Battery device, manufacturing method thereof and electric device

Abstract

The invention provides a battery device, a manufacturing method thereof and a power utilization device. Relates to the technical field of batteries. The battery device includes: a case; the battery monomer assembly is positioned in the box body; the pressing plate assembly is located in the box body, the pressing plate assembly is connected to one end, in the first direction, of the battery monomer assembly, the pressing plate assembly comprises a first pressing plate and a second pressing plate connected to one side, in the first direction, of the first pressing plate, the first direction is the thickness direction of the first pressing plate, and a plurality of first holes are formed in the first pressing plate; a plurality of second holes are formed in the second pressing plate, the second pressing plate comprises a main body part and a protruding part which are sequentially and alternately connected in the second direction, the main body part is connected with the first pressing plate, in the first direction, the protruding part protrudes away from the first pressing plate relative to the main body part, the protruding part and the first pressing plate define a cavity, and the second direction intersects with the first direction. Therefore, external impact vibration is relieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and a manufacturing method thereof, and an electrical device. Background Art

[0002] New energy batteries are increasingly being used in everyday life and industry. For example, battery-powered new energy vehicles are already widely used. Furthermore, battery devices are increasingly being used in energy storage and other applications. In new energy vehicles, battery devices can provide full or partial power. In energy storage, battery devices can be installed in energy storage boxes or directly at the user's side.

[0003] In the related art, a battery device includes a housing and a battery cell assembly located inside the housing. When the battery device is subjected to an impact, the battery cell assembly inside the housing may be deformed or components in the electrode assembly may be misaligned. Summary of the Invention

[0004] To solve the above technical problems, embodiments of the present application provide a battery device and a manufacturing method thereof, as well as an electrical device to alleviate external impact and vibration.

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

[0006] The first aspect of the present application provides a battery device, which includes: a box body; a battery cell assembly located in the box body; a pressure plate assembly located in the box body, the pressure plate assembly being connected to one end of the battery cell assembly along a first direction, the pressure plate assembly including a first pressure plate and a second pressure plate connected to the first pressure plate on one side along the first direction, the first direction being the thickness direction of the first pressure plate, the first pressure plate forming a plurality of first pores, the second pressure plate forming a plurality of second pores, the second pressure plate including a main body and a protrusion connected alternately in sequence along the second direction, the main body being connected to the first pressure plate, and the protrusion protruding away from the first pressure plate relative to the main body along the first direction, the protrusion and the first pressure plate enclosing a cavity, and the second direction intersecting with the first direction.

[0007] Because the first pressure plate is formed with multiple first apertures and the second pressure plate is formed with multiple second apertures, when the battery device is subjected to an impact (e.g., a bottom ball impact), the sidewalls of the first pressure plate with the multiple first apertures and the sidewalls of the second pressure plate with the multiple second apertures 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 within the casing or misalignment of components within the battery cell assembly, and alleviating external impact vibration. Because the protrusion and the first pressure plate enclose a cavity that absorbs energy, the pressure plate assembly can absorb more impact force, reducing the impact force transmitted to the battery cell assembly, reducing the probability of deformation of the battery cell assembly within the casing or misalignment of components within the battery cell assembly, and alleviating external impact vibration.

[0008] In some embodiments, along the first direction, there is a first adhesive between the pressure plate assembly and the battery cell assembly; projected along the first direction, the projection of at least part of the multiple first pores and the projection of at least part of the multiple second pores at least partially overlap.

[0009] Since the projections of at least part of the multiple first pores and the projections of at least part of the multiple second pores overlap at least partially when projected along the first direction, in the process of bonding the pressure plate assembly and the battery cell assembly using the first adhesive, the first adhesive can overflow into the pores facing the battery cell assembly. 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 the first direction, the second pressing plate is located between the first pressing plate and the battery cell assembly, and a diameter of the first pore is greater than a diameter of the second pore.

[0011] Since the diameter of the first pore is larger than that of the second pore, the diameter of the second pore is smaller, and the bonding area between the second pressure plate and the battery cell assembly is larger, thereby improving the bonding strength between the second pressure plate and the battery cell assembly; the diameter of the first pore is larger, therefore, not only can the weight of the first pressure plate be reduced, thereby improving the lightweight of the battery device, but also the larger diameter of the first pore is conducive to the first pressure plate absorbing 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 in the box or dislocation of components in the battery cell assembly, and further alleviating external impact vibration.

[0012] In some embodiments, the diameter of the first aperture 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, thereby improving 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 in the box or dislocation of components in the battery cell assembly, and further alleviate external impact vibration.

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

[0015] Since the diameter of the second pore is in the range of 30 mm to 40 mm, both the energy absorption effect of the second pore and the bonding strength between the second pressing plate and the battery cell assembly can be taken into consideration.

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

[0017] Since the ratio of the total projected area of ​​the multiple first pores to the total projected area of ​​the multiple second pores when projected along the first direction is in the range of 45% to 65%, it is possible to take into account both 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, the plurality of first pores are arranged in a matrix, and / or the plurality of second pores are arranged in a matrix.

[0019] Because the multiple first pores are arranged in a matrix, they are evenly distributed within the first pressure plate, resulting in more uniform energy absorption at all locations within the first pressure plate, which facilitates more effective energy absorption by the first pressure plate. Because the multiple second pores are arranged in a matrix, they are evenly distributed within the second pressure plate, which facilitates a stronger bond between the second pressure plate and the battery cell assembly.

[0020] In some embodiments, the first pore is provided at the connection portion between the first pressure plate and the main body, the second pore is provided in the main body, and projected along the first direction, the projection of at least part of the multiple first pores overlaps with the projection of at least part of the multiple second pores. The battery cell assembly includes a battery cell, the battery cell includes a shell, an electrode terminal provided on the shell, and an electrode assembly located in the shell and electrically connected to the electrode terminal, the electrode terminal is connected to the main body, and a first adhesive is present between the electrode terminal and the main body.

[0021] Since, when projected along the first direction, the projections of at least part of the multiple first pores overlap at least partially with the projections of at least part of the second pores among the multiple second pores, and there is a first adhesive between the electrode terminal and the main body, therefore, in the process of bonding the pressure plate assembly and the electrode terminal using the first adhesive, the first adhesive can overflow into the pores facing the electrode terminal. Thus, the overflow of the first adhesive into the pores facing the electrode terminal 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, wherein the busbar is connected between the electrode terminal and the main body along the first direction, and a first adhesive is provided between the busbar and the main body.

[0023] Since there is a first adhesive between the busbar and the main body, during the process of using the first adhesive to bond the pressure plate assembly and the busbar, the first adhesive can overflow into the pores facing the busbar. Therefore, the situation of the first adhesive overflowing into the pores facing the busbar can be observed through another pore, which is beneficial to improving the bonding strength between the pressure plate assembly and the busbar.

[0024] In some embodiments, the busbars in the same battery cell assembly are connected to the same main 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. In the case of thermal expansion of the battery cells in the battery cell assembly, the pressure plate assembly can apply anti-expansion force to the battery cells in the battery cell assembly, reducing the probability of battery cell expansion, and the force exerted on the battery cells can be transmitted to other battery cells through the pressure plate assembly, so that the force on the battery cell assembly is more uniform, 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, along the second direction, the protrusion is located between the busbars in two adjacent battery cell assemblies, and the protrusion abuts against the outer shells of the battery cells in the two adjacent battery cell assemblies along the second direction.

[0027] Because the protrusion abuts the outer shells of the battery cells in two adjacent battery cell assemblies along the second direction, the protrusion can fix the relative position of the two adjacent battery cell assemblies along the second direction, facilitating easier assembly of the battery device. Furthermore, the protrusion abuts the outer shells of the battery cells in two adjacent battery cell assemblies along the second direction, thereby eliminating the need to use components such as pressure strips to fix the relative positions of multiple battery cell assemblies. This not only reduces the number of components but also reduces the number of assembly steps for the battery device, thereby facilitating faster production of the battery device.

[0028] In some embodiments, the battery cell assembly includes a battery cell, the battery cell includes a shell, an electrode terminal provided on the shell, and an electrode assembly located in the shell and electrically connected to the electrode terminal. Along the direction of gravity, the electrode terminal is located below the electrode assembly, and the pressure plate assembly is located below the electrode terminal.

[0029] Since the electrode terminal is located below the electrode assembly and the pressure plate assembly is located below the electrode terminal, the ability of the battery cell to resist the impact of the bottom ball is improved. Therefore, even if stones splashed from the ground or protrusions on the ground hit the battery device, the pressure plate assembly can deform to absorb the impact force, so as to reduce the impact force transmitted to the battery cell assembly, reduce the probability of deformation of the battery cell assembly in the box or dislocation of components in the battery cell assembly, and alleviate external impact vibration.

[0030] In some embodiments, the box includes a first box, the electrode terminal faces the first box along a first direction, the second pressing plate is located between the first pressing plate and the battery cell assembly along the first direction, and the first box and the first pressing plate are connected by a second adhesive.

[0031] Since the second adhesive is provided between the first box and the first pressing plate, the first box, the first pressing plate and the battery cell assembly can be formed into a whole, thereby improving the overall mechanical strength of the battery device.

[0032] A second aspect of the present application provides an electrical device, which includes at least one battery device as described above, and the battery device is used to store or provide electrical energy.

[0033] Since the electrical device includes at least one of the above-mentioned battery devices, the probability of deformation of the battery cell assembly in the box of the electrical device or misalignment of components in the battery cell assembly can be reduced, thereby alleviating external impact and vibration.

[0034] The third aspect of the present application provides a method for manufacturing a battery device, the battery device including a pressure plate assembly, a battery cell assembly, a busbar and a box body, the pressure plate assembly including a first pressure plate and a second pressure plate connected to the first pressure plate on one side along a first direction, the first direction being the thickness direction of the first pressure plate, the first pressure plate forming a plurality of first pores, the second pressure plate forming a plurality of second pores, the second pressure plate including a main body portion and a protrusion portion alternately connected in sequence along a second direction, the main body portion being 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, the protrusion portion and the first pressure plate enclose forming a cavity, the second direction intersects with the first direction, the pressure plate assembly and the battery cell assembly are located in the box body, the battery cell includes an outer shell, an electrode terminal provided in the outer shell and an electrode assembly located in the outer shell and electrically connected to the electrode terminal, the busbar is electrically connected to the electrode terminal, and the manufacturing method includes: using a first adhesive to bond the pressure plate assembly to the battery cell assembly, the first adhesive being located outside the area between the busbars of two adjacent battery cell assemblies.

[0035] Because the first pressing plate is formed with a plurality of first apertures and the second pressing plate is formed with a plurality of second apertures, the pressing plate assembly is bonded to the battery cell assembly using a first adhesive. Thus, the pressing plate assembly can deform to absorb impact force, thereby reducing the impact force transmitted to the battery cell assembly and lowering the probability of deformation of the battery cell assembly within the housing or misalignment of components within the battery cell assembly. Furthermore, because the first adhesive is located outside the region between the current collectors of two adjacent battery cell assemblies, no adhesive need be applied to the region between the current collectors of two adjacent battery cell assemblies, reducing the number of manufacturing steps for the battery assembly and facilitating efficient production of the battery assembly.

[0036] Advantageous effects of the embodiments of the present application include: being able to alleviate external impact vibrations of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings: Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application; Figure 2 A schematic diagram of a portion of the structure of a battery device provided in some embodiments of the present application; Figure 3 A schematic diagram of a partial structure of a battery device from another angle provided in some embodiments of the present application; Figure 4 for Figure 3 A1 area enlarged schematic diagram; Figure 5 A schematic structural diagram of a pressure plate assembly provided in some embodiments of the present application; Figure 6 for Figure 5 A magnified schematic diagram of the B1 area; Figure 7 A schematic structural diagram of a pressure plate assembly from another angle provided for some embodiments of the present application; Figure 8 for Figure 7 Schematic diagram of the C1 region; Figure 9 A schematic structural diagram of a pressure plate assembly from another angle provided in some embodiments of the present application; Figure 10 A schematic exploded perspective view of a battery cell provided in some embodiments of the present application.

[0038] Description of Reference Numerals 1000, vehicle; 100, battery device; 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 pore; 22, second pressure plate; 22a, second pore; 222, protrusion; 2221, first protruding section; 22211, protruding main body; 22212, protruding protrusion; 2222, second protruding section; 223, main body; 23, cavity; 3, first adhesive; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0041] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0042] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0044] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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 understood as limitations on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0047] Below, this application is described in detail.

[0048] In the related art, a battery device includes a housing and a battery cell assembly located within the housing. When the battery device is used in an automobile, the battery device is usually installed on the chassis of the automobile. In addition, during the driving of the vehicle, the battery device installed on the chassis may be impacted from below by hard objects such as stones splashed from the road surface, or may be bumped by protruding structures on the ground. These impacts from below the battery device are collectively referred to as bottom ball impacts. When the battery device is impacted by a bottom ball, the impact force acting on the housing will be transmitted to the battery cell assembly, causing the battery cell assembly to be easily deformed or the components in the battery cell assembly to be easily misaligned. According to research, in order to reduce the probability of deformation of the battery cell assembly in the housing or misalignment of the components in the battery cell assembly, a pressure plate assembly can be set between the battery cell assembly and the housing. The pressure plate assembly can absorb energy, thereby reducing the impact force transmitted to the battery cell assembly, thereby reducing the probability of deformation of the battery cell assembly in the housing or misalignment of the components in the battery cell assembly.

[0049] Based on such a design concept, an embodiment of the present application provides a battery device, which includes: a box body; a battery cell assembly, located in the box body; a pressure plate assembly, located in the box body, 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 on one side along the first direction, the first direction is the thickness direction of the first pressure plate, the first pressure plate is formed with a plurality of first pores, the second pressure plate is formed with a plurality of second pores, the second pressure plate includes a main body and a protrusion connected alternately in sequence along the second direction, the main body is connected to the first pressure plate, and 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, and the second direction intersects with the first direction.

[0050] Because the first pressure plate is formed with multiple first apertures and the second pressure plate is formed with multiple second apertures, if the battery device is subjected to an impact (e.g., a bottom ball impact), the sidewalls of the first pressure plate with the multiple first apertures and the sidewalls of the second pressure plate with the multiple second apertures can deform to absorb the impact force, thereby reducing the impact force transmitted to the battery cell assembly and reducing the probability of deformation of the battery cell assembly within the casing or misalignment of components within the battery cell assembly. Because the protrusion and the first pressure plate enclose a cavity that absorbs energy, the pressure plate assembly can absorb more impact force, reducing the impact force transmitted to the battery cell assembly, reducing the probability of deformation of the battery cell assembly within the casing or misalignment of components within the battery cell assembly, and alleviating external impact vibration.

[0051] The battery cells and battery devices provided in the embodiments of the present application can be used, but are not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0052] The present application also provides an electrical device including the battery device described above. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0053] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as an example of a vehicle 1000 .

[0054] Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is installed inside vehicle 1000. Battery device 100 can be installed at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as an operating power source for vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery device 100 to power motor 300, for example, to meet the power requirements of vehicle 1000 during startup, navigation, and driving.

[0055] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0056] Figure 2 This is a partial structural diagram of a battery device provided in some embodiments of the present application. The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 (Battery Cell Assembly) may include multiple battery cells 1, which may be connected in series, parallel, or hybrid via a busbar.

[0057] In some embodiments, a battery cell assembly 10 is typically formed by arranging multiple battery cells 1. For example, the battery cell assembly 10 may be a battery module, which is formed by arranging and securing multiple battery cells 1 to form a single module. For example, a battery module may be formed by bundling multiple battery cells 1 together using cable ties.

[0058] In some embodiments, the battery device 100 may be a battery pack, which includes a case and one or more battery cell assemblies 10 , wherein the battery cell assemblies 10 are housed in the case.

[0059] As an example, the battery cell assembly 10 may be a battery module, and the battery cell assembly 10 may be accommodated in a box by fixing the battery module in the box.

[0060] As an example, the battery cell assembly 10 may also be housed in the box body 20 by directly fixing the plurality of battery cells 1 to the box body 20 .

[0061] As an example, the housing 20 may include a first housing (not shown) and a second housing 20b. The first housing 20b and the second housing 20b are fastened together to form a closed space inside the housing 20 to accommodate the battery cell 1 assembly. Enclosed here means covered or closed, and may 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 the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after the battery cell 1 is discharged and can continue to be used.

[0062] The battery cell 1 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 storage battery, etc., which is not limited in the embodiment of the present application.

[0063] The battery cell 1 generally includes an electrode assembly 13 (see Figure 10 The electrode assembly 13 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0064] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0065] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0066] In some embodiments, the electrode assembly 13 further includes a separator, which is disposed between the positive electrode and the negative electrode.

[0067] In some embodiments, the separator is a separator. The present invention has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be used.

[0068] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present invention does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0069] In some embodiments, the electrode assembly 13 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0070] In some embodiments, the electrode assembly 13 is a laminated structure.

[0071] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0072] As an example, multiple separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0073] In some embodiments, the shape of the electrode assembly 13 can be cylindrical, flat, or polygonal.

[0074] 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.

[0075] In some embodiments, the battery cell 1 may include a housing 11. Housing 11 is used to encapsulate components such as the electrode assembly 13 and the electrolyte. Housing 11 may be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film.

[0076] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in the embodiments of the present application.

[0077] In some embodiments, as Figure 10As shown, the housing 11 includes an end cap assembly and a shell. The shell has an opening, and the end cap assembly closes the opening to form a sealed space for accommodating the electrode assembly 13 and electrolyte and other substances. The shell may have one or more openings. One or more end cap assemblies may also be provided.

[0078] 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 indirectly connected to the tab via an adapter component. The electrode terminal 12 can be provided on the end cap assembly or on the housing.

[0079] In some embodiments, a pressure relief mechanism is provided on the housing 11 to release the internal pressure of the battery cell 1 .

[0080] Below, refer to Figures 2 to 10 Some embodiments of the present application are described in detail.

[0081] In the description of the embodiments of the present disclosure, for ease of explanation, the direction indicated by arrow X represents the "first direction," the direction indicated by arrow Y represents the "second direction," and the direction indicated by arrow Z represents the "third direction." The first direction X, the second direction Y, and the third direction Z intersect with 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.

[0082] The first aspect of the present application provides a battery device 100, such as Figures 2 to 9 As 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 within the housing 20. The pressure plate assembly 2 is located within 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 on one side along the first direction X. The first direction X is the thickness direction of the first pressure plate 21. The first pressure plate 21 is formed with a plurality of first apertures 21a, and the second pressure plate 22 is formed with a plurality of second apertures 22a.

[0083] The battery cell assembly 10 includes a plurality of battery cells 1, each of which includes a housing 11 and electrode terminals 12 disposed thereon. Optionally, the pressure plate assembly 2 may be connected to a housing wall of the housing where the electrode terminals are disposed, or to a housing wall where no electrode terminals are disposed.

[0084] Optionally, the battery cell assembly 10 can be directly connected to the pressure plate assembly 2, for example, by directly bonding with a structural adhesive; Figure 4As 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, wherein the pressure plate assembly 2 and the busbar 101 can be bonded by structural adhesive.

[0085] In some embodiments, as Figure 2 As shown, the battery cell assembly 10 includes multiple battery cells 1 arranged along the third direction Z, the large surface of the battery cell 1 is perpendicular to the third direction Z, and the "large surface" refers to the surface with the largest outer surface area 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.

[0086] In some embodiments, the pressure plate assembly 2 extends along the third direction Z.

[0087] In some embodiments, the pressing plate assembly 2 is made of aluminum alloy.

[0088] Optionally, the first pressing plate 21 may be connected between the second pressing plate 22 and the battery cell assembly 10 , or the second pressing plate 22 may be connected between the first pressing plate 21 and the battery cell assembly 10 .

[0089] Alternatively, as Figure 5 and Figure 6 As shown, the first pressing plate 21 may be formed with two, three, four or five first apertures 21 a.

[0090] Optionally, when projected along the first direction X, the shape of the projection of the first pore 21 a may be a regular or irregular shape such as a circle, a triangle, or a hexagon.

[0091] Optionally, the shapes and sizes of the plurality of first pores 21 a may be the same or different; and the distances between adjacent first pores 21 a may be equal or different.

[0092] For example, the first pressure plate 21 is configured as a honeycomb structure.

[0093] Alternatively, as Figure 7 and Figure 8 As shown, the second pressing plate 22 may be formed with two, three, four or five second apertures 22 a.

[0094] Optionally, when projected along the first direction X, the shape of the projection of the second pore 22a may be a regular or irregular shape such as a circle, a triangle, or a hexagon.

[0095] Optionally, the shapes and sizes of the plurality of second pores 22a may be the same or different; and the distances between adjacent second pores 22a may be equal or different.

[0096] For example, the second pressure plate 22 is configured as a honeycomb structure.

[0097] In the embodiment of the present disclosure, since the first pressure plate 21 is formed with a plurality of first pores 21 a and the second pressure plate 22 is formed with a plurality of second pores 22 a, when the battery device 100 is subjected to an impact (for example, a bottom ball impact), the side wall of the first pressure plate 21 formed with the plurality of first pores 21 a and the side wall of the second pressure plate 22 formed with the plurality of second pores 22 a 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 in the box body 20 or misalignment of components in the battery cell assembly 10.

[0098] In some embodiments, along the first direction X, there is a first adhesive 3 between the pressure plate assembly 2 and the battery cell assembly 10; projected along the first direction X, the projection of at least part of the first pores 21a in the plurality of first pores 21a at least partially overlaps with the projection of at least part of the second pores 22a in the plurality of second pores 22a.

[0099] The first adhesive 3 is applied to the battery cell assembly 10 , and then the press plate assembly 2 is adhered to the battery cell assembly 10 .

[0100] Optionally, the first adhesive 3 may be a structural adhesive.

[0101] Optionally, when projected along the first direction X, the projection of a portion of the first pores 21a may overlap with the projection of a portion of the second pores 22a; when projected along the first direction X, the projection of all the first pores 21a may overlap with the projection of a portion of the second pores 22a; when projected along the first direction X, the projection of a portion of the first pores 21a may overlap with the projection of all the second pores 22a; when projected along the first direction X, the projection of all the first pores 21a may overlap with the projection of all the second pores 22a.

[0102] Optionally, when projected along the first direction X, part of the projection of the first pore 21a may overlap with part of the projection of the second pore 22a; when projected along the first direction X, the entire projection of the first pore 21a may overlap with part of the projection of the second pore 22a; when projected along the first direction X, part of the projection of the first pore 21a may overlap with the entire projection of the second pore 22a; when projected along the first direction X, the entire projection of the first pore 21a may overlap with the entire projection of the second pore 22a.

[0103] In the embodiment of the present disclosure, since the projections of at least part of the multiple first pores 21a and the projections of at least part of the second pores 22a in the multiple second pores 22a overlap at least partially when projected along the first direction X, in the process of bonding the pressure plate assembly 2 and the battery cell assembly 10 using the first adhesive 3, the first adhesive 3 can overflow into the pores facing the battery cell assembly 10. Thus, the overflow of the first adhesive 3 into the pores facing the battery cell assembly 10 can be observed through another pore, which is beneficial to improving the bonding strength between the pressure plate assembly 2 and the battery cell assembly 10.

[0104] It can be understood that, when projected along the first direction X, the projection of the first pore 21 a and the projection of the second pore 22 a may be staggered, that is, they may not overlap.

[0105] In some embodiments, as Figure 4 、 Figure 6 and Figure 8 As shown, along the first direction X, the second pressing plate 22 is located between the first pressing plate 21 and the battery cell assembly 10 , and the diameter D1 of the first pore 21 a is greater than the diameter D2 of the second pore 22 a .

[0106] The diameter D1 of the first pore 21a refers to the diameter of the projection of the first pore 21a when the projection of the first pore 21a is circular, or the diameter of the inscribed circle of the projection of the first pore 21a when the projection of the first pore 21a is non-circular, for example, when the projection of the first pore 21a is hexagonal, the diameter of the inscribed circle of the projection of the first pore 21a, that is, Figure 6 The diameter of the dashed circle shown.

[0107] The diameter D2 of the second pore 22a refers to the diameter of the projection of the second pore 22a when the projection of the second pore 22a is circular, or the diameter of the inscribed circle of the projection of the second pore 22a when the projection of the second pore 22a is non-circular, for example, when the projection of the second pore 22a is hexagonal, the diameter of the inscribed circle of the projection of the second pore 22a, that is, Figure 8 The diameter of the dashed circle shown.

[0108] Optionally, the diameter D1 of some of the first pores 21 a may be larger than the diameter D2 of all the second pores 22 a , or the diameter D1 of all the first pores 21 a may be larger than the diameter D2 of all the second pores 22 a .

[0109] In the embodiment of the present 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, and the bonding area between the second pressure plate 22 and the battery cell assembly 10 is larger, thereby improving the bonding strength between the second pressure plate 22 and the battery cell assembly 10; the diameter D1 of the first pore 21a is larger, therefore, not only can the weight of the first pressure plate 21 be reduced, thereby improving the lightweight of the battery device 100, but also the larger diameter of the first pore 21a is conducive to the first pressure plate 21 absorbing 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 in the box 20 or dislocation of components in the battery cell assembly.

[0110] It is understood that the diameter D1 of the first pore 21 a may be smaller than or equal to the diameter D2 of the second pore 22 a .

[0111] In some embodiments, as Figure 6 As shown, the diameter D1 of the first aperture 21a is in the range of 35 mm to 45 mm.

[0112] Optionally, the diameter D1 of the first pores 21a can be 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, or 45 mm, or a value between any two of the above values. The diameters D1 of different first pores 21a can be equal or different.

[0113] In the embodiment of the present disclosure, since the diameter of the first pore 21a is in the range of 35 mm to 45 mm, it can not only reduce the weight of the first pressure plate 21, thereby improving 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 in the box 20 or misalignment of components in the battery cell assembly.

[0114] It is understood that the diameter D1 of the first pore 21 a may be smaller than 35 mm or larger than 45 mm.

[0115] In some embodiments, as Figure 8 As shown, the diameter of the second aperture 22a is in the range of 30 mm to 40 mm.

[0116] Optionally, the diameter D2 of the second pores 22a can be 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, or 40 mm, or a value between any two of the above values. The diameters D2 of different second pores 22a can be equal or different.

[0117] In the embodiment of the present disclosure, since the diameter of the second pore 22 a is in the range of 30 mm to 40 mm, both the energy absorption effect of the second pore 22 a and the bonding strength between the second pressing plate 22 and the battery cell assembly 10 can be taken into consideration.

[0118] It is understood that the diameter D2 of the second pore 22a may be less than 30 mm or greater than 40 mm.

[0119] In some embodiments, projected along the first direction X, a ratio of a total area of ​​the projections of the plurality of first apertures 21 a to a total area of ​​the projections of the plurality of second apertures 22 a is in a range of 45% to 65%.

[0120] Projected along the first direction X, a ratio of the sum of the projected areas of all the first pores 21 a to the sum of the projected areas of all the second pores 22 a is in a range of 45% to 65%.

[0121] Optionally, projected along the first direction X, the ratio of the total area of ​​the projections of the plurality of first pores 21a to the total area of ​​the projections of the plurality of second pores 22a can be 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, etc., and of course, it can also be a value between any two of the above values.

[0122] In the embodiment of the present disclosure, due to the projection along the first direction X, the ratio of the total projected area of ​​the multiple first pores 21a to the total projected area of ​​the multiple second pores 22a is in the range of 45% to 65%. Therefore, 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 can be taken into account.

[0123] It can be understood that, projected along the first direction X, the ratio of the total area of ​​the projections of the plurality of first pores 21 a to the total area of ​​the projections of the plurality of second pores 22 a may be less than 45% or greater than 65%.

[0124] In some embodiments, the plurality of first pores 21 a are arranged in a matrix, and / or the plurality of second pores 22 a are arranged in a matrix.

[0125] In some embodiments, the plurality of first pores 21 a are arranged in a matrix.

[0126] In some embodiments, the plurality of second pores 22a are arranged in a matrix.

[0127] In some embodiments, the plurality of first pores 21 a are arranged in a matrix, and the plurality of second pores 22 a are arranged in a matrix.

[0128] In the embodiment of the present disclosure, since the plurality of first pores 21a are arranged in a matrix, the first pores 21a are distributed relatively evenly within the first pressure plate 21, resulting in a more uniform energy absorption effect at each position within the first pressure plate 21, which facilitates more effective energy absorption by the first pressure plate 21. Since the plurality of second pores 22a are arranged in a matrix, the second pores 22a are distributed relatively evenly within the second pressure plate 22, which facilitates a stronger bond between the second pressure plate 22 and the battery cell assembly 10.

[0129] It is understandable that the plurality of first pores 21a may not be arranged in a matrix, and the plurality of first pores 21a may not be arranged in a matrix.

[0130] In some embodiments, as Figure 4 As shown, the second pressure plate 22 includes a main body 223 and a protrusion 222 alternately connected in sequence 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, and the second direction Y intersects with the first direction X.

[0131] In some embodiments, the surface of the main body 223 facing the first pressing plate 21 along the first direction X is a flat surface, thereby facilitating improved bonding strength between the first pressing plate 21 and the main body 223. Of course, the surface of the main body 223 facing the first pressing plate 21 along the first direction X is a slightly curved surface.

[0132] Optionally, when projected along the third direction Z, the projection of the cavity 23 may be a regular or irregular shape such as a trapezoid or a rectangle.

[0133] In some embodiments, the protrusion 222 includes a first protrusion section 2221 and a second protrusion section 2222 connected to one side of the first protrusion section 2221 along the second direction Y. The first protrusion section 2221 is opposite to the first pressing plate 21 along the first direction X, and the second protrusion section 2222 connects the first protrusion section 2221 and the main body 223. Furthermore, the further away from the first protrusion section 2221, the smaller the distance between the second protrusion section 2222 and the first pressing plate 21 along the first direction X. The number of the second protrusion sections 2222 is two, such as Figure 4 As shown, the two second protruding sections 2222 are respectively located on the left and right sides of the first protruding section 2221 .

[0134] In some embodiments, the first protruding section 2221 is bonded to the busbar 101 .

[0135] In some embodiments, as Figure 4As shown, the first protruding section 2221 includes a protruding main body 22211 and a protruding projection 22212 connected to the protruding main body 22211 and facing the battery cell assembly 10 along the first direction X. The protruding projection 22212 abuts against the battery cell assembly 10 .

[0136] Illustratively, the protruding projection 22212 abuts against the busbar.

[0137] In some embodiments, the number of the protruding portions 22212 in the same first protruding section 2221 is at least two, and both ends of the protruding main body portion 22211 along the second direction Y are provided with a protruding portion 22212 .

[0138] In some embodiments, the protruding protrusion 22212 may extend along the third direction Z.

[0139] In the embodiment of the present disclosure, since the protrusion 222 and the first pressure plate 21 enclose 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 in the box body 20 or misalignment of components in the battery cell assembly.

[0140] In some embodiments, as Figures 4 to 6 As shown, the first pore 21a is provided at the connection portion between the first pressing plate 21 and the main body 223, as shown in FIG. Figure 7 and Figure 8 As shown, the second pores 22a are provided in the main body 223, and along the first direction X, the projections of at least some of the first pores 21a in the plurality of first pores 21a overlap at least partially with the projections of at least some of the second pores 22a in 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 shell 11, an electrode terminal 12 provided on the shell 11, and an electrode assembly 13 located in the shell 11 and electrically connected to the electrode terminal 12. The electrode terminal 12 is connected to the main body 223, and there is a first adhesive 3 between the electrode terminal 12 and the main body 223.

[0141] The first adhesive 3 bonds the electrode terminal and the main body 223 .

[0142] Optionally, the first adhesive 3 is structural adhesive.

[0143] In the embodiment of the present disclosure, since the projection along the first direction X, the projection of at least part of the multiple first pores 21a overlaps with the projection of at least part of the second pores 22a in the multiple second pores 22a, and there is a first adhesive 3 between the electrode terminal and the main body 223, therefore, in the process of using the first adhesive 3 to bond the pressure plate assembly 2 and the electrode terminal, the first adhesive 3 can overflow into the pores facing the electrode terminal. Thus, the overflow of the first adhesive 3 into the pores facing the electrode terminal can be observed through another pore, which is beneficial to improving the bonding strength between the pressure plate assembly 2 and the battery cell assembly 10.

[0144] In some embodiments, as Figure 4 As shown, the battery cell assembly 10 further includes a busbar 101 . Along the first direction X, the busbar 101 is connected between the electrode terminal 12 and the main body 223 , and a first adhesive 3 is present between the busbar 101 and the main body 223 .

[0145] The first adhesive 3 bonds the bus bar 101 and the main body 223 together.

[0146] In the embodiment of the present disclosure, since there is a first adhesive 3 between the busbar 101 and the main body 223, in the process of using the first adhesive 3 to bond the pressure plate assembly 2 and the busbar 101, the first adhesive 3 can overflow into the pores toward the busbar 101. Thus, the situation of the first adhesive 3 overflowing into the pores toward the busbar 101 can be observed through another pore, which is beneficial to improving the bonding strength between the pressure plate assembly 2 and the busbar 101.

[0147] In some embodiments, the busbars 101 in the same battery cell assembly 10 are connected to the same main body 223 .

[0148] Optionally, some or all of the current busbars 101 in the same battery cell assembly 10 may be connected to the same main body 223 .

[0149] In the embodiment of the present disclosure, since the busbars 101 in the same battery cell assembly 10 are connected to the same main body 223, the busbars 101 in the same battery cell assembly 10 form a whole, and the battery cells 1 connected to the busbars 101 can also form a whole. In the case of thermal expansion of the battery cells 1 in the battery cell assembly 10, the pressure plate assembly 2 can apply anti-expansion force to the battery cells 1 in the battery cell assembly 10, reducing the probability of expansion of the battery cells 1, and the force applied to the battery cells 1 can be transmitted to other battery cells 1 through the pressure plate assembly 2, so that the force applied to the battery cell assembly 10 is more uniform, reducing the probability of stress concentration in the battery cell assembly 10.

[0150] In some embodiments, 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, and along the second direction Y, the protrusion 222 is located between the busbars 101 in two adjacent battery cell assemblies 10, and 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.

[0151] In some embodiments, at least two battery cell assemblies 10 include a first battery cell assembly and a second battery cell assembly adjacent to each other along the second direction Y. The same protrusion 222 abuts both the first and second battery cell assemblies. Furthermore, the same protrusion 222 abuts both the shoulder of the first battery cell assembly proximate to the second battery cell assembly and the shoulder of the second battery cell assembly proximate to the first battery cell assembly. 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.

[0152] In the embodiment of the present disclosure, because the protrusion abuts the outer shells of the battery cells 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, facilitating easier assembly of the battery device 100. Furthermore, because the protrusion abuts the outer shells of the battery cells 1 in two adjacent battery cell assemblies 10 along the second direction Y, the step of using components such as beading to fix the relative position of multiple battery cell assemblies 10 can be eliminated. This not only reduces the number of components but also reduces the number of assembly steps for the battery device 100, thereby facilitating faster production efficiency of the battery device 100.

[0153] In some embodiments, as Figure 4 and Figure 10 As shown, the battery cell assembly 10 includes a battery cell 1, the battery cell 1 includes a shell 11, an electrode terminal 12 provided on the shell 11, and an electrode assembly 13 located in the shell 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.

[0154] In some embodiments, the battery device 100 is inverted, and the pressure plate assembly 2 is located below the busbar 101 .

[0155] In the embodiment of the present 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 stones splashed from the ground or protrusions on the ground hit the battery device 100, the pressure plate assembly 2 can deform to absorb the impact force to reduce the impact force transmitted to the battery cell assembly 10, and reduce the probability of deformation of the battery cell assembly 10 in the box 20 or misalignment of components in the battery cell assembly.

[0156] In some embodiments, the box body 20 includes a first box body (not shown), the electrode terminal faces the first box body along the first direction X, and along the first direction X, the second pressure plate 22 is located between the first pressure plate 21 and the battery cell assembly, and the first box body and the first pressure plate 21 are connected by a second adhesive (not shown).

[0157] The second adhesive bonds the first box body and the first pressing plate 21 .

[0158] Optionally, the second adhesive may be a structural adhesive.

[0159] In the embodiment of the present disclosure, since the second adhesive is provided between the first housing and the first pressing plate 21 , the first housing, the first pressing 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 .

[0160] A second aspect of the present application provides an electrical device, which includes at least one battery device 100 as described above. The battery device 100 is used to store or provide electrical energy.

[0161] In the embodiment of the present disclosure, since the electrical device includes at least one battery device 100 described above, the probability of deformation of the battery cell assembly 10 in the box 20 of the electrical device or misalignment of components in the battery cell assembly can be reduced.

[0162] The third aspect of the present application provides a method for manufacturing a battery device 100, wherein the battery device 100 includes a pressure plate assembly 2, a battery cell assembly 10, a busbar 101, and a box body 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 is formed with a plurality of first pores 21a, and the second pressure plate 22 is formed with a plurality of second pores 22a. The second pressure plate 22 includes a main body 223 and a protrusion 222 alternately connected in sequence along a second direction Y. The main body 223 is connected to the first pressure plate 21 and is connected along the first direction X. In the direction X, 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 with the first direction X. The pressure plate assembly 2 and the battery cell assembly 10 are located in the box 20. The battery cell 1 includes a shell, an electrode terminal provided in the shell and an electrode assembly 13 located in the shell and electrically connected to the electrode terminal. The busbar 101 is electrically connected to the electrode terminal. The manufacturing method includes: using a first adhesive 3 to bond the pressure plate assembly 2 to the battery cell assembly 10, and the first adhesive 3 is located outside the area between the busbars 101 of two adjacent battery cell assemblies 10.

[0163] In some embodiments, structural adhesive is applied to the side of the second box body 20b facing the battery cell assembly 10, structural adhesive is applied to the side of the battery cell assembly 10 facing the second box body 20b, the battery cell assembly 10 is bonded to the second box body 20b, structural adhesive is applied to the side of the busbar 101 connected to the battery cell assembly 10 facing away from the battery cell assembly 10, the pressure plate assembly 2 is bonded, and structural adhesive is applied to the side of the pressure plate assembly 2 facing away from the busbar 101 to bond the first box body, thereby forming a whole.

[0164] In the embodiment of the present disclosure, because the first pressing plate 21 is formed with a plurality of first apertures 21a, and the second pressing plate 22 is formed with a plurality of second apertures 22a, the pressing plate assembly 2 is bonded to the battery cell assembly 10 using the first adhesive 3. Therefore, the pressing plate assembly 2 can deform to absorb impact forces, thereby reducing the impact forces transmitted to the battery cell assembly 10 and lowering the probability of deformation of the battery cell assembly 10 within the housing 20 or misalignment of components within the battery cell assembly. Furthermore, because the first adhesive 3 is located outside the region between the current collectors 101 of two adjacent battery cell assemblies 10, no adhesive need be applied to the region between the current collectors 101 of two adjacent battery cell assemblies 10. This reduces the number of manufacturing steps for the battery device 100 and facilitates faster production of the battery device 100.

[0165] In a specific embodiment, the pressure plate assembly 2 uses a honeycomb panel with a central honeycomb structure, which not only reduces the weight of the pressure plate assembly 2 but also increases its strength. Actual data shows that an all-aluminum honeycomb panel weighs only 30% to 40% of traditional panels, but can withstand pressures 2 to 3 times higher.

[0166] In a specific embodiment, an array of holes are opened on the pressure plate assembly 2, and the impact force in the direction of gravity is absorbed by the honeycomb structure in the middle. At the same time, the production process is simplified. The shoulders of the battery cell assembly 10 do not need to be coated with structural adhesive or installed with pressure strips. After the structural adhesive is applied on 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.

[0167] In one specific embodiment, the pressure plate assembly 2 is entirely made of lightweight aluminum alloy and is constructed from a double layer of aluminum alloy plates. The first layer (second pressure plate 22) is provided with an array of second pores 22a with a diameter of approximately 30 mm, while the second layer (first pressure plate 21) is provided with first pores 21a with a diameter of approximately 35 mm. The small, densely packed second pores 22a primarily serve to increase the bonding area between the manifold 101 and the pressure plate assembly 2 when the manifold 101 is bonded together. The large, sparsely packed first pores 21a primarily serve to absorb impact forces.

[0168] 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 , thereby eliminating a structural adhesive application process and reducing manufacturing costs.

[0169] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery device, characterized in that: include: Box; A battery monomer assembly is located in the box; A pressure plate assembly is located in the box, 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 on one side along the first direction, the first direction is the thickness direction of the first pressure plate, the first pressure plate is formed with a plurality of first pores, and the second pressure plate is formed with a plurality of second pores. The second pressure plate includes a main body and a protrusion connected alternately 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 form a cavity. The second direction intersects with the first direction.

2. The battery device according to claim 1, wherein: Along the first direction, a first adhesive is provided between the pressure plate assembly and the battery cell assembly; Projected along the first direction, projections of at least some of the first pores in the plurality of first pores at least partially overlap with projections of at least some of the second pores in the plurality of second pores.

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

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

5. The battery device according to claim 3, wherein: The diameter of the second pores is in the range of 30 mm to 40 mm.

6. The battery device according to claim 2, wherein: Projected along the first direction, a ratio of a total area of ​​projected first pores to a total area of ​​projected second pores is in a range of 45% to 65%.

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

8. The battery device according to any one of claims 1 to 7, characterized in that The first pores are provided at a connection portion between the first pressing plate and the main body, and the second pores are provided in the main body. Projected along the first direction, projections of at least some of the plurality of first pores at least partially overlap with projections of at least some of the plurality of second pores at least partially. The battery cell assembly includes a battery cell, which includes a shell, an electrode terminal provided on the shell, and an electrode assembly located in the shell and electrically connected to the electrode terminal. The electrode terminal is connected to the main body, and a first adhesive is present between the electrode terminal and the main body.

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

10. The battery device according to claim 9, characterized in that The current collectors in the same battery cell assembly are connected to the same main body.

11. The battery device according to claim 9, characterized in that Along the first direction, the second pressing plate is located between the first pressing plate and the battery cell assembly, and along the second direction, the protrusion is located between the current collectors in two adjacent battery cell assemblies. The protrusion abuts against the outer casings of the battery cells in two battery cell assemblies adjacent to each other in the second direction.

12. The battery device according to any one of claims 1 to 7, characterized in that The battery cell assembly includes a battery cell, which includes a shell, an electrode terminal provided on the shell, and an electrode assembly located in the shell and electrically connected to the electrode terminal. Along the direction of gravity, the electrode terminal is located below the electrode assembly, and the pressure plate assembly is located below the electrode terminal.

13. The battery device according to claim 12, characterized in that The box includes a first box, the electrode terminal faces the first box along the first direction, the second pressing plate is located between the first pressing plate and the battery cell assembly along the first direction, and the first box and the first pressing plate are connected by a second adhesive.

14. An electrical device, characterized in that: The invention comprises at least one battery device according to any one of claims 1 to 13, wherein the battery device is used to store or provide electrical energy.

15. 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 box body, the pressure plate assembly including a first pressure plate and a second pressure plate connected to the first pressure plate on one side along a first direction, the first direction being the thickness direction of the first pressure plate, the first pressure plate forming a plurality of first apertures, the second pressure plate forming a plurality of second apertures, the second pressure plate including a main body portion and a protrusion portion alternately connected in sequence along a second direction, the main body portion being connected to the first pressure plate, the protrusion portion protruding away from the first pressure plate relative to the main body portion along the first direction, the protrusion portion and the first pressure plate forming a cavity, the second direction intersecting the first direction, the pressure plate assembly and the battery cell assembly being located in the box body, the battery cell including a shell, an electrode terminal provided in the shell body and an electrode assembly located in the shell body and electrically connected to the electrode terminal, the busbar being electrically connected to the electrode terminal, and the manufacturing method including: 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 a region between current collectors of two adjacent battery cell assemblies.

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