Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries, and the battery device comprises a battery monomer assembly and a protection plate. The protection plate is arranged on at least one side of the battery monomer assembly, an accommodating cavity is formed in the protection plate, and a non-Newtonian fluid and a self-repairing material are arranged in the accommodating cavity. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] How to improve the reliability of battery devices is an urgent problem to be solved in battery technology. Summary of the Utility Model

[0004] The embodiments of the present application provide a battery device and an electrical device, which can improve the reliability during the use of the battery device.

[0005] In a first aspect, the embodiments of the present application provide a battery device, including a battery cell assembly and a protection plate. The protection plate is disposed on at least one side of the battery cell assembly. The protection plate has a receiving cavity therein, and a non-Newtonian fluid and a self-healing material are disposed in the receiving cavity.

[0006] In the above technical solution, by disposing the protection plate on at least one side of the battery cell assembly and arranging the non-Newtonian fluid and the self-healing material in the receiving cavity of the protection plate, on the one hand, when the side of the battery cell assembly provided with the protection plate is subjected to an external impact force, the non-Newtonian fluid can quickly harden, so as to endow the protection plate with good anti-impact performance to protect the battery cell assembly, thereby improving the reliability of the battery device; on the other hand, when the protection plate is damaged due to a large external impact force, the self-healing material can repair the damaged part to reduce the risk of continuous leakage of the non-Newtonian fluid from the damaged part, thereby reducing the risk of reduction in the anti-impact performance of the protection plate caused by continuous leakage of the non-Newtonian fluid, thereby improving the reliability of the battery device.

[0007] In some embodiments, a partition wall is disposed in the protection plate, and the partition wall divides the receiving cavity into a plurality of sub-cavities, and the non-Newtonian fluid and the self-healing material are disposed in each sub-cavity.

[0008] In the above technical solution, the accommodation cavity is divided into a plurality of sub-cavities by a partition wall, and a non-Newtonian fluid and a self-healing material are arranged in each sub-cavity. Thus, the flow of the non-Newtonian fluid is restricted by the partition wall. When the protection plate is damaged due to a large external impact force, the flow rate of the non-Newtonian fluid in the accommodation cavity flowing towards the damaged part is reduced, so as to reduce the volume of the non-Newtonian fluid leaking when the protection plate is damaged, and further reduce the risk of the reduction of the impact resistance of the protection plate caused by the continuous leakage of the non-Newtonian fluid, thereby further improving the reliability of the battery device.

[0009] In some embodiments, the protection plate includes a first wall and a second wall oppositely arranged along its thickness direction, the partition wall is arranged between the first wall and the second wall, and connects the first wall and the second wall.

[0010] In the above technical solution, by arranging the partition wall between the first wall and the second wall and connecting the first wall and the second wall, when one of the first wall and the second wall bears an external impact force along the thickness direction of the protection plate, the partition wall can transmit the external impact force to the other of the first wall and the second wall, so that the first wall and the second wall jointly bear the external impact force, improving the overall impact resistance of the protection plate, and thus improving the reliability of the battery device.

[0011] In some embodiments, the first wall includes a first body portion and a first edge portion surrounding the first body portion; the second wall includes a second body portion and a second edge portion surrounding the second body portion; the first edge portion is connected to the second edge portion, and the partition wall connects the first body portion and the second body portion.

[0012] In the above technical solution, through the first edge portion and the second edge portion, the first wall and the second wall are connected, and the first body portion, the first edge portion, the second body portion and the second edge portion jointly enclose to form the accommodation cavity, with a simple structure and easy to implement.

[0013] In some embodiments, the partition wall is integrally formed with the first wall, or the partition wall is integrally formed with the second wall.

[0014] In the above technical solution, by integrally forming the first wall or the second wall with the partition wall, the structural strength at the connection between the first wall or the second wall and the partition wall is better, reducing the risk of detachment at the connection between the first wall or the second wall and the partition wall. At the same time, the number of parts of the protection plate is reduced, thus simplifying the assembly of the partition wall and facilitating the improvement of the production efficiency of the battery device.

[0015] In some embodiments, the first wall is a fiber resin part, and / or the second wall is a fiber resin part, and / or the partition wall is a fiber resin part.

[0016] In the above technical solution, by setting one or more of the first wall, the second wall, and the partition wall as fiber resin parts, part or the whole of the protective plate has good corrosion resistance, reducing the risk of part or the whole of the protective plate being damaged due to corrosion, and improving the reliability of the battery device. At the same time, fiber resin has a lower density than metal materials. Using fiber resin parts as part or the whole of the protective plate helps to reduce the weight of the protective plate, and thus reduces the weight of the battery device.

[0017] In some embodiments, the cross-section of the sub-cavity perpendicular to the thickness direction of the protective plate is polygonal.

[0018] In the above technical solution, by setting the cross-section of the sub-cavity perpendicular to the thickness direction of the protective plate as polygonal, any point on the two opposite wall parts of the protective plate in its thickness direction is directly supported by the partition wall, or a partition wall is disposed around the periphery of any point on the two opposite wall parts of the protective plate in its thickness direction, thereby reducing the deformation of any point on the two opposite wall parts of the protective plate in its thickness direction when bearing an external impact force, thus reducing the risk of the protective plate being damaged and improving the reliability of the battery device.

[0019] In some embodiments, the plurality of sub-cavities are arranged in a honeycomb pattern.

[0020] In the above technical solution, by arranging the plurality of sub-cavities in a honeycomb pattern, when the protective plate bears an external impact force, the partition wall can disperse the impact force more evenly, reducing the risk of the protective plate being damaged and improving the reliability of the battery device. At the same time, the honeycomb structure can be seamlessly spliced in the cross-section of the protective plate perpendicular to its thickness direction, and in the same volume, the surface area of the honeycomb structure is the smallest and the material usage is the lowest, which is beneficial to reducing the weight of the protective plate, and thus reducing the weight of the battery device.

[0021] In some embodiments, the plurality of sub-cavities are isolated from each other.

[0022] In the above technical solution, by isolating the plurality of sub-cavities from each other, when the protective plate is damaged due to a large external impact force, only the non-Newtonian fluid in the damaged sub-cavity leaks, thereby further reducing the volume of the non-Newtonian fluid leaking when the protective plate is damaged, and further reducing the risk of the anti-impact performance of the protective plate being reduced due to the continuous leakage of the non-Newtonian fluid, thus further improving the reliability of the battery device.

[0023] In some embodiments, along the direction of gravity, the protective plate is disposed at the bottom of the battery cell assembly, and the thickness direction of the protective plate is parallel to the direction of gravity.

[0024] In the above technical solution, the protective plate is disposed at the bottom of the battery cell assembly, and the thickness direction of the protective plate is parallel to the direction of gravity, so that under the action of gravity, the non-Newtonian fluid can be more evenly distributed in the accommodating cavity. Therefore, when the protective plate bears an external impact force, the non-Newtonian fluid can more evenly disperse the external impact force to the entire protective plate, thereby reducing the risk of buffer failure caused by local stress concentration and improving the reliability of the battery device.

[0025] In some embodiments, the battery device further includes a box body; the box body is used to accommodate the battery cell assembly, and the box body has a bottom wall for carrying the battery cell assembly; the protective plate is disposed on a side of the bottom wall facing away from the battery cell assembly.

[0026] In the above technical solution, the protective plate is disposed on a side of the bottom wall facing away from the battery cell assembly. Thus, when the protective plate is damaged and the non-Newtonian fluid leaks, the risk of the non-Newtonian fluid affecting the operation of the battery cell assembly is reduced, and the reliability of the battery device is improved.

[0027] In a second aspect, an embodiment of the present application provides an electrical device, including the battery device provided in any embodiment of the first aspect, and the battery device is used to provide electrical energy.

[0028] In the above technical solution, the battery device provided in any embodiment of the first aspect has high safety performance and energy density, so that the electrical device powered by the battery device has high electrical safety and electrical reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0031] Figure 2 An exploded structural view of a battery device provided in some embodiments of the present application;

[0032] Figure 3 An exploded structural view of a battery cell provided in some embodiments of the present application;

[0033] Figure 4 A cross-sectional view of a protective plate provided in some embodiments of the present application;

[0034] Figure 5Explosion diagram of the structure of the protection plate provided by some embodiments of the present application;

[0035] Figure 6 Explosion diagram of the structure of the protection plate provided by other embodiments of the present application;

[0036] Figure 7 Explosion diagram of the structure of the protection plate provided by still other embodiments of the present application.

[0037] Icons: 1000 - vehicle; 100 - battery device; 10 - box body; 11 - first box body; 12 - second box body; 121 - bottom wall; 20 - battery cell assembly; 21 - battery cell; 211 - end cover; 212 - housing; 213 - electrode assembly; 30 - protection plate; 31 - first wall; 311 - first body part; 312 - first edge part; 313 - first connection part; 32 - second wall; 321 - second body part; 322 - second edge part; 323 - second connection part; 301 - accommodation cavity; 301A - sub - cavity; 33 - partition wall; 200 - controller; 300 - motor; X - length direction; Y - width direction; Z - thickness direction. Detailed implementation manners

[0038] 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 fall within the scope of protection of the present application.

[0039] 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 - mentioned 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 - mentioned drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0040] Referring to "embodiments" in the present application means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in 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. < provin="">

[0041] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "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 components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] The term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device are only illustrative and should not constitute any limitation to the present application.

[0044] The term "a plurality of" as used in the present application refers to two or more (including two).

[0045] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0046] The battery cell includes but is not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0047] In the related art, the battery cell generally includes a housing and an electrode assembly. The housing can include a casing and an end cap. The casing has an opening. After the electrode assembly is installed in the casing, the opening of the casing can be closed by the end cap to form a sealed space for accommodating the electrode assembly inside the housing.

[0048] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and allow active ions to pass through at the same time.

[0049] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0050] In some embodiments, the electrode assembly has a laminated structure.

[0051] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, or the like.

[0052] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0053] The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0054] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0055] The battery apparatus mentioned in the embodiments 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 series-parallel combination through a current collecting component.

[0056] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0057] In some embodiments, the battery device can 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.

[0058] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0059] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0060] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0061] In some embodiments, the battery device may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] The following will mainly focus on the cuboid battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, soft-pack battery cells, or blade battery cells in some aspects.

[0063] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered.

[0064] In order to improve the reliability of the battery device, a protection plate is generally provided on one side of the components of the battery cell. The protection plate is used to absorb external impact forces when the battery device is impacted by external forces, so as to reduce the risk of external forces damaging the battery cell components. At the same time, for the lightweight of the battery device, the protection plate is made of a hollow structure filled with non-Newtonian fluid. However, if the protection plate is damaged under external impact, the non-Newtonian fluid will leak from the damaged part, thereby reducing the impact resistance of the protection plate.

[0065] Based on the above considerations, in order to improve the reliability of the battery device, an embodiment of the present application provides a battery device, including a battery cell component and a protection plate. The protection plate is disposed on at least one side of the battery cell component, and the protection plate has an accommodation cavity, and a non-Newtonian fluid and a self-healing material are disposed in the accommodation cavity.

[0066] In this battery device, by disposing the protection plate on at least one side of the battery cell component and arranging a non-Newtonian fluid and a self-healing material in the accommodation cavity of the protection plate, on the one hand, when the side of the battery cell component provided with the protection plate is subjected to an external impact force, the non-Newtonian fluid can quickly harden, so as to endow the protection plate with good impact resistance to protect the battery cell component, thereby improving the reliability of the battery device; on the other hand, when the protection plate is damaged due to a large external impact force, the self-healing material can repair the damaged part to reduce the risk of continuous leakage of the non-Newtonian fluid from the damaged part, thereby reducing the risk of reduction in the impact resistance of the protection plate caused by continuous leakage of the non-Newtonian fluid, thereby improving the reliability of the battery device.

[0067] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0068] The electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0069] Please refer to Figure 1 , Figure 1 FIG. 1000 is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. 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, or an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as an operating power source or a power source for use of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0070] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source or a power source for use of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0071] Please refer to Figure 2 and Figure 3 and please refer to Figure 4 , Figure 2 FIG. 100 is a schematic structural diagram of a battery device 100 provided in some embodiments of the present application, Figure 3 FIG. 20 is an exploded view of the structure of a battery cell assembly 20 provided in some embodiments of the present application, Figure 4 FIG. 30 is a cross-sectional view of a protective plate 30 provided in some embodiments of the present application. Some embodiments of the present application provide a battery device 100, including a battery cell assembly 20 and a protective plate 30. The protective plate 30 is disposed on at least one side of the battery cell assembly 20. The protective plate 30 has a receiving cavity 301 therein, and a non-Newtonian fluid and a self-healing material are disposed in the receiving cavity 301.

[0072] The battery cell 21 generally includes a housing and an electrode assembly 213. The housing may include a housing body 212 and an end cap 211. The housing body 212 has an opening. After the electrode assembly 213 is installed in the housing body 212, the opening of the housing body 212 can be closed by the end cap 211 to form a sealed space for accommodating the electrode assembly 213 inside the housing.

[0073] To meet different power demand for use, the battery device 100 may include a plurality of battery cells 21. Among them, the plurality of battery cells 21 may be connected in series, in parallel or in a combined series-parallel connection. The combined series-parallel connection means a combination of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, the plurality of battery cells 21 may first be connected in series, in parallel or in a combined series-parallel connection to form a battery cell assembly 20, and then a plurality of battery cell assemblies 20 are connected in series, in parallel or in a combined series-parallel connection to form the battery device 100. That is to say, the plurality of battery cells 21 may directly form the battery device 100, or may first form the battery cell assembly 20, and then the battery cell assembly 20 forms the battery device 100.

[0074] According to different power demands, the number of battery cells 21 in the battery cell assembly 20 may be set to any value. The plurality of battery cells 21 can be connected in series, in parallel or in a combined series-parallel connection to achieve a larger capacity or power. Since the number of battery cells 21 included in each battery device 100 may be relatively large, for the convenience of installation, the battery cells 21 can be grouped, and each group of battery cells 21 forms a battery cell assembly 20. The number of battery cells 21 included in the battery cell assembly 20 is not limited and can be set according to requirements. The battery device 100 may include a plurality of battery cell assemblies 20, and these battery cell assemblies 20 can be connected in series, in parallel or in a combined series-parallel connection.

[0075] The protection plate 30 is a plate-like structure in the battery device 100 for absorbing external impact force.

[0076] "The protection plate 30 is disposed on at least one side of the battery cell assembly 20" can be understood as that the protection plate 30 is located outside one side of the battery cell assembly 20, or the protection plate 30 is located outside multiple sides of the battery cell assembly 20.

[0077] In some embodiments, one side of the protection plate 30 facing the battery cell assembly 20 is recessed to form a receiving groove, and at least part of the battery cell assembly 20 and other structural members of the battery device 100 are received in the receiving groove.

[0078] In some embodiments, there are a plurality of protection plates 30, and the plurality of protection plates 30 are wound around the outer periphery of the battery cell assembly 20.

[0079] The accommodation cavity 301 is the cavity inside the protection plate 30. Exemplarily, the protection plate 30 can be an integrally formed plate body that forms the accommodation cavity 301, or the protection plate 30 can be a split structure, and the components of the protection plate 30 jointly enclose to form the accommodation cavity 301.

[0080] A non-Newtonian fluid refers to a fluid that does not satisfy Newton's viscosity experimental law, that is, a fluid in which the shear stress and the shear strain rate are not linearly related.

[0081] When the non-Newtonian fluid material is not subjected to an external pressure, the movement between its internal molecules is relatively open, the molecules are weakly connected, and the molecules inside the material can move freely. At this time, it will show relatively soft, bendable, and deformable external characteristics. On the contrary, when the non-Newtonian fluid material undergoes a sharp deformation due to an external pressure, the originally loose molecules will be concentrated due to the change in external force (shear thickening), and the connection force between the molecules will also increase accordingly. At this time, the external performance of the material will "transform from soft to rigid", and the greater the impact force, the stronger the connection force between the molecules, so that the material has a protective function and reflects extremely strong protective value.

[0082] Specifically, when an impact force acts on the accommodation cavity 301, the non-Newtonian fluid (will be instantaneously subjected to a high shear rate, the viscosity will increase sharply, and it will change from "liquid state" to "quasi-solid state", so as to absorb and dissipate a large amount of kinetic energy.

[0083] Exemplarily, the non-Newtonian fluid material includes one or more of P4U, ESA, ACF, and D30.

[0084] It should be noted that the full English name of the P4U material is Protection For You, which is a kind of intelligent material. This P4U intelligent material is a non-Newtonian fluid substance, maintaining a relaxed state under normal conditions, soft and elastic. Once subjected to severe collision or impact, the molecules immediately lock with each other, quickly tighten and harden to absorb the external force, forming a protective layer. When the external force disappears, the material will return to its original relaxed, soft and elastic state. Thus, it can make different responses to different impact situations instantaneously. ESA is a new type of intelligent impact energy-absorbing material. Under normal conditions, the shear thickening material (shear thickening liquid, gel and intelligent energy-absorbing material) is very soft. Once encountering high-speed collision or extrusion, the material becomes hard to absorb the external force. ACF is the ACF artificial cartilage bionic material, and its full English name is Artificial Cartilage Foam. This material usually shows softness and absorbs energy due to the flow of molecules at the moment of being impacted, thus playing a role in buffering, shock absorption and energy absorption. The D3O material is a kind of intelligent material composed of non-Newtonian fluid substances similar to the P4U material, a material synthesized by viscous fluid and polymer, with the special property of "strain rate sensitivity". Under normal conditions, the connection force between molecules in the material is very weak and can move freely. Therefore, the material is soft and bendable. When suddenly impacted by an external force and deformed, it will cause the connection force between molecules in the material to increase, making the material become hard and absorb the impact energy. Thus, by using the above-mentioned filling materials, the non-Newtonian fluid material can better ensure the stability of the battery cell placed therein.

[0085] It can be understood that the non-Newtonian fluid material includes, but is not limited to, one or several of P4U, ESA, ACF and D3O. Of course, other similar filling materials can also be used for the non-Newtonian fluid to achieve the same above-mentioned effect, which will not be elaborated here.

[0086] The self-healing material is a new type of material that can self-repair when the object is damaged. This material is injected into the accommodating cavity 301. When the object cracks, the injected material will be released to automatically repair the damaged surface of the object.

[0087] It can be understood that the self-healing material should adopt a material that does not chemically react with the non-Newtonian fluid material, and the self-healing material should be physically mixed with the non-Newtonian fluid.

[0088] Specifically, when the protective plate 30 is damaged and the non-Newtonian fluid leaks, the self-healing material reacts with the components in the air to solidify, thereby sealing the damaged part, or a part of the self-healing material mixes with another part of the self-healing material to react and solidify, thereby sealing the damaged part.

[0089] Exemplarily, the self-healing material includes one or more of polystyrene foam, polyurethane foam, polypropylene foam, polyvinyl chloride foam, polyacrylate, rapid-curing silica gel, two-component polyurethane, and epoxy resin.

[0090] It should be noted that for polystyrene foam (EPS), microcapsules are embedded in the closed-cell structure of the polystyrene foam, and polymer monomers (such as epoxy resin or polyurethane prepolymer) are encapsulated inside the capsules. When the foam is damaged due to impact or compression, the microcapsules rupture to release the repair agent, and the polymerization reaction is triggered by heating or a catalyst to fill the holes. For polyurethane foam (PU), a photosensitive monomer (such as acrylate) can be incorporated into the polyurethane, and the polymerization reaction is initiated by ultraviolet irradiation to repair the damaged part. For polypropylene foam (PP), a thermoplastic elastomer (such as thermoplastic vulcanizate) is introduced into the polypropylene, and a reversible cross-linked network is formed through dynamic vulcanization to achieve multiple repairs. For polyvinyl chloride foam (PVC), an ionic liquid can be incorporated into the polyvinyl chloride, and when damaged, the ions migrate to the damaged part, and the structure is reorganized through electrostatic interaction or coordination bonds. Polyacrylate and water can be accommodated in two types of microcapsules respectively. When the impact force causes the protective plate 30 to be damaged and the two types of microcapsules containing polyacrylate and water are damaged, the polyacrylate can quickly absorb and expand to block the damaged part. The rapid-curing silica gel can quickly cross-link and react with air to solidify, so as to block the damaged part. The two-component polyurethane and epoxy resin are accommodated in two types of microcapsules. When the impact force causes the protective plate 30 to be damaged and the two types of microcapsules containing the two-component polyurethane and epoxy resin are damaged, the two-component polyurethane and epoxy resin can quickly react and expand and solidify to block the damaged part.

[0091] It can be understood that the self-healing material includes, but is not limited to, one or several of polystyrene foam, polyurethane foam, polypropylene foam, polyvinyl chloride foam, polyacrylate, rapid-curing silica gel, two-component polyurethane, and epoxy resin. Of course, other similar filling materials can also be used for the self-healing material to achieve the same above-mentioned effect, which will not be elaborated here.

[0092] In this embodiment, by disposing the protective plate 30 on at least one side of the battery cell assembly 20 and arranging a non-Newtonian fluid and a self-healing material in the accommodating cavity 301 of the protective plate 30, on the one hand, when the side of the battery cell assembly 20 provided with the protective plate 30 is subjected to an external impact force, the non-Newtonian fluid can quickly harden, so as to endow the protective plate 30 with good impact resistance to protect the battery cell assembly 20, thereby improving the reliability of the battery device 100; on the other hand, when the protective plate 30 is damaged due to a large external impact force, the self-healing material can repair the damaged part to reduce the risk of the non-Newtonian fluid continuously leaking from the damaged part, thereby reducing the risk of the impact resistance of the protective plate 30 decreasing due to the continuous leakage of the non-Newtonian fluid, thereby improving the reliability of the battery device 100.

[0093] According to some embodiments of the present application, please refer to Figures 5 - 7 , Figures 5 - 7 FIG. 6 is an exploded view of the structure of three protection plates 30 provided in some embodiments of the present application. A partition wall 33 is provided in the protection plate 30, and the partition wall 33 divides the accommodation cavity 301 into a plurality of sub-cavities 301A. A non-Newtonian fluid and a self-healing material are provided in each sub-cavity 301A.

[0094] The partition wall 33 is a wall portion provided in the accommodation cavity 301 to divide the accommodation cavity 301 into a plurality of sub-cavities 301A.

[0095] In some embodiments, the protection plate 30 includes a first wall 31 and a second wall 32 oppositely disposed along its thickness direction Z. The partition wall 33 is provided between the first wall 31 and the second wall 32 and is connected to one of the first wall 31 and the second wall 32.

[0096] In some embodiments, please refer to Figure 5 , the partition wall 33 extends along the length direction X of the protection plate 30, and both ends of the partition wall 33 are respectively connected to the wall portion of the accommodation cavity 301 to divide the accommodation cavity 301 into a plurality of sub-cavities 301A arranged along the width direction Y of the protection plate 30; or, the partition wall 33 extends along the width direction Y of the protection plate 30, and both ends of the partition wall 33 are respectively connected to the wall portion of the accommodation cavity 301 to divide the accommodation cavity 301 into a plurality of sub-cavities 301A arranged along the length direction X of the protection plate 30.

[0097] It should be noted that "the partition wall 33 extends along the length direction X of the protection plate 30" may mean that the partition wall 33 extends along a straight line, and this straight line is parallel to the length direction X of the protection plate 30; or it may mean that the partition wall 33 extends along a curve or a broken line, and the overall extension direction of this curve or broken line is parallel to the length direction X of the protection plate 30.

[0098] In some embodiments, please refer to Figure 6 , part of the partition wall 33 extends along the length direction X of the protection plate 30, and another part of the partition wall 33 extends along the width direction Y of the protection plate 30, so as to divide the accommodation cavity 301 into multiple columns of sub-cavities 301A arranged along the length direction X of the protection plate 30, and each column of sub-cavities 301A includes a plurality of sub-cavities 301A arranged along the width direction Y of the protection plate 30.

[0099] In this embodiment, the accommodating chamber 301 is divided into a plurality of sub-cavities 301A by a partition wall 33, and a non-Newtonian fluid and a self-healing material are provided in each sub-cavity 301A, so that the flow of the non-Newtonian fluid is restricted by the partition wall 33. When the protective plate 30 is damaged due to a large external impact force, the flow rate of the non-Newtonian fluid in the accommodating chamber 301 toward the damaged part is reduced, thereby reducing the volume of the non-Newtonian fluid leaked when the protective plate 30 is damaged, further reducing the risk of reduced impact resistance of the protective plate 30 due to continuous leakage of the non-Newtonian fluid, thereby further improving the reliability of the battery device 100.

[0100] According to some embodiments of this application, please refer to Figures 5 - 7 The protective plate 30 includes a first wall 31 and a second wall 32 that are oppositely arranged along the thickness direction Z thereof. The partition wall 33 is arranged between the first wall 31 and the second wall 32 and connects the first wall 31 and the second wall 32 .

[0101] The first wall 31 and the second wall 32 are two wall portions of the protection plate 30 that are opposite to each other in the thickness direction Z thereof.

[0102] In some embodiments, the first wall 31 is a wall portion of the protective plate 30 facing the battery cell assembly 20 along the thickness direction Z thereof, and the second wall 32 is a wall portion of the protective plate 30 facing away from the battery cell assembly 20 along the thickness direction Z thereof.

[0103] In some embodiments, the second wall 32 is a wall portion of the protective plate 30 facing the battery cell assembly 20 along the thickness direction Z thereof, and the first wall 31 is a wall portion of the protective plate 30 facing away from the battery cell assembly 20 along the thickness direction Z thereof.

[0104] It can be understood that the partition wall 33 can be connected to the first wall 31 and the second wall 32 respectively by integral molding, welding, bonding, etc., or can abut against the first wall 31 and the second wall 32 respectively.

[0105] In this embodiment, by arranging the partition wall 33 between the first wall 31 and the second wall 32 and connecting the first wall 31 and the second wall 32, when one of the first wall 31 and the second wall 32 is subjected to an external impact force along the thickness direction Z of the protective plate 30, the partition wall 33 can transfer the external impact force to the other of the first wall 31 and the second wall 32, so that the first wall 31 and the second wall 32 jointly withstand the external impact force, thereby improving the overall impact resistance of the protective plate 30, thereby improving the reliability of the battery device 100.

[0106] Please refer to Figure 4According to some embodiments of the present application, the first wall 31 includes a first main body portion 311 and a first edge portion 312 surrounding the first main body portion 311; the second wall 32 includes a second main body portion 321 and a second edge portion 322 surrounding the second main body portion 321; the first edge portion 312 is connected to the second edge portion 322, and the partition wall 33 connects the first main body portion 311 and the second main body portion 321.

[0107] The first edge portion 312 is a portion of the first wall 31 used for connecting with the second wall 32 , and a thickness direction of the first edge is parallel to a thickness direction Z of the protective plate 30 .

[0108] In some embodiments, the first wall 31 also includes a first connecting portion 313, which is arranged around the edge of the first main body portion 311 and connects the first main body portion 311 and the first edge portion 312. The thickness direction of the first connecting portion 313 is perpendicular to the thickness direction Z of the protective plate 30.

[0109] The second edge portion 322 is a portion of the second wall 32 used for connecting with the first wall 31 , and a thickness direction of the second edge is parallel to a thickness direction Z of the protective plate 30 .

[0110] In some embodiments, the second wall 32 also includes a second connecting portion 323, which is arranged around the edge of the second main body portion 321 and connects the second main body portion 321 and the second edge portion 322. The thickness direction of the second connecting portion 323 is perpendicular to the thickness direction Z of the protective plate 30.

[0111] Exemplarily, the second connection portion 323 can be connected to the first connection portion 313 by molding or gluing; the partition wall 33 can be connected to the first main body portion 311 by molding or gluing, and / or the partition wall 33 can be connected to the second main body portion 321 by molding or gluing.

[0112] In this embodiment, the first edge portion 312 and the second edge portion 322 are used to connect the first wall 31 and the second wall 32, and the first main body portion 311, the first edge portion 312, the second main body portion 321 and the second edge portion 322 are jointly enclosed to form the accommodating cavity 301, which has a simple structure and is easy to implement.

[0113] According to some embodiments of the present application, the partition wall 33 is integrally formed with the first wall 31 , or the partition wall 33 is integrally formed with the second wall 32 .

[0114] In some embodiments, the first wall 31 is the wall portion of the protective plate 30 facing the battery cell assembly 20 along its thickness direction Z, the second wall 32 is the wall portion of the protective plate 30 away from the battery cell assembly 20 along its thickness direction Z, and the partition wall 33 is integrally formed with the second wall 32.

[0115] In some embodiments, the second wall 32 is the wall portion of the protective plate 30 facing the battery cell assembly 20 along its thickness direction Z, the first wall 31 is the wall portion of the protective plate 30 away from the battery cell assembly 20 along its thickness direction Z, and the partition wall 33 is integrally formed with the first wall 31.

[0116] In this embodiment, by integrally forming the first wall 31 or the second wall 32 and the partition wall 33, the structural strength of the connection between the first wall 31 or the second wall 32 and the partition wall 33 is better, and the risk of the first wall 31 or the second wall 32 and the partition wall 33 falling off at the connection is reduced. At the same time, the number of parts of the protective plate 30 is reduced, thereby simplifying the assembly of the partition wall 33 and facilitating improving the production efficiency of the battery device 100.

[0117] According to some embodiments of the present application, the first wall 31 is a fiber resin piece, and / or the second wall 32 is a fiber resin piece, and / or the partition wall 33 is a fiber resin piece.

[0118] For example, the fiber resin member may be a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

[0119] In some embodiments, the fiber resin part includes multiple layers of fiber-reinforced prepreg stacked on top of each other. The fibers in each layer of fiber-reinforced prepreg are arranged unidirectionally, and the fibers of two adjacent layers of fiber-reinforced prepreg are arranged in a staggered manner at approximately 90°, and the allowable deviation range of the ply angle of two adjacent layers of fiber-reinforced prepreg is ±20°. When subjected to a tensile force along the direction in which the fibers extend, the fibers in the fiber-reinforced prepreg can effectively bear the tensile force. By staggering the fibers of adjacent fiber-reinforced prepregs at approximately 90°, the force uniformity of the fiber resin part in all directions is improved.

[0120] In another embodiment, the fibers in the fiber-reinforced prepreg are interlaced to form a woven fabric.

[0121] In this embodiment, by setting one or more of the first wall 31, the second wall 32 and the partition wall 33 as fiber resin parts, part or the whole of the protective plate 30 has better corrosion resistance, reducing the risk of part or the whole of the protective plate 30 being damaged due to corrosion, and improving the reliability of the battery device 100; at the same time, fiber resin has a lower density than metal materials. Using fiber resin parts as part or the whole of the protective plate 30 is beneficial to reducing the weight of the protective plate 30, thereby reducing the weight of the battery device 100.

[0122] According to some embodiments of this application, please refer to Figures 5 - 7The cross section of the sub-cavity 301A perpendicular to the thickness direction Z of the protective plate 30 is polygonal.

[0123] A polygon is a two-dimensional figure consisting of three or more line segments connected end to end. For example, a polygon can be a pentagon, hexagon, octagon, etc.

[0124] In some embodiments, a cross section of the subcavity 301A perpendicular to the thickness direction Z of the protective plate 30 is a regular polygon with more than four sides.

[0125] It is understood that a regular polygon refers to a polygon with equal sides and equal angles. For example, a regular polygon can be a regular pentagon, a regular hexagon, a regular octagon, etc.

[0126] When the cross section of the sub-cavity 301A is a regular polygon, adjacent sub-cavities 301A can share the same partition wall 33 , thereby making better use of the partition wall 33 .

[0127] In this embodiment, by setting the cross-section of the sub-cavity 301A perpendicular to the thickness direction Z of the protective plate 30 to a polygon, any point on the two wall portions of the protective plate 30 that are opposite to each other in the thickness direction Z is directly supported by the partition wall 33, or, a partition wall 33 is provided around the outer periphery of any point on the two wall portions of the protective plate 30 that are opposite to each other in the thickness direction Z, thereby reducing the deformation of any point on the two wall portions of the protective plate 30 that are opposite to each other in the thickness direction Z when subjected to external impact force, thereby reducing the risk of damage to the protective plate 30 and improving the reliability of the battery device 100.

[0128] According to some embodiments of this application, please refer to Figure 7 , multiple sub-cavities 301A are arranged in a honeycomb shape.

[0129] In some embodiments, the cross section of the subcavity 301A perpendicular to the thickness direction Z of the protection plate 30 is a regular hexagon.

[0130] In this embodiment, by arranging multiple sub-cavities 301A in a honeycomb shape, when the protective plate 30 is subjected to external impact force, the partition wall 33 can disperse the impact force more evenly, thereby reducing the risk of damage to the protective plate 30 and improving the reliability of the battery device 100; at the same time, the honeycomb structure can be seamlessly spliced on the cross section of the protective plate 30 perpendicular to its thickness direction Z, and under the same volume, the surface area of the honeycomb structure is the smallest and the material consumption is the lowest, which is beneficial to reducing the weight of the protective plate 30 and further reducing the weight of the battery device 100.

[0131] According to some embodiments of this application, please refer to Figures 5 - 7 , multiple sub-cavities 301A are isolated from each other.

[0132] In this embodiment, by isolating multiple sub-chambers 301A from each other, when the protective plate 30 is damaged due to a large external impact force, only the non-Newtonian fluid in the damaged sub-chamber 301A leaks, thereby further reducing the volume of the non-Newtonian fluid leaking when the protective plate 30 is damaged, and further reducing the risk of the impact resistance of the protective plate 30 decreasing due to the continuous leakage of the non-Newtonian fluid, thereby further improving the reliability of the battery device 100.

[0133] According to some embodiments of the present application, please refer to Figure 2 , along the direction of gravity, the protective plate 30 is disposed at the bottom of the battery cell assembly 20, and the thickness direction Z of the protective plate 30 is parallel to the direction of gravity.

[0134] In this embodiment, by disposing the protective plate 30 at the bottom of the battery cell assembly 20 and the thickness direction Z of the protective plate 30 being parallel to the direction of gravity, the non-Newtonian fluid can be more evenly distributed in the accommodating chamber 301 under the action of gravity. Thus, when the protective plate 30 bears an external impact force, the non-Newtonian fluid can more evenly disperse the external impact force to the entire protective plate 30, thereby reducing the risk of buffer failure caused by local stress concentration and improving the reliability of the battery device 100.

[0135] According to some embodiments of the present application, please refer to Figure 2 , the battery device 100 further includes a box body 10; the box body 10 is used to accommodate the battery cell assembly 20, and the box body 10 has a bottom wall 121 for carrying the battery cell assembly 20; the protective plate 30 is disposed on the side of the bottom wall 121 facing away from the battery cell assembly 20.

[0136] In some embodiments, the box body 10 includes a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are covered with each other to form the box body 10, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 21. Exemplarily, in Figure 2 , the bottom wall 121 is a plate body of the second box body 12.

[0137] Optionally, the first box body 11 may be a hollow structure with a second opening at one end, and the second box body 12 may be a plate-like structure. The second box body 12 covers the second opening of the first box body 11 so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 may also both be hollow structures with one side open, and the open side of the second box body 12 covers the second opening of the first box body 11.

[0138] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid, etc. Exemplarily, inFigure 2 In this case, the box body 10 has a cuboid structure.

[0139] In this embodiment, the protection plate 30 is disposed on the side of the bottom wall 121 facing away from the battery cell assembly 20, so as to reduce the risk of the non-Newtonian fluid affecting the operation of the battery cell assembly 20 when the protection plate 30 is damaged and the non-Newtonian fluid leaks, and improve the reliability of the battery device 100.

[0140] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery device 100 of any of the above solutions, and the battery device 100 is used to provide electrical energy for the electrical device.

[0141] According to some embodiments of the present application, referring to Figures 2 - 7 , the embodiment of the present application provides a battery device 100, including a battery cell assembly 20 and a protection plate 30. The protection plate 30 is disposed on at least one side of the battery cell assembly 20. The protection plate 30 has a receiving cavity 301 therein, and a non-Newtonian fluid and a self-healing material are disposed in the receiving cavity 301. A partition wall 33 is disposed in the protection plate 30, and the partition wall 33 divides the receiving cavity 301 into a plurality of sub-cavities 301A. A non-Newtonian fluid and a self-healing material are disposed in each sub-cavity 301A. The plurality of sub-cavities 301A are isolated from each other, and the plurality of sub-cavities 301A are arranged in a honeycomb shape. The protection plate 30 includes a first wall 31 and a second wall 32 oppositely disposed along its thickness direction Z. The first wall 31 includes a first body portion 311 and a first edge portion 312 surrounding the first body portion 311; the second wall 32 includes a second body portion 321 and a second edge portion 322 surrounding the second body portion 321; the first edge portion 312 is connected to the second edge portion 322, and the partition wall 33 is connected to the first body portion 311 and the second body portion 321. The partition wall 33 is integrally formed with the first wall 31, or the partition wall 33 is integrally formed with the second wall 32. The first wall 31 is a fiber resin member, and / or the second wall 32 is a fiber resin member, and / or the partition wall 33 is a fiber resin member. The battery device 100 further includes a box body 10; the box body 10 is used to accommodate the battery cell assembly 20, and the box body 10 has a bottom wall 121 for carrying the battery cell assembly 20; the protection plate 30 is disposed on the side of the bottom wall 121 facing away from the battery cell assembly 20.

[0142] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0143] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: Battery cell assembly; A protective plate disposed on at least one side of the battery cell assembly, the protective plate having a receiving cavity therein, and a non-Newtonian fluid and a self-healing material are disposed in the receiving cavity.

2. The battery device according to claim 1, wherein A partition wall is disposed in the protective plate, and the partition wall divides the receiving cavity into a plurality of sub-cavities, and the non-Newtonian fluid and the self-healing material are disposed in each of the sub-cavities.

3. The battery device according to claim 2, wherein, The protective plate includes a first wall and a second wall oppositely disposed along its thickness direction, the partition wall is disposed between the first wall and the second wall, and connects the first wall and the second wall.

4. The battery device according to claim 3, characterized in that, The first wall includes a first body portion and a first edge portion surrounding the first body portion; The second wall includes a second body portion and a second edge portion surrounding the second body portion; The first edge portion is connected to the second edge portion, and the partition wall connects the first body portion and the second body portion.

5. The battery device according to claim 3, characterized in that, The partition wall is integrally formed with the first wall, or the partition wall is integrally formed with the second wall.

6. The battery device according to claim 3, wherein, The first wall is a fiber resin member, and / or the second wall is a fiber resin member, and / or the partition wall is a fiber resin member.

7. The battery device according to claim 2, wherein The cross-section of the sub-cavity perpendicular to the thickness direction of the protective plate is polygonal.

8. The battery device according to claim 7, characterized in that, The plurality of sub-cavities are arranged in a honeycomb pattern.

9. The battery device according to claim 2, wherein, The plurality of sub-cavities are isolated from each other.

10. The battery device according to claim 1, characterized in that, Along the direction of gravity, the protective plate is disposed at the bottom of the battery cell assembly, and the thickness direction of the protective plate is parallel to the direction of gravity.

11. The battery device according to any one of claims 1 to 10, characterized in that, The battery device further includes: A box body for accommodating the battery cell assembly, the box body having a bottom wall for carrying the battery cell assembly; The protective plate is disposed on a side of the bottom wall facing away from the battery cell assembly.

12. An electrical device, characterized in that, [[ID=!7]]Including the battery device according to any one of claims 1-11, the battery device is used for providing electric energy.

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