End cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises an end plate, lower plastic, a pole, an adapter and a heat insulation part. The end plate is provided with a first via hole penetrating through the end plate in the thickness direction of the end plate. The lower plastic is arranged on one side of the end plate; the lower plastic cement is provided with a second via hole, a first sinking groove and a third via hole, the second via hole corresponds to the first via hole in position, and the second via hole penetrates through the lower plastic cement in the thickness direction of the end plate; the first sinking groove is recessed from the side surface, facing the end plate, of the lower plastic part to the side surface, back to the end plate, of the lower plastic part. The third via hole penetrates through the groove bottom face of the first sinking groove and the side surface, back to the end plate, of the lower plastic part. The pole is limited in the first through hole and the second through hole; the adapter is arranged on one side, opposite to the end plate, of the lower plastic and is electrically connected with the pole; the adapter is provided with a welding part corresponding to the third via hole in the thickness direction of the end plate; the heat insulation piece comprises a body and a protruding part, the body penetrates through the third via hole, and the protruding part is arranged on the periphery of the body and located in the first sinking groove.

Description

Technical Field

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

[0002] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to activate the active materials and continue to be used after being discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher requirements for their energy density, reliability and cost.

[0003] In the related art, a secondary battery includes an end cap assembly, an electrode assembly and a shell. The actual production process is to separately manufacture the end cap assembly, the electrode assembly and the shell, and then use an adapter to weld the end cap assembly and the electrode assembly respectively, and then put the electrode assembly into the shell, and then use the end cap assembly to cover the opening of the shell and weld and seal it to form the basic structure of the secondary battery.

[0004] The end cap assembly includes an end plate, a pole, and a lower plastic. The pole is mounted on the end plate, the adapter is welded to the pole and the pole lug of the electrode assembly, and the lower plastic is used to insulate the adapter and the end plate. However, since the lower plastic is usually made of PP (polypropylene), a large amount of heat will be generated instantly when the adapter is welded to the pole lug, which can easily cause the lower plastic to melt and deform, affecting its insulation effect. Utility Model Content

[0005] The embodiments of the present application provide an end cover assembly, an energy storage device, and an electrical device that can prevent welding heat from being transferred to the lower plastic.

[0006] The end cap assembly of the embodiment of the present application includes:

[0007] The end plate has a first through hole, wherein the first through hole penetrates the end plate along the thickness direction of the end plate;

[0008] The lower plastic is arranged on one side of the end plate in the thickness direction; the lower plastic has a second through hole, a first recessed groove and a third through hole, the second through hole corresponds to the position of the first through hole, and the second through hole penetrates the lower plastic along the thickness direction of the end plate; the first recessed groove is recessed from a side surface of the lower plastic facing the end plate to a side surface facing away from the end plate, and the third through hole penetrates the bottom surface of the first recessed groove and a side surface of the lower plastic facing away from the end plate;

[0009] A pole, limited to be located in the first through hole and the second through hole;

[0010] A transition piece is provided on a side of the lower plastic facing away from the end plate and is electrically connected to an axial end of the pole; the transition piece has a welding portion, and the welding portion corresponds to the third via hole along the thickness direction of the end plate; and

[0011] The heat insulating member comprises a main body and a protruding portion, wherein the main body is penetrated through the third through hole, and the protruding portion is protruded from the outer periphery of the main body and is located in the first sink groove.

[0012] In an embodiment of the present application, the end cover assembly includes a thermal insulation member having a main body and a protrusion. The main body is passed through the third through hole to correspond to the position of the welding portion of the adapter, and the protrusion is located in the first groove. On the one hand, the thermal insulation member can block the welding heat generated by the welding portion during welding from being transferred to the lower plastic, thereby reducing the risk of the lower plastic melting and deforming due to heat, and ensuring the insulation performance of the lower plastic; on the other hand, the thermal insulation member can be firmly installed in the first groove of the lower plastic to avoid misalignment of the thermal insulation member during assembly of the end cover assembly, thereby affecting its effect of blocking welding heat.

[0013] Optionally, the protrusion is annular and is connected to the outer circumference of the body in a surrounding manner.

[0014] In the embodiment of the present application, since the protrusion is connected to the outer peripheral surface of the main body in a surrounding manner, the supporting force of the lower plastic on the thermal insulation member is evenly distributed, ensuring that the thermal insulation member maintains a posture parallel to the end plate.

[0015] Optionally, a side surface of the protrusion facing the end plate is flush with a side surface of the body facing the end plate.

[0016] In the embodiment of the present application, the depth of the first groove of the lower plastic only needs to be equal to or slightly greater than the thickness of the protrusion to achieve the installation of the thermal insulation component in the first groove. At this time, the depth of the first groove does not need to be set too deep to avoid affecting the structural strength of the lower plastic.

[0017] Optionally, the end plate has a first positioning portion, and the thermal insulation component has a second positioning portion positioned and matched with the first positioning portion.

[0018] In the embodiment of the present application, the thermal insulation member and the end plate are positioned and matched by the first positioning portion and the second positioning portion, which can further prevent the thermal insulation member from being misaligned with respect to the end plate.

[0019] Optionally, one of the first positioning portion and the second positioning portion is a positioning protrusion, and the other is a positioning hole, and the positioning protrusion is located in the positioning hole.

[0020] In the embodiment of the present application, the positioning connection is achieved through the positioning protrusions and the positioning holes, which makes it easier for assembly workers to assemble the thermal insulation components and the end plates.

[0021] Optionally, the adapter comprises:

[0022] an annular component, at least a portion of which is located in the second through hole and abuts against a step surface on the outer periphery of the pole; and

[0023] The base is arranged on a side of the lower plastic facing away from the end plate and is electrically connected to the annular component. The base has the welding portion.

[0024] Optionally, the annular component and the base are an integral structure.

[0025] In the embodiment of the present application, the annular component and the base are an integral structure, so that the pole, end plate, lower plastic and adapter can be assembled by one manufacturer to form an end cover assembly, avoiding the problem of rotation or displacement of the base affecting the welding quality.

[0026] Optionally, the end plate further has a second sink groove, the second sink groove is recessed from a side surface of the end plate facing the lower plastic to a side surface facing away from the lower plastic, and the first via hole passes through the bottom surface of the second sink groove;

[0027] Part of the annular component is located in the second sink.

[0028] In the embodiment of the present application, the end plate is provided with a second recessed groove, so that part of the annular component can extend into the second recessed groove, thereby reducing the thickness of the end plate assembly, which is beneficial to improving the energy density of the energy storage device.

[0029] Optionally, the lower plastic includes an insulating sheet and an insulating protruding ring, the insulating sheet has the second via hole, the first recessed groove and the third via hole, the insulating protruding ring is arranged at the edge of the second via hole and surrounds the outer circumference of the pole; the insulating protruding ring is protruding from the side surface of the insulating sheet facing the end plate and is located in the second recessed groove.

[0030] In the embodiment of the present application, the end plate is provided with a second recessed groove, so that the insulating protruding ring can extend into the second recessed groove, thereby reducing the thickness of the end plate assembly, which is beneficial to improving the energy density of the energy storage device.

[0031] Optionally, the thermal insulation element is made of ceramic material.

[0032] In the embodiment of the present application, the thermal insulation member is made of ceramic material, so that the thermal insulation member can take into account both insulation performance and heat insulation performance.

[0033] The energy storage device of the embodiment of the present application includes:

[0034] an electrode assembly having a tab; and

[0035] In the end cover assembly described in any of the above items, the welding portion of the adapter of the end cover assembly is welded to the pole ear.

[0036] The electrical equipment of the embodiment of the present application includes the above-mentioned energy storage device, and the energy storage device is used to supply power to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of a household energy storage system according to an exemplary embodiment.

[0038] Figure 2 Shown is a schematic diagram of an exploded view of an energy storage device according to an embodiment of the present application.

[0039] Figure 3 Shown is a schematic diagram of an exploded view of an end cover assembly according to an embodiment of the present application.

[0040] Figure 4 It is shown that Figure 2 Section view along AA.

[0041] Figure 5 Shown is a three-dimensional schematic diagram of a heat insulating component according to an embodiment of the present application.

[0042] Figure 6 Shown is a three-dimensional schematic diagram of an end plate according to an embodiment of the present application.

[0043] Figure 7 Shown is a schematic diagram of an electrical device according to an embodiment of the present application.

[0044] The reference numerals are described as follows:

[0045] 1. Energy storage device; 2. Electric energy conversion device; 3. User load; 4. Electrical equipment;

[0046] 10. End cap assembly; 20. Electrode assembly; 21. Tab; 30. Shell; 31. Accommodating cavity; 32. Opening;

[0047] 100, end plate; 101, first surface; 102, second surface; 110, first via hole; 120, second sink; 130, air leakage hole; 140, injection hole;

[0048] 200, lower plastic; 210, second via hole; 220, first sink; 230, third via hole; 240, insulating sheet; 241, third surface; 242, fourth surface; 250, insulating convex ring;

[0049] 300, pole; 310, step surface;

[0050] 400, adapter; 401, welding portion; 410, base; 420, annular member;

[0051] 500, thermal insulation member; 510, body; 520, protrusion;

[0052] 600, positioning structure; 610, positioning hole; 620, positioning protrusion;

[0053] 700, seal; 800, plastic coating; 900, explosion-proof valve;

[0054] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0056] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or components that are inherent to these processes, methods, products, or devices.

[0057] 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 way or convert it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0058] 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:

[0059] (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;

[0060] (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.

[0061] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1 A household energy storage system is shown, which includes an energy storage device 1 and an electric energy conversion device 2 (such as a photovoltaic panel), and a user load 3 (such as a street lamp, household appliances, etc.). The energy storage device 1 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 2 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 1, and then supply the user load 3 for use during the peak electricity price, or supply the user load 3 for use when the power grid is out of power / power outage.

[0062] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0063] The embodiment of the present application provides an energy storage device 1, which can be but is not limited to a single cell (secondary battery), a battery module composed of single cells, a battery pack, an energy storage box, an energy storage system, etc. As for the single cell, it can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The single cell can be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this. Next, taking the energy storage device 1 as a square single cell as an example, the energy storage device 1 is explained in detail.

[0064] like Figure 2As shown, the energy storage device 1 of the embodiment of the present application includes an end cap assembly 10, an electrode assembly 20 and a shell 30. The shell 30 includes a receiving cavity 31 with an opening 32, the electrode assembly 20 is received in the receiving cavity 31, and the end cap assembly 10 seals the opening 32 of the receiving cavity 31.

[0065] The shell 30 may be a cylindrical structure with an opening 32 at one end, and the energy storage device 1 includes an end cover assembly 10, through which the opening 32 of the shell 30 is sealed. Of course, in other embodiments, the shell 30 may also be a cylindrical structure with openings 32 at both ends, and the energy storage device 1 includes an end cover assembly 10 and a cover plate, or includes two end cover assemblies 10, so that the two openings 32 of the shell 30 are sealed respectively by an end cover assembly 10 and a cover plate, or two end cover assemblies 10.

[0066] Optionally, the shell 30 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0067] Among them, the electrode assembly 20 includes a positive electrode sheet, a negative electrode sheet and a separator. The single cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon. The material of the isolation film may be PP or PE, etc. In addition, the electrode assembly 20 may be a winding structure or a stacked structure, but the embodiment of the present application is not limited thereto.

[0068] like Figure 3 and Figure 4As shown, the end cap assembly 10 includes an end plate 100, a lower plastic 200, a pole 300, an adapter 400 and a heat insulating member 500. The end plate 100 has a first through hole 110, and the first through hole 110 penetrates the end plate 100 along the thickness direction of the end plate 100; the lower plastic 200 is arranged on one side of the thickness direction of the end plate 100; the lower plastic 200 has a second through hole 210, a first recessed groove 220 and a third through hole 230, and the second through hole 210 corresponds to the position of the first through hole 110, and the second through hole 210 penetrates the lower plastic 200 along the thickness direction of the end plate 100; the first recessed groove 220 is recessed from the side surface of the lower plastic 200 facing the end plate 100 to the side surface facing away from the end plate 100, and the third through hole 230 penetrates the first recessed groove 220. 0 and the side surface of the lower plastic 200 facing away from the end plate 100; the pole 300 is limited in the first through hole 110 and the second through hole 210; the adapter 400 is arranged on the side of the lower plastic 200 facing away from the end plate 100, and is electrically connected to one axial end of the pole 300; the adapter 400 has a welding portion 401, and the welding portion 401 corresponds to the third through hole 230 along the thickness direction of the end plate 100; the heat insulating member 500 includes a main body 510 and a protruding portion 520, the main body 510 is penetrated by the third through hole 230, and the protruding portion 520 is protruded from the outer periphery of the main body 510 and is located in the first sink groove 220.

[0069] In the embodiment of the present application, the end cover assembly 10 includes a thermal insulation member 500 having a main body 510 and a protrusion 520. The main body 510 is passed through the third through hole 230 to correspond to the position of the welding portion 401 of the adapter 400. The protrusion 520 is located at the bottom surface of the first groove 220. On the one hand, the thermal insulation member 500 can prevent the welding portion 401 from directly contacting the lower plastic 200, thereby blocking the welding heat generated by the welding portion 401 during welding from being transferred to the lower plastic 200, reducing the risk of the lower plastic 200 melting and deforming due to heat, and ensuring the insulation performance of the lower plastic 200; on the other hand, the thermal insulation member 500 can be firmly installed in the first groove 220 of the lower plastic 200 to avoid the thermal insulation member 500 from being misplaced during the assembly of the end cover assembly 10, thereby affecting its effect of blocking welding heat.

[0070] In one embodiment, the thermal insulation member 500 is made of a ceramic material, so that the thermal insulation member 500 can have both insulating properties and heat-insulating properties.

[0071] Among them, the end plate 100 is connected to the shell 30 and seals the opening 32 of the accommodating cavity 31. The connection method between the end plate 100 and the shell 30 can be welding, but it is not limited to this. The shape of the end plate 100 is adapted to the shape of the opening 32. In the embodiment of the present application, the shape of the opening 32 is rectangular, so the shape of the end plate 100 is also rectangular. For the convenience of explanation, the length direction of the end plate 100 is defined as the first direction D1, the width direction of the end plate 100 is defined as the second direction D2, and the thickness direction of the end plate 100 is defined as the third direction D3. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other.

[0072] The end plate 100 has a first surface 101 and a second surface 102 disposed opposite to each other along a third direction D3, and a first via hole 110 of the end plate 100 penetrates the first surface 101 and the second surface 102 along the third direction D3. In the embodiment of the present application, the end plate 100 has two first via holes 110, and the two first via holes 110 are disposed opposite to each other along the first direction D1.

[0073] The end plate 100 further has an air leakage hole 130 , which penetrates the first surface 101 and the second surface 102 along the third direction D3 . The air leakage hole 130 may be located between the two first via holes 110 .

[0074] The end plate 100 further has a second groove 120 , which is recessed from a side surface (second surface 102 ) of the end plate 100 facing the lower plastic 200 to a side surface (first surface 101 ) facing away from the lower plastic 200 . The first via 110 passes through the bottom surface of the second groove 120 .

[0075] Please continue reading Figure 3 and Figure 4 , the end cap assembly 10 further includes an explosion-proof valve 900, which is disposed on the side of the end plate 100 facing the electrode assembly 20 and is used to close the air leakage hole 130. In the embodiment of the present application, the explosion-proof valve 900 is welded in a sink groove of the end plate 100, and the sink groove is recessed from the second surface 102 of the end plate 100 along the third direction D3 toward the first surface 101, but is not limited thereto. The explosion-proof valve 900 is used to explode and discharge the gas generated in the accommodating cavity 31 of the shell 30 when the air pressure in the energy storage device 1 reaches a certain pressure threshold, so as to avoid bulging or even explosion of the energy storage device 1, thereby improving the safety of the energy storage device 1.

[0076] The end plate 100 also has a liquid injection hole 140, and the liquid injection hole 140 passes through the first surface 101 and the second surface 102 along the third direction D3. After the end cover assembly 10 seals the opening 32 of the accommodating cavity 31, the electrolyte can be injected into the accommodating cavity 31 through the liquid injection hole 140. After the electrolyte is injected, the liquid injection hole 140 can be sealed with a sealing plug to prevent leakage of the electrolyte.

[0077] The lower plastic 200 is attached to the second surface 102 of the end plate 100 and is made of an insulating material, such as PP (polypropylene), but not limited thereto.

[0078] The lower plastic 200 includes an insulating sheet 240 and an insulating protruding ring 250. The insulating sheet 240 may be a rectangular plate-shaped structure, and has a third surface 241 and a fourth surface 242 disposed opposite to each other along a third direction D3. The third surface 241 of the insulating sheet 240 is attached to the second surface 102 of the end plate 100, and the fourth surface 242 of the insulating sheet 240 is opposite to the second surface 102.

[0079] The insulating sheet 240 has a second via 210, a first sink 220 and a third via 230. The second via 210 corresponds to the position of the first via 110, and the second via 210 passes through the third surface 241 and the fourth surface 242 along the third direction D3. In the embodiment of the present application, the insulating sheet 240 has two second vias 210, and the two second vias 210 correspond to the positions of the two first vias 110, respectively. Among them, the pole 300 is limited in the first via 110 and the second via 210. In the embodiment of the present application, the number of poles 300 is two, one of which serves as the positive lead-out terminal of the energy storage device 1, and the other pole 300 serves as the negative lead-out terminal of the energy storage device 1.

[0080] The end plate 100 assembly further includes an upper plastic 800, and the outer periphery of each pole 300 is also sleeved with the upper plastic 800, and the upper plastic 800 is limited in the first through hole 110 to insulate the pole 300 and the end plate 100. In one embodiment, the upper plastic 800 is made of an insulating material, such as PP (polypropylene), but is not limited thereto.

[0081] The insulating protruding ring 250 is disposed at the edge of the second through hole 210 and surrounds the outer circumference of the pole 300 ; the insulating protruding ring 250 is protruding from a side surface (third surface 241 ) of the insulating sheet 240 facing the end plate 100 and is located in the second sink 120 .

[0082] In one embodiment, if Figure 3 As shown, a third via hole 230 is provided on both sides of the second direction D2 of each second via hole 210 of the lower plastic 200, and a heat insulating member 500 is provided in each third via hole 230. In other words, one pole 300 corresponds to two heat insulating members 500, and the two heat insulating members 500 correspond to two welding portions 401 of the adapter 400. When the two welding portions 401 of the adapter 400 are welded to the pole lug 21 of the electrode assembly 20, the two heat insulating members 500 can both play a role in blocking welding heat.

[0083] In the embodiment of the present application, the heat insulating member 500 is a rectangular plate-shaped structure. Of course, in other embodiments, the heat insulating member 500 can also be an arc-shaped segment, and the arc-shaped heat insulating member 500 partially surrounds the second via hole 210 .

[0084] Please continue reading Figure 3 and Figure 4 The end cover assembly 10 also includes a seal 700, which is accommodated in the second groove 120 of the end plate 100 and is arranged between the bottom surface of the second groove 120 and the adapter 400, and is used to seal the gap between the end plate 100 and the adapter 400 to prevent water vapor and / or dust outside the energy storage device 1 from entering the accommodating cavity 31 through the gap.

[0085] In one embodiment, the sealing member 700 is a sealing ring, and a sealing ring is sleeved on the outer circumference of a pole 300 .

[0086] like Figure 5 As shown, the protrusion 520 of the thermal insulation member 500 is annular and is connected to the outer peripheral surface of the body 510 in a surrounding manner.

[0087] In the embodiment of the present application, since the protrusion 520 is connected to the outer peripheral surface of the main body 510 in a surrounding manner, the supporting force of the lower plastic 200 on the thermal insulation member 500 is evenly distributed, ensuring that the thermal insulation member 500 maintains a posture parallel to the end plate 100.

[0088] The side surface of the protrusion 520 facing the end plate 100 is flush with the side surface of the body 510 facing the end plate 100, and the protrusion 520 and the body 510 are in contact with the end plate 100. In other words, the protrusion 520 is arranged at the end of the body 510 along the third direction D3. The advantage of such a setting is that the depth of the first sinking groove 220 of the lower plastic 200 only needs to be equal to or slightly greater than the thickness of the protrusion 520, so that the heat insulation member 500 can be installed in the first sinking groove 220. At this time, the depth of the first sinking groove 220 does not need to be set too deep to avoid affecting the structural strength of the lower plastic 200.

[0089] Of course, in other embodiments, the protrusion 520 may not be disposed at the end of the body 510 along the third direction D3, but may be disposed in the middle area of ​​the body 510 along the third direction D3.

[0090] In addition, the number of the protrusions 520 can also be multiple, for example, the protrusions 520 are block-shaped. When the number of the protrusions 520 is multiple, the multiple protrusions 520 are arranged at intervals along the circumference of the body 510. For example, Figure 5As shown, the body 510 may be in the shape of a rectangular plate, and has two first side surfaces 511 and two second side surfaces 512. The two first side surfaces 511 are arranged opposite to each other along a first direction D1, and the two second side surfaces 512 are arranged opposite to each other along a second direction D2. A protrusion 520 is provided on the first side surface 511 and / or the second side surface 512.

[0091] Furthermore, the number of the protrusions 520 disposed on the first side surface 511 may be one or more, and the number of the protrusions 520 disposed on the second side surface 512 may be one or more.

[0092] like Figure 5 and Figure 6 As shown, a positioning structure 600 is provided between the heat insulating member 500 and the end plate 100. By providing the positioning structure 600 between the heat insulating member 500 and the end plate 100, the heat insulating member 500 can be further prevented from being misaligned relative to the end plate 100.

[0093] In one embodiment, the positioning structure 600 includes a first positioning portion 610a and a second positioning portion 620a, and the first positioning portion 610a and the second positioning portion 620a are positioned and matched. The end plate 100 has the first positioning portion 610a, and the heat insulating member 500 has the second positioning portion 620a.

[0094] As an example, one of the first positioning portion 610 a and the second positioning portion 620 a is a positioning protrusion 620 , and the other is a positioning hole 610 , and at least a portion of the positioning protrusion 620 is located in the positioning hole 610 .

[0095] In the embodiment of the present application, the positioning protrusion 620 and the positioning hole 610 are used for positioning and connection, so as to facilitate the assembly workers to assemble the thermal insulation member 500 and the end plate 100 .

[0096] In one embodiment, the positioning hole 610 is provided on the end plate 100, and the positioning protrusion 620 is provided on the thermal insulation member 500. The positioning protrusion 620 may be provided on the body 510 of the thermal insulation member 500; or, the protrusion 520 of the thermal insulation member 500 may be provided with the positioning protrusion 620; or, both the body 510 and the protrusion 520 are provided with the positioning protrusion 620.

[0097] It is understandable that the number of corresponding positioning holes 610 and positioning protrusions 620 included in the positioning structure 600 can be one group or multiple groups. When the positioning structure 600 includes a group of matching positioning holes 610 and positioning protrusions 620, the shape of the positioning hole 610 is non-circular, such as rectangular, elliptical, triangular, etc. The cross-sectional shape of the positioning protrusion 620 is adapted to the shape of the positioning hole 610 so that the positioning protrusion 620 is inserted into the positioning hole 610. When the positioning structure 600 includes multiple groups of matching positioning holes 610 and positioning protrusions 620, the shape of the positioning hole 610 can be circular or non-circular, and the cross-sectional shape of the positioning protrusion 620 is adapted to the shape of the positioning hole 610.

[0098] In the embodiment of the present application, the positioning structure 600 includes two groups of positioning holes 610 and positioning protrusions 620 . The positioning holes 610 are circular in shape, and the positioning protrusions 620 are cylindrical in shape, but the present invention is not limited thereto.

[0099] It is understandable that the first positioning portion 610a and the second positioning portion 620a are not limited to the positioning and matching structure of the protrusion and the hole. For example, in another embodiment, the first positioning portion 610a is a groove, and the groove is recessed from the second surface 102 of the end plate 100 along the second direction D2 to the first surface 101, and the second positioning portion 620a is the outer periphery of the protrusion 520, and a part of the protrusion 520 and a part of the body 510 are located in the groove, and the outer periphery of the protrusion 520 is positioned and matched with the groove wall of the groove; in another embodiment, the first positioning portion 610a and the second positioning portion 620a are magnets with opposite polarities, and the two magnets attract each other, thereby realizing the positioning between the thermal insulation 500 and the end plate 100.

[0100] like Figure 3 and Figure 4 As shown, the adapter 400 includes a base 410 and an annular component 420. At least a portion of the annular component 420 is located in the second through hole 210, and the annular component 420 abuts against the step surface 310 on the outer periphery of the pole 300, so that the pole 300 is limited in the first through hole 110 of the end plate 100. The base 410 is arranged on the side of the lower plastic 200 facing away from the end plate 100, and is electrically connected to the annular component 420. The base 410 has a welding portion 401, through which the base 410 can be electrically connected to the pole ear 21 of the electrode assembly 20.

[0101] The connection between the annular component 420 and the pole 300 may be achieved through a welding process, such as laser welding, but not limited thereto.

[0102] In one embodiment, the annular component 420 and the base 410 are an integral structure. In other words, the adapter 400 is a component that can not only limit the pole 300, but also connect the pole 300 and the electrode assembly 20.

[0103] In the embodiment of the present application, the annular component 420 and the base 410 are an integral structure, so that the pole 300, the end plate 100, the lower plastic 200 and the adapter 400 can be assembled by a manufacturer to form the end cover assembly 10, avoiding the problem of rotation or displacement of the base 410 affecting the welding quality.

[0104] like Figure 4 As shown, part of the annular component 420 is located in the second sinking groove 120. It is understandable that the end plate 100 is provided with the second sinking groove 120, so that the insulating protruding ring 250 and part of the annular component 420 can both extend into the second sinking groove 120, thereby reducing the thickness of the end cover assembly 10, which is beneficial to improving the energy density of the energy storage device 1.

[0105] like Figure 7 As shown, an embodiment of the present application further provides an electric device 4 , which includes the energy storage device 1 described in the above embodiment, and the energy storage device 1 supplies power to the electric device 4 .

[0106] The electrical equipment 4 may include but is not limited to: vehicles, household appliances, industrial equipment, etc.

[0107] It is understandable that the various embodiments / implementations provided in the present application can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0108] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0109] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0110] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0111] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. An end cap assembly, characterized in that: include: The end plate has a first through hole, wherein the first through hole penetrates the end plate along the thickness direction of the end plate; A lower plastic, arranged on one side of the end plate in the thickness direction; The lower plastic has a second via hole, a first sink and a third via hole, the second via hole corresponds to the position of the first via hole, and the second via hole penetrates the lower plastic along the thickness direction of the end plate; The first sink groove is recessed from a side surface of the lower plastic toward the end plate to a side surface facing away from the end plate, and the third through hole penetrates the bottom surface of the first sink groove and a side surface of the lower plastic facing away from the end plate; A pole, limited to be located in the first through hole and the second through hole; A transition piece is provided on a side of the lower plastic facing away from the end plate and is electrically connected to an axial end of the pole; the transition piece has a welding portion, and the welding portion corresponds to the third via hole along the thickness direction of the end plate; and The heat insulating member comprises a main body and a protruding portion, wherein the main body is penetrated through the third through hole, and the protruding portion is protruded from the outer periphery of the main body and is located in the first sink groove.

2. The end cap assembly according to claim 1, characterized in that: The protrusion is annular and is connected to the outer peripheral surface of the body in a surrounding manner.

3. The end cap assembly according to claim 1, characterized in that: A side surface of the protrusion facing the end plate is flush with a side surface of the body facing the end plate.

4. The end cap assembly according to claim 1, characterized in that: The end plate has a first positioning portion, and the heat insulating member has a second positioning portion positioned and matched with the first positioning portion.

5. The end cap assembly according to claim 4, characterized in that: One of the first positioning portion and the second positioning portion is a positioning protrusion, and the other is a positioning hole. At least a portion of the positioning protrusion is located in the positioning hole.

6. The end cap assembly according to claim 1, characterized in that: The adapter comprises: an annular component, at least a portion of which is located in the second through hole and abuts against a step surface on the outer periphery of the pole; and The base is arranged on a side of the lower plastic facing away from the end plate and is electrically connected to the annular component. The base has the welding portion.

7. The end cap assembly according to claim 6, characterized in that: The annular component and the base are an integral structure.

8. The end cap assembly according to claim 6, characterized in that: The end plate further has a second sink groove, the second sink groove is recessed from a side surface of the end plate facing the lower plastic to a side surface facing away from the lower plastic, and the first via hole penetrates the bottom surface of the second sink groove; Part of the annular component is located in the second sink.

9. The end cap assembly according to claim 8, characterized in that: The lower plastic includes an insulating sheet and an insulating convex ring, the insulating sheet has the second via hole, the first recessed groove and the third via hole, the insulating convex ring is arranged at the edge of the second via hole and surrounds the outer circumference of the pole; the insulating convex ring is convexly arranged on the side surface of the insulating sheet facing the end plate and is located in the second recessed groove.

10. The end cap assembly according to any one of claims 1 to 9, characterized in that: The heat insulating member is made of ceramic material.

11. An energy storage device, characterized in that: include: An electrode assembly having a tab; as well as According to any one of claims 1 to 10, the welding portion of the adapter of the end cover assembly is welded to the pole ear.

12. An electrical equipment, characterized in that: It includes the energy storage device as described in claim 11, and the energy storage device is used to supply power to the electrical equipment.

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