Battery monomer, battery device and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to a battery monomer, a battery device and electric equipment. In the embodiment of the invention, the isolating membrane in the electrode assembly is configured to comprise the first part and the second part, the first part can penetrate ions, the second part can block the ions, and the second part covers at least part of the edge area of the main body part. Therefore, the first part can penetrate ions, so that ion conduction can be carried out between the pole pieces, and charging and discharging of the battery are facilitated. As the second part can block ions and at least part of the edge area of the main body part is coated by the second part, the edge area of the main body part can be protected and supported, and the safety of the battery is improved. Therefore, the reliability and the safety of the battery are improved on the whole.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, battery devices and electrical equipment. Background Art

[0002] At present, the electrode assembly in the battery is mainly made by lamination process or winding process, and the laminated electrode assembly has been widely used due to its many advantages, such as high rate, high energy density, etc. However, the performance of the battery using the laminated electrode assembly needs to be further improved. Summary of the invention

[0003] Based on this, the present application provides a battery cell, a battery device and an electrical equipment to improve the performance of the battery.

[0004] In the first aspect, the present application provides a battery cell, including an electrode assembly; the electrode assembly includes: a plurality of pole pieces, stacked along a first direction; the pole piece includes a main body and a pole ear arranged on one side of the main body, the main body having a central area and an edge area arranged around the central area; and an isolation membrane, including a plurality of first parts, and a second part other than the first part, the first part is configured to be permeable to ions, and the second part is configured to be used to block ions. The first part is provided on both sides of the main body along the first direction, the second part covers at least part of the edge area of ​​the main body, and the pole ear extends out of the isolation membrane.

[0005] In the technical solution of the embodiment of the present application, the isolation membrane in the electrode assembly is configured to include a first part and a second part, so that the first part can penetrate ions, the second part can block the separator, and the second part covers at least part of the edge area of ​​the main body. In this way, since the first part can penetrate ions, ion conduction can be carried out between the pole pieces, which is beneficial to the charging and discharging of the battery. Since the second part can block the separator, the migration of ions in the edge area of ​​the main body can be limited, thereby improving the short circuit caused by improper flow of ions. In addition, for lithium batteries, the ion barrier properties of the second part can make it difficult for ions to pass through the second part, which can inhibit the growth of lithium dendrites in the edge area and improve the safety of the battery. Since the second part covers at least part of the edge area of ​​the main body, it can provide protection and support for the edge area of ​​the main body. As a result, the reliability and safety of the battery are improved as a whole.

[0006] In some embodiments, the second portion has a porous structure for blocking spacers.

[0007] By making the second part have a porous structure, the second part has a certain flexibility and mechanical strength. On the one hand, the certain flexibility enables it to better adapt to the shape changes and small displacements of the pole piece during battery assembly and use, and is not easy to break; on the other hand, the certain mechanical strength can effectively protect the edge of the pole piece, disperse the pressure when it is squeezed by external force, and improve the situation where the edge of the pole piece is crushed, thereby extending the service life of the battery. In addition, compared with some methods that achieve ion isolation through complex processes, it is easier to make by constructing a porous structure for blocking separators, which helps to reduce production difficulty and cost and improve production efficiency.

[0008] In some embodiments, the second portion includes closed pores, and the maximum pore size of the closed pores is less than 100 nm.

[0009] By setting closed holes and controlling the maximum aperture of the closed holes, it is not only possible to block the separators, but also to disperse the stress when the battery is squeezed or vibrated by external forces, thereby enhancing the overall structural strength and achieving protection for the electrode.

[0010] In some embodiments, the second portion is configured to be elastic.

[0011] During the battery charging and discharging process, the pole piece will change in volume due to the insertion and extraction of lithium ions. The elastic second part can deform accordingly with the expansion and contraction of the pole piece, so that the second part can keep in contact with the edge of the pole piece, which can not only improve the stability of the battery, but also further help protect the pole piece and extend the service life of the battery. During the battery assembly process, it can further provide support and protection for the edge of the pole piece, improving the manufacturing quality of the electrode assembly.

[0012] In some embodiments, the second portion covers the entire edge region of the main body.

[0013] Since the entire edge area of ​​the main body is covered by the second part, the edge area of ​​the main body is supported by the second part, which further improves the reliability and safety of the battery. During various processes (such as stacking and pressing) in the battery manufacturing process and when the charging and discharging volume changes during use, the pressure can be further dispersed more evenly, improving the deformation, damage or active material shedding of the edge of the pole piece due to local uneven force.

[0014] In some embodiments, the orthographic projection of the central area of ​​the main body on the reference plane is located within the range of the orthographic projection of the first part corresponding to the main body on the reference plane; wherein, the first part corresponding to the main body is the first part arranged on both sides of the main body along the first direction, and the reference plane is a plane perpendicular to the first direction.

[0015] Since the first part is configured to be permeable to ions, the central area of ​​the main body is set corresponding to the first part, which not only enables the ions in the central area to be transmitted more quickly, but also helps to improve the local reaction differences caused by the poor ion transmission path, so that the electrode reaction can be carried out more evenly in the central area, which is beneficial to improve the consistency of the overall performance of the battery, reduce the polarization phenomenon inside the battery, and improve the charging and discharging efficiency and cycle life of the battery.

[0016] In some embodiments, an orthographic projection of a central area of ​​the main body on the reference plane and an orthographic projection of a first portion corresponding to the main body on the reference plane coincide with each other.

[0017] Since the orthographic projection of the central area of ​​the main body completely overlaps with the orthographic projection of the first part, it means that the central area of ​​the main body corresponds entirely to the first part that can penetrate ions. During the battery charging and discharging process, the ion transmission path can be shortened and the battery charging and discharging rate can be improved. At the same time, since the projections overlap, that is, the first parts on both sides of the central area of ​​the main body are symmetrically arranged, when the battery is subjected to external force, the stress can be dispersed more evenly, thereby improving the stability of the battery.

[0018] In some embodiments, the outer contour of the orthographic projection of the main body on the reference surface is arranged around the outer contour of the orthographic projection of the first part corresponding to the main body on the reference surface; the outer contour of the orthographic projection of the main body on the reference surface and the outer contour of the orthographic projection of the first part corresponding to the main body on the reference surface are spaced from 0.3 mm to 2 mm.

[0019] By controlling the size of the main body beyond the size of the first part, that is, the size of the edge area of ​​the main body can be controlled, it is not only convenient to make the isolation membrane, but also the second part can provide support and protection for the edge area of ​​the main body while the battery has a certain charge and discharge efficiency, thereby improving the reliability and safety of the battery.

[0020] In some embodiments, all the first portions and all the pole pieces are alternately stacked along the first direction.

[0021] In this way, not only can the stacking structure be simpler and the manufacturing process easier to control, but the structure of the electrode assembly can also be made more compact, thereby better resisting deformation and improving the stability of the structure.

[0022] In some embodiments, the first part has a first side and a second side arranged opposite to each other along a second direction; the second direction and the first direction intersect each other; along the first direction, the first sides of the two adjacent first parts are connected by means of the second part, and the second sides of the two adjacent first parts are connected by means of the second part.

[0023] In this way, not only can the structure of the electrode assembly be made more compact, but the manufacturing process can also be simplified during the production of the electrode assembly, which is conducive to achieving continuous production and improving production efficiency.

[0024] In some embodiments, all first portions are independent of each other.

[0025] Since all the first parts are independent of each other, two adjacent first parts are separated by the second part. In this way, by controlling the size of the first part relative to the central area of ​​the main body, it is beneficial to support the edge area of ​​the main body through the second part, thereby further improving the reliability and safety of the battery.

[0026] In some embodiments, the second portion includes a plurality of sub-portions, all of the sub-portions are arranged in one-to-one correspondence with all of the first portions, and the sub-portions are arranged around the periphery of the corresponding first portion; along the first direction, two adjacent sub-portions are connected.

[0027] In this way, the second part can roughly correspond to the edge area of ​​the main body, so as to cover the edge area of ​​the main body. At the same time, such a structure also makes the manufacturing of the isolation membrane easier.

[0028] In some embodiments, the sub-portion has a third side and a fourth side arranged opposite to each other along the second direction; the second direction and the first direction intersect each other; along the first direction, the third sides of the two adjacent sub-portions are connected, and the fourth sides of the two adjacent sub-portions are connected.

[0029] In this way, the third side of the previous adjacent sub-section and the fourth side of the next adjacent sub-section along the first direction are alternately connected to form a staggered stable connection structure. In this way, not only can the direct contact between the pole pieces be prevented, but also the supporting force can be provided in both the first direction and the second direction, thereby enhancing the structural stability of the entire electrode assembly.

[0030] In some embodiments, the outer contour of the orthographic projection of the main body on the reference plane is located within the range of the orthographic projection of the sub-portion corresponding to the main body on the reference plane; the sub-portion corresponding to the main body is a sub-portion arranged around the first portion on both sides of the main body along the first direction; the reference plane is a plane perpendicular to the first direction.

[0031] The projection of the main body is within the projection range of the sub-part, which means that the sub-part surrounds the main body from all sides to form a structure that covers the edge area of ​​the main body. When the battery is subjected to external forces, such as squeezing, vibration or falling, the sub-part can disperse and buffer the impact force from all directions, improve the situation where the main body is directly subjected to force and deformed or damaged, thereby protecting the battery structure and extending the battery life.

[0032] In some embodiments, the electrode assembly further includes an electrolyte layer; along the first direction, the electrolyte layer is located at least between two adjacent main body portions.

[0033] The electrolyte layer is located between adjacent main bodies, providing a direct and efficient channel for ions to move between the positive and negative electrodes. During the battery charging and discharging process, ions can quickly pass through the electrolyte layer and migrate from the main body of one electrode to the main body of another electrode, thereby improving the ion transmission efficiency and thus increasing the battery's charge and discharge rate.

[0034] In some embodiments, the electrolyte layer is disposed on at least one side of the first portion along the first direction; and / or, along the first direction, at least one side of at least two adjacent main portions facing each other is provided with an electrolyte layer.

[0035] When the electrolyte layer is provided on at least one side of the first part along the first direction, the electrolyte layer can be produced at the same time as the isolation membrane is produced. When at least one of the sides of at least two adjacent main parts facing each other is provided with an electrolyte layer, the electrolyte layer can be produced at the same time as the pole piece is produced. The electrolyte layer can be flexibly arranged, and no specific restrictions are made here. When the electrolyte layer is provided on the isolation membrane, not only can the production process of the pole piece be simplified and the production of the electrolyte layer be facilitated, but also because the isolation membrane has a certain mechanical strength and flexibility, the electrolyte layer can better adapt to the volume change of the pole piece during the battery charging and discharging process, reduce the damage to the electrolyte layer caused by the volume change of the pole piece, and help maintain the stability of the battery structure. At the same time, when the battery is subjected to external impact or vibration, and in the process of pressing to form an electrode assembly, the isolation membrane and the electrolyte layer thereon can absorb part of the energy, play a buffering role, further protect the pole piece, and thus improve the quality and reliability of the electrode assembly.

[0036] In some embodiments, the first portion has a porous structure capable of allowing ions to pass therethrough.

[0037] The porous structure provides channels for ions to pass through, increases the specific surface area for ion transmission, and achieves efficient ion conduction during the battery charging and discharging process. During the operation of the battery, a small amount of gas may be generated. The porous structure of the first part can allow these gases to be discharged, improve the pressure increase caused by gas accumulation inside the battery, help maintain the pressure balance inside the battery, and improve the safety and stability of the battery. At the same time, the first part can have a certain degree of flexibility and mechanical strength, so that it can better adapt to the shape changes and displacements of the pole pieces during battery assembly and use, and is not easy to break.

[0038] In some embodiments, the first portion includes a plurality of through holes extending therethrough along the first direction.

[0039] In this way, not only can a direct and efficient transmission channel be provided for ions, but also the consistency of the ion transmission direction can be improved, which helps to form a stable and orderly electric field inside the battery and further optimize the ion transmission efficiency.

[0040] In some embodiments, the first portion includes a plurality of partition walls, all of which are connected in a predetermined connection manner and define all of the through holes.

[0041] This not only facilitates the production of the first part, but also helps to improve the structural strength of the first part.

[0042] In some embodiments, each through hole is defined by four partition walls, and a same partition wall is disposed between two adjacent through holes.

[0043] In this way, the first portion can be arranged substantially in a grid shape, thereby improving the mechanical properties of the first portion.

[0044] In some embodiments, the first portion and the second portion are an integrally formed structure.

[0045] In this way, there is no joint gap between the first part and the second part, forming an integral structure, which can enhance the mechanical strength of the entire electrode assembly in different directions, thereby improving the reliability of the battery, and at the same time, it is also convenient to make the isolation membrane.

[0046] In some embodiments, the material of the first part includes one or more of polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene copolymer, polyacrylonitrile, and polymethyl methacrylate; and / or, the material of the second part includes one or more of polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene copolymer, polyacrylonitrile, and polymethyl methacrylate.

[0047] The above material has certain chemical stability, mechanical properties, processing properties and cost advantages. When the material of the first part adopts the above material, it can have good ion transmission performance. When the material of the second part adopts the above material, it can have certain support and flexibility.

[0048] In a second aspect, the present application provides a battery device, comprising a battery cell in any of the above embodiments.

[0049] The advantages possessed by the battery cell in any of the above embodiments are also possessed by the battery device, which will not be described in detail here.

[0050] In a third aspect, the present application provides an electrical device, comprising the battery device in any of the above embodiments.

[0051] The advantages possessed by the battery device in any of the above embodiments are also possessed by the electrical equipment, which will not be elaborated here.

[0052] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0054] Figure 1 A schematic diagram of the structure of a vehicle in some embodiments of the present application;

[0055] Figure 2 is a schematic diagram of the exploded structure of a battery device in some embodiments of the present application;

[0056] Figure 3 A schematic diagram of the exploded structure of a battery cell in some embodiments of the present application;

[0057] Figure 4 is a schematic diagram of a side cross-sectional structure of an electrode assembly in some embodiments of the present application;

[0058] Figure 5 It is a schematic diagram of the structure of the pole piece in some embodiments of the present application;

[0059] Figure 6 A partial cross-sectional structural schematic diagram of the second part in some embodiments of the present application;

[0060] Figure 7 A partial structural schematic diagram of the second part in some other embodiments of the present application;

[0061] Figure 8 Schematic diagram of a projection of a central area of ​​a main body portion and a corresponding projection of a first portion in some embodiments of the present application;

[0062] Fig. 9 A schematic diagram of a partially exploded structure of an electrode assembly in some embodiments of the present application;

[0063] Fig.10This is a schematic structural diagram of an isolation membrane in some embodiments of the present application in an unfolded state;

[0064] Fig.11 It is a schematic cross-sectional structure diagram of a stacked and pressed electrode assembly in some embodiments of the present application;

[0065] Fig.12 It is a schematic structural diagram of the isolation membrane in some other embodiments of the present application in an unfolded state;

[0066] Fig.13 It is a schematic diagram of the structure of the pole piece in some embodiments of the present application cooperating with the isolation membrane in the unfolded state;

[0067] Fig.14 It is a schematic structural diagram of the isolation membrane in some other embodiments of the present application in an unfolded state;

[0068] Fig.15 A schematic diagram of the structure of the isolation membrane in some other embodiments of the present application in an unfolded state;

[0069] Fig.16 It is a schematic diagram of the structure of the battery processing equipment in some embodiments of the present application;

[0070] Fig.17 This is a partial structural schematic diagram of battery processing equipment in some embodiments of the present application.

[0071] Description of reference numerals:

[0072] Vehicle 1;

[0073] Battery device 10, controller 20, motor 30;

[0074] Battery cell 100, shell 110, shell 111, end cover 112, electrode terminal et, electrode assembly 120, pole piece 121, positive pole piece 121a, negative pole piece 121b, main body 1211, central area z1, edge area z2, pole ear 1212, separator 122, first part 1221, through hole tk, partition wall f, first side c1, second side c2, second part 1222, closed hole bk, sub-part p, third side c3, fourth side c4, electrolyte layer 123;

[0075] Box body 200, first box body part 210, second box body part 220;

[0076] Reference surface E, first projection Y1, second projection Y2, third projection Y3, fourth projection Y4, first distance d1, second distance d2;

[0077] Battery processing equipment 1000;

[0078] A first unwinding device 1100, a second unwinding device 1200, a third unwinding device 1300, a first cutting device 1400, a pressing roller device 1500, a second cutting device 1600, a stacking device 1700, a pressing device 1800, and a shelling device 1900;

[0079] Teflon layer x1, coating layer x2, release film layer x3;

[0080] The first direction F1, the second direction F2, and the third direction F3. DETAILED DESCRIPTION

[0081] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0082] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0083] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0084] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0085] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0086] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0087] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0088] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. 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 the specific circumstances.

[0089] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0090] At present, the electrode assembly in the battery is mainly made by a lamination process or a winding process. The laminated electrode assembly has been widely used due to its many advantages, such as high rate, high energy density, etc. However, the performance of batteries using laminated electrode assemblies needs to be further improved. Specifically, during the manufacturing process of the electrode assembly or the use of the battery, there is a risk of damage to the edge area of ​​the electrode sheet. Furthermore, in order to improve the performance of the battery, the size of the negative electrode sheet is set to be larger than the size of the positive electrode sheet in the related art. However, since the part of the negative electrode sheet that protrudes beyond the positive electrode sheet is prone to gaps, the edge area of ​​the electrode sheet is prone to the risk of collapse during the process of pressing to form the electrode assembly. At the same time, during the use of the battery, the edge area of ​​the electrode sheet is also easily damaged when squeezed.

[0091] Based on this, in order to improve the performance of batteries using stacked electrode assemblies, the embodiments of the present application provide a battery cell, a battery device and an electrical equipment, by setting the isolation membrane to include a portion that can penetrate ions and a portion for blocking separators, so that the portion for blocking separators provides buffering and supporting performance for at least a portion of the corresponding edge area, and limits the migration of ions in the edge area of ​​the main body, thereby protecting the edge area of ​​the electrode, and further improving the performance of the battery.

[0092] The battery cell disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery cell disclosed in the present application and other components, which is conducive to improving battery performance.

[0093] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device is a device that uses electric energy as an energy source and realizes corresponding functions by consuming electric energy. Exemplarily, the electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0094] The electric device of the embodiment of the present application may include a device body and a power supply device, the power supply device is used to supply power to the device body, and the power supply device may include a battery cell or a battery pack. The device body refers to a main structure that consumes electric energy to achieve corresponding functions. For example, the electric device may be a mobile phone, the device body is the part that can achieve functions such as communication, and the battery cell or battery pack is used to supply power to the part that can achieve functions such as communication. For example, the electric device may be a car, the device body is the part that can be used for people to sit and can be driven on the road, and the battery cell or battery pack is used to supply power to the part that can be used for people to sit and can be driven on the road. The power supply device refers to a device that can output electric energy. Exemplarily, electric energy can be output by a battery pack composed of battery cells.

[0095] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0096] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of vehicle 1 in some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 can be provided at the bottom, head or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to power the motor 30, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0097] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0098] In order to meet different power requirements, the battery device 10 may include a plurality of battery cells 100, where a battery cell 100 refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 100 can be connected in series and / or in parallel via electrode terminals et for use in various applications. The batteries mentioned in the present application include battery modules or battery packs. Among them, a plurality of battery cells 100 can be connected in series, in parallel, or in mixed connection, where mixed connection refers to a mixture of series and parallel connection. The battery device 10 may also be referred to as a battery pack. In the embodiments of the present application, a plurality of battery cells 100 may directly constitute a battery pack, or may first constitute a battery module, which may then constitute a battery pack.

[0099] Please refer to Figure 2 , Figure 2 It is a schematic diagram of the exploded structure of the battery device 10 in some embodiments of the present application. Figure 2 In the embodiment, the battery device 10 may include a plurality of battery modules and a case 200, and the plurality of battery modules are contained inside the case 200. The case 200 is used to contain the battery cells 100 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 100. The case 200 may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, which is not limited in the embodiments of the present application. The material of the case 200 may be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, which is not limited in the embodiments of the present application.

[0100] In some embodiments, the box 200 may include a first box portion 210 and a second box portion 220, the first box portion 210 and the second box portion 220 cover each other, and the first box portion 210 and the second box portion 220 jointly define a space for accommodating the battery cell 100. The second box portion 220 may be a hollow structure with one end open, the first box portion 210 may be a plate-like structure, and the first box portion 210 covers the open side of the second box portion 220, so that the first box portion 210 and the second box portion 220 jointly define a space for accommodating the battery cell 100. The first box portion 210 and the second box portion 220 may also be hollow structures with one side open, and the open side of the first box portion 210 covers the open side of the second box portion 220.

[0101] The battery module may include a plurality of battery cells 100, and the plurality of battery cells 100 may be first connected in series or in parallel or in a mixed connection to form a battery module, and the plurality of battery modules may then be connected in series or in parallel or in a mixed connection to form a battery. In the present application, the battery cell 100 may include a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery device, etc., which is not limited in the embodiments of the present application. The battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc., which is not limited in the embodiments of the present application. The battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc., which is not limited in the embodiments of the present application. However, for the sake of simplicity of description, the following embodiments are all described using a cubic square battery cell as an example.

[0102] Please refer to Figure 3 , Figure 3 1 is a schematic diagram of the exploded structure of a battery cell 100 in some embodiments of the present application. The battery cell 100 refers to the smallest unit constituting the battery device 10. Figure 3 The battery cell 100 includes a housing 110 , an electrode assembly 120 and other functional components.

[0103] The housing 110 is a component for forming the internal environment of the battery cell 100. The housing 110 may include a shell 111 and an end cap 112. The shell 111 is a component for cooperating with the end cap 112 to form the internal environment of the battery cell 100. Among them, the formed internal environment can be used to accommodate the electrode assembly 120, the electrolyte (not shown in the figure) and other components. Of course, an electrolyte layer can also be provided without an electrolyte, and no specific limitation is made here. The shell 111 and the end cap 112 can be independent components, and an opening can be provided on the shell 111, and the end cap 112 is covered at the opening to form the internal environment of the battery cell 100. Without limitation, the end cap 112 and the shell 111 can also be integrated. Specifically, the end cap 112 and the shell 111 can form a common connection surface before other components are put into the shell, and when the interior of the shell 111 needs to be encapsulated, the end cap 112 is covered with the shell 111. The shell 111 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 111 can be determined according to the specific shape and size of the electrode assembly 120. The material of the shell 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. The opening of the shell 111 can be located at the side or bottom of the shell 111, and the embodiment of the present application does not impose any restrictions on this.

[0104] The end cap 112 refers to a component that can be covered on the opening of the shell 111 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 112 can be adapted to the shape of the shell 111 to match the shell 111. For example, the end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 112 is not easy to deform when it is squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals et can be provided on the end cap 112. The electrode terminal et can be used to electrically connect to the electrode assembly 120 for outputting or inputting electrical energy of the battery cell 100. In some embodiments, the end cap 112 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In some embodiments, the end cap 112 can also be provided with a liquid injection hole for injecting electrolyte into the interior of the battery cell 100. Of course, the electrode terminal et and the injection hole can also be provided on the shell 111. The material of the end cap 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 112, and the insulating member can be used to isolate the electrical connection components in the shell 111 from the end cap 112 to reduce the risk of short circuit. Exemplarily, the material of the insulating member can be plastic, rubber, etc. In some embodiments, a pressure relief mechanism can also be provided on the shell 111 and / or the end cap 112. The pressure relief mechanism is used to release the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold value to improve the safety performance of the battery cell 100. The threshold design varies according to different design requirements. The threshold may depend on one or more materials in the electrode assembly 120 and the isolation member in the battery cell 100. The pressure relief mechanism may take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the pressure relief mechanism executes an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0105] The electrode assembly 120 is a component in the battery cell 100 where an electrochemical reaction occurs. One or more electrode assemblies 120 may be included in the housing 110. The electrode assembly 120 is mainly formed by stacking a positive electrode sheet and a negative electrode sheet, and a separator may be provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 120, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or at both ends of the main body, may be located at the top of the main body, or may be located at the side wall of the main body, and no specific restrictions are made here. During the charge and discharge process of the battery device 10, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal et to form a current loop. The separator is used to isolate the positive electrode sheet and the negative electrode sheet, and prevent the electrons in the battery cell 100 from passing freely, so that the ions in the electrolyte flow freely between the positive electrode sheet and the negative electrode sheet. The material of the isolation film can be PE (polyethylene), PP (polypropylene) and other materials.

[0106] According to some embodiments of this application, please continue to refer to Figure 3 , and combined with reference Figure 4 , Figure 4 This is a schematic diagram of a side cross-sectional structure of an electrode assembly 120 in some embodiments of the present application. The battery cell 100 includes an electrode assembly 120 . The electrode assembly 120 includes a plurality of pole pieces 121 and an isolation membrane 122 .

[0107] A plurality of pole pieces 121 are stacked along the first direction F1. Figure 5 , Figure 5The schematic diagram of the structure of the pole piece 121 in some embodiments of the present application, the pole piece 121 includes a main body 1211 and a pole ear 1212 arranged on one side of the main body 1211, and the main body 1211 has a central area z1 and an edge area z2 arranged around the central area z1. Specifically, the thickness direction of the pole piece 121 and the first direction F1 are parallel to each other. The polarities of the two adjacent pole pieces 121 along the first direction F1 are opposite. The polarity of the pole piece 121 located on the outermost side of the electrode assembly 120 along the first direction F1 can be positive or negative, and can be set according to the specific usage, and no specific restrictions are made here. The central area z1 and the edge area z2 are relative. The central area z1 is usually based on the geometric center of the main body 1211, and radiates to a certain range around the area determined. The edge area z2 surrounds the periphery of the central area z1, and is the part of the main body 1211 close to the edge after removing the central area z1. The edge area z2 of the main body 1211 is adjacent to other components inside the battery cell 100, such as the housing 110. The specific ranges of the central area z1 and the edge area z2 of the main body 1211 can be set according to actual use requirements and are not specifically limited here. However, in general, the central area z1 is the middle part of the main body 1211, and the edge area z2 is the part close to the edge of the main body 1211. Figure 5 In the figure, the central area z1 and the edge area z2 of the main body 1211 are indicated by dotted lines.

[0108] The isolation film 122 includes a plurality of first parts 1221 and a second part 1222 other than the first part 1221. The first part 1221 is configured to be permeable to ions, and the second part 1222 is configured to be used to block ions. The first part 1221 is provided on both sides of the main body 1211 along the first direction F1, the second part 1222 covers at least a portion of the edge area z2 of the main body 1211, and the tab 1212 extends out of the isolation film 122.

[0109] “Ion-permeable” means that the first portion 1221 has a certain microstructure or chemical property, which allows ions to pass through the first portion 1221 under the action of the electric field force. “Ion-blocking” means that the second portion 1222 can block the passage of the isotope.

[0110] Thus, the isolation film 122 in the electrode assembly 120 is configured to include a first part 1221 and a second part 1222, and the first part 1221 can penetrate ions, the second part 1222 can block the separator, and the second part 1222 covers at least part of the edge area z2 of the main body 1211. In this way, since the first part 1221 can penetrate ions, ion conduction can be carried out between the pole pieces 121, which is beneficial to the charging and discharging of the battery. Since the second part 1222 can block the separator, the migration of ions in the edge area z2 of the main body 1211 can be limited, thereby improving the short circuit caused by improper flow of ions. In addition, for lithium batteries, the ion barrier properties of the second part 1222 can make it difficult for ions to pass through the second part, which can inhibit the growth of lithium dendrites in the edge area z2, and improve the safety of the battery. Since the second part 1222 covers at least part of the edge area z2 of the main body 1211, it can provide protection and support for the edge area z2 of the main body 1211. As a result, the reliability and safety of the battery are improved overall.

[0111] According to some embodiments of this application, please continue to refer to Figure 4 , and combined with reference Figure 6 , Figure 6 This is a partial cross-sectional structural schematic diagram of the second portion 1222 in some embodiments of the present application. The second portion 1222 has a porous structure for blocking spacers.

[0112] The porous structure in the second part 1222 may include at least one of through holes, semi-closed holes, and closed holes. Among them, the aperture of the through hole is smaller than the size of the ion, so that the ions face huge steric hindrance when passing through, thereby blocking the ions from passing through. Semi-closed holes refer to a part of the pores that are closed at one end and open at the other end to connect to the outside world or other spaces inside the material. These pores can form a semi-open channel network inside the material. For ions, the semi-closed pore structure increases the difficulty of their passage. Although the open end of the semi-closed pore provides the possibility of ions entering the pore, the closed end prevents the ions from completely passing through the pore, thereby blocking the ions from passing through. Closed holes refer to pores that are completely closed and are not connected to the outside world or other pores inside the material. They are roughly like independent bubbles wrapped in the material. Since the closed pores are completely closed, ions cannot enter the inside of the pores, and there is no possibility of passing through the material from the pores. In other words, the porous structure in the second part 1222 forms a path that blocks the passage of ions.

[0113] For example, Figure 6 As an example, the porous structure in the second part 1222 includes closed pores bk. Figure 7 For example, Figure 7This is a partial structural schematic diagram of the second part 1222 in some other embodiments of the present application, illustrating the situation where the porous structure in the second part 1222 includes through holes, and the second part 1222 is generally arranged in a mesh structure. Of course, the porous structure in the second part 1222 may also include closed holes and through holes, and may also include closed holes, semi-closed holes and through holes, which are not specifically limited here.

[0114] The porous structure in the second portion 1222 can be detected by a scanning electron microscope (SEM). For example, the second portion 1222 can be sliced, and a surface microscopic image at the surface of the slice can be obtained by a scanning electron microscope. The generated image can show the surface morphology, pore wall structure and other features of the porous structure.

[0115] By making the second part 1222 have a porous structure, the second part 1222 has a certain flexibility and mechanical strength. On the one hand, the certain flexibility enables it to better adapt to the shape changes and small displacements of the pole piece 121 during the assembly and use of the battery, and is not easy to break; on the other hand, the certain mechanical strength can effectively protect the edge of the pole piece 121, disperse the pressure when it is squeezed by external force, and improve the situation where the edge of the pole piece 121 is crushed, thereby extending the service life of the battery. In addition, compared with some methods of achieving ion isolation through complex processes, it is easier to make by constructing a porous structure for blocking ions (such as a stretching process), which helps to reduce production difficulty and cost and improve production efficiency.

[0116] In some other embodiments, the second part 1222 may also be a continuous dense layer structure, for example, the second part 1222 may be a continuous and dense film or coating structure without obvious pores. The second part 1222 may also be a multi-layer composite structure, for example, the second part 1222 may be composed of a plurality of material layers with different functions. Of course, the second part 1222 may also be configured as other structures that can be used to block spacers, which is not specifically limited here.

[0117] According to some embodiments of this application, please continue to refer to Figure 6 The second portion 1222 includes closed pores bk, and the maximum pore size of the closed pores bk is less than 100 nm.

[0118] The pore size of a closed cell bk refers to the maximum linear dimension of the closed cell bk in a certain direction. For closed cells bk of regular shape, such as spherical closed cells bk, the pore size is the diameter of the sphere; for closed cells bk that are approximately cylindrical, the pore size can be understood as the diameter of the cylinder. For closed cells bk of irregular shape, the largest linear dimension among the linear dimensions in different directions is taken as the maximum pore size of the closed cell bk. The number of closed cells bk can be multiple, and the pore sizes of all closed cells bk can be multiple. The size of the closed cell bk can be measured by a scanning electron microscope (SEM) as illustrated in some of the aforementioned embodiments.

[0119] For example, the pore size of the closed cell bk may be 90 nm, 80 nm, 85 nm, 70 nm, 63 nm, 50 nm, 35 nm or 20 nm, without any specific limitation.

[0120] By setting the closed hole bk and controlling the maximum aperture of the closed hole bk, not only can the spacer be blocked, but also the stress can be dispersed when the battery is squeezed or vibrated by external force, thereby enhancing the overall structural strength and protecting the electrode 121.

[0121] According to some embodiments of this application, please continue to refer to Figure 4 , the second portion 1222 is configured to be elastic.

[0122] When the second portion 1222 is configured to be elastic, it means that the second portion 1222 can be deformed when subjected to a force, and can at least partially recover after the external force is removed.

[0123] Thus, during the battery charging and discharging process, the pole piece 121 will undergo a volume change due to the insertion and extraction of lithium ions. The elastic second portion 1222 can deform accordingly with the expansion and contraction of the pole piece 121, so that the second portion 1222 can be kept in contact with the edge of the pole piece 121, thereby not only improving the stability of the battery, but also further protecting the pole piece 121 and extending the service life of the battery. During the battery assembly process, the edge of the pole piece 121 can be further supported and protected, thereby improving the manufacturing quality of the electrode assembly 120.

[0124] According to some embodiments of this application, please continue to refer to Figure 4 The second portion 1222 covers the entire edge area z2 of the main body 1211.

[0125] Since the entire edge area z2 of the main body 1211 is covered by the second part 1222, the edge area z2 of the main body 1211 is supported by the second part 1222, further improving the reliability and safety of the battery. During various processes (such as stacking and pressing) in the battery manufacturing process and when the charging and discharging volume changes during use, the pressure can be further dispersed more evenly, improving the deformation, damage or active material shedding of the edge of the pole piece 121 due to uneven local force.

[0126] Of course, in some other embodiments, the second portion 1222 may cover the edge region z2 of the main body 1211. In this case, the edge region z2 of the main body 1211 may be supported by the second portion 1222, which may also improve the stress of the pole piece 121 to a certain extent.

[0127] According to some embodiments of this application, please continue to refer to Figure 4 , and combined with reference Figure 8 , Figure 8 Schematic diagram of the projection of the central area z1 of the main body 1211 and the corresponding projection of the first part 1221 in some embodiments of the present application, the orthographic projection of the central area z1 of the main body 1211 on the reference plane E is located within the orthographic projection range of the first part 1221 corresponding to the main body 1211 on the reference plane E. The first part 1221 corresponding to the main body 1211 is the first part 1221 provided on both sides of the main body 1211 along the first direction F1, and the reference plane E is a plane perpendicular to the first direction F1.

[0128] The orthographic projection of the central area z1 of the main body 1211 on the reference plane E is the first projection Y1, and the orthographic projection of the first part 1221 on the reference plane E is the second projection Y2. Figure 8 For example, the first projection Y1 can completely overlap with the corresponding second projection Y2, and the areas of the orthographic projections of the two are equal. The first projection Y1 can also be located within the corresponding second projection Y2, and the area of ​​the first projection Y1 is smaller than the area of ​​the corresponding second projection Y2.

[0129] There are two first parts 1221 corresponding to the main body 1211, and the orthographic projections of the two first parts 1221 on the reference plane E may partially overlap or completely overlap, and no specific restrictions are made here. That is to say, the sizes of the two first parts 1221 may be the same or different. Exemplarily, the orthographic projections of all the main bodies 1211 and all the first parts 1221 on the reference plane E may completely overlap with each other, or substantially completely overlap. "Substantially completely overlap" means that there may be errors in the lamination process or there may be dimensional errors in the pole piece 121, resulting in the orthographic projections of all the main bodies 1211 and all the first parts 1221 on the reference plane E not completely overlapping. Of course, the orthographic projections of all the main bodies 1211 and all the first parts 1221 on the reference plane E may partially overlap. In the case of complete overlap or substantially complete overlap as mentioned above, it is not only convenient to make the isolation film 122, but also conducive to improving the charging and discharging efficiency of the battery through the first part 1221.

[0130] In this way, since the first part 1221 is configured to be permeable to ions, the central area z1 of the main body 1211 is set corresponding to the first part 1221, which not only enables the ions in the central area z1 to be transmitted more quickly, but also helps to improve the local reaction differences caused by the poor ion transmission path, so that the electrode reaction can be carried out more evenly in the central area z1, which is beneficial to improve the consistency of the overall performance of the battery, reduce the polarization phenomenon inside the battery, and improve the charging and discharging efficiency and cycle life of the battery.

[0131] According to some embodiments of this application, please continue to refer to Figure 4 and Figure 8 , the orthographic projection of the central area z1 of the main body 1211 on the reference plane E and the orthographic projection of the first part 1221 corresponding to the main body 1211 on the reference plane E coincide with each other. That is, the first projection Y1 and the second projection Y2 coincide with each other. This means that the orthographic projections of the two first parts 1221 corresponding to the main body 1211 on the reference plane E also coincide with each other.

[0132] Since the orthographic projection of the central area z1 of the main body 1211 completely overlaps with the orthographic projection of the first part 1221, it means that the central area z1 of the main body 1211 corresponds entirely to the first part 1221 that can penetrate ions. During the battery charging and discharging process, the ion transmission path can be shortened and the battery charging and discharging rate can be improved. At the same time, since the projections overlap, that is, the first parts 1221 located on both sides of the central area z1 of the main body 1211 are symmetrically arranged, when the battery is subjected to external force, the stress can be dispersed more evenly, thereby improving the stability of the battery.

[0133] According to some embodiments of this application, please continue to refer to Figure 4 and Figure 8, the outer contour of the orthographic projection of the main body 1211 on the reference plane E is arranged around the outer contour of the orthographic projection of the first part 1221 corresponding to the main body 1211 on the reference plane E. The spacing between the outer contour of the orthographic projection of the main body 1211 on the reference plane E and the outer contour of the orthographic projection of the first part 1221 corresponding to the main body 1211 on the reference plane E is 0.3 mm to 2 mm.

[0134] The orthographic projection of the main body 1211 on the reference plane E is the third projection Y3. Since the outer contour of the third projection Y3 is arranged around the outer contour of the corresponding first projection Y1, that is, the first projection Y1 is located within the range of the third projection Y3. Since there is a gap between the outer contour of the third projection Y3 and the outer contour of the corresponding first projection Y1, that is, the area defined between the outer contour of the third projection Y3 and the outer contour of the corresponding first projection Y1, the area on the main body 1211 corresponding to the area can be roughly regarded as the edge area z2 of the main body 1211.

[0135] Exemplarily, the distance between the outer contour of the orthographic projection of the main body 1211 on the reference plane E and the outer contour of the orthographic projection of the first part 1221 corresponding to the main body 1211 on the reference plane E is the first distance d1. The first distance d1 can be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm, 1.9mm or 2mm, which is not specifically limited here.

[0136] By controlling the size of the main body 1211 beyond the first part 1221, that is, the size of the edge area z2 of the main body 1211 can be controlled, not only is it convenient to make the isolation membrane 122, but also the second part 1222 can provide support and protection for the edge area z2 of the main body 1211 while the battery has a certain charge and discharge efficiency, thereby improving the reliability and safety of the battery.

[0137] According to some embodiments of this application, please continue to refer to Figure 4 All the first parts 1221 and all the pole pieces 121 are alternately stacked along the first direction F1.

[0138] That is, all first parts 1221 and all pole pieces 121 form a stacked structure of first part 1221, pole piece 121, first part 1221, pole piece 121, first part 1221, pole piece 121, first part 1221, ... The polarities of two pole pieces 121 adjacent to each other along the first direction F1 are opposite. The polarity of the pole piece 121 located at the outermost side along the first direction F1 can be positive or negative. For example, Figure 4As an example, the outermost electrode sheet 121 along the first direction F1 is shown as the negative electrode sheet 121b. The sizes of the positive electrode sheet 121a and the negative electrode sheet 121b can be the same or different. Figure 4 For example, the case where the size of the negative electrode sheet 121b is larger than the size of the positive electrode sheet 121a is illustrated. This is beneficial to inhibit the growth of lithium dendrites and help reduce concentration polarization and electrochemical polarization, thereby making the battery voltage more stable during the charge and discharge process and improving the charge and discharge efficiency of the battery.

[0139] Since a first part 1221 is provided between two adjacent pole pieces 121, not only can the stacking structure be simpler and the manufacturing process be easier to control, but the structure of the electrode assembly 120 can also be made more compact, thereby better resisting deformation and improving structural stability.

[0140] Of course, in some other embodiments, a plurality of first portions 1221 may be provided between two adjacent pole pieces 121, and the plurality of first portions 1221 may be arranged along the first direction F1 or along a direction perpendicular to the first direction F1, and no specific limitation is made here. Providing a first portion 1221 between two adjacent pole pieces 121 is more conducive to making full use of the space between the two adjacent pole pieces 121, and further conducive to improving the performance of the battery.

[0141] According to some embodiments of this application, please continue to refer to Figure 4 , and combined with reference Fig. 9 , Fig. 9 This is a schematic diagram of a partially exploded structure of an electrode assembly 120 in some embodiments of the present application, wherein a first portion 1221 has a first side c1 and a second side c2 disposed opposite to each other along a second direction F2. The second direction F2 and the first direction F1 intersect with each other. Along the first direction F1, the first sides c1 of the first two adjacent first portions 1221 are connected by means of the second portion 1222, and the second sides c2 of the second two adjacent first portions 1221 are connected by means of the second portion 1222.

[0142] For example, Figure 4 For example, the first direction F1 is the thickness direction of the pole piece 121, the second direction F2 and the third direction F3 may be the length direction and the width direction of the pole piece 121, respectively, and the first direction F1, the second direction F2 and the third direction F3 may be perpendicular to each other. Fig. 9 In order to conveniently illustrate the connection structure of two adjacent first parts 1221, some structures are decomposed and the positions of corresponding parts are adjusted.

[0143] Combined with reference Fig. 9, along the first direction F1, a structural form in which "two adjacent first sides c1 are connected" and "two adjacent second sides c2" are alternately arranged is formed. Fig.10 , Fig.10 1 is a schematic diagram of the structure of the isolation film 122 in some embodiments of the present application in an expanded state. It can be seen that after forming the isolation film 122 in the embodiment of the present application, Fig. 9 In the case of the structure of the isolation film 122 shown in the figure, the isolation film 122 can be made to be as follows in the unfolded state. Fig.10 In this way, it can be made into a strip as shown. Fig.10 The strip-shaped member shown in the figure can form a stacked and pressed electrode assembly 120 by bending the separator 122 during the lamination process. Fig.11 , Fig.11 FIG. 1 is a schematic cross-sectional view of the stacked and pressed electrode assembly 120 in some embodiments of the present application. Fig.11 The stacked and pressed electrode assembly 120 shown in the figure is subjected to a pressing process to form a Figure 4 An electrode assembly 120 is shown.

[0144] In this way, not only can the structure of the electrode assembly 120 be made more compact, but the manufacturing process can also be simplified during the production of the electrode assembly 120, which is conducive to achieving continuous production and improving production efficiency.

[0145] According to some embodiments of this application, please continue to refer to Figure 4 , Fig. 9 and Fig.10 , all first parts 1221 are independent of each other.

[0146] “Independent of each other” means that all first parts 1221 are not directly connected to each other. Fig.10 As an example, the first part 1221 is surrounded by the second part 1222, and two adjacent first parts 1221 are connected and separated by the second part 1222. Fig.12 For example, Fig.12 This is a schematic diagram of the structure of the isolation film 122 in some other embodiments of the present application in an unfolded state, illustrating a situation where the part around the first part 1221 is surrounded by the second part 1222, and two adjacent first parts 1221 are connected and separated by the second part 1222. Of course, it is also possible that the part around a part of the first part 1221 is surrounded by the second part 1222, and the part around another part of the first part 1221 is surrounded by the second part 1222, and there is no specific limitation here, as long as the first parts 1221 are independent of each other.

[0147] Since all the first parts 1221 are independent of each other, two adjacent first parts 1221 are separated by the second part 1222. In this way, by controlling the size of the first part 1221 relative to the central area z1 of the main body 1211, it is beneficial to support the edge area z2 of the main body 1211 through the second part 1222, thereby further improving the reliability and safety of the battery.

[0148] According to some embodiments of this application, please continue to refer to Fig. 9 and Fig.10 The second portion 1222 includes a plurality of sub-portions p, all of the sub-portions p are arranged in one-to-one correspondence with all of the first portions 1221, and the sub-portions p are arranged around the outer periphery of the corresponding first portion 1221. Along the first direction F1, two adjacent sub-portions p are connected.

[0149] exist Fig.10 In FIG. 1 , the boundary between two adjacent sub-portions p is indicated by a dotted line, and the sub-portion p is arranged around the outer periphery of the corresponding first portion 1221, so that the first portion 1221 is located in the middle of the isolation film 122 in the unfolded state and is not located at the edge of the isolation film 122. In this way, in combination with reference Fig.13 , Fig.13 The schematic diagram of the structure of the pole piece 121 in some embodiments of the present application cooperating with the isolation film 122 in the unfolded state, the first part 1221 can be arranged roughly corresponding to the central area z1 of the main body 1211, and the second part 1222 can be arranged roughly corresponding to the edge area z2 of the main body 1211. Fig.13 In the figure, the pole pieces 121 are distributed on both sides of the isolation membrane 122. The pole pieces 121 located on the back side of the isolation membrane 122 in the figure are indicated by dotted lines, and the pole pieces 121 located on the front side of the isolation membrane 122 in the figure are indicated by solid lines. The pole pieces 121 located on the back side and the front side of the isolation membrane 122 are alternately arranged.

[0150] In this way, the second portion 1222 can substantially correspond to the edge region z2 of the main body 1211, thereby covering the edge region z2 of the main body 1211. At the same time, such a structure also makes the manufacturing of the isolation film 122 easier.

[0151] According to some embodiments of this application, please continue to refer to Fig. 9 The sub-part p has a third side c3 and a fourth side c4 arranged opposite to each other along the second direction F2. The second direction F2 and the first direction F1 intersect each other. Along the first direction F1, the third sides c3 of the first two adjacent sub-parts p are connected, and the fourth sides c4 of the second two adjacent sub-parts p are connected.

[0152] In this way, the third side c3 of the previous adjacent sub-part p and the fourth side c4 of the next adjacent sub-part p along the first direction F1 are alternately connected to form a staggered stable connection structure. In this way, not only can the direct contact between the pole pieces 121 be prevented, but also the supporting force can be provided in both the first direction F1 and the second direction F2, thereby enhancing the structural stability of the entire electrode assembly 120.

[0153] According to some embodiments of this application, please continue to refer to Figure 4 , Figure 8 , Fig. 9 , Fig.11 and Fig.13 , the outer contour of the orthographic projection of the main body 1211 on the reference plane E is located within the orthographic projection range of the sub-portion p corresponding to the main body 1211 on the reference plane E. The sub-portion p corresponding to the main body 1211 is the sub-portion p arranged around the first portion 1221 arranged on both sides of the main body 1211 along the first direction F1. The reference plane E is a plane perpendicular to the first direction F1.

[0154] The orthographic projection of the main body 1211 on the reference plane E is the third projection Y3, and the orthographic projection of the sub-portion p on the reference plane E is the fourth projection Y4. The outer contour of the third projection Y3 and the outer contour of the fourth projection Y4 may coincide with each other, or there may be a gap between the outer contour of the third projection Y3 and the outer contour of the fourth projection Y4. When there is a gap between the outer contour of the third projection Y3 and the outer contour of the fourth projection Y4, the sub-portion p may at least cover the side of the edge region z2 of the main body 1211. Combined with reference Fig.13 , Fig.13 The first spacing d1 mentioned above is illustrated in FIG. The spacing between the sub-portion p and the edge area z2 of the main body 1211 can be combined with the second spacing d2 illustrated in FIG. The size of the second spacing d2 can be determined according to the size of the area to be covered and the thickness of the main body 1211, and is not specifically limited here.

[0155] Exemplarily, the shapes and sizes of all the first parts 1221 can be set to be the same, and the size of the positive electrode sheet 121a is smaller than the size of the negative electrode sheet 121b. Fig.13 ,exist Fig.13From the perspective of , the outer contour of the positive electrode sheet 121a is arranged around the outer contour of the corresponding first part 1221, and the spacing between the outer contour of the positive electrode sheet 121 and the outer contour of the corresponding first part 1221 can be 0.3mm to 2mm. The outer contour of the negative electrode sheet 121b is surrounded by the outer contour of the corresponding sub-part p, and the spacing between the outer contour of the negative electrode sheet 121b and the outer contour of the corresponding sub-part p can be 0.3mm to 2mm. The length and width of the negative electrode sheet 121b can be greater than the length and width of the positive electrode sheet 121a by 0.3mm to 2mm. In this way, it is roughly formed that the area of ​​the first part 1221 is smaller than the area of ​​the positive electrode sheet 121a, the area of ​​the positive electrode sheet 121a is smaller than the area of ​​the negative electrode sheet 121b, and the area of ​​the negative electrode sheet 121b is smaller than the area of ​​the sub-part p, so that each electrode sheet can be wrapped by the isolation film 122. Of course, the area of ​​the negative electrode sheet 121b can also be equal to the area of ​​the sub-portion p, and the negative electrode sheet 121b does not exceed the range of the sub-portion p. In this case, the edge area z2 corresponding to the positive electrode sheet 121a can be at least partially covered by the sub-portion p, and the corresponding edge area z2 in the formed electrode assembly 120 can also be supported by the sub-portion p. The relevant size settings of the first portion 1221, the second portion 1222, the positive electrode sheet 121a and the negative electrode sheet 121b are not specifically limited here, as long as the force condition of the electrode sheet 121 is improved.

[0156] Understandably, Fig.11 For example, the laminated electrode assembly 120 is pressed, and the pressed electrode assembly 120 can be combined with reference Figure 4 Thus, the size of the portion of the sub-portion p that exceeds the corresponding main portion 1211 may change when viewed from the first direction F1 before and after lamination of the stacked electrode assembly 120. At the same time, according to different lamination methods, the portion of the negative electrode sheet 121b that exceeds the positive electrode sheet 121a may be bent or displaced after lamination, which is not specifically limited here.

[0157] In this way, the projection of the main body 1211 is within the projection range of the sub-part p, which means that the sub-part p surrounds the main body 1211 from all sides to form a structure that covers the edge area z2 of the main body 1211. When the battery is subjected to external forces, such as squeezing, vibration or falling, the sub-part p can disperse and buffer the impact forces from all directions, improve the situation where the main body 1211 is directly subjected to force and deformed or damaged, thereby protecting the battery structure and extending the battery life.

[0158] According to some embodiments of this application, please continue to refer to Figure 4 and Fig.11 The electrode assembly 120 further includes an electrolyte layer 123. Along the first direction F1, the electrolyte layer 123 is at least located between two adjacent main body portions 1211.

[0159] The electrolyte layer 123 is a material layer capable of conducting ions. The electrolyte layer 123 may be an inorganic solid electrolyte, an organic solid electrolyte, or a composite solid electrolyte. The inorganic solid electrolyte may include an oxide solid electrolyte and a sulfide solid electrolyte. The organic solid electrolyte may include a polyoxyethylene polymer electrolyte, etc. This is not specifically limited.

[0160] The electrolyte layer 123 is located between adjacent main bodies 1211, providing a direct and efficient channel for ions to move between the positive and negative electrodes 121b. During the battery charge and discharge process, ions can quickly pass through the electrolyte layer 123 to achieve migration from the main body 1211 of one electrode 121 to the main body 1211 of another electrode 121, thereby improving the ion transmission efficiency and thus improving the battery charge and discharge rate.

[0161] In addition, when the electrolyte layer 123 is used in the battery cell 100 to form a solid-state battery, a greater pressure (for example, 300Mpa-800Mpa) will be used during the pressing process, and the risk of crushing the edge of the pole piece 121 is greater. When the isolation membrane 122 provided in the embodiment of the present application is used, the second part 1222 provides support and protection for the edge area z2 of the main body 1211 of the pole piece 121, which can reduce the risk of crushing the edge of the pole piece 121, thereby improving the yield of the solid-state battery. Of course, in the battery cell 100 using an electrolyte, the isolation membrane 122 can also improve the battery yield. It can be understood that compared to a solid-state battery including a positive and negative pole piece and an electrolyte layer provided on the pole piece, when the isolation membrane 122 provided in the embodiment of the present application is used, the overlap of the end faces of the positive and negative pole pieces during pressing can also be improved.

[0162] According to some embodiments of this application, please continue to refer to Figure 4 and Fig.11 The electrolyte layer 123 is disposed on at least one side of the first portion 1221 along the first direction F1; and / or, along the first direction F1, at least one side of at least two adjacent main body portions 1211 facing each other is provided with the electrolyte layer 123.

[0163] For example, Figure 4 and Fig.11 For example, an electrolyte layer 123 is provided between two adjacent main bodies 1211 along the first direction F1, and an electrolyte layer 123 is provided between the outermost main body 1211 and the first portion 1221 along the first direction F1. The electrolyte layer 123 can be provided on the main body 1211 or on the first portion 1221 of the isolation membrane 122. Fig.14 For example, Fig.14FIG. 1 is a schematic diagram of a structure of an isolation membrane 122 in an expanded state in some other embodiments of the present application, illustrating a situation where electrolyte layers 123 are provided on both sides of the first portion 1221 of the isolation membrane 122. Fig.15 For example, Fig.15 This is a schematic structural diagram of the isolation membrane 122 in some other embodiments of the present application in an unfolded state, illustrating a situation where an electrolyte layer 123 is provided on one side of the first portion 1221 of the isolation membrane 122. No specific limitation is made here.

[0164] When the electrolyte layer 123 is provided on at least one side of the first part 1221 along the first direction F1, the electrolyte layer 123 can be manufactured at the same time as the isolation membrane 122 is manufactured. When the electrolyte layer 123 is provided on at least one side of at least two adjacent main body parts 1211 facing each other, the electrolyte layer 123 can be manufactured at the same time as the pole piece 121 is manufactured. The electrolyte layer 123 can be flexibly arranged, and no specific restrictions are made here. When the electrolyte layer 123 is provided on the isolation membrane 122, not only can the manufacturing process of the pole piece 121 be simplified and the electrolyte layer 123 can be easily manufactured, but also because the isolation membrane 122 has a certain mechanical strength and flexibility, the electrolyte layer 123 can better adapt to the volume change of the pole piece 121 during the battery charging and discharging process, reduce the damage to the electrolyte layer 123 caused by the volume change of the pole piece 121, and help maintain the stability of the battery structure. At the same time, when the battery is subjected to external impact or vibration, and during the process of pressing to form the electrode assembly 120, the isolation membrane 122 and the electrolyte layer 123 thereon can absorb part of the energy, play a buffering role, and further protect the electrode piece 121, thereby improving the quality and reliability of the electrode assembly 120.

[0165] Of course, in other embodiments, an electrolyte may be used in the battery cell 100 , which is not specifically limited herein.

[0166] According to some embodiments of this application, please continue to refer to Fig.10 , the first portion 1221 has a porous structure that allows ions to pass through.

[0167] A porous structure that allows ions to pass through refers to a material in which the pores are interconnected or partially interconnected to form channels through which ions can pass.

[0168] The porous structure provides channels for ions to pass through, increases the specific surface area for ion transmission, and realizes efficient ion conduction during the battery charging and discharging process. During the operation of the battery, a small amount of gas may be generated. The porous structure of the first part 1221 can allow these gases to be discharged, improve the pressure increase caused by gas accumulation inside the battery, help maintain the pressure balance inside the battery, and improve the safety and stability of the battery. At the same time, the first part 1221 can have a certain degree of flexibility and mechanical strength, and can better adapt to the shape change and displacement of the pole piece 121 during the assembly and use of the battery, and is not easy to break.

[0169] According to some embodiments of this application, please continue to refer to Fig.10 The first portion 1221 includes a plurality of through holes tk penetrating along the first direction F1. In this way, the first portion 1221 can be substantially arranged in a mesh shape.

[0170] In this way, not only can a direct and efficient transmission channel be provided for ions, but also the consistency of the ion transmission direction can be improved, which helps to form a stable and orderly electric field inside the battery and further optimize the ion transmission efficiency.

[0171] In the case where the electrolyte layer 123 is arranged on the first part 1221 as illustrated in some of the aforementioned embodiments, when the electrolyte layer 123 is arranged on the first part 1221 through a coating process, part of the electrolyte layer 123 can penetrate into the multiple through holes tk, which can enhance the bonding force between the electrolyte layer 123 and the first part 1221 and improve the ion transmission performance.

[0172] According to some embodiments of this application, please continue to refer to Fig.10 The first part 1221 includes a plurality of partition walls f, and all the partition walls f are connected in a preset connection manner and define all the through holes tk.

[0173] The preset connection mode refers to the connection mode between the partition walls f, which can form the structure of the desired through hole tk.

[0174] In this way, it is not only convenient to manufacture the first part 1221 , but also beneficial to improve the structural strength of the first part 1221 .

[0175] According to some embodiments of this application, please continue to refer to Fig.10 Each through hole tk is surrounded and defined by four partition walls f, and the same partition wall f is disposed between two adjacent through holes tk.

[0176] In this way, the first portion 1221 can be arranged substantially in a grid shape, thereby improving the mechanical properties of the first portion 1221. Exemplarily, the porous structure in the first portion 1221 can be formed by a stretching process.

[0177] According to some embodiments of this application, please continue to refer to Fig.10 The first part 1221 and the second part 1222 are an integrally formed structure.

[0178] In this way, there is no joint gap between the first part 1221 and the second part 1222 , forming an integral structure, which can enhance the mechanical strength of the entire electrode assembly 120 in different directions, thereby improving the reliability of the battery, and at the same time, it is also convenient to manufacture the isolation membrane 122 .

[0179] It is understood that when the porous structure in the first part 1221 and the porous structure in the second part 1222 illustrated in some of the aforementioned embodiments are formed by a stretching process, the porous structures of different structures can be formed by controlling the stretching rate, stretching multiple, shaping treatment temperature and other parameters in the stretching process, and no specific restrictions are made here. The meshed first part 1221 and the meshed second part 1222 have high strength and modulus. The structure that allows ions to pass or blocks ions can be formed by controlling the density of the meshed first part 1221 and the meshed second part 1222.

[0180] Of course, in some other embodiments, the first part 1221 and the second part 1222 may be connected by splicing, which is not specifically limited here.

[0181] According to some embodiments of this application, please continue to refer to Fig.10 The material of the first part 1221 includes one or more of polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene copolymer, polyacrylonitrile, and polymethyl methacrylate; and / or the material of the second part 1222 includes one or more of polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene copolymer, polyacrylonitrile, and polymethyl methacrylate.

[0182] The above materials have certain chemical stability, mechanical properties, processing properties and cost advantages. When the material of the first part 1221 adopts the above materials, it can have good ion transmission performance. When the material of the second part 1222 adopts the above materials, it can have certain support and flexibility. The material of the first part 1221 and the material of the second part 1222 can be the same or different. When the material of the first part 1221 and the material of the second part 1222 are the same, the isolation membrane 122 can be manufactured by the aforementioned stretching process, thereby facilitating the manufacture of the isolation membrane 122.

[0183] The following is an illustrative description of the method for manufacturing the battery cell 100 provided in the embodiment of the present application in combination with some of the embodiments of the battery cell 100 illustrated above, but is not limited thereto.

[0184] Exemplarily, the method for manufacturing the battery cell 100 includes the following steps:

[0185] Step S110, manufacturing the isolation film 122 by a stretching process; wherein the isolation film 122 includes a plurality of first portions 1221 and a second portion 1222 other than the first portion 1221, the first portion 1221 is configured to be permeable to ions, and the second portion 1222 is configured to be used for blocking ions;

[0186] Step S120, forming an electrolyte layer 123 on the first portion 1221 of the isolation membrane 122;

[0187] Step S130, compounding the positive electrode sheet 121a and the negative electrode sheet 121b onto the separator 122 provided with the electrolyte layer 123 to form a composite member; wherein the positive electrode sheet 121a is located on one side of the separator 122, and the negative electrode sheet 121b is located on the other side of the separator 122, and the positive electrode sheet 121a and the negative electrode sheet 121b are alternately arranged along the length direction of the separator 122;

[0188] Step S140, folding the composite member to form an electrode assembly 120 to be pressed;

[0189] Step S150, performing a pressing process on the electrode assembly 120 to be pressed to form the electrode assembly 120;

[0190] Step S160 , inserting the electrode assembly 120 into the receiving cavity of the housing 110 to form a battery cell 100 .

[0191] In step S110, the reference Fig.10 The present invention can be understood by referring to the isolation film 122 in some of the above embodiments, but is not limited thereto. Fig.14 and Fig.15 For example, an electrolyte layer 123 may be provided on the electrode sheet 121 .

[0192] In step S130 and step S140, reference may be made to Fig. 9 and Fig.11To understand, but not limited to this; wherein the folding method can be a Z-shaped folding method. Before the positive electrode sheet 121a and the negative electrode sheet 121b are compounded to the separator 122 provided with the electrolyte layer 123, the positive electrode sheet strip and the negative electrode sheet strip can be processed by die cutting or cutting, and then the die-cut or cut negative electrode sheet 121b and the positive electrode sheet 121a can be positioned by a manipulator with the aid of a visual module (such as a CCD component), and the die-cut or cut negative electrode sheet 121b and the positive electrode sheet 121a are placed on different sides of the separator 122. Furthermore, it is also possible to correct it first by a deviation correction roller, and then heat press compound it by a heating roller. The negative electrode sheet 121b and the positive electrode sheet 121a can be fixed to the separator 122 by an adhesive layer. Accordingly, a glue spraying mechanism can be set up to spray glue on the corresponding surface to form an adhesive layer. Of course, other composite methods can also be used, which are not specifically limited here.

[0193] Exemplarily, the distance between the central axis of the deviation correction roller and the central axis of the heating roller is smaller than the width of the pole piece 121. The heating temperature of the heating roller may be 25° C. to 120° C., and the pressure may be 100 kgf to 500 kgf. No specific limitation is given here.

[0194] In step S150, refer to Figure 4 In step S160, reference may be made to Figure 3 To understand, but not limited to this.

[0195] The battery processing equipment 1000 provided in the embodiment of the present application is exemplarily described below in combination with some implementation modes and manufacturing methods of the battery cell 100 illustrated above, but is not limited thereto.

[0196] According to some embodiments of this application, please refer to Fig.16 and Fig.17 , Fig.16 is a schematic diagram of the structure of a battery processing device 1000 in some embodiments of the present application, Fig.17 This is a partial structural schematic diagram of the battery processing equipment 1000 in some embodiments of the present application. The battery processing equipment 1000 includes a first unwinding device 1100, a second unwinding device 1200, a third unwinding device 1300, a first cutting device 1400, a pressing roller device 1500, a second cutting device 1600, a stacking device 1700, a pressing device 1800 and a shelling device 1900.

[0197] The first unwinding device 1100 is configured to provide positive electrode strip material. The second unwinding mechanism is configured to provide negative electrode strip material. The third unwinding mechanism is configured to provide an isolating film strip material, and the isolating film strip material includes the isolating film 122 illustrated in any of the above embodiments and the electrolyte layer 123 provided on the isolating film 122. Exemplarily, the first unwinding device 1100 may include components such as an unwinding shaft and a driving motor. The unwinding shaft can be used to carry a roll of positive electrode strip material. The driving motor can provide rotational power to the unwinding shaft so that it can rotate and release the positive electrode strip material. The second unwinding device 1200 and the third unwinding device 1300 can be understood with reference to the first unwinding mechanism, and will not be described in detail here.

[0198] The first cutting device 1400 includes two cutting mechanisms, one of which is located downstream of the first unwinding device 1100 and upstream of the pressing roller device 1500, and the other cutting mechanism is located downstream of the second unwinding device 1200 and upstream of the pressing roller device 1500. The first cutting device 1400 is configured to cut the positive electrode strip and the negative electrode strip to form the positive electrode sheet 121a and the negative electrode sheet 121b. Exemplarily, the cutting mechanism can be cut by a tool or a laser beam. Further, the cutting mechanism can also include a positioning and measuring component to control the cutting size.

[0199] The pressing roller device 1500 is configured to composite the positive electrode sheet 121a and the negative electrode sheet 121b onto the isolation film 122 provided with the electrolyte layer 123 to form a composite member. Exemplarily, the pressing roller device 1500 may include two metal rollers with heating and pressurizing functions, and the metal rollers are coated with a stacked Teflon layer x1, a coating layer x2 and a release film layer x3, and the coating layer x2 is made of polyethylene particles. The Teflon layer x1 has certain anti-stickiness and chemical stability, which can improve the composite effect while protecting the metal roller. By providing the coating layer x2, the flexibility and wear resistance can be enhanced. By providing the release film layer x3, it is beneficial for the electrode sheet 121 and the isolation film 122 to be detached from the surface of the metal roller after hot pressing and composite.

[0200] The second cutting device 1600 is located downstream of the pressing roller device 1500, and the second cutting device 1600 is configured to cut the composite part. When the second cutting device 1600 performs the cutting action, it can cut according to the required number and length of the stacked sheets, and no specific limitation is made here. The implementation of the second cutting device 1600 can be understood with reference to the first cutting device 1400 illustrated above, and no specific limitation is made here.

[0201] The laminating device 1700 is located downstream of the second cutting device 1600. The laminating device 1700 can be a robotic arm or other automated laminating device that can perform laminating, and can fold the composite part according to the needs to form a laminated part. The laminating method of the laminating device 1700 can be a Z-shaped folding. Exemplarily, laminating rollers can be respectively set on both sides of the composite part, one of which is used to apply a force to the negative electrode sheet 121b on the composite part, and the other laminating roller is used to apply a force to the positive electrode sheet 121a on the composite part, and the two laminating rollers are alternately arranged to form a Z-shaped folding laminating process.

[0202] The pressing device 1800 is located downstream of the laminating device 1700. The pressing device 1800 can use a hydraulic, pneumatic or mechanical pressure device to apply a certain pressure to the electrode assembly 120 to be pressed after the lamination is completed. Exemplarily, the pressing device 1800 can be configured as an isostatic pressing device. Before the pressing device 1800 is pressed, the electrode assembly 120 to be pressed can be vacuumed. In the case of using the electrode assembly 120 illustrated in some of the above embodiments, in combination with the reference Figure 4 and Fig.11 , the second portion 1222 of the isolation film 122 can cover at least a portion of the edge region z2 of the main body 1211. During the pressing process, the edge region z2 of the main body 1211 is supported by the second portion 1222, thereby improving the situation where the pole piece 121 is crushed.

[0203] The shell loading device 1900 is located downstream of the pressing device 1800. The shell loading device 1900 is a device for loading the electrode assembly 120 into the accommodating cavity of the shell 110. Figure 3 , the shell loading device 1900 can preliminarily seal or fix the end cap 112 to the shell 111 after the electrode assembly 120 is loaded into the shell 111, and no specific limitation is made here. Exemplarily, the shell loading device 1900 may include a grasping mechanism, a positioning mechanism and a shell loading mechanism. The grasping mechanism can use a robotic arm or a vacuum suction cup to grasp the electrode assembly 120 from the processing station and transfer it to the position of the shell 110. The positioning mechanism can be used to determine the position of the housing cavity of the shell 110 and the electrode assembly 120. The shell loading mechanism can place the electrode assembly 120 into the housing cavity of the shell 110.

[0204] Thus, the battery cell 100 can be manufactured by the battery processing equipment 1000 illustrated above. In this process, by using the manufacturing method of the isolation film 122 and the battery cell 100 illustrated in some of the above embodiments, and using the battery processing equipment 1000 in combination, a continuous manufacturing process can be achieved, thereby improving the manufacturing efficiency. In addition, the advantages of the battery cell 100 manufactured by the manufacturing method of the battery cell 100 and the battery cell 100 manufactured by the battery processing equipment 1000 can refer to the contents illustrated in some of the above embodiments, and will not be repeated here.

[0205] It should be noted that when using Fig. 9 When the folding method shown in FIG. 1 is used, the electrode assembly 120 is disassembled to obtain the following Fig.10 The isolation film 122 is shown schematically. Of course, when an isolation film 122 of other structures is used, the isolation films 122 of different structures are disassembled. The specific disassembly method and the obtained structure are not specifically limited.

[0206] According to some embodiments of the present application, the present application provides a battery device 10, including the battery cell 100 in any of the above embodiments. The advantages possessed by the battery cell 100 in any of the above embodiments are also possessed by the battery device 10, which will not be described in detail here.

[0207] According to some embodiments of the present application, the present application provides an electric device, including the battery device 10 in any of the above embodiments. The advantages possessed by the battery device 10 in any of the above embodiments are also possessed by the electric device, which will not be described in detail here.

[0208] Finally, it should be noted that 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, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 claims and specification 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 claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises an electrode assembly (120); the electrode assembly (120) comprises: A plurality of pole pieces (121) are stacked along a first direction (F1); the pole piece (121) comprises a main body (1211) and a pole ear (1212) arranged on one side of the main body (1211); the main body (1211) has a central area (z1) and an edge area (z2) arranged around the central area (z1); and An isolation film (122) comprising a plurality of first portions (1221) and a second portion (1222) other than the first portions (1221), wherein the first portions (1221) are configured to be permeable to ions and the second portions (1222) are configured to block ions; The first part (1221) is provided on both sides of the main body (1211) along the first direction (F1), the second part (1222) covers at least part of the edge area (z2) of the main body (1211), and the tab (1212) extends out of the isolation membrane (122).

2. The battery cell according to claim 1, characterized in that: The second portion (1222) has a porous structure for blocking spacers.

3. The battery cell according to claim 2, characterized in that: The second portion (1222) includes closed pores (bk), and the maximum pore size of the closed pores (bk) is less than 100 nm.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The second portion (1222) is configured to be elastic.

5. The battery cell according to any one of claims 1 to 3, characterized in that: The second portion (1222) covers the entire edge area (z2) of the main body (1211).

6. The battery cell according to any one of claims 1 to 3, characterized in that: The orthographic projection of the central area (z1) of the main body (1211) on the reference plane (E) is located within the orthographic projection range of the first part (1221) corresponding to the main body (1211) on the reference plane (E); Among them, the first part (1221) corresponding to the main body (1211) is a first part (1221) arranged on both sides of the main body (1211) along the first direction (F1), and the reference plane (E) is a plane perpendicular to the first direction (F1).

7. The battery cell according to claim 6, characterized in that: The orthographic projection of the central area (z1) of the main body (1211) on the reference plane (E) and the orthographic projection of the first part (1221) corresponding to the main body (1211) on the reference plane (E) coincide with each other.

8. The battery cell according to claim 6, characterized in that: The outer contour of the orthographic projection of the main body (1211) on the reference surface (E) is arranged around the outer contour of the orthographic projection of the first part (1221) corresponding to the main body (1211) on the reference surface (E); The spacing between the outer contour of the orthographic projection of the main body (1211) on the reference surface (E) and the outer contour of the orthographic projection of the first part (1221) corresponding to the main body (1211) on the reference surface (E) is 0.3 mm to 2 mm.

9. The battery cell according to any one of claims 1 to 3, characterized in that: All the first parts (1221) and all the pole pieces (121) are alternately stacked along the first direction (F1).

10. The battery cell according to any one of claims 1 to 3, characterized in that: The first portion (1221) has a first side (c1) and a second side (c2) arranged opposite to each other along a second direction (F2); the second direction (F2) and the first direction (F1) intersect each other; Along the first direction (F1), the first sides (c1) of the first two adjacent first parts (1221) are connected by means of the second part (1222), and the second sides (c2) of the second two adjacent first parts (1221) are connected by means of the second part (1222).

11. The battery cell according to any one of claims 1 to 3, characterized in that: All of the first parts (1221) are independent of each other.

12. The battery cell according to claim 11, characterized in that: The second part (1222) includes a plurality of sub-parts (p), all of the sub-parts (p) and all of the first parts (1221) are arranged in one-to-one correspondence, and the sub-parts (p) are arranged around the outer periphery of the corresponding first part (1221); Along the first direction (F1), two adjacent sub-portions (p) are connected.

13. The battery cell according to claim 12, characterized in that: The sub-portion (p) has a third side (c3) and a fourth side (c4) arranged opposite to each other along a second direction (F2); the second direction (F2) and the first direction (F1) intersect each other; Along the first direction (F1), the third sides (c3) of the two preceding adjacent sub-portions (p) are connected, and the fourth sides (c4) of the two succeeding adjacent sub-portions (p) are connected.

14. The battery cell according to claim 12, characterized in that: The outer contour of the orthographic projection of the main body (1211) on the reference plane (E) is located within the orthographic projection range of the sub-portion (p) corresponding to the main body (1211) on the reference plane (E); The sub-portion (p) corresponding to the main body (1211) is a sub-portion (p) arranged around the first portion (1221) arranged on both sides of the main body (1211) along the first direction (F1); the reference plane (E) is a plane perpendicular to the first direction (F1).

15. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode assembly (120) further includes an electrolyte layer (123); Along the first direction (F1), the electrolyte layer (123) is located at least between two adjacent main body portions (1211).

16. The battery cell according to claim 15, characterized in that: The electrolyte layer (123) is provided on at least one side of the first portion (1221) along the first direction (F1); and / or Along the first direction (F1), at least one of the sides of at least two adjacent main body parts (1211) facing each other is provided with the electrolyte layer (123).

17. The battery cell according to any one of claims 1 to 3, characterized in that: The first portion (1221) has a porous structure capable of allowing ions to pass through.

18. The battery cell according to claim 17, characterized in that: The first portion (1221) includes a plurality of through holes (tk) penetrating along the first direction (F1).

19. The battery cell according to claim 18, characterized in that: The first part (1221) includes a plurality of partition walls (f), and all of the partition walls (f) are connected in a preset connection manner and define all of the through holes (tk).

20. The battery cell according to claim 19, characterized in that: Each of the through holes (tk) is surrounded and defined by four partition walls (f), and the same partition wall (f) is disposed between two adjacent through holes (tk).

21. The battery cell according to any one of claims 1 to 3, characterized in that: The first part (1221) and the second part (1222) are an integrally formed structure.

22. The battery cell according to any one of claims 1 to 3, characterized in that: The material of the first part (1221) includes one or more of polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene copolymer, polyacrylonitrile, and polymethyl methacrylate; and / or The material of the second part (1222) includes one or more of polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene copolymer, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene copolymer, polyacrylonitrile, and polymethyl methacrylate.

23. A battery device, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 22.

24. An electrical equipment, characterized in that: Comprising a battery device as claimed in claim 23.

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