Insulating part, end cover assembly, energy storage device and electric equipment

Abstract

The invention discloses an insulating part, an end cover assembly, an energy storage device and electric equipment. The insulating part comprises a first surface and a second surface, and the first surface and the second surface are oppositely arranged in the thickness direction of the insulating part. The insulating part is provided with a diversion trench, an opening of the diversion trench is located in the first surface, and a diversion hole is formed in the bottom wall of the diversion trench and penetrates through the bottom wall of the diversion trench. The surface roughness of the groove bottom wall of the flow guide groove is larger than that of the first surface. The insulating part provided by the invention can prevent the metal particles from entering the battery cell through the insulating part to cause short circuit of the energy storage device, and the safety performance of the energy storage device can be improved.

Description

Technical Field

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

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can be used again by recharging the active materials after the battery is discharged. Secondary batteries include insulating parts for insulating the end caps and poles. The insulating parts are generally provided with guide grooves facing the end caps so that the electrolyte entering the gap between the end caps and the insulating parts can flow back to the battery cells. However, metal particles such as welding slag, broken tabs, or other impurities may also enter the battery cells through the guide grooves, which will cause a short circuit in the battery, thereby affecting the safety performance of the battery. Summary of the invention

[0003] The present application provides an insulating member, an end cover assembly, an energy storage device and an electrical equipment, which can prevent metal particles from entering the battery cell through the insulating member and causing a short circuit in the energy storage device, thereby improving the safety performance of the energy storage device.

[0004] In a first aspect, the present application provides an insulating member for an energy storage device. The insulating member includes a first surface and a second surface, and the first surface and the second surface are arranged opposite to each other along the 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, and the bottom wall of the guide groove is provided with a guide hole, and the guide hole is along 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.

[0005] In a possible implementation, there are at least two guide grooves, and two of the at least two guide grooves are respectively a first guide groove and a second guide groove, and the first guide groove and the second guide groove are arranged at intervals along the length direction of the insulating member, and are respectively located at two opposite edge areas in the length direction of the insulating member. The bottom wall of the first guide groove is provided with a first guide hole, and the first guide hole penetrates 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 penetrates 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.

[0006] In a possible implementation, 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 groove bottom wall of the first groove is provided with a first vent hole, and the first vent hole passes through the groove 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.

[0007] In a possible implementation manner, 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.

[0008] In a possible implementation manner, 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.

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

[0010] In a possible implementation manner, 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.

[0011] In a possible implementation, the insulating member has a first center line, the first center line is parallel to the length direction of the insulating member, and the distances from the first center line to two opposite edges of the insulating member in the width direction are equal. A plurality of the first push points are asymmetrically arranged about the first center line.

[0012] In a possible implementation manner, the first flow 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, the groove bottom wall of each first sub-groove is provided with at least one first flow guide hole, and the first flow guide hole penetrates the groove bottom wall of the first sub-groove. The groove bottom wall of each first sub-groove is provided with at least one first push point, and the number of the first push points provided in at least two first sub-grooves is different.

[0013] In a possible implementation manner, 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, the second center line is parallel to the width direction of the insulating member, and the distances from the second center line to two opposite edges in the length direction of the insulating member are equal; the second push points and the first push points are arranged symmetrically about the second center line.

[0014] In a possible implementation, the insulating member is provided with a first through hole, a liquid injection hole, and a second through hole, the first through hole, the liquid injection hole, and the second through hole are arranged at intervals along the length direction of the insulating member, and penetrate the first surface and the second surface along the thickness direction of the insulating member. The liquid injection hole is provided between the first groove and the first guide groove, the first through hole is provided between the liquid 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 pole of the energy storage device to pass through, and the second through hole is used for the negative pole of the energy storage device to pass through; or, the first through hole is used for the negative pole of the energy storage device to pass through, and the second through hole is used for the positive pole of the energy storage device to pass through.

[0016] In a second aspect, the present application provides an end cap assembly, which includes 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 a possible implementation, the end cover 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 connected to the liquid injection hole of the insulating member. The end cover assembly further 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. Along the thickness direction of the end cover assembly, the explosion-proof valve is arranged opposite to 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 shell, an electrode assembly, and an end cap assembly. The shell has an opening, and the shell is provided with a receiving cavity, and the receiving cavity is connected to the opening. The electrode assembly is arranged in 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 shell.

[0019] In a fourth aspect, the present application provides an electric device, wherein the electric device comprises the energy storage device, and the energy storage device is used to supply power to the electric device.

[0020] In the present application, by setting a guide groove on the insulating member, and setting the surface roughness of the groove bottom wall of the guide groove to be greater than the surface roughness of the first surface, the metal particles and other impurities that fall into the guide groove can be blocked at the groove bottom wall of the guide groove, thereby reducing or even avoiding the metal particles or other impurities from entering the interior of the electrode assembly along the guide groove and the guide hole, thereby improving the safety performance of the energy storage device. For example, by setting the surface roughness of the groove bottom wall of the guide groove to be greater than the surface roughness of the first surface, the larger-sized metal particles among the metal particles that fall into the guide groove are stuck in the rough particle gaps of the groove bottom wall of the guide groove. At the same time, by setting the surface roughness of the groove bottom wall of the guide groove to be greater than the surface roughness of the first surface, the path of the smaller-sized metal particles among the metal particles that fall into the guide groove to flow back to the interior of the energy storage device can be longer, and the friction between the smaller metal particles and the first bottom wall can be increased, thereby increasing the difficulty of the smaller-sized metal particles among the metal particles that fall into the guide groove to flow back to the interior of the energy storage device, thereby reducing or even avoiding short circuits inside the energy storage device.

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

[0022] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative work.

[0023] Figure 1 This is an application scenario diagram of an electrical device provided in an embodiment of the present application;

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

[0025] Figure 3 yes Figure 2 A schematic diagram of the exploded structure of the energy storage device shown;

[0026] Figure 4 yes Figure 2 A schematic diagram of the exploded structure of the end cap assembly in the energy storage device shown;

[0027] Figure 5 yes Figure 4 A schematic diagram of the structure of the insulating member in the end cap assembly shown;

[0028] Figure 6 yes Figure 5 A schematic diagram of the structure of the insulating member shown at another angle;

[0029] Figure 7 yes Figure 5 A schematic diagram of a partial cross-sectional structure of the insulating member shown along the AA direction;

[0030] Figure 8 yes Figure 5 A schematic structural diagram of the insulating member shown at another angle.

[0031] Reference numerals: 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 chamber 51; electrode assembly 70; pole core 71; positive pole ear 711; negative pole ear 712; first connecting member 61; second connecting member 62; end cap assembly 1; end cap 20; first upper plastic 31; second upper plastic 32; insulating member 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; injection through hole 26; insulating member body 11; first surface 111; second surface 112; first through hole 113; second through hole 114; injection hole 115; explosion-proof boss 12; first bottom surface 121; second groove 13; boss 14; first groove 141; first inclined surface 142; second inclined surface 143; connecting surface 144; first vent hole 131; second vent hole 145; first boss 15; second bottom surface 151 ; second boss 16; third bottom surface 161; first 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 guide hole 175; second 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; the third second sub-groove 1843; the fourth second sub-groove 1844; the second guide hole 185; the push point 101; the first push point 102; the first first push point 1021; the second first push point 1022; the third first push point 1023; the fourth first push point 1024; the second push point 103; the first second push point 1031; the second second push point 1032; the third second push point 1033; the fourth second push point 1034; the first center line P1; the second center line P2. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, to achieve the goal of carbon neutrality, the main way to generate green electricity is to develop green energy such as photovoltaics and wind power to replace fossil energy. At present, the generation of green electricity generally relies on photovoltaics, wind power, water potential, etc., while wind and solar energy generally have strong intermittent and volatile problems, which will cause instability in the power grid, insufficient electricity during peak hours, too much electricity during low hours, and unstable voltage will also cause damage to electricity. Therefore, it may cause "wind and light abandonment" problems due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, we must rely on energy storage. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then the energy is converted into electrical energy and released when needed. Simply put, energy storage is like a large "power bank". When photovoltaic and wind energy are sufficient, electrical energy is stored, and the stored electricity is released when needed.

[0034] Taking electrochemical energy storage as an example, this solution provides an energy storage device, which has a group of chemical batteries in it. The chemical elements in the chemical batteries are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage media. Simply put, the electricity generated by wind and solar energy is stored in chemical batteries. When the use of external electricity reaches its peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0035] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0036] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0037] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0038] See also Figure 1 , Figure 1 This is an application scenario diagram of an electric device provided in an embodiment of the present application. The present application embodiment takes the household energy storage scenario in user-side energy storage as an example for explanation, and the energy storage device of the present application is not limited to the household energy storage scenario.

[0039] The present application provides a household energy storage system 1000, which includes 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) (industrial and commercial side), etc. and an energy storage device 100. The energy storage system 1000 also includes 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 period of low electricity prices. The energy storage device is used to store the electric energy and supply it to the base station and the industrial and commercial side for use when the electricity price is peak, or to supply power when the power grid is off / out of power. 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 it to the base station and the industrial and commercial side for use when the electricity price is peak, or to supply power when the power grid is off / out of power. Among them, the transmission of electric energy can be transmitted using high-voltage cables.

[0040] Among them, the energy storage cabinet 230 can be understood as an electrical device. The energy storage device can also be used in the form of energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes, etc., and the energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment contain energy storage devices. The above-mentioned energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment containing energy storage devices can be understood as electrical equipment.

[0041] It is understandable that the energy storage device may include but is not limited to a single cell, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device provided in the embodiment of the present application may be but is not limited to the listed products, and may also be other application forms. The embodiment of the present application does not strictly limit the application form of the energy storage device. The embodiment of the present application only takes the energy storage device as a multi-core battery as an example for explanation.

[0042] See also Figure 2 and Figure 3 , Figure 2 is a schematic diagram of the structure of the energy storage device 100 provided in this application, Figure 3 yes Figure 2 A schematic diagram of the exploded structure of the energy storage device 100 is shown.

[0043] For the convenience of description, in this 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; 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 cap assembly 1, an electrode assembly 70, an electrolyte, a first connector 61 and a second connector 62. The shell 50 is provided with a receiving chamber 51, and the opening of the receiving chamber 51 is located on one side of the shell 50 in the height direction. The electrode assembly 70 and the electrolyte are located in the receiving chamber 51, and the electrode assembly 70 is immersed 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 pole ear 711 and a negative pole ear 712. The end cap assembly 1 is installed on the opening side of the shell 50 and is fixedly connected to the shell 50 to close the receiving chamber 51. The first connector 61 is connected between the positive pole ear 711 and the positive pole column of the end cap assembly 1, and the second connector 62 is connected between the negative pole ear 712 and the negative pole column of the end cap assembly 1.

[0045] In this embodiment, the outer side of the electrode assembly 70 is also coated with an insulating film (not shown) to protect the electrode core 71 and prevent the electrode core 71 from being scratched. The insulating film is coated on the outer surface of the electrode assembly 70, and the side of the insulating film is hot-melt bonded to the end cap assembly 1.

[0046] See also Figure 4 , Figure 4 yes Figure 2 A schematic diagram of the exploded structure of the end cover assembly 1 in the energy storage device 100 is shown.

[0047] The end cap assembly 1 includes an end cap 20, a first upper plastic 31, a second upper plastic 32, an insulating member 10, a first pole 41, a second pole 42 and an explosion-proof valve 80. In this embodiment, the end cap 20 is a rectangular thin plate. In other embodiments, the end cap 20 may also be a circular plate, an elliptical plate or other special-shaped plates. In this embodiment, the end cap 20 is a light aluminum part. The end cap 20 includes a top surface 21 and a back surface 22. The top surface 21 and the back surface 22 are arranged opposite to each other along the Z direction. The end cap 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 cap 20, that is, 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 arranged in sequence. Furthermore, the first pole through hole 23 , the 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 provided in the first pole through hole 23. The first upper plastic 31 is sleeved on the outer circumference of the first pole 41 and is provided on the top surface 21 of the end cover 20, and the first upper plastic 31 is fixedly connected to 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 provided in the second pole through hole 24. The second upper plastic 32 is sleeved on the outer circumference of the second pole 42 and is provided on the top surface 21 of the end cover 20, and the second upper plastic 32 is fixedly connected to the end cover 20. The second pole 42 is insulated from the end cover 20 by the second upper plastic 32. In this 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 may also be a negative pole, and the second pole 42 may be a positive pole.

[0049] The explosion-proof valve 80 is installed in the explosion-proof hole 25 and fixedly connected to the end cover 20. Exemplarily, the explosion-proof valve 80 is welded to the inner wall of the explosion-proof hole 25. When the pressure inside the energy storage device 100 is too high, the explosion-proof valve 80 will automatically open to release the pressure to prevent the energy storage device 100 from exploding, thereby improving the safety performance of the energy storage device 100.

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

[0051] Please combine Figure 5 and Figure 6 , Figure 5 yes Figure 4 The schematic diagram of the structure of the insulating member 10 in the end cover assembly 1 is shown, Figure 6 yes Figure 5 The schematic diagram of the structure of the insulating member 10 is shown at another angle.

[0052] The insulating member 10 is the lower plastic in the end cap assembly 1. In this embodiment, the insulating member 10 is roughly in the shape of a rectangular sheet. The insulating member 10 is made of an insulating material. Exemplarily, the insulating member 10 is made of plastic or rubber, or the insulating member 10 can also be made of other insulating materials. The insulating member 10 is stacked with the end cap 20 along the Z direction and is fixedly connected to the end cap 20.

[0053] The insulating member 10 includes an insulating member body 11. The insulating member body 11 includes a first surface 111 and a second surface 112. The first surface 111 and the second surface 112 are disposed opposite to each other along the thickness direction of the insulating member body 11, that is, disposed opposite to each other along the Z direction. The first surface 111 faces the end cap 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 flat, and may also be slightly curved, which is not specifically limited here.

[0054] Among them, 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, which is formed by a plurality of recesses and a plurality of protrusions arranged in an interlaced manner. Exemplarily, 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 performing rough grinding on the second surface 112. Alternatively, rough grinding can be performed on a position corresponding to the second surface 112 on a molding die for forming the insulating part 10, so that the second surface 112 of the insulating part 10 obtained during the injection molding process has a greater surface roughness.

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

[0056] The insulating 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 insulating member body 11. The first through hole 113 is arranged corresponding to the first pole through hole 23. 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 is arranged corresponding to the second pole through hole 24. 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.

[0057] The insulating body 11 is also provided with a liquid injection hole 115. The liquid injection hole 115 is arranged at intervals from the first through hole 113 and the second through hole 114, and the liquid injection hole 115 passes through the first surface 111 and the second surface 112 along the thickness direction of the insulating body 11. In this 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 that is away from the second through hole 114, or the liquid injection hole 115 is arranged on the side of the second through hole 114 that is away from the first through hole 113, or the liquid injection hole 115 is arranged side by side and at intervals with 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 receiving cavity 51 of the shell 50 through the liquid injection through hole and the liquid injection hole 115 to infiltrate the electrode assembly 70.

[0058] The insulating member 10 further includes an explosion-proof boss 12. The explosion-proof boss 12 is disposed in the middle of the length direction of the insulating member body 11 and is located between the injection hole 115 and the second through hole 114. The explosion-proof boss 12 is disposed on the second surface 112 and protrudes from the second surface 112. The explosion-proof boss 12 includes 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 insulating 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 toward the explosion-proof boss 12. The second groove 13 is substantially rectangular and is arranged along the Y direction.

[0060] Please combine Figure 7 , Figure 7 yes Figure 5 The schematic diagram of the partial cross-section structure of the insulating member 10 along the AA direction is shown.

[0061] A boss 14 is provided in the second groove 13. The boss 14 is located in the middle area of ​​the second groove 13 in the Y direction. The boss 14 is connected to the two opposite side walls of the second groove 13 in the X direction, and is spaced apart from the two opposite side walls 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 toward the groove bottom wall direction of the second groove 13, that is, recessed toward 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 along the X direction, and together form the inner wall of the first groove 141. One end of the first inclined surface 142 facing away from the connecting surface 144 is connected to the first surface 111, and one end of the second inclined surface 143 facing away from the connecting surface 144 is connected to the first surface 111. The first inclined surface 142 and the second inclined surface 143 are disposed opposite to each other along the X direction.

[0062] Among them, the first inclined surface 142 and the second inclined surface 143 are both inclined surfaces. The angles between the first inclined surface 142 and the Z direction are both greater than 0 degrees and less than 90 degrees, and the angles between the first inclined surface 142 and the X direction are both greater than 0 degrees and less than 90 degrees. Along the length direction of the insulating member 10, and from the first inclined surface 142 to the second inclined surface 143, that is, along the positive direction of the X axis, the distance from the first inclined surface 142 to the first surface 111 along the thickness direction (Z direction) of the insulating member 10 gradually increases. The angles between the second inclined surface 143 and the Z direction are both greater than 0 degrees and less than 90 degrees, and the angles between the second inclined surface 143 and the X direction are both greater than 0 degrees and less than 90 degrees. Along the length direction of the insulating member 10, and from the second inclined surface 143 to the first inclined surface 142, that is, along the negative direction of the X axis, the distance from the second inclined surface 143 to the first surface 111 along the thickness direction (Z direction) of the insulating member 10 gradually increases. That is, along the direction from the 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 along the X direction gradually decreases, and the size of the first groove 141 along 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. Towards the connecting surface 144, the slope of the first inclined surface 142 gradually decreases, that is, the first inclined surface 142 becomes more and more gentle. Towards the connecting surface 144, the slope of the second inclined surface 143 gradually decreases, that is, the second inclined surface 143 becomes more and more gentle. In other embodiments, the first inclined surface 142 may also be an equi-aligned inclined surface or a convex inclined surface, and the second inclined surface 143 may also be an equi-aligned inclined surface or a convex inclined surface. Among them, "equi-aligned inclined surface" refers to an inclined surface with a substantially uniform slope along the extending direction of the inclined surface, and "convex inclined surface" refers to an inclined surface with a gradually increasing slope along the downhill direction.

[0064] Among them, the surface roughness of the first bevel 142 and the second bevel 143 are both less than the surface roughness of the first surface 111. That is, the first bevel 142 and the second bevel 143 are both rough surfaces. The first bevel 142 and the second bevel 143 are both non-flat surfaces, the first bevel 142 is formed by a plurality of recesses and a plurality of protrusions arranged in a staggered manner, and the second bevel 143 is formed by a plurality of recesses and a plurality of protrusions arranged in a staggered manner. Exemplarily, the surface roughness of the first bevel 142 is greater than or equal to Ra0.8 and less than or equal to Ra12.5, and the surface roughness of the second bevel 143 is greater than or equal to Ra0.8 and less than or equal to Ra12.5. Specifically, the surface roughness of the first bevel 142 and the second bevel 143 can be increased by performing rough grinding on the first bevel 142 and the second bevel 143. Alternatively, the positions corresponding to the first bevel 142 and the second bevel 143 may be roughly polished on the molding die for forming the insulating member 10 so that the first bevel 142 and the second bevel 143 of the insulating member 10 obtained during the injection molding process have greater surface roughness.

[0065] Please continue reading Figure 5 and Figure 6 The insulating member 10 is further provided with a first vent hole 131 and a second vent hole 145. The first vent hole 131 is provided on the bottom wall of the second groove 13 and passes through the first bottom surface 121. There are a plurality of first vent holes 131. 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 may also be a square hole or other special-shaped holes.

[0066] The second air vent 145 is provided on the inner wall of the first groove 141 and passes through the first bottom surface 121. There are a plurality of second air vents 145, and the plurality of second air vents 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 insulating member 10, and can reduce or even prevent the deformation of the insulating member 10. In the present embodiment, the second air vent 145 is a strip hole, and the plurality of second air vents 145 are arranged in a ring shape, roughly forming a ring structure in which one circle is within another. In other embodiments, the second air vent 145 may also be a round hole, a square hole or other special-shaped holes.

[0067] The insulating member 10 further includes a first boss 15 and a second boss 16. The first boss 15 and the second boss 16 are respectively disposed on opposite sides of the length direction of the body. The first boss 15 and the second boss 16 are both disposed on the second surface 112 and protrude from the second surface 112. The first boss 15 includes 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 insulating member 10 is provided with a guide groove. The opening of the guide groove is located on the first surface 111. 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. There are at least two guide grooves, and the bottom wall of each guide groove is provided with a guide hole. In this embodiment, there are two guide grooves. The two guide grooves are respectively a first guide groove 17 and a second guide groove 18. The first guide groove 17 and the second guide groove 18 are arranged at intervals along the length direction of the insulating member 10, and are respectively located at two opposite edge areas in the length direction of the insulating member 10.

[0069] Among them, the opening of the first guide groove 17 is located on the first surface 111 and is recessed toward the first boss 15. In this embodiment, the first guide groove 17 is roughly rectangular and is arranged along the Y direction. The first 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 to the opening of the first guide groove 17. It can be understood that the first bottom wall 171 is the bottom wall of the first guide groove 17.

[0070] Among them, 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 recesses and a plurality of protrusions that are staggered. Exemplarily, 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 performing rough grinding on the first bottom wall 171. Alternatively, rough grinding can be performed on a position corresponding to the first bottom wall 171 on a molding mold for forming the insulating part 10, so that the first bottom wall 171 of the insulating part 10 obtained during the injection molding process has a greater surface roughness.

[0071] A plurality of first partitions 173 are provided in the first guide groove 17. The plurality of first partitions 173 are arranged in sequence and spaced apart along the Y direction, and are connected to the first bottom wall 171 and the first side wall 172. The plurality of first partitions 173 divide the first guide groove 17 into a plurality of first sub-grooves 174. The plurality of first sub-grooves 174 are arranged in sequence and spaced apart along the Y direction. The length of each first sub-groove 174 may also be the same or different. In this embodiment, the number of the first partitions 173 is three. The three first partitions 173 are arranged in sequence and spaced apart along the Y direction, and divide the first guide groove 17 into four first sub-grooves 174. In other embodiments, the number of the first partitions 173 may also be two, four or more than five.

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

[0073] The second boss 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 member 10 is also provided with a second guide groove 18. The opening of the second guide groove 18 is located on the second surface 112 and is recessed toward the second boss 16. The second 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 is connected to the second bottom wall 181. It can be understood that the second bottom wall 181 is the bottom wall of the second guide groove 18. Among them, the surface roughness of the second bottom wall 181 is less than the surface roughness 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 recesses and a plurality of protrusions arranged in an alternating manner. Exemplarily, 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 performing rough grinding on the second bottom wall 181. Alternatively, a position corresponding to the second bottom wall 181 on the molding die for forming the insulating member 10 may be roughly polished so that the second bottom wall 181 of the insulating member 10 obtained during the injection molding process has a greater 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 and spaced apart 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 and spaced apart along the Y direction. The length of each second sub-groove 184 may also be the same or different. In this embodiment, the number of the second partitions 183 is three. The three second partitions 183 are arranged in sequence and spaced apart along the Y direction, and divide the second guide groove 18 into four second sub-grooves 184. In other embodiments, the number of the second partitions 183 may also be two, four or more than five.

[0076] The second bottom wall 181 is provided with a second guide hole 185. The second guide hole 185 penetrates the second bottom wall 181 and the second bottom surface 151. That is, the second guide hole 185 connects the second guide groove 18 and the receiving chamber 51 of the shell 50. The electrolyte entering the second guide groove 18 can flow into the receiving chamber 51 through the second guide hole 185. The number of the second guide holes 185 is multiple. The bottom wall of each second sub-groove 184 is provided with at least one second guide hole 185. The electrolyte entering each second sub-groove 184 can flow into the receiving chamber 51 through the corresponding second guide hole 185. In this embodiment, the bottom wall of each second sub-groove 184 is provided with two second guide holes 185. The two second 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 can be understood that in this embodiment, the number of the second 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 melting.

[0078] The first through hole 113 and the first pole through hole 23 are arranged opposite to each other along the Z direction and are connected to each other. 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 to each other along the Z direction and are connected to each other. 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 is arranged opposite to the explosion-proof boss 12 along the Z direction, and the openings of the second groove 13 and the first groove 141 are both facing the explosion-proof valve 80. The groove bottom wall of the second groove 13 and the groove bottom wall of the first groove 141 are both arranged spaced from the explosion-proof valve 80 along the Z direction, and a ventilation space is formed between the insulating member 10 and the explosion-proof valve 80. When the pressure inside the energy storage device 100 is too high, the pressure gas in the receiving chamber 51 enters the second groove 13 through the first vent 131, and enters the first groove 141 through the second through hole 114. That is, the pressure gas in the receiving chamber 51 enters the ventilation space through the first vent 131 and the second through hole 114. Then, the pressure gas entering the ventilation space impacts the explosion-proof valve 80 again, causing the explosion-proof valve 80 to open and release pressure, thereby avoiding the explosion of the energy storage device 100 and improving the safety performance of the energy storage device 100.

[0080] In this embodiment, by providing a plurality of first vent holes 131 and second vent holes 145 in the insulating member 10, the pressurized gas generated in the receiving chamber 51 can smoothly pass through the first vent holes 131 and the second vent holes 145 into between the insulating member 10 and the explosion-proof valve 80 to impact the explosion-proof valve 80, thereby realizing the explosion-proof function of the energy storage device 100. In addition, 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, so that a larger ventilation space is formed between the insulating member 10 and the explosion-proof valve 80, which facilitates the accumulation of pressurized gas at the first inclined surface 142 and the second inclined surface 143, thereby facilitating the explosion-proof valve 80 to open and release pressure, 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 connected to each other. In 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 wet 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, part 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 will shake due to transportation problems, which will 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 of the electrolyte flows toward the first groove 141 .

[0084] Specifically, the electrolyte flowing toward the first guide groove 17 enters the first guide groove 17, and flows into the receiving chamber 51 through the first guide hole 175. In this embodiment, by providing the first guide groove 17 on the insulating member 10 and providing the first guide hole 175 in the first guide groove 17, the electrolyte flowing between the insulating member 10 and the end cover 20 during the injection process can flow into the receiving chamber 51 through the first guide groove 17 and the first guide hole 175, thereby avoiding waste of the electrolyte. Moreover, in the present embodiment, by dividing the first guide groove 17 into a plurality of first sub-grooves 174 arranged along the Y direction, the electrolyte can simultaneously enter the receiving cavity 51 from the plurality of first sub-grooves 174 and the first guide hole 175 provided in each first sub-groove 174, thereby increasing the speed at which the electrolyte flows into the receiving cavity 51, that is, increasing the injection speed, and at the same time making the electrolyte more evenly distributed in the receiving cavity 51, thereby increasing the wetting speed and wetting effect of the electrode assembly 70.

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

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

[0087] Furthermore, in the present embodiment, by setting the surface roughness of the first bevel 142 to be greater than the surface roughness of the first surface 111, that is, setting the first bevel 142 to be a rough surface, the flow velocity of the electrolyte along the first bevel 142 can be reduced, thereby reducing the velocity of the electrolyte flowing back to the accommodating cavity 51, thereby 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 that enters the gap between the insulating member 10 and the end cover 20 simultaneously flows through the first guide groove 17, the second guide groove 18 and the first groove 141 to the receiving chamber 51. Specifically, when the energy storage device 100 shakes, part of the electrolyte that enters the gap between the insulating member 10 and the end cover 20 enters the first guide groove 17 and flows through the first guide hole 175 to the receiving chamber 51; part of the electrolyte enters the second guide groove 18 and flows through the second guide hole 185 to the receiving chamber 51; part of the electrolyte flows along the first inclined surface 142 and the second inclined surface 143 to the first groove 141, and flows through the second vent hole 145 and / or the first vent hole 131 to the receiving chamber 51.

[0089] In this embodiment, by respectively providing the first guide groove 17 and the second guide groove 18 on opposite sides of the length direction of the insulating member 10, the speed at which the electrolyte that enters between the insulating member 10 and the end cover 20 due to the shaking of the energy storage device 100 flows back to the inside of the energy storage device 100 can be increased, thereby further avoiding waste of the electrolyte. In addition, in this embodiment, by simultaneously providing the first inclined surface 142 and the second inclined surface 143 in the first groove 141, the electrolyte that enters 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 groove 141, and flow into the receiving chamber 51 through the first vent hole 131 and the second vent hole 145, thereby further improving the reflux rate of the electrolyte.

[0090] Furthermore, in the present embodiment, by simultaneously setting the surface roughness of the first bevel 142 and the second bevel 143 to be greater than the surface roughness of the first surface 111, that is, setting both the first bevel 142 and the second bevel 143 to be rough surfaces, the flow velocity of the electrolyte along the first bevel 142 and the second bevel 143 can be reduced, that is, the velocity of the electrolyte flowing toward the first groove 141 can be reduced, thereby reducing the velocity of the electrolyte flowing back to the accommodating cavity 51, and further reducing the impact force of the electrolyte on the electrode assembly 70, thereby avoiding damage to the electrode assembly 70.

[0091] In this 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 guide groove 17, the second guide groove 18 and the first groove 141, and flow back to the interior of the energy storage device 100, thereby avoiding part of the electrolyte from remaining on the first surface 111, thereby improving the reflux rate of the electrolyte, and further avoiding waste of the electrolyte.

[0092] Furthermore, in the present embodiment, by setting the surface roughness of the second surface 112 to be greater than the surface roughness of the first surface 111, that is, setting the second surface 112 to be a rough surface, droplets of electrolyte splashed onto the relatively rough second surface 112 can form a suspended hemispherical shape and fall back into the receiving cavity 51 with a slight vibration, thereby preventing the electrolyte from remaining on the insulating member 10 and not participating in the electrochemical reaction of the electrode assembly 70, thereby improving the utilization rate of the electrolyte and increasing 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, fine welding slag, broken pole ears and other metal particles or other impurities may also enter the receiving cavity 51 through the first guide groove 17 and the second guide groove 18, that is, enter the interior of the electrode assembly 70, which may cause a short circuit in the energy storage device 100, thereby affecting the safety performance of the energy storage device 100.

[0094] In this embodiment, by setting the surface roughness of the bottom wall of the first guide groove 17 and the bottom wall of the second guide groove 18 to be greater than the surface roughness of the first surface 111, that is, setting the first bottom wall 171 and the second bottom wall 181 to rough surfaces, metal particles and other impurities falling into the first guide groove 17 can be blocked on the first bottom wall 171, and metal particles and other impurities falling into the second guide groove 18 can be blocked on the second bottom wall 181, thereby reducing the entry of metal particles or other impurities into the interior of the electrode assembly 70, thereby improving the safety performance of the energy storage device 100.

[0095] Specifically, in this embodiment, by setting the first bottom wall 171 as a rough surface, the metal particles with larger sizes among the metal particles falling into the first guide groove 17 are stuck in the rough particle gaps of the first bottom wall 171, 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 first bottom wall 171 as a rough surface, the metal particles with smaller sizes among the metal particles falling into the first guide groove 17 can flow along the rough particle gaps of the first bottom wall 171, 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 first bottom wall 171, thereby increasing the difficulty of the smaller metal particles to flow back to the interior of the electrode assembly 70, that is, making it difficult for the smaller metal particles to flow back to the interior of the electrode assembly 70. Part of the metal particles with smaller sizes flowing along the rough particle gaps of the first bottom wall 171 are stuck in the rough particle gaps of the first bottom wall 171, thereby reducing the metal particles from entering the interior of the electrode assembly 70; some metal particles with smaller sizes flow back to the interior of the electrode assembly 70 through the rough particle gaps of the first bottom wall 171. Since the metal particles flowing back to the interior of the electrode assembly 70 are smaller in size, the possibility of short circuit inside the electrode assembly 70 can be reduced, thereby improving the safety performance of the energy storage device 100. Among them, larger metal particles refer to metal particles whose size is slightly larger than or equal to the size of the rough particle gaps of the first bottom wall 171. Smaller metal particles refer to metal particles whose size is 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 metal particles with larger sizes among the metal particles falling into the second guide groove 18 are stuck in the rough particle gaps of 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 metal particles with smaller sizes among the metal particles falling into the second guide groove 18 can flow along the rough particle gaps of 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. Part of the metal particles with smaller sizes flowing along the rough particle gaps of the second bottom wall 181 are stuck in the rough particle gaps of the second bottom wall 181, thereby reducing the metal particles from entering the interior of the electrode assembly 70; some of the metal particles with smaller sizes flow back to the interior of the electrode assembly 70 through the rough particle gaps of the second bottom wall 181. Since the metal particles flowing back to the interior of the electrode assembly 70 are smaller in size, the possibility of short circuit inside the electrode assembly 70 can be reduced, thereby improving the safety performance of the energy storage device 100. The larger metal particles here refer to metal particles whose size is slightly larger than or equal to the size of the rough particle gaps of the second bottom wall 181, and the smaller metal particles refer to metal particles whose size is smaller than the size of the rough 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, when the insulating member 10 is about to be separated from the movable mold surface of the molding mold, a small gap can be formed between the first bottom wall 171 and the mold, and between the second bottom wall 181 and the molding mold, so that the space can enter the gap, thereby improving the convenience of demolding the molding mold 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, which are only for the convenience of distinction and do 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 ejector pin is used to eject the solidified plastic from the molding mold for demolding. The shape of the pit ejected by the ejector 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. Multiple first push points 102 are arranged at intervals along the Y direction. The bottom wall of each first sub-groove 174 is provided with at least one first push point 102. The number of the first push points 102 provided at least two first sub-grooves 174 is different. Exemplarily, along the width direction of the insulating member 10, the number of first push points 102 provided at the first sub-groove 174 located in the middle position is greater than the number of first push points 102 provided at the first sub-grooves 174 located at the two side positions. In this embodiment, the bottom wall of the first sub-groove 174 located in the middle position is provided with two first push points 102, that is, the bottom walls of the second first sub-groove 1742 and the third first sub-groove 1743 are both provided with two first push points 102. The bottom wall of the first sub-groove 174 located at the two side positions is provided with a first push point 102, that is, the bottom walls of the first first sub-groove 1741 and the fourth first sub-groove 1744 are both provided with a 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 of the groove bottom wall of the first first sub-groove 1741. The two first push points 102 provided in the second first sub-groove 1742 are respectively located on opposite sides of the two first guide holes 175 of the groove 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 of the groove bottom wall of the fourth first sub-groove 1744.

[0104] In this embodiment, a plurality of first push points 102 are asymmetrically arranged about the first center line P1. That is, when the first push point 102 located on one side of the first center line P1 is mirrored to the other side of the first center line P1, it does not overlap with the first push point 102 located on 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 distances from the first center line P1 to the two opposite edges of the insulating member 10 along the Y direction are equal.

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

[0106] Please continue reading Figure 8 , there are multiple second push points 103. Multiple second push points 103 are arranged at intervals along the Y direction. The bottom wall of each second sub-groove 184 is provided with at least one second push point 103. The number of second push points 103 provided in at least two of the second sub-grooves 184 is different. Exemplarily, along the width direction of the insulating member 10, the number of second push points 103 provided in the second sub-groove 184 located in the middle position is greater than the number of second push points 103 provided in the second sub-grooves 184 located at the two side positions. In this embodiment, the bottom walls of the second second sub-groove 1842 and the third second sub-groove 1843 are each provided with two second push points 103, and the bottom walls of the first second sub-groove 1841 and the fourth second sub-groove 1844 are each provided with one second push point 103.

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

[0108] In this embodiment, the second push point 103 and the first push point 102 are symmetrically arranged about the second center line P2. The second center line P2 is the center line of the insulating member 10 in the X direction. The second center line P2 is parallel to the Y direction, and the distances between the two opposite edges of the second insulating member 10 in the Y direction are equal.

[0109] Multiple second push points 103 are asymmetrically arranged about the first center line P1. Along the Y direction and in the direction away from the first center line P1, the second push points 103 arranged in the second second sub-groove 1842 are respectively the first second push point 1031 and the second second push point 1032, and the second push points 103 arranged in the third second sub-groove 1843 are respectively the third second push point 1033 and the fourth second push point 1034. In this embodiment, the first second push point 1031 and the third second push point 1033 are staggered along the Y direction, and the third second push point 1033 is located on the side of the first second push point 1031 close to the explosion-proof boss 12. The second second push point 1032 and the fourth second push 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 member 10 is about to be separated from the movable mold surface of the molding die, the gas first enters the edge position during the demolding process. In this embodiment, by setting push points 101 on both sides of the insulating member 10 in the length direction, that is, setting a first push point 102 in the first guide groove 17 and a second push point 103 in the second guide groove 18, during the demolding process, it is convenient for air to enter between the insulating member 10 and the molding die, thereby facilitating the demolding of the insulating member 10 and simplifying the molding process of the insulating member 10.

[0111] Furthermore, along the width direction of the insulating member 10, the adhesive force between the insulating member 10 located at the center and the molding die is greater, and the degree of adhesion is stronger. In this embodiment, by setting the number of first push points 102 provided in the first sub-grooves 174 located at the middle position to be greater than the number of first push points 102 provided in the first sub-grooves 174 located at the two side positions, and setting the number of second push points 103 provided in the second sub-grooves 184 located at the middle position to be greater than the number of second push points 103 provided in the second sub-grooves 184 located at the two side positions, during the demolding process, the demolding force received by the center position in the width direction of the insulating member 10 is greater, thereby further facilitating the demolding of the insulating member 10 and further simplifying the molding process of the insulating member 10.

[0112] In this embodiment, by arranging the first push point 102 and the second push point 103 symmetrically about the second center line P2, during the demolding process of the insulating part 10, the insulating part 10 is subjected to more uniform force on both sides of its length direction, thereby making it easier to demold the insulating part 10, and can reduce or even avoid deformation and material falling of the insulating part 10.

[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 fool-proof identification effect can be achieved, and visual CCD (Charge Coupled Device) identification and detection of the insulating member 10 is facilitated when the insulating member 10 is assembled, thereby avoiding the phenomenon of position deflection or inversion of the insulating member 10 during the assembly process, thereby simplifying the production process of the energy storage device 100 and improving the production efficiency of the energy storage device 100.

[0114] In one embodiment, a first protrusion (not shown) is provided in the first guide groove 17. The first protrusion is provided on the bottom wall of the first guide groove 17 and is provided around the outer periphery of the first guide hole 175. In this embodiment, there are multiple first protrusions. Multiple first protrusions are provided in a one-to-one correspondence with multiple first guide holes 175, and one first protrusion is provided corresponding to the outer periphery of one 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 of the first bottom wall 171, or the height of the first protrusion may be slightly greater than the height of the rough particles of the first bottom wall 171. Exemplarily, the first protrusion may be formed simultaneously with the rough first bottom wall 171 through grinding or other processes, or the first protrusion may be formed after the rough first bottom wall 171 is formed, or the first protrusion may be formed before the rough first bottom wall 171 is formed.

[0116] In this embodiment, by setting 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 the 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. Multiple second protrusions are arranged in a one-to-one correspondence with multiple second guide holes 185, and one second protrusion is arranged corresponding to the outer periphery of one second guide hole 185. Among them, the height of the second protrusion can be consistent with or substantially the same as the height of the rough particles on the second bottom wall 181, or the height of the second protrusion can also be slightly greater than the height of the rough particles on the second bottom wall 181.

[0118] In this embodiment, by setting a second protrusion around the second guide hole 185 on the bottom wall of the second guide groove 18, it is possible to further block the metal particles that fall into the second guide groove 18, and further prevent the metal particles that fall into the second guide groove 18 from flowing into the interior of the electrode assembly 70 through the second guide hole 185, thereby improving the safety performance of the energy storage device 100.

[0119] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An insulating member for an energy storage device, characterized in that: The insulating member comprises 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.

2. The insulating member according to claim 1, characterized in that There are at least two guide grooves, two of which are respectively a first guide groove and a second guide groove, the first guide groove and the second guide groove are arranged at intervals along the length direction of the insulating member, and are respectively located at two opposite edge areas 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 penetrates 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 penetrates 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.

3. The insulating member according to claim 2, characterized in that: 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 groove bottom wall of the first groove is provided with a first vent hole, and the first vent hole passes through the groove bottom wall of the first groove; The first groove includes a first slope and a second slope, and the first slope and the second slope 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 slope to the second slope, the distance from the first slope 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 slope to the first slope, the distance from the second slope to the first surface along the thickness direction of the insulating member gradually increases.

4. The insulating member according to claim 3, characterized in that: 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.

5. The insulating member according to claim 1, characterized in that: 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.

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

7. The insulating member according to any one of claims 2 to 5, characterized in that: A plurality of first push points are provided on the bottom wall of the first guide groove, and the plurality of first push points are arranged at intervals along the width direction of the insulating member.

8. The insulating member according to claim 7, characterized in that 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 two opposite edges of the insulating member in the width direction are equal; and the plurality of first push points are asymmetrically arranged about the first center line.

9. The insulating member according to claim 7, characterized in that: The first guide groove comprises a plurality of first sub-grooves, the plurality of first sub-grooves are arranged at intervals along the width direction of the insulating member, 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 of the first sub-grooves is provided with at least one first pushing point, and the number of the first pushing points provided in at least two of the first sub-grooves is different.

10. The insulating member according to claim 8, characterized in that 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 two opposite edges of the insulating member in the length direction are equal; the second push point and the first push point are symmetrically arranged about the second center line.

11. The insulating member according to claim 3, characterized in that: 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 arranged at intervals along the length direction of the insulating member and penetrate 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 pole of the energy storage device to pass through, and the second through hole is used for the negative pole of the energy storage device to pass through; or, the first through hole is used for the negative pole of the energy storage device to pass through, and the second through hole is used for the positive pole of the energy storage device to pass through.

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

13. The end cap assembly according to claim 12, characterized in that: The end cover is also provided with a liquid injection through hole and an explosion-proof hole, wherein the explosion-proof hole and the liquid injection hole are arranged at intervals along the length direction of the insulating member; the liquid injection through hole is arranged opposite to and communicated 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; along the thickness direction of the end cover assembly, the explosion-proof valve is arranged opposite to the groove of the insulating member and is spaced apart from the bottom wall of the first groove.

14. An energy storage device, characterized in that: It comprises a shell, an electrode assembly and an end cap assembly as described in claim 12 or 13, wherein the shell has an opening, the shell is provided with a receiving cavity, and the receiving cavity is communicated with the opening; the electrode assembly is arranged in 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 shell.

15. An electrical equipment, characterized in that: It includes the energy storage device as described in claim 14, and the energy storage device is used to supply power to the electrical equipment.

Images