Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment. The battery device comprises a box body, a battery monomer assembly and a first limiting structure, the battery monomer assembly comprises a battery unit and an isolation plate, the battery unit comprises a plurality of battery monomers which are electrically connected, the isolation plate is located on one side of the battery unit along a first direction, each battery monomer comprises a pressure relief structure, and the isolation plate is provided with a matching structure which is opposite to the pressure relief structure along the first direction; and the matching structure is used for discharging emissions released from the pressure relief structure during pressure relief of the pressure relief structure. The two opposite sides of the battery unit in the second direction are connected with first limiting structures respectively, at least one first limiting structure is provided with an exposed conductive part, and the first limiting structures are used for limiting expansion deformation of the single batteries. A plurality of grooves are formed in one side, back on to the battery units, of the isolation plate, and are used for preventing emissions discharged from the matching structure from flowing to the exposed conductive part. The insulation performance of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, and more particularly, to a battery device and an electric appliance. BACKGROUND

[0002] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, electric tools, and the like.

[0003] In the development of battery technology, how to improve the insulation performance of the battery device is a research direction in the battery technology. INNOVATION CONTENT

[0004] The present application provides a battery device and an electric appliance, which can improve the insulation performance of the battery device.

[0005] The present application provides a battery device, which comprises a box body, a battery cell assembly, and a first limiting structure. The battery cell assembly comprises a battery unit and an isolation plate. The battery unit comprises a plurality of battery cells electrically connected. The isolation plate is located on one side of the battery unit along a first direction and is electrically connected with the battery unit. The battery cell comprises a pressure relief structure. The isolation plate is provided with a matching structure opposite to the pressure relief structure along the first direction. The matching structure is used for discharging the discharge material discharged from the pressure relief structure when the pressure relief structure discharges. The opposite sides of the battery unit along a second direction are respectively connected with the first limiting structure. At least one of the first limiting structures has an exposed conductive part. The first limiting structure is used for limiting the swelling deformation of the battery cell. The first direction intersects with the second direction. The side of the isolation plate away from the battery unit is provided with a plurality of grooves. The plurality of grooves are used for blocking the flow of the discharge material discharged from the matching structure to the exposed conductive part.

[0006] In the above technical solution, the battery device of the present application is provided with a plurality of grooves on the side of the isolation plate away from the battery unit. The grooves are used for containing part of the discharge material discharged, so as to increase the creepage distance of the discharge material, increase the insulation resistance between the conductive part of the out-of-control battery cell and the exposed conductive part of the first limiting structure, reduce the possibility of conduction between the out-of-control battery cell and the first limiting structure, and improve the insulation performance of the battery device.

[0007] In some embodiments, the outer circumferential side of at least one matching structure is surrounded by a plurality of grooves.

[0008] In the above technical solution, more discharge material enters the grooves, and the creepage distance of the discharge material is increased.

[0009] In some embodiments, the plurality of grooves comprises a plurality of groove groups arranged along a third direction, each groove group comprises a plurality of grooves arranged along a second direction in sequence, and the first direction, the second direction and the third direction are mutually perpendicular.

[0010] In the above technical solution, the regularity of the groove arrangement can be improved, the number of grooves can be easily controlled, and thus the creepage distance of the discharge of the battery cell can be easily designed.

[0011] In some embodiments, the isolation plate comprises a first end and a second end opposite to each other in the second direction, and the plurality of grooves of each groove group are arranged from the first end to the second end in intervals.

[0012] In the above technical solution, the number of grooves arranged in the path of the discharge of the out-of-control battery cell flowing to the first limiting structure can be increased, and thus the creepage distance of the discharge can be further improved.

[0013] In some embodiments, the isolation plate comprises a main body portion and two bus portions, the main body portion is connected to the two bus portions respectively on opposite sides of the main body portion along a third direction, the bus portions are connected to a plurality of bus bars, the plurality of bus bars are electrically connected to the battery cells, the main body portion is provided with a matching structure, the plurality of grooves are arranged in the main body portion, and the first direction, the second direction and the third direction are mutually perpendicular.

[0014] In the above technical solution, the plurality of grooves are arranged in the main body portion, and the plurality of grooves are close to the matching structure, so that the possibility of the discharge entering the grooves is improved.

[0015] In some embodiments, the bus portion has a first surface facing away from the battery cells, the main body portion has a second surface on which the grooves are arranged, the first surface protrudes from the second surface along a direction in which the pressure relief structure is directed to the matching structure opposite thereto.

[0016] In the above technical solution, the volume of the discharge deposited on the bus portion can be reduced, and the possibility of the discharge contacting the pole of the battery cell is further reduced.

[0017] In some embodiments, the battery device further comprises a second limiting structure, and the first limiting structures on opposite sides of the battery cells in the second direction are connected by the second limiting structure.

[0018] In the above technical solution, the overall structure formed by the battery cells, the first limiting structure and the second limiting structure can be assembled outside the box and then installed in the box, so that the assembly efficiency is improved, and the degree of freedom of the position in the box is higher.

[0019] In some embodiments, the number of the first limiting structures and the second limiting structures connected to the same battery cell is two, and the two second limiting structures are arranged on the opposite sides of the battery cell along the third direction, and the two first limiting structures and the two second limiting structures form a ring structure, and the plurality of grooves are used to block the emission from flowing to the second limiting structure along the third direction.

[0020] In the above technical solution, the plurality of grooves block the emission from flowing to the second limiting structure along the third direction, further improve the creepage distance between the emission and the second limiting structure, reduce the possibility of conduction between the out-of-control battery monomer and the second limiting structure, and improve the insulation performance of the battery device.

[0021] In some embodiments, the isolation plate includes a base layer, a cover layer, and a plurality of bus bars, the cover layer covers one side of the base layer away from the battery cell, at least part of each bus bar is arranged between the base layer and the cover layer, the battery cell is electrically connected with the bus bar, and the side of the cover layer away from the base layer is provided with a plurality of grooves.

[0022] In the above technical solution, the isolation plate is divided into the base layer and the cover layer, and the grooves are arranged on the cover layer, so that the cover layer can be processed separately without affecting the processing of the base layer, thereby improving the production efficiency.

[0023] In some embodiments, the cooperating structure is a through-hole structure.

[0024] In the above technical solution, the cooperating structure is arranged as a through-hole structure, which is not only convenient to manufacture, but also does not affect the emission of the emission.

[0025] In a second aspect, the embodiments of the present application also provide a power utilization device, which includes the above-mentioned battery device, and the battery device is used to provide or store electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without paying creative labor.

[0027] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0028] Figure 2 The structural schematic diagram of a battery device is provided for some embodiments of the present application;

[0029] Figure 3A structural schematic view of a battery unit and a first limiting structure in a battery device provided for some embodiments of the present application;

[0030] Figure 4 For Figure 3 An enlarged view at A;

[0031] Figure 5 A structural schematic view of a battery unit, a first limiting structure and a second limiting structure in a battery device provided for some embodiments of the present application;

[0032] Figure 6 A sectional view of an isolation plate in a battery device provided for some embodiments of the present application.

[0033] Reference signs of the detailed description are as follows:

[0034] 100, vehicle; 200, battery device; 300, controller; 400, motor;

[0035] 1, box body;

[0036] 2, battery cell assembly;

[0037] 21, battery unit; 211, battery cell; 212, pressure relief structure; 22, isolation plate; 221, cooperating structure; 222, groove; 223, groove group; 224, first end; 225, second end; 226, main body part; 2261, second surface; 227, busbar part; 2272, first surface; 228, busbar; 229, base layer; 220, cover layer;

[0038] 3, first limiting structure; 31, exposed conductive part;

[0039] 4, second limiting structure;

[0040] X, first direction; Y, second direction; Z, third direction. Detailed description

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0043] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment.

[0044] In the description of the application, it is necessary to note that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0045] The term "and / or" in this application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0046] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0047] "Multiple" appearing in this application refers to two or more (including two).

[0048] After the battery cell occurs thermal runaway, the pressure relief structure will spray a large amount of liquid electrolyte, especially for the lithium iron phosphate battery system, because the valve opening point of the battery cell belongs to the initial stage of thermal runaway, the corresponding temperature is not high, a large amount of electrolyte will be discharged from the pressure relief structure of the thermal runaway battery cell in liquid form. Especially for large capacity battery cells, the liquid electrolyte sprayed after thermal runaway may reach hundreds of grams, and after the thermal runaway ends, as the temperature decreases, the electrolyte that is gasified but fails to be discharged from the battery pack during the process will re-condense and liquefy and settle in the interior of the battery pack.

[0049] In some cases, the end plate, side plate and other key components of the battery module have corresponding insulation designs, but it cannot be guaranteed that all metal parts thereon are wrapped by the insulation layer, such as the locking bolt site of the end plate. Therefore, the liquid electrolyte sprayed after thermal runaway and the electrolyte that is not discharged from the battery pack and re-condenses will connect the conductive parts of the thermal runaway battery cell (including the pole, the top cover, the shell and the bus bar connected with the pole) and the metal parts such as the end plate. In this case, the insulation resistance of the battery module will be determined by the shortest creepage distance of the electrolyte connecting the conductive parts of the thermal runaway battery cell and the metal parts of the battery module. More specifically, the electrolyte will connect the original creepage distance between the conductive parts of the battery cell and the metal parts of the battery module, thereby forming an unstable path of liquid conduction, reducing the insulation performance of the battery device after thermal runaway.

[0050] In view of this, the present application provides a battery device, which increases the insulation resistance between the conductive parts of the thermal runaway battery cell and the exposed conductive parts of the limiting structure (such as the end plate) by arranging a plurality of grooves on the side of the isolation plate away from the battery cell, accommodating the electrolyte in the grooves, increasing the creepage distance of the electrolyte, thereby reducing the possibility of conduction between the thermal runaway battery cell and the limiting structure, and improving the insulation performance of the battery device.

[0051] The technical solutions described in the embodiments of the present application are applicable to various electric equipment using battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0052] The following embodiments are described for convenience of explanation, taking the electric equipment as a vehicle for example.

[0053] Figure 1 The structural schematic diagram of the vehicle 100 provided by some embodiments of the present application is shown.

[0054] As shown in the figure, the interior of the vehicle 100 is provided with a battery device 200, which can be arranged at the bottom, head or tail of the vehicle 100. The battery device 200 can be used for power supply of the vehicle 100, for example, the battery device 200 can be used as the operating power supply of the vehicle 100.

[0055] The vehicle 100 can also include a controller 300 and a motor 400, the controller 300 being used to control the battery device 200 to supply power to the motor 400, for example, for the power demand of the vehicle 100 during starting, navigation and driving.

[0056] In some embodiments of the present application, the battery device 200 can not only be used as the operating power supply of the vehicle 100, but also be used as the driving power supply of the vehicle 100, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 100.

[0057] Figure 2 A structural schematic diagram of the battery device provided in some embodiments of the present application is shown in the figure; Figure 3 A structural schematic diagram of the battery unit 21 and the first limiting structure 3 in the battery device provided in some embodiments of the present application is shown in the figure.

[0058] As shown in the figures, Figure 2 and Figure 3 The present application provides a battery device 200, which includes a box body 1, a battery monomer assembly 2 and a first limiting structure 3. The battery monomer assembly 2 includes a battery unit 21 and a separation plate 22, the battery unit 21 includes a plurality of battery monomers 211 electrically connected, the separation plate 22 is located at one side of the battery unit 21 along a first direction X and is electrically connected with the battery unit 21, the battery monomer 211 includes a pressure relief structure 212, the separation plate 22 is provided with a matching structure 221 opposite to the pressure relief structure 212 along the first direction X, the matching structure 221 is used for discharging the discharge from the pressure relief structure 212 when the pressure relief structure 212 is relieved. The opposite sides of the battery unit 21 along a second direction Y are respectively connected with the first limiting structure 3, at least one of which has a bare conductive part 31, the first limiting structure 3 is used for limiting the expansion deformation of the battery monomer 211, and the first direction X intersects with the second direction Y. Among them, the side of the separation plate 22 away from the battery unit 21 is provided with a plurality of grooves 222, and the plurality of grooves 222 are used for blocking the flow of the discharge from the matching structure 221 to the bare conductive part 31.

[0059] The battery device 200 mentioned in the embodiments of the present application can include one or more battery monomer assemblies 2 for providing voltage and capacity. The battery monomer assembly 2 includes a plurality of battery monomers 211, which are connected in series, in parallel or in mixed connection through busbars.

[0060] In some embodiments, the battery device 200 can be a battery pack, which includes a box 1 and one or more battery cell assemblies 2 accommodated in the box 1.

[0061] As an example, the box 1 can include a first box and a second box. The first box and the second box are fastened so that an enclosed space is formed inside the box 1 to accommodate the battery cell assembly 2. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0062] As an example, the box 1 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively so that an enclosed space is formed inside the box 1 to accommodate the battery cell assembly 2.

[0063] As an example, the box 1 can be part of a chassis structure of the vehicle 100. For example, the top cover of the box 1 can be at least part of a floor of the vehicle 100, or the frame of the box 1 can be at least part of a cross beam and a longitudinal beam of the vehicle 100.

[0064] In some embodiments, the battery device 200 refers to an energy storage device, which includes the box 1, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0065] In this application, the battery cell 211 can include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc. The embodiments of this application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of this application are also not limited thereto.

[0066] The battery cell 211 includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell 211 mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area coated with the positive electrode active material layer and a positive electrode tab connected to the positive electrode coating area, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery cell 211 as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area coated with the negative electrode active material layer and a negative electrode tab connected to the negative electrode coating area, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon. The material of the separator can be PP (polypropylene) or PE (polyethylene).

[0067] For example, the isolation plate 22 is composed of a signal acquisition component (such as FPC, PCB, FFC, etc.), a plastic structural component, a copper-aluminum row, etc., and is connected into a whole through a process such as hot pressing or riveting. The isolation plate 22 realizes the series and parallel connection of multiple battery cells 211, and the temperature sampling of the battery cells 211 and the voltage sampling function of the battery cells 211, and provides temperature and voltage to the BMS (battery management system) through the FPC / PCB and the connector component.

[0068] For example, the pressure relief structure 212 can be a scored explosion-proof valve, that is, a very fine "cross", "single" or "circle" score line is engraved on the end cover of the battery cell 211 by laser. The thickness of the metal at these scores is precisely controlled, which is a structural weak point. The pressure relief structure 212 can also be welded to the end cover, and the outer edge of the pressure relief structure 212 and the end cover is a weak welding point, and when the internal pressure rises, it will first be opened from this preset weak welding point. The pressure relief structure 212 can also be a circular sheet area preset on the end cover, which is processed by a process so that it can plastically deform under a certain pressure. Under normal pressure, the flip piece is concave inward to maintain sealing. When the pressure exceeds the threshold, the flip piece will instantaneously "flip and deform" to be convex outward, thereby opening the pressure relief channel.

[0069] The number of the matching structures 221 of the embodiment can be multiple, and the multiple matching structures 221 are arranged opposite to the multiple pressure relief structures 212 in the first direction X. Alternatively, at least two pressure relief structures 212 share one matching structure 221. The matching structure 221 of the embodiment can be a through-hole structure, and the discharge from the pressure relief structure 212 is discharged from the through-hole structure. The edge of the matching structure 221 can also be intermittently connected with other areas of the isolation plate 22, so that when the discharge is sprayed out, the intermittently connected area is first damaged, and the matching structure 221 is disconnected with other areas by the impact of the discharge, thereby discharging the discharge.

[0070] The discharge includes electrolyte, negative electrode material particles (such as graphite), positive electrode material particles (such as nickel cobalt manganese acid lithium, iron lithium phosphate, lithium cobaltate, etc.), and debris of copper foil and aluminum foil, and thus has electrical conductivity.

[0071] The battery unit 21 of the embodiment is connected with the first limiting structure 3 on the opposite sides in the second direction Y, that is, at least one first limiting structure 3 is connected on the opposite sides of the battery unit 21 in the second direction Y. The first limiting structure 3 is used to limit the swelling deformation of the battery monomer 211 in the charging and discharging process. The swelling deformation of the battery monomer 211 in the charging and discharging process can be in the second direction Y or in the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect with each other.

[0072] Optionally, the first limiting structure 3 can be two limiting beams in the box body 1, and the two limiting beams are located on the opposite sides of the battery unit 21 in the second direction Y and are used to limit the swelling deformation of the battery monomer 211 in the second direction Y. At least one limiting beam has a bare conductive part, such as a welding point or a locking point fixedly connected with other parts in the box body 1.

[0073] The groove 222 of the embodiment refers to a structure formed by the surface of the isolation plate 22 away from the battery unit 21 recessing to the battery unit 21. Optionally, the side wall and the bottom wall of the groove 222 are connected at an obtuse angle and smoothly transitioned. The arrangement of the multiple grooves 222 can be arrayed or scattered.

[0074] Optionally, the depth of the groove 222 is greater than or equal to 0.1 mm.

[0075] When a certain battery monomer 211 occurs thermal runaway, the discharge is sprayed out from the matching structure 221 and falls on the surface of the isolation plate 22. The discharge enters the groove 222, and the groove 222 contains part of the discharge, thereby blocking the flow of the discharge to the bare conductive part 31.

[0076] The battery device 200 of the embodiment increases the creepage distance of the discharge by arranging a plurality of grooves 222 on the side of the isolation plate 22 facing away from the battery cell 21, and accommodating the part of the discharge leaked out in the grooves 222, increases the insulation resistance between the conductive part of the out-of-control battery cell 211 and the exposed conductive part 31 of the first limiting structure 3, reduces the possibility of the out-of-control battery cell 211 being in conduction with the first limiting structure 3, and improves the insulation performance of the battery device 200.

[0077] In some embodiments, the outer periphery of at least one of the fitting structures 221 is surrounded by a plurality of grooves 222.

[0078] For example, the plurality of grooves 222 can be arranged on the outer periphery of the fitting structure 221 to form a circle, or can be arranged on the outer periphery of the fitting structure 221 to form a rectangle or other shape.

[0079] In this way, more discharge enters the grooves 222, increasing the creepage distance of the discharge.

[0080] In some embodiments, the outer periphery of each of at least some of the fitting structures 221 is surrounded by a plurality of grooves 222.

[0081] The plurality of grooves 222 of the embodiment surround the fitting structure 221 from the inside to the outside. In order to save space, the overall shape formed by the arrangement of the plurality of grooves 222 can be the same, for example, a rectangle arranged on the periphery of the fitting structure 221.

[0082] Surrounding the outer periphery of the fitting structure 221 with the plurality of grooves 222 further improves the possibility of the discharged discharge entering the grooves 222, thereby increasing the creepage distance of the discharge.

[0083] Figure 4 For Figure 3 Enlarged view at A.

[0084] Please refer to Figure 4 In some embodiments, the plurality of grooves 222 includes a plurality of groove groups 223 arranged along a third direction Z, each groove group 223 includes a plurality of grooves 222 arranged along a second direction Y in sequence, and the first direction X, the second direction Y and the third direction Z intersect with each other.

[0085] The plurality of groove groups 223 of the embodiment are arranged in sequence along the third direction Z, and when the number of groove groups 223 is more than two, the distance between adjacent two groove groups 223 can be the same or different.

[0086] Each slot group 223 includes a plurality of grooves 222 arranged in the second direction Y in sequence, and the number of grooves 222 in each slot group 223 can be the same or different. The distance between two adjacent grooves 222 in one slot group 223 can be the same or different.

[0087] The shapes of the plurality of grooves 222 in the embodiment can be the same or different. When the shapes of the grooves 222 are the same, the sizes of the grooves 222 can be the same or different.

[0088] Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other in pairs.

[0089] In this way, the regularity of the arrangement of the grooves 222 can be improved, the number of the grooves 222 is facilitated to be controlled, and thus the creepage distance of the discharge of the battery cell 211 is facilitated to be designed.

[0090] In some embodiments, the isolation plate 22 includes a first end 224 and a second end 225 opposite to each other in the second direction Y, and the plurality of grooves 222 in each slot group 223 are arranged from the first end 224 to the second end 225.

[0091] In this way, the number of the grooves 222 arranged in the path of the discharge of the battery cell 211 flowing into the first limiting structure 3 can be increased, and thus the creepage distance of the discharge is further improved, that is, the insulation resistance between the conductive part of the battery cell 211 and the exposed conductive part 31 is improved.

[0092] Figure 5 The structural schematic diagram of the battery unit, the first limiting structure and the second limiting structure in the battery device provided by some embodiments of the present application is shown.

[0093] Please refer to Figure 5 In some embodiments, the isolation plate 22 includes a main body part 226 and two busbar parts 227, the main body part 226 is connected to the two busbar parts 227 respectively on the opposite sides in the third direction Z, the busbar part 227 is connected to a plurality of busbars 228, the plurality of busbars 228 are electrically connected to the battery unit 21, the main body part 226 is provided with a matching structure 221, the plurality of grooves 222 are arranged in the main body part 226, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other in pairs.

[0094] The busbar part 227 in the embodiment is connected to the plurality of busbars 228, the busbar 228 is electrically connected to the pole of the battery cell 211, and the series connection, the parallel connection or the series-parallel connection of the plurality of battery cells 211 is realized.

[0095] The busbar part 227 in the embodiment is connected to the plurality of busbars 228, that is, the plurality of busbars 228 are arranged in the two busbar parts 227.

[0096] Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0097] The plurality of grooves 222 are arranged on the main body part 226, and the plurality of grooves 222 are close to the cooperating structure 221, so as to improve the possibility of the emission entering the grooves 222. In addition, the busbar 228 is the part connected with the pole of the battery cell 211, and the grooves 222 are not arranged on the busbar part 227, so as to reduce the deposition of the emission on the busbar part 227 and reduce the possibility of the emission directly contacting the pole.

[0098] Optionally, the plurality of groups of unit grooves are arranged from one side of the main body part 226 along the third direction Z to the other side along the third direction Z.

[0099] In some embodiments, the busbar part 227 has a first surface 2272 facing away from the battery cell 21, and the main body part 226 has a second surface 2261 on which the grooves 222 are arranged, and the first surface 2272 protrudes from the second surface 2261 along the direction in which the pressure relief structure 212 points to the cooperating structure 221 opposite to it.

[0100] The first surface 2272 of the present embodiment is located on one side of the second surface 2261 along the direction in which the pressure relief structure 212 points to the cooperating structure 221.

[0101] In this way, the volume of the emission deposited on the busbar part 227 can be reduced, and the possibility of the emission contacting the pole of the battery cell 211 can be further reduced.

[0102] Optionally, the entire busbar part 227 protrudes from the second surface 2261 along the direction in which the pressure relief structure 212 points to the cooperating structure 221 opposite to it.

[0103] In some embodiments, the battery device 200 further comprises a second limiting structure 4, and the first limiting structures 3 on the opposite sides of the battery cell 21 along the second direction Y are connected through the second limiting structure 4.

[0104] For example, the first limiting structures 3 on the opposite sides of the battery cell 21 along the second direction Y are connected through the second limiting structure 4, so as to limit the swelling deformation of the battery cell 211 along the second direction Y. For example, the battery cell 211 is a square battery cell 211, and the thickness direction of the battery cell 211 is the second direction Y.

[0105] For example, the first limiting structure 3 comprises an end plate, and the second limiting structure 4 is an annular metal belt, which is sleeved on the outer circumferential side of the two first limiting structures 3 and the battery cell 21, and tightly adheres the two end plates on the opposite sides of the battery cell 21 along the second direction Y.

[0106] In this way, the overall structure formed by the battery cell 21, the first limiting structure 3 and the second limiting structure 4 can be assembled outside the box body 1 and then installed in the box body 1, improving the assembly efficiency and having higher freedom in position setting in the box body 1.

[0107] In some embodiments, the number of the first limiting structure 3 and the second limiting structure 4 connected to the same battery cell 21 is two, and two second limiting structures 4 are arranged on the opposite sides of the battery cell 21 along the third direction Z, and the two first limiting structures 3 and the two second limiting structures 4 form a ring structure, and the plurality of grooves 222 are used to block the discharge from flowing to the second limiting structure 4 along the third direction Z.

[0108] Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0109] The first limiting structure 3 and the second limiting structure 4 of the embodiment can be plate-shaped structures, and the two first limiting structures 3 and the two second limiting structures 4 form a ring structure and are arranged outside the battery cell 21. The first limiting structure 3 and the second limiting structure 4 can be connected by locking with fastening components, such as riveting or bolt connection.

[0110] The plurality of grooves 222 block the discharge from flowing to the second limiting structure 4 along the third direction Z, further improve the creepage distance of the discharge and the second limiting structure 4, reduce the possibility of conduction between the uncontrolled battery cell 211 and the second limiting structure 4, and improve the insulation performance of the battery device 200.

[0111] Figure 6 A cross-sectional view of the isolation plate in the battery device provided by some embodiments of the present application.

[0112] Please refer to Figure 6 In some embodiments, the isolation plate 22 includes a base layer 229, a cover layer 220 and a plurality of bus bars 228, the cover layer 220 is covered on the side of the base layer 229 away from the battery cell 21, at least part of each bus bar 228 is arranged between the base layer 229 and the cover layer 220, the battery cell 21 is electrically connected to the bus bar 228, and the side of the cover layer 220 away from the base layer 229 is provided with a plurality of grooves 222.

[0113] The base layer 229 and the cover layer 220 of the embodiment can be plastic structures or plastic structures, etc. For example, the cover layer 220 and the base layer 229 can be flexible plastic films (such as PET).

[0114] Optionally, the thickness of the cover layer 220 is h1, the depth of the groove 222 is h2, and h1 / 2≤h2

[0115] At least part of each busbar 228 in the embodiment is arranged between the base layer 229 and the cover layer 220. For different busbars 228, part of the busbar 228 can be arranged between the base layer 229 and the cover layer 220, or the entire busbar 228 can be arranged between the base layer 229 and the cover layer 220.

[0116] The base layer 229 in the embodiment is provided with a hole structure corresponding to the busbar 228, so as to avoid welding or other connection of the busbar 228 and the pole.

[0117] The cover layer 220 in the embodiment can be provided with a through hole structure corresponding to the busbar 228, so as to weld the busbar 228 and the pole.

[0118] The isolation plate 22 is divided into the base layer 229 and the cover layer 220, and the groove 222 is arranged on the cover layer 220. The cover layer 220 can be processed separately, without affecting the processing of the base layer 229, thereby improving the production efficiency.

[0119] In some embodiments, the matching structure 221 is a through hole structure.

[0120] Optionally, a projection of the through hole structure on the pressure relief structure 212 along the first direction X completely covers the pressure relief structure 212.

[0121] The matching structure 221 is arranged as a through hole structure, which is not only convenient to manufacture, but also does not affect the ejection of the discharge.

[0122] The embodiments of the application further provide a power-using device, which comprises the above battery device 200, and the battery device 200 is used to provide or store electric energy.

[0123] Please refer to Figures 3-5The battery device 200 includes a box body 1, a battery monomer assembly 2 and a plurality of first limiting structures 3. The battery monomer assembly 2 includes a battery unit 21 and a separation plate 22. The battery unit 21 includes a plurality of electrically connected battery monomers 211. The separation plate 22 is located on one side of the battery unit 21 along a first direction X and is electrically connected with the battery unit 21. The battery monomer 211 includes a pressure relief structure 212. The separation plate 22 is provided with a matching structure 221 opposite to the pressure relief structure 212 along the first direction X. The matching structure 221 is used for discharging the discharge from the pressure relief structure when the pressure relief structure 212 is relieved. The battery unit 21 is respectively connected with the first limiting structure 3 on two opposite sides along a second direction Y. At least one of the first limiting structures 3 has a bare conductive part 31. The first limiting structure 3 is used for limiting the expansion deformation of the battery monomer 211. The first direction X intersects with the second direction Y. The side of the separation plate 22 away from the battery unit 21 is provided with a plurality of grooves 222. The plurality of grooves 222 are used for blocking the discharge from the matching structure 221 to flow to the bare conductive part 31. The plurality of grooves 222 include a plurality of groove groups 223 arranged along a third direction Z. Each groove group 223 includes a plurality of grooves 222 arranged in sequence along the second direction Y. The first direction X, the second direction Y and the third direction Z intersect with each other. The separation plate 22 includes a first end 224 and a second end 225 opposite to each other along the second direction Y. The plurality of grooves 222 of each groove group 223 are arranged from the first end 224 to the second end 225. The separation plate 22 includes a main body part 226 and two bus parts 227. The two bus parts 227 are respectively connected to two opposite sides of the main body part 226 along the third direction Z. The bus part 227 is connected with a plurality of bus bars 228. The plurality of bus bars 228 are electrically connected with the battery unit 21. The main body part 226 is provided with the matching structure 221. The plurality of grooves 222 are arranged on the main body part 226. The battery device 200 further includes a second limiting structure 4. The first limiting structures 3 on two opposite sides of the battery unit 21 along the second direction are connected through the second limiting structure 4. The first limiting structure 3 and the second limiting structure 4 jointly limit the expansion deformation of the battery unit 21 along the second direction Y. The separation plate 22 includes a base layer 229 and a cover layer 220. The cover layer 220 covers the side of the base layer 229 away from the battery unit 21. At least part of each bus bar 228 is arranged between the base layer 229 and the cover layer 220. The battery unit 21 is electrically connected with the bus bar 228. The side of the cover layer 220 away from the base layer 229 is provided with a plurality of grooves 222.

[0124] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0125] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery device, characterized by, The battery device comprises: a box body; a battery cell assembly comprising a battery cell and a separation plate, the battery cell comprising a plurality of battery cells electrically connected, the separation plate being located on one side of the battery cell along a first direction and electrically connected with the battery cell, the battery cell comprising a pressure relief structure, the separation plate being provided with a matching structure opposite to the pressure relief structure along the first direction, the matching structure being used for discharging the discharge from the pressure relief structure when the pressure relief structure is relieved; a first limiting structure, the opposite sides of the battery cell along a second direction are respectively connected with the first limiting structure, wherein at least one of the first limiting structures has an exposed conductive part, the first limiting structure is used for limiting the swelling deformation of the battery cell, and the first direction intersects the second direction; wherein the side of the separation plate away from the battery cell is provided with a plurality of grooves, and the plurality of grooves are used for blocking the flow of the discharge from the matching structure to the exposed conductive part.

2. The battery device according to claim 1, characterized by The outer circumferential side of at least one of the matching structures is surrounded by a plurality of grooves.

3. The battery device of claim 1, wherein The plurality of grooves comprises a plurality of groove groups arranged along a third direction, each groove group comprises a plurality of grooves arranged in sequence along the second direction, and the first direction, the second direction and the third direction intersect each other.

4. The battery device of claim 3, wherein The separation plate comprises a first end and a second end opposite to each other along the second direction, and the plurality of grooves of each groove group are arranged from the first end to the second end.

5. The battery device of claim 1, wherein The separation plate comprises a main body part and two busbar parts, the opposite sides of the main body part along a third direction are respectively connected with the busbar parts, the busbar parts are connected with a plurality of busbars, the plurality of busbars are electrically connected with the battery cell, the main body part is provided with the matching structure, and the plurality of grooves are arranged on the main body part, and the first direction, the second direction and the third direction intersect each other.

6. The battery device of claim 5, wherein, The busbar part has a first surface away from the battery cell, the main body part has a second surface provided with the grooves, and the first surface protrudes from the second surface along the direction in which the matching structure is opposite to the pressure relief structure.

7. The battery device according to any one of claims 1 to 6, wherein The battery device further comprises a second limiting structure, and the first limiting structures on the opposite sides of the battery cell along the second direction are connected through the second limiting structure.

8. The battery device of claim 7, wherein, The number of the first limiting structures and the second limiting structures connected with the same battery cell is two, two second limiting structures are arranged on the opposite sides of the battery cell along a third direction, and the first limiting structures and the second limiting structures form a ring structure, the plurality of grooves are used for blocking the flow of the discharge from the matching structure to the second limiting structure along the third direction, and the first direction, the second direction and the third direction intersect each other.

9. The battery device of claim 1, wherein, The isolation plate comprises a base layer, a cover layer and a plurality of busbars, the cover layer is covered on the side of the base layer away from the battery cell, at least part of each busbar is arranged between the base layer and the cover layer, the battery cell is electrically connected with the busbar, and the side of the cover layer away from the base layer is provided with the plurality of grooves.

10. The battery device of claim 1, wherein The matching structure is a through-hole structure.

11. An electrical device, characterized by The battery device comprises the battery device according to any one of claims 1-10, and the battery device is used for providing or storing electric energy.

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