Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment. The battery device comprises a box body, a battery monomer assembly and an adsorption part, a containing space is formed in the box body, the box body is provided with a top plate and a bottom plate which are oppositely arranged in the height direction of the box body, and the containing space is located between the top plate and the bottom plate; the battery monomer assembly is arranged in the accommodating space, the battery monomer assembly comprises a plurality of battery monomers and a confluence part, each battery monomer comprises an end cover, an electrode terminal and a pressure relief mechanism, the end cover faces the bottom plate, the electrode terminal and the pressure relief mechanism are arranged on the end cover, and the confluence part is electrically connected to the electrode terminals of any two battery monomers in the plurality of battery monomers; the adsorption part is arranged in the accommodating space, is positioned between the battery monomer assembly and the bottom plate, and is configured to adsorb a conductive substance sprayed by the pressure relief mechanism under the condition of thermal runaway. Therefore, the probability that the conductive substance is adsorbed on the surface of the battery monomer assembly is reduced, so that the risk of insulation failure in the box body is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device and an electrical device using the same. Background Art

[0002] A battery device generally has a box body and battery cells arranged inside the box body. The discharge substances ejected after thermal runaway of the battery cells include conductive substances such as electrolyte, positive electrode fragments, and conductive additives. These conductive substances are likely to accumulate inside the box body and adhere to the surface of internal charged components after condensation, shortening the creepage distance between the charged components and the box body, increasing the risk of system insulation failure, and affecting the safety of the battery device. Summary of the Utility Model

[0003] In view of the above problems, this application provides a battery device and an electrical device using the same, which can reduce the risk of insulation failure of the battery device.

[0004] In a first aspect, this application provides a battery device, including: a box body, an accommodation space is formed inside the box body, the box body has a top plate and a bottom plate oppositely arranged along its height direction, and the accommodation space is located between the top plate and the bottom plate; a battery cell assembly disposed in the accommodation space, the battery cell assembly includes a plurality of battery cells and a busbar component, each battery cell includes an end cap, an electrode terminal, and a pressure relief mechanism, the end cap faces the bottom plate, both the electrode terminal and the pressure relief mechanism are disposed on the end cap, and the busbar component is electrically connected to the electrode terminals of any two of the plurality of battery cells; and an adsorbent, the adsorbent is disposed in the accommodation space and is located between the battery cell assembly and the bottom plate, and the adsorbent is configured to adsorb the conductive substances ejected by the pressure relief mechanism in the case of thermal runaway.

[0005] In the above battery device, by arranging the end cap and the pressure relief mechanism of the battery cell facing the bottom plate, that is, inverting the battery cell in the box body, under the action of gravity, the conductive substances ejected by the pressure relief mechanism during thermal runaway fall onto the bottom plate after condensation, reducing the possibility of falling towards charged components such as electrode terminals and busbar components. At the same time, an adsorbent is disposed between the battery cell assembly and the bottom plate, which can adsorb the conductive substances on the adsorbent, further reducing the probability of the conductive substances being adsorbed on the surface of the battery cell assembly, reducing the influence of the conductive substances on the creepage distance inside the box body, thereby reducing the risk of insulation failure inside the box body and improving the safety of the battery device.

[0006] Optionally, the orthographic projection of each pressure relief mechanism along the height direction and the orthographic projection of the adsorbent along the height direction at least partially overlap. In this way, the conductive substances ejected by each pressure relief mechanism in the battery cell assembly during thermal runaway can be adsorbed more fully.

[0007] Optionally, the orthographic projection of each pressure relief mechanism along the height direction falls within the orthographic projection of the adsorbent along the height direction. In this way, the adsorbent can completely cover each pressure relief mechanism in the battery cell assembly in the direction of gravity, and can adsorb as much as possible the conductive substances ejected during the thermal runaway of the battery cell assembly.

[0008] Optionally, a receiving groove is formed by concaveing the surface of the adsorbent facing the battery cell. In this way, the groove wall of the receiving groove can play a certain limiting role, reducing the sputtering range of the discharged substances ejected during the thermal runaway of the pressure relief mechanism, so as to adsorb and fix the conductive substances on the adsorbent as much as possible.

[0009] Optionally, the number of the receiving grooves includes a plurality, and the plurality of receiving grooves are arranged in an array. In this way, by using the receiving grooves arranged in an array, the adsorption area of the adsorbent is expanded to maximize the adsorption of the conductive substances ejected in the case of thermal runaway of the pressure relief mechanism.

[0010] Optionally, the plurality of battery cells are arranged in sequence along a first direction, the adsorbent includes a plurality, each adsorbent extends along the first direction, and the plurality of adsorbents are arranged at intervals along a second direction, wherein the first direction, the second direction and the height direction are perpendicular to each other in pairs. In this way, it can flexibly adapt to the complex space inside the box body, so that the discharged substances in each area can be effectively adsorbed as much as possible. At the same time, the adsorbent includes a plurality of dispersed ones, which are easy to arrange and replace, and are convenient for quick replacement after the battery device is maintained or a thermal runaway occurs.

[0011] Optionally, the plurality of battery cells are arranged in sequence along a first direction, the size of the adsorbent along the first direction is greater than or equal to the size of the battery cell assembly along the first direction, wherein the first direction and the height direction are perpendicular to each other; and / or, the plurality of battery cells are arranged in sequence along a first direction, the size of the adsorbent along the second direction is greater than or equal to the size of the battery cell assembly along the second direction, wherein the first direction, the second direction and the height direction are perpendicular to each other in pairs. In this way, the coverage area of the adsorbent can be increased to improve the possibility of the adsorbent adsorbing the conductive substances ejected in the case of thermal runaway of the pressure relief mechanism.

[0012] Optionally, the adsorbent is arranged at intervals from the electrode terminal and the bus bar component. In this way, the possibility that the adsorbent contacts the charged components such as the bus bar component and the electrode terminal after adsorbing conductive substances such as electrolyte, resulting in short circuits of these charged components, is reduced, and the safety of the battery device is improved.

[0013] Optionally, the adsorbent is adsorption cotton, a carbon nanotube coating, or a molecular sieve adsorbent. In this way, the adsorbent has the advantages of large adsorption capacity, fast adsorption, strong chemical stability, etc., and can maximize the adsorption of the discharged substances ejected after the thermal runaway of the pressure relief mechanism.

[0014] Optionally, the bottom plate is made of a non-metallic material. In this way, the risk of insulation failure caused by the charged components on the battery cell assembly being too close to the bottom plate is reduced. At the same time, the heat conductivity of the non-metallic material is reduced, and the probability of condensation of the discharged substances ejected after the thermal runaway of the pressure relief mechanism is reduced.

[0015] Optionally, the box body further includes a surrounding plate, the surrounding plate is disposed around the outer periphery of the bottom plate and connected to the bottom plate, one end of the battery cell away from the end cover is connected to the top plate, and the top plate covers the side of the surrounding plate away from the bottom plate. In this way, during assembly, the battery cell can be first fixed on the top plate, and then the overall structure composed of the surrounding plate and the bottom plate can be covered outside the battery cell and connected to the top plate, improving the assembly convenience.

[0016] In a second aspect, the present application provides an electrical device, including the battery device described in the first aspect, and the battery device is used to provide electrical energy. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application;

[0019] Figure 2 is a schematic structural diagram of a battery device disclosed in an embodiment of the present application;

[0020] Figure 3 is an exploded structural diagram of a battery device disclosed in an embodiment of the present application;

[0021] Figure 4 is a top view schematic diagram of a battery device disclosed in an embodiment of the present application;

[0022] Figure 5 is Figure 4 a cross-sectional view of the battery device disclosed in the shown embodiment along the A-A direction;

[0023] Figure 6 is Figure 5 an enlarged view of the cross-sectional view shown at B;

[0024] Figure 7 It is a top view schematic diagram of the adsorbing component and the bottom plate in the battery device disclosed in another embodiment of the present application;

[0025] Figure 8 It is a top view schematic diagram of the adsorbing component and the bottom plate in the battery device disclosed in yet another embodiment of the present application.

[0026] In the drawings, the drawings are not drawn to actual scale.

[0027] Marking description:

[0028] 1000, vehicle; 100, battery device; 200, vehicle body main body;

[0029] 300, box body; 310, first part; 320, second part; 330, accommodating space; 340, top plate; 350, bottom plate; 360, surrounding plate; 400, battery cell assembly; 410, battery cell; 420, end cover; 430, outer shell; 440, electrode terminal; 450, pressure relief mechanism; 500, adsorbing component; 510, accommodating groove;

[0030] X, first direction; Y, second direction; Z, height direction. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0033] Reference to "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0034] In the description of this application, the term "plurality" means two or more (including two).

[0035] In the description of this application, technical terms such as "thickness", "bottom", "side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of this application.

[0036] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0037] A battery device generally has a box body and battery cells arranged in the box body. The conductive substances ejected after the thermal runaway of the battery cells include electrolyte, positive electrode fragments, conductive additives, etc. These conductive substances are likely to accumulate inside the box body and adhere to the surface of the internal charged components after condensation, shortening the creepage distance between the charged components and the box body, increasing the risk of system insulation failure, and affecting the safety of the battery device.

[0038] Based on the above considerations, the embodiments of this application provide a battery device, including a box body, a battery cell assembly, and an adsorbent. An accommodation space is formed inside the box body. The box body has a top plate and a bottom plate oppositely arranged along its height direction, and the accommodation space is located between the top plate and the bottom plate. The battery cell assembly is arranged in the accommodation space. The battery cell assembly includes a plurality of battery cells and a bus bar component. Each battery cell includes an end cap, an electrode terminal, and a pressure relief mechanism. The end cap faces the bottom plate, the electrode terminal and the pressure relief mechanism are arranged on the end cap, and the bus bar component is electrically connected to the electrode terminals of any two battery cells among the plurality of battery cells. The adsorbent is arranged in the accommodation space and is located between the battery cell assembly and the bottom plate. The adsorbent is configured to adsorb the conductive substances ejected by the pressure relief mechanism in the case of thermal runaway.

[0039] In the battery device provided by the embodiment of the present application, by arranging the end cap and the pressure relief mechanism of the battery cell towards the bottom plate, that is, by inverting the battery cell in the box body, under the action of gravity, the conductive substances ejected by the pressure relief mechanism during thermal runaway condense and then fall onto the bottom plate, reducing the possibility of falling towards charged components such as electrode terminals and busbar components. At the same time, an adsorbent is arranged between the battery cell assembly and the bottom plate, which can adsorb the conductive substances on the adsorbent, further reducing the probability of the conductive substances being adsorbed on the surface of the battery cell assembly, reducing the influence of the conductive substances on the creepage distance inside the box body, thereby reducing the risk of insulation failure inside the box body and improving the safety of the battery device.

[0040] The battery device mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0041] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module may be formed by tying a plurality of battery cells with a cable tie.

[0042] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0043] The battery device and the electrical equipment disclosed in the embodiment of the present application can be used in electrical equipment that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. The electrical equipment may be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy may include stationary or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft may include airplanes, rockets, space shuttles, and spaceships, etc.

[0044] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical equipment in an embodiment of the present application for illustration.

[0045] Figure 1 For the structural schematic diagram of the vehicle provided in some embodiments of the present application, please refer to Figure 1, the vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. The vehicle 1000 includes a battery device 100 and a vehicle body main body 200, and the battery device 100 is disposed on the vehicle body main body 200. The battery device 100 can be disposed at the bottom, the head, or the tail of the vehicle body main body 200. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000.

[0046] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0047] Figure 2 Schematic structural diagram of the battery device provided in some embodiments of the present application, Figure 3 Exploded view of the battery device provided in some embodiments of the present application, please refer to Figure 2 and Figure 3 , the battery device 100 includes a box body 300 and at least one battery cell assembly 400. The box body 300 can include a first part 310 and a second part 320, and the first part 310 and the second part 320 are covered with each other to accommodate the battery cell assembly 400. The first part 310 can be a hollow structure with an opening on one side, and the second part 320 can be a plate-like structure. The second part 320 is covered on the opening side of the first part 310. The first part 310 and the second part 320 can also both be hollow structures with an opening on one side, and the opening side of the second part 320 is covered on the opening side of the first part 310. Of course, the box body formed by the first part 310 and the second part 320 can be in various shapes, such as a cylinder, a cuboid, etc.

[0048] Inside the box body 300, each battery cell assembly 400 can include a plurality of battery cells 410, and the plurality of battery cells 410 are arranged in sequence. The plurality of battery cells 410 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 410. The plurality of battery cells 410 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the battery cell assembly 400 formed by the plurality of battery cells 410 is accommodated in the box body 300. Of course, the battery device 100 can also be in the form that a plurality of battery cells 410 are first connected in series, in parallel, or in a series-parallel combination to form battery cell assemblies, and then the plurality of battery cell assemblies are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 300. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing electrical connection among the plurality of battery cells 410.

[0049] Among them, each battery cell 410 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, but is not limited thereto. The battery cell 410 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0050] The battery cell 410 refers to the smallest unit that makes up the battery device 100. The battery cell 410 includes an end cap 420, a housing 430, an electrode assembly and other functional components.

[0051] The housing 430 is a hollow structure with an opening on one side. The end cap 420 refers to a component that covers the opening of the housing 430 to isolate the internal environment of the battery cell 410 from the external environment. Without limitation, the shape of the end cap 420 can be adapted to the shape of the housing 430 to cooperate with the housing 430. Optionally, the end cap 420 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 420 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 410 to have higher structural strength and improved safety performance.

[0052] An electrode terminal 440 is provided on the end cap 420. The electrode terminal 440 can be used to electrically connect to the electrode assembly for outputting or inputting the electrical energy of the battery cell 410. In some embodiments, a pressure relief mechanism 450 for releasing the internal pressure when the internal pressure or temperature of the battery cell 410 reaches a threshold value can also be provided on the end cap 420.

[0053] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 410 reaches a predetermined threshold value. When the internal pressure or temperature of the battery cell 410 reaches a predetermined threshold value, the pressure relief mechanism 450 performs an action or a weak structure provided in the pressure relief mechanism 450 is damaged, thereby forming an opening or a channel for releasing the internal pressure or temperature. This threshold design varies according to different design requirements. The threshold value may depend on one or several of the materials of the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 410.

[0054] As an example, the pressure relief mechanism 450 can be integrally formed with the housing 430. For example, a notch is made on the housing 430 to form a weak structure, and this weak structure serves as the pressure relief mechanism 450.

[0055] The pressure relief mechanism 450 can also be separately provided and connected to the housing 430. For example, the pressure relief mechanism 450 is welded to the housing 430 or connected through other components. As an example, a notch is provided on the pressure relief mechanism 450 to form a weak structure.

[0056] As an example, the pressure relief mechanism 450 can be in the form of, for example, an explosion-proof valve, a balance valve, a gas valve, a pressure relief valve or a safety valve, etc.

[0057] As used in this application, "actuation" means that the pressure relief mechanism 450 generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 410 can be released. The actions generated by the pressure relief mechanism 450 may include, but are not limited to: the components in the pressure relief mechanism 450 move to form an exhaust passage, at least a part of the pressure relief mechanism 450 ruptures, breaks, is torn or opened, and so on. When the pressure relief mechanism 450 is actuated, the high-temperature and high-pressure substances inside the battery cell 410 will be discharged outward from the actuated part as emissions. In this way, the battery cell 410 can be depressurized and temperature-relieved under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0058] The outer shell 430 is a component used to cooperate with the end cap 420 to form the internal environment of the battery cell 410. Among them, the formed internal environment can be used to accommodate the electrode assembly, insulating film, electrolyte and other components. The outer shell 430 and the end cap 420 can be independent components. An opening can be provided on the outer shell 430, and the end cap 420 is covered at the opening to form the internal environment of the battery cell 410. Without limitation, the end cap 420 and the outer shell 430 can also be integrated. Specifically, the end cap 420 and the outer shell 430 can first form a common connection surface before other components enter the shell, and when the inside of the outer shell 430 needs to be encapsulated, the end cap 420 is then covered on the outer shell 430. The outer shell 430 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer shell 430 can be determined according to the specific shape and size of the electrode assembly. The material of the outer shell 430 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of this application do not make special restrictions on this.

[0059] The electrode assembly is a component in the battery cell 410 where an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charge and discharge process of the battery cell 410, the positive active substance and the negative active substance react with the electrolyte, and the electrode tabs are connected to the electrode terminals 440 to form an electric current loop.

[0060] Figure 4 It is a top view schematic diagram of the battery device provided by some embodiments of this application. Figure 5 is Figure 4 a cross-sectional view of the battery device provided by the illustrated embodiment along the A-A direction. Figure 6 is Figure 5The enlarged view of the cross-sectional view shown at B, refer to Figure 3 , Figure 5 and Figure 6 , the battery device 100 includes a box body 300, a battery cell assembly 400 and an adsorbing member 500. An accommodating space 330 is formed in the box body 300. The box body 300 has a top plate 340 and a bottom plate 350 oppositely arranged along its height direction Z. The accommodating space 330 is located between the top plate 340 and the bottom plate 350.

[0061] The battery cell assembly 400 is arranged in the accommodating space 330. The battery cell assembly 400 includes a plurality of battery cells 410 and a current collecting member. Each battery cell 410 includes an end cap 420, an electrode terminal 440 and a pressure relief mechanism 450. The end cap 420 faces the bottom plate 350. Both the electrode terminal 440 and the pressure relief mechanism 450 are arranged on the end cap 420. The current collecting member is electrically connected to the electrode terminals 440 of any two battery cells 410 among the plurality of battery cells 410. The adsorbing member 500 is arranged in the accommodating space 330 and is located between the battery cell assembly 400 and the bottom plate 350. The adsorbing member 500 is configured to adsorb the conductive substances ejected by the pressure relief mechanism 450 in the case of thermal runaway.

[0062] The bottom plate 350 can be part or all of the first part 310. The first part 310 can be made of a metal material or a non-metal material. The top plate 340 can be part or all of the second part 320. The second part 320 can be made of a metal material or a non-metal material. The bottom plate 350 is located at the bottom of the accommodating space 330, and the top plate 340 is located at the top of the accommodating space 330. The bottom plate 350 and the top plate 340 can be parallel to each other and arranged at intervals.

[0063] The plurality of battery cells 410 are arranged in a row along the first direction X. The first direction X can be the length direction or the width direction of the box body 300. The battery cells 410 can be fixedly connected to the first part 310 or the second part 320. The end cap 420 of the battery cell 410 is opposite to and spaced from the bottom plate 350. The electrode terminal 440 and the pressure relief mechanism 450 on the end cap 420 face the bottom plate 350. The current collecting member is welded to the surface of the electrode terminal 440 facing the bottom plate 350.

[0064] The adsorbing member 500 can be a plate-like structure made of porous materials such as absorbent cotton and activated carbon, or an adsorption coating applied to the inner surface of the bottom plate 350. The adsorbing member 500 is configured to adsorb the conductive substances ejected by the adsorption pressure relief mechanism 450, such as electrolytes, dissolved or split positive electrode plates, conductive additives, and the like. Among them, carbon black, conductive graphite, carbon fiber, carbon nanotubes, etc. are often used as conductive additives in the battery cell 410. These conductive substances are likely to adhere to the surfaces of the charged components such as the electrode terminals 440 and busbar components of the battery cell 410 after condensation, which will shorten the creepage distance between the charged components in the box body 300 and the box body 300, resulting in system insulation failure.

[0065] In the battery device 100 provided by the embodiment of the present application, by arranging the end cover 420 of the battery cell 410 and the pressure relief mechanism 450 facing the bottom plate 350, that is, by inverting the battery cell 410 in the box body 300, under the action of gravity, the conductive substances ejected by the thermal runaway of the pressure relief mechanism 450 fall onto the bottom plate 350 after condensation, reducing the possibility of falling onto the charged components such as the electrode terminals 440 and busbar components. At the same time, an adsorbing member 500 is provided between the battery cell assembly 400 and the bottom plate 350, which can adsorb the conductive substances on the adsorbing member 500, further reducing the probability of the conductive substances being adsorbed on the surface of the battery cell assembly 400, reducing the influence of the conductive substances on the creepage distance inside the box body 300, thereby reducing the risk of internal insulation failure of the box body 300 and improving the safety of the battery device 100.

[0066] In some embodiments, the adsorbing member 500 is arranged at intervals from the electrode terminals 440 and the busbar components. That is, the adsorbing member 500 has a spacing from the electrode terminals 440 in the height direction Z of the box body 300, and the two do not contact each other. The adsorbing member 500 has a spacing from the busbar components in the height direction Z of the box body 300, and the two do not contact each other.

[0067] The adsorbing member 500 generally has an initial state without adsorbing conductive substances and an expanded state after adsorbing conductive substances. The above-mentioned arrangement of the adsorbing member 500 at intervals from the electrode terminals 440 and the busbar components may mean that the adsorbing member 500 is arranged at intervals from the electrode terminals 440 and the busbar components in both the initial state and the expanded state.

[0068] By arranging the adsorbing member 500 at intervals from the electrode terminals 440 and the busbar components, the possibility that the adsorbing member 500 contacts the charged components such as the electrode terminals 440 and the busbar components after adsorbing conductive substances, thereby causing short circuits of these charged components, is reduced, and the safety of the battery device 100 is improved.

[0069] In some embodiments, the adsorbing member 500 is absorbent cotton.

[0070] The adsorption cotton can be fixed to the inner surface of the bottom plate 350. The adsorption cotton has a microporous sponge structure. This structure gives it an ultra-large specific surface area and efficient adsorption capacity. It can generally adsorb several to dozens of times its own weight of electrolyte and other conductive substances. When thermal runaway occurs, it can quickly adsorb the conductive substance to reduce the risk of leakage and spread. At the same time, the adsorption cotton is also chemically stable and can resist chemical corrosion from conductive substances such as electrolytes, maintaining the stability of its structure and performance. By utilizing the advantages of large adsorption capacity, fast adsorption, and strong chemical stability of the adsorption cotton, it can maximize the adsorption of conductive substances ejected after thermal runaway of the pressure relief mechanism 450, thereby minimizing the possibility of the conductive substance adhering to the battery cell assembly 400 after condensation.

[0071] The material of the adsorbent cotton mainly includes a main matrix and additives. The main matrix includes one or more of polypropylene and polyurethane, and the additives include one or more of flame retardants and antioxidants. Exemplarily, the adsorbent cotton can be made of polypropylene and a flame retardant. Alternatively, the adsorbent cotton can be made of polyurethane, a flame retardant and an antioxidant. Alternatively, the adsorbent cotton can be made of polypropylene, polyurethane, a flame retardant and an antioxidant. Polymer materials such as polypropylene or polyurethane have good adsorption properties and chemical stability, which can ensure that the adsorbent cotton has sufficient stability and durability when it comes into contact with the electrolyte. Flame retardants can enhance the fire resistance of the adsorbent cotton and prevent fire accidents caused by electrolyte leakage. Antioxidants can improve the aging resistance of the adsorbent cotton and extend its service life.

[0072] In some embodiments, the adsorbent 500 is a carbon nanocoating.

[0073] A carbon nanocoating can be applied to the inner surface of base plate 350. This coating has a high specific surface area. When carbon nanotubes come into contact with a conductive substance such as an electrolyte, their high specific surface area allows electrolyte molecules to be more widely distributed on the surface of the carbon nanocoating, thereby increasing the contact area between the electrolyte and adsorbent 500. Furthermore, the pore structure and surface chemical properties of the carbon nanocoating allow for physical adsorption with molecules in the electrolyte, effectively adsorbing the electrolyte. The carbon nanocoating's high specific surface area and physical adsorption properties maximize the adsorption of conductive substances ejected from pressure relief mechanism 450 following thermal runaway, minimizing the possibility of condensed conductive substances adhering to battery cell assembly 400.

[0074] The carbon nanotube coating may include silicate-based coatings and carbon nanotubes. The silicate-based coatings may be composite magnesium aluminum silicate coatings, rare earth thermal insulation coatings, etc. These materials can still maintain good stability and liquid absorption at high temperatures. Carbon nanotubes are added as additives to the silicate-based coatings. The diameter of the carbon nanotubes is only a few nanometers to dozens of nanometers, but the length can be up to several micrometers. This structure gives the carbon nanotubes an extremely high specific surface area. When the carbon nanotubes come into contact with the electrolyte, their high specific surface area enables the electrolyte molecules to be more widely distributed on the surface of the carbon nanotubes, thereby increasing the contact area between the electrolyte and the adsorption coating.

[0075] In some embodiments, the adsorbent 500 is a molecular sieve adsorbent.

[0076] The molecular sieve adsorbent can adsorb both the electrolyte and solid conductive substances such as positive electrode fragments and carbon materials, showing a good comprehensive adsorption effect. The main components of the molecular sieve adsorbent include aluminum silicate, silicate, metal cations, and auxiliary agents, etc. Aluminum silicate is one of the main components of the molecular sieve and constitutes the basic framework of the molecular sieve. Silicate is another important component in the molecular sieve and together with aluminum silicate constitutes the framework structure of the molecular sieve. The presence of silicate helps to enhance the thermal stability and mechanical strength of the molecular sieve. Metal cations include sodium ions, potassium ions, calcium ions, etc. These metal cations are introduced into the molecular sieve through ion exchange and can affect the pore size, charge distribution, and adsorption performance of the molecular sieve. Some auxiliary agents such as calcium oxide and sodium oxide may also be added to the molecular sieve adsorbent. These auxiliary agents can improve the physical and chemical properties of the molecular sieve or enhance its specific adsorption and separation capabilities.

[0077] In some embodiments, the material of the adsorbent 500 can also be aerogel, polymer, and permeable fiber materials such as non-woven fabric and filter paper. These materials have good adsorption capacity for the electrolyte.

[0078] In some embodiments, the bottom plate 350 can be made of non-metallic material. Exemplarily, the bottom plate 350 can be made of carbon fiber reinforced composite material, sheet molding compound, or long fiber thermoplastic.

[0079] The use of non-metallic material for the bottom plate 350 reduces the risk of insulation failure caused by the charged components on the battery cell assembly 400 being too close to the bottom plate 350. At the same time, the thermal conductivity of the non-metallic material is reduced, reducing the probability of condensation of the conductive substances ejected after the thermal runaway of the pressure relief mechanism 450.

[0080] In some embodiments, the box body 300 further includes a surrounding plate 360. The surrounding plate 360 surrounds the outer periphery of the bottom plate 350 and is connected to the bottom plate 350. One end of the battery cell 410 away from the end cover 420 is connected to the top plate 340, and the top plate 340 covers the side of the surrounding plate 360 away from the bottom plate 350.

[0081] The shape of the surrounding plate 360 is adapted to the bottom plate 350. Taking the bottom plate 350 as a rectangular plate as an example, the surrounding plate 360 can be a square-shaped structure formed by connecting four side plates end to end in sequence. The bottom plate 350 and the surrounding plate 360 are connected to each other to form the first part 310, and the bottom plate 350 and the surrounding plate 360 can be integrally formed.

[0082] One end of the battery cell 410 far from the end cap 420 can be adhesively fixed to the top plate 340 through structural adhesive. When assembling the battery device 100, the battery cell 410 can be first adhered to the top plate 340, and then the overall structure composed of the surrounding plate 360 and the bottom plate 350 is covered outside the battery cell 410 and connected to the top plate 340, improving the assembly convenience.

[0083] In some embodiments, the orthographic projection of each pressure relief mechanism 450 along the height direction Z and the orthographic projection of the adsorbent 500 along the height direction Z at least partially overlap.

[0084] In this way, in the height direction Z, the adsorbent 500 at least partially faces each pressure relief mechanism 450, and can more fully adsorb the conductive substances ejected by each pressure relief mechanism 450 during thermal runaway in the battery cell assembly 400.

[0085] In some embodiments, the orthographic projection of each pressure relief mechanism 450 along the height direction Z falls within the orthographic projection of the adsorbent 500 along the height direction X.

[0086] In this way, the adsorbent 500 can completely cover each pressure relief mechanism 450 in the height direction Z, and can adsorb as much as possible the conductive substances ejected by each pressure relief mechanism 450 during thermal runaway in the battery cell assembly 400.

[0087] Still referring to Figure 3 and Figure 6 , in some embodiments, a plurality of battery cells 410 are arranged in sequence along the first direction X, the adsorbent 500 includes a plurality of them, each adsorbent 500 extends along the first direction X, and the plurality of adsorbents 500 are arranged at intervals along the second direction Y. Among them, the first direction X, the second direction Y, and the height direction Z are perpendicular to each other in pairs.

[0088] The first direction X can be the length direction of the box body 300, and the second direction Y can be the width direction of the box body 300. Each adsorbent 500 is a strip-shaped structure extending along the first direction X. Among the plurality of adsorbents 500, one adsorbent 500 can face all the pressure relief mechanisms 450 in a column of battery cells 410, that is, the orthographic projections of all the pressure relief mechanisms 450 in a column of battery cells 410 along the height direction Z all fall within the orthographic projection of this adsorbent 500 along the height direction X.

[0089] In the above embodiments, a plurality of adsorbing members 500 are provided, which can flexibly adapt to the complex space inside the box body 300, so that the conductive substances in each area can be effectively adsorbed as much as possible. At the same time, the adsorbing members 500 include a plurality of dispersed ones, which are easy to arrange and replace, and are convenient for quick replacement after the battery device 100 is maintained or a thermal runaway occurs.

[0090] Figure 7 FIG. 5 is a top view structural schematic diagram of the adsorbing member 500 and the bottom plate 350 in the battery device 100 disclosed in another embodiment of the present application. Please refer to Figure 3 、 Figure 6 and Figure 7 , in some embodiments, a plurality of battery cells 410 are arranged in sequence along the first direction X, and the size of the adsorbing member 500 along the first direction X is greater than or equal to the size of the battery cell assembly 400 along the first direction X. Wherein, the first direction X and the height direction Z are perpendicular to each other.

[0091] The first direction X may be the length direction of the box body 300, and the adsorbing member 500 may be a strip-shaped or plate-shaped structure extending along the first direction X. By setting the size of the adsorbing member 500 along the first direction X to be greater than or equal to the size of the battery cell assembly 400 along the first direction X, the adsorbing member 500 can extend below each battery cell 410 in the battery cell assembly 400 in the first direction X, increasing the area of the adsorbing member 500 to adsorb the conductive substances ejected in the case of thermal runaway of the battery cell assembly 400 as much as possible.

[0092] In some embodiments, a plurality of battery cells 410 are arranged in sequence along the first direction X, and the size of the adsorbing member 500 along the second direction Y is greater than or equal to the size of the battery cell assembly 400 along the second direction Y, wherein the first direction X, the second direction Y and the height direction Z are perpendicular to each other in pairs.

[0093] The first direction X may be the length direction of the box body 300, and the second direction Y may be the width direction of the box body 300. The adsorbing member 500 may be a strip-shaped or plate-shaped structure extending along the second direction Y. By setting the size of the adsorbing member 500 along the second direction Y to be greater than or equal to the size of the battery cell assembly 400 along the second direction Y, the adsorbing member 500 can extend below the entire battery cell 410 in the second direction Y, increasing the area of the adsorbing member 500 to adsorb the conductive substances ejected in the case of thermal runaway of the pressure relief mechanism 450 as much as possible.

[0094] In some embodiments, the plurality of battery cells 410 are arranged sequentially along a first direction X. The size of the adsorbent 500 along the first direction X is greater than or equal to the size of the battery cell assembly 400 along the first direction X. The size of the adsorbent 500 along the second direction Y is greater than or equal to the size of the battery cell assembly 400 along the second direction Y. The first direction X, the second direction Y, and the height direction Z are all perpendicular to each other.

[0095] The first direction X may be the length direction of the box 300, and the second direction Y may be the width direction of the box 300. The adsorption member 500 is a flat plate structure extending along the first direction X and the second direction Y. The adsorption member 500 may completely cover the inner surface of the bottom plate 350 exposed in the receiving space 330.

[0096] In the above embodiment, the adsorption member 500 can cover the entire battery cell assembly 400 in the height direction Z, so that the area of the adsorption member 500 is maximized, thereby maximizing the adsorption of conductive substances ejected in the event of thermal runaway of the battery cell assembly 400 .

[0097] Figure 8 This is a schematic diagram of the top view of the adsorption member and the bottom plate in the battery device disclosed in another embodiment of the present application. Figure 3 、 Figure 6 and Figure 8 In some embodiments, the surface of the adsorption member 500 facing the battery cell 410 is concave to form a receiving groove 510 .

[0098] The receiving groove 510 may be a honeycomb-shaped groove, a circular groove, an elliptical groove, etc. The opening of the receiving groove 510 faces the battery cell 410. The opening area of the receiving groove 510 may be greater than or equal to the area of the pressure relief mechanism 450. The orthographic projection of the pressure relief mechanism 450 in the height direction Z may fall within the orthographic projection of the receiving groove 510 in the height direction Z, so that the pressure relief mechanism 450 can directly face the receiving groove 510.

[0099] The groove wall of the accommodating groove 510 can play a certain limiting role, reducing the sputtering range of the conductive material ejected by the pressure relief mechanism 450 due to thermal runaway, thereby adsorbing and fixing the conductive material on the adsorption member 500 as much as possible.

[0100] In some embodiments, the number of the receiving slots 510 includes multiple receiving slots 510, and the multiple receiving slots 510 are arranged in an array.

[0101] For example, in Figure 3 In the embodiment shown, when there are multiple adsorption members 500, one or more of the adsorption members 500 are provided with array-arranged receiving grooves 510. Figure 7 In the illustrated embodiment, the entire adsorption member 500 is provided with receiving grooves 510 arranged in an array.

[0102] By using the accommodating grooves 510 arranged in an array, the adsorption area of the adsorbing member 500 can be enlarged to maximize the adsorption of the conductive substances ejected in the case of thermal runaway of the adsorption and pressure relief mechanism 450.

[0103] An embodiment of the present application further provides an electrical device, including the battery device 100 of the above embodiment, and the battery device 100 is used to provide electrical energy.

[0104] Please refer to Figures 2 to 8 , an embodiment of the present application provides a battery device 100, including a box body 300, a battery cell assembly 400 and an adsorbing member 500. An accommodating space 330 is formed in the box body 300, and the box body 300 has a top plate 340 and a bottom plate 350 oppositely arranged along its height direction Z. The battery cell assembly 400 is arranged in the accommodating space 330, and the battery cell assembly 400 includes a busbar member and a plurality of battery cells 410 arranged along a first direction X. Each battery cell 410 includes an end cap 420, an electrode terminal 440 and a pressure relief mechanism 450. The end cap 420 of the battery cell 410 faces the bottom plate 350, the electrode terminal 440 and the pressure relief mechanism 450 are arranged on the end cap 420, and one end of the battery cell 410 away from the end cap 420 is fixed on the top plate 340. The busbar member is electrically connected to the electrode terminals 440 of any two battery cells 410 among the plurality of battery cells 410. The adsorbing member 500 is an adsorption cotton or a carbon nano-coating or a molecular sieve adsorbent. The adsorbing member 500 is arranged in the accommodating space 330 and is located between the battery cell assembly 400 and the bottom plate 350. The adsorbing member 500 is spaced apart from the electrode terminals 440 and the busbar member, and the adsorbing member 500 is configured to adsorb the conductive substances ejected by the pressure relief mechanism 450 in the case of thermal runaway.

[0105] As an example, the adsorbing member 500 is in a plate-like structure, and the adsorbing member 500 covers the entire inner surface of the bottom plate 350.

[0106] As an example, the adsorbing member 500 is in a plate-like structure, the adsorbing member 500 covers the entire inner surface of the bottom plate 350, and a plurality of accommodating grooves 510 are formed by concave-convex on the surface of the adsorbing member 500 facing the battery cell 410, and the plurality of accommodating grooves 510 are arranged in an array.

[0107] As an example, the adsorbing member 500 is in a strip-like structure, the adsorbing member 500 includes a plurality of them, each adsorbing member 500 extends along the first direction X, and the plurality of adsorbing members 500 are arranged at intervals along a second direction Y, wherein the first direction X, the second direction Y and the height direction Z are perpendicular to each other in pairs.

[0108] Although the present application has been described with reference to preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A box body, an accommodation space is formed inside the box body, the box body has a top plate and a bottom plate oppositely arranged along its height direction, and the accommodation space is located between the top plate and the bottom plate; A battery cell assembly, arranged in the accommodation space, the battery cell assembly includes a plurality of battery cells and a busbar component, the battery cell includes an end cap, an electrode terminal and a pressure relief mechanism, the end cap faces the bottom plate, and both the electrode terminal and the pressure relief mechanism are arranged on the end cap, and the busbar component is electrically connected to the electrode terminals of any two of the plurality of battery cells; And An adsorbent, the adsorbent is arranged in the accommodation space and is located between the battery cell assembly and the bottom plate, and the adsorbent is configured to adsorb the conductive substances ejected by the pressure relief mechanism in the case of thermal runaway.

2. The battery device according to claim 1, wherein The orthographic projection of each of the pressure relief mechanisms along the height direction at least partially overlaps with the orthographic projection of the adsorbent along the height direction.

3. The battery device according to claim 2, characterized in that, The orthographic projection of each of the pressure relief mechanisms along the height direction falls within the orthographic projection of the adsorbent along the height direction.

4. The battery device according to claim 1, wherein A receiving groove is formed by concaveing the surface of the adsorbent facing the battery cell.

5. The battery device according to claim 4, characterized in that, The number of the receiving grooves includes a plurality, and the plurality of receiving grooves are arranged in an array.

6. The battery device according to claim 1, characterized in that, The plurality of battery cells are arranged in sequence along a first direction, the adsorbent includes a plurality, each adsorbent extends along the first direction, and the plurality of adsorbents are arranged at intervals along a second direction, wherein the first direction, the second direction and the height direction are perpendicular to each other in pairs.

7. The battery device according to claim 1, characterized in that, The plurality of battery cells are arranged in sequence along a first direction, the size of the adsorbent along the first direction is greater than or equal to the size of the battery cell assembly along the first direction, wherein the first direction and the height direction are perpendicular to each other; and / or, The plurality of battery cells are arranged in sequence along a first direction, the size of the adsorbent along a second direction is greater than or equal to the size of the battery cell assembly along the second direction, wherein the first direction, the second direction and the height direction are perpendicular to each other in pairs.

8. The battery device according to any one of claims 1 to 7, characterized in that, The adsorbent is spaced apart from the electrode terminal and the busbar component.

9. The battery device according to any one of claims 1 to 7, characterized in that, The adsorbent is an adsorption cotton, a carbon nano-coating or a molecular sieve adsorbent.

10. The battery device according to any one of claims 1 to 7, characterized in that, The bottom plate is made of a non-metallic material.

11. The battery device according to any one of claims 1 to 7, characterized in that, The box body further includes a surrounding plate, the surrounding plate surrounds the outer periphery of the bottom plate and is connected to the bottom plate, one end of the battery cell away from the end cap is connected to the top plate, and the top plate covers the side of the surrounding plate away from the bottom plate.

12. An electrical device, characterized in that, Including the battery device according to any one of claims 1 to 11, the battery device is used for providing electric energy.

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