among the metal particles that fall into the second guide groove 18 can flow along the gaps between the rough particles in the second bottom wall 181, thereby extending the path for the smaller metal particles to flow back to the interior of the electrode assembly 70 and increasing the friction between the smaller metal particles and the second bottom wall 181, thereby increasing the difficulty of the smaller metal particles to flow back to the interior of the electrode assembly 70. Smaller metal particles flowing along the coarse particle gaps of the second bottom wall 181 are partially trapped in the coarse particle gaps of the second bottom wall 181, thereby reducing the amount of metal particles entering the interior of the electrode assembly 70. Some smaller metal particles pass through the coarse particle gaps of the second bottom wall 181 and flow back into the interior of the electrode assembly 70. Since these metal particles flowing back into the interior of the electrode assembly 70 are smaller in size, the possibility of short circuits within the electrode assembly 70 is reduced, thereby improving the safety of the energy storage device 100. Larger metal particles herein refer to metal particles having a size slightly larger than or equal to the size of the coarse particle gaps of the second bottom wall 181, and smaller metal particles refer to metal particles having a size smaller than the size of the coarse particle gaps of the second bottom wall 181.

[0097] The insulating member 10 is formed by an injection molding process. In this embodiment, by setting the surface roughness of the first bottom wall 171 and the second bottom wall 181 to be greater than the surface roughness of the first surface 111, a small gap is formed between the first bottom wall 171 and the mold, and between the second bottom wall 181 and the mold, when the insulating member 10 is about to be separated from the movable mold surface of the molding die. This allows space to enter the gap, thereby improving the demolding convenience of the molding die and the insulating member 10, and improving the production efficiency and yield of the insulating member 10.

[0098] See also Figure 8 , Figure 8 yes Figure 5 The insulating member 10 is shown as a schematic structural diagram at another angle.

[0099] The insulating member 10 is further provided with a push point 101. The push point 101 includes a first push point 102 and a second push point 103. The first push point 102 is provided on the first bottom wall 171 and is recessed toward the second bottom surface 151. The second push point 103 is provided on the second bottom wall 181 and is recessed toward the third bottom surface 161. Figure 8 The shaded areas are all push points 101. This is just for the sake of distinction and does not represent the appearance of push points 101.

[0100] It should be noted that in the process of manufacturing the insulating part 10 through the injection molding process, molten plastic is generally injected into the molding mold first. After the plastic solidifies, a pin is used to eject the solidified plastic from the molding mold for demolding. The shape of the pit ejected by the pin on the plastic is the push point 101.

[0101] In this embodiment, the push point 101 is circular. In other embodiments, the push point 101 can also be square or other shapes. Exemplarily, the diameter of the push point 101 is about 7 mm.

[0102] There are multiple first push points 102. These multiple first push points 102 are spaced apart along the Y direction. Each first sub-groove 174 has at least one first push point 102 on its bottom wall. At least two first sub-grooves 174 have different numbers of first push points 102. For example, along the width direction of the insulating member 10, the number of first push points 102 on the first sub-groove 174 located in the middle is greater than the number of first push points 102 on the first sub-grooves 174 located on either side. In this embodiment, the bottom wall of the first sub-groove 174 located in the middle is provided with two first push points 102, i.e., the bottom wall of the second first sub-groove 1742 and the bottom wall of the third first sub-groove 1743 are each provided with two first push points 102. The bottom walls of the first sub-grooves 174 located on either side are provided with one first push point 102, i.e., the bottom walls of the first first sub-groove 1741 and the bottom wall of the fourth first sub-groove 1744 are each provided with one first push point 102.

[0103] The first push point 102 provided in the first first sub-groove 1741 is located between the two first guide holes 175 in the bottom wall of the first first sub-groove 1741. The two first push points 102 provided in the second first sub-groove 1742 are located on opposite sides of the two first guide holes 175 in the bottom wall of the second first sub-groove 1742. That is, in the second first sub-groove 1742, the two first guide holes 175 are located between the two first push points 102. In the third first sub-groove 1743, the two first guide holes 175 are located between the two first push points 102. In the fourth first sub-groove 1744, the first push point 102 is located on the side of the two first guide holes 175 facing away from the third first sub-groove 1743. Alternatively, the first push point 102 provided in the fourth first sub-groove 1744 is located between the two first guide holes 175 in the bottom wall of the fourth first sub-groove 1744.

[0104] In the embodiment, the first pushing points 102 are asymmetrically arranged with respect to the first center line P1. That is, the first pushing points 102 on one side of the first center line P1 are not coincident with the first pushing points 102 on the other side of the first center line P1 when the first pushing points 102 on one side of the first center line P1 are mirrored to the other side of the first center line P1. The first center line P1 is the center line of the insulating member 10 in the Y direction. The first center line P1 is parallel to the X direction, and the distance from the first center line P1 to the opposite edges of the insulating member 10 in the Y direction is equal.

[0105] In the Y direction and in the direction away from the first center line P1, the first pushing points 102 arranged in the second first sub-groove 1742 are respectively a first first pushing point 1021 and a second first pushing point 1022, and the first pushing points 102 arranged in the third first sub-groove 1743 are respectively a third first pushing point 1023 and a fourth first pushing point 1024. In the embodiment, the first first pushing point 1021 and the third first pushing point 1023 are arranged in the Y direction. The third first pushing point 1023 is located on the side of the first first pushing point 1021 close to the explosion-proof boss 12. The second first pushing point 1022 and the fourth first pushing point 1024 can also be symmetrically arranged with respect to the first center line P1, or can be asymmetrically arranged.

[0106] Please continue to refer to Figure 8 The second pushing points 103 are a plurality of. The plurality of second pushing points 103 are arranged in the Y direction. At least one second pushing point 103 is arranged on the groove bottom wall of each second sub-groove 184. The number of second pushing points 103 arranged by at least two second sub-grooves 184 is different. For example, in the width direction of the insulating member 10, the number of second pushing points 103 arranged by the second sub-groove 184 located in the middle position is greater than the number of second pushing points 103 arranged by the second sub-groove 184 located on both sides. In the embodiment, the groove bottom wall of the second second sub-groove 1842 and the third second sub-groove 1843 is provided with two second pushing points 103, and the groove bottom wall of the first second sub-groove 1841 and the fourth second sub-groove 1844 is provided with one second pushing point 103.

[0107] The second pushing point 103 arranged in the first second sub-groove 1841 is located between the two second flow guide holes 185 on the groove bottom wall of the first second sub-groove 1841. In the second second sub-groove 1842, the two second flow guide holes 185 are located between the two second pushing points 103. In the third second sub-groove 1843, the two second flow guide holes 185 are located between the two second pushing points 103. In the fourth second sub-groove 1844, the second pushing point 103 is located on the side away from the third second sub-groove 1843 of the two second flow guide holes 185.

[0108] In the embodiment, the second pushing points 103 are symmetrically arranged about the second center line P2 relative to the first pushing points 102. The second center line P2 is the center line of the insulating part 10 in the X direction. The second center line P2 is parallel to the Y direction, and the distance between the opposite edges of the second insulating part 10 in the Y direction is equal.

[0109] The plurality of second pushing points 103 are asymmetrically arranged about the first center line P1. In the Y direction and in the direction away from the first center line P1, the second pushing points 103 arranged in the second second sub-groove 1842 are respectively the first second pushing point 1031 and the second second pushing point 1032, and the second pushing points 103 arranged in the third second sub-groove 1843 are respectively the third second pushing point 1033 and the fourth second pushing point 1034. In the embodiment, the first second pushing point 1031 and the third second pushing point 1033 are arranged in the Y direction, and the third second pushing point 1033 is located on the side of the first second pushing point 1031 close to the explosion-proof boss 12. The second second pushing point 1032 and the fourth second pushing point 1034 can also be symmetrically arranged about the first center line P1, or can be asymmetrically arranged.

[0110] It should be noted that when the insulating part 10 is about to be separated from the moving die surface of the forming mold, the gas enters the edge position first in the demolding process. In the embodiment, by arranging the pushing points 101 on the opposite sides of the insulating part 10 in the length direction, that is, arranging the first pushing points 102 on the first flow guide groove 17 and arranging the second pushing points 103 on the second flow guide groove 18, air can enter between the insulating part 10 and the forming mold in the demolding process, thereby facilitating the demolding of the insulating part 10 and simplifying the forming process of the insulating part 10.

[0111] Further, in the width direction of the insulating part 10, the adhesion between the insulating part 10 located at the center position and the forming mold is greater and the adhesion degree is stronger. In the embodiment, by setting the number of first pushing points 102 arranged on the first sub-groove 174 located at the middle position to be greater than the number of first pushing points 102 arranged on the first sub-groove 174 located at the two sides, and setting the number of second pushing points 103 arranged on the second sub-groove 184 located at the middle position to be greater than the number of second pushing points 103 arranged on the second sub-groove 184 located at the two sides, the demolding force received by the insulating part 10 located at the center position in the width direction is greater in the demolding process, thereby further facilitating the demolding of the insulating part 10 and further simplifying the forming process of the insulating part 10.

[0112] In the embodiment, by symmetrically arranging the first pushing points 102 and the second pushing points 103 about the second center line P2, the force on the opposite sides of the insulating part 10 in the length direction is more uniform in the demolding process of the insulating part 10, thereby making the insulating part 10 more easily demolded, and the deformation and material dropping of the insulating part 10 can be reduced or even avoided.

[0113] Furthermore, in this embodiment, by arranging the plurality of first push points 102 asymmetrically about the first center line P1 and the plurality of second push points 103 asymmetrically about the first center line P1, a foolproof identification function can be achieved, facilitating visual CCD (Charge Coupled Device) identification and detection of the insulating member 10 during assembly of the insulating member 10, thereby preventing the insulating member 10 from being deflected or reversed during assembly. This can simplify the production process of the energy storage device 100 and improve the production efficiency of the energy storage device 100.

[0114] In one embodiment, a first protrusion (not shown) is provided within the first guide groove 17. The first protrusion is disposed on the bottom wall of the first guide groove 17 and surrounds the outer periphery of the first guide hole 175. In this embodiment, there are multiple first protrusions. The multiple first protrusions are provided in a one-to-one correspondence with the multiple first guide holes 175, with one first protrusion being provided on the outer periphery of each first guide hole 175.

[0115] The height of the first protrusion may be consistent with or substantially the same as the height of the rough particles on the first bottom wall 171, or the height of the first protrusion may be slightly greater than the height of the rough particles on the first bottom wall 171. For example, the first protrusion may be formed simultaneously with the rough surface of the first bottom wall 171 by grinding or other processes, or the first protrusion may be formed after the rough surface of the first bottom wall 171 is formed, or the first protrusion may be formed before the rough surface of the first bottom wall 171 is formed.

[0116] In this embodiment, by providing a first protrusion around the first guide hole 175 on the bottom wall of the first guide groove 17, it is possible to further block metal particles that fall into the first guide groove 17, and further prevent the metal particles that fall into the first guide groove 17 from flowing into the interior of the electrode assembly 70 through the first guide hole 175, thereby improving the safety performance of the energy storage device 100.

[0117] A second protrusion (not shown) is provided in the second guide groove 18. The second protrusion is provided on the bottom wall of the second guide groove 18 and is arranged around the outer periphery of the second guide hole 185. In this embodiment, there are multiple second protrusions. The multiple second protrusions are arranged in a one-to-one correspondence with the multiple second guide holes 185, and one second protrusion is arranged corresponding to the outer periphery of each second guide hole 185. The height of the second protrusion can be consistent with or approximately the same as the height of the coarse particles on the second bottom wall 181, or the height of the second protrusion can be slightly greater than the height of the coarse particles on the second bottom wall 181.

[0118] In the embodiment, the second protrusion arranged around the second flow hole 185 at the bottom wall of the second flow groove 18 can further block the metal particles falling into the second flow groove 18, and further prevent the metal particles falling into the second flow groove 18 from flowing into the inside of the electrode assembly 70 through the second flow hole 185, thereby improving the safety performance of the energy storage device 100.

[0119] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples; the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the field, the specific implementation manners and application ranges will be changed according to the idea of the present application; in conclusion, the content of the specification should not be understood as the limitation of the present application.

Claims

1. An insulating member for an energy storage device, characterized in that: The insulating member includes a first surface and a second surface, wherein the first surface and the second surface are arranged opposite to each other along a thickness direction of the insulating member; The insulating member is provided with a guide groove, the opening of the guide groove is located on the first surface, the bottom wall of the guide groove is provided with a guide hole, and the guide hole penetrates the bottom wall of the guide groove; the surface roughness of the bottom wall of the guide groove is greater than the surface roughness of the first surface; There are at least two guide grooves, two of which are respectively a first guide groove and a second guide groove, and the first guide groove and the second guide groove are spaced apart along the length direction of the insulating member and are respectively located at two opposite edge regions of the insulating member in the length direction; The bottom wall of the first guide groove is provided with a first guide hole, and the first guide hole passes through the bottom wall of the first guide groove; the bottom wall of the second guide groove is provided with a second guide hole, and the second guide hole passes through the bottom wall of the second guide groove; the surface roughness of the bottom wall of the first guide groove and the surface roughness of the bottom wall of the second guide groove are both greater than the surface roughness of the first surface.

2. The insulating member according to claim 1, wherein The insulating member is provided with a first groove, the opening of the first groove is located on the first surface, and the first groove is located between the first guide groove and the second guide groove; the bottom wall of the first groove is provided with a first vent hole, and the first vent hole passes through the bottom wall of the first groove; The first groove includes a first inclined surface and a second inclined surface, and the first inclined surface and the second inclined surface are arranged opposite to each other along the length direction of the insulating member; along the length direction of the insulating member, and from the first inclined surface to the second inclined surface, the distance from the first inclined surface to the first surface along the thickness direction of the insulating member gradually increases; along the length direction of the insulating member, and from the second inclined surface to the first inclined surface, the distance from the second inclined surface to the first surface along the thickness direction of the insulating member gradually increases.

3. The insulating member according to claim 2, wherein: The surface roughness of the first inclined surface is greater than the surface roughness of the first surface, or / and the surface roughness of the second inclined surface is greater than the surface roughness of the first surface.

4. The insulating member according to claim 1, wherein The surface roughness of the bottom wall of the guide groove is greater than or equal to Ra0.8 and less than or equal to Ra12.5, and the surface roughness of the first surface is greater than or equal to Ra0.02 and less than or equal to Ra1.

6.

5. The insulating member according to any one of claims 1 to 4, characterized in that: The surface roughness of the second surface is greater than the surface roughness of the first surface.

6. The insulating member according to any one of claims 1 to 4, characterized in that: A plurality of first pushing points are provided on the bottom wall of the first guide groove, and the plurality of first pushing points are arranged at intervals along the width direction of the insulating member.

7. The insulating member according to claim 6, wherein: The insulating member has a first center line, which is parallel to the length direction of the insulating member, and the distances from the first center line to the two opposite edges of the insulating member in the width direction are equal; multiple first pushing points are asymmetrically arranged about the first center line.

8. The insulating member according to claim 6, wherein: The first guide groove includes a plurality of first sub-grooves, the plurality of first sub-grooves are spaced apart along the width direction of the insulating member, and the bottom wall of each first sub-groove is provided with at least one first guide hole, and the first guide hole penetrates the bottom wall of the first sub-groove; The bottom wall of each first sub-groove is provided with at least one first pushing point, and the number of the first pushing points provided on at least two first sub-grooves is different.

9. The insulating member according to claim 7, wherein: The bottom wall of the second guide groove is provided with a plurality of second push points, and the plurality of second push points are arranged at intervals along the width direction of the insulating member; The insulating member has a second center line, which is parallel to the width direction of the insulating member, and the distances from the second center line to the two opposite edges of the insulating member in the length direction are equal; the second pushing point and the first pushing point are symmetrically arranged about the second center line.

10. The insulating member according to claim 2, wherein The insulating member is provided with a first through hole, a liquid injection hole, and a second through hole, wherein the first through hole, the liquid injection hole, and the second through hole are spaced apart along the length direction of the insulating member and pass through the first surface and the second surface along the thickness direction of the insulating member; The injection hole is provided between the first groove and the first guide groove, the first through hole is provided between the injection hole and the first guide groove, and the second through hole is provided between the first groove and the second guide groove; The first through hole is used for the positive electrode of the energy storage device to pass through, and the second through hole is used for the negative electrode of the energy storage device to pass through; or, the first through hole is used for the negative electrode of the energy storage device to pass through, and the second through hole is used for the positive electrode of the energy storage device to pass through.

11. An end cap assembly, characterized in that: It comprises an end cover and the insulating member according to any one of claims 1 to 10, wherein the insulating member and the end cover are stacked and fixedly connected along the thickness direction of the end cover assembly, and the first surface faces the end cover.

12. The end cap assembly according to claim 11, wherein: The end cap is further provided with a liquid injection through hole and an explosion-proof hole, wherein the explosion-proof hole and the liquid injection hole are spaced apart along the length direction of the insulating member; the liquid injection through hole is arranged opposite to and communicates with the liquid injection hole of the insulating member; The end cover assembly also includes an explosion-proof valve, which is arranged in the explosion-proof hole and fixedly connected to the inner wall of the explosion-proof hole; the insulating member is provided with a first groove; along the thickness direction of the end cover assembly, the explosion-proof valve is arranged opposite to the first groove and is spaced apart from the bottom wall of the first groove.

13. An energy storage device, characterized in that: It comprises a shell, an electrode assembly and an end cover assembly as described in claim 11 or 12, the shell having an opening, the shell being provided with a receiving cavity, the receiving cavity being communicated with the opening; the electrode assembly being arranged in the receiving cavity, the end cover assembly covering the opening, the second surface facing the receiving cavity, and the end cover assembly being fixedly connected to the shell.

14. An electrical device, characterized in that: The energy storage device comprises the energy storage device as claimed in claim 13, wherein the energy storage device is used to supply power to the electrical equipment.

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