Battery cell, battery device, energy storage device, energy storage system and charging network

Abstract

The utility model relates to a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and an insulating part, and the shell is internally provided with an accommodating space; the electrode assembly is arranged in the accommodating space; the insulating part is arranged between the inner wall of the shell and the electrode assembly in the preset direction, a boss is arranged on the surface, facing the electrode assembly, of the insulating part, and the boss comprises a first surface close to the electrode assembly and a second surface connected between the first surface and the surface, facing the electrode assembly, of the insulating part; the distance between the second surface and the electrode assembly is reduced in the direction close to the first surface, and the second surface is used for guiding at least part of gas generated by the electrode assembly. According to the battery monomer, the battery device, the energy storage device, the energy storage system and the charging network provided by the invention, the reliability of the battery monomer is improved, and the risk of detonation caused by the fact that pressure cannot be discharged during thermal runaway is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0002] In some cases, the battery monomer includes a shell, an end cover, an electrode assembly and an insulating piece. The end cover covers the shell, the electrode assembly and the insulating piece are arranged in a space enclosed by the shell and the end cover, and the insulating piece is arranged between the end cover and the electrode assembly to insulate and separate the end cover and the electrode assembly.

[0003] However, in the case of thermal runaway of the battery monomer, the insulating piece may soften and fail under the impact of high-temperature and high-pressure gas. If the electrode assembly moves towards the end cover under the pressure at this time, it is easy to block the exhaust passage and hinder the gas from being discharged, thereby increasing the risk of explosion of the battery monomer. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network, which can improve the reliability of the battery monomer and reduce the risk of explosion due to the inability to discharge under pressure when thermal runaway occurs.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, which includes a shell, an electrode assembly and an insulating piece, wherein the shell has an accommodation space inside; the electrode assembly is arranged in the accommodation space; the insulating piece is arranged between the inner wall of the shell and the electrode assembly along a preset direction, the surface of the insulating piece facing the electrode assembly is provided with a boss, the boss includes a first surface close to the electrode assembly and a second surface connected between the first surface and the surface of the insulating piece facing the electrode assembly; the distance between the second surface and the electrode assembly decreases in the direction close to the first surface, and the second surface is used to guide at least part of the gas generated by the electrode assembly.

[0006] In the scheme of the embodiments of the present application, the distance between the second surface and the electrode assembly decreases in the direction close to the first surface, that is, the second surface is an inclined surface inclined to the inside of the insulating piece in the direction of the insulating piece facing the electrode assembly. When the gas generated in the accommodation space flows in the direction parallel to the insulating piece under the blocking action of the insulating piece, it can flow in the direction of the electrode assembly under the guiding action of the second surface after contacting the boss. In this way, the flow direction of the gas in the accommodation space when the battery monomer is in thermal runaway can be changed, the tendency of the electrode assembly to move upward under the pressure can be slowed down or offset, and the risk of the exhaust hole of the insulating piece being blocked by the electrode assembly can be reduced, thereby maintaining the unobstructedness of the exhaust hole when the battery monomer is in thermal runaway and improving the reliability of the battery monomer.

[0007] In some embodiments, the boss further comprises an exhaust hole, one end of the exhaust hole is located on the first surface and / or the second surface, and the other end of the exhaust hole is in communication with the side of the insulating piece away from the electrode assembly. The exhaust hole can be arranged on the first surface and / or the second surface, that is, the arrangement position of the exhaust hole can be selected as needed, which can meet the pressure relief needs of different battery monomers when thermal runaway occurs. At the same time, when the exhaust hole is arranged on the second surface, even if the electrode assembly is in contact with the insulating piece under the action of pressure, it is difficult to completely block the exhaust hole, which further improves the reliability of the battery monomer when thermal runaway occurs.

[0008] In some embodiments, on the second surface, the number of exhaust holes is 2-15. In some embodiments, the flow area of the exhaust hole is 12mm 2 to 150mm 2 . That is, the number and flow area of the exhaust hole can be freely selected according to the size of the battery monomer, so that each size of the battery monomer can obtain good exhaust pressure relief capacity when thermal runaway occurs, thereby improving the reliability and applicability of the battery monomer.

[0009] In some embodiments, the boss comprises a first wall close to the electrode assembly and a second wall connected to the periphery of the first wall, the first wall and the second wall enclosing an exhaust space; the first surface is the surface of the first wall away from the exhaust space, the second surface is the surface of the second wall away from the exhaust space, and the exhaust hole is arranged through the first wall and / or the second wall in the thickness direction. That is, the boss is a non-solid structure, and the boss is a structure formed by bending the insulating piece, which can reduce the material usage of the boss while achieving insulation between the electrode assembly and the shell, thereby reducing the self-weight and improving the mass energy density of the battery monomer.

[0010] In some embodiments, the battery monomer further comprises a support connected to the side of the boss away from the electrode assembly. The arrangement of the support further improves the structural strength of the boss, so that the structure of the boss can remain intact when the battery monomer is in thermal runaway, thereby reducing the risk of softening of the boss under the action of heat and pressure, and further improving the reliability of the battery monomer.

[0011] In some embodiments, the support comprises a main body portion and a support portion, the support portion is arranged on the periphery of the main body portion, the main body portion is connected to the first wall and the support portion is connected to the second wall, and the main body portion and the support portion are provided with a relief hole corresponding to the position of the exhaust hole, and the relief hole is in communication with the exhaust hole. That is, the structure of the support is matched with the structure of the boss, thereby better supporting the boss and improving the structural reliability of the boss, so that the boss can still maintain the integrity of the structure when the battery monomer is in thermal runaway.

[0012] In some embodiments, the second surface includes two first inclined surfaces arranged opposite along a first direction and / or two second inclined surfaces arranged opposite along a second direction, the first inclined surfaces and / or the second inclined surfaces are each arranged obliquely relative to a preset direction, the first direction, the second direction and the preset direction intersect with each other and are not coplanar; the exhaust holes are arranged on the first inclined surfaces and / or the second inclined surfaces. That is, the boss is a rectangular body structure, at this time, the second surface can be four circumferential surfaces connected with the first surface, and exhaust holes can be arranged on each of the four circumferential surfaces, thereby improving the applicability of the arrangement of the exhaust holes to meet the exhaust pressure relief requirements of battery monomers of different specifications and sizes when thermal runaway occurs.

[0013] In some embodiments, the number of bosses is a plurality, and the plurality of bosses are distributed in a first direction intersecting with the preset direction. The arrangement of the plurality of bosses can further improve the insulation performance of the insulating piece at each position, so that the electrode assembly and the shell can maintain a certain distance at different positions, thereby further improving the reliability of the battery monomer; and / or the size of the boss in a second direction intersecting with the preset direction is equal to the size of the insulating piece in the second direction; the first direction intersects with the second direction. Such an arrangement can increase the area of the outer surface of the boss and the volume of the boss itself, thereby effectively improving the guiding effect on the high-pressure and high-temperature gas, and the larger outer surface area of the boss also provides more space for arranging more exhaust holes on the boss, which is conducive to further improving the exhaust pressure relief capacity of the battery monomer when thermal runaway occurs.

[0014] In some embodiments, the minimum distance between the first surface and the insulating piece is 3mm to 10mm. That is, the height dimension of the boss in the preset direction is between 3mm and 10mm, which can also obtain a larger outer surface area of the boss and the volume of the boss itself, thereby being conducive to further improving the exhaust pressure relief capacity of the battery monomer when thermal runaway occurs.

[0015] In some embodiments, the included angle between the second surface and the first surface is between 95° and 150°. Such an arrangement allows the slope of the second surface on the boss to be selected as needed to adapt to battery monomers of more specifications and sizes, thereby having stronger applicability.

[0016] In some embodiments, the insulating piece is further provided with a group of vent holes, the group of vent holes comprising a plurality of vent holes, the vent holes being arranged through the insulating piece along a preset direction; in the preset direction, the group of vent holes is arranged in a staggered manner with the boss. By arranging the group of vent holes in a staggered manner with the boss in the preset direction, when the battery cell is in thermal runaway, the high-temperature and high-pressure gas can also be discharged to the space between the shell and the insulating piece through the group of vent holes, and then discharged to the outside of the containing space by the pressure relief device, which can disperse the concentration of pressure on the insulating piece during the exhaust and pressure relief process, relieve the high temperature and high pressure borne by the insulating piece when the battery cell is in thermal runaway, reduce the risk of structural softening failure of the insulating piece itself when the battery cell is in thermal runaway, and further improve the reliability of the battery cell.

[0017] In some embodiments, the surface of the insulating piece close to the electrode assembly is provided with a groove, and a thickness adjusting platform arranged at the groove bottom; the group of vent holes is arranged in the groove and / or the thickness adjusting platform. In this way, the arrangement positions of different groups of vent holes or the groups of vent holes and the exhaust holes in the preset direction can be distinguished, so that the high-temperature gas located at different positions in the containing space can be discharged through the group of vent holes or the exhaust hole in proximity, further relieving the concentration of pressure at the boss position when the battery cell is in thermal runaway, improving the structural stability of the boss when the battery cell is in thermal runaway, and making the battery cell obtain better reliability.

[0018] In a second aspect, the embodiments of the present application further provide a battery device, which comprises the battery cell provided by any one of the preceding embodiments.

[0019] In a third aspect, the embodiments of the present application further provide an energy storage device, which comprises the battery device provided by any one of the preceding embodiments.

[0020] In a fourth aspect, the embodiments of the present application further provide an energy storage system, which comprises an energy storage converter and the energy storage device provided by any one of the preceding embodiments, the energy storage converter being used to electrically connect a power generation device and the energy storage device.

[0021] In a fifth aspect, the embodiments of the present application further provide a charging network, which comprises a charging pile and the energy storage device provided by any one of the preceding embodiments, the energy storage device being used to provide electric energy for the charging pile.

[0022] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0025] Figure 2 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0026] Figure 3 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application;

[0027] Figure 4 This is a three-dimensional structural schematic diagram of a battery device provided in some embodiments of this application;

[0028] Figure 5 An exploded view of the three-dimensional structure of a single battery cell provided in some embodiments of this application;

[0029] Figure 6 This is a schematic diagram of the mating structure between the insulating component and the boss in a battery cell provided in some embodiments of this application;

[0030] Figure 7 for Figure 6 Enlarged view of part A of the shown battery cell;

[0031] Figure 8 This is a schematic diagram of the mating structure between the insulating component and the boss in a battery cell provided in some embodiments of this application, viewed from a top view.

[0032] Figure 9 for Figure 8 Enlarged view of part B of the shown battery cell;

[0033] Figure 10 This is a schematic diagram of the mating structure between the insulating component and the boss in a battery cell provided in some embodiments of this application, viewed from a side perspective.

[0034] Figure 11 for Figure 10 The cross-sectional view of the battery cell shown along line CC;

[0035] Figure 12 This is a three-dimensional structural diagram of the support member in a battery cell provided in some embodiments of this application.

[0036] Explanation of reference numerals in the attached diagram: 1. Charging network; 2. Energy storage system; 3. Power generation device;

[0037] 2000, Energy storage device; 210, Energy storage enclosure; 3000, Charging pile; 4000, Energy storage converter; 1000, Battery device; 200, Enclosure; 201, First part; 202, Second part;

[0038] 100. Battery cell; 10. Casing; 11. End cap; 12. Housing; 20. Electrode assembly; 30. Insulator; 31. Groove; 32. Thickness adjustment platform; 40. Boss; 41. First wall; 411. First surface; 42. Second wall; 421. Second surface; 4211. First inclined surface; 4212. Second inclined surface; 43. Vent hole; 50. Support member; 51. Main body; 52. Support part; 60. Vent hole group; 61. Vent hole; 101. Accommodation space; 102. Exhaust space; 103. Clearance hole; X. Preset direction; Y. First direction; Z. Second direction. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] In addition, if there is a term "and / or", "and / or" is merely a description of the relationship between the associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in this paper generally represents that the associated objects before and after are an "or" relationship. If these terms "first", "second" appear, these terms are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0043] In this application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" of the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0044] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If there is, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for illustrative purposes, and do not represent the only implementation.

[0045] Compared with other types of batteries such as lead-acid, cadmium-nickel, lithium-ion batteries have the advantages of large specific capacity, high working voltage, fast charging speed, wide working temperature range, long cycle life, small volume, light weight, etc. Not only widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric devices. However, the safety of lithium batteries is an important factor affecting their development.

[0046] The positive electrode material of lithium-ion battery generally has lithium-rich manganese-based, lithium cobaltate, lithium manganate, lithium nickel cobalt manganate, lithium iron phosphate; the negative electrode is generally graphite, silicon-carbon composite material, the charging process is that lithium ions are extracted from the positive electrode material, embedded into the negative electrode material through the electrolyte and the separator, and the lithium-ion battery in the full charge state has strong oxidizing property in the positive electrode and strong reducing property in the negative electrode. The electrolyte used is LiPF6, which is easily decomposed by heat and sensitive to water; the electrolyte solvent is generally an organic solvent of carbonic acid ester, which has low flash point, and under the conditions of overcharge, overdischarge and overheating of the battery, it may cause thermal runaway in the battery, causing combustion and even explosion of the battery.

[0047] In the related art, the battery monomer includes a shell and an electrode assembly arranged in the shell, the shell generally includes an end cover and a shell body, the end cover and the shell body jointly form an accommodation space for accommodating the electrode assembly and the electrolyte. When the electrode assembly is in a normal working state, the pressure relief device arranged on the end cover is in a non-pressure relief state, and when the electrode assembly is in an overheating or thermal runaway state, a large amount of high-temperature gas will be generated in the accommodation space. When the gas in the accommodation space reaches the critical pressure at which the pressure relief device opens, the pressure relief device will open to discharge and release the gas in the accommodation space.

[0048] In the battery monomer of the related art, the insulating member serves as a component arranged between the electrode assembly and the end cover, mainly plays a role of insulating the electrode assembly and the end cover, and generally has an exhaust hole for gas to pass through, so that when the battery monomer is in thermal runaway and the pressure relief device is in a pressure relief state, the high-temperature gas in the accommodation space will pass through the exhaust hole on the insulating member and the pressure relief device under the action of pressure and be discharged to the outside of the accommodation space.

[0049] However, when the battery monomer is in thermal runaway, the electrode assembly has the risk of moving upward (moving towards the insulating member) under the action of the high-pressure gas in the accommodation space, thereby plugging the exhaust hole opened in the insulating member, so that the gas in the accommodation space cannot be continuously discharged, thereby increasing the risk of explosion or even explosion of the battery monomer in thermal runaway.

[0050] Based on such a status quo, the battery monomer provided by the embodiments of the present application comprises a shell, an electrode assembly and an insulating piece, wherein the shell has a containing space inside; the electrode assembly is arranged in the containing space; the insulating piece is arranged between the inner wall of the shell and the electrode assembly along a preset direction, the surface of the insulating piece facing the electrode assembly is provided with a boss, the boss comprises a first surface close to the electrode assembly and a second surface connected between the first surface and the surface of the insulating piece facing the electrode assembly; at least part of the second surface is inclined relative to the preset direction, and the end close to the first surface is more inclined to the central position of the boss relative to the end close to the insulating piece.

[0051] According to the battery monomer of the present application, by arranging at least part of the second surface to be inclined relative to the preset direction, and the end close to the first surface to be more inclined to the central position of the boss relative to the end close to the insulating piece, i.e. the second surface is an inclined surface inclined inward along the direction of the surface of the insulating piece facing the electrode assembly, when the gas generated in the containing space moves in the direction parallel to the insulating piece under the blocking effect of the insulating piece, it can move in the direction towards the electrode assembly under the guiding effect of the second surface after contacting the boss, so as to change the flow direction of the gas in the containing space when the battery monomer is in thermal runaway, slow down or offset the tendency of the electrode assembly to move upward under the pressure, reduce the risk of the exhaust hole on the insulating piece being blocked by the electrode assembly, thereby maintaining the unobstructedness of the exhaust hole when the battery monomer is in thermal runaway, and improving the reliability of the battery monomer.

[0052] The battery monomer disclosed by the embodiments of the present application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited thereto.

[0053] The embodiments of the present application provide an electric equipment using the battery device as a power supply, which can be but is not limited to mobile phones, tablets, notebook computers, electric toys, electric tools, electric cars, electric cars, ships, spacecraft and the like. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles and spacecraft, and the like.

[0054] The battery device disclosed by the embodiments of the present application can be applied to energy storage containers or energy storage cabinets and the like.

[0055] The battery device 1000 is described below in conjunction with the accompanying drawings.

[0056] Please refer to Figure 1 and Figure 3 , Figure 1 the structural schematic diagram of the charging network 1 provided by some embodiments of the present application, Figure 3A structural schematic diagram of the energy storage device 2000 is provided for some embodiments of the present application. Embodiments of the present application provide a charging network 1, which includes a charging pile 3000 for charging an electric device. The charging network 1 can also include an energy storage device 2000, which is electrically connected to the charging pile 3000, and the energy storage device 2000 is configured to provide electric energy for the charging pile 3000.

[0057] It should be noted that the charging pile 3000 is electrically connected to the battery cell in the energy storage device 2000 through a cable, and the battery cell can provide the stored electric energy to the charging pile 3000. The charging pile 3000 has a connector, which can be connected to the electric device, so as to provide energy to the electric device. The charging network 1 applies the energy storage device 2000, which can effectively improve the safety of the charging network 1, and also helps to improve the flexibility of the charging network 1 when deployed.

[0058] In one charging network 1, the charging pile 3000 can be one, and the energy storage device 2000 provides electric energy for the charging pile 3000; the charging pile 3000 can also be multiple, and the energy storage device 2000 provides electric energy for multiple charging piles 3000.

[0059] As an example, as shown in Figure 1 , the charging network 1 includes one energy storage device 2000 and two charging piles 3000, and one energy storage device 2000 provides electric energy for two charging piles 3000.

[0060] The energy storage device 2000 can include a battery device 1000, which is electrically connected to the charging pile 3000, so as to provide electric energy for the charging pile 3000.

[0061] Please refer to Figure 2 and Figure 3 , Figure 2 A structural schematic diagram of the energy storage system 2 is provided for some embodiments of the present application. Embodiments of the present application provide an energy storage system 2. The energy storage system 2 includes an energy storage converter 4000, which can be electrically connected to a power generation device 3 to convert the electric power provided by the power generation device 3. The energy storage system 2 can also include an energy storage device 2000, which is electrically connected to the energy storage converter 4000, and the energy storage converter 4000 converts the electric energy provided by the power generation device 3 and introduces it into the energy storage device 2000 for storage.

[0062] The power conversion device is used to connect between the power generation device 3 and the energy storage device 2000. The power generation device 3 is used to generate electric energy, and the power generation device 3 is used to store the generated electric energy into the energy storage device 2000 through the power conversion device. The energy storage system 2 applies the energy storage device 2000, which can effectively improve the operation safety of the energy storage system 2. In specific implementation, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. The specific type of the power generation equipment is not limited in the present application.

[0063] As an example, as shown in Figure 2 , the energy storage system 2 includes an energy storage device 2000 and an energy storage converter 4000, and two power generation devices 3 respectively transmit the generated electric energy to the energy storage converter 4000, and the electric energy is introduced into the energy storage device 2000 through the energy storage converter 4000 for storage.

[0064] Please refer to Figure 3 , the energy storage device 2000 includes an energy storage box 210, and the energy storage box 210 is provided with a battery device 1000.

[0065] As an example, the energy storage device 2000 can be an energy storage container, an energy storage cabinet, etc.

[0066] As an example, the energy storage device 2000 can be used for energy storage power station, wind power generation system, solar power generation system, mobile power system or temporary power supply system, etc. The energy storage power station can store electric energy when the electricity consumption is low, and provide electric energy for related users or electric equipment when the electricity consumption is high. The wind turbine generator set of the wind power generation system collects wind energy and converts it into electric energy, which is stored by the energy storage device 2000. The solar power generation system can convert solar energy into electric energy, which is stored by the energy storage device 2000 and supplied to users in time. The mobile power system can supply power to related electric equipment in places where the power grid power supply system cannot reach, such as remote mountainous areas and remote wild areas. The temporary power supply system can supply power to users in the case of insufficient power supply.

[0067] Please refer to Figure 4 , Figure 4A perspective structural schematic diagram of a battery device provided by an embodiment of the present application is shown. The battery device 1000 includes a box 200 and a battery cell 100, and the battery cell 100 is accommodated in the box 200. The box 200 is used to provide an accommodation space for the battery cell 100, and the box 200 can adopt various structures. In some embodiments, the box 200 can include a first part 201 and a second part 202, the first part 201 and the second part 202 are mutually covered, and the first part 201 and the second part 202 jointly define an accommodation space for accommodating the battery cell 100. The second part 202 can be a hollow structure with one end open, and the first part 201 can be a plate-shaped structure, the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define the accommodation space; the first part 201 and the second part 202 can also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box 200 formed by the first part 201 and the second part 202 can have various shapes, such as a cylinder, a cuboid, etc.

[0068] In the battery device 1000, the battery cell 100 can be multiple, and the multiple battery cells 100 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 100 are connected in series and in parallel. The multiple battery cells 100 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 100 is accommodated in the box 200; of course, the battery device 1000 can also be that the multiple battery cells 100 are first connected in series, in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, and the whole is accommodated in the box 200. The battery device 1000 can also include other structures, for example, the battery device 1000 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 100.

[0069] Each battery cell 100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 100 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0070] Please refer to Figure 5 , Figure 5 A perspective structural exploded schematic diagram of a battery cell provided by an embodiment of the present application is shown. The battery cell 100 refers to the smallest unit constituting the battery device 1000. As Figure 3 , the battery cell 100 includes a shell 10 (including an end cover 11 and a shell body 12), an electrode assembly 20 and an insulating member 30.

[0071] The end cover 11 refers to a component that covers the opening of the shell 12 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cover 11 can be adapted to the shape of the shell 12 to fit the shell 12. Optionally, the end cover 11 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 11 is not easily deformed when subjected to extrusion collision, so that the battery cell 100 can have higher structural strength, and the safety performance can also be improved. The end cover 11 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 20 for outputting or inputting the electrical energy of the battery cell 100. In some embodiments, the end cover 11 can also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold value. The material of the end cover 11 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations.

[0072] The shell 12 is a component for fitting the end cover 11 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 20, the electrolyte and other components. The shell 12 and the end cover 11 can be independent components, and an opening can be provided on the shell 12, and the end cover 11 is covered on the opening to form the internal environment of the battery cell 100. Without limitation, the end cover 11 and the shell 12 can also be integrated, specifically, the end cover 11 and the shell 12 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 12, the end cover 11 is covered on the shell 12. The shell 12 can be various shapes and various sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell 12 can be determined according to the specific shape and size of the electrode assembly 20. The material of the shell 12 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations.

[0073] The electrode assembly 20 is a component in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 20 can be contained in the shell 12. The electrode assembly 20 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have a portion of active material constituting the main part of the electrode assembly, and the positive and negative electrode sheets each have a portion without active material constituting the tab. The positive and negative tabs can be located together at one end of the main part or at two ends of the main part, respectively. In the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

[0074] The insulating piece 30 mainly undertakes the functions of electrical insulation and sealing in the battery monomer, and can be but is not limited to a plastic piece with excellent insulation performance and chemical corrosion resistance such as polypropylene, polyphenyl ether and nylon.

[0075] Generally, the insulating piece 30 can be divided into an upper plastic and a lower plastic. The upper plastic is usually arranged between the riveting block and the shell, used for isolating the riveting block and the shell, preventing short circuit and improving the electrical reliability of the battery monomer. In structure, the upper plastic is usually provided with a through hole to cooperate with the riveting block, the pole and other structures, playing a role of positioning, fixing and simplifying assembly, which helps to improve the compactness and stability of the battery monomer. The lower plastic is usually located between the top cover and the battery cell, mainly used for isolating the pole, the bus bar and the shell, preventing internal short circuit. At the same time, the lower plastic is usually provided with a liquid injection hole and is provided with a one-way valve structure, allowing the electrolyte to be injected into the shell while preventing liquid backflow or leakage, improving the injection efficiency and reliability. In the embodiments of the present application, only the lower plastic is taken as an example for description.

[0076] Please refer to Figures 1 to 7 The battery monomer 100 provided by the embodiments of the present application comprises a shell 10, an electrode assembly 20 and an insulating piece 30. The shell 10 has a containing space 101 inside. The electrode assembly 20 is arranged in the containing space 101. The insulating piece 30 is arranged between the inner wall of the shell 10 and the electrode assembly 20 along a preset direction X. The surface of the insulating piece 30 facing the electrode assembly 20 is provided with a boss 40. The boss 40 comprises a first surface 411 close to the electrode assembly 20 and a second surface 421 connected between the first surface 411 and the surface of the insulating piece 30 facing the electrode assembly 20. The distance between the second surface 421 and the electrode assembly 20 decreases along the direction close to the first surface 411. The second surface 421 is used for guiding at least part of the gas generated by the electrode assembly 20.

[0077] The shell 10 is an external structural piece in the battery monomer 100, used for defining the shape structure of the battery monomer 100 and providing a relatively stable and sealed working environment for the normal work of the battery monomer 100.

[0078] The shell 10 has a containing space 101 inside, which means that the shell 10 is a surrounding structure and the containing space 101 is the internal space of the shell 10. After the battery monomer 100 is packaged, the electrode assembly 20 is contained in the containing space 101 and soaked in the electrolyte.

[0079] The insulation piece 30 is arranged between the inner wall of the shell 10 and the electrode assembly 20 in the preset direction X, which means that the electrode assembly 20 and the insulation piece 30 are sequentially arranged in the accommodation space 101 during the assembly of the battery monomer 100, and the shell 10 and the electrode assembly 20 are cooperatively formed into a stable structure through the insulation piece 30.

[0080] The preset direction X can be the direction in which the electrode assembly 20 and the insulation piece 30 are placed into the accommodation space 101 during the assembly of the battery monomer 100.

[0081] The surface of the insulation piece 30 facing the electrode assembly 20 is provided with a boss 40. The boss 40 mainly serves to increase the size of the insulation piece 30 in the preset direction X, so as to reduce the movement space of the electrode assembly 20 in the preset direction X through the structure of the boss 40, thereby limiting the movement of the electrode assembly 20 in the preset direction X and improving the reliability of the battery monomer under vibration or drop working conditions. Meanwhile, the material of the insulation piece 30 itself can reduce the risk of contact short circuit between the electrode assembly 20 and the shell 10.

[0082] The boss 40 is arranged on the insulation piece 30. In possible embodiments, the boss 40 and the insulation piece 30 are respectively formed, and the two can be fixedly connected by welding, bonding, injection molding, etc., but are not limited to the above. In some embodiments, the boss 40 and the insulation piece 30 can also be detachably connected by clamping, sliding connection, connecting pieces (screws, bolts), etc.

[0083] The boss 40 includes a first surface 411 close to the electrode assembly 20 and a second surface 421 connected between the first surface 411 and the surface of the insulation piece 30 facing the electrode assembly 20. That is, the first surface 411 and the second surface 421 are the outer surfaces of the boss 40 corresponding to the side of the insulation piece 30 close to the electrode assembly 20, and are the surfaces of the boss 40 actually and directly contacting the accommodation space 101 on the side close to the electrode assembly 20.

[0084] It should be noted that in the embodiments of the present application, the boss 40 can be a solid or hollow block structure. At this time, the surface of the boss 40 close to the insulation piece 30 is connected with the insulation piece 30, so it can be regarded as an internal connecting surface. In some embodiments, the boss 40 can also be a semi-enclosed structure. At this time, the surface of the boss 40 close to the insulation piece 30 is also bent, and the opening end of the boss 40 is connected with the insulation piece 30.

[0085] The first surface 411 is a surface of the boss 40 closest to the electrode assembly 20 in the preset direction X, and the second surface 421 is a surface of the boss 40 connecting the first surface 411 and the insulating member 30 and facing the electrode assembly 20, that is, the second surface 421 can be regarded as an outer side wall surface of the boss 40.

[0086] The distance between the second surface 421 and the electrode assembly 20 decreases in the direction close to the first surface 411, and at least part of the gas generated by the second surface 421 is guided, which means that the second surface 421 is an inclined surface arranged obliquely compared with the first surface 411, and in the preset direction X, the distance between the second surface 421 and the electrode assembly 20 decreases in the direction of the insulating member 30 close to the first surface 411. In this way, the gas generated in the accommodation space 101 can flow to the electrode assembly 20 under the guidance of the second surface 421, and the risk of the electrode assembly 20 rising under the pressure is reduced.

[0087] It can be understood that the change of the distance between the second surface 421 and the electrode assembly 20 in the preset direction X only occurs when the second surface 421 is an inclined surface. When the second surface 421 is parallel to the first surface 411, the distance between each point on the second surface 421 and the electrode assembly 20 remains the same. When the second surface 421 is perpendicular to the first surface 411, the distance between the second surface 421 and the electrode assembly 20 refers to the distance between the side of the second surface 421 close to the electrode assembly 20 and the electrode assembly 20, and the distance between each point on the side and the electrode assembly 20 also remains the same.

[0088] In the embodiments of the present application, the distance between the second surface 421 and the electrode assembly 20 decreases in the direction close to the first surface 411 in the preset direction X. Possible implementation manners are that the second surface 421 can be a plane, the second surface 421 as a whole is an inclined surface, or in some embodiments, part of the second surface 421 can be arranged to be an inclined surface compared with the first surface 411, so that the second surface 421 can guide the gas generated in the accommodation space 101 to the electrode assembly 20.

[0089] In some embodiments, the distance between the second surface 421 and the electrode assembly 20 can gradually decrease in the direction close to the first surface 411, in which the second surface 421 can gradually decrease continuously, that is, the second surface 421 as a whole is a curved surface, or the second surface 421 can gradually decrease discontinuously in a stepped shape.

[0090] It should be noted that when determining the distance between the second surface 421 and the electrode assembly 20, the reference surface on the electrode assembly 20 selected is perpendicular to the preset direction X.

[0091] When the battery cell 100 is in thermal runaway, the electrode assembly 20 generates a large amount of high-temperature gas in the accommodation space 101, so that the temperature and pressure in the accommodation space 101 rise sharply. At this time, the pressure relief device provided on the shell 10 works when the pressure in the accommodation space 101 reaches a critical value, so that the accommodation space 101 is communicated with the outside, and the high-temperature and high-pressure gas in the accommodation space 101 can be released to the outside through the pressure relief device.

[0092] In the working state of the pressure relief device, the flow direction of the high-temperature gas in the accommodation space 101 is generally first along the preset direction X, and after contacting the insulating piece 30, the flow direction is blocked by the insulating piece 30 and begins to flow along the direction parallel to the surface of the insulating piece 30 close to the electrode assembly 20, and then flows to the position of the pressure relief device through the exhaust hole provided on the insulating piece 30 or the boss 40, and finally is released to the outside through the pressure relief device.

[0093] In the embodiments of the present application, since the distance between the second surface 421 and the electrode assembly 20 decreases in the direction close to the first surface 411 in the preset direction X, at least part of the second surface 421 is an inclined surface, and then the gas generated by thermal runaway can flow to the electrode assembly under the guiding action of the second surface 421 when flowing in the direction parallel to the surface of the insulating piece 30 close to the electrode assembly 20 after contacting the second surface 421. In this way, the flow direction of the high-temperature gas in the accommodation space 101 can be changed by the second surface 421, and the tendency of the electrode assembly to move upward under the action of pressure can be slowed down or offset by the high-temperature gas, thereby reducing the risk that the exhaust hole on the insulating piece is blocked by the electrode assembly, so that the exhaust hole remains unobstructed when the battery cell 100 is in thermal runaway, and the reliability of the battery cell is improved.

[0094] According to the battery cell 100 provided by the embodiments of the present application, by setting the distance between the second surface 421 and the electrode assembly 20 to decrease in the direction close to the first surface 411, that is, the second surface 421 is an inclined surface inclined to the inside of the insulating piece 30 in the direction of the insulating piece 30 towards the electrode assembly 20, when the gas generated in the accommodation space 101 flows in the direction parallel to the insulating piece 30 under the blocking action of the insulating piece 30, it can flow in the direction towards the electrode assembly 20 under the guiding action of the second surface 421 after contacting the boss 40. In this way, the flow direction of the gas in the accommodation space 101 when the battery cell 100 is in thermal runaway can be changed, the tendency of the electrode assembly 20 to move upward under the action of pressure can be slowed down or offset, the risk that the exhaust hole on the insulating piece 30 is blocked by the electrode assembly 20 can be reduced, so that the exhaust hole remains unobstructed when the battery cell 100 is in thermal runaway, and the reliability of the battery cell 100 is improved.

[0095] In some embodiments, the boss 40 further comprises an exhaust hole 43, one end of which is located on the first surface 411 and / or the second surface 421, and the other end of which is in communication with the side of the insulation piece 30 away from the electrode assembly 20.

[0096] The exhaust hole 43 functions to communicate the two ends of the insulation piece 30 in the preset direction X in the containing space 101, so that the gas pressure generated by the electrode assembly 20 when thermal runaway occurs is transmitted to the shell 10, and the gas flows to the pressure relief device provided on the shell 10 through the exhaust hole 43.

[0097] The one end of the exhaust hole 43 located on the first surface 411 and / or the second surface 421 and the other end in communication with the side of the insulation piece 30 away from the electrode assembly 20 means that the exhaust hole 43 is a structure penetrating the insulation piece 30 and the boss 40, wherein one end of the exhaust hole 43 can be provided on the first surface 411 or the second surface 421, or can be provided on both the first surface 411 and the second surface 421, and the other end is provided on the surface of the insulation piece 30 away from the electrode assembly 20, so as to communicate the two ends of the insulation piece 30 in the preset direction X.

[0098] In these embodiments of the present application, the cross-sectional shape of the exhaust hole 43 can be, but is not limited to, circular, oval, rectangular, or oblate.

[0099] It should be noted that in the embodiment in which the boss 40 is a solid structure, when the exhaust hole 43 is provided on the second surface 421, the exhaust hole 43 can be provided as a bent hole structure, which realizes the purpose of communicating the two sides of the insulation piece 30 in the preset direction X by bending inside the boss 40; and in the embodiment in which the boss 40 is a hollow structure or a semi-enclosed structure, the exhaust hole 43 can be provided as a straight cylindrical through hole.

[0100] In some embodiments, the number of exhaust holes 43 on the second surface 421 is 2 to 15.

[0101] In these embodiments of the present application, the exhaust holes 43 can be arranged in a straight line or arrayed on the second surface 421, and the number and distribution type of the exhaust holes 43 can be selected according to the size of the battery monomer 100.

[0102] For example, in some embodiments, the number of exhaust holes 43 can be set to 4, 8, 10, or 12 to adapt to different battery monomers 100, and the applicability is stronger.

[0103] In some embodiments, the flow area of the exhaust hole 43 is 12mm 2 to 150mm 2 .

[0104] The flow area of the exhaust hole 43 refers to the cross-sectional area of the gas flowing in the exhaust hole 43, and the larger the flow area, the better the exhaust effect. In the present application, the flow area of the exhaust hole 43 is set to 12 mm 2 to 150 mm 2 , so that each exhaust hole 43 has good exhaust effect and meets the exhaust needs of the battery monomer 100 when thermal runaway occurs.

[0105] For example, in the embodiments of the present application, the flow area of the exhaust hole 43 can be, but is not limited to, 30 mm 2 , 50 mm 2 , 80 mm 2 , 100 mm 2 or 120 mm 2 .

[0106] For reference Figures 1 to 11 , in some embodiments, the boss 40 includes a first wall 41 close to the electrode assembly 20 and a second wall 42 connected to the periphery of the first wall 41, and the first wall 41 and the second wall 42 enclose the exhaust space 102; the first surface 411 is the surface of the first wall 41 away from the exhaust space 102, the second surface 421 is the surface of the second wall 42 away from the exhaust space 102, and the exhaust hole 43 is arranged through the first wall 41 and / or the second wall 42 in the thickness direction.

[0107] The boss 40 includes a first wall 41 close to the electrode assembly 20 and a second wall 42 connected to the periphery of the first wall 41, and the first wall 41 and the second wall 42 enclose the exhaust space 102, that is, in the embodiments of the present application, the boss 40 is the aforementioned semi-enclosed structure, at this time, the boss 40 can be regarded as being formed by bending the insulating piece 30 in the direction towards the electrode assembly 20, at this time, the exhaust hole 43 only needs to pass through the first wall 41 or the second wall 42 to communicate the two ends of the insulating piece 30 in the predetermined direction X, which simplifies the setting mode of the exhaust hole 43.

[0108] In the embodiments of the present application, the boss 40 and the insulating piece 30 can be integrally formed by die casting or injection molding, so as to improve the structural consistency between the boss 40 and the insulating piece 30, and further improve the reliability of the battery monomer 100.

[0109] The exhaust space 102 is a space on the side of the insulating member 30 opposite to the electrode assembly 20. In this way, the boss 40 is protrudingly arranged towards the electrode assembly 20 on the side of the insulating member 30 close to the electrode assembly 20, and is recessed along the preset direction X and forms the exhaust space 102 on the side away from the electrode assembly 20, so that the boss 40 can reduce the material usage and the self weight of the boss 40 under the premise of meeting the insulation requirement between the electrode assembly 20 and the shell 10, and effectively improve the mass energy density of the battery monomer 100.

[0110] Please refer to Figures 1 to 12 In some embodiments, the battery monomer 100 further comprises a support member 50 connected to the side of the boss 40 close to the end cover 11.

[0111] The support member 50 is connected to the side of the boss 40 close to the end cover 11 to provide support for the boss 40 by the support member 50, further improving the structural stability of the boss 40 when the battery monomer 100 is in thermal runaway.

[0112] In the embodiments of the present application, the support member 50 can be made of a metal material with certain structural strength, and the support member 50 can be but not limited to an aluminum mesh, a copper mesh or an iron mesh. When the battery monomer 100 is in thermal runaway, the insulating member 30 or the boss 40 is easy to soften in a high-temperature and high-pressure environment, at this time, the support member 50 can provide support for the boss 40 or the insulating member 30, so that the shape thereof can be generally maintained.

[0113] The connection mode between the support member 50 and the boss 40 can be but not limited to adhesion, welding, clamping, injection molding, etc.

[0114] In some embodiments, the support member 50 comprises a main body part 51 and a support part 52, the support part 52 is arranged on the periphery of the main body part 51, the main body part 51 is connected with the first wall 41 and the support part 52 is connected with the second wall 42, the main body part 51 and the support part 52 are provided with a relief hole 103 corresponding to the exhaust hole 43, and the relief hole 103 is in communication with the exhaust hole 43.

[0115] The main body part 51 and the support part 52 are respectively structures in the support member 50 adapted to the first wall 41 and the second wall 42 of the boss 40, wherein the shape of the main body part 51 can be adapted to the surface of the first wall 41 away from the first surface 411, and the shape of the support part 52 can be adapted to the surface of the second wall 42 away from the second surface 421.

[0116] The avoiding hole 103 is in communication with the exhaust hole 43, so that the gas flowing through the exhaust hole 43 is not hindered by the support 50 too much, which further improves the structural reliability of the battery monomer 100. It can be understood that the cross-sectional shape of the avoiding hole 103 can be matched with the cross-sectional shape of the exhaust hole 43, which can be but is not limited to circular, oval, rectangular or oblate.

[0117] It should be noted that in the embodiments of the present application, the structure of the support 50 is adapted to the structure of the boss 40, and the support part 52 is also inclined compared with the main body part 51 to adapt to the structure of the first wall 41 and the second wall 42 in the boss 40.

[0118] In some embodiments, the second surface 421 includes two first inclined surfaces 4211 oppositely arranged along the first direction Y and / or two second inclined surfaces 4212 oppositely arranged along the second direction Z, the first inclined surface 4211 and / or the second inclined surface 4212 are both arranged obliquely relative to the preset direction X, the first direction Y, the second direction Z and the preset direction X intersect with each other and are not coplanar; the exhaust hole 43 is arranged on the first inclined surface 4211 and / or the second inclined surface 4212.

[0119] The second surface 421 includes two first inclined surfaces 4211 oppositely arranged along the first direction Y and two second inclined surfaces 4212 oppositely arranged along the second direction Z, that is, the boss 40 is a trapezoidal structure, the first surface 411 is the smaller base surface of the trapezoidal structure, and the second surface 421 is four side wall surfaces oppositely arranged around the first surface 411.

[0120] The exhaust hole 43 is arranged on the first inclined surface 4211 and / or the second inclined surface 4212, which means that the arrangement position of the exhaust hole 43 can be selected as needed. In some embodiments, the exhaust hole 43 can be arranged on the first inclined surface 4211, in some embodiments, the exhaust hole 43 can also be arranged on the second inclined surface 4212, and in some embodiments, the exhaust hole 43 can be arranged on both the first inclined surface 4211 and the second inclined surface 4212. The selection can be made according to the flow direction of the gas in the containing space 101 when the battery monomer 100 is depressurized.

[0121] In some embodiments, the number of bosses 40 is multiple, and the multiple bosses 40 are distributed in the first direction Y intersecting with the preset direction X; and / or, the size of the boss 40 in the second direction Z intersecting with the preset direction X is equal to the size of the insulating part 30 in the second direction Z; the first direction Y and the second direction Z intersect.

[0122] The protrusions 40 are distributed in a first direction Y intersecting the preset direction X, so that the insulation piece 30 can maintain a proper spacing between the protrusions 40 and the electrode assembly 20 at each position in the first direction Y, thereby improving the insulation reliability between the electrode assembly 20 and the shell 10.

[0123] The number of the protrusions 40 can be selected according to the size ratio of the insulation piece 30 in the first direction Y to the size of the protrusions 40 in the first direction Y. When the ratio is large, a proper number of protrusions 40 can be added to improve the structural stability between the insulation piece 30 and the electrode assembly 20; when the ratio is small, a proper number of protrusions 40 can be reduced to reduce the interference of the protrusions 40 with the gas flow in the accommodation space 101, thereby improving the smoothness of the gas flow.

[0124] For example, in the embodiments of the present application, the number of the protrusions 40 can be three, two of which are arranged at the two ends of the insulation piece 30 in the first direction Y, and the remaining one is arranged at the middle part of the insulation piece 30 in the first direction Y. It can be understood that when the battery monomer 100 is in thermal runaway, the gas in the accommodation space 101 changes the flow direction under the obstruction of the insulation piece 30, and then flows along the first direction Y and contacts the three protrusions 40. At this time, the protrusion 40 arranged at the middle part of the insulation piece 30 in the first direction Y can be provided with two second surfaces 421, and the two protrusions 40 arranged at the two ends of the insulation piece 30 in the first direction Y can be provided with only one second surface 421 facing the middle part.

[0125] The size of the protrusion 40 in the second direction Z intersecting the preset direction X is equal to the size of the insulation piece 30 in the second direction Z. By setting the size of the protrusion 40 in the second direction Z equal to the size of the insulation piece 30 in the second direction Z, the size of the protrusion 40 in the second direction Z is increased, thereby increasing the area of the second surface 421 on the protrusion 40. In this way, the larger area of the second surface 421 has stronger guiding performance, and the setting area of the exhaust hole 43 can also be increased, which is beneficial to further improve the exhaust pressure relief performance of the battery monomer 100.

[0126] In the embodiments of the present application, since the size of the protrusion 40 in the second direction Z is equal to the size of the insulation piece 30 in the second direction Z, the gas in the second direction Z does not have the space condition to flow relative to the protrusion 40. At this time, the two opposite surfaces of the protrusion 40 in the second direction Z can be set as a plane structure perpendicular to the first surface 411.

[0127] In some embodiments, the minimum spacing between the first surface 411 and the insulation piece 30 is 3mm to 10mm.

[0128] That is, the height dimension of the boss 40 in the preset direction X is between 3 mm and 10 mm, and a larger outer surface area of the boss 40 and the volume of the boss 40 itself can also be obtained, which is beneficial to further improve the exhaust and pressure relief capacity of the battery monomer 100 in the case of thermal runaway.

[0129] Exemplarily, in the embodiments of the present application, the minimum distance between the first surface and the insulating piece 30 can be, but is not limited to, 5 mm, 7 mm or 9 mm.

[0130] In some embodiments, the included angle between the second surface 421 and the first surface 411 is between 95° and 150°.

[0131] Such a setting mode makes it possible to select the setting slope of the second surface 421 on the boss 40 as needed to adapt to battery monomers 100 of more specifications and sizes, and the applicability is stronger.

[0132] Exemplarily, in the embodiments of the present application, the included angle between the second surface 421 and the first surface 411 can be, but is not limited to, 110°, 120°, 130° or 140°.

[0133] In some embodiments, the insulating piece 30 is also provided with a vent hole group 60, the vent hole group 60 includes a plurality of vent holes 61, and the vent holes 61 are arranged through the insulating piece 30 along the preset direction X; in the preset direction X, the vent hole group 60 is arranged in a staggered manner with the boss 40.

[0134] The vent hole group 60 includes a plurality of vent holes 61, and the vent holes 61 are arranged through the insulating piece 30 along the preset direction X, wherein each vent hole 61 is independent of each other, and after the vent holes 61 are arranged through the insulating piece 30 along the preset direction X, the two sides of the insulating piece 30 along the preset direction X can also be communicated, so that the high-temperature gas generated by the thermal runaway of the electrode assembly 20 can quickly flow to the pressure relief device.

[0135] The vent hole group 60 and the boss 40 are arranged in a staggered manner in the preset direction X, that is, in the region of the insulating piece 30 where the boss 40 is not arranged, the vent hole group 60 can be arranged to utilize the vent hole group 60 to discharge a part of the high-temperature gas acting on the insulating piece 30 to the pressure relief device, so as to reduce the impact of the high-temperature gas on the insulating piece 30, and improve the reliability of the battery monomer 100.

[0136] However, in a single vent hole group 60, the plurality of vent holes 61 can be arranged in a staggered manner along the first direction Y or the second direction Z, or the plurality of vent holes 61 can also be arranged in a rectangular array, which can be selected as needed.

[0137] The shape of each vent hole 61 in a plane perpendicular to the preset direction X can be, but is not limited to, circular, rectangular, long strip-shaped, or triangular.

[0138] In some embodiments, the surface of the insulation piece 30 close to the electrode assembly 20 is provided with a groove 31, and a thickness adjusting platform 32 is arranged at the groove bottom of the groove 31; the vent hole group 60 is arranged in the groove 31 and / or the thickness adjusting platform 32.

[0139] The vent hole 43 and the vent hole 61 are both hole structures for communicating both sides of the insulation piece 30 along the preset direction X. In the embodiments of the present application, by arranging the groove 31 on the surface of the insulation piece 30 close to the electrode assembly 20, and arranging the thickness adjusting platform 32 at the groove bottom of the groove 31, and arranging the vent hole group 60 in the groove 31 and / or the thickness adjusting platform 32, the positions of different vent hole groups 60 and the positions of the vent hole 43 and the vent hole group 60 in the preset direction X are more hierarchical, which is conducive to the rapid discharge of high-temperature gas, so as to further improve the pressure relief efficiency of the battery monomer 100 when thermal runaway occurs.

[0140] In the embodiments of the present application, the groove 31 and the thickness adjusting platform 32 can be integrally formed with the insulation piece 30 by pressure casting or injection molding, so as to simplify the production steps of the battery monomer 100 and improve the production efficiency of the battery monomer 100.

[0141] The size of the thickness adjusting platform 32 in the preset direction X can be determined in the design stage of the battery monomer 100, so that the high-temperature gas flow is more efficiently discharged to the pressure relief device.

[0142] The embodiments of the present application also provide a battery device, which comprises the battery monomer 100 provided in any of the preceding embodiments.

[0143] The embodiments of the present application also provide an energy storage device, which comprises the battery device provided in any of the preceding embodiments.

[0144] The embodiments of the present application also provide an energy storage system, which comprises an energy storage converter and the energy storage device provided in any of the preceding embodiments, and the energy storage converter is used to electrically connect a power generation device and the energy storage device.

[0145] The embodiments of the present application also provide a charging network, which comprises a charging pile and the energy storage device provided in any of the preceding embodiments, and the energy storage device is used to provide electric energy for the charging pile.

[0146] According to some embodiments of the present application, please refer to Figures 1 to 12The battery monomer 100 comprises a shell 10, an electrode assembly 20, an insulating piece 30 and a support piece 50, wherein the shell 10 has a containing space 101 inside; the electrode assembly 20 is arranged in the containing space 101; the insulating piece 30 is arranged between the inner wall of the shell 10 and the electrode assembly 20 along a preset direction X, and the surface of the insulating piece 30 facing the electrode assembly 20 is provided with a boss 40, the boss 40 comprises a first surface 411 close to the electrode assembly 20 and a second surface 421 connected between the first surface 411 and the surface of the insulating piece 30 facing the electrode assembly 20; the distance between the second surface 421 and the electrode assembly 20 decreases along the direction close to the first surface 411, and the second surface 421 is used for guiding at least part of the gas generated by the electrode assembly 20.

[0147] The surface of the insulating piece 30 facing the electrode assembly 20 is provided with the boss 40, and the boss 40 mainly functions to increase the size of the insulating piece 30 in the preset direction X, so as to reduce the moving space of the electrode assembly 20 in the preset direction X through the structure of the boss 40, thereby limiting the movement of the electrode assembly 20 in the preset direction X and improving the reliability of the battery monomer under the working conditions of vibration or falling.

[0148] The boss 40 comprises the first surface 411 close to the electrode assembly 20 and the second surface 421 connected between the first surface 411 and the surface of the insulating piece 30 facing the electrode assembly 20, that is, the first surface 411 and the second surface 421 are the outer surfaces of the boss 40 corresponding to the side of the insulating piece 30 close to the electrode assembly 20, and are the surfaces of the boss 40 actually and directly contacting the containing space 101 on the side close to the electrode assembly 20.

[0149] The first surface 411 is the surface of the boss 40 closest to the electrode assembly 20 along the preset direction X, and the second surface 421 is connected between the first surface 411 and the surface of the insulating piece 30 facing the electrode assembly 20, that is, the second surface 421 can be regarded as the outer side wall surface of the boss 40.

[0150] The distance between the second surface 421 and the electrode assembly 20 in the preset direction X is different, which means that the second surface 421 and the first surface 411 are not in parallel or vertical relationship, and at least part of the second surface 421 is inclined relative to the first surface 411.

[0151] When thermal runaway occurs in the battery cell 100, a large amount of high-temperature gas is generated in the electrode assembly 20 in the accommodation space 101, so that the temperature and pressure in the accommodation space 101 rise sharply. At this time, the pressure relief device provided on the shell 10 works when the pressure in the accommodation space 101 reaches a critical value, so as to connect the accommodation space 101 with the outside, so that the high-temperature and high-pressure gas in the accommodation space 101 can be released to the outside through the pressure relief device.

[0152] In the working state of the pressure relief device, the flow direction of the high-temperature gas in the accommodation space 101 is generally first along the preset direction X, and after contacting the insulating piece 30, it is blocked by the insulating piece 30 and begins to flow along the direction parallel to the surface of the insulating piece 30 close to the electrode assembly 20, and then flows to the position of the pressure relief device through the exhaust hole opened on the insulating piece 30 or the boss 40, and finally released to the outside through the pressure relief device.

[0153] The boss 40 further comprises an exhaust hole 43, one end of the exhaust hole 43 is located at the first surface 411 and / or the second surface 421, and the other end of the exhaust hole 43 is used to communicate with the side of the insulating piece 30 away from the electrode assembly 20.

[0154] The one end of the exhaust hole 43 is located at the first surface 411 and / or the second surface 421, and the other end is used to communicate with the side of the insulating piece 30 away from the electrode assembly 20, which means that the exhaust hole 43 is a structure penetrating the insulating piece 30 and the boss 40, wherein one end of the exhaust hole 43 can be provided on the first surface 411 or the second surface 421, or can be provided on both the first surface 411 and the second surface 421, and the other end is provided on the surface of the insulating piece 30 away from the electrode assembly 20, so that the two ends of the insulating piece 30 along the preset direction X are communicated.

[0155] The boss 40 comprises a first wall 41 close to the electrode assembly 20 and a second wall 42 connected to the periphery of the first wall 41, and the first wall 41 and the second wall 42 enclose the exhaust space 102; the first surface 411 is the surface of the first wall 41 away from the exhaust space 102, and the second surface 421 is the surface of the second wall 42 away from the exhaust space 102, and the exhaust hole 43 is provided in the thickness direction and penetrates the first wall 41 and / or the second wall 42.

[0156] The support 50 is connected to the side of the boss 40 close to the end cover 11, so as to provide support for the boss 40 by the support 50, and further improve the structural stability of the boss 40 when the battery cell 100 occurs thermal runaway.

[0157] In the embodiments of the present application, the support 50 can be made of a metal material with certain structural strength, and the support 50 can be, but is not limited to, an aluminum mesh, a copper mesh or an iron mesh. When the battery cell 100 is in thermal runaway, the insulating member 30 or the boss 40 is prone to soften under the high-temperature and high-pressure environment, at this time, the support 50 can provide support for the boss 40 or the insulating member 30, so that the shape thereof can be generally maintained.

[0158] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0159] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a shell having an accommodating space inside; an electrode assembly arranged in the accommodating space; an insulating member arranged between an inner wall of the shell and the electrode assembly in a preset direction, a surface of the insulating member facing the electrode assembly being provided with a boss, the boss comprising a first surface close to the electrode assembly and a second surface connected between the first surface and the surface of the insulating member facing the electrode assembly, the second surface being arranged to guide at least part of the gas generated by the electrode assembly.

2. The battery cell of claim 1, wherein, The boss further comprises an exhaust hole, one end of the exhaust hole being located at the first surface and / or the second surface, and the other end of the exhaust hole being arranged to communicate with a side of the insulating member away from the electrode assembly.

3. The battery cell of claim 2, wherein, On the second surface, the number of the exhaust holes is 2 to 15; and / or, the flow area of the exhaust holes is 12 mm 2 to 150 mm 2 .

4. The battery cell of claim 2, wherein, The boss comprises a first wall close to the electrode assembly and a second wall connected at a periphery of the first wall, the first wall and the second wall enclosing an exhaust space; the first surface is a surface of the first wall away from the exhaust space, the second surface is a surface of the second wall away from the exhaust space, and the exhaust hole is arranged through the first wall and / or the second wall in a thickness direction.

5. The battery cell of claim 4, wherein, The battery cell further comprises a support connected at a side of the boss away from the electrode assembly.

6. The battery cell of claim 5, wherein, The support comprises a main body portion and a support portion, the support portion being arranged at a periphery of the main body portion, the main body portion being connected with the first wall and the support portion being connected with the second wall, the main body portion and the support portion being provided with an avoiding hole at a position corresponding to the exhaust hole, the avoiding hole being in communication with the exhaust hole.

7. The battery cell of claim 2, wherein, The second surface comprises two first inclined surfaces arranged opposite to each other in a first direction and / or two second inclined surfaces arranged opposite to each other in a second direction, the first inclined surfaces and / or the second inclined surfaces being arranged obliquely relative to the preset direction, the first direction, the second direction and the preset direction intersecting with each other and not being coplanar; The exhaust hole is arranged at the first inclined surface and / or the second inclined surface.

8. The battery cell of any one of claims 1 to 7, wherein, The number of the bosses is plural, the plural bosses being distributed in a first direction intersecting with the preset direction; and / or, a dimension of the boss in a second direction intersecting with the preset direction is equal to a dimension of the insulating member in the second direction; the first direction and the second direction intersecting with each other.

9. The battery cell of any one of claims 1 to 7, wherein, A minimum distance between the first surface and the insulating member is 3mm to 10mm; and / or, an included angle between the second surface and the first surface is between 95° and 150°.

10. The battery cell of any one of claims 1 to 7, wherein, The insulating member is further provided with a vent hole group, the vent hole group comprising a plurality of vent holes, the vent holes being arranged through the insulating member in the preset direction; In the preset direction, the vent hole group is arranged in a staggered manner with the boss.

11. The battery cell of claim 10, wherein, A surface of the insulating member close to the electrode assembly is provided with a groove and a thickness adjusting platform arranged at a bottom of the groove; The vent hole group is arranged at the groove and / or the thickness adjusting platform.

12. A battery device characterized by comprising: The battery cell comprises the battery cell as claimed in any one of claims 1 to 11.

13. An energy storage device, characterized by, The battery device as claimed in claim 12.

14. An energy storage system characterized by, The energy storage device as claimed in claim 13, comprising an energy storage converter device for electrically connecting a power generation device and the energy storage device.

15. A charging network characterized in that, The energy storage device as claimed in claim 13, comprising a charging post and the energy storage device for providing electrical energy to the charging post.

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