Battery device, method of manufacturing the same, and electric device

Abstract

The application provides a battery device, a manufacturing method thereof and a power utilization device. It relates to the technical field of batteries. The battery device comprises a box body, a battery monomer assembly located in the box body, and a pressing plate assembly located in the box body and connected to one end of the battery monomer assembly along a first direction. The pressing plate assembly comprises a first pressing plate and a second pressing plate connected to one side of the first pressing plate along the first direction. The first direction is the thickness direction of the first pressing plate. The first pressing plate is formed with a plurality of first apertures. The second pressing plate is formed with a plurality of second apertures. The second pressing plate comprises a main body portion and a protruding portion connected alternately along a second direction. The main body portion is connected to the first pressing plate. Along the first direction, the protruding portion protrudes away from the first pressing plate relative to the main body portion. The protruding portion and the first pressing plate enclose a cavity. The second direction is perpendicular to the first direction.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery devices and their manufacturing methods, and electrical devices. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and battery devices are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the battery device can provide all or part of the power. In the field of energy storage, battery devices can be installed in energy storage boxes or directly on the user side.

[0003] In related technologies, battery devices include a housing and battery cell assemblies located inside the housing. When the battery device is subjected to an impact, the battery cell assemblies inside the housing may deform or the components in the electrode assembly may become misaligned. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a battery device and its manufacturing method, as well as an electrical device, to mitigate external impact and vibration.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] The first aspect of this application provides a battery device, comprising: a housing; a battery cell assembly located within the housing; and a pressure plate assembly located within the housing. The pressure plate assembly is connected to one end of the battery cell assembly along a first direction. The pressure plate assembly includes a first pressure plate and a second pressure plate connected to the first pressure plate along one side of the first direction. The first direction is the thickness direction of the first pressure plate. The first pressure plate has a plurality of first holes, and the second pressure plate has a plurality of second holes. The second pressure plate includes a main body portion and a protrusion portion alternately connected in sequence along a second direction. The main body portion is connected to the first pressure plate. Along the first direction, the protrusion portion protrudes away from the first pressure plate relative to the main body portion, and the protrusion portion and the first pressure plate enclose a cavity. The second direction intersects the first direction.

[0007] Because the first pressure plate has multiple first pores and the second pressure plate has multiple second pores, when the battery assembly is subjected to an impact (e.g., a bottom ball impact), the sidewalls of the first and second pressure plates with multiple first pores can deform to absorb the impact force, thereby reducing the impact force transmitted to the battery cell assembly. This lowers the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly, and mitigates external impact vibrations. Since the protrusion and the first pressure plate form a cavity, which can absorb energy, the pressure plate assembly can absorb even more impact force, reducing the impact force transmitted to the battery cell assembly. This further lowers the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly, and mitigates external impact vibrations.

[0008] In some embodiments, a first adhesive is provided between the pressure plate assembly and the battery cell assembly along a first direction; when projected along the first direction, at least a portion of the projection of the first pores of a plurality of first pores overlaps with at least a portion of the projection of the second pores of a plurality of second pores.

[0009] Since the projection along the first direction at least part of the projection of the first pores overlaps with at least part of the projection of the second pores at least part of the first pores, the first adhesive can overflow into the pores facing the battery cell assembly during the bonding process of the pressure plate assembly and the battery cell assembly using the first adhesive. Thus, the overflow of the first adhesive into the pores facing the battery cell assembly can be observed through another pore, which is beneficial to improving the bonding strength between the pressure plate assembly and the battery cell assembly.

[0010] In some embodiments, along a first direction, a second pressure plate is located between a first pressure plate and a battery cell assembly, and the diameter of the first pore is larger than the diameter of the second pore.

[0011] Because the diameter of the first pore is larger than that of the second pore, the diameter of the second pore is smaller, resulting in a larger bonding area between the second pressure plate and the battery cell assembly, thus improving the bonding strength between the second pressure plate and the battery cell assembly. The larger diameter of the first pore not only reduces the weight of the first pressure plate, thereby improving the lightweighting of the battery device, but also allows the first pressure plate to absorb more impact force, further reducing the impact force transmitted to the battery cell assembly, further reducing the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly, and further mitigating external impact vibrations.

[0012] In some embodiments, the diameter of the first pore is in the range of 35 mm to 45 mm.

[0013] Since the diameter of the first pore is in the range of 35mm to 45mm, it can not only reduce the weight of the first pressure plate and thus improve the lightweight of the battery device, but also help the first pressure plate absorb more impact force, further reduce the impact force transmitted to the battery cell assembly, further reduce the probability of deformation of the battery cell assembly or misalignment of the components in the battery cell assembly, and further mitigate external impact vibration.

[0014] In some embodiments, the diameter of the second pore is in the range of 30 mm to 40 mm.

[0015] Since the diameter of the second pore is in the range of 30mm to 40mm, it is possible to balance the energy absorption effect of the second pore with the bonding strength between the second pressure plate and the battery cell assembly.

[0016] In some embodiments, when projected along a first direction, the ratio of the total area of ​​the projection of the plurality of first pores to the total area of ​​the projection of the plurality of second pores is in the range of 45% to 65%.

[0017] Because the ratio of the total area of ​​the projection of the multiple first pores to the total area of ​​the projection of the multiple second pores is in the range of 45% to 65% when projected along the first direction, it is possible to balance the bonding strength between the second pressure plate and the battery cell assembly and the energy absorption effect of the first pressure plate.

[0018] In some embodiments, a plurality of first pores are arranged in a matrix, and / or a plurality of second pores are arranged in a matrix.

[0019] Because the multiple first pores are arranged in a matrix, their distribution within the first pressure plate is relatively uniform, resulting in a more even energy absorption effect at all locations within the first pressure plate, which is beneficial for the first pressure plate to absorb energy more effectively. Similarly, because the multiple second pores are arranged in a matrix, their distribution within the second pressure plate is relatively uniform, which is beneficial for a stronger bond between the second pressure plate and the battery cell assembly.

[0020] In some embodiments, a first aperture is provided at the connection between the first pressure plate and the main body, and a second aperture is provided on the main body. Projected along a first direction, at least a portion of the projection of the first aperture overlaps with at least a portion of the projection of the second aperture. The battery cell assembly includes a battery cell, and the battery cell includes a housing, an electrode terminal provided on the housing, and an electrode assembly located inside the housing and electrically connected to the electrode terminal. The electrode terminal is connected to the main body, and a first adhesive is provided between the electrode terminal and the main body.

[0021] Since the projection along the first direction overlaps at least a portion of the projection of the first pores with at least a portion of the projection of the second pores, and there is a first adhesive between the electrode terminal and the main body, the first adhesive can overflow into the pores facing the electrode terminals during the bonding process of the pressure plate assembly and the electrode terminals using the first adhesive. Thus, the overflow of the first adhesive into the pores facing the electrode terminals can be observed through another pore, which is beneficial to improving the bonding strength between the pressure plate assembly and the battery cell assembly.

[0022] In some embodiments, the battery cell assembly further includes a busbar, which is connected between the electrode terminals and the body portion along a first direction, and a first adhesive is present between the busbar and the body portion.

[0023] Since there is a first adhesive between the manifold and the main body, during the process of bonding the pressure plate assembly and the manifold with the first adhesive, the first adhesive can overflow into the hole facing the manifold. Thus, the overflow of the first adhesive into the hole facing the manifold can be observed through another hole, which is beneficial to improving the bonding strength between the pressure plate assembly and the manifold.

[0024] In some embodiments, the busbars in the same battery cell assembly are connected to the same body.

[0025] Since the busbars in the same battery cell assembly are connected to the same main body, the busbars in the same battery cell assembly form a whole, and the battery cells connected to the busbars can also form a whole. When the battery cells in the battery cell assembly thermally expand, the pressure plate assembly can apply an anti-expansion force to the battery cells in the battery cell assembly, reducing the probability of battery cell expansion. Moreover, the force on the battery cells can be transmitted to other battery cells through the pressure plate assembly, making the force on the battery cell assembly more uniform and reducing the probability of stress concentration in the battery cell assembly.

[0026] In some embodiments, along the first direction, the second pressure plate is located between the first pressure plate and the battery cell assembly, and along the second direction, the protrusion is located between the busbars in two adjacent battery cell assemblies, and the protrusion abuts against the housing of the battery cell in the two adjacent battery cell assemblies along the second direction.

[0027] Because the protrusion abuts against the casings of the battery cells in two adjacent battery cell assemblies along the second direction, the protrusion can fix the relative positions of the two adjacent battery cell assemblies along the second direction, which facilitates easier assembly of the battery device. Furthermore, since the protrusion abuts against the casings of the battery cells in two adjacent battery cell assemblies along the second direction, the step of fixing the relative positions of multiple battery cell assemblies using components such as pressure strips can be eliminated. This not only reduces the number of components but also reduces the assembly steps of the battery device, thereby accelerating the production efficiency of the battery device.

[0028] In some embodiments, the battery cell assembly includes a battery cell, the battery cell including a housing, electrode terminals disposed in the housing, and an electrode assembly located inside the housing and electrically connected to the electrode terminals, wherein the electrode terminals are located below the electrode assembly along the direction of gravity, and the pressure plate assembly is located below the electrode terminals.

[0029] Because the electrode terminals are located below the electrode assembly and the pressure plate assembly is located below the electrode terminals, the ability of the battery cell to resist the impact of the bottom ball is improved. Therefore, even if stones or protrusions on the ground hit the battery device, the pressure plate assembly can deform to absorb the impact force, thereby reducing the impact force transmitted to the battery cell assembly, reducing the probability of deformation of the battery cell assembly or misalignment of components in the battery cell assembly, and mitigating external impact vibration.

[0030] In some embodiments, the housing includes a first housing, electrode terminals facing the first housing in a first direction, a second pressure plate located between the first pressure plate and the battery cell assembly in the first direction, and the first housing and the first pressure plate connected by a second adhesive.

[0031] Because there is a second adhesive between the first housing and the first pressure plate, the first housing, the first pressure plate and the battery cell assembly can be formed as a whole, improving the overall mechanical strength of the battery device.

[0032] A second aspect of this application provides an electrical device comprising at least one of the aforementioned battery devices for storing or providing electrical energy.

[0033] Since the electrical device includes at least one of the aforementioned battery devices, the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly in the electrical device can be reduced, thus mitigating external impact vibrations.

[0034] A third aspect of this application provides a method for manufacturing a battery device. The battery device includes a pressure plate assembly, a battery cell assembly, a busbar, and a housing. The pressure plate assembly includes a first pressure plate and a second pressure plate connected to the first pressure plate along a first direction. The first direction is the thickness direction of the first pressure plate. The first pressure plate has a plurality of first holes, and the second pressure plate has a plurality of second holes. The second pressure plate includes a main body portion and a protrusion portion alternately connected in sequence along a second direction. The main body portion is connected to the first pressure plate. Along the first direction, the protrusion portion protrudes away from the first pressure plate relative to the main body portion, and the protrusion portion and the first pressure plate enclose a cavity. The second direction intersects the first direction. The pressure plate assembly and the battery cell assembly are located inside the housing. The battery cell includes a housing, electrode terminals disposed on the housing, and an electrode assembly located inside the housing and electrically connected to the electrode terminals. The busbar is electrically connected to the electrode terminals. The manufacturing method includes: bonding the pressure plate assembly to the battery cell assembly using a first adhesive. The first adhesive is located outside the area between the busbars of two adjacent battery cell assemblies.

[0035] Because the first pressure plate has multiple first pores and the second pressure plate has multiple second pores, the pressure plate assembly is bonded to the battery cell assembly using a first adhesive. Therefore, the pressure plate assembly can deform to absorb impact forces, reducing the impact force transmitted to the battery cell assembly and lowering the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly. Furthermore, since the first adhesive is located outside the area between the busbars of adjacent battery cell assemblies, no adhesive is needed in the area between the busbars of adjacent battery cell assemblies, reducing the number of manufacturing steps in the battery device and accelerating production efficiency.

[0036] The beneficial effects of the embodiments of this application include: the ability to mitigate external shocks and vibrations of the battery device. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0038] Figure 1 Structural schematic diagrams of vehicles provided for some embodiments of this application;

[0039] Figure 2 Partial structural schematic diagrams of the battery device provided for some embodiments of this application;

[0040] Figure 3 A partial structural schematic diagram of a battery device from another angle, provided for some embodiments of this application;

[0041] Figure 4 for Figure 3 Enlarged schematic diagram of region A1;

[0042] Figure 5 Schematic diagrams of the pressure plate assembly provided for some embodiments of this application;

[0043] Figure 6 for Figure 5 A magnified view of region B1;

[0044] Figure 7 A structural schematic diagram of the pressure plate assembly from another angle, provided for some embodiments of this application;

[0045] Figure 8 for Figure 7 A magnified schematic diagram of region C1;

[0046] Figure 9 A structural schematic diagram of the pressure plate assembly from another angle, provided for some embodiments of this application;

[0047] Figure 10 An exploded perspective view of a battery cell provided for some embodiments of this application.

[0048] Explanation of reference numerals in the attached figures

[0049] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 20, Housing; 20b, Second Housing; 10, Battery Cell Assembly; 1, Battery Cell; 11, Housing; 12, Electrode Terminal; 13, Electrode Assembly; 14, Tab; 101, Busbar; 2, Pressure Plate Assembly; 21, First Pressure Plate; 21a, First Hole; 22, Second Pressure Plate; 22a, Second Hole; 222, Protrusion; 2221, First Protruding Section; 22211, Protruding Main Body; 22212, Protruding Gap; 2222, Second Protruding Section; 223, Main Body; 23, Cavity; 3, First Adhesive; X, First Direction; Y, Second Direction; Z, Third Direction. Detailed Implementation

[0050] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0053] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0055] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "linking," "communication," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0058] The following is a detailed description of this application.

[0059] In related technologies, battery devices include a housing and individual battery cells located within the housing. In automotive applications, the battery device is typically mounted on the vehicle's chassis. During vehicle operation, the battery device mounted on the chassis may be subjected to impacts from below, such as stones kicked up from the road surface, or bumps from protruding structures on the ground. These impacts from below the battery device are collectively referred to as bottom ball impacts. When a battery device is subjected to a bottom ball impact, the impact force acting on the housing is transmitted to the individual battery cells, which can easily deform or cause misalignment of components within the cells. Research has shown that to reduce the probability of deformation of the individual battery cells or misalignment of components within the housing, a pressure plate assembly can be installed between the individual battery cells and the housing. This pressure plate assembly absorbs energy, thereby reducing the impact force transmitted to the individual battery cells and thus lowering the probability of deformation or misalignment of components within the individual battery cells.

[0060] Based on this design concept, this application provides a battery device, which includes: a housing; a battery cell assembly located inside the housing; and a pressure plate assembly located inside the housing. The pressure plate assembly is connected to one end of the battery cell assembly along a first direction. The pressure plate assembly includes a first pressure plate and a second pressure plate connected to the first pressure plate along one side of the first direction. The first direction is the thickness direction of the first pressure plate. The first pressure plate has a plurality of first holes, and the second pressure plate has a plurality of second holes. The second pressure plate includes a main body portion and a protrusion portion alternately connected in sequence along a second direction. The main body portion is connected to the first pressure plate. Along the first direction, the protrusion portion protrudes away from the first pressure plate relative to the main body portion, and the protrusion portion and the first pressure plate enclose a cavity. The second direction intersects the first direction.

[0061] Because the first pressure plate has multiple first pores and the second pressure plate has multiple second pores, when the battery assembly is subjected to an impact (e.g., a bottom ball impact), the sidewalls of the first and second pressure plates with multiple first pores can deform to absorb the impact force, thereby reducing the impact force transmitted to the battery cell assembly and lowering the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly. Since the protrusion and the first pressure plate form a cavity, the cavity can absorb energy; therefore, the pressure plate assembly can absorb even more impact force, reducing the impact force transmitted to the battery cell assembly, lowering the probability of deformation of the battery cell assembly or misalignment of components within the battery cell assembly, and mitigating external impact vibrations.

[0062] The battery cells and battery devices provided in this application embodiment can be used, but are not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0063] This application also provides an electrical device including the above-described battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0064] In the following embodiments, for ease of explanation, an example of an electrical device of this application, namely a vehicle 1000, will be used for illustration.

[0065] Figure 1 The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0066] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] Figure 2 The diagram below shows a partial structural schematic of a battery device provided for some embodiments of this application. The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. Each battery cell assembly 10 may include multiple battery cells 1, which can be connected in series, parallel, or in a mixed configuration via a busbar.

[0068] In some embodiments, the battery cell assembly 10 is typically formed by arranging multiple battery cells 1; as an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 1 into a single module. As an example, the battery module can be formed by bundling multiple battery cells 1 together with cable ties.

[0069] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more battery cell assemblies 10 housed within the housing.

[0070] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing by fixing the battery module in the housing.

[0071] As an example, the battery cell assembly 10 can also be housed in the housing by directly fixing multiple battery cells 1 to the housing 20.

[0072] As an example, the housing 20 may include a first housing (not shown) and a second housing 20b. The first housing and the second housing 20b are fastened together to form a closed space inside the housing 20 to house the battery cell 1 assembly. Here, "closed" refers to covering or shutting off; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. In a specific embodiment, the first housing is a top cover. In this embodiment, the battery cell 1 may be a secondary battery, which refers to a battery cell that can be recharged after discharge to activate its active materials and continue to be used.

[0073] The battery cell 1 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0074] Battery cell 1 generally includes electrode assembly 13 (see Figure 10 The electrode assembly 13 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between them while allowing active ions to pass through.

[0075] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0076] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0077] In some embodiments, the electrode assembly 13 further includes an isolator disposed between the positive and negative electrodes.

[0078] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0079] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not impose specific limitations on the type of electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0080] In some embodiments, the electrode assembly 13 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0081] In some embodiments, the electrode assembly 13 has a stacked structure.

[0082] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0083] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0084] In some embodiments, the electrode assembly 13 may be cylindrical, flat, or polygonal, etc.

[0085] In some embodiments, the electrode assembly 13 is provided with tabs 14, which can conduct current from the electrode assembly 13. The tabs include a positive tab and a negative tab.

[0086] In some embodiments, the battery cell 1 may include a housing 11. The housing 11 is used to encapsulate components such as the electrode assembly 13 and the electrolyte. The housing 11 may be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0087] As an example, battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0088] In some embodiments, such as Figure 10 As shown, the housing 11 includes an end cap assembly and a housing. The housing has an opening, and the end cap assembly closes the opening to form a sealed space for accommodating the electrode assembly 13 and substances such as electrolytes. The housing may have one or more openings. The end cap assembly may also have one or more.

[0089] In some embodiments, at least one electrode terminal 12 is provided on the housing 11, and the electrode terminal 12 is electrically connected to the tab 14. The electrode terminal 12 can be directly connected to the tab, or it can be indirectly connected to the tab through an adapter. The electrode terminal 12 can be provided on the end cap assembly or on the housing.

[0090] In some embodiments, a pressure relief mechanism is provided on the housing 11. The pressure relief mechanism is used to release the internal pressure of the battery cell 1.

[0091] Below, refer to Figures 2 to 10 Some embodiments of this application will be described in detail.

[0092] In the description of the embodiments of this disclosure, for ease of explanation, the direction of arrow X represents the "first direction", the direction of arrow Y represents the "second direction", and the direction of arrow Z represents the "third direction". The first direction X, the second direction Y, and the third direction Z intersect each other and are not coplanar. Furthermore, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0093] The first aspect of this application provides a battery device 100, such as Figures 2 to 9As shown, the battery device 100 includes a housing 20, a battery cell assembly 10, and a pressure plate assembly 2. The battery cell assembly 10 is located inside the housing 20. The pressure plate assembly 2 is located inside the housing 20 and is connected to one end of the battery cell assembly 10 along a first direction X. The pressure plate assembly 2 includes a first pressure plate 21 and a second pressure plate 22 connected to the first pressure plate 21 along the first direction X. The first direction X is the thickness direction of the first pressure plate 21. The first pressure plate 21 has a plurality of first holes 21a, and the second pressure plate 22 has a plurality of second holes 22a.

[0094] The battery cell assembly 10 includes a plurality of battery cells 1, and each battery cell 1 includes a housing 11 and electrode terminals 12 disposed on the housing. Optionally, the pressure plate assembly 2 can be connected to a housing wall in the housing where electrode terminals are disposed, or it can be connected to a housing wall in the housing where electrode terminals are not disposed.

[0095] Optionally, the battery cell assembly 10 can be directly connected to the pressure plate assembly 2, for example, by direct bonding with structural adhesive; such as... Figure 4 As shown, the battery cell assembly 10 can be indirectly connected to the pressure plate assembly 2. For example, the pressure plate assembly 2 is connected to the busbar 101, and the busbar 101 is connected to the battery cell assembly 10. The pressure plate assembly 2 and the busbar 101 can be bonded together with structural adhesive.

[0096] In some embodiments, such as Figure 2 As shown, the battery cell assembly 10 includes a plurality of battery cells 1 arranged along the third direction Z. The large surface of the battery cell 1 is perpendicular to the third direction Z. The "large surface" refers to the surface with the largest area on the outer surface of the battery cell 1. At least some of the battery cells 1 in the same battery cell assembly 10 are connected to the pressure plate assembly 2.

[0097] In some embodiments, the pressure plate assembly 2 extends along a third direction Z.

[0098] In some embodiments, the pressure plate assembly 2 is made of aluminum alloy.

[0099] Optionally, the first pressure plate 21 can be connected between the second pressure plate 22 and the battery cell assembly 10, or the second pressure plate 22 can be connected between the first pressure plate 21 and the battery cell assembly 10.

[0100] Optionally, such as Figure 5 and Figure 6 As shown, the first pressure plate 21 can form two, three, four or five first pores 21a.

[0101] Optionally, the shape of the projection of the first aperture 21a along the first direction X can be a regular or irregular shape such as a circle, triangle, or hexagon.

[0102] Optionally, the shapes and sizes of the multiple first pores 21a may be the same or different; the distances between adjacent first pores 21a may be equal or unequal.

[0103] For example, the first pressure plate 21 is configured as a honeycomb structure.

[0104] Optionally, such as Figure 7 and Figure 8 As shown, the second pressure plate 22 can form two, three, four or five second pores 22a.

[0105] Optionally, the shape of the projection of the second aperture 22a along the first direction X can be a regular or irregular shape such as a circle, triangle, or hexagon.

[0106] Optionally, the shapes and sizes of the multiple second pores 22a may be the same or different; the distances between adjacent second pores 22a may be equal or unequal.

[0107] For example, the second pressure plate 22 is configured as a honeycomb structure.

[0108] In the embodiments of this disclosure, since the first pressure plate 21 has a plurality of first holes 21a and the second pressure plate 22 has a plurality of second holes 22a, when the battery device 100 is subjected to an impact (e.g., a bottom ball impact), the sidewalls of the first pressure plate 21 with a plurality of first holes 21a and the sidewalls of the second pressure plate 22 with a plurality of second holes 22a can deform to absorb the impact force, thereby reducing the impact force transmitted to the battery cell assembly 10 and reducing the probability of deformation of the battery cell assembly 10 or misalignment of components in the battery cell assembly 10 within the housing 20.

[0109] In some embodiments, along the first direction X, the pressure plate assembly 2 and the battery cell assembly 10 have a first adhesive 3; projected along the first direction X, at least a portion of the projection of the first pores 21a of the plurality of first pores 21a overlaps at least a portion of the projection of the second pores 22a of the plurality of second pores 22a.

[0110] Apply the first adhesive 3 to the battery cell assembly 10, and then attach the pressure plate assembly 2 to the battery cell assembly 10.

[0111] Optionally, the first adhesive 3 can be a structural adhesive.

[0112] Optionally, when projecting along the first direction X, a portion of the projection of the first aperture 21a may overlap with a portion of the projection of the second aperture 22a; when projecting along the first direction X, all the projections of the first aperture 21a may overlap with a portion of the projection of the second aperture 22a; when projecting along the first direction X, a portion of the projection of the first aperture 21a may overlap with all the projections of the second aperture 22a; when projecting along the first direction X, all the projections of the first aperture 21a may overlap with all the projections of the second aperture 22a.

[0113] Optionally, when projecting along the first direction X, a portion of the projection of the first aperture 21a may overlap with a portion of the projection of the second aperture 22a; when projecting along the first direction X, the entire projection of the first aperture 21a may overlap with a portion of the projection of the second aperture 22a; when projecting along the first direction X, a portion of the projection of the first aperture 21a may overlap with the entire projection of the second aperture 22a; when projecting along the first direction X, the entire projection of the first aperture 21a may overlap with the entire projection of the second aperture 22a.

[0114] In the embodiments of this disclosure, since the projection of at least a portion of the first holes 21a in the plurality of first holes 21a along the first direction X overlaps with at least a portion of the projection of at least a portion of the second holes 22a in the plurality of second holes 22a, the first adhesive 3 can overflow into the holes facing the battery cell assembly 10 during the bonding process of the pressure plate assembly 2 and the battery cell assembly 10 using the first adhesive 3. Thus, the overflow of the first adhesive 3 into the holes facing the battery cell assembly 10 can be observed through another hole, which is beneficial to improving the bonding strength between the pressure plate assembly 2 and the battery cell assembly 10.

[0115] It is understandable that, when projected along the first direction X, the projection of the first aperture 21a and the projection of the second aperture 22a can be staggered, that is, they do not overlap.

[0116] In some embodiments, such as Figure 4 , Figure 6 and Figure 8 As shown, along the first direction X, the second pressure plate 22 is located between the first pressure plate 21 and the battery cell assembly 10, and the diameter D1 of the first hole 21a is larger than the diameter D2 of the second hole 22a.

[0117] The diameter D1 of the first aperture 21a refers to the diameter of the projection of the first aperture 21a along the first direction X when the projection of the first aperture 21a is circular; or the diameter of the incircle of the projection of the first aperture 21a when the projection of the first aperture 21a is non-circular, for example, the diameter of the incircle of the projection of the first aperture 21a when the projection of the first aperture 21a is hexagonal. Figure 6 The diameter of the dashed circle shown.

[0118] The diameter D2 of the second aperture 22a refers to the diameter of the projection of the second aperture 22a along the first direction X when the projection of the second aperture 22a is circular; or the diameter of the incircle of the projection of the second aperture 22a when the projection of the second aperture 22a is non-circular, for example, the diameter of the incircle of the projection of the second aperture 22a when the projection of the second aperture 22a is hexagonal. Figure 8 The diameter of the dashed circle shown.

[0119] Optionally, the diameter D1 of some of the first pores 21a may be larger than the diameter D2 of all the second pores 22a, or the diameter D1 of all the first pores 21a may be larger than the diameter D2 of all the second pores 22a.

[0120] In the embodiments of this disclosure, since the diameter D1 of the first pore 21a is larger than the diameter D2 of the second pore 22a, the diameter D2 of the second pore 22a is smaller, resulting in a larger bonding area between the second pressure plate 22 and the battery cell assembly 10, thus improving the bonding strength between the second pressure plate 22 and the battery cell assembly 10. The larger diameter D1 of the first pore 21a not only reduces the weight of the first pressure plate 21, thereby improving the lightweighting of the battery device 100, but also allows the first pressure plate 21 to absorb more impact force, further reducing the impact force transmitted to the battery cell assembly 10, and further reducing the probability of deformation of the battery cell assembly 10 or misalignment of components within the battery cell assembly inside the housing 20.

[0121] It is understandable that the diameter D1 of the first pore 21a can be less than or equal to the diameter D2 of the second pore 22a.

[0122] In some embodiments, such as Figure 6 As shown, the diameter D1 of the first pore 21a is in the range of 35 mm to 45 mm.

[0123] Optionally, the diameter D1 of the first pore 21a can be 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, or 45mm, or any value between any two of the above. The diameter D1 of different first pores 21a can be equal or unequal.

[0124] In the embodiments of this disclosure, since the diameter of the first pore 21a is in the range of 35mm to 45mm, it can not only reduce the weight of the first pressure plate 21 and thus improve the lightweight of the battery device 100, but also help the first pressure plate 21 absorb more impact force, further reduce the impact force transmitted to the battery cell assembly 10, and further reduce the probability of deformation of the battery cell assembly 10 or misalignment of components in the battery cell assembly within the housing 20.

[0125] It is understandable that the diameter D1 of the first pore 21a can be less than 35 mm or greater than 45 mm.

[0126] In some embodiments, such as Figure 8 As shown, the diameter of the second pore 22a is in the range of 30 mm to 40 mm.

[0127] Optionally, the diameter D2 of the second pore 22a can be 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, or 40mm, or any value between any two of the above. The diameter D2 of different second pores 22a can be equal or unequal.

[0128] In the embodiments of this disclosure, since the diameter of the second pore 22a is in the range of 30mm to 40mm, the energy absorption effect of the second pore 22a and the bonding strength between the second pressure plate 22 and the battery cell assembly 10 can be taken into account.

[0129] It is understandable that the diameter D2 of the second pore 22a can be less than 30 mm or greater than 40 mm.

[0130] In some embodiments, when projected along the first direction X, the ratio of the total area of ​​the projection of the plurality of first apertures 21a to the total area of ​​the projection of the plurality of second apertures 22a is in the range of 45% to 65%.

[0131] Projecting along the first direction X, the ratio of the sum of the projected areas of all first apertures 21a to the sum of the projected areas of all second apertures 22a is in the range of 45% to 65%.

[0132] Optionally, the ratio of the total area of ​​the projection of the plurality of first apertures 21a to the total area of ​​the projection of the plurality of second apertures 22a along the first direction X can be 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, etc., or of any value between the two mentioned above.

[0133] In the embodiments of this disclosure, since the total area of ​​the projection of the plurality of first pores 21a along the first direction X is projected, the ratio of the total area of ​​the projection of the plurality of second pores 22a is in the range of 45% to 65%, thereby taking into account both the bonding strength between the second pressure plate 22 and the battery cell assembly 10 and the energy absorption effect of the first pressure plate 21.

[0134] It is understandable that, when projected along the first direction X, the ratio of the total area of ​​the projection of the plurality of first apertures 21a to the total area of ​​the projection of the plurality of second apertures 22a can be less than 45% or greater than 65%.

[0135] In some embodiments, a plurality of first pores 21a are arranged in a matrix, and / or a plurality of second pores 22a are arranged in a matrix.

[0136] In some embodiments, the plurality of first pores 21a are arranged in a matrix.

[0137] In some embodiments, the plurality of second pores 22a are arranged in a matrix.

[0138] In some embodiments, a plurality of first pores 21a are arranged in a matrix, and a plurality of second pores 22a are arranged in a matrix.

[0139] In the embodiments of this disclosure, since the multiple first pores 21a are arranged in a matrix, the distribution of the first pores 21a in the first pressure plate 21 is relatively uniform, and the energy absorption effect at each position in the first pressure plate 21 is more uniform, which is conducive to the first pressure plate 21 absorbing energy more effectively. Since the multiple second pores 22a are arranged in a matrix, the distribution of the second pores 22a in the second pressure plate 22 is relatively uniform, which is conducive to a more firm adhesion between the second pressure plate 22 and the battery cell assembly 10.

[0140] It is understandable that the multiple first pores 21a may not be arranged in a matrix.

[0141] In some embodiments, such as Figure 4 As shown, the second pressure plate 22 includes a main body 223 and a protrusion 222 that are alternately connected along the second direction Y. The main body 223 is connected to the first pressure plate 21. Along the first direction X, the protrusion 222 protrudes away from the first pressure plate 21 relative to the main body 223. The protrusion 222 and the first pressure plate 21 enclose a cavity 23. The second direction Y intersects the first direction X.

[0142] In some embodiments, the surface of the main body 223 facing the first pressure plate 21 along the first direction X is a plane, which helps to improve the bonding strength between the first pressure plate 21 and the main body 223. Of course, the surface of the main body 223 facing the first pressure plate 21 along the first direction X is a curved surface with a slight curvature.

[0143] Optionally, the projection of the cavity 23 along the third direction Z can be a regular or irregular shape such as a trapezoid or rectangle.

[0144] In some embodiments, the protrusion 222 has a first protruding section 2221 and a second protruding section 2222 connected to the first protruding section 2221 on one side along the second direction Y. The first protruding section 2221 is opposite to the first pressure plate 21 along the first direction X, and the second protruding section 2222 connects the first protruding section 2221 and the main body 223. Further, the further away from the first protruding section 2221, the smaller the distance between the second protruding section 2222 and the first pressure plate 21 along the first direction X. The number of second protruding sections 2222 is two, such as... Figure 4 As shown, the two second protruding segments 2222 are located to the left and right of the first protruding segment 2221, respectively.

[0145] In some embodiments, the first protrusion 2221 is bonded to the busbar 101.

[0146] In some embodiments, such as Figure 4 As shown, the first protruding section 2221 includes a protruding main body portion 22211 and a protruding protrusion portion 22212 connected to the protruding main body portion 22211 and oriented towards the battery cell assembly 10 in the first direction X. The protruding protrusion portion 22212 abuts against the battery cell assembly 10.

[0147] For example, the protruding portion 22212 abuts against the busbar.

[0148] In some embodiments, the number of protruding protrusions 22212 in the same first protruding segment 2221 is at least two, and protruding protrusions 22212 are provided at both ends of the protruding main body portion 22211 along the second direction Y.

[0149] In some embodiments, the protruding portion 22212 may extend along a third direction Z.

[0150] In the embodiments of this disclosure, since the protrusion 222 and the first pressure plate 21 form a cavity 23, the cavity 23 can absorb energy. Therefore, the pressure plate assembly 2 can absorb more impact force, reduce the impact force transmitted to the battery cell assembly 10, and reduce the probability of deformation of the battery cell assembly 10 or misalignment of components in the battery cell assembly within the housing 20.

[0151] In some embodiments, such as Figures 4 to 6 As shown, the first hole 21a is provided at the connection between the first pressure plate 21 and the main body 223, such as... Figure 7 and Figure 8As shown, a second pore 22a is provided on the main body 223. Projected along the first direction X, at least a portion of the projection of the first pore 21a among the plurality of first pores 21a overlaps at least a portion of the projection of the second pore 22a among the plurality of second pores 22a. The battery cell assembly 10 includes a battery cell 1, as shown. Figure 10 As shown, the battery cell 1 includes a housing 11, an electrode terminal 12 disposed on the housing 11, and an electrode assembly 13 located inside the housing 11 and electrically connected to the electrode terminal 12. The electrode terminal 12 is connected to the main body 223, and a first adhesive 3 is provided between the electrode terminal 12 and the main body 223.

[0152] The first adhesive 3 bonds the electrode terminals and the main body 223.

[0153] Optionally, the first adhesive 3 is a structural adhesive.

[0154] In the embodiments of this disclosure, since the projection of at least a portion of the first holes 21a in the plurality of first holes 21a along the first direction X overlaps with at least a portion of the projection of at least a portion of the second holes 22a in the plurality of second holes 22a, and there is a first adhesive 3 between the electrode terminal and the main body 223, the first adhesive 3 can overflow into the hole facing the electrode terminal during the process of bonding the pressure plate assembly 2 and the electrode terminal with the first adhesive 3. Thus, the situation of the first adhesive 3 overflowing into the hole facing the electrode terminal can be observed through another hole, which is beneficial to improving the bonding strength between the pressure plate assembly 2 and the battery cell assembly 10.

[0155] In some embodiments, such as Figure 4 As shown, the battery cell assembly 10 also includes a busbar 101, which is connected between the electrode terminal 12 and the main body 223 along the first direction X. A first adhesive 3 is provided between the busbar 101 and the main body 223.

[0156] The first adhesive 3 bonds the manifold 101 and the main body 223.

[0157] In the embodiments of this disclosure, since there is a first adhesive 3 between the manifold 101 and the main body 223, the first adhesive 3 can overflow into the hole facing the manifold 101 during the process of bonding the pressure plate assembly 2 and the manifold 101 with the first adhesive 3. Thus, the situation of the first adhesive 3 overflowing into the hole facing the manifold 101 can be observed through another hole, which is beneficial to improving the bonding strength between the pressure plate assembly 2 and the manifold 101.

[0158] In some embodiments, the busbar 101 in the same battery cell assembly 10 is connected to the same body portion 223.

[0159] Optionally, some or all of the busbars 101 in the same battery cell assembly 10 may be connected to the same main body 223.

[0160] In the embodiments of this disclosure, since the busbar 101 in the same battery cell assembly 10 is connected to the same main body 223, the busbar 101 in the same battery cell assembly 10 forms an integral whole, and the battery cell 1 connected to the busbar 101 can also form an integral whole. When the battery cell 1 in the battery cell assembly 10 thermally expands, the pressure plate assembly 2 can apply an anti-expansion force to the battery cell 1 in the battery cell assembly 10, reducing the probability of the battery cell 1 expanding. Moreover, the force on the battery cell 1 can be transmitted to other battery cells 1 through the pressure plate assembly 2, making the force on the battery cell assembly 10 more uniform and reducing the probability of stress concentration in the battery cell assembly 10.

[0161] In some embodiments, such as Figure 3 and Figure 4 As shown, along the first direction X, the second pressure plate 22 is located between the first pressure plate 21 and the battery cell assembly 10. Along the second direction Y, the protrusion 222 is located between the busbars 101 in two adjacent battery cell assemblies 10. The protrusion 222 abuts against the outer shell of the battery cell 1 in the two adjacent battery cell assemblies 10 along the second direction Y.

[0162] In some embodiments, at least two battery cell assemblies 10 include a first battery cell assembly and a second battery cell assembly that are adjacent along the second direction Y, and a common protrusion 222 abuts against both the first battery cell assembly and the second battery cell assembly. Further, the same protrusion 222 abuts against the shoulder of the first battery cell assembly near the second battery cell assembly and the shoulder of the second battery cell assembly near the first battery cell assembly. Here, the shoulder refers to the portion of the battery cell assembly 10 located on both sides of the busbar 101 along the second direction Y.

[0163] In the embodiments of this disclosure, since the protrusion abuts against the casing of the battery cell 1 in two adjacent battery cell assemblies 10 along the second direction Y, the protrusion can fix the relative position of the two adjacent battery cell assemblies 10 along the second direction Y, which facilitates easier assembly of the battery device 100. Furthermore, since the protrusion abuts against the casing of the battery cell 1 in two adjacent battery cell assemblies 10 along the second direction Y, the step of fixing the relative position between multiple battery cell assemblies 10 using components such as pressure strips can be eliminated. This not only reduces the number of components but also reduces the assembly steps of the battery device 100, thereby accelerating the production efficiency of the battery device 100.

[0164] In some embodiments, such as Figure 4 and Figure 10As shown, the battery cell assembly 10 includes a battery cell 1, which includes a housing 11, an electrode terminal 12 disposed on the housing 11, and an electrode assembly 13 located inside the housing 11 and electrically connected to the electrode terminal 12. Along the direction of gravity, the electrode terminal 12 is located below the electrode assembly 13, and the pressure plate assembly 2 is located below the electrode terminal 12.

[0165] In some embodiments, the battery device 100 is inverted, and the pressure plate assembly 2 is located below the busbar 101.

[0166] In the embodiments of this disclosure, since the electrode terminal 12 is located below the electrode assembly 13 and the pressure plate assembly 2 is located below the electrode terminal 12, the ability of the battery cell 1 to resist the impact of the bottom ball is improved. Therefore, even if a stone or a protrusion on the ground hits the battery device 100, the pressure plate assembly 2 can deform to absorb the impact force, thereby reducing the impact force transmitted to the battery cell assembly 10 and reducing the probability of deformation of the battery cell assembly 10 or misalignment of the components in the battery cell assembly within the housing 20.

[0167] In some embodiments, the housing 20 includes a first housing (not shown), electrode terminals facing the first housing along a first direction X, a second pressure plate 22 located between the first pressure plate 21 and the battery cell assembly along the first direction X, and the first housing and the first pressure plate 21 connected by a second adhesive (not shown).

[0168] The second adhesive bonds the first housing and the first pressure plate 21.

[0169] Alternatively, the second adhesive may be a structural adhesive.

[0170] In the embodiments of this disclosure, since there is a second adhesive between the first housing and the first pressure plate 21, the first housing, the first pressure plate 21 and the battery cell assembly 10 can be formed into a whole, thereby improving the overall mechanical strength of the battery device 100.

[0171] A second aspect of this application provides an electrical device that includes at least one of the aforementioned battery devices 100, which is used to store or provide electrical energy.

[0172] In the embodiments of this disclosure, since the electrical device includes at least one of the above-described battery devices 100, the probability of deformation of the battery cell assembly 10 within the housing 20 of the electrical device or misalignment of components within the battery cell assembly can be reduced.

[0173] A third aspect of this application provides a method for manufacturing a battery device 100. The battery device 100 includes a pressure plate assembly 2, a battery cell assembly 10, a busbar 101, and a housing 20. The pressure plate assembly 2 includes a first pressure plate 21 and a second pressure plate 22 connected to the first pressure plate 21 along a first direction X. The first direction X is the thickness direction of the first pressure plate 21. The first pressure plate 21 has a plurality of first holes 21a, and the second pressure plate 22 has a plurality of second holes 22a. The second pressure plate 22 includes a main body portion 223 and a protrusion 222 sequentially and alternately connected along a second direction Y. The main body portion 223 is connected to the first pressure plate 21 and along the first direction Y... To the X direction, the protrusion 222 protrudes away from the first pressure plate 21 relative to the main body 223, and the protrusion 222 and the first pressure plate 21 enclose a cavity 23. The second direction Y intersects the first direction X. The pressure plate assembly 2 and the battery cell assembly 10 are located inside the housing 20. The battery cell 1 includes a housing, electrode terminals disposed on the housing, and an electrode assembly 13 located inside the housing and electrically connected to the electrode terminals. The busbar 101 is electrically connected to the electrode terminals. The manufacturing method includes: bonding the pressure plate assembly 2 to the battery cell assembly 10 using a first adhesive 3. The first adhesive 3 is located outside the area between the busbars 101 of two adjacent battery cell assemblies 10.

[0174] In some embodiments, structural adhesive is applied to the side of the second housing 20b facing the battery cell assembly 10, and structural adhesive is applied to the side of the battery cell assembly 10 facing the second housing 20b to bond the battery cell assembly 10 to the second housing 20b. Structural adhesive is applied to the side of the busbar 101 connected to the battery cell assembly 10 away from the battery cell assembly 10 to bond the pressure plate assembly 2. Structural adhesive is applied to the side of the pressure plate assembly 2 away from the busbar 101 to bond the first housing, thereby forming a whole.

[0175] In the embodiments of this disclosure, since the first pressure plate 21 has a plurality of first holes 21a and the second pressure plate 22 has a plurality of second holes 22a, the pressure plate assembly 2 is bonded to the battery cell assembly 10 using the first adhesive 3. Therefore, the pressure plate assembly 2 can deform to absorb impact force, thereby reducing the impact force transmitted to the battery cell assembly 10 and lowering the probability of deformation of the battery cell assembly 10 or misalignment of components within the battery cell assembly. Moreover, since the first adhesive 3 is located outside the area between the busbars 101 of two adjacent battery cell assemblies 10, no adhesive is needed in the area between the busbars 101 of two adjacent battery cell assemblies 10, reducing the manufacturing steps of the battery device 100 and improving the production efficiency of the battery device 100.

[0176] In one specific embodiment, the pressure plate assembly 2 adopts a honeycomb panel with a honeycomb structure in the middle, which not only reduces the weight of the pressure plate assembly 2, but also improves its strength. Actual data shows that the weight of the all-aluminum honeycomb panel is only 30% to 40% of that of traditional panels, but it can withstand 2 to 3 times more pressure.

[0177] In one specific embodiment, array-shaped openings are made on the pressure plate assembly 2, and the impact force in the direction of gravity is absorbed through the honeycomb structure in the middle. At the same time, the production process is simplified. The shoulder of the battery cell assembly 10 does not need to be coated with structural adhesive and the shoulder does not need to be installed with pressure strips. After applying structural adhesive above the busbar 101, the pressure plate assembly 2 is bonded. This not only improves the overall structure of the battery device 100, but also absorbs energy.

[0178] In one specific embodiment, the pressure plate assembly 2 is made entirely of lightweight aluminum alloy. The pressure plate assembly 2 consists of two layers of aluminum alloy plates. The first layer of aluminum alloy plate (second pressure plate 22) has arrayed second holes 22a with a diameter of approximately 30 mm, and the second layer of aluminum alloy plate (first pressure plate 21) has first holes 21a with a diameter of approximately 35 mm. The small and dense second holes 22a primarily increase the bonding area between the manifold 101 and the pressure plate assembly 2 when bonded to the manifold 101. The large and sparse first holes 21a primarily absorb impact forces.

[0179] In some embodiments, the battery device 100 is inverted, and the pressure plate assembly 2 is bonded to the busbar 101 but not to the shoulder of the battery cell assembly 10, reducing one structural adhesive application process and lowering manufacturing costs.

[0180] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. A battery device, characterized in that, include: Box; The battery cell assembly is located inside the housing; A pressure plate assembly is located inside the housing and is connected to one end of the battery cell assembly along a first direction. The pressure plate assembly includes a first pressure plate and a second pressure plate connected to the first pressure plate along one side of the first direction, where the first direction is the thickness direction of the first pressure plate. The first pressure plate has a plurality of first holes, and the second pressure plate has a plurality of second holes. The second pressure plate includes a main body and a protrusion that are alternately connected in sequence along a second direction. The main body is connected to the first pressure plate. Along the first direction, the protrusion protrudes away from the first pressure plate relative to the main body. The protrusion and the first pressure plate enclose a cavity. The second direction intersects the first direction. The first aperture is located at the connection between the first pressure plate and the main body, and the second aperture is located on the main body. Projected along the first direction, at least a portion of the projections of the first apertures overlap with at least a portion of the projections of the second apertures. The battery cell assembly includes a battery cell, the battery cell including a housing, electrode terminals disposed in the housing, and an electrode assembly located inside the housing and electrically connected to the electrode terminals. The electrode terminals are connected to the main body, and a first adhesive is provided between the electrode terminals and the main body.

2. The battery device according to claim 1, characterized in that, Along the first direction, the pressure plate assembly and the battery cell assembly have a first adhesive; Projecting along the first direction, the projection of at least a portion of the first pores overlaps with the projection of at least a portion of the second pores.

3. The battery device according to claim 2, characterized in that, Along the first direction, the second pressure plate is located between the first pressure plate and the battery cell assembly, and the diameter of the first pore is larger than the diameter of the second pore.

4. The battery device according to claim 3, characterized in that, The diameter of the first pore is in the range of 35 mm to 45 mm.

5. The battery device according to claim 3, characterized in that, The diameter of the second pore is in the range of 30 mm to 40 mm.

6. The battery device according to claim 2, characterized in that, When projected along the first direction, the ratio of the total projected area of ​​the plurality of first pores to the total projected area of ​​the plurality of second pores is in the range of 45% to 65%.

7. The battery device according to claim 2, characterized in that, The plurality of first pores are arranged in a matrix, and / or the plurality of second pores are arranged in a matrix.

8. The battery device according to claim 1, characterized in that, The battery cell assembly also includes: A busbar, along the first direction, is connected between the electrode terminal and the main body, and the busbar and the main body have the first adhesive between them.

9. The battery device according to claim 8, characterized in that, The busbar in the same battery cell assembly is connected to the same main body.

10. The battery device according to claim 8, characterized in that, Along the first direction, the second pressure plate is located between the first pressure plate and the battery cell assembly; along the second direction, the protrusion is located between the busbars in two adjacent battery cell assemblies. The protrusion abuts against the housing of one of the two adjacent battery cell assemblies along the second direction.

11. The battery device according to any one of claims 1 to 7, characterized in that, The battery cell assembly includes a battery cell, the battery cell including a housing, electrode terminals disposed in the housing, and an electrode assembly located inside the housing and electrically connected to the electrode terminals. Along the direction of gravity, the electrode terminals are located below the electrode assembly, and the pressure plate assembly is located below the electrode terminals.

12. The battery device according to claim 11, characterized in that, The housing includes a first housing, the electrode terminals are oriented toward the first housing along the first direction, the second pressure plate is located between the first pressure plate and the battery cell assembly along the first direction, and the first housing and the first pressure plate are connected by a second adhesive.

13. An electrical appliance, characterized in that, It includes at least one battery device according to any one of claims 1 to 12, the battery device being used to store or provide electrical energy.

14. A method for manufacturing a battery device, characterized in that, The battery device includes a pressure plate assembly, a battery cell assembly, a busbar, and a housing. The pressure plate assembly includes a first pressure plate and a second pressure plate connected to the first pressure plate along a first direction, where the first direction is the thickness direction of the first pressure plate. The first pressure plate has a plurality of first holes, and the second pressure plate has a plurality of second holes. The second pressure plate includes a main body and a protrusion connected alternately along a second direction. The main body is connected to the first pressure plate. Along the first direction, the protrusion protrudes away from the first pressure plate relative to the main body, and the protrusion and the first pressure plate enclose a cavity. The second direction intersects the first direction. A pore is provided at the connection between the first pressure plate and the main body, and a second pore is provided on the main body. Projected along the first direction, the projections of at least a portion of the first pores overlap with at least a portion of the projections of at least a portion of the second pores. The pressure plate assembly and the battery cell assembly are located inside the housing. The battery cell includes a housing, electrode terminals disposed on the housing, and an electrode assembly located inside the housing and electrically connected to the electrode terminals. The busbar is electrically connected to the electrode terminals and connected to the main body, and a first adhesive is present between the busbar and the main body. The manufacturing method includes: The pressure plate assembly and the battery cell assembly are bonded together along the first direction using a first adhesive, wherein the first adhesive is located outside the area between the busbars of two adjacent battery cell assemblies.

Images