Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device.An electrode assembly of the battery monomer comprises a plurality of pole piece units which are arranged in a stacked mode in the first direction, each pole piece unit comprises a first pole piece and a second pole piece which are arranged in a stacked mode in the first direction, and the polarity of the first pole piece is opposite to that of the second pole piece; the two sides of any one of the first pole piece and the second pole piece along the first direction are connected with solid electrolyte layers; the pole piece unit further comprises a bonding frame arranged on the outer edge of the second pole piece in a sleeving mode, the inner edge shape of the bonding frame is matched with the outer edge shape of the second pole piece, and the outer edge shape of the bonding frame is matched with the inner edge shape of the first pole piece; along the first direction, the two sides of the bonding frame are respectively bonded with the adjacent first pole pieces along the first direction. According to the invention, the processing procedure and the equipment requirement of the electrode plate can be simplified, the production efficiency of the electrode assembly is improved, the production cost can be reduced, and the production efficiency of the battery monomer is further improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery cells, battery devices, and power-consuming devices. Background Art

[0002] New energy batteries are being used more and more widely in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly applied in the energy storage field and so on.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. With the continuous increase in the demand for batteries, the industry's requirements for the production efficiency of battery cells are also constantly improving. Therefore, how to improve the production efficiency of battery cells has become one of the important research topics in the industry. Summary of the Utility Model

[0004] To solve the above technical problems, this application provides a battery cell, a battery device, and a power-consuming device.

[0005] This application is implemented through the following technical solutions.

[0006] In a first aspect of an embodiment of this application, a battery cell is provided, including an electrode assembly. The electrode assembly includes a plurality of electrode sheet units stacked along a first direction. The electrode sheet unit includes a first electrode sheet and a second electrode sheet stacked along the first direction. The first electrode sheet and the second electrode sheet have opposite polarities. Solid electrolyte layers are connected to both sides of either the first electrode sheet or the second electrode sheet along the first direction. The first direction is the thickness direction of the first electrode sheet and the second electrode sheet. The electrode sheet unit further includes an adhesive frame sleeved on the outer edge of the second electrode sheet. The inner edge shape of the adhesive frame matches the outer edge shape of the second electrode sheet, and the outer edge shape of the adhesive frame matches the inner edge shape of the first electrode sheet. Along the first direction, both sides of the adhesive frame are adhesively connected to the first electrode sheets adjacent along the first direction.

[0007] Since the outer edge of the second electrode sheet is sleeved with an adhesive frame, and both sides of the adhesive frame are adhesively connected to the first electrode sheets adjacent along the first direction, through the dimensional cooperation of the first electrode sheet, the second electrode sheet, and the adhesive frame, the adhesive frame can not only adhesively connect the first electrode sheet and the second electrode sheet within the electrode sheet unit, but also effectively adhesively connect adjacent electrode sheet units, making the connection between multiple electrode sheet units more stable. In addition, due to the simple structure of the electrode sheet unit, during the processing of the electrode sheets, the first electrode sheet sleeved with the adhesive frame can be laminated with the second electrode sheet, which can not only simplify the processing procedures and equipment requirements of the electrode assembly, but also reduce the processing cost and further improve the production efficiency of the electrode assembly and the battery cell.

[0008] In some embodiments, the bonding frame includes a first bonding layer, a base material layer, and a second bonding layer that are sequentially stacked along the first direction. The first bonding layer is configured to bond the second electrode of the electrode unit to the first electrode of the adjacent electrode unit. The base material layer is used to carry the first bonding layer and the second bonding layer. The second bonding layer is configured to bond the second electrode of each electrode unit to the first electrode.

[0009] Thus, the first bonding layer and the second bonding layer can bond the first electrodes respectively, and the base material layer between the first bonding layer and the second bonding layer can carry and support the two bonding layers. During unwind processing, they can be supplied as a whole, further simplifying the processing procedures and equipment requirements and reducing the processing cost.

[0010] In some embodiments, the thickness difference between the second electrode and the bonding frame along the first direction does not exceed 10 μm.

[0011] Since the thickness difference between the second electrode and the bonding frame does not exceed 10 μm, the risk of the bonding layer deforming and covering the second electrode during processing due to pressure can be reduced, the influence of the bonding frame on the electrochemical performance of the electrode can be reduced, and the consistency and quality stability of the electrode unit can be improved.

[0012] In some embodiments, the first bonding layer is a thermosensitive hot melt adhesive layer, and the second bonding layer is a pressure-sensitive hot melt adhesive layer.

[0013] Since the first bonding layer is a thermosensitive hot melt adhesive layer and the second bonding layer is a pressure-sensitive hot melt adhesive layer, during the processing, the first bonding layer and the second bonding layer can bond the corresponding components in different processes. By controlling the process, the high-strength bonding force of the thermosensitive hot melt adhesive layer and the fast bonding speed of the pressure-sensitive hot melt adhesive layer can be fully utilized.

[0014] In some embodiments, along the second direction, a first tab is connected to one side of the first electrode, and a second tab is connected to one side of the second electrode; the first tab and the second tab are located on the same side or opposite sides in the second direction, and the second direction is perpendicular to the first direction.

[0015] Thus, the first tab is connected to the first electrode, and the second tab is connected to the second electrode, which is beneficial for the electrode unit to transmit electric energy. The positions of the tabs can also be designed according to factors such as the structural shape of the battery cell, improving the configuration flexibility of the first tab and the second tab.

[0016] In some embodiments, the second tab is bent away from the side where the base material layer is located along the first direction.

[0017] Therefore, when the second tab is bonded to the second pole piece by the bonding frame, it can pass through the bonding layer, improving the bonding strength and further enhancing the alignment of the bonding frame and the second pole piece in the first direction, which is convenient for subsequent processing.

[0018] In some embodiments, the first pole piece is a negative pole piece, the second pole piece is a positive pole piece, and the solid electrolyte layer is connected to both sides of the first pole piece along the first direction.

[0019] Therefore, a solid electrolyte layer is provided between the positive and negative pole pieces of the pole piece unit, enabling ion exchange between the positive and negative pole pieces.

[0020] In some embodiments, the width of the bonding frame along the second direction is 0.5 mm - 5 mm.

[0021] Since the width of the bonding frame is within a suitable range, it can adapt to various pole piece products, improving the equipment utilization rate.

[0022] In some embodiments, the thickness of the bonding frame along the first direction is 50 μm - 300 μm, and the thickness of the bonding frame is the same as that of the second pole piece.

[0023] Since the thickness of the bonding frame is within a suitable range, it can adapt to various pole piece products, improving the equipment utilization rate. Additionally, the same thickness of the bonding frame and the second pole piece can further enhance the consistency and quality stability of the pole piece unit.

[0024] The second aspect of the embodiments of the present application provides a battery device, including a plurality of battery monomers according to the first aspect of the embodiments of the present application.

[0025] Since the battery device includes the battery monomer of the first aspect of the embodiments of the present application, the processing procedures and equipment requirements of the battery device can be simplified, improving the production efficiency of the battery device.

[0026] The third aspect of the embodiments of the present application provides an electrical device, including the battery monomer according to the first aspect of the embodiments of the present application or the battery device according to the second aspect of the embodiments of the present application, and the battery monomer or the battery device is used to store or provide electrical energy.

[0027] Since the electrical device includes the battery monomer of the first aspect of the embodiments of the present application or the battery device of the second aspect of the embodiments of the present application, the processing procedures and equipment requirements of the electrical device can be simplified, improving the production efficiency of the electrical device.

[0028] Through the present application, the processing procedures and equipment requirements of the pole piece can be simplified, not only improving the production efficiency of the electrode assembly, but also reducing the production cost and further enhancing the production efficiency of the battery monomer. Description of the Drawings

[0029] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0030] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0031] Figure 2 Schematic three-dimensional exploded view of a battery provided by some embodiments of the present application;

[0032] Figure 3 Schematic three-dimensional exploded view of a battery cell provided by some embodiments of the present application;

[0033] Figure 4 Schematic structural diagram of a stack of multiple pole piece units provided by some embodiments of the present application;

[0034] Figure 5 Schematic structural diagram of a pole piece unit provided by some embodiments of the present application;

[0035] Figure 6 Schematic structural diagram of a first pole piece and a second pole piece provided by some embodiments of the present application;

[0036] Figure 7 Schematic structural diagram of a pole piece processing device provided by some embodiments of the present application;

[0037] Figure 8 Schematic structural diagram of a release film roll provided by some embodiments of the present application.

[0038] Description of reference numerals

[0039] 10. Battery cell; 11. Outer shell; 12. Electrode assembly; 13. End cover; 14. Housing; 15. Electrode terminal; 20. Pole piece unit; 21. First pole piece; 21A. First tab; 22. Second pole piece; 22A. Second tab; 23. Solid electrolyte layer; 30. Adhesive frame; 31. First adhesive layer; 32. Substrate layer; 33. Second adhesive layer; 34. Release film; 35. Connection part; 100. Battery device; 101. Box body; 102. Cover body; 103. Bottom plate; 200. Controller; 300. Motor; 1000. Vehicle; 2000. Pole piece processing device; 2001. Release film unwinding mechanism; 2002. Release film winding mechanism; 2003. First pole piece unwinding mechanism; 2004. Second pole piece stacking mechanism; 2005. Release roller; 2006. Cutting mechanism. Detailed embodiments

[0040] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field 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 this specification and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0043] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this specification generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installation", "connection", "attachment", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may also be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship 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.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the technical term "contact" shall be understood in a broad sense. It may be direct contact or contact through an intermediate medium layer. It may be contact with substantially no mutual force between the two in contact, or contact with mutual force between the two in contact.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the technical terms "parallel" and "perpendicular" both allow a certain degree of tolerance and / or error, including the cases of approximately parallel and approximately perpendicular.

[0049] The following is a detailed description of the present application.

[0050] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand for them is also constantly increasing.

[0051] In a new energy vehicle equipped with a battery, the battery can be used to provide power wholly or partially. With the continuous increase in the demand for batteries, the industry's requirements for the production efficiency of battery cells are also constantly improving. Therefore, how to improve the production efficiency of battery cells has become one of the important research topics in the industry.

[0052] After research and design, the production process of the electrode assembly of a battery cell includes multiple steps. Among them, the pole piece lamination step has problems such as complex processes and long time consumption. When bonding the positive pole piece and the negative pole piece, it is usually necessary to first apply glue on the pole piece and then wait for the glue to cure before lamination, which greatly affects the lamination efficiency. However, using a bonding frame to bond the pole pieces can simplify the processing process of the electrode assembly and improve the production efficiency of the electrode assembly and the battery cell.

[0053] Based on such a design concept, the present application designs a battery cell, including an electrode assembly. The electrode assembly includes a plurality of electrode sheet units stacked along a first direction. The electrode sheet unit includes a first electrode sheet and a second electrode sheet stacked along the first direction. The first electrode sheet and the second electrode sheet have opposite polarities. On both sides of either the first electrode sheet or the second electrode sheet along the first direction, a solid electrolyte layer is connected. The first direction is the thickness direction of the first electrode sheet and the second electrode sheet. The electrode sheet unit further includes an adhesive frame sleeved on the outer edge of the second electrode sheet. The inner edge shape of the adhesive frame coincides with the outer edge shape of the second electrode sheet, and the outer edge shape of the adhesive frame coincides with the inner edge shape of the first electrode sheet. Along the first direction, both sides of the adhesive frame are adhesively connected to the first electrode sheets adjacent along the first direction.

[0054] Since the outer edge of the second electrode sheet is sleeved with an adhesive frame, and both sides of the adhesive frame are adhesively connected to the adjacent first electrode sheets along the first direction, through the dimensional cooperation of the first electrode sheet, the second electrode sheet and the adhesive frame, the adhesive frame can not only adhesively connect the first electrode sheet and the second electrode sheet in the electrode sheet unit, but also effectively adhesively connect adjacent electrode sheet units, making the connection between multiple electrode sheet units more stable. In addition, due to the simple structure of the electrode sheet unit, during the processing of the electrode sheet, the first electrode sheet sleeved with the adhesive frame can be laminated with the second electrode sheet, which can not only simplify the processing process and equipment requirements of the electrode assembly, but also reduce the processing cost and further improve the production efficiency of the electrode assembly and the battery cell.

[0055] In the following embodiments, for the convenience of description, a power-consuming device of an embodiment of the present application is taken as an example of a vehicle 1000 for description. The following is described with reference to the drawings.

[0056] Figure 1 The structural schematic diagram of the vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for the power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0057] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0058] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0059] The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0060] Although not shown, the battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through.

[0061] In some embodiments, the electrode assembly is provided with tabs (not shown), and the tabs can lead the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0062] In some embodiments, the electrode assembly may have a wound structure, a laminated structure, or a hybrid structure of winding and lamination.

[0063] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0064] As an example, the battery cell may 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, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc., and the present application has no special limitation.

[0065] In some embodiments, as Figure 3 shown, the housing includes a shell and an end cap. The shell is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating components such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0066] In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and a sealed bag is further included between the housing and the electrode assembly. The sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0067] In some embodiments, such as Figure 3 shown, at least one electrode terminal 15 is provided on the outer casing 11, and the electrode terminal 15 is electrically connected to the tab. The electrode terminal 15 can be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal 15 can be provided on the end cap 13 or on the housing 14.

[0068] The emissions from the battery cell mentioned in this application include, but are not limited to: electrolyte, dissolved or fragmented positive and negative electrode plates, debris of the separator, high-temperature and high-pressure gases generated by the reaction, flame, and so on.

[0069] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a bus bar component.

[0070] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0071] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0072] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0073] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0074] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0075] As an example, the box body can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0076] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0077] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage electric cabinet, etc.

[0078] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0079] Below, with reference to Figures 3 to 8 Some embodiments of the present application will be described in detail.

[0080] Figure 3 A three-dimensional exploded view of a battery cell provided for some embodiments of the present application; Figure 4 A schematic structural diagram of a stack of multiple pole piece units provided for some embodiments of the present application; Figure 5 A schematic structural diagram of a pole piece unit provided for some embodiments of the present application; Figure 6 A schematic structural diagram of a first pole piece and a second pole piece provided for some embodiments of the present application; Figure 7 A schematic structural diagram of a pole piece processing device provided for some embodiments of the present application; Figure 8 A schematic structural diagram of a release film coil provided for some embodiments of the present application.

[0081] In some embodiments of the present application, for the convenience of description, a first direction and a second direction are set. The directions where the first direction and the second direction are located are directions that cross each other. Here, crossing each other includes perpendicular crossing to each other. For the convenience of understanding the embodiments of the present application, in the embodiments shown in FIGS. 4 to 5, an example where the first direction and the second direction are perpendicular to each other is used for illustration. However, those skilled in the art should understand that the embodiments of the present application are not limited to the case where the two directions are perpendicular to each other. For the convenience of description, as shown by the arrows in FIGS. 4 to 5, the direction where the arrow Z is located is the first direction, and the direction where the arrow X is located is the second direction. Sometimes the direction in which the arrow Z points along the first direction is also called "upward", and its opposite direction is called "downward".

[0082] The first aspect of the embodiments of the present application provides a battery cell 10. In the embodiments of the present application, as Figure 2 、 Figure 3As shown in the figure, the battery cell 10 includes an electrode assembly 12. The electrode assembly 12 includes a plurality of electrode sheet units 20 stacked along a first direction (Z). The electrode sheet unit 20 includes a first electrode sheet 21 and a second electrode sheet 22 stacked along the first direction (Z). The first electrode sheet 21 and the second electrode sheet 22 have opposite polarities. On both sides of either the first electrode sheet 21 or the second electrode sheet 22 along the first direction (Z), a solid electrolyte layer 23 is connected. The first direction (Z) is the thickness direction of the first electrode sheet 21 and the second electrode sheet 22. The electrode sheet unit 20 further includes an adhesive frame 30 sleeved on the outer edge of the second electrode sheet 22. The inner edge shape of the adhesive frame 30 coincides with the outer edge shape of the second electrode sheet 22, and the outer edge shape of the adhesive frame 30 coincides with the inner edge shape of the first electrode sheet 21. Along the first direction (Z), both sides of the adhesive frame 30 are adhesively connected to the adjacent first electrode sheets 21 along the first direction (Z).

[0083] In the embodiment of the present application, the electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs.

[0084] In a specific embodiment, as Figure 3 shown, the battery cell 10 may include an electrode assembly 12 and a housing 11. The housing 11 includes a housing body 14 and an end cap 13. The housing body 14 is provided with an opening, and the end cap 13 closes the opening to form a sealed space for accommodating the electrode assembly 12.

[0085] Optionally, the housing body 14 may be provided with one or more openings. One or more end caps 13 may also be provided.

[0086] Exemplarily, the end cap 13 may be provided with an electrode terminal 15. The electrode terminal 15 may be used for electrically connecting to the electrode assembly 12 to facilitate outputting the electric energy of the battery cell 10 or inputting electric energy into the battery cell 10.

[0087] In a specific embodiment, the electrode assembly 12 is a laminated structure formed by a plurality of electrode sheets.

[0088] In a specific embodiment, the electrode assembly 12 includes a plurality of electrode sheet units 20. The electrode sheet unit 20 includes a first electrode sheet 21, a second electrode sheet 22, and a solid electrolyte layer 23. The solid electrolyte layer 23 is disposed between the first electrode sheet 21 and the second electrode sheet 22.

[0089] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0090] Optionally, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid, cellulose, etc.

[0091] Optionally, the inorganic solid electrolyte may be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0092] Optionally, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0093] Exemplarily, the first pole piece 21 and the second pole piece 22 have opposite polarities. The first pole piece 21 may be a positive pole piece, and the second pole piece 22 may be a negative pole piece.

[0094] Another exemplarily, the first pole piece 21 and the second pole piece 22 have opposite polarities. The second pole piece 22 may be a positive pole piece, and the first pole piece 21 may be a negative pole piece.

[0095] In the embodiment of the present application, the bonding frame 30 is sleeved on the outer edge of the second pole piece 22. The inner edge shape of the bonding frame 30 coincides with the outer edge shape of the second pole piece 22, and the outer edge shape of the bonding frame 30 coincides with the inner edge shape of the first pole piece 21;

[0096] It can be understood that when projected onto a projection plane perpendicular to the first direction (Z) along the first direction (Z), the projection of the second pole piece 22 completely falls within the range of the first pole piece 21.

[0097] Optionally, when projected onto a projection plane perpendicular to the first direction (Z) along the first direction (Z), the shape of the bonding frame 30 may be a circular ring, an elliptical ring, a square ring, or other shapes. The present application does not limit this, and the bonding frame 30 can be designed according to the shape of the pole piece.

[0098] In the embodiment of the present application, along the first direction (Z), both sides of the bonding frame 30 are bonded to the first pole pieces 21 adjacent along the first direction (Z).

[0099] It can be understood that along the first direction (Z), the bonding frame 30 has a bonding surface and can bond the adjacent first pole pieces 21 on both sides.

[0100] It can also be understood that the bonding frame 30 has a certain thickness. It is sleeved on the outer edge of the second pole piece 22 and can also bond and fix the position of the second pole piece 22 at the same time.

[0101] Optionally, the thickness of the bonding frame 30 and the thickness of the second pole piece 22 may be the same or different.

[0102] In a specific embodiment, the bonding frame 30 can be prefabricated and then sleeved on the outer edge of the second pole piece 22. This can improve the processing efficiency of the pole piece unit 20.

[0103] Since the outer edge of the second pole piece 22 is sleeved with an adhesive frame 30, and the two sides of the adhesive frame 30 are respectively adhered to the first pole pieces 21 adjacent in the first direction (Z), through the dimensional cooperation of the first pole piece 21, the second pole piece 22 and the adhesive frame 30, the adhesive frame 30 can not only adhere the first pole piece 21 and the second pole piece 22 in the pole piece unit 20, but also effectively adhere the adjacent pole piece units 20, making the connection between multiple pole piece units 20 more stable. In addition, since the structure of the pole piece unit 20 is simple, during the processing of the pole pieces, the first pole piece 21 sleeved with the adhesive frame 30 can be laminated with the second pole piece 22, which can not only simplify the processing procedures and equipment requirements of the electrode assembly 12, but also reduce the processing cost and further improve the production efficiency of the electrode assembly 12 and the battery cell 10.

[0104] In the embodiment of the present application, the adhesive frame 30 includes a first adhesive layer 31, a base material layer 32 and a second adhesive layer 33 which are sequentially laminated in the first direction (Z). The first adhesive layer 31 is configured to adhere the second pole piece 22 of the pole piece unit 20 and the first pole piece 21 of the adjacent pole piece unit 20. The base material layer 32 is used to carry the first adhesive layer 31 and the second adhesive layer 33. The second adhesive layer 33 is configured to adhere the second pole piece 22 and the first pole piece 21 of each pole piece unit 20.

[0105] In a specific embodiment, as Figure 5 shown, there are adhesive layers on both sides of the base material layer 32, which respectively adhere the first pole piece 21 in the pole piece unit 20 and the first pole piece 21 of the adjacent pole piece unit 20.

[0106] Optionally, the thickness of the first adhesive layer 31 and the thickness of the second adhesive layer 33 may be the same or different.

[0107] Optionally, along the second direction (X), the width of the first adhesive layer 31 and the width of the second adhesive layer 33 may be the same or different.

[0108] Optionally, along the second direction (X), the width of the base material layer 32 and the widths of the first adhesive layer 31 and the second adhesive layer 33 may be the same or different.

[0109] Optionally, the material of the base material layer 32 may be any one of high molecular materials such as polyethylene terephthalate, polypropylene, polyethylene, polyimide, polyvinyl chloride, etc., so that the base material layer 32 has a certain strength to play a role in carrying or supporting the first adhesive layer 31 and the second adhesive layer 33.

[0110] Optionally, the first adhesive layer 31 may be an adhesive layer, and the material of the second adhesive layer 33 may be the same as or different from that of the first adhesive layer 31.

[0111] Thus, the first adhesive layer 31 and the second adhesive layer 33 can respectively bond the first pole piece 21, and the substrate layer 32 between the first adhesive layer 31 and the second adhesive layer 33 can carry and support the two adhesive layers. During unwind processing, they can be supplied in one piece, further simplifying the processing procedures and equipment requirements and reducing the processing costs.

[0112] In the embodiment of the present application, the thickness difference between the second pole piece 22 and the bonding frame 30 along the first direction (Z) does not exceed 10 μm.

[0113] Optionally, the thickness difference between the second pole piece 22 and the bonding frame 30 can be 0 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc. Other values are not listed here.

[0114] Since the thickness difference between the second pole piece 22 and the bonding frame 30 does not exceed 10 μm, the risk of the adhesive layer deforming to cover the second pole piece 22 due to pressure on the pole piece unit 20 during subsequent isostatic pressing process steps can be reduced, the influence of the bonding frame 30 on the electrochemical performance of the pole piece can be reduced, and the consistency and quality stability of the pole piece unit 20 can be improved.

[0115] In the embodiment of the present application, the first adhesive layer 31 is a thermosensitive hot melt adhesive layer, and the second adhesive layer 33 is a pressure-sensitive hot melt adhesive layer.

[0116] Thermosensitive hot melt adhesives are a type of polymer material that becomes liquid when heated and quickly solidifies to form a bond when cooled. Optionally, the first adhesive layer 31 can be an adhesive layer formed by EVA (ethylene-vinyl acetate copolymer)-based hot melt adhesive, PA (polyamide)-based hot melt adhesive, MS (modified silane)-based hot melt adhesive, acrylate-based hot melt adhesive, polyolefin-based hot melt adhesive, etc. Other types are not listed in the embodiments of the present application.

[0117] Pressure-sensitive hot melt adhesives are an adhesive that combines the characteristics of hot melt adhesives and pressure-sensitive adhesives. It can provide instant adhesion force under slight pressure, making it more convenient to bond the pole pieces. Optionally, the second adhesive layer 33 can be an adhesive layer formed by silicone pressure-sensitive adhesive, polyurethane pressure-sensitive adhesive, styrene block copolymer pressure-sensitive adhesive, etc. Other types are not listed in the embodiments of the present application.

[0118] Since the first adhesive layer 31 is a thermosensitive hot melt adhesive layer and the second adhesive layer 33 is a pressure-sensitive hot melt adhesive layer, during the processing, the first adhesive layer 31 and the second adhesive layer 33 can bond the corresponding components in different processes, and by controlling the process, the high-strength adhesion force of the thermosensitive hot melt adhesive layer and the fast bonding speed of the pressure-sensitive hot melt adhesive layer can be fully utilized.

[0119] In an embodiment of the present application, along the second direction (X), a first tab 21A is connected to one side of the first electrode tab 21, and a second tab 22A is connected to one side of the second electrode tab 22; the first tab 21A and the second tab 22A are located on the same side or opposite sides of the second direction (X), and the second direction (X) is perpendicular to the first direction (Z).

[0120] Exemplarily, as Figure 5 、 Figure 6 shown, along the second direction (X), a first tab 21A is connected to one side of the first electrode tab 21, and a second tab 22A is connected to one side of the second electrode tab 22; the first tab 21A and the second tab 22A are located on the same side of the second direction (X).

[0121] It can be understood that the tab can conduct the current out of the electrode assembly 12. The electrode terminal 15 is electrically connected to the tab, which can be that the electrode terminal 15 is directly connected to the tab, or that the electrode terminal 15 is connected to the tab through an adapter.

[0122] Optionally, along the second direction (X), the length of the first tab 21A can be the same as or different from that of the second tab 22A.

[0123] Thus, the first tab 21A is connected to the first electrode tab 21, and the second tab 22A is connected to the second electrode tab 22, which is beneficial to the transmission of electric energy by the electrode tab unit 20. The tab positions can also be designed according to factors such as the structural shape of the battery cell 10, improving the configuration flexibility of the first tab 21A and the second tab 22A.

[0124] In an embodiment of the present application, the second tab 22A is bent away from the side where the substrate layer 32 is located along the first direction (Z).

[0125] Thus, the second tab 22A can pass through the adhesive layer when the adhesive frame 30 adheres to the second electrode tab 22, improving the adhesion strength and further improving the alignment degree of the adhesive frame 30 and the second electrode tab 22 in the first direction (Z), facilitating subsequent processing.

[0126] In an embodiment of the present application, the first electrode tab 21 is a negative electrode tab, the second electrode tab 22 is a positive electrode tab, and the solid electrolyte layer 23 is connected to both sides of the first electrode tab 21 along the first direction (Z).

[0127] In a specific embodiment, as Figure 5 、 Figure 6 shown, when projected onto a projection plane perpendicular to the first direction (Z) along the first direction (Z), the projection of the positive electrode tab completely falls within the range of the negative electrode tab.

[0128] In a specific embodiment, as Figure 4As shown, after multiple electrode sheet units 20 are stacked, a solid electrolyte layer 23 is provided between any positive electrode sheet and the adjacent negative electrode sheet.

[0129] Thus, a solid electrolyte layer 23 is provided between the positive electrode sheet and the negative electrode sheet of the electrode sheet unit 20, enabling ion exchange between the positive and negative electrode sheets.

[0130] In the embodiment of the present application, the width of the bonding frame 30 along the second direction (X) is 0.5 mm - 5 mm.

[0131] Optionally, the width of the bonding frame 30 can be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, etc. Other values are not listed in the embodiments of the present application.

[0132] Since the width of the bonding frame 30 is within a suitable range, it can adapt to various pole piece products of different sizes, improving the equipment utilization rate.

[0133] In the embodiment of the present application, the thickness of the bonding frame 30 along the first direction (Z) is 50 μm - 300 μm, and the thickness of the bonding frame 30 is the same as the thickness of the second electrode sheet 22.

[0134] Optionally, the thickness of the bonding frame 30 can be 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, etc. Other values are not listed in the embodiments of the present application.

[0135] Since the thickness of the bonding frame 30 is within a suitable range, it can adapt to various pole piece products of different sizes, improving the equipment utilization rate. Additionally, the thickness of the bonding frame 30 is the same as that of the second electrode sheet 22, which can further improve the consistency and quality stability of the electrode sheet unit 20.

[0136] The second aspect of the embodiment of the present application provides a battery device 100. In the embodiment of the present application, the battery device 100 includes a plurality of battery cells 10 of the first aspect of the embodiment of the present application.

[0137] Figure 2 This is a three-dimensional exploded view of the battery device 100 provided by the embodiment of the present application. As Figure 2 shown, the battery device 100 includes a box body 101 and at least one battery cell 10. The box body 101 includes a bottom plate 103 and a cover body 102. The cover body 102 covers the upper part of the bottom plate 103, thereby forming an accommodation space for the battery cell 10.

[0138] Since the battery device 100 includes the battery cell 10 of the first aspect of the embodiments of the present application, the processing procedures and equipment requirements of the battery device 100 can be simplified, and the production efficiency of the battery device 100 can be improved.

[0139] The third aspect of the embodiments of the present application provides an electrical device. In the embodiments of the present application, the electrical device includes the battery cell 10 of the first aspect of the embodiments of the present application or the battery device 100 of the second aspect of the embodiments of the present application. The battery cell 10 or the battery device 100 is used to store or provide electrical energy.

[0140] In a specific embodiment, the electrical device may be a vehicle 1000. As Figure 1 shown, a battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0141] Since the electrical device includes the battery cell 10 of the first aspect of the embodiments of the present application or the battery device 100 of the second aspect of the embodiments of the present application, the processing procedures and equipment requirements of the electrical device can be simplified, and the production efficiency of the electrical device can be improved.

[0142] The embodiments of the present application provide a preparation method for an adhesive frame 30, including the following steps:

[0143] Glue application step: Apply a pressure-sensitive hot melt adhesive and a heat-sensitive hot melt adhesive to both sides of the base material layer 32 respectively to form an adhesive layer composite.

[0144] Die-cutting step: Die-cut the adhesive layer composite, cut off the central part according to the outer contour shape of the second pole piece 22, and form the adhesive frame 30.

[0145] During the production process, the interconnected adhesive frames 30 can be used for continuous lamination. The embodiments of the present application further provide a preparation method for a continuous adhesive frame (interconnected adhesive frames 30), including the following steps:

[0146] Glue application step: Apply a pressure-sensitive hot melt adhesive and a heat-sensitive hot melt adhesive to both sides of the base material layer 32 respectively to form an adhesive layer composite.

[0147] Die-cutting step: Die-cut the adhesive layer composite, cut off the central part according to the outer contour shape of the second pole piece 22, and cut off the edge part according to the outer contour of the first pole piece 21, and leave a section of the adhesive layer composite between adjacent adhesive frames 30 to form a continuous adhesive frame.

[0148] The shape of the above-mentioned continuous bonding frame is as Figure 8 shown, Figure 8 The continuous bonding frame in includes two bonding frames 30 and a connecting portion 35 connecting the two bonding frames 30. Of course, it can be understood that the continuous bonding frame can include any number of bonding frames 30 and connecting portions 35 connecting adjacent bonding frames 30, and is not limited to the number and shape shown in the figure.

[0149] Optionally, the die-cut continuous bonding frame or the bonding frame 30 can be compounded with the release film 34, and deviation correction and winding are performed. The release film 34 can carry and support the continuous bonding frame or the bonding frame 30, so as to perform the next step of compounding the electrode sheet with the continuous bonding frame or the bonding frame 30.

[0150] In a specific embodiment, the release film 34 is in contact with the second bonding layer 33.

[0151] The embodiment of the present application provides a method for compounding a bonding frame 30 and an electrode sheet, including the following steps:

[0152] Unwinding: The release film 34 connected with the bonding frame 30 is unwound, and the tape carrying the first electrode sheet 21 is unwound, wherein the first bonding layer 31 of the bonding frame 30 faces the tape where the first electrode sheet 21 is located;

[0153] Rolling and compounding: The release film 34 is unwound and passes through the release roller 2005 together with the tape, and the first electrode sheet 21 and the bonding frame 30 are bonded to form an electrode sheet-bonding frame complex;

[0154] Stacking: The electrode sheet-bonding frame complex is stacked with the second electrode sheet 22.

[0155] The embodiment of the present application also provides a method for compounding a continuous bonding frame and an electrode sheet, including the following steps:

[0156] Unwinding: The release film 34 connected with the bonding frame 30 is unwound, and the tape carrying the first electrode sheet 21 is unwound, wherein the first bonding layer 31 of the bonding frame 30 faces the tape where the first electrode sheet 21 is located;

[0157] Rolling and compounding: The first electrode sheet 21 and the bonding frame 30 are bonded by rolling to form an electrode sheet-continuous bonding frame complex;

[0158] Cutting: The electrode sheet-continuous bonding frame complex is cut to cut off the connecting portion 35 to form an electrode sheet-continuous bonding frame;

[0159] Stacking: The electrode sheet-continuous bonding frame is stacked with the second electrode sheet 22.

[0160] Exemplarily, the method for compounding the continuous bonding frame and the electrode sheet can be realized by using Figure 7 the electrode sheet processing equipment 2000 shown.

[0161] Exemplarily, as Figure 7 shown, the release film 34 connected with the continuous adhesive frame is unreeled by the release film unreeling mechanism 2001, and the strip carrying the first pole piece 21 is unreeled by the first pole piece unreeling mechanism 2003.

[0162] Exemplarily, as Figure 7 shown, after the release film 34 and the strip are unreeled, they pass through the release roller 2005. The first pole piece 21 and the adhesive frame 30 are roll-pressed and adhered to form a pole piece continuous adhesive frame composite body. The release film 34 is reeled by the release film reeling mechanism 2002, and the cutting mechanism 2006 cuts off the connecting portion 35 of the pole piece continuous adhesive frame composite body to form an individual pole piece adhesive frame composite body.

[0163] Exemplarily, as Figure 7 shown, the second pole piece 22 and the pole piece adhesive frame composite body are laminated at the position of the second pole piece stacking mechanism 2004. Before lamination, the two can be positioned and / or the pole tabs can be cut through the unreeling deviation rectifying device. The embodiments of the present application do not make limitations in this regard.

[0164] In a specific embodiment, the first adhesive layer 31 is a pressure-sensitive hot melt adhesive, which can adhere to the first pole piece 21 under the action of pressure during roll-pressing and compounding.

[0165] The specific solution of the embodiment of the present application will be described below with reference to the accompanying drawings.

[0166] The embodiment of the present application discloses a battery cell 10, including an electrode assembly 12. The electrode assembly 12 includes a plurality of pole piece units 20 stacked along a first direction (Z). The pole piece unit 20 includes a first pole piece 21 and a second pole piece 22 stacked along the first direction (Z). The first pole piece 21 and the second pole piece 22 have opposite polarities. On both sides of either of the first pole piece 21 and the second pole piece 22 along the first direction (Z), a solid electrolyte layer 23 is connected. The first direction (Z) is the thickness direction of the first pole piece 21 and the second pole piece 22. The pole piece unit 20 further includes an adhesive frame 30 sleeved on the outer edge of the second pole piece 22. The inner edge shape of the adhesive frame 30 matches the outer edge shape of the second pole piece 22, and the outer edge shape of the adhesive frame 30 matches the inner edge shape of the first pole piece 21. Along the first direction (Z), both sides of the adhesive frame 30 are adhered to the first pole pieces 21 adjacent along the first direction (Z). The adhesive frame 30 includes a first adhesive layer 31, a base material layer 32, and a second adhesive layer 33 stacked in sequence along the first direction (Z). The first adhesive layer 31 is configured to adhere the second pole piece 22 of the pole piece unit 20 to the first pole piece 21 of the adjacent pole piece unit 20. The base material layer 32 is used to carry the first adhesive layer 31 and the second adhesive layer 33. The second adhesive layer 33 is configured to adhere the second pole piece 22 and the first pole piece 21 of each pole piece unit 20.

[0167] The efficiency of lamination processing is ensured by pre - setting the adhesive frame 30 in advance. The base material layer 32 of the adhesive frame 30 is made of PET. The front and back sides are respectively coated with thermosensitive / pressure - sensitive hot - melt adhesives. Then, the adhesive frame 30 of corresponding size is prepared by die - cutting, and then compounded with the release film 34 into a hot - melt adhesive roll. The thickness of the base material layer 32 is 20 - 100μm, the width of the adhesive frame 30 is 1 - 5mm, the thickness of the adhesive frame 30 is 50 - 300μm, and the main body of the adhesive frame 30 has an R - corner of 1 - 8mm.

[0168] Exemplarily, when processing, multiple adhesive frames 30 can be connected through the connecting part 35, and the width of the connecting part 35 is 10 - 200mm.

[0169] The adhesive frame 30 can be Figure 7 compounded with the pole piece through the pole - piece processing equipment 2000 as shown. The adhesive frame 30 and the first pole piece 21 are unrolled together to ensure that the edge position of the first pole piece 21 adheres to the adhesive frame 30 of corresponding size. Then, it is transported through a suction cup or a conveyor belt, and the second pole piece 22 is stacked in sequence to the corresponding position, forming a pole - piece unit 20 in which the second pole piece 22 is embedded in the adhesive frame 30 directly above the first pole piece 21. Then, they are stacked in sequence to form a stable structure (pole - piece unit 20) in which the first pole piece 21, the second pole piece 22 and the adhesive frame 30 are matched and embedded with each other as shown in Figure 4 figure.

[0170] There is no height difference of plus or minus 10 microns between the position of the adhesive frame 30 and the second pole piece 22, avoiding the short - circuit problem caused by the pressure of 200 - 800 Mpa applied in the isostatic pressing process of the solid - state battery.

[0171] Exemplarily, taking the PET sheet as the base material layer 32, the detailed preparation method of the adhesive frame 30 is as follows:

[0172] Put the PET sheet into the loading position of the coater, and put the pressure - sensitive hot - melt adhesive and the thermosensitive hot - melt adhesive into the coating material box respectively. Use the hot - melt adhesive scraping device to scrape the pressure - sensitive hot - melt adhesive and the thermosensitive hot - melt adhesive on the front and back sides of the PET sheet respectively. After coating, perform die - cutting on the center position and outer contour of the adhesive frame 30 to form the adhesive frame 30.

[0173] Exemplarily, the adhesive frame 30 can be compounded with the release film 34, and deviation correction and winding are carried out to ensure the accurate positioning of the adhesive frame 30 and the release film 34 for the next compounding of the pole piece and the adhesive frame 30.

[0174] Exemplarily, the adhesive frame 30 and the first pole piece 21 are compounded by roll - pressing and conveyed to the stacking table (the second - pole - piece stacking mechanism 2004), corrected by the deviation - correction table, and the second pole piece 22 is grabbed by a suction cup for deviation correction and lamination to form the pole - piece unit 20.

[0175] Optionally, the second pole piece 22 can be fed and the corresponding tab cut by a second pole piece unwinding and rectifying device (not shown). Without special instructions, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0176] Without special instructions, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0177] Without special instructions, all steps of the present application can be carried out sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) carried out sequentially, or may also include steps (b) and (a) carried out sequentially. For example, it is mentioned that the method may further include step (c), indicating that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or may also include steps (a), (c), and (b), or may also include steps (c), (a), and (b), etc.

[0178] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope claimed by the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope claimed.

Claims

1. A battery cell, characterized in that: The invention comprises an electrode assembly, wherein the electrode assembly comprises a plurality of electrode sheet units stacked along a first direction, wherein the electrode sheet unit comprises a first electrode sheet and a second electrode sheet stacked along the first direction, wherein the first electrode sheet and the second electrode sheet have opposite polarities, and both sides of the first electrode sheet and the second electrode sheet along the first direction are connected with a solid electrolyte layer, and the first direction is a thickness direction of the first electrode sheet and the second electrode sheet; The pole piece unit further comprises a bonding frame sleeved on the outer edge of the second pole piece, the inner edge shape of the bonding frame matches the outer edge shape of the second pole piece, and the outer edge shape of the bonding frame matches the inner edge shape of the first pole piece; Along the first direction, two sides of the bonding frame are respectively bonded to the first pole pieces adjacent to each other along the first direction.

2. The battery cell according to claim 1, characterized in that: The bonding frame includes a first bonding layer, a substrate layer, and a second bonding layer which are sequentially stacked along the first direction, the first bonding layer being configured to bond the second pole piece of the pole piece unit to the first pole piece of the adjacent pole piece unit, the substrate layer being used to carry the first bonding layer and the second bonding layer, and the second bonding layer being configured to bond the second pole piece of each pole piece unit to the first pole piece.

3. The battery cell according to claim 2, characterized in that: The difference in thickness between the second pole piece and the bonding frame along the first direction does not exceed 10 μm.

4. The battery cell according to claim 2, characterized in that: The first adhesive layer is a heat-sensitive hot-melt adhesive layer, and the second adhesive layer is a pressure-sensitive hot-melt adhesive layer.

5. The battery cell according to claim 2, characterized in that: Along the second direction, one side of the first pole piece is connected to a first pole lug, and one side of the second pole piece is connected to a second pole lug; the first pole lug and the second pole lug are located on the same side or opposite sides of the second direction, and the second direction is perpendicular to the first direction.

6. The battery cell according to claim 5, characterized in that: The second electrode tab is bent along the first direction toward a side away from the substrate layer.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The first pole piece is a negative pole piece, the second pole piece is a positive pole piece, and the solid electrolyte layer is connected to two sides of the first pole piece along the first direction.

8. The battery cell according to claim 5 or 6, characterized in that: The width of the bonding frame along the second direction is 0.5 mm-5 mm.

9. The battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the bonding frame along the first direction is 50 μm-300 μm, and the thickness of the bonding frame is the same as the thickness of the second pole piece.

10. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 9.

11. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 9 or the battery device according to claim 10, wherein the battery cell or the battery device is used for storing or providing electric energy.

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