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, and relates to the technical field of energy storage. The end cover assembly comprises a cover plate; the insulating part is located on one side of the cover plate and comprises a first insulating part and a second insulating part, the first insulating part and the second insulating part are provided with a first lap joint part and a second lap joint part respectively, the first insulating part is in lap joint with the second lap joint part, and the second insulating part is in lap joint with the first lap joint part; and the electrode terminal comprises a first connecting terminal and a second connecting terminal, the first connecting terminal is arranged on the cover plate and the first insulating part in a penetrating manner, and the second connecting terminal is arranged on the cover plate and the second insulating part in a penetrating manner. In the embodiment of the invention, the first insulating part is provided with the first lap joint part, and the second insulating part is provided with the second lap joint part, so that the first insulating part and the second insulating part are mutually limited through the lap joint of the first lap joint part and the second insulating part and the lap joint of the second lap joint part and the first insulating part; therefore, the situation that a large gap is formed between the insulating part and the cover plate is reduced or even avoided.

Description

TECHNICAL FIELD

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

[0002] A secondary battery, also known as a rechargeable battery or a storage battery, is a battery that can be activated by charging after discharging to continue to be used. The recyclable nature of the secondary battery makes it gradually become the main power source of electric equipment. As the demand for secondary batteries gradually increases, people's requirements for its performance in all aspects are also getting higher and higher, especially for the use reliability.

[0003] In related technologies, a secondary battery is usually composed of a cover assembly, an electrode assembly and a shell. In the actual production process, the cover assembly, the electrode assembly and the shell are made respectively. Then, in the assembly process, the cover assembly and the electrode assembly are welded first, the welded electrode assembly is then put into the shell, and the opening of the shell is sealed by welding after the cover assembly is used to cover the opening, so as to form the basic structure of the secondary battery.

[0004] Among them, the cover assembly includes a cover plate and an insulating piece, and an electrode terminal penetrating the cover plate and the insulating piece. Before the electrode assembly enters the shell, a protective film is usually used to wrap the electrode assembly and is fixed with the insulating piece by heat melting, so as to protect the electrode assembly and protect the connection between the electrode assembly and the electrode terminal. However, in related technologies, when fixing the protective film and the insulating piece, the deformation of the insulating piece affects the fixing yield of the protective film, thereby reducing the assembly yield of the secondary battery. Utility model content

[0005] One of the main purposes of the present application is to provide a cover assembly, an energy storage device and an electric equipment capable of improving the assembly yield.

[0006] To achieve the above application purposes, the present application adopts the following technical solutions:

[0007] According to one aspect of the present application, a cover assembly is provided, comprising: a cover plate; an insulating piece located on one side of the cover plate and comprising a first insulating part and a second insulating part, the opposite abutting edges of the first insulating part and the second insulating part respectively have protruding first and second lap parts, and the first insulating part and the second lap part are lapped, and the second insulating part and the first lap part are lapped; an electrode terminal comprising a first connecting terminal and a second connecting terminal, the first connecting terminal penetrating the cover plate and the first insulating part, and the second connecting terminal penetrating the cover plate and the second insulating part.

[0008] In the embodiment of the present application, the first insulation part and the second insulation part are positioned on the cover plate by the first connecting terminal and the second connecting terminal respectively, and the abutting edge of the first insulation part (i.e. the edge facing the second insulation part) is provided with a first lap joint part, and the abutting edge of the second insulation part (i.e. the edge facing the first insulation part) is provided with a second lap joint part, so that the first insulation part and the second insulation part are positioned in the thickness direction of the cover plate (i.e. the height direction of the energy storage device) by the lap joint of the first lap joint part and the abutting edge of the second insulation part, and the lap joint of the second lap joint part and the abutting edge of the first insulation part, thereby reducing or even avoiding the formation of a large gap between the insulation part and the cover plate.

[0009] According to an embodiment of the present application, the abutting edges of the first insulation part and the second insulation part are in the shape of a circular arc.

[0010] In the embodiment of the present application, the abutting edges in the shape of a circular arc facilitate increasing the effective length of the abutting edges, so that a larger number of first lap joint parts and second lap joint parts can be provided to improve the stability of the first insulation part and the second insulation part after being lapped together; at the same time, the alignment effect of the first insulation part and the second insulation part can be improved when they are lapped together, thereby improving the assembly efficiency of the insulation part.

[0011] According to an embodiment of the present application, the first lap joint part is lapped on the side of the second lap joint part close to the cover plate, and the second lap joint part is lapped on the side of the first lap joint part close to the cover plate.

[0012] According to an embodiment of the present application, the cover plate is provided with an explosion-proof hole, and the first insulation part and the second insulation part are both provided with a plurality of gas permeable holes.

[0013] In the embodiment of the present application, the plurality of gas permeable holes facilitate the gas in the accommodating cavity to gather at the explosion-proof hole, thereby facilitating the accurate opening of the explosion-proof valve when the gas pressure is too large, and reducing the material usage of the insulation part to achieve lightweight design, and also reducing the material usage of the insulation part, thereby reducing or even avoiding the situation that the insulation part melts and blocks the explosion-proof valve when the energy storage device is in thermal runaway.

[0014] According to an embodiment of the present application, the connection between the first lap joint part and the first insulation part, and the connection between the second lap joint part and the second insulation part are both designed with a circular arc transition.

[0015] According to an embodiment of the present application, the abutting edge of the first insulation part and / or the second insulation part has a protrusion facing away from the cover plate.

[0016] In the embodiment of the present application, when the electrode assembly is wrapped with the protective film, the end cover assembly and the electrode assembly are placed upside down, at this time the electrode assembly is supported on the protrusion, so that the flatness of the first and second insulating parts after lapping is ensured by pressing the protrusion, and the accuracy of the edge alignment of the protective film and the edge of the insulating part is ensured.

[0017] According to an embodiment of the present application, the protrusion has a through hole penetrating along the distribution direction of the first and second insulating parts.

[0018] In the embodiment of the present application, the through hole is provided to facilitate reducing the blockage of the protrusion when the gas in the accommodating cavity is discharged, thereby improving the smoothness of the exhaust.

[0019] According to an embodiment of the present application, the protrusion is an arc-shaped structure.

[0020] In the embodiment of the present application, for the protrusion in the arc-shaped structure, when the electrode assembly is pressed, the protrusion is deformed to achieve buffering, reduce the hard impact on the electrode assembly, and prolong the service life of the electrode assembly.

[0021] According to an embodiment of the present application, the abutting edge of the first insulating part has the protrusion, and the protrusion is located on the side of the first lapping part away from the second insulating part.

[0022] In the embodiment of the present application, when the protrusion on the first insulating part is located on the side of the first lapping part away from the second lapping part, the distance between the protrusion and the first lapping part is shortened, so that the inverted electrode assembly can directly press the first insulating part through the protrusion when the protective film and the insulating part are welded, and the positioning effect of the first and second insulating parts after lapping is improved, and the edge alignment effect of the protective film and the edge of the insulating part is improved.

[0023] According to an embodiment of the present application, the abutting edges of the first and second insulating parts have the protrusions, and the protrusions are distributed in a staggered manner in the extension direction of the abutting edges.

[0024] According to an aspect of the present application, a kind of energy storage devices are provided, comprising: shell, including the accommodating cavity with opening;Electrode assembly, is housed in the accommodating cavity, and with first tab and second tab;Protective film, the protective film wraps the electrode assembly;The end cover assembly of the above-mentioned aspect, the end cover assembly seals the opening of the accommodating cavity, and the first connecting terminal and the second connecting terminal are respectively electrically connected with the first tab and the second tab of the electrode assembly, and the protective film is fixedly connected with the insulating part.

[0025] According to an aspect of the present application, there is provided an electrical device, comprising the energy storage device according to any one of the preceding aspects, wherein the energy storage device supplies power to the electrical device.

[0026] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[0028] Figure 1 is a schematic diagram of an energy storage system according to an exemplary embodiment.

[0029] Figure 2 is an axial side exploded structural schematic diagram of an energy storage device according to an exemplary embodiment.

[0030] Figure 3 is an axial side bottom exploded structural schematic diagram of an end cap assembly according to an exemplary embodiment.

[0031] Figure 4 is a partial enlarged structural schematic diagram of the end cap assembly shown in Figure 3

[0032] Figure 5 is an axial side bottom structural schematic diagram of an insulating member according to an exemplary embodiment.

[0033] Figure 6 is a partial enlarged structural schematic diagram of the insulating member shown in Figure 5

[0034] Figure 7 is an axial side bottom exploded structural schematic diagram of another end cap assembly according to an exemplary embodiment.

[0035] Figure 8 is a partial enlarged structural schematic diagram of the end cap assembly shown in Figure 7

[0036] Figure 9 is an axial side bottom exploded structural schematic diagram of yet another end cap assembly according to an exemplary embodiment.

[0037] Figure 10 is a partial enlarged structural schematic diagram of the end cap assembly shown in Figure 9

[0038] Figure 11 is a structural schematic diagram of an electrical device according to an exemplary embodiment. ​​​​

[0039] Wherein, the reference signs are explained as follows:

[0040] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electric equipment;

[0041] 10, housing; 20, electrode assembly; 30, protective film; 40, end cap assembly;

[0042] 11, accommodating cavity;

[0043] 21, first tab; 22, second tab;

[0044] 41, cover plate; 42, insulating piece; 43, electrode terminal; 44, explosion-proof valve;

[0045] 411, explosion-proof hole;

[0046] 421, first insulating portion; 422, second insulating portion; 423, first lapping portion; 424, second lapping portion; 425, protrusion; 426, air hole; 427, through hole;

[0047] 431, first connecting terminal; 432, second connecting terminal. DETAILED DESCRIPTION

[0048] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will be simplified or omitted.

[0049] Since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate, it is necessary to store one energy form into the same energy form or convert into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0050] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption, and too much electricity at low electricity consumption), and the unstable voltage will cause damage to electricity, therefore, it may cause the problem of "abandoning wind and light" due to insufficient electricity demand or insufficient grid accommodation capacity.

[0051] And to solve the problem of insufficient power demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is converted into other forms of energy through physical or chemical means for storage, and when needed, the energy stored in the energy storage device is converted into electrical energy and released. Simply put, the energy storage device is similar to a large "power bank". When the light energy and wind energy are sufficient, the electrical energy is stored, and when needed, the stored electrical energy is released.

[0052] Current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0053] (1) Large energy storage containers applied in grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the grid, realize load matching of electrical energy in time and space, enhance renewable energy consumption capacity, and are of great significance in terms of grid system backup, relieving peak load power supply pressure and peak regulation;

[0054] (2) Small and medium-sized energy storage cabinets applied in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes applied in household energy storage scenarios on the user side, the main operation mode is "peak clipping and valley filling". Because there is a big price difference in electricity bills according to the power demand at peak and valley positions, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; During the peak period, the electricity in the energy storage device is released for use to achieve the purpose of saving electricity bills. In addition, in remote areas, as well as areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to the user providing a backup power source for himself and the grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0055] The present application provides an energy storage system, which comprises an energy storage device to realize the storage or supply of electrical energy through the energy storage device.

[0056] Taking the household energy storage scenario in user side energy storage as an example, Figure 1A schematic diagram of an energy storage system provided by the present application is shown, which includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, a household appliance, etc.), the electric energy conversion device 200 is electrically connected with the energy storage device 100, and the energy storage device 100 is electrically connected with the user load 300. The energy storage device 100 is a small energy storage box, which can be installed on an outdoor wall by a wall-mounted manner. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy, and store the electric energy through the energy storage device 100, and then supply the user load 300 for use at a high electricity price peak time or when the power grid is powered off.

[0057] The energy storage device 100 can be, but is not limited to, a single battery (secondary battery), and a battery module, a battery pack, a battery system, etc. composed of single batteries. The battery single can be a lithium ion battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and the battery single can be in a cylindrical shape, a flat shape, a cuboid shape, etc., which is not limited by the present application. Specifically, the battery single can realize the charging and discharging process by using the chemical reaction or change of the energy storage medium (chemical element). In short, the electric energy generated by light energy and wind energy is stored in the battery single through the chemical reaction or change of the energy storage medium, and the electric energy stored in the battery single is released for use at a high external electric energy use peak time or after being transferred.

[0058] In some embodiments, as shown in Figure 2 The energy storage device 100 includes a shell 10, an electrode assembly 20, a protective film 30 (such as a blue film), and an end cover assembly 40. The shell 10 includes a containing cavity 11 with an opening, the electrode assembly 20 is contained in the containing cavity 11, the protective film 30 wraps the electrode assembly 20, and the end cover assembly 40 seals the opening of the containing cavity 11.

[0059] The shell 10 can be a cylindrical structure with one end opening, and the energy storage device 100 includes an end cover assembly 40 to seal one opening of the shell 10. Of course, the shell 10 can also be a cylindrical structure with two ends opening, and the energy storage device 100 includes an end cover assembly 40 and a cover plate 41 to seal two openings of the shell 10, respectively.

[0060] The electrode assembly 20 includes a plurality of electrode groups 21, and each electrode group 21 includes a plurality of electrode units 22, and each electrode unit 22 includes a positive electrode 221, a negative electrode 222, and a separator 223. Figure 2 The positive electrode 221 includes a positive electrode current collector 2211 and a positive electrode active material layer 2212, and the negative electrode 222 includes a negative electrode current collector 2221 and a negative electrode active material layer 2222. Figure 3As shown, the end cover assembly 40 includes a cover plate 41, an insulating piece 42 located on the side of the cover plate 41 facing the electrode assembly 20, and electrode terminals 43 passing through the cover plate 41 and the insulating piece 42 and connected with the tabs of the electrode assembly 20 to serve as the power connection end of the energy storage device 100. The protective film 30 is fixedly connected (e.g., hot melt fixed) with the insulating piece 42. In addition, the cover plate 41 can be provided with an explosion-proof hole 411, and an explosion-proof valve 44 can be installed in the explosion-proof hole 411 to be opened and release the gas in the containing cavity 11 when the pressure in the containing cavity 11 is greater than the opening pressure of the explosion-proof valve 44, thereby improving the safety of the energy storage device 100. In addition, the cover plate 41 can be provided with a liquid injection hole and a sealing plug sealing the liquid injection hole, and the liquid injection hole is used to inject liquid to soak the electrode assembly 20 after the energy storage device 100 is assembled, and then the liquid injection hole is sealed with the sealing plug to ensure the normal use of the energy storage device 100.

[0061] The electrode assembly 20 includes a positive electrode sheet, a negative electrode sheet and a separator stacked and arranged, and the separator is located between the positive electrode sheet and the negative electrode sheet. The electrode assembly 20 has a first tab 21 (e.g., a positive tab) and a second tab 22 (e.g., a negative tab) at the end or side wall in the axial direction. For example, the first tab 21 and the second tab 22 are located at different side walls of the electrode assembly 20, as shown in Figure 2 and Figure 3 The electrode terminals 43 on the end cover assembly 40 include a first connection terminal 431 and a second connection terminal 432, and the first connection terminal 431 and the second connection terminal 432 are respectively electrically connected with the first tab 21 and the second tab 22 on the electrode assembly 20 to realize the output of the electrical energy on the electrode assembly 20 through the first connection terminal 431 and the second connection terminal 432.

[0062] It should be noted that the first connection terminal 431 and the second connection terminal 432 can be directly electrically connected with the first tab 21 and the second tab 22, or indirectly electrically connected, i.e., the energy storage device 100 further includes a metal adapter to realize the indirect electrical connection between the first tab 21 and the second tab 22 of the electrode assembly 20 and the first connection terminal 431 and the second connection terminal 432 on the end cover assembly 40, thereby ensuring the overcurrent capacity between the electrode terminals 43 and the electrode assembly 20.

[0063] In the prior art, the structure size of the insulating member 42 included in the end cover assembly 40 is relatively large, and the insulating member 42 is prone to bending deformation at the middle position under the influence of its own gravity, so that a relatively large gap is formed between the insulating member 42 and the cover plate 41. Especially for the energy storage device 100 with large capacity, the size of the energy storage device 100 is large, and at this time, the size of the insulating member 42 in the width direction W of the energy storage device 100 is also large, so that the insulating member 42 is more prone to form a relatively large gap with the cover plate 41. Therefore, when the end cover assembly 40 is connected with the electrode assembly 20, and the protective film 30 is wrapped on the electrode assembly 20, the edge of the protective film 30 is misaligned with the edge of the insulating member 42, so that the protective film 30 is prone to be fixed poorly, thereby reducing the assembly yield of the energy storage device 100.

[0064] The end cover assembly 40 provided by the embodiments of the present application includes an insulating member 42 composed of a first insulating part 421 and a second insulating part 422 which are lapped with each other, so that the first insulating part 421 and the second insulating part 422 are limited by each other, thereby reducing or even avoiding the situation that a relatively large gap is formed between the insulating member 42 and the cover plate 41 due to deformation. Therefore, when the end cover assembly 40 is applied to the energy storage device 100, the accuracy of the alignment between the edge of the protective film 30 and the edge of the insulating member 42 can be ensured, so that the stability of the fixation of the protective film 30 can be ensured, thereby improving the assembly yield of the energy storage device 100.

[0065] In some embodiments, as shown in Figure 3 and Figure 4 The end cover assembly 40 includes a cover plate 41, an insulating member 42 and an electrode terminal 43. The insulating member 42 is located on one side of the cover plate 41 and includes a first insulating part 421 and a second insulating part 422. The opposite abutting edges of the first insulating part 421 and the second insulating part 422 respectively have a first lapping part 423 and a second lapping part 424 which protrude, and the first insulating part 421 is lapped with the second lapping part 424, and the second insulating part 422 is lapped with the first lapping part 423. The electrode terminal 43 includes a first connecting terminal 431 and a second connecting terminal 432. The first connecting terminal 431 is arranged through the cover plate 41 and the first insulating part 421, and the second connecting terminal 432 is arranged through the cover plate 41 and the second insulating part 422.

[0066] In the embodiment, the first connecting terminal 431 and the second connecting terminal 432 are arranged to limit the first insulating part 421 and the second connecting part on the cover plate 41 respectively, and the abutting edge of the first insulating part 421 (i.e. the edge facing the second insulating part 422) is provided with the first lap part 423, and the abutting edge of the second insulating part 422 (i.e. the edge facing the first insulating part 421) is provided with the second lap part 424, so that the first lap part 423 and the abutting edge of the second insulating part 422 are lapped, and the second lap part 424 and the abutting edge of the first insulating part 421 are lapped, to limit the first insulating part 421 and the second insulating part 422 in the thickness direction of the cover plate 41 (i.e. the height direction H of the energy storage device 100), so as to reduce or even avoid the formation of a large gap between the insulating part 42 and the cover plate 41.

[0067] In the embodiment, the first connecting terminal 431 and the second connecting terminal 432 are arranged to limit the first insulating part 421 and the second connecting part on the cover plate 41 respectively, and the abutting edge of the first insulating part 421 (i.e. the edge facing the second insulating part 422) is provided with the first lap part 423, and the abutting edge of the second insulating part 422 (i.e. the edge facing the first insulating part 421) is provided with the second lap part 424, so that the first lap part 423 and the abutting edge of the second insulating part 422 are lapped, and the second lap part 424 and the abutting edge of the first insulating part 421 are lapped, to limit the first insulating part 421 and the second insulating part 422 in the thickness direction of the cover plate 41 (i.e. the height direction H of the energy storage device 100), so as to reduce or even avoid the formation of a large gap between the insulating part 42 and the cover plate 41.

[0068] For example, the abutting edge of the first insulating part 421 has one first lap part 423, and the abutting edge of the second insulating part 422 has one second lap part 424. At this time, for the lapping of the first lap part 423 and the second insulating part 422, and the lapping of the second lap part 424 and the first insulating part 421, the first lap part 423 can be located on the side of the second insulating part 422 close to the cover plate 41, and the second lap part 424 can be located on the side of the first insulating part 421 close to the cover plate 41; or the first lap part 423 can be located on the side of the second insulating part 422 away from the cover plate 41, and the second lap part 424 can be located on the side of the first insulating part 421 away from the cover plate 41.

[0069] For example, as shown in FIG. 6, the abutting edge of the first insulating part 421 has one first lap part 423, and the abutting edge of the second insulating part 422 has one second lap part 424. Figure 4As shown, the abutting edge of the first insulating part 421 has a plurality of first lap joints 423, and the sizes of the plurality of first lap joints 423 in the extension direction of the abutting edge are not all the same; the abutting edge of the second insulating part 422 has a plurality of second lap joints 424, and the sizes of the plurality of second lap joints 424 in the extension direction of the abutting edge are not all the same. At this time, for the lap joint of the plurality of first lap joints 423 and the second insulating part 422, and the lap joint of the plurality of second lap joints 424 and the first insulating part 421, it can be that the plurality of first lap joints 423 are all located on the side of the second insulating part 422 close to the cover plate 41, and the plurality of second lap joints 424 are all located on the side of the first insulating part 421 close to the cover plate 41; it can also be that, as shown in the two examples above, the plurality of first lap joints 423 are all located on the side of the second insulating part 422 away from the cover plate 41, and the plurality of second lap joints 424 are all located on the side of the first insulating part 421 away from the cover plate 41; it can also be that the plurality of first lap joints 423 are distributed on both sides of the second insulating part 422 away from the cover plate 41, and the plurality of second lap joints 424 are distributed on both sides of the first insulating part 421. Of course, it can also be that the plurality of first lap joints 423 are all located on the side of the second insulating part 422 close to the cover plate 41, and the plurality of second lap joints 424 are distributed on both sides of the first insulating part 421, and the like, which are not limited in the embodiments of the present application. Figure 4 As shown, the plurality of first lap joints 423 are all located on the side of the second insulating part 422 away from the cover plate 41, and the plurality of second lap joints 424 are all located on the side of the first insulating part 421 away from the cover plate 41; it can also be that the plurality of first lap joints 423 are distributed on both sides of the second insulating part 422 away from the cover plate 41, and the plurality of second lap joints 424 are distributed on both sides of the first insulating part 421. Of course, it can also be that the plurality of first lap joints 423 are all located on the side of the second insulating part 422 close to the cover plate 41, and the plurality of second lap joints 424 are distributed on both sides of the first insulating part 421, and the like, which are not limited in the embodiments of the present application.

[0070] It should be noted that, for the two examples above, when the first lap joint 423 is located on the side of the second insulating part 422 away from the cover plate 41, and the second lap joint 424 is located on the side of the first insulating part 421 away from the cover plate 41, it is convenient to reduce the overall gap between the insulating part 42 and the cover plate 41, thereby facilitating the thin design of the end cover assembly 40 and reducing the space occupied in the accommodating cavity 11 of the shell 10.

[0071] Among them, the abutting edges of the first insulating part 421 and the second insulating part 422 are linear, at this time the extension direction of the abutting edges of the first insulating part 421 and the second insulating part 422 is the thickness direction S of the energy storage device 100, so as to simplify the structure of the first insulating part 421 and the second insulating part 422, and to simplify the processing and manufacturing of the first insulating part 421 and the second insulating part 422.

[0072] Alternatively, the abutting edges of the first and second insulation portions 421 and 422 are in a circular arc shape, and the openings of the circular arc shape after the first and second insulation portions 421 and 422 are overlapped are in the same direction, at which time the extension direction of the abutting edges on the first and second insulation portions 421 and 422 is the circumferential direction of the circular arc, so as to facilitate increasing the effective length of the abutting edges, thereby being able to set a larger number of first and second overlapping portions 423 and 424 to improve the stability after the first and second insulation portions 421 and 422 are overlapped. At the same time, when the first and second insulation portions 421 and 422 are overlapped, the alignment of the first and second insulation portions 421 and 422 is facilitated, thereby improving the assembly efficiency of the insulation piece 42.

[0073] Of course, the abutting edges of the first and second insulation portions 421 and 422 can be in a zigzag shape or a wave shape, etc. in addition to the straight line shape or the circular arc shape described above, and the present application does not limit this.

[0074] In some embodiments, as shown in Figure 3 The cover plate 41 is provided with an explosion-proof hole 411, and the second insulation portion 422 has a gas permeable hole 426 opposite to the explosion-proof hole 411. As such, the gas permeable hole 426 is opposite to the explosion-proof valve 44 installed on the explosion-proof hole 411, so that when the end cover assembly 40 is applied to the energy storage device 100, the gas in the accommodating cavity 11 of the housing 10 is sequentially discharged along the gas permeable hole 426 and the explosion-proof valve 44 when the explosion-proof valve 44 is opened.

[0075] When the first and second insulation portions 421 and 422 are limited on one side of the cover plate 41, there will inevitably be a gap between the first insulation portion 421 and the cover plate 41, and between the second insulation portion 422 and the cover plate 41. At this time, as shown in Figure 3 The first and second insulation portions 421 and 422 each have a plurality of gas permeable holes 426.

[0076] In this way, by providing a plurality of gas permeable holes 426, the gas in the accommodating cavity 11 is facilitated to gather at the explosion-proof hole 411, thereby facilitating the accurate opening of the explosion-proof valve 44 when the gas pressure is too large, and reducing the material of the insulation piece 42 to achieve lightweight design. In addition, due to the reduction of the material of the insulation piece 42, when the energy storage device 100 is in thermal runaway, the insulation piece 42 is reduced or even avoided from blocking the explosion-proof valve 44 due to melting.

[0077] Optionally, as shown in Figure 5 and Figure 6As shown, the connection between the first lap joint 423 and the first insulating part 421, and the connection between the second lap joint 424 and the second insulating part 422 are both designed as a circular arc transition. In this way, the flow resistance of the gas in the accommodating cavity 11 at the connection can be reduced, thereby improving the smoothness of the gas flow, while avoiding the occurrence of stress concentration between the first lap joint 423 and the first insulating part 421, and between the second lap joint 424 and the second insulating part 422.

[0078] In some embodiments, the abutting edge of the first insulating part 421 and / or the second insulating part 422 has a protrusion 425 facing away from the cover plate 41.

[0079] In some embodiments, the abutting edge of the first insulating part 421 and / or the second insulating part 422 has a protrusion 425 facing away from the cover plate 41.

[0080] For example, the abutting edge of the first insulating part 421 has a protrusion 425, or as shown in Figure 7 and Figure 8 For example, the abutting edge of the first insulating part 421 has a protrusion 425, or as shown in

[0081] For example, the abutting edge of the first insulating part 421 has a protrusion 425, or as shown in Figure 7 and Figure 8 For example, the abutting edge of the first insulating part 421 has a protrusion 425, or as shown in Figure 9 and Figure 10 For example, the abutting edge of the first insulating part 421 has a protrusion 425, or as shown in Figure 7 and Figure 8As shown, the second lap portion 424 and the protrusions 425 on the abutting edge of the second insulating portion 422 are distributed along the extension direction of the abutting edge (i.e. the thickness direction S of the energy storage device 100) with a distance.

[0082] When the protrusions 425 on the first insulating portion 421 are located on the side of the first lap portion 423 away from the second insulating portion 422, it is convenient to reduce the distance between the protrusions 425 and the first lap portion 423, so as to facilitate the limiting effect of the first insulating portion 421 on the second insulating portion 422 after the lap, and further improve the alignment effect of the edge of the protective film 30 and the edge of the insulating member 42.

[0083] It should be noted that for the protrusions 425 provided on the first insulating portion 421, in addition to the above-mentioned positions, the abutting edge of the second insulating portion 422 can be located between the first lap portion 423 and the cover plate 41, and at this time, the protrusions 425 on the first insulating portion 421 are arranged on the side of the first lap portion 423 away from the cover plate 41. In this way, when welding the protective film 30 and the insulating member 42 of the energy storage device 100, the inverted electrode assembly 20 can directly press the first lap portion 423 through the protrusions 425, so as to effectively ensure the limiting of the first lap portion 423 on the second insulating portion 422. Correspondingly, for the protrusions 425 provided on the second insulating portion 422, in addition to the above-mentioned positions, the abutting edge of the first insulating portion 421 can be located between the second lap portion 424 and the cover plate 41, and at this time, the protrusions 425 on the second insulating portion 422 are arranged on the side of the second lap portion 424 away from the cover plate 41. In this way, when welding the protective film 30 and the insulating member 42 of the energy storage device 100, the inverted electrode assembly 20 can directly press the second lap portion 424 through the protrusions 425, so as to effectively ensure the limiting of the second lap portion 424 on the first insulating portion 421.

[0084] For example, as shown in FIG. 1 and FIG. 2, the protrusions 425 on the abutting edge of the first insulating portion 421 and the protrusions 425 on the abutting edge of the second insulating portion 422 are arranged in the distribution direction of the first insulating portion 421 and the second insulating portion 422, i.e. the protrusions 425 on the abutting edge of the first insulating portion 421 and the protrusions 425 on the abutting edge of the second insulating portion 422 are arranged along the width direction W of the energy storage device 100. Figure 7 Figure 8 As shown, the protrusions 425 on the abutting edge of the first insulating portion 421 and the protrusions 425 on the abutting edge of the second insulating portion 422 are arranged in the distribution direction of the first insulating portion 421 and the second insulating portion 422, i.e. the protrusions 425 on the abutting edge of the first insulating portion 421 and the protrusions 425 on the abutting edge of the second insulating portion 422 are arranged along the width direction W of the energy storage device 100. Figure 9 Figure 10 ​​As shown, the plurality of protrusions 425 are distributed in a staggered manner in the extension direction of the abutting edge (shown in the thickness direction S of the energy storage device 100 in the figure), that is, the protrusions 425 of the abutting edge on the first insulating portion 421 are distributed in a staggered manner in the thickness direction S of the energy storage device 100 with the protrusions 425 of the abutting edge on the second insulating portion 422, and the present application does not limit this.

[0085] In some embodiments, as shown in Figure 8 or Figure 10 The protrusions 425 have through holes 427 extending along the distribution direction of the first insulating portion 421 and the second insulating portion 422 (the width direction W of the energy storage device 100). In this way, the protrusions 425 can facilitate reducing the obstruction to the exhaust of gas in the accommodation cavity 11, thereby improving the smoothness of exhaust.

[0086] The protrusions 425 can be an arch-shaped structure, or a straight U-shaped structure as shown in Figure 8 or Figure 10 When the protrusions 425 are in an arch-shaped structure, the mutual extrusion between the protrusions 425 and the electrode assembly 20 can facilitate buffering through the extrusion deformation of the protrusions 425, reducing the hard impact on the electrode assembly 20, and prolonging the service life of the electrode assembly 20.

[0087] In some embodiments, the edges and corners of the protrusions 425 are chamfered, which can be straight chamfering or arc chamfering, etc. In this way, the chamfering of the edges and corners of the protrusions 425 can facilitate reducing the obstruction to the exhaust of gas in the accommodation cavity 11, thereby improving the smoothness of exhaust.

[0088] The present application also provides a power utilization device 400, which can be a user energy storage cabinet, an energy storage container, etc. As shown in Figure 11 The power utilization device 400 includes the energy storage device 100 described in the above embodiments, and the energy storage device 100 supplies power to the power utilization device 400. In combination with the above description, the power utilization device 400 of the present application can improve the reliability of the power utilization device 400 based on the yield of the energy storage device 100 during use.

[0089] In the present application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise specified. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0090] In the description of the present application embodiments, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application embodiments.

[0091] In the description of the present application embodiments, the description of the terms "one embodiment", "some embodiments", "a specific embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description 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.

[0092] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An end cap assembly, characterized by, The application relates to a battery cover plate, which comprises the following parts: a cover plate (41); an insulating part (42) located on one side of the cover plate (41) and comprising a first insulating part (421) and a second insulating part (422), the abutting edges of the first insulating part (421) and the second insulating part (422) are respectively provided with a first overlapping part (423) and a second overlapping part (424), and the first insulating part (421) is overlapped with the second overlapping part (424), and the second insulating part (422) is overlapped with the first overlapping part (423); an electrode terminal (43) comprising a first connecting terminal (431) and a second connecting terminal (432), the first connecting terminal (431) is arranged on the cover plate (41) and the first insulating part (421), and the second connecting terminal (432) is arranged on the cover plate (41) and the second insulating part (422).

2. The end cap assembly of claim 1, wherein, The abutting edges of the first insulating part (421) and the second insulating part (422) are in the shape of a circular arc.

3. The end cap assembly of claim 1, wherein, The first insulating part (421) is overlapped on one side of the second overlapping part (424) close to the cover plate (41), and the second insulating part (422) is overlapped on one side of the first overlapping part (423) close to the cover plate (41).

4. The end cap assembly of claim 1, wherein, An explosion-proof hole (411) is arranged on the cover plate (41), and a plurality of air-permeable holes (426) are arranged on the first insulating part (421) and the second insulating part (422).

5. The end cap assembly of claim 4, wherein, The connecting positions of the first overlapping part (423) and the first insulating part (421) and the connecting positions of the second overlapping part (424) and the second insulating part (422) are designed in the shape of a circular arc.

6. An end cap assembly as claimed in any one of claims 1 to 5, wherein, The abutting edges of the first insulating part (421) and / or the second insulating part (422) are provided with a protrusion (425) facing away from the cover plate (41).

7. The end cap assembly of claim 6, wherein, The protrusion (425) is provided with a through hole (427) penetrating along the distribution direction of the first insulating part (421) and the second insulating part (422).

8. The end cap assembly of claim 7, wherein, The protrusion (425) is in the shape of an arch.

9. The end cap assembly of claim 6, wherein, The abutting edge of the first insulating part (421) is provided with the protrusion (425), and the protrusion (425) is located on one side of the first overlapping part (423) away from the second insulating part (422).

10. The end cap assembly of claim 6, wherein, The abutting edges of the first insulating part (421) and the second insulating part (422) are provided with the protrusion (425), and a plurality of protrusions (425) are distributed in a staggered mode along the extension direction of the abutting edges.

11. An energy storage device, characterized by, The application relates to a battery cover plate, which comprises the following parts: a shell (10) comprising a containing cavity (11) with an opening; an electrode assembly (20) accommodated in the containing cavity (11) and comprising a first tab (21) and a second tab (22); a protective film (30) wrapping the electrode assembly (20); The end cover assembly (40) according to any one of claims 1-10, wherein the end cover assembly (40) seals an opening of the accommodating cavity (11), the first connecting terminal (431) and the second connecting terminal (432) are electrically connected with the first tab (21) and the second tab (22) of the electrode assembly (20) respectively, and the protective film (30) is fixedly connected with the insulating member (42).

12. An electrical device, characterized by The electric device (400) comprises the energy storage device (100) according to the above claim 11, and the energy storage device (100) supplies power for the electric device (400).

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