Battery, bottom protection plate and electric device

Abstract

A battery, a bottom guard plate and an electric device, the battery (20) comprising: a box body (21) comprising a bottom guard plate (10); the battery monomers (22) are arranged in the box body (21); wherein the bottom protection plate (10) comprises a first plastic plate layer (11), a second plastic plate layer (12) and a metal net (13) which are arranged in a stacked mode, the metal net (13) is located between the first plastic plate layer (11) and the second plastic plate layer (12), and the first plastic plate layer (11) and the second plastic plate layer (12) are both in contact with the metal net (13) and are fixedly connected with the metal net (13).

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and particularly to a battery, a bottom guard plate and an electrical device. Background Art

[0002] Secondary batteries, especially lithium-ion batteries, have the advantages of high voltage, high specific energy, long cycle life, green and pollution-free, wide operating temperature range and small self-discharge. They are widely used in portable electronic devices, energy storage devices and power equipment of large new energy electric vehicles, and are of great significance for solving human environmental pollution and energy crisis. With the wide application of lithium-ion batteries, improving the energy density of batteries has become a major concern for producers. Summary of the Utility Model

[0003] Embodiments of the present disclosure provide a battery, a bottom guard plate and an electrical device, which are beneficial to improving the energy density of the battery.

[0004] In one aspect of the present disclosure, there is provided a battery, including: a box body including a bottom guard plate; and battery cells disposed in the box body; wherein, the bottom guard plate includes: a first plastic plate layer, a second plastic plate layer and a metal mesh stacked, the metal mesh is located between the first plastic plate layer and the second plastic plate layer, and both the first plastic plate layer and the second plastic plate layer are in contact with and fixedly connected to the metal mesh.

[0005] In this embodiment, the bottom guard plate of the battery box body adopts a first plastic plate layer, a metal mesh and a second plastic plate layer stacked in sequence, and both the first plastic plate layer and the second plastic plate layer are in contact with and fixedly connected to the metal mesh. This stacked structure can utilize the grid structure of the metal mesh to disperse the load in all directions and absorb the impact force received by the bottom guard plate, thereby improving the stiffness and toughness of the bottom guard plate. Moreover, compared with other forms of additional structures, the metal mesh is lighter in weight, which can reduce the weight of the battery box body, and thus is beneficial to improving the energy density of the battery.

[0006] In some embodiments, the first plastic plate layer and the second plastic plate layer are in contact with and fixedly connected to each other.

[0007] In this embodiment, in addition to being in contact with and fixedly connected to the metal mesh, the first plastic plate layer and the second plastic plate layer are also in contact with and fixedly connected to each other. This can further enhance the stiffness of the bottom guard plate and realize the load transfer paths between the first plastic plate layer and the second plastic plate layer and among the first plastic plate layer, the metal mesh and the second plastic plate layer, so as to evenly disperse the external force and impact received, reduce the risk of local overstress and damage, and also make it not easy for the first plastic plate layer and the second plastic plate layer to move relative to each other, reducing the risk of the bottom guard plate becoming loose due to the relative movement between the two.

[0008] In some embodiments, the first plastic plate layer and the second plastic plate layer are at least in contact and fixedly connected outside the periphery of the metal mesh.

[0009] In this embodiment, the first plastic plate layer and the second plastic plate layer can be in contact and fixedly connected outside the periphery of the metal mesh, which is beneficial to separating the metal mesh from the outside and reducing the risk of corrosion of the metal mesh exposed to air or water. Moreover, the first plastic plate layer and the second plastic plate layer are not limited to being in contact and fixedly connected outside the periphery of the metal mesh, and can also be in contact and fixedly connected within the range where the metal mesh is located. For example, the first plastic plate layer and the second plastic plate layer can be in contact and fixed connection through one or more mesh holes of the metal mesh.

[0010] In some embodiments, the contact area between the first plastic plate layer and the second plastic plate layer outside the periphery of the metal mesh includes a closed graphic area surrounding the periphery of the metal mesh.

[0011] In this embodiment, the first plastic plate layer and the second plastic plate layer can form a closed graphic contact area outside the periphery of the metal mesh, which can more comprehensively separate the metal mesh from the outside, further reducing the risk of corrosion of the metal mesh exposed to air or water. Moreover, this closed graphic contact and fixed connection area is more stable and not easily separated, which is beneficial to improving the overall structural strength and stiffness.

[0012] In some embodiments, the first plastic plate layer and the second plastic plate layer are hermetically joined in the closed graphic area.

[0013] In this embodiment, by hermetically joining the first plastic plate layer and the second plastic plate layer in the closed graphic area, not only a high-strength combination is achieved between the first plastic plate layer and the second plastic plate layer in the closed graphic area, but also the sealing performance is further improved, so that the metal mesh is accommodated in a sealed enclosed space and is more reliably isolated from the outside.

[0014] In some embodiments, a receiving cavity for receiving the metal mesh is formed inside the closed graphic area between the first plastic plate layer and the second plastic plate layer.

[0015] In this embodiment, by arranging the metal mesh in the receiving cavity formed within the closed graphic area, the metal mesh can be avoided from being between the first plastic plate layer and the second plastic plate layer, which can reduce or eliminate the adverse effects of the metal mesh on the stable connection and sealing performance between the first plastic plate layer and the second plastic plate layer, and there is no need to cut and avoid when opening holes in the closed graphic area. In addition, the metal mesh in the receiving cavity can be better isolated from external air or water.

[0016] In some embodiments, the portion of the first plastic plate layer located inside the closed graphic area is recessed relative to the closed graphic area to accommodate at least part of the metal mesh, and / or the portion of the second plastic plate layer located inside the closed graphic area is recessed relative to the closed graphic area to accommodate at least part of the metal mesh.

[0017] In this embodiment, by making the portion of the first plastic plate layer located inside the closed graphic area recessed, or making the portion of the second plastic plate layer located inside the closed graphic area recessed, or making both the portion of the first plastic plate layer located inside the closed graphic area and the portion of the second plastic plate layer located inside the closed graphic area recessed, not only can a receiving cavity for the metal mesh be formed, but also the positioning during the installation of the metal mesh can be achieved, and the relative dislocation of the metal mesh relative to the first plastic plate layer and the second plastic plate layer can be reduced, improving the reliability of the fixed connection between the metal mesh and the first plastic plate layer and the second plastic plate layer respectively.

[0018] In some embodiments, the first plastic plate layer and the second plastic plate layer are respectively provided with a first mounting hole penetrating the first plastic plate layer in the thickness direction of the first plastic plate layer and a second mounting hole penetrating the second plastic plate layer in the thickness direction of the second plastic plate layer in the closed graphic area, and at least part of the first mounting hole is aligned with the second mounting hole, so that a fastener can pass through the first mounting hole and the second mounting hole to achieve the fixed connection between the first plastic plate layer and the second plastic plate layer, or the fixed connection between the bottom protection plate and the side wall of the box body.

[0019] In this embodiment, the first mounting hole and the second mounting hole are respectively provided at the positions of the first plastic plate layer and the second plastic plate layer corresponding to the closed graphic area, and at least part of the first mounting hole is aligned with the second mounting hole so as to pass through the fastener, so that the first plastic plate layer and the second plastic plate layer can achieve reliable fixed connection in the closed graphic area, or the first plastic plate layer and the second plastic plate layer can achieve reliable fixed connection with the side wall of the box body in the closed graphic area.

[0020] In some embodiments, the first plastic plate layer and the second plastic plate layer are provided with multiple groups of the first mounting holes and the second mounting holes in the closed graphic area, and the multiple groups of the first mounting holes and the second mounting holes are arranged at intervals along the extending direction of the periphery of the metal mesh.

[0021] In this embodiment, multiple groups of first mounting holes and second mounting holes spaced apart along the extension direction of the periphery of the metal mesh can be used for the insertion of multiple fasteners, so that the closed graphic area can be reliably fixed at multiple positions, thereby improving the connection reliability between the first plastic plate layer and the second plastic plate layer or the connection reliability between the bottom guard plate and the side wall of the box body.

[0022] In some embodiments, the metal mesh comprises a woven wire mesh.

[0023] Compared with metal perforated plates or other forms of metal mesh, the metal mesh including the metal wire mesh used in this embodiment can more easily change shape when subjected to force, can effectively absorb the impact energy applied to the bottom guard plate from the outside, achieve force dispersion, and reduce the risk of local stress concentration.

[0024] In some embodiments, the metal mesh has a plurality of meshes, and at least one of the first plastic sheet layer and the second plastic sheet layer has a protrusion embedded in at least a portion of the plurality of meshes.

[0025] In this embodiment, at least one of the first plastic sheet layer and the second plastic sheet layer has a protrusion that can be embedded in part or all of the multiple mesh holes of the metal mesh. This makes it less likely for at least one of the first plastic sheet layer and the second plastic sheet layer to shift laterally with the metal mesh, thereby forming a more stable and less likely to loosen fixed connection.

[0026] In some embodiments, the first plastic sheet layer, the metal mesh, and the second plastic sheet layer are integrally formed by compression molding.

[0027] In this embodiment, by molding the stacked first plastic plate layer, the metal mesh and the second plastic plate layer, the plastic material contained in the first plastic plate layer and the second plastic plate layer can be squeezed into the mesh formed by the metal mesh, thereby realizing the formation of the protrusion and the embedding of the mesh.

[0028] In some embodiments, the thickness T of the metal mesh satisfies: 0.2 mm ≤ T ≤ 2.5 mm.

[0029] In this embodiment, by ensuring that the thickness T of the metal mesh satisfies 0.2 mm ≤ T ≤ 2.5 mm, the weight of the bottom guard plate can be reduced while meeting the requirement of enhancing the rigidity of the bottom guard plate, which is beneficial to improving the battery energy density.

[0030] In some embodiments, the thickness T of the metal mesh satisfies: 0.5 mm ≤ T ≤ 1.2 mm.

[0031] In this embodiment, by further satisfying 0.5 mm ≤ T ≤ 1.2 mm for the thickness T of the metal mesh, the bottom guard plate can meet the requirements of good stiffness, more effectively reduce the weight of the bottom guard plate, and is beneficial to improving the battery energy density.

[0032] In some embodiments, at least one of the first plastic plate layer and the second plastic plate layer includes an injection molded plate, a thermoformed plate, a thermoplastic continuous fiber composite plate, or a thermosetting continuous fiber composite plate.

[0033] In this embodiment, at least one of the first plastic plate layer and the second plastic plate layer may include plates obtained by different preparation processes using pure plastic materials or plastic composite materials containing continuous fiber materials. Injection molded plates or thermoformed plates formed from pure plastic materials have lower costs, are easy to mold, and are convenient to process. Injection molded plates or thermoformed plates may also include the combination of plastic and short fibers. Both thermoplastic continuous fiber composite plates and thermosetting continuous fiber composite plates are compounded with continuous fiber materials, which can enable the bottom guard plate to obtain higher strength and stiffness. The resin in thermoplastic continuous fiber composite plates has good fluidity and is easy to mold. Thermosetting continuous fiber composite plates have the advantages of environmental friendliness and easy recycling.

[0034] In some embodiments, the box body includes: side walls fixedly connected to the bottom guard plate.

[0035] In this embodiment, the side walls of the box body are fixedly connected to the bottom guard plate, which can enclose a accommodation space for stably supporting and reliably accommodating battery cells.

[0036] In one aspect of the present disclosure, there is provided a bottom guard plate for a battery, including: a first plastic plate layer, a second plastic plate layer, and a metal mesh arranged in a stacked manner, the metal mesh being located between the first plastic plate layer and the second plastic plate layer, and both the first plastic plate layer and the second plastic plate layer being in contact with and fixedly connected to the metal mesh.

[0037] In this embodiment, the bottom guard plate for a battery adopts a first plastic plate layer, a metal mesh, and a second plastic plate layer arranged in a stacked manner in sequence, and both the first plastic plate layer and the second plastic plate layer are in contact with and fixedly connected to the metal mesh. This stacked structure can utilize the grid structure of the metal mesh to disperse the load in all directions and absorb the impact force received by the bottom guard plate, thereby improving the stiffness and toughness of the bottom guard plate. Moreover, compared with other forms of additional structures, the metal mesh is lighter in weight, which can reduce the weight of the battery, and thus is beneficial to improving the energy density of the battery.

[0038] In one aspect of the present disclosure, there is provided an electrical device, including: the aforementioned battery or the aforementioned bottom guard plate.

[0039] In this embodiment, the electrical device using the aforementioned battery or the aforementioned bottom guard plate is beneficial to increase the power usage duration and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings forming a part of the specification depict embodiments of the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0041] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, wherein:

[0042] Figure 1 is a schematic structural diagram of some embodiments of the electrical device according to the present disclosure;

[0043] Figure 2 is a schematic structural diagram of some embodiments of the battery according to the present disclosure;

[0044] Figure 3 is an exploded structural diagram of some embodiments of the bottom guard plate according to the present disclosure;

[0045] Figure 4 is a schematic structural diagram of some embodiments of the bottom guard plate from the z - direction perspective according to the present disclosure;

[0046] Figure 5 is Figure 4 a schematic structural diagram of the AA cross - section of

[0047] Figure 6 is a schematic cross - sectional structural diagram of the fixed connection between the side wall of the box body and the bottom guard plate in some embodiments of the battery according to the present disclosure.

[0048] It should be understood that the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components.

[0049] DESCRIPTION OF REFERENCE NUMERALS:

[0050] 10 - bottom guard plate; 11 - first plastic plate layer; 111 - first mounting hole; 112 - first protrusion; 12 - second plastic plate layer; 121 - second mounting hole; 122 - second protrusion; 13 - metal mesh; 131 - mesh hole;

[0051] 20 - battery; 21 - box body; 211 - side wall; 22 - battery cell; 23 - box cover;

[0052] 30 - vehicle;

[0053] CA - closed graphic area; FP - fastener; RG - groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure or its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0055] The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements preceding the term cover the elements listed after the term, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0056] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices and have an intermediate device.

[0057] All terms used in the present disclosure (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless specifically defined as such herein.

[0058] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0059] The term "plurality" as used in the present disclosure means two or more (including two).

[0060] In the embodiments of the present disclosure, the battery cell may be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging to continue use.

[0061] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0062] In some related technologies, the bottom guard plate of the battery pack adopts laminated fiberglass boards, and a metal plate sandwich layer is arranged between adjacent fiberglass boards of the laminated fiberglass boards to improve the strength of the bottom guard plate to resist the external intermittent and high-speed impact received by the bottom guard plate.

[0063] It has been found through research that in related technologies, the metal plate sandwich layer usually adopts a steel plate with good strength and has a large weight, resulting in a heavy bottom guard plate, which affects the energy density of the battery pack. Moreover, although the metal plate can be provided with through holes, it is still difficult to form a good interfacial adhesion force with the contacted fiberglass board, and there is a risk that the metal plate sandwich layer will separate and become loose from the fiberglass board during use.

[0064] In view of this, the embodiments of the present disclosure provide a battery, a bottom guard plate and an electrical device, which are beneficial to improving the energy density of the battery.

[0065] In one aspect of the present disclosure, a battery is provided, including: a box body including a bottom guard plate; and a battery cell disposed in the box body; wherein, the bottom guard plate includes: a first plastic plate layer, a second plastic plate layer and a metal mesh which are laminated, the metal mesh is located between the first plastic plate layer and the second plastic plate layer, and both the first plastic plate layer and the second plastic plate layer are in contact with and fixedly connected to the metal mesh.

[0066] In this embodiment, the bottom guard plate of the battery box body adopts a first plastic plate layer, a metal mesh and a second plastic plate layer which are sequentially laminated, and both the first plastic plate layer and the second plastic plate layer are in contact with and fixedly connected to the metal mesh. This laminated structure can utilize the grid structure of the metal mesh to disperse the load in all directions and absorb the impact force received by the bottom guard plate, thereby improving the stiffness and toughness of the bottom guard plate. Moreover, compared with other forms of additional structures, the metal mesh is lighter in weight, which can reduce the weight of the battery box body, thereby being beneficial to improving the energy density of the battery.

[0067] The battery according to the embodiments of the present disclosure can be used in various electrical devices that use batteries. The electrical devices can be mobile phones, portable devices, laptop computers, battery-powered vehicles, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal-cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers. The embodiments of the present disclosure do not impose special restrictions on the above-mentioned electrical devices.

[0068] The bottom guard plate according to the embodiments of the present disclosure can be used in various batteries. For example, the bottom guard plate serves as the bottom wall of the battery box.

[0069] In some embodiments, the battery may include a box body and a battery module. The box body is used to provide an accommodation space for the battery module, and the battery module is installed in the box body. The battery module may include a plurality of battery cells connected in series, parallel, or in a hybrid connection. A battery cell is the smallest unit that makes up a battery. A battery cell includes an electrode assembly capable of undergoing an electrochemical reaction.

[0070] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can form at least part of the floor of the vehicle, or part of the box body can form at least part of the cross beams and longitudinal beams of the vehicle.

[0071] [[ID=,12]]In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0072] Figure 1 It is a schematic structural diagram of some embodiments of the electrical device according to the present disclosure. For convenience, the electrical device is taken as an example of a vehicle for illustration. The vehicle 30 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle or a hybrid electric vehicle, etc. A battery 20 can be provided at the bottom, the front end, or the rear end of the vehicle 30.

[0073] The battery 20 can be used to supply power to the vehicle 30. For example, the battery 20 can serve as the operating power source of the vehicle 30 and be used for the circuit system of the vehicle 30, such as for the working power requirements during the start-up, navigation, and operation of the vehicle 30. The battery 20 can not only serve as the operating power source of the vehicle 30, but also serve as the driving power source of the vehicle 30, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 30.

[0074] The interior of the vehicle 30 may also be provided with an axle, wheels, a motor, and a controller. The controller is used to control the power supply of the battery 20 to the motor. For example, when the vehicle 30 uses the battery 20 as a driving power source, the controller can provide the power required for the motor to run at a constant speed or accelerate. The motor is used to drive the axle to rotate, so as to drive the wheels to rotate.

[0075] Figure 2 is a schematic structural view of some embodiments of the battery according to the present disclosure. Figure 3 is an exploded structural view of some embodiments of the bottom guard plate according to the present disclosure. Refer to Figure 2 and Figure 3 According to the embodiments of the present disclosure, a battery 20 is provided, including: a box body 21 and battery cells 22. The box body 21 includes a bottom guard plate 10. The battery cells 22 are disposed inside the box body 21. The bottom guard plate 10 includes: a first plastic plate layer 11, a second plastic plate layer 12, and a metal mesh 13 that are stacked. The metal mesh 13 is located between the first plastic plate layer 11 and the second plastic plate layer 12, and both the first plastic plate layer 11 and the second plastic plate layer 12 are in contact with and fixedly connected to the metal mesh 13.

[0076] In this embodiment, the box body 21 can provide functions such as cooling, sealing, and anti-impact for the battery cells 22 and other components inside the box body 21, or prevent liquids or other foreign objects from having an adverse impact on the charging and discharging or safety of the battery cells. The bottom guard plate 10 of the box body 21 can be disposed at the bottom of the box body to support and protect the components inside the box body, and can be used to support the battery cells 22 or other components, such as a cooling component.

[0077] Refer to Figure 2 In some embodiments, the battery 20 may further include a box cover 23, and the box cover 23 can cover the open side of the box body 21. The box body 21 and the box cover 23 can have various shapes, such as a cuboid or a cylinder. The box body 21 can be a hollow structure with one side open, and the box cover 23 is a plate-like structure. When the box cover 23 is closed on the open side of the box body 21, an internal accommodation space is formed. In another embodiment, the box body 21 is a hollow structure with one side open, and the box cover 23 is also a hollow structure with one side open. The open side of the box cover 23 is closed on the open side of the box body 21, then an internal accommodation space is formed.

[0078] There may be a plurality of battery cells 22, and they are electrically connected to each other (such as in series, parallel, or a combination of series and parallel) to achieve the required electrical performance parameters of the battery 20. The plurality of battery cells 22 can be arranged in rows, and one row or multiple rows of battery cells 22 can be arranged inside the box body 21 as needed.

[0079] In some embodiments, multiple battery cells 22 may be arranged along at least one of the length direction and the width direction of the box body 21. At least one row or one column of battery cells 22 may be provided according to actual needs. According to requirements, one layer or multiple layers of battery cells 22 may also be provided in the height direction of the battery 20.

[0080] In some embodiments, multiple battery cells 22 may first be connected in series, parallel, or in a hybrid connection to form a battery module, and then multiple battery modules may be connected in series, parallel, or in a hybrid connection to form an entirety, which is accommodated in the box body 21. In some other embodiments, all battery cells 22 are directly connected in series, parallel, or in a hybrid connection together, and then the entirety formed by all battery cells 22 is accommodated in the box body 21.

[0081] The battery cell 22 may include: a housing, an electrode assembly, and an end cap assembly. An electrolyte is further included inside the battery cell 22. The housing has a chamber and an end opening communicating with the chamber, and the chamber is used to accommodate the electrode assembly. The housing is determined according to the shape of one or more electrode assemblies, and the housing may be a hollow cuboid, a hollow cube, or a hollow cylinder. The housing may be made of a conductive metal material or plastic.

[0082] The end cap assembly is disposed at the end opening to form a sealed cavity for accommodating the electrode assembly with the housing. The end cap assembly may include two pole posts, the polarities of the two pole posts are opposite, and they are respectively electrically connected to the ears on the pole pieces with corresponding polarities in the electrode assembly through a connection assembly or directly.

[0083] The electrode assembly may include a positive electrode plate, a negative electrode plate, and a separator located between the positive electrode plate and the negative electrode plate. The operation of the battery cell is achieved by the movement of metal ions inside between the positive electrode plate and the negative electrode plate.

[0084] In some embodiments, the positive electrode plate may include a positive current collector substrate and a positive active material layer provided on at least one surface of the positive current collector substrate.

[0085] As an example, the positive current collector substrate has two surfaces opposite to each other in its own thickness direction, and the positive active material layer is provided on any one or both of the two opposite surfaces of the positive current collector substrate.

[0086] As an example, the positive current collector substrate may adopt a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by depositing a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as the battery positive electrode active material layer can also be used. These positive electrode active material layers can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and their modified compounds, etc.

[0088] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate.

[0089] As an example, the negative electrode current collector substrate can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by depositing a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] In some embodiments, the negative electrode sheet can include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0091] As an example, the negative electrode current collector substrate has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector substrate.

[0092] As an example, the negative electrode active material layer can use the negative electrode active material layer for battery cells well-known in the art. As an example, the negative electrode active material layer can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as the battery negative electrode active material layer can also be used. These negative electrode active material layers can be used alone or in combination of two or more.

[0093] In some embodiments, the material of the positive electrode current collector substrate can be aluminum, and the material of the negative electrode current collector substrate can be copper.

[0094] In some embodiments, the separator is a separator membrane. The present disclosure does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0095] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive electrode plate and the negative electrode plate, or can be attached to the surface of the positive electrode plate and / or the surface of the negative electrode plate while being located between the positive electrode plate and the negative electrode plate.

[0096] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode plate and the negative electrode plate, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0097] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The present disclosure does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0098] As an example, the liquid electrolyte includes an electrolyte salt and a solvent.

[0099] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0100] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0101] As an example, the gel-like electrolyte includes a polymer as the skeletal network of the electrolyte, combined with an ionic liquid-lithium salt.

[0102] As an example, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0103] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0104] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0105] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0106] In this embodiment, both the first plastic plate layer 11 and the second plastic plate layer 12 comprise plastic sheets. Here, the plastic plate layer comprises plastic material and may also comprise other materials. For example, the plastic plate layer may include a plastic sheet made of pure plastic material, or a plastic sheet made of plastic material composite with other materials (such as short fiber material or continuous fiber material).

[0107] The metal mesh 13 is formed by processing metal wires into a mesh structure. In some embodiments, the metal mesh 13 includes a metal wire woven mesh obtained by weaving metal wires. In other embodiments, the metal mesh 13 includes a metal wire welded mesh obtained by welding metal wires. The metal wire material of the metal mesh 13 can be metals such as copper, aluminum, or alloy materials such as stainless steel, aluminum alloy, etc.

[0108] The first plastic plate layer 11, the second plastic plate layer 12, and the metal mesh 13 can be stacked in sequence along the thickness direction of the bottom guard plate to achieve a laminated arrangement. The contact and fixed connection between the first plastic plate layer 11 and the second plastic plate layer 12 and the metal mesh 13 can be achieved in various ways. For example, by the constraining effect on the first plastic plate layer 11 and the second plastic plate layer 12 to make both the first plastic plate layer 11 and the second plastic plate layer 12 in close contact with the metal mesh 13, or by means of molding to achieve an embedded connection between the metal mesh 13 and the first plastic plate layer 11 and the second plastic plate layer 12, etc.

[0109] The bottom guard plate 10 of the battery box body is composed of a first plastic plate layer 11, a metal mesh 13, and a second plastic plate layer 12 that are stacked in sequence. The first plastic plate layer 11 and the second plastic plate layer 12 are both in contact with and fixedly connected to the metal mesh 13. This laminated structure can utilize the grid structure of the metal mesh 13 to disperse the load in all directions and absorb the impact force received by the bottom guard plate, thereby improving the stiffness and toughness of the bottom guard plate. Moreover, compared with other forms of additional structures, the metal mesh 13 is lighter in weight. When combined with lighter plastic materials, it can reduce the weight of the battery box body, which is beneficial to improving the energy density of the battery.

[0110] For the solution of preparing the bottom guard plate by the molding process, the grid structure of the metal mesh 13 is beneficial to making the materials of the first plastic plate layer 11 and the second plastic plate layer 12 flow into the grid during molding to form a structure embedded in the grid, thereby enhancing the interfacial bonding force.

[0111] Figure 4 It is a schematic structural diagram of some embodiments of the bottom guard plate according to the present disclosure from the z - direction perspective. Figure 5 is Figure 4 a schematic structural diagram of the AA cross - section of. Refer to Figure 5 , in some embodiments, the first plastic plate layer 11 and the second plastic plate layer 12 are in contact with and fixedly connected to each other.

[0112] The fixed connection between the first plastic plate layer 11 and the second plastic plate layer 12 can be achieved through a molding process, a connection structure between the plastic plate layers, or a connecting member that can be installed on the first plastic plate layer 11 and the second plastic plate layer 12 to achieve contact and fixed connection.

[0113] In this embodiment, in addition to both being in contact with and fixedly connected to the metal mesh 13, the first plastic plate layer 11 and the second plastic plate layer 12 are also in contact with and fixedly connected to each other. This can further enhance the stiffness of the bottom guard plate 10 and enable load transfer paths to exist both between the first plastic plate layer 11 and the second plastic plate layer 12 and among the first plastic plate layer 11, the metal mesh 13, and the second plastic plate layer 12. Thus, the external force and impact received can be evenly dispersed, reducing the risk of local over - stress and failure. Additionally, it also makes it difficult for the first plastic plate layer 11 and the second plastic plate layer 12 to move relative to each other, reducing the risk of the bottom guard plate 10 becoming loose due to the relative movement between the two.

[0114] Refer to Figure 4 , in some embodiments, the first plastic plate layer 11 and the second plastic plate layer 12 are in contact with and fixedly connected at least on the outer side of the periphery of the metal mesh 13.

[0115] In this embodiment, the first plastic plate layer 11 and the second plastic plate layer 12 can be in contact and fixedly connected on the outer side of the periphery of the metal mesh 13, which is beneficial to separating the metal mesh 13 from the outside and reducing the risk of corrosion of the metal mesh 13 exposed to air or water.

[0116] Moreover, the first plastic plate layer 11 and the second plastic plate layer 12 are not limited to being in contact and fixedly connected on the outer side of the periphery of the metal mesh 13, and can also achieve contact and fixedly connection within the range where the metal mesh 13 is located. For example, the contact and fixed connection between the first plastic plate layer 11 and the second plastic plate layer 12 is achieved through one or more mesh holes 131 of the metal mesh 13.

[0117] Reference Figure 3 and Figure 4 In some embodiments, the contact area of the first plastic plate layer 11 and the second plastic plate layer 12 on the outer side of the periphery of the metal mesh 13 includes a closed graphic area CA surrounding the periphery of the metal mesh 13.

[0118] In Figure 4 , the dashed line represents the inner contour of the closed graphic area CA, which is closed and rectangular. The outer contour of the closed graphic area CA can also be rectangular, such as the rectangular outer edge of the first plastic plate layer 11 and the second plastic plate layer 12. Correspondingly, the outer edge of the metal mesh 13 is also rectangular and is located inside the inner contour of the closed graphic area CA and is surrounded by the inner contour of the closed graphic area CA. The closed graphic area CA can be a closed polygon frame, a circular ring or an elliptical ring, etc.

[0119] In Figure 3 , the rectangular frame of the second plastic plate layer 12 near the outer edge is used to form the closed graphic area CA, and this area is also shown by a lead line here.

[0120] In this embodiment, the first plastic plate layer 11 and the second plastic plate layer 12 can form a closed graphic contact area on the outer side of the periphery of the metal mesh 13, which can more comprehensively separate the metal mesh 13 from the outside, further reduce the risk of corrosion of the metal mesh 13 exposed to air or water, and moreover, this closed graphic contact and fixed connection area is more stable and not easily detached, which is beneficial to improving the overall structural strength and stiffness.

[0121] In some embodiments, the first plastic plate layer 11 and the second plastic plate layer 12 are hermetically joined in the closed graphic area CA.

[0122] The hermetic joining of the closed graphic area CA can be formed by a one-piece molding process by die pressing, or can also be achieved by a seal (such as a gasket or sealant), etc.

[0123] In this embodiment, by hermetically bonding the first plastic plate layer 11 and the second plastic plate layer 12 in the closed graphic area CA, not only a high-strength bond is achieved between the first plastic plate layer 11 and the second plastic plate layer 12 in the closed graphic area CA, but also the sealing performance is further improved, so that the metal mesh 13 is accommodated in the sealed enclosed space, achieving a more reliable isolation from the outside.

[0124] Reference Figure 5 , in some embodiments, a receiving cavity for accommodating the metal mesh 13 is formed inside the closed graphic area CA between the first plastic plate layer 11 and the second plastic plate layer 12.

[0125] In this embodiment, by disposing the metal mesh 13 in the receiving cavity formed within the closed graphic area CA, the metal mesh 13 can be avoided from the bond between the first plastic plate layer 11 and the second plastic plate layer 12. This can reduce or eliminate the adverse effects of the metal mesh 13 on the stable connection and sealing performance between the first plastic plate layer 11 and the second plastic plate layer 12, and there is no need to make an avoidance when opening a hole in the closed graphic area CA. In addition, the metal mesh 13 in the receiving cavity can better isolate from the external air or water.

[0126] Reference Figure 3 and Figure 5 , in some embodiments, the portion of the first plastic plate layer 11 located inside the closed graphic area CA is recessed relative to the closed graphic area CA to accommodate at least part of the metal mesh 13, and / or, the portion of the second plastic plate layer 12 located inside the closed graphic area CA is recessed relative to the closed graphic area CA to accommodate at least part of the metal mesh 13.

[0127] In Figure 3 , the second plastic plate layer 12 located on the lower side has a groove RG, which is located inside the closed graphic area CA and is recessed downward relative to the closed graphic area CA, while the first plastic plate layer 11 located on the upper side may or may not be provided with a groove, and can enclose a receiving cavity for accommodating the metal mesh 13 with the second plastic plate layer 12.

[0128] In this embodiment, by making the part of the first plastic plate layer 11 inside the closed graphic area CA recessed, or making the part of the second plastic plate layer 12 inside the closed graphic area CA recessed, or making both the part of the first plastic plate layer 11 inside the closed graphic area CA and the part of the second plastic plate layer 12 inside the closed graphic area CA recessed, not only can a receiving cavity for receiving the metal mesh 13 be formed, but also the positioning during the installation of the metal mesh 13 can be achieved, and the relative displacement of the metal mesh 13 with respect to the first plastic plate layer 11 and the second plastic plate layer 12 can be reduced, thereby improving the reliability of the fixed connection between the metal mesh 13 and the first plastic plate layer 11 and the second plastic plate layer 12 respectively.

[0129] Figure 6 It is a schematic cross-sectional structure diagram of the fixed connection between the side wall 211 of the box body 21 and the bottom guard plate 10 in some embodiments of the battery 20 according to the present disclosure. Refer to Figure 5 and Figure 6 , in some embodiments, the first plastic plate layer 11 and the second plastic plate layer 12 are respectively provided with a first mounting hole 111 penetrating through the first plastic plate layer 11 along the thickness direction of the first plastic plate layer 11 and a second mounting hole 121 penetrating through the second plastic plate layer 12 along the thickness direction of the second plastic plate layer 12 in the closed graphic area CA. The first mounting hole 111 and the second mounting hole 121 are at least partially aligned so that a fastener FP passes through the first mounting hole 111 and the second mounting hole 121 to realize the fixed connection between the first plastic plate layer 11 and the second plastic plate layer 12, or the fixed connection between the bottom guard plate 10 and the side wall 211 of the box body 21.

[0130] The fastener FP can realize the fixed connection between the first plastic plate layer 11 and the second plastic plate layer 12 by passing through the first mounting hole 111 and the second mounting hole 121. For example, one of the first mounting hole 111 and the second mounting hole 121 is set as a threaded hole and the other is set as a non-threaded hole, and a fastener FP such as a bolt passes through the non-threaded hole and the threaded hole for threaded connection. The fastener FP can also pass through the first mounting hole 111 and the second mounting hole 121 to be connected to other structures, such as being connected to the side wall 211 of the box body 21. The first mounting hole 111 and the second mounting hole 121 are both set as non-threaded holes, and a threaded hole is provided on the side wall 211. A fastener FP such as a bolt passes through the first mounting hole 111 and the second mounting hole 121 in sequence, and then is threadedly connected to the threaded hole on the side wall 211.

[0131] In this embodiment, a first mounting hole 111 and a second mounting hole 121 are respectively provided at positions of the first plastic sheet layer 11 and the second plastic sheet layer 12 corresponding to the closed graphic area CA, and the first mounting hole 111 and the second mounting hole 121 are at least partially aligned so as to allow the fastener FP to be passed through. In this way, the first plastic sheet layer 11 and the second plastic sheet layer 12 can be reliably fixedly connected in the closed graphic area CA, or the first plastic sheet layer 11 and the second plastic sheet layer 12 can be reliably fixedly connected to the side wall 211 of the box body 21 in the closed graphic area CA.

[0132] The first mounting hole 111 and the second mounting hole 121 are both arranged outside the metal mesh 13 , so that the fasteners FP passing through the first mounting hole 111 and the second mounting hole 121 can reduce the influence of the metal mesh 13 on the fixed connection, making the fixed connection more reliable.

[0133] In some embodiments, the first plastic plate layer 11 and the second plastic plate layer 12 have multiple groups of first mounting holes 111 and second mounting holes 121 in the closed graphic area CA, and the multiple groups of first mounting holes 111 and second mounting holes 121 are arranged at intervals along the extension direction of the periphery of the metal mesh 13.

[0134] exist Figure 3 and Figure 4 In the embodiment, a plurality of groups of the first mounting holes 111 and the second mounting holes 121 are arranged at intervals along the long side and the short side of the rectangle.

[0135] In this embodiment, multiple groups of first mounting holes 111 and second mounting holes 121 spaced apart along the extension direction of the periphery of the metal mesh 13 can be used for the insertion of multiple fasteners FP, so that the closed graphic area CA can be reliably fixedly connected at multiple positions, thereby improving the connection reliability between the first plastic plate layer 11 and the second plastic plate layer 12 or the connection reliability between the bottom guard plate 10 and the side wall 211 of the box body 21.

[0136] In some embodiments, the metal mesh 13 comprises a woven metal wire mesh.

[0137] Compared with metal perforated plates or other forms of metal mesh 13, the metal mesh 13 comprising a metal wire mesh used in this embodiment can more easily change shape when subjected to force, can effectively absorb the impact energy applied to the bottom guard plate 10 from the outside, achieve force dispersion, and reduce the risk of local stress concentration.

[0138] refer to Figure 5 and Figure 6, in some embodiments, the metal mesh 13 has a plurality of mesh holes 131, and at least one of the first plastic plate layer 11 and the second plastic plate layer 12 has a raised portion that is embedded in at least a part of the plurality of mesh holes 131.

[0139] In Figure 5 , on one side surface of the first plastic plate layer 11 adjacent to the metal mesh 13, a first raised portion 112 is provided. The first raised portion 112 can be pre-formed before preparing the bottom guard plate or can be formed during the process of preparing the bottom guard plate. On one side surface of the second plastic plate layer 12 adjacent to the metal mesh 13, a second raised portion 122 is provided. The second raised portion 122 can be pre-formed before preparing the bottom guard plate or can be formed during the process of preparing the bottom guard plate.

[0140] In this embodiment, at least one of the first plastic plate layer 11 and the second plastic plate layer 12 has a raised portion that can be embedded in part or all of the plurality of mesh holes 131 of the metal mesh 13. In this way, it is not easy for at least one of the first plastic plate layer 11 and the second plastic plate layer 12 to undergo lateral displacement with respect to the metal mesh 13, thereby forming a more stable and not easily loosened fixed connection.

[0141] In some embodiments, the first plastic plate layer 11, the metal mesh 13, and the second plastic plate layer 12 are integrally formed by molding.

[0142] When performing the integral molding process on the bottom guard plate, the raised portion does not need to be pre-formed on at least one of the first plastic plate layer 11 and the second plastic plate layer 12. Instead, during the molding process, under the extrusion action between the edge of the mesh hole of the metal mesh and the surface of the plastic plate layer, the plastic material flows into the mesh hole to form the raised portion. In this way, the formed raised portion can better match the mesh hole.

[0143] In this embodiment, by molding the stacked first plastic plate layer 11, the metal mesh 13, and the second plastic plate layer 12, the plastic materials included in the first plastic plate layer 11 and the second plastic plate layer 12 can be extruded into the mesh holes 131 formed by the metal mesh 13, realizing the formation of the raised portion and the embedding into the mesh holes 131.

[0144] Reference Figure 5 , in some embodiments, the thickness T of the metal mesh 13 satisfies: 0.2 mm ≤ T ≤ 2.5 mm.

[0145] For the single-layer or multi-layer wire welded mesh, the thickness T of the wire mesh 13 here can be the diameter of a single wire or a multiple of the wire diameters of multiple wires. For the wire woven mesh, it can be the thickness at the overlapping position of the wires. The thickness T satisfies: 0.2 mm ≤ T ≤ 2.5 mm. For example, the thickness T can take values such as 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.8 mm, 2.2 mm, or 2.5 mm, etc.

[0146] In this embodiment, by making the thickness T of the wire mesh 13 satisfy 0.2 mm ≤ T ≤ 2.5 mm, while meeting the stiffness requirement of the bottom guard plate 10, the weight of the bottom guard plate 10 can be reduced, which is beneficial to improving the energy density of the battery 20.

[0147] In some embodiments, the thickness T of the wire mesh 13 satisfies: 0.5 mm ≤ T ≤ 1.2 mm.

[0148] In this embodiment, by making the thickness T of the wire mesh 13 further satisfy 0.5 mm ≤ T ≤ 1.2 mm, the bottom guard plate 10 can meet good stiffness requirements and more effectively reduce the weight of the bottom guard plate 10, which is beneficial to improving the energy density of the battery 20.

[0149] In some embodiments, at least one of the first plastic plate layer 11 and the second plastic plate layer 12 includes an injection molded plate, a thermoformed plate, a thermoplastic continuous fiber composite plate, or a thermosetting continuous fiber composite plate.

[0150] The resin material of the plastic material can be selected from polyamide PA, polypropylene PP, polyphenylene ether PPE, epoxy resin, etc. The injection molded plate or the thermoformed plate can be formed of pure plastic material or can also include the combination of plastic and short fibers. Both the thermoplastic continuous fiber composite plate and the thermosetting continuous fiber composite plate are compounded with continuous fiber materials, which can enable the bottom guard plate 10 to obtain higher strength and stiffness.

[0151] In this embodiment, at least one of the first plastic plate layer 11 and the second plastic plate layer 12 can include plates obtained by different preparation processes using pure plastic materials or plastic composite materials containing continuous fiber materials. The injection molded plate or the thermoformed plate formed of pure plastic material has a lower cost, is easy to mold, and is convenient to process. The thermoplastic continuous fiber composite plate has good resin fluidity and is easy to mold. The thermosetting continuous fiber composite plate has the advantages of environmental friendliness and easy recycling.

[0152] Reference Figure 2 and Figure 6 In some embodiments, the box body 21 includes: a side wall 211, which is fixedly connected to the bottom guard plate 10.

[0153] In this embodiment, the side wall 211 of the box body 21 is fixedly connected to the bottom protection plate 10, and a receiving space for stably supporting and reliably receiving the battery cell 22 can be enclosed.

[0154] In one aspect of the present disclosure, a bottom protection plate 10 for a battery 20 is provided, including: a first plastic plate layer 11, a second plastic plate layer 12, and a metal mesh 13 that are stacked, the metal mesh 13 is located between the first plastic plate layer 11 and the second plastic plate layer 12, and both the first plastic plate layer 11 and the second plastic plate layer 12 are in contact with and fixedly connected to the metal mesh 13.

[0155] In this embodiment, the bottom protection plate 10 for the battery 20 adopts a first plastic plate layer 11, a metal mesh 13, and a second plastic plate layer 12 that are sequentially stacked, and both the first plastic plate layer 11 and the second plastic plate layer 12 are in contact with and fixedly connected to the metal mesh 13. This stacked structure can utilize the grid structure of the metal mesh 13 to disperse the load in all directions and absorb the impact force received by the bottom protection plate 10, thereby improving the stiffness and toughness of the bottom protection plate 10. Moreover, compared with other forms of additional structures, the metal mesh 13 is lighter in weight, which can reduce the weight of the battery 20, thereby being beneficial to improving the energy density of the battery 20.

[0156] In one aspect of the present disclosure, an electrical device is provided, including: the aforementioned battery 20 or the aforementioned bottom protection plate 10.

[0157] In this embodiment, the electrical device adopting the aforementioned battery 20 or the aforementioned bottom protection plate 10 is beneficial to increasing the power-on duration and reducing the cost.

[0158] In some specific embodiments, as Figures 2 - 6 shown, the battery 20 includes: a box body 21 and a battery cell 22. The box body 21 includes a bottom protection plate 10 and a side wall 211 fixedly connected to the bottom protection plate 10. The battery cell 22 is disposed within the box body 21.

[0159] The bottom protection plate 10 includes: a first plastic plate layer 11, a second plastic plate layer 12, and a metal mesh 13 that are stacked, the metal mesh 13 is located between the first plastic plate layer 11 and the second plastic plate layer 12, and both the first plastic plate layer 11 and the second plastic plate layer 12 are in contact with and fixedly connected to the metal mesh 13.

[0160] The first plastic plate layer 11, the metal mesh 13, and the second plastic plate layer 12 are integrally formed by molding. The metal mesh 13 includes a metal wire woven mesh. The metal mesh 13 has a plurality of mesh holes 131, and at least one of the first plastic plate layer 11 and the second plastic plate layer 12 has a protruding portion embedded in at least a part of the plurality of mesh holes 131.

[0161] The contact area of the first plastic plate layer 11 and the second plastic plate layer 12 outside the periphery of the metal mesh 13 includes a closed graphic area CA surrounding the periphery of the metal mesh 13, and they are hermetically joined in the closed graphic area CA. An accommodation cavity for accommodating the metal mesh 13 is formed inside the closed graphic area CA between the first plastic plate layer 11 and the second plastic plate layer 12.

[0162] The part of the second plastic plate layer 12 located inside the closed graphic area CA is recessed with respect to the closed graphic area CA to form an accommodation cavity for accommodating the metal mesh 13 with the first plastic plate layer 11.

[0163] The first plastic plate layer 11 and the second plastic plate layer 12 are respectively provided with multiple groups of first mounting holes 111 and second mounting holes 121 in the closed graphic area CA, and the multiple groups of first mounting holes 111 and second mounting holes 121 are arranged at intervals along the extending direction of the periphery of the metal mesh 13.

[0164] The first mounting holes 111 penetrate through the first plastic plate layer 11 along the thickness direction of the first plastic plate layer 11, and the second mounting holes 121 penetrate through the second plastic plate layer 12 along the thickness direction of the second plastic plate layer 12 and are aligned with the first mounting holes 111. Fasteners FP pass through the first mounting holes 111 and the second mounting holes 121 to realize the fixed connection between the bottom guard plate 10 and the side wall 211 of the box body 21.

[0165] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0166] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery (20), characterized in that, Comprising: A box body (21), including a bottom protection plate (10); And A battery cell (22), disposed within the box body (21); Wherein, the bottom protection plate (10) includes: a first plastic plate layer (11), a second plastic plate layer (12), and a metal mesh (13) which are stacked, the metal mesh (13) is located between the first plastic plate layer (11) and the second plastic plate layer (12), and both the first plastic plate layer (11) and the second plastic plate layer (12) are in contact with and fixedly connected to the metal mesh (13).

2. The battery (20) according to claim 1, characterized in that, The first plastic plate layer (11) and the second plastic plate layer (12) are in contact with and fixedly connected to each other.

3. The battery (20) according to claim 2, characterized in that, The first plastic plate layer (11) and the second plastic plate layer (12) are in contact with and fixedly connected to each other at least on the outer side of the periphery of the metal mesh (13).

4. The battery (20) according to claim 3, characterized in that, The contact area of the first plastic plate layer (11) and the second plastic plate layer (12) on the outer side of the periphery of the metal mesh (13) includes a closed graphic area (CA) surrounding the periphery of the metal mesh (13).

5. The battery (20) according to claim 4, characterized in that, The first plastic plate layer (11) and the second plastic plate layer (12) are hermetically joined in the closed graphic area (CA).

6. The battery (20) according to claim 4 or 5, characterized in that, An accommodation cavity for accommodating the metal mesh (13) is formed inside the closed graphic area (CA) between the first plastic plate layer (11) and the second plastic plate layer (12).

7. The battery (20) according to claim 4, characterized in that, The portion of the first plastic plate layer (11) located inside the closed graphic area (CA) is recessed relative to the closed graphic area (CA) to accommodate at least part of the metal mesh (13), and / or, the portion of the second plastic plate layer (12) located inside the closed graphic area (CA) is recessed relative to the closed graphic area (CA) to accommodate at least part of the metal mesh (13).

8. The battery (20) according to claim 4, characterized in that, The first plastic plate layer (11) and the second plastic plate layer (12) are respectively provided with a first mounting hole (111) penetrating through the first plastic plate layer (11) along the thickness direction of the first plastic plate layer (11) and a second mounting hole (121) penetrating through the second plastic plate layer (12) along the thickness direction of the second plastic plate layer (12) in the closed graphic area (CA), and the first mounting hole (111) and the second mounting hole (121) are at least partially aligned so that a fastener (FP) passes through the first mounting hole (111) and the second mounting hole (121) to achieve the fixed connection between the first plastic plate layer (11) and the second plastic plate layer (12), or the fixed connection between the bottom protection plate (10) and the side wall (211) of the box body (21).

9. The battery (20) according to claim 8, characterized in that, Multiple groups of the first mounting holes (111) and the second mounting holes (121) are provided in the closed graphic area (CA) of the first plastic plate layer (11) and the second plastic plate layer (12), and the multiple groups of the first mounting holes (111) and the second mounting holes (121) are arranged at intervals along the extending direction of the periphery of the metal mesh (13).

10. The battery (20) according to claim 1, characterized in that, The metal mesh (13) includes a wire woven mesh.

11. The battery (20) according to claim 1, characterized in that, The metal mesh (13) has a plurality of mesh holes (131), and at least one of the first plastic plate layer (11) and the second plastic plate layer (12) has a raised portion embedded in at least part of the plurality of mesh holes (131).

12. The battery (20) according to claim 11, wherein, The first plastic plate layer (11), the metal mesh (13), and the second plastic plate layer (12) are integrally formed by molding.

13. The battery (20) according to claim 1, characterized in that, The thickness T of the metal mesh (13) satisfies: 0.2 mm ≤ T ≤ 2.5 mm.

14. The battery (20) according to claim 13, characterized in that, The thickness T of the metal mesh (13) satisfies: 0.5 mm ≤ T ≤ 1.2 mm.

15. The battery (20) according to claim 1, characterized in that, At least one of the first plastic plate layer (11) and the second plastic plate layer (12) includes an injection molded plate, a thermoformed plate, a thermoplastic continuous fiber composite plate, or a thermosetting continuous fiber composite plate.

16. The battery (20) according to claim 1, characterized in that, The box body (21) includes: Side walls (211) fixedly connected to the bottom protection plate (10).

17. A bottom guard plate (10) for a battery (20), characterized in that, including: The first plastic plate layer (11), the second plastic plate layer (12), and the metal mesh (13) are stacked, the metal mesh (13) is located between the first plastic plate layer (11) and the second plastic plate layer (12), and both the first plastic plate layer (11) and the second plastic plate layer (12) are in contact with and fixedly connected to the metal mesh (13).

18. An electrical device, characterized in that, including: The battery (20) according to any one of claims 1-16 or the bottom protection plate (10) according to claim 17.

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