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 which are oppositely arranged along the thickness direction. The insulating part is sequentially provided with a first diversion trench, a liquid injection hole and a second diversion trench at intervals in the first direction. The first flow guide groove comprises a plurality of first sub-grooves arranged at intervals in the second direction. The first sub-grooves are the same in size in the second direction. The groove bottom wall of each first sub-groove is provided with at least one first flow guide hole. The second flow guide groove comprises a plurality of second sub-grooves arranged at intervals in the second direction. In the second direction, the size of the second sub-groove close to the middle position in the second direction is different from the size of the second sub-grooves close to the two side positions in the second direction. And the groove bottom wall of each second sub-groove is provided with at least one second flow guide hole. According to the insulating part provided by the invention, the electrolyte positioned between the insulating part and the end cover can quickly flow back into the battery cell, so that the waste of the electrolyte is avoided.

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, are batteries that can be recharged to activate the active materials after discharge and continue to be used. Secondary batteries include insulating parts for insulating the end caps and the poles. There is usually a certain gap between the end caps and the insulating parts. When the electrolyte is injected into the battery, the electrolyte will flow into the gap, resulting in a slower injection speed. 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 enable the electrolyte between the insulating member and the end cover to flow quickly into the battery cell, thereby increasing the injection speed.

[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 first guide groove, an injection hole, and a second guide groove. The first guide groove, the injection hole, and the second guide groove are arranged in sequence along the first direction; the openings of the first guide groove and the second guide groove are both located on the first surface, and the injection hole passes through the first surface and the second surface along the thickness direction of the insulating member.

[0005] The first guide groove includes a plurality of first sub-grooves spaced apart along the second direction, and each of the first sub-grooves has the same size along the second direction. 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 second guide groove includes a plurality of second sub-grooves spaced apart along the second direction. Along the second direction, the size of the second sub-groove near the middle position along the second direction is different from the size of the second sub-groove near the two side positions along the second direction. The bottom wall of each second sub-groove is provided with at least one second guide hole, and the second guide hole penetrates the bottom wall of the second sub-groove. Wherein, the first direction is perpendicular to the second direction.

[0006] In a possible implementation, the insulating member has a first center line, the first center line is parallel to the second direction, and the distances from the second center line to two opposite edges of the insulating member along the first direction are equal. The first guide groove and the second guide groove are asymmetrically arranged about the first center line.

[0007] In a possible implementation, the dimensions of the plurality of first sub-grooves along the second direction are the same; along the second direction, the dimensions of the second sub-grooves near the middle position along the second direction are different from the dimensions of the second sub-grooves near the two side positions along the second direction.

[0008] In a possible implementation manner, along the second direction, a size of the second sub-groove near the middle position along the second direction is greater than a size of the second sub-groove near the two side positions along the second direction.

[0009] In a possible implementation manner, the sizes of the plurality of first sub-grooves along the second direction are the same; the sizes of the plurality of second sub-grooves along the second direction are the same.

[0010] In a possible implementation, the insulating member includes an explosion-proof portion. The explosion-proof portion is provided with a groove, the opening of the groove is located on the first surface, and the groove is located between the injection hole and the second guide groove. A through hole is provided on the bottom wall of the groove, and the through hole passes through the second surface. The explosion-proof portion is used to be arranged opposite to the explosion-proof valve of the energy storage device.

[0011] In a possible implementation manner, the insulating member includes a first partition plate, which is disposed in the first guide groove along a width direction of the insulating member and is spaced apart from two opposite side walls of the first guide groove along a length direction of the insulating member.

[0012] In a possible implementation, the insulating member has a second center line, the second center line is parallel to the length direction of the insulating member, and the distances from the second center line to two opposite edges in the width direction of the insulating member are equal; and a plurality of second sub-grooves are symmetrically arranged about the second center line.

[0013] In a possible implementation, the insulating member includes a first connecting portion and a first guide portion, and the first guide portion, the first connecting portion and the explosion-proof portion are sequentially connected along the first direction. The first guide groove is provided in the first guide portion, and the injection hole is provided in the first connecting portion; the first surface is a plane, and the thickness of the first guide portion is greater than or equal to the thickness of the first connecting portion.

[0014] In a possible implementation manner, the insulating member further includes a second connecting portion and a second guide portion. The second connecting portion is connected to a side of the explosion-proof portion facing away from the first connecting portion, and the second guide portion is connected to a side of the second connecting portion facing away from the explosion-proof portion. The second guide groove is provided in the second guide portion. The thickness of the second guide portion is greater than or equal to the thickness of the second connecting portion and the thickness of the first connecting portion.

[0015] In a possible implementation, the insulating member is provided with a first through hole and a second through hole, and the first through hole and the second through hole both penetrate the first surface and the second surface along the thickness direction of the insulating member. The first through hole is provided between the injection hole and the first guide groove, and is spaced apart from the injection hole and the first guide groove; the second through hole is provided between the groove and the second guide groove, and is spaced apart from the 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. Alternatively, 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. The end cap assembly comprises an end cap and the above-mentioned insulating member. The end cap is provided with a liquid injection through hole, the liquid injection through hole penetrates the end cap along the thickness direction of the end cap, the insulating member and the end cap are stacked and fixedly connected along the thickness direction of the end cap assembly, the first surface faces the end cap, and the liquid injection hole and the liquid injection through hole are arranged opposite to each other and are connected to each other.

[0017] In a possible implementation, the end cover is further provided with an explosion-proof hole, and the explosion-proof hole is spaced apart from the injection hole along the first direction. The end cover assembly further includes an explosion-proof valve, which is disposed 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 disposed opposite to the groove and spaced apart from the bottom wall of the groove.

[0018] In a possible implementation, the end cover is further provided with a first pole through hole and a second pole through hole, the first pole through hole and the second pole through hole are arranged at intervals along the first direction, and along the thickness direction of the end cover assembly, the first pole through hole is arranged opposite to the first through hole of the insulating member and is interconnected, and the second pole through hole is arranged opposite to the second through hole of the insulating member and is interconnected. The end cover assembly also includes a first pole and a second pole, the first pole is passed through the first pole through hole and the first through hole, and the second pole is passed through the second pole through hole and the second through hole.

[0019] 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, and the end cap assembly covers the opening and is fixedly connected to the shell.

[0020] In a fourth aspect, the present application provides an electric device. The electric device includes the above energy storage device. The energy storage device is used to supply power to the electric device.

[0021] In summary, the energy storage device provided by the present application is provided with a first guide groove on the insulating member, and a first guide hole in the first guide groove, so that the electrolyte flowing between the insulating member and the end cover during the injection process can flow into the receiving cavity through the first guide groove and the first guide hole, thereby improving the injection speed, and avoiding part of the electrolyte from staying on the first surface, thereby avoiding waste of the electrolyte. At the same time, by dividing the first guide groove into a plurality of first sub-grooves, the electrolyte can flow from a plurality of first sub-grooves to the interior of the energy storage device at the same time, thereby further improving the injection speed, and making the electrolyte more evenly distributed inside the energy storage device, thereby improving the infiltration speed and infiltration effect of the electrode assembly. In addition, in the present application, by further providing a second guide groove on the insulating member, when the electrolyte inside the energy storage device is shaken due to transportation problems and enters the gap between the insulating member and the end cover, the electrolyte can flow back to the interior of the energy storage device from the first guide groove and the second guide groove at the same time, thereby improving the reflux speed of the electrolyte. 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 is a schematic structural diagram of an energy storage device provided in the first embodiment of 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 part of the structure of the insulating member shown;

[0030] Figure 8 yes Figure 5 A schematic diagram of another part of the structure of the insulating member shown;

[0031] Fig. 9 yes Figure 6 A schematic diagram of the cross-sectional structure of the insulating member shown along the AA direction;

[0032] Fig.10 is a partial structural schematic diagram of an insulating member provided in another embodiment of the present application;

[0033] Fig.11 is a partial structural schematic diagram of an insulating member provided in another embodiment of the present application;

[0034] Fig.12 is a schematic structural diagram of an insulating member in an energy storage device provided in a second embodiment of the present application;

[0035] Fig.13 It is a schematic diagram of the structure of the insulating component in the energy storage device provided in the third embodiment of the present application.

[0036] 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 Column through hole 23; second pole through hole 24; explosion-proof hole 25; injection through hole 26; first surface 101; second surface 102; first guide portion 11; seventh surface 111; eighth surface 112; first guide groove 113; first side surface 1131; second side surface 1132; third side surface 1133; fourth side surface 1134; first bottom surface 1135; first sub-groove 1136; first sub-groove 1137; second partition 114; first partition 115; first guide hole 116; second guide portion 12; ninth surface 121; tenth side 122; second guide groove 123; fifth side 1231; sixth side 1232; seventh side 1233; eighth side 1234; second bottom 1235; third partition 124; first third partition 1241; second third partition 1242; third third partition 1243; fourth third partition 1244; fourth partition 125; second sub-groove 126; first second sub-groove 1261; second second sub-groove 1262; third second sub-groove 1263; fourth second sub-groove 126 64; fifth second sub-groove 1265; second sub-groove 127; second guide hole 128; explosion-proof part 13; fifth surface 131; sixth surface 132; groove 133; first side wall 1331; second side wall 1332; groove bottom wall 1333; through hole 134; first connecting part 14; first surface 141; second surface 142; first through hole 143; injection hole 144; second connecting part 15; third surface 151; fourth surface 152; second through hole 153; hot melt column 16; second center line P1; first center line P2. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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:

[0041] (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;

[0042] (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.

[0043] 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.

[0044] 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. 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 / power outage. 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 / power outage. Among them, the transmission of electric energy can be transmitted using high-voltage cables.

[0045] 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.

[0046] 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.

[0047] See also Figure 2 and Figure 3 , Figure 2 is a schematic structural diagram of an energy storage device 100 provided in the first embodiment of the present application, Figure 3 yes Figure 2 A schematic diagram of the exploded structure of the energy storage device 100 is shown.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The insulating member 10 is the lower plastic of the energy storage device 100. 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.

[0058] The insulating member 10 includes a first flow guide portion 11, a second flow guide portion 12, an explosion-proof portion 13, a first connecting portion 14, and a second connecting portion 15. Along the length direction of the insulating member 10, the first flow guide portion 11, the first connecting portion 14, the explosion-proof portion 13, the second connecting portion 15, and the second flow guide portion 12 are connected in sequence. The first connecting portion 14 includes a first surface 141 and a second surface 142. The first surface 141 and the second surface 142 are arranged opposite to each other along the thickness direction of the insulating member 10. The first connecting portion 14 is provided with a first through hole 143 and a liquid injection hole 144. The first through hole 143 and the liquid injection hole 144 are arranged at intervals along the X direction and penetrate the first surface 141 and the second surface 142. Among them, the liquid injection hole 144 is located on the side of the first through hole 143 close to the explosion-proof portion 13, that is, the liquid injection hole 144 is located between the first through hole 143 and the explosion-proof portion 13. The liquid injection hole 144 is arranged corresponding to the liquid injection through hole 26. 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 26 and the injection hole 144 to infiltrate the electrode assembly 70. The first through hole 143 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 143, and is connected to the first connector 61.

[0059] The second connection portion 15 includes a third surface 151 and a fourth surface 152. The third surface 151 and the fourth surface 152 are arranged opposite to each other along the thickness direction of the insulating member 10. The second connection portion 15 is connected to the side of the first connection portion 14 that is opposite to the explosion-proof portion 13, and the third surface 151 is flush with the first surface 141, and the fourth surface 152 is flush with the second surface 142. In this embodiment, the thickness of the first connection portion 14 and the second connection portion 15 are consistent or substantially the same. The second connection portion 15 is provided with a second through hole 153. The second through hole 153 penetrates the third surface 151 and the fourth surface 152 along the Z direction. The second through hole 153 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 153, and is connected to the second connection member 62.

[0060] The explosion-proof part 13 includes a fifth surface 131 and a sixth surface 132. The fifth surface 131 and the sixth surface 132 are arranged opposite to each other along the thickness direction of the insulating member 10. The explosion-proof part 13 is connected between the first connecting part 14 and the second connecting part 15, and is arranged opposite to the explosion-proof valve 80 along the Z direction. Among them, the fifth surface 131 is flush with the first surface 141 and the third surface 151, and the sixth surface 132 protrudes from the second surface 142 and the fourth surface 152. It can be understood that the thickness of the explosion-proof part 13 is greater than the thickness of the first connecting part 14 and the thickness of the second connecting part 15. That is, the size of the explosion-proof part 13 along the Z direction is greater than the size of the first connecting part 14 along the Z direction and the size of the second connecting part 15 along the Z direction, so as to improve the strength of the insulating member 10. Alternatively, the sixth surface 132 can also be flush with the second surface 142 and the fourth surface 152, and the thickness of the explosion-proof part 13 is consistent with the thickness of the first connecting part 14 and the second connecting part 15.

[0061] The explosion-proof part 13 is provided with a groove 133. The opening of the groove 133 is located at the fifth surface 131 and is recessed toward the sixth surface 132. The groove 133 includes a first side wall 1331, a second side wall 1332 and a groove bottom wall 1333. The first side wall 1331 and the second side wall 1332 are arranged opposite to each other along the X direction. In this embodiment, the first side wall 1331 and the second side wall 1332 are both inclined surfaces. Along the direction from the sixth surface 132 to the fifth surface 131, the distance between the first side wall 1331 and the second side wall 1332 gradually increases. That is, along the direction from the sixth surface 132 to the fifth surface 131, the size of the groove 133 along the X direction gradually increases.

[0062] The bottom wall 1333 of the groove is provided with a through hole 134. The through hole 134 runs through the bottom wall 1333 of the groove and the sixth surface. Among them, the number of through holes 134 is multiple. Multiple through holes 134 are arranged in an array along the X direction and the Y direction. In this embodiment, the bottom wall 1333 of the groove is provided with two rows of through holes 134, and the two rows of through holes 134 are arranged at intervals along the X direction, and each row includes eight through holes 134 arranged at intervals along the X direction. In other embodiments, the through holes 134 can also be one row, three rows or more, and the number of through holes 134 in each row can be greater than eight or less than eight, and the number of through holes 134 in each row can be the same or different. Alternatively, multiple through holes 134 can also be randomly arranged on the bottom wall 1333 of the groove, and no specific restrictions are made on the arrangement of the through holes 134 here.

[0063] Please combine Figure 7 , Figure 7 yes Figure 5 A partial structural schematic diagram of the insulating member 10 is shown.

[0064] The first guide portion 11 includes a seventh surface 111 and an eighth surface 112. The seventh surface 111 and the eighth surface 112 are arranged opposite to each other along the thickness direction of the insulating member 10. The first guide portion 11 is connected to the side of the first connecting portion 14 facing away from the explosion-proof portion 13. Among them, the seventh surface 111 is flush with the fifth surface 131, the first surface 141 and the third surface 151, and the eighth surface 112 protrudes from the second surface 142. It can be understood that the thickness of the first guide portion 11 is greater than the thickness of the first connecting portion 14. That is, the size of the first guide portion 11 along the Z direction is greater than the size of the first connecting portion 14 along the Z direction, so as to further improve the strength of the insulating member 10. Alternatively, the eighth surface 112 can also be flush with the second surface 142 and the fourth surface 152, and the thickness of the first guide portion 11 is consistent with the thickness of the first connecting portion 14 and the second connecting portion 15.

[0065] The first guide portion 11 is provided with a first guide groove 113. The opening of the first guide groove 113 is located at the seventh surface 111 and is recessed toward the eighth surface 112. The first guide groove 113 includes a first side surface 1131, a second side surface 1132, a third side surface 1133, a fourth side surface 1134 and a first bottom surface 1135. The first side surface 1131, the second side surface 1132, the third side surface 1133 and the fourth side surface 1134 are connected end to end and are arranged around the first bottom surface 1135. The first side surface 1131 and the third side surface 1133 are arranged opposite to each other along the X direction. The second side surface 1132 and the fourth side surface 1134 are arranged opposite to each other along the Y direction and are connected between the first side surface 1131 and the third side surface 1133.

[0066] The first guide portion 11 further includes a second partition 114 and a first partition 115. The second partition 114 and the first partition 115 are both disposed in the first guide groove 113 and connected to the inner wall surface of the first guide groove 113. The second partition 114 and the first partition 115 play a reinforcing role, which can improve the strength of the first guide portion 11, thereby improving the structural strength of the insulating member 10.

[0067] Among them, the extension direction of the second partition 114 is parallel to the X direction. The second partition 114 is vertically connected to the first bottom surface 1135, and is spaced apart from the second side surface 1132 and the fourth side surface 1134, and the opposite ends of the length direction of the second partition 114 are respectively connected to the first side surface 1131 and the third side surface 1133. There are multiple second partitions 114. Multiple second partitions 114 are sequentially spaced along the Y direction, and the distance between each adjacent two partitions is equal. It can be understood that the multiple second partitions 114 divide the first guide groove 113 into multiple first sub-grooves 1136 sequentially spaced along the Y direction. The sizes of the multiple first sub-grooves 1136 are the same or approximately the same. That is, the lengths of the multiple first sub-grooves 1136 are the same and the widths are the same. In this embodiment, the first guide portion 11 includes three second partitions 114. The three second partitions 114 are sequentially spaced along the Y direction, and divide the first guide groove 113 into four first sub-grooves 1136 of the same size. In other embodiments, the number of the second partitions 114 may be two, four, or more than five.

[0068] The extension direction of the first partition 115 is parallel to the Y direction. The first partition 115 is vertically connected to the first bottom surface 1135, and is spaced apart from the first side surface 1131 and the third side surface 1133, and the opposite ends of the length direction of the first partition 115 are respectively connected to the second side surface 1132 and the fourth side surface 1134. In this embodiment, the number of the first partition 115 is one. The first partition 115 divides each first sub-groove 1136 into two first sub-grooves 1137. In other embodiments, the number of the first partitions 115 can also be multiple. When the number of the first partitions 115 is multiple, the multiple first partitions 115 are spaced apart along the X direction. In this embodiment, the distance from the first partition 115 to the first side surface 1131 is equal to the distance from the first partition 115 to the second side surface 1132. The sizes of the two first sub-grooves 1137 in each first sub-groove 1136 are equal.

[0069] It can be understood that the second partition 114 and the first partition 115 divide the first guide groove 113 into a plurality of first sub-grooves 1137. The size of each first sub-groove 1137 is the same or substantially the same. The plurality of first sub-grooves 1137 are arranged in an array along the X direction and the Y direction. Specifically, the plurality of first sub-grooves 1137 are arranged in two rows along the X direction, and each row includes four first sub-grooves 1137. Exemplarily, the width of each first sub-groove 1137 is 4.5 mm, that is, the size along the X direction is 4.5 mm; the length of each first sub-groove 1137 is 14.0 mm, that is, the size along the Y direction is 14.0 mm.

[0070] like Figure 7As shown, the first guide portion 11 is further provided with a first guide hole 116. There are a plurality of first guide holes 116. A first guide hole 116 is provided on the bottom wall of each first sub-slot 1137. The first guide hole 116 penetrates the bottom wall of the first sub-slot 1137 and the eighth surface 112. That is, the first guide hole 116 connects the first guide slot 113 and the receiving chamber 51 of the housing 50. The electrolyte entering the first guide slot 113 can flow into the receiving chamber 51 through the first guide hole 116.

[0071] See also Figure 8 and Fig. 9 , Figure 8 yes Figure 5 Another partial structural schematic diagram of the insulating member 10 is shown, Fig. 9 yes Figure 6 The cross-sectional structure diagram of the insulating member 10 along the AA direction is shown.

[0072] The second guide portion 12 includes a ninth surface 121 and a tenth surface 122. The ninth surface 121 and the tenth surface 122 are arranged opposite to each other along the thickness direction of the insulating member 10. The second guide portion 12 is connected to the side of the second connecting portion 15 facing away from the explosion-proof portion 13. Among them, the ninth surface 121 is flush with the fifth surface 131, the first surface 141, the third surface 151 and the eighth surface 112, and together constitute the first surface 101 of the insulating member 10. The tenth surface 122, the sixth surface 132, the second surface 142, the fourth surface 152 and the eighth surface 112 together constitute the second surface 102 of the insulating member 10. In this embodiment, the tenth surface 122 protrudes from the fourth surface 152. It can be understood that the thickness of the second guide portion 12 is greater than the thickness of the second connecting portion 15. That is, the size of the second guide portion 12 along the Z direction is greater than the size of the second connecting portion 15 along the Z direction. Alternatively, the tenth surface 122 may also be flush with the fourth surface 152 , and the thickness of the second air guide portion 12 is consistent with the thickness of the second connecting portion 15 and the first connecting portion 14 .

[0073] In this embodiment, the first surface 101 and the second surface 102 are arranged opposite to each other along the thickness direction of the insulating member 10, the first surface 101 is a plane, and the second surface 102 includes a fourth surface 152 and a sixth surface 132 arranged flush with each other, and a second surface 142, an eighth surface 112 and a tenth surface 122 protruding from the fourth surface 152.

[0074] The second guide portion 12 is provided with a second guide groove 123. The opening of the second guide groove 123 is located at the ninth surface 121 and is recessed toward the tenth surface 122. The second guide groove 123 includes a fifth side surface 1231, a sixth side surface 1232, a seventh side surface 1233, an eighth side surface 1234 and a second bottom surface 1235. The fifth side surface 1231, the sixth side surface 1232, the seventh side surface 1233 and the eighth side surface 1234 are connected end to end and are arranged around the second bottom surface 1235. The fifth side surface 1231 and the seventh side surface 1233 are arranged opposite to each other along the X direction. The sixth side surface 1232 and the eighth side surface 1234 are arranged opposite to each other along the Y direction and are connected between the fifth side surface 1231 and the seventh side surface 1233.

[0075] The second guide portion 12 further includes a third partition plate 124 and a fourth partition plate 125. The third partition plate 124 and the fourth partition plate 125 are both disposed in the second guide groove 123 and connected to the inner wall surface of the second guide groove 123. The third partition plate 124 and the fourth partition plate 125 play a reinforcing role, which can improve the strength of the second guide portion 12, thereby improving the structural strength of the insulating member 10.

[0076] The extension direction of the third partition 124 is parallel to the X direction. The third partition 124 is vertically connected to the second bottom surface 1235, and is spaced apart from the sixth side surface 1232 and the eighth side surface 1234, and the opposite ends of the third partition 124 in the length direction are respectively connected to the fifth side surface 1231 and the seventh side surface 1233. There are multiple third partitions 124. The multiple third partitions 124 are sequentially spaced apart along the Y direction, and divide the second guide groove 123 into multiple second sub-grooves 126 sequentially spaced apart along the Y direction.

[0077] Combination Figure 6 The insulating member 10 has a first center line P2 and a second center line P1. The first center line P2 is parallel to the width direction of the insulating member 10, that is, parallel to the Y direction. Moreover, the distances from the first center line P2 to the two opposite edges of the insulating member 10 in the length direction are equal.

[0078] In this embodiment, the first guide groove 113 and the second guide groove 123 are asymmetrically arranged about the first center line P2. The dimensions of the plurality of first sub-grooves 1136 along the Y direction are the same. Along the width direction of the insulating member 10, that is, along the Y direction, the length of the second sub-groove 126 located in the middle position is different from the length of the second sub-groove 126 located at the two side positions. Among them, the length of the second sub-groove 126 refers to the dimension of the second sub-groove 126 along the Y direction. Specifically, along the width direction of the insulating member 10, the length of the second sub-groove 126 located in the middle position is greater than the length of the second sub-groove 126 located at the two side positions.

[0079] like Figure 6 and Figure 8As shown, in this embodiment, a plurality of second sub-grooves 126 are symmetrically arranged about the second center line P1. Exemplarily, the number of the third partitions 124 is three. The first third partition 1241, the second third partition 1242 and the third third partition 1243 are sequentially arranged along the sixth side 1232 to the eighth side 1234, and the first guide groove 113 is divided into the first second sub-groove 1261, the second second sub-groove 1262, the third second sub-groove 1263 and the fourth second sub-groove 1264 which are sequentially arranged along the sixth side 1232 to the eighth side 1234.

[0080] Among them, the distance between the second third partition 1242 and the first third partition 1241 is greater than the distance between the first third partition 1241 and the sixth side 1232, and the distance between the second third partition 1242 and the third third partition 1243 is greater than the distance between the third third partition 1243 and the eighth side 1234. The length of the second second sub-groove 1262 is greater than the length of the first second sub-groove 1261 and the length of the fourth second sub-groove 1264, and the length of the third second sub-groove 1263 is greater than the length of the fourth second sub-groove 1264 and the length of the first second sub-groove 1261. In this embodiment, the second second sub-groove 1262 and the third second sub-groove 1263 are symmetrically arranged about the second center line P1, and the first second sub-groove 1261 and the fourth second sub-groove 1264 are symmetrically arranged about the second center line P1. The length of the second second sub-groove 1262 is the same as the length of the third second sub-groove 1263, and the length of the first second sub-groove 1261 is the same as the length of the fourth second sub-groove 1264.

[0081] Exemplarily, the length of the second second sub-groove 1262 and the length of the third second sub-groove 1263 are 18.0 mm, and the length of the first second sub-groove 1261 and the length of the fourth second sub-groove 1264 are 5.0 mm. In other embodiments, the length of the second second sub-groove 1262 and the length of the third second sub-groove 1263 may also be different.

[0082] In one embodiment, Fig.10 As shown, when the number of the third partitions 124 is two, the number of the second sub-grooves 126 is three. The distance between the first third partition 1241 and the second third partition 1242 is greater than the distance between the first third partition 1241 and the sixth side 1232, and greater than the distance between the second third partition 1242 and the eighth side 1234. The length of the second second sub-groove 1262 is greater than the length of the first second sub-groove 1261 and the length of the second second sub-groove 1262. That is, along the width direction of the insulating member 10, the length of the second sub-groove 126 located in the middle position is greater than the length of the second sub-groove 126 located at both sides.

[0083] In one embodiment, Fig.11 As shown, when the number of the third partitions 124 is four, the number of the second sub-grooves 126 is five. The distance between the second third partition 1242 and the third third partition 1243 is greater than the distance between the second third partition 1242 and the first third partition 1241, and greater than the distance between the third third partition 1243 and the fourth third partition 1244. At the same time, the distance between the second third partition 1242 and the first third partition 1241 is greater than the distance between the first third partition 1241 and the sixth side 1232, and the distance between the third third partition 1243 and the fourth third partition 1244 is greater than the distance between the fourth third partition 1244 and the eighth side 1234. The length of the third second sub-groove 1263 is greater than the length of the second second sub-groove 1262 and the length of the fourth second sub-groove 1264, the length of the second second sub-groove 1262 is greater than the length of the first second sub-groove 1261, and the length of the fourth second sub-groove 1264 is greater than the length of the fifth second sub-groove 1265. That is, along the width direction of the insulating member 10, the length of the second sub-grooves 126 located in the middle is greater than the length of the second sub-grooves 126 located at both sides. In other embodiments, the number of the third partitions 124 may be five or more than six.

[0084] Please continue reading Figure 8 and Fig. 9 , the extension direction of the fourth partition 125 is parallel to the Y direction. The fourth partition 125 is vertically connected to the second bottom surface 1235, and is spaced apart from the fifth side surface 1231 and the seventh side surface 1233, and the opposite ends of the length direction of the fourth partition 125 are respectively connected to the sixth side surface 1232 and the eighth side surface 1234. In this embodiment, the number of the fourth partition 125 is one. The fourth partition 125 divides each second sub-groove 126 into two second sub-grooves 127. In other embodiments, the number of the fourth partitions 125 can also be multiple. When the number of the fourth partitions 125 is multiple, the multiple fourth partitions 125 are spaced apart along the X direction. In this embodiment, the distance from the fourth partition 125 to the fifth side surface 1231 is equal to the distance from the fourth partition 125 to the sixth side surface 1232. The sizes of the two second sub-grooves 127 in each second sub-groove 126 are equal.

[0085] It can be understood that the third partition plate 124 and the fourth partition plate 125 divide the second guide groove 123 into a plurality of second sub-grooves 127. The size of each second sub-groove 127 is the same or approximately the same. The plurality of second sub-grooves 127 are arranged in an array along the X direction and the Y direction. Specifically, the plurality of second sub-grooves 127 are arranged in two rows along the X direction, and each row includes four second sub-grooves 127. In this embodiment, the width of each second sub-groove 127 is the same, and along the width direction of the insulating member 10, the length of the second sub-groove 127 located in the middle position is greater than the length of the second sub-grooves 127 located on both sides. Exemplarily, the width of each second sub-groove 127 is 4.5 mm, that is, the size along the X direction is 4.5 mm. The length of the first sub-groove 1137 located in the middle position in the width direction of the insulating member 10 is 18.0 mm, and the length of the second sub-grooves 127 located on both sides in the width direction of the insulating member 10 is 5.0 mm. That is, Figure 5 In the embodiment, the length of the second sub-groove 127 in the second second sub-groove 1262 and the length of the second sub-groove 127 in the third second sub-groove 1263 are 18.0 mm, and the length of the second sub-groove 127 in the first second sub-groove 1261 and the length of the second sub-groove 127 in the fourth second sub-groove 1264 are 5.0 mm.

[0086] like Figure 8 and Fig. 9 As shown, the second guide portion 12 is further provided with a second guide hole 128. There are a plurality of second guide holes 128. A second guide hole 128 is provided on the bottom wall of each second sub-slot 127. The second guide hole 128 penetrates the bottom wall of the second sub-slot 127 and the tenth surface 122. That is, the second guide hole 128 connects the second guide slot 123 and the receiving chamber 51 of the housing 50. The electrolyte entering the second guide slot 123 can flow into the receiving chamber 51 through the second guide hole 128.

[0087] 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 101 faces the back surface 22 of the end cap 20, and the first surface 101 is fixedly connected to the back surface 22. In this embodiment, the insulating member 10 and the end cap 20 are fixedly connected by hot melting.

[0088] Combination Figure 5, a hot melt column 16 is provided on the first surface 101, and a hot melt site corresponding to the hot melt column 16 is provided on the back side 22. The hot melt column 16 is connected to the top cover by hot melt at the hot melt site. There are multiple hot melt columns 16. Multiple hot melt columns 16 are arranged at intervals on the first surface 101. In this embodiment, there are eight hot melt columns 16. Four hot melt columns 16 are respectively provided on the first connecting portion 14 and the second connecting portion 15. The four hot melt columns 16 located in the first connecting portion 14 are arranged in a square or rectangular shape, wherein two hot melt columns 16 are located between the first through hole 143 and the explosion-proof portion 13, and the other two hot melt columns 16 are located between the first through hole 143 and the first guide portion 11. The four hot melt columns 16 located in the second connecting portion 15 are arranged in a square or rectangular shape, wherein two hot melt columns 16 are located between the second through hole 153 and the explosion-proof portion 13, and the other two hot melt columns 16 are located between the second through hole 153 and the first guide portion 11. In other embodiments, the number of the hot melt columns 16 may be two, three, four, six, nine or more.

[0089] In this embodiment, by providing a hot melt column 16 on the insulating member 10 and realizing a hot melt connection between the insulating member 10 and the end cap 20 through the hot melt column 16, the connection method between the insulating member 10 and the end cap 20 can be simplified, and the structure of the energy storage device 100 can be simplified. In addition, in this embodiment, by providing a plurality of hot melt columns 16 on the insulating member 10 and arranging the plurality of hot melt columns 16 at intervals, the insulating member 10 and the end cap 20 are fixedly connected at a plurality of locations, thereby improving the connection stability between the insulating member 10 and the end cap 20.

[0090] The first through hole 143 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 143, and is connected to the first connector 61. The second through hole 153 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 153, and is connected to the second connector 62.

[0091] The explosion-proof valve 80 and the explosion-proof part 13 are arranged opposite to each other along the Z direction, the opening of the groove 133 faces the explosion-proof valve 80, and the groove bottom wall 1333 of the groove 133 is arranged at a distance from the explosion-proof valve 80. When the pressure inside the energy storage device 100 is too high, the pressurized gas in the receiving chamber 51 will enter the groove 133 through the through hole 134 provided on the groove bottom wall 1333 of the groove 133, and then impact the explosion-proof valve 80, so that the explosion-proof valve 80 opens to release pressure, thereby avoiding the explosion of the energy storage device 100 and improving the safety performance of the energy storage device 100. In this embodiment, by providing a plurality of through holes 134 on the groove bottom wall 1333 of the groove 133, the pressurized gas generated in the receiving chamber 51 can smoothly enter the groove 133 through the through hole 134 and impact the explosion-proof valve 80. Furthermore, in the present embodiment, by providing the groove 133 in the insulating member 10 and spacing the explosion-proof valve 80 from the groove bottom wall 1333 of the groove 133, a larger ventilation space can be formed between the insulating member 10 and the explosion-proof valve 80, and the contact area between the pressurized gas and the explosion-proof valve 80 can be increased, thereby increasing the pressure on the explosion-proof valve 80, allowing the explosion-proof valve 80 to open normally to release pressure, thereby further improving the safety performance of the energy storage device 100.

[0092] like Figure 4 As shown, the injection hole 144 and the injection through hole 26 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 26 and the injection hole 144 to wet the electrode assembly 70. It should be noted that since the flow rate of the electrolyte is relatively large during the injection process of the energy storage device 100, part of the electrolyte will splash onto the surface of the insulating member 10 facing the end cover 20, that is, splash onto the first surface 101, thereby generating liquid accumulation on the surface of the insulating member 10 or in the guide groove or groove provided on the first surface 101, causing the electrolyte to fail to fully react with the active material inside the electrode assembly, resulting in a waste of electrolyte.

[0093] In this embodiment, by providing the first guide groove 113 on the insulating member 10 and providing the first guide hole 116 in the first guide groove 113, 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 113 and the first guide hole 116, thereby improving the injection speed, and preventing part of the electrolyte from staying on the first surface 101, thereby avoiding wasting the electrolyte. In addition, in this embodiment, by providing the injection hole 144 between the first guide groove 113 and the groove 133, the electrolyte flowing between the insulating member 10 and the end cover 20 during the injection process can simultaneously flow into the receiving chamber 51 through the groove 133 and the through hole 134, thereby improving the speed at which the electrolyte flows into the interior of the energy storage device 100, thereby improving the injection speed.

[0094] In this embodiment, by dividing the first flow guide groove 113 into a plurality of first sub-grooves 1136 arranged along the Y direction, and dividing each first sub-groove 1136 into a plurality of first sub-grooves 1137 arranged along the X direction, the electrolyte can simultaneously enter the receiving chamber 51 from the plurality of first sub-grooves 1137 and the first flow guide hole 116 provided in each first sub-groove 1137, thereby further improving the speed of flowing into the energy storage device 100 and improving the injection speed. Furthermore, in this embodiment, by arranging the plurality of first sub-grooves 1137 in sequence along the Y direction, and each first sub-groove 1137 having the same size along the Y direction, the electrolyte is more evenly distributed in the receiving chamber 51, thereby improving the wetting speed and wetting effect of the electrode assembly 70.

[0095] It should be noted that during the assembly and transportation of the energy storage device 100, the electrolyte inside the energy storage device 100 may shake due to transportation problems, which may cause the electrolyte to enter the gap between the insulating member 10 and the end cover 20. Part of the electrolyte that enters the gap between the insulating member 10 and the end cover 20 from the receiving cavity 51 flows back into the receiving cavity 51 through the first guide groove 113 and the first guide hole 116, part of the electrolyte flows back into the receiving cavity 51 through the groove 133 and the through hole 134, and part of the electrolyte flows back into the receiving cavity 51 through the second guide groove 123 and the second guide hole 128.

[0096] In this embodiment, by respectively providing the first guide groove 113 and the second guide groove 123 on opposite sides of the length direction of the insulating member 10, the speed of the electrolyte returning to the interior of the energy storage device 100 can be increased, and the electrolyte can be prevented from staying on the first surface 101, thereby avoiding waste of the electrolyte.

[0097] At the same time, in this embodiment, by setting the first side wall 1331 and the second side wall 1332 of the groove 133 as inclined surfaces, the electrolyte between the insulating member 10 and the end cover 20 can smoothly flow along the first side wall 1331 and the second side wall 1332 into the groove 133 and flow into the interior of the energy storage device 100, thereby improving the reflux rate of the electrolyte, that is, most of the electrolyte or all of the electrolyte can flow back to the interior of the energy storage device 100, reducing or even avoiding electrolyte residue, thereby improving the utilization rate of the electrolyte.

[0098] It should be further explained that, during the long-term storage of the energy storage device 100, the middle area along the width direction of the insulating member 10 will bend toward the inside of the energy storage device 100 due to the effect of gravity, that is, it will collapse toward the negative direction of the Z axis, which will cause the gap between the middle area along the width direction of the insulating member 10 and the end cover 20 to increase. When the electrolyte inside the energy storage device 100 is shaken due to transportation problems, it will enter the gap between the insulating member 10 and the end cover 20, and most of the electrolyte is concentrated in the middle area along the width direction of the insulating member 10.

[0099] In this embodiment, the second guide groove 123 is divided into a plurality of second sub-grooves 126 arranged along the Y direction, and the size of the second sub-grooves 126 located in the middle of the second guide groove 123 is larger than the size of the second sub-grooves 126 located on both sides, so that the electrolyte concentrated in the middle area in the width direction of the insulating member 10 can flow back to the interior of the energy storage device 100 through the second sub-grooves 126 with larger sizes, thereby increasing the speed at which the electrolyte flows back to the interior of the energy storage device 100, and further preventing the electrolyte from staying on the first surface 101, thereby further avoiding waste of the electrolyte.

[0100] The energy storage device 100 provided in the embodiment of the present application is provided with a first guide groove 113 and a second guide groove 123 on opposite sides of the length direction of the insulating member 10, respectively, and the sizes of the plurality of first sub-grooves 1136 in the first guide groove 113 are the same, and the size of the second sub-grooves 126 located in the middle of the second guide groove 123 is larger than the sizes of the second sub-grooves 126 located on both sides. This can ensure the flow speed and flow uniformity of the electrolyte entering between the insulating member 10 and the end cover 20 to the inside of the energy storage device 100 during the injection of the electrolyte, while improving the reflux speed of the electrolyte entering between the insulating member 10 and the end cover 20 to flow back to the inside of the energy storage device 100 during the transportation of the energy storage device 100.

[0101] See also Fig.12 , Fig.12 1 is a schematic diagram of the structure of the insulating member 10 in the energy storage device 100 provided in the second embodiment of the present application.

[0102] The insulating member 10 in this embodiment is Figure 6 The difference of the insulating member 10 in the illustrated embodiment is that, in this embodiment, along the width direction of the insulating member 10, the size of the second sub-groove 126 in the middle position along the Y direction is smaller than the size of the second sub-grooves 126 in the two side positions along the Y direction.

[0103] See also Fig.13 , Fig.13 It is a schematic structural diagram of the insulating member 10 in the energy storage device 100 provided in the third embodiment of the present application.

[0104] The insulating member 10 in this embodiment is Figure 6 The difference of the insulating member 10 in the illustrated embodiment is that, in this embodiment, the first guide groove 113 and the second guide groove 123 are symmetrically arranged about the first center line P2. The dimensions of the plurality of first sub-grooves 1136 along the Y direction are all the same, and the dimensions of the plurality of second sub-grooves 126 along the Y direction are all the same. In this way, the structure of the insulating member 10 can be simplified and the production cost of the insulating member 10 can be reduced.

[0105] 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 first guide groove, a liquid injection hole and a second guide groove; the first guide groove, the liquid injection hole and the second guide groove are sequentially arranged at intervals along the first direction; the openings of the first guide groove and the second guide groove are both located on the first surface, and the liquid injection hole passes through the first surface and the second surface along the thickness direction of the insulating member; The first guide groove comprises a plurality of first sub-grooves spaced apart along the second direction, the bottom wall of each of the first sub-grooves being provided with at least one first guide hole, and the first guide hole penetrates the bottom wall of the first sub-groove; The second guide groove comprises a plurality of second sub-grooves spaced apart along the second direction, the bottom wall of each second sub-groove being provided with at least one second guide hole, and the second guide hole penetrates the bottom wall of the second sub-groove; The first direction is perpendicular to the second direction.

2. The insulating member according to claim 1, characterized in that The insulating member has a first center line, the first center line is parallel to the second direction, and the distances from the second center line to two opposite edges of the insulating member along the first direction are equal; the first guide groove and the second guide groove are asymmetrically arranged about the first center line.

3. The insulating member according to claim 2, characterized in that: The sizes of the plurality of first sub-grooves along the second direction are the same; along the second direction, the sizes of the second sub-grooves near the middle position along the second direction are different from the sizes of the second sub-grooves near the two side positions along the second direction.

4. The insulating member according to claim 1, characterized in that: Along the second direction, a size of the second sub-groove near the middle position along the second direction is greater than a size of the second sub-groove near the two side positions along the second direction.

5. The insulating member according to claim 1, characterized in that: The sizes of the plurality of first sub-grooves along the second direction are the same; the sizes of the plurality of second sub-grooves along the second direction are the same.

6. The insulating member according to any one of claims 1 to 5, characterized in that: The insulating part includes an explosion-proof part, which is provided with a groove, the opening of which is located on the first surface, and the groove is located between the injection hole and the second guide groove; the bottom wall of the groove is provided with a through hole, and the through hole passes through the second surface; the explosion-proof part is used to be arranged opposite to the explosion-proof valve of the energy storage device.

7. The insulating member according to claim 6, characterized in that: The insulating member includes a first partition plate, which is arranged in the first guide groove along the width direction of the insulating member and is spaced apart from two opposite side walls of the first guide groove along the length direction of the insulating member.

8. The insulating member according to claim 6, characterized in that: The insulating member has a second center line, which is parallel to the length direction of the insulating member, and the distances from the second center line to two opposite edges of the insulating member in the width direction are equal; and a plurality of the second sub-grooves are symmetrically arranged about the second center line.

9. The insulating member according to claim 6, characterized in that: The insulating part includes a first connecting part and a first guide part, the first guide part, the first connecting part and the explosion-proof part are connected in sequence along the first direction, the first guide groove is arranged in the first guide part, and the injection hole is arranged in the first connecting part; the first surface is a plane, and the thickness of the first guide part is greater than or equal to the thickness of the first connecting part.

10. The insulating member according to claim 9, characterized in that The insulating member further includes a second connecting portion and a second guide portion, wherein the second connecting portion is connected to a side of the explosion-proof portion facing away from the first connecting portion, and the second guide portion is connected to a side of the second connecting portion facing away from the explosion-proof portion; the second guide groove is provided in the second guide portion; The thickness of the second guide portion is greater than or equal to the thickness of the second connecting portion and the thickness of the first connecting portion.

11. The insulating member according to claim 6, characterized in that The insulating member is provided with a first through hole and a second through hole, and the first through hole and the second through hole both penetrate the first surface and the second surface along the thickness direction of the insulating member; The first through hole is disposed between the injection hole and the first guide groove, and is spaced apart from the injection hole and the first guide groove; the second through hole is disposed between the groove and the second guide groove, and is spaced apart from the 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 described in any one of claims 1 to 11, the end cover is provided with an injection through hole, the injection through hole penetrates the end cover along the thickness direction of the end cover, along the thickness direction of the end cover assembly, the insulating member and the end cover are stacked and fixedly connected, the first surface faces the end cover, and the injection hole and the injection through hole are arranged opposite to each other and are connected to each other.

13. The end cap assembly according to claim 12, characterized in that: The end cover is also provided with an explosion-proof hole, and the explosion-proof hole and the injection hole are spaced apart along the first direction; 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 and is spaced apart from the bottom wall of the groove.

14. The end cap assembly according to claim 13, characterized in that: The end cover is further provided with a first pole through hole and a second pole through hole, the first pole through hole and the second pole through hole are arranged at intervals along the first direction, and along the thickness direction of the end cover assembly, the first pole through hole is arranged opposite to the first through hole of the insulating member and are connected to each other, and the second pole through hole is arranged opposite to the second through hole of the insulating member and are connected to each other; The end cover assembly further includes a first pole and a second pole, wherein the first pole is inserted through the first pole through hole and the first through hole, and the second pole is inserted through the second pole through hole and the second through hole.

15. An energy storage device, characterized in that: It comprises a shell, an electrode assembly and an end cap assembly as described in any one of claims 12 to 14, 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, and is fixedly connected to the shell.

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

Images