Battery cell, processing method for battery cell, battery device and electric device

Abstract

The present application is applicable to the technical field of batteries. Provided are a battery cell (10), a processing method for the battery cell (10), a battery device (100) and an electric device. The battery cell (10) comprises an electrode assembly (1), wherein the electrode assembly (1) comprises an insulating member (12) and M electrode modules (E), each electrode module (E) comprising a plurality of electrode sheets (11); all the electrode sheets (11) in the M electrode modules (E) are stacked in a first direction (Y), the first direction (Y) being parallel to the direction (b) of thickness of the electrode sheets (11); in each electrode module (E), all electrode sheets (11) comprise a first electrode sheet (11a), a second electrode sheet (11b) and N electrode sheet units (F); each electrode sheet unit (F) comprises at least one electrode sheet (11), and the first electrode sheet (11a), the N electrode sheet units (F) and the second electrode sheet (11b) are sequentially stacked and are conductively connected in series; M≥1, N≥1, and both M and N are positive integers; and in the first direction (Y), at least part of the insulating member (12) is arranged on at least one side of the electrode modules (E) and is configured to connect the M electrode modules (E) in parallel. In this way, during processing of the battery cell (10), the capacity and voltage of the battery cell (10) can be regulated by means of adjusting the values of M and N.

Description

Battery cells, battery cell processing methods, battery devices, and electrical devices.

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202411911211.0, filed on December 24, 2024, with the State Intellectual Property Office of the People's Republic of China, entitled "Battery cell, method of processing battery cell, battery device and power supply device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to a battery cell, a method for processing the battery cell, a battery device, and an electrical device. Background Technology

[0004] In related technologies, a battery cell includes a casing and an electrode assembly disposed within the casing, the electrode assembly including electrode plates.

[0005] In some cases, the capacity of a battery cell can be controlled by adjusting the size of the electrode and the number of electrode stacking layers during the manufacturing process.

[0006] However, during the processing of individual battery cells, it is difficult to control the voltage of the individual cells.

[0007] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0008] In view of the above problems, the purpose of this application is to provide a battery cell, a method for processing the battery cell, a battery device, and an electrical device, so that the battery cell can achieve voltage regulation.

[0009] The technical solution adopted in the embodiments of this application is:

[0010] In a first aspect, embodiments of this application provide a battery cell, including an electrode assembly. The electrode assembly includes an insulating member and M electrode modules. Each electrode module includes multiple electrode sheets. All electrode sheets in the M electrode modules are stacked along a first direction, which is parallel to the thickness direction of the electrode sheets. In each electrode module, all electrode sheets include a first electrode sheet, a second electrode sheet, and N electrode sheet units. Each electrode sheet unit includes at least one electrode sheet, and the first electrode sheet, the N electrode sheet units, and the second electrode sheet are stacked sequentially and connected in series.

[0011] Where M≥1, N≥1, and M and N are both positive integers;

[0012] In the first direction, at least a portion of the insulating member is disposed on at least one side of the electrode module and is used to connect the M electrode modules in parallel.

[0013] The battery cell provided in this application embodiment comprises multiple electrode sheets stacked along a first direction to form M electrode modules. At least a portion of an insulating member is disposed on at least one side of each electrode module, enabling the M electrode modules to be connected in parallel. This allows the internal circuits of the M electrode modules to be connected in parallel when the value of M is ≥ 2. Thus, during the battery cell manufacturing process, the capacity of the battery cell can be controlled by adjusting the number of electrode modules in the M parallel electrode modules, i.e., adjusting the value of M. In each electrode module, all electrode sheets include a first electrode sheet, a second electrode sheet, and N electrode sheet units. The first electrode sheet, the N electrode sheet units, and the second electrode sheet are stacked along the first direction and connected in series, enabling the internal circuits of the electrode module to be connected in series. Thus, during the battery cell manufacturing process, the voltage of the battery cell can be controlled by adjusting the number of electrode sheet units in the electrode module that can be connected in series, i.e., adjusting the value of N. With this configuration, the capacity and voltage of the battery cell can be controlled by adjusting the values ​​of M and N during the battery cell manufacturing process.

[0014] In some embodiments, the first electrode includes a first current collector and a first film layer, and the second electrode includes a second current collector and a second film layer; in a first direction, the first film layer is disposed on the side of the first current collector facing the electrode unit, the second film layer is disposed on the side of the second current collector facing the electrode unit, a third film layer is formed on the side of the electrode unit facing the first film layer, and a fourth film layer is formed on the side of the electrode unit facing the second film layer.

[0015] The polarity of the third film layer is opposite to that of the fourth film layer, the polarity of the first film layer is opposite to that of the third film layer, and the polarity of the fourth film layer is opposite to that of the second film layer; in the first direction, the first film layer and the adjacent third film layer are configured to be ion-conducting, and the second film layer and the adjacent fourth film layer are configured to be ion-conducting.

[0016] By adopting the above technical solution, the first electrode and its adjacent electrode units can be electrically connected, and the second electrode and its adjacent electrode units can also be electrically connected. This facilitates the sequential series connection of the first electrode, N electrode units, and the second electrode, thereby achieving series connection of the internal circuit of the electrode module. Thus, by adjusting the value of N, the voltage of a single battery cell can be regulated, facilitating voltage control of the battery cells.

[0017] In some embodiments, M≥2; in a first direction, two adjacent electrode modules are respectively a first electrode module and a second electrode module, the second current collector of the first electrode module is closer to the second electrode module than the first current collector of the first electrode module, and at least a portion of the insulating member is disposed between the second current collector of the first electrode module and the first current collector of the second electrode module, so that the M electrode modules are connected in parallel.

[0018] By adopting the above technical solution, when the value of M is ≥2, the internal circuits of the M electrode modules can be connected in parallel, that is, the internal circuits of the battery cells can be connected in parallel. Thus, during the processing of the battery cells, the capacity of the battery cells can be controlled by adjusting the value of M, which facilitates the capacity control of the battery cells.

[0019] In some embodiments, N≥2; in the first direction, two adjacent electrode units are respectively a first electrode unit and a second electrode unit, the first electrode unit is disposed between the second electrode unit and the first electrode, and the fourth film layer of the first electrode unit and the third film layer of the second electrode unit are configured to be ion-conducting.

[0020] By adopting the above technical solution, when N≥2, the first electrode, N electrode units, and the second electrode can be sequentially connected in series, thereby achieving the series connection effect of the internal circuit of a single electrode module. With this configuration, the voltage of the battery cell can be easily controlled by adjusting the value of N during the battery cell manufacturing process.

[0021] In some embodiments, the first membrane layer includes a first active material layer, and the third membrane layer includes a third active material layer;

[0022] The first membrane layer further includes a first electrolyte layer, and a first active material layer is disposed between the first current collector and the first electrolyte layer; and / or, the third membrane layer further includes a third electrolyte layer, which is disposed on the side of the third active material layer facing the first current collector.

[0023] By adopting the above technical solution, the first electrode and the adjacent electrode unit can achieve electronic insulation, and the first film layer and the adjacent third film layer can achieve ion conduction, so that ions can be transported between the first film layer and the adjacent third film layer, thereby realizing the electrical connection between the first electrode and the adjacent electrode unit.

[0024] In some embodiments, the second membrane layer includes a second active material layer, and the fourth membrane layer includes a fourth active material layer;

[0025] The second membrane layer further includes a second electrolyte layer, and the second active material layer is disposed between the second current collector and the second electrolyte layer; and / or, the fourth membrane layer further includes a fourth electrolyte layer, which is disposed on the side of the fourth active material layer facing the second current collector.

[0026] By adopting the above technical solution, the second electrode and the adjacent electrode unit can achieve electronic insulation, and the second film layer and the adjacent fourth film layer can achieve ion conduction, so that ions can be transported between the second film layer and the adjacent fourth film layer, thereby realizing the electrical connection between the second electrode and the adjacent electrode unit.

[0027] In some embodiments, N≥2, the third membrane layer includes a third active material layer, and the fourth membrane layer includes a fourth active material layer;

[0028] The third membrane layer further includes a third electrolyte layer, which is disposed on the side of the third active material layer facing the first current collector; and / or, the fourth membrane layer further includes a fourth electrolyte layer, which is disposed on the side of the fourth active material layer facing the second current collector.

[0029] By adopting the above technical solution, two adjacent electrode units can achieve electronic insulation, and the film layers of two adjacent electrode units can achieve ion conduction. This allows ions to be transported between the film layers of two adjacent electrode units, thereby achieving electrical connection between two adjacent electrode units.

[0030] In some embodiments, on a projection plane perpendicular to the first direction, the projection of the first film layer extends beyond the outline of the projection of the third film layer; or, on a projection plane perpendicular to the first direction, the projection of the third film layer extends beyond the outline of the projection of the first film layer.

[0031] By adopting the above technical solution, on a projection plane perpendicular to the first direction, the projection of one of the first and third film layers extends beyond the outline of the projection of the other film layer, resulting in a dimensional difference between the first and second film layers. Thus, the space formed by the dimensional difference between the first and third film layers can be used to accommodate insulating structures such as insulating adhesive, which helps to improve the electronic insulation effect between the first electrode and adjacent electrode units.

[0032] In some embodiments, on a projection plane perpendicular to the first direction, the projection of the second film layer extends beyond the outline of the projection of the fourth film layer; or, on a projection plane perpendicular to the first direction, the projection of the fourth film layer extends beyond the outline of the projection of the second film layer.

[0033] By adopting the above technical solution, on the projection plane perpendicular to the first direction, the projection of one of the second and fourth film layers extends beyond the outline of the projection of the other film layer, resulting in a size difference between the second and fourth film layers. Thus, the space formed by the size difference between the second and fourth film layers can be used to accommodate insulating structures such as insulating adhesive, which helps to improve the electronic insulation effect between the second electrode and adjacent electrode units.

[0034] In some embodiments, N≥2;

[0035] On a projection plane perpendicular to the first direction, the projection of the third film layer extends beyond the outline of the projection of the fourth film layer; or, on a projection plane perpendicular to the first direction, the projection of the fourth film layer extends beyond the outline of the projection of the third film layer.

[0036] By adopting the above technical solution, on the projection plane perpendicular to the first direction, the projection of one of the third and fourth film layers extends beyond the outline of the projection of the other film layer, resulting in a size difference between the third and fourth film layers. Thus, the space formed by the size difference between the fourth film layer of the first electrode unit and the third film layer of the second electrode unit can be used to accommodate insulating structures such as insulating adhesive, thereby improving the electronic insulation effect between adjacent electrode units.

[0037] In some embodiments, the insulating member includes a plurality of insulating portions; in the conveying direction of the electrode assembly, a plurality of electrode plates and a plurality of insulating portions are spaced apart, and each electrode plate and each insulating portion is arranged alternately.

[0038] In the first direction, at least one side of the electrode module is provided with an insulating portion.

[0039] By adopting the above technical solution, multiple electrode sheets are spaced apart along the tape-carrying direction and connected to the insulating component at intervals along the tape-carrying direction. Thus, before the electrode sheets are stacked to form an electrode assembly, the insulating component connects the multiple electrode sheets together, allowing the insulating component and the multiple electrode sheets to be connected into a single structure. This enables the insulating component and the multiple electrode sheets to be stacked in a "Z" shape to form the electrode assembly. This allows the stacking of the insulating component and the stacking of the multiple electrode sheets to be continuous or alternating, facilitating the processing of the electrode assembly and helping to improve the processing efficiency of individual battery cells.

[0040] In some embodiments, the plurality of insulating portions include a first insulating portion; M≥2; in a first direction, the first insulating portion is disposed between two adjacent electrode modules.

[0041] By adopting the above technical solution, a second insulating part and a third insulating part can be formed on both sides of the electrode assembly along the first direction, so that the electrode assembly can achieve insulation protection effect on both sides of the first direction.

[0042] In some embodiments, the plurality of insulating portions include a second insulating portion and a third insulating portion; in a first direction, the second insulating portion and the third insulating portion are formed on both sides of the electrode assembly, respectively.

[0043] In some embodiments, the electrode unit includes a third electrode and a fourth electrode. The third electrode includes a third current collector and a third film layer, and the fourth electrode includes a fourth current collector and a fourth film layer. In a first direction, the third current collector and the fourth current collector are stacked and electrically connected. The third film layer is disposed on the side of the third current collector facing the first film layer, and the fourth film layer is disposed on the side of the fourth current collector facing the second film layer.

[0044] By establishing an electrical connection between the first and third electrodes, between the third and fourth electrodes, and between the fourth and second electrodes, it is possible to achieve sequential series connection of the first electrode, N electrode units, and the second electrode, thereby realizing the series connection of the internal circuit of the electrode module, which facilitates the voltage regulation of the battery cell.

[0045] In some embodiments, the insulating member includes a plurality of insulating portions; in the conveying direction of the electrode assembly, a plurality of electrode plates and a plurality of insulating portions are spaced apart, and each electrode plate and each insulating portion is arranged alternately.

[0046] In the first direction, at least one side of the electrode module is provided with an insulating portion;

[0047] The electrode includes a current collector, and the current collectors of the first electrode, the second electrode, the third electrode, and the fourth electrode are respectively the first current collector, the second current collector, the third current collector, and the fourth current collector;

[0048] When the electrode assembly is in the deployed state, the first film layer, the second film layer, the third film layer, and the fourth film layer are located on the same side of the current collector along the thickness direction of the electrode sheet.

[0049] By adopting the above technical solution, multiple electrode sheets can be connected together by the insulating component, allowing the insulating component and multiple electrode sheets to be stacked in a "Z" shape to form an electrode assembly. This facilitates the processing of the electrode assembly and helps improve the processing efficiency of individual battery cells. Furthermore, during the processing of individual battery cells, it is easier to adjust the values ​​of M and N, thereby facilitating the control of the capacity and voltage of the individual battery cells.

[0050] In some embodiments, in the carrying direction of the electrode assembly, the insulating portion disposed between the first current collector and the adjacent third current collector is a fourth insulating portion, the insulating portion disposed between the second current collector and the adjacent fourth current collector is a fifth insulating portion, and the insulating portion disposed between the third current collector and the fourth current collector is a sixth insulating portion.

[0051] The fourth and fifth insulating portions are located on one side of the current collector along the second direction, and the sixth insulating portion is located on the other side of the current collector along the second direction, with the second direction being perpendicular to the first direction.

[0052] By adopting the above technical solution, in the electrode assembly formed by stacking multiple electrodes, none of the fourth, fifth, and sixth insulating portions need to be stacked between the electrodes along the first direction. This simplifies the electrode assembly stacking process and eliminates the need for insulating components, thus contributing to increased energy density of the individual battery cells.

[0053] In some embodiments, N≥2; in the carrying direction of the electrode assembly, the insulating portion arranged between two adjacent electrode units is the seventh insulating portion;

[0054] In the second direction, the seventh insulating part is located on the side of the current collector away from the sixth insulating part.

[0055] This configuration facilitates the stacking of multiple electrodes to form an electrode module containing N electrode units, which helps improve the processing efficiency of individual battery cells.

[0056] In some embodiments, in the carrying direction of the electrode assembly, at least one insulating portion is connected to two adjacent current collectors at both ends;

[0057] And / or, the insulating element further includes a connecting portion between two adjacent insulating portions, and at least one current collector is disposed on the connecting portion.

[0058] This design makes the connection of the insulating components and multiple electrodes very flexible.

[0059] In some embodiments, the thickness of the current collector is greater than the thickness of the insulation portion.

[0060] This design can save on the use of insulating components, thereby improving the energy density of individual battery cells.

[0061] In some embodiments, the electrode further includes a film layer, wherein the film layer of the first electrode, the film layer of the second electrode, the film layer of the third electrode, and the film layer of the fourth electrode are respectively the first film layer, the second film layer, the third film layer, and the fourth film layer.

[0062] At least one current collector includes a first conductive layer and a second conductive layer electrically connected to the first conductive layer; in the thickness direction of the electrode, the first conductive layer and the second conductive layer are respectively disposed on both sides of the connection portion, and the film layer is disposed on the side of the first conductive layer away from the second conductive layer.

[0063] This design has two advantages. First, it facilitates the placement of the current collector on the connecting portion, thus improving the processing efficiency of the battery cell. Second, it allows the thickness of the current collector to be greater than the thickness of the connecting portion, thereby increasing the energy density of the battery cell.

[0064] In some embodiments, the polarity of the first current collector is opposite to that of the third current collector, the polarity of the second current collector is opposite to that of the fourth current collector, and the polarity of the third current collector is opposite to that of the fourth current collector.

[0065] By adopting the above technical solution, different materials can be selected to distinguish the polarity of different current collectors. This helps to solve the oxidation problem that occurs in the current collector during the electrochemical reaction, thereby helping to improve the cycle life of the electrode.

[0066] In some embodiments, the electrode module further includes a first electrode tab and a second electrode tab, wherein the first electrode tab is electrically connected to the first electrode plate and the second electrode tab is electrically connected to the second electrode plate.

[0067] By setting a first tab and a second tab, it is easy for the electrode assembly to achieve current transmission.

[0068] In some embodiments, the electrode module further includes a first electrode tab, and the first electrode tab and the first current collector are integrally formed;

[0069] And / or, the electrode module also includes a second tab, which is integrally formed with a second current collector.

[0070] This design simplifies the forming of the electrode sheets, thereby simplifying the processing of the battery cells and helping to improve the processing efficiency of the battery cells.

[0071] In some embodiments, M ≥ 2, and N has the same value in the M electrode modules.

[0072] By adopting the above technical solution, during the processing of battery cells, the voltage of the battery cells can be controlled by adjusting the value of N of each electrode module to be the same, which can ensure the stability of the voltage of the battery cells to a certain extent.

[0073] Secondly, embodiments of this application provide a method for processing a battery cell, applied to a battery cell; the method for processing a battery cell includes:

[0074] Multiple electrodes are stacked along a first direction to form M electrode modules, wherein the first electrode, N electrode units and the second electrode in the electrode module are stacked sequentially and connected in series.

[0075] At least a portion of the insulating element is disposed on at least one side of the electrode module along a first direction.

[0076] The battery cell processing method provided in this application embodiment enables the internal circuits of the electrode modules to be connected in series. Furthermore, when the value of M is ≥ 2, at least a portion of the insulating component can achieve insulation between the M electrode modules, allowing the internal circuits of the M electrode modules to be connected in parallel. With this configuration, during the battery cell processing, the capacity and voltage of the battery cell can be controlled by adjusting the values ​​of M and N.

[0077] In some embodiments, multiple electrodes are stacked along a first direction to form M electrode modules, wherein the first electrode, N electrode units, and the second electrode in each electrode module are stacked sequentially and connected in series, including:

[0078] The first electrode and the third electrode of the electrode unit are stacked along the first direction, so that the third film layer of the third electrode is disposed on the side of the third current collector of the third electrode facing the first film layer of the first electrode.

[0079] The third electrode and the fourth electrode of the electrode unit are stacked along the first direction so that the third current collector and the fourth current collector of the fourth electrode are stacked and electrically connected.

[0080] The fourth electrode and the second electrode are stacked so that the fourth film layer of the fourth electrode is located on the side of the fourth current collector facing the second film layer of the second electrode.

[0081] By adopting the above technical solution, the first film layer and the adjacent third film layer can achieve ion conduction, thereby enabling electrical connection between the first electrode and the third electrode of the adjacent electrode unit. The third and fourth current collectors of the electrode unit can be electrically connected, thereby enabling electrical connection between the third and fourth electrodes of the electrode unit. Furthermore, the second film layer and the adjacent fourth film layer can achieve ion conduction, thereby enabling electrical connection between the second electrode and the fourth electrode of the adjacent electrode unit. This arrangement facilitates the sequential series connection of the first electrode, N electrode units, and the second electrode in the electrode module, allowing voltage regulation of the battery cell to be achieved by adjusting the value of N during the battery cell manufacturing process.

[0082] In some embodiments, M ≥ 2; multiple electrodes are stacked along a first direction to form M electrode modules, wherein the first electrode, N electrode units, and the second electrode in the electrode module are stacked sequentially and connected in series, and the assembly further includes:

[0083] M electrode modules are stacked along the first direction;

[0084] Distributing at least a portion of the insulating element on at least one side of the electrode module along a first direction includes:

[0085] At least a portion of the insulating element is disposed between two adjacent electrode modules.

[0086] By adopting the above technical solution, the electrode sheets can be stacked along the first direction to form M electrode modules. By adjusting the value of M, the capacity of the battery cell can be controlled.

[0087] In some embodiments, N≥2; the third electrode and the fourth electrode of the electrode unit are stacked along a first direction, such that the third current collector and the fourth current collector of the fourth electrode are stacked and electrically connected, and then the fourth electrode and the second electrode are stacked, such that the fourth film layer of the fourth electrode is disposed before the side of the fourth current collector facing the second film layer of the second electrode, including:

[0088] N electrode units are stacked along the first direction.

[0089] By adopting the above technical solution, when multiple electrode sheets are stacked along the first direction, multiple electrode sheet units can be stacked in each electrode module, thus enabling voltage regulation of the battery cell.

[0090] In some embodiments, multiple electrodes are stacked along a first direction to form M electrode modules. Before the first electrode, N electrode units, and the second electrode in the electrode module are sequentially stacked and connected in series, the following steps are included:

[0091] Multiple current collectors of electrodes are spaced apart on an insulating member along the conveying direction of the electrode assembly, so that each current collector and each insulating part of the insulating member are alternately arranged in the conveying direction of the electrode assembly, and the first film layer, the second film layer, the third film layer and the fourth film layer are located on the same side of the current collector along the thickness direction of the electrode.

[0092] This configuration allows the stacking of insulating components and multiple electrode sheets to be carried out continuously or alternately, which simplifies the processing of electrode assemblies formed by stacking insulating components and multiple electrode sheets, thereby improving the processing efficiency of individual battery cells.

[0093] Thirdly, embodiments of this application provide a battery device, including a single battery cell.

[0094] The battery device provided in this application embodiment, by employing the aforementioned battery cells, can achieve capacity and voltage regulation at the battery cell level. This reduces the need for corresponding series and parallel connections of multiple battery cells, simplifies the electrical connection of the external circuit of the battery cells, and reduces the use of current collectors in the battery device, thereby helping to improve the energy density of the battery device.

[0095] Fourthly, embodiments of this application provide an electrical device, including a single battery cell or a battery device.

[0096] The electrical device provided in this application, by employing the aforementioned battery cells or battery devices, helps to improve the energy density of the electrical device.

[0097] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0098] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0099] Figure 1 is a schematic diagram of a vehicle provided in some embodiments of this application;

[0100] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0101] Figure 3 is a three-dimensional structural diagram of a battery cell provided in some embodiments of this application;

[0102] Figure 4 is a front view of the electrode assembly of a battery cell provided in some embodiments of this application;

[0103] Figure 5 is a top view of the electrode assembly shown in Figure 4;

[0104] Figure 6 is a left view of the electrode assembly shown in Figure 4;

[0105] Figure 7 is a front view of the electrode assembly shown in Figure 4 in its unfolded state;

[0106] Figure 8 is a top view of the electrode assembly shown in Figure 7;

[0107] Figure 9 is a magnified view of a portion of Figure 7;

[0108] Figure 10 is a front view of the electrode sheet of a battery cell provided in some embodiments of this application;

[0109] Figure 11 is a front view of the electrode assembly of a battery cell provided in some other embodiments of this application;

[0110] Figure 12 is a front view of the electrode assembly shown in Figure 11 in its unfolded state;

[0111] Figure 13 is a front view of the electrode assembly of a battery cell provided in some embodiments of this application;

[0112] Figure 14 is a front view of the electrode assembly shown in Figure 13 in its unfolded state;

[0113] Figure 15 is a partial cross-sectional view of the electrode and insulating components of a battery cell provided in some embodiments of this application;

[0114] Figure 16 is a flowchart of a battery cell processing method provided in some embodiments of this application;

[0115] Figure 17 is a flowchart of a battery cell processing method provided in some other embodiments of this application;

[0116] Figure 18 is a flowchart of a battery cell processing method provided in some embodiments of this application;

[0117] Figure 19 is a flowchart of a battery cell processing method provided in some embodiments of this application;

[0118] Figure 20 is a flowchart of a battery cell processing method provided in some embodiments of this application.

[0119] In the figures, the following labels are used: 1000-Vehicle; 100-Battery device; 200-Controller; 300-Motor; 10-Battery cell; 1-Electrode assembly; 11-Electrode; 11a-First electrode; 11b-Second electrode; 11c-Third electrode; 11d-Fourth electrode; 111-Current collector; 111a-First current collector; 111b-Second current collector; 111c-Third current collector; 111d-Fourth current collector; 1111-First conductive layer; 1112-Second conductive layer; 112-Film layer; 112a-First film layer; 1121a-First active material layer; 112b-Second film layer; 1121b-Second active material layer; 1122b-Second electrolyte layer; 112c-Third film layer; 1121c-Third active material layer; 1122c-Third electrolyte layer; 112d- Fourth film layer; 1121d-Fourth active material layer; 12-Insulator; 121-Insulating part; 121a-First insulating part; 121b-Second insulating part; 121c-Third insulating part; 121d-Fourth insulating part; 121e-Fifth insulating part; 121f-Sixth insulating part; 121g-Seventh insulating part; 122-Connecting part; 13a-First electrode tab; 13b-Second electrode tab; 2-Outer shell; 21-Shell; 22-End cap; 20-Box body; 210-First part; 220-Second part; E-Electrode module; E1-First electrode module; E2-Second electrode module; F-Electrode unit; F1-First electrode unit; F2-Second electrode unit; Y-First direction; X-Second direction; a-Traffic direction; b-Thickness direction; c-Width direction; d-Length direction. Detailed Implementation

[0120] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0121] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0122] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions.

[0123] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0124] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0125] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0126] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0127] In the description of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0128] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "proximity" and "adjacent" refer to proximity in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, meaning A2 is adjacent to B. Alternatively, B can be said to be adjacent to A2; in other words, A2 is adjacent to B. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2; in other words, C2 is adjacent to B.

[0129] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0130] In related technologies, a single battery cell includes a casing and an electrode assembly disposed within the casing. The electrode assembly includes electrodes and a separator. For stacked electrode assemblies, the electrodes and separators are generally stacked alternately along the thickness direction of the electrodes.

[0131] In some cases, the capacity of a battery cell can be controlled by adjusting the size of the electrode and the number of electrode stacking layers during the manufacturing process.

[0132] However, during the manufacturing process of individual battery cells, it is difficult to control their voltage, thus failing to meet usage requirements. Therefore, to ensure that a battery device composed of multiple battery cells has a predetermined capacity and voltage to meet usage needs, current collectors are generally used to connect the multiple battery cells in series and parallel. The electrical connections between multiple battery cells are complex, inevitably leading to a large number of current collectors. This results in current collectors occupying a significant amount of space in the battery device, thus affecting the energy density of the battery.

[0133] Based on the above considerations, embodiments of this application provide a battery cell, a method for processing a battery cell, a battery device, and an electrical device. Multiple electrode sheets are stacked along a first direction to form M electrode modules. At least a portion of an insulating member is disposed on at least one side of each electrode module and is used to connect the M electrode modules in parallel, such that when the value of M is ≥ 2, the internal circuits of the M electrode modules can be connected in parallel. Thus, during the processing of the battery cell, the capacity of the battery cell can be controlled by adjusting the number of electrode modules in the M electrode modules that can be connected in parallel, i.e., adjusting the value of M. In each electrode module, all electrode sheets include a first electrode sheet, a second electrode sheet, and N electrode sheet units. The first electrode sheet, the N electrode sheet units, and the second electrode sheet are stacked along the first direction and connected in series, enabling the internal circuits of the electrode module to be connected in series. Thus, during the processing of the battery cell, the voltage of the battery cell can be controlled by adjusting the number of electrode sheet units in the electrode module that can be connected in series, i.e., adjusting the value of N. With this setup, the capacity and voltage of a battery cell can be controlled by adjusting the values ​​of M and N during the cell manufacturing process.

[0134] The battery cell involved in the embodiments of this application refers to the smallest unit used for storing and outputting electrical energy. The battery cell can be a secondary battery or a primary battery. A secondary battery is a battery cell that can be recharged after discharge to activate the active materials and continue to be used.

[0135] The battery cells can be cylindrical, flat, cuboid, or other shapes. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0136] The battery device involved in the embodiments of this application can be a single physical module comprising one or more battery cells, used to provide voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection via a busbar. A mixed connection refers to multiple battery cells being connected in both series and parallel configurations.

[0137] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, multiple battery cells can be fixed to form a battery module by cable ties or the like. As an example, multiple battery cells can also be fixed to form a battery module by end plates, side plates, or the like.

[0138] In some embodiments, the battery device can be a battery pack, which may include a housing and individual battery cells. As an example, individual battery cells may be directly housed within the housing. Alternatively, multiple individual battery cells may be first assembled into one or more battery modules and then housed within the housing.

[0139] The battery cells and battery devices involved in the embodiments of this application can be used in energy storage devices that use battery cells or battery devices as energy storage elements.

[0140] The energy storage device can be an energy storage container or an energy storage cabinet. It can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device can store electrical energy as needed and output it when appropriate. For example, it can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0141] The battery cell and battery device provided in this application embodiment can also be used in electrical devices that use the battery cell or battery device as a power source.

[0142] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Based on the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Based on the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0143] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0144] In some embodiments, please refer to FIG1, which is a schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0145] In some embodiments, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0146] In some embodiments, please refer to FIG2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 20 and a battery cell 10. The housing 20 is a structure with internal space, and the internal space of the housing 20 is used to accommodate the battery cell 10.

[0147] The housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first part 210 and a second part 220, which overlap each other and jointly define the internal space of the housing 20, which is a closed space. Here, "closed" means covered or shut off; it can be sealed or unsealed. That is, the housing 20 can be a sealed structure or an unsealed structure. Referring to Figure 2, both the first part 210 and the second part 220 can be hollow structures with an opening at one end, with the open side of the first part 210 overlapping the open side of the second part 220, so that the first part 210 and the second part 220 jointly define the internal space of the housing 20. Alternatively, the first part 210 can be a hollow structure with an opening at one end, and the second part 220 can be a plate-like structure, with the second part 220 overlapping the open side of the first part 210, so that the first part 210 and the second part 220 jointly define the internal space of the housing 20. The box 20, which is composed of the first part 210 and the second part 220, can be of various shapes, such as cylinder, cuboid, etc.

[0148] In some embodiments, multiple battery cells 10 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 10 is directly housed in the internal space of the housing 20. In other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 20. In still other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 20.

[0149] In some embodiments, referring to Figures 1 and 2, the housing 20 of the battery device 100 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least a portion of the floor of the vehicle 1000, or a portion of the housing 20 can be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0150] In some embodiments, please refer to Figures 3 to 5 together with other accompanying drawings. Figure 3 is a perspective structural diagram of a battery cell 10 provided in some embodiments of this application; Figure 4 is a front view of the electrode assembly 1 of the battery cell 10 provided in some embodiments of this application; and Figure 5 is a top view of the electrode assembly 1 shown in Figure 4. The battery cell 10 provided in the embodiments of this application may include the electrode assembly 1 and the housing 2.

[0151] Electrode assembly 1 is the component in battery cell 10 where electrochemical reactions occur.

[0152] The housing 2 is used to define the internal environment of the battery cell 10 and to house the electrode assembly 1 and the electrolyte.

[0153] The electrolyte is used to conduct ions inside the electrode assembly 1. The electrolyte can be liquid, gel, or solid.

[0154] In some embodiments, please refer to Figures 3 to 5 together with other figures. The housing 2 may include a housing 21 and an end cap 22, which are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the housing 21 and the end cap 22 is used to accommodate the electrode assembly 1 and the electrolyte.

[0155] In some implementations, the housing 21 and the end cap 22 can be independent components. Specifically, the housing 21 has an opening, and the end cap 22 is placed over the opening of the housing 21 to jointly define the internal environment of the battery cell 10 and isolate the internal environment of the battery cell 10 from the external environment.

[0156] In other implementations, the housing 21 and end cap 22 can also be an integrated structure. Specifically, the end cap 22 and housing 21 can form a common connecting surface before the electrode assembly 1 is inserted into the housing. After the electrode assembly 1 is inserted into the housing, when it is necessary to encapsulate the electrode assembly 1, the end cap 22 is then used to close the housing 21. For example, when the battery cell 10 is a pouch battery, the housing 21 and end cap 22 of the battery cell 10 can be formed by punching a hole in the aluminum-plastic film. Then, the electrode assembly 1 is inserted into the internal environment formed by the punching hole in the aluminum-plastic film, and the opening of the aluminum-plastic film is fixed by sealing methods such as side sealing and top sealing. Of course, the battery cell 10 is not limited to a pouch battery, and the material of the housing 21 and end cap 22 is not limited to aluminum-plastic film.

[0157] The outer casing 2 can be either a sealed or unsealed structure. As an example, when the outer casing 2 is a sealed structure, it protects the electrode assembly 1 and, to some extent, prevents leakage such as electrolyte leakage. As an example, when the outer casing 2 is an unsealed structure, it still protects the electrode assembly 1, and a sealing bag may be included between the outer casing 2 and the electrode assembly 1 to encapsulate the electrode assembly 1 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum-plastic film, etc.

[0158] As shown in Figure 3, there can be one end cap 22, which is located at one end of the housing 21. Alternatively, there can be two end caps 22, which are located at opposite ends of the housing 21.

[0159] The housing 21 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly. The housing 21 and end cap 22 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0160] Please refer to Figures 4 through 14, and in conjunction with other accompanying drawings. Figure 4 is a front view of the electrode assembly 1 of a battery cell 10 according to some embodiments of this application, specifically a schematic diagram of the electrode assembly 1 viewed from the perspective of the length direction d of the electrode sheet 11. Figure 5 is a top view of the electrode assembly 1 shown in Figure 4, specifically a schematic diagram of the electrode assembly 1 viewed from the perspective of the thickness direction b of the electrode sheet 11. Figure 6 is a left view of the electrode assembly 1 shown in Figure 4, specifically a schematic diagram of the electrode assembly 1 viewed from the perspective of the width direction c of the electrode sheet 11. Figure 7 is a front view of the electrode assembly 1 shown in Figure 4 in its unfolded state, specifically a schematic diagram of the electrode assembly 1 in its unfolded state viewed from the perspective of the length direction d of the electrode sheet 11. Figure 8 is a top view of the electrode assembly 1 shown in Figure 7, specifically a schematic diagram of the electrode assembly 1 in its unfolded state viewed from the perspective of the thickness direction b of the electrode sheet 11. Figure 9 is a partially enlarged view of Figure 7. Figure 10 is a front view of the electrode 11 of the battery cell 10 provided in some embodiments of this application, specifically a schematic diagram of the electrode 11 from the perspective of its length direction d. Figure 11 is a front view of the electrode assembly 1 of the battery cell 10 provided in other embodiments of this application, specifically a schematic diagram of the electrode assembly 1 from the perspective of its length direction d. Figure 12 is a front view of the electrode assembly 1 provided in Figure 11 in its unfolded state, specifically a schematic diagram of the electrode assembly 1 from the perspective of its length direction d when it is in the unfolded state. Figure 13 is a front view of the electrode assembly 1 of the battery cell 10 provided in other embodiments of this application, specifically a schematic diagram of the electrode assembly 1 from the perspective of its length direction d when it is in the unfolded state. Figure 14 is a front view of the electrode assembly 1 provided in Figure 13 in its unfolded state, specifically a schematic diagram of the electrode assembly 1 from the perspective of its length direction d when it is in the unfolded state. In Figures 4, 9, 11, and 13, different components in the electrode assembly 1 are distinguished by different shades. The battery cell 10 provided in this application embodiment includes an electrode assembly 1, which includes an insulating member 12 and M electrode modules E. Each electrode module E includes multiple electrode sheets 11. All electrode sheets 11 in the M electrode modules E are stacked along a first direction Y, which is parallel to the thickness direction b of the electrode sheets 11. In each electrode module E, all electrode sheets 11 include a first electrode sheet 11a, a second electrode sheet 11b, and N electrode unit F. Each electrode unit F includes at least one electrode sheet 11, and the first electrode sheet 11a, the N electrode unit F, and the second electrode sheet 11b are stacked sequentially and connected in series. Wherein, M≥1, N≥1, and M and N are both positive integers. Wherein, at least a portion of the insulating member 12 is disposed on at least one side of the electrode module E in the first direction Y, and is used to connect the M electrode modules E in parallel.

[0161] Electrode assembly 1 is the component in the battery cell 10 where the electrochemical reaction occurs. Electrode assembly 1 is mainly formed by stacking multiple electrode sheets 11. The stacking of multiple electrode sheets 11 results in electrode assembly 1 having a stacked state, and electrode assembly 1 has a stacked structure. In the following embodiments, unless otherwise specifically defined, the state of electrode assembly 1 is generally considered to be in a stacked state.

[0162] Electrode 11 is the component in electrode assembly 1 where the electrochemical reaction occurs. It should be noted that electrode 11 may include a current collector 111 and a film layer 112 disposed on the current collector 111. The film layer 112 may include at least an active material layer. The current collector 111 is a conductive structure, which may be, but is not limited to, a metallic structure. The active material layer is a structural layer composed of active materials. The active material layer can be used for ion insertion or ion extraction. During the electrochemical reaction in electrode assembly 1, lithium ions can be transported between the active material layers of multiple electrodes 11 under the conduction of the electrolyte, thereby achieving the charging and discharging effect of the battery cell 10.

[0163] It should be noted that M refers to the number of electrode modules E, and the value of M can be 1, 2, 3, 4, 5, 6, 7, 8, etc. As an example, as shown in Figures 4, 7, and 8, the value of M is 2. As another example, as shown in Figures 11 to 14, the value of M is greater than 2.

[0164] N is the number of electrode units F in a single electrode module E. The value of N can be 1, 2, 3, 4, 5, 6, 7, 8, etc. As an example, as shown in Figures 4, 7 to 9, 11, and 12, the value of N is 1. As another example, as shown in Figures 13 and 14, the value of N is greater than 2.

[0165] All electrode plates 11 in M ​​electrode modules E are stacked along the first direction Y, meaning that multiple electrode plates 11 are stacked along the first direction Y to form M electrode modules E. It can be understood that the multiple electrode plates 11 can be divided into M parts, each part being an electrode module E, and when M ≥ 2, the M electrode modules E are stacked along the first direction Y.

[0166] Insulating component 12 refers to a component with insulating properties. Insulating component 12 has at least electronic insulating properties and may be, but is not limited to, a polyolefin membrane primarily composed of polyethylene (PE) or polypropylene (PP). Insulating component 12 may also have both electronic and ionic insulating properties.

[0167] In the first direction Y, at least a portion of the insulating member 12 is disposed on at least one side of the electrode module E and is used to connect M electrode modules E in parallel. This means that at least a portion of the insulating member 12 is disposed on at least one side of the electrode module E along the first direction Y, and when M≥2, the at least portion of the insulating member 12 being disposed on at least one side of the electrode module E along the first direction Y enables insulation between the M electrode modules E, thereby enabling the internal circuits of the M electrode modules E to be connected in parallel. As an example, as shown in Figures 4, 11, and 13, when M≥2, at least a portion of the insulating member 12 is disposed between two adjacent electrode modules E along the first direction Y to achieve insulation between the two adjacent electrode modules E, thus enabling the internal circuits of the two adjacent electrode modules E to be connected in parallel, thereby enabling the internal circuits of the M electrode modules E to be connected in parallel.

[0168] In electrode module E, all electrode pieces 11 include a first electrode piece 11a, a second electrode piece 11b, and N electrode units F. Each electrode unit F includes at least one electrode piece 11, meaning that among all the electrode pieces 11 in a single electrode module E, at least one electrode piece 11 is a first electrode piece 11a, at least one electrode piece 11 is a second electrode piece 11b, and electrode unit F is composed of at least one electrode piece 11. As an example, as shown in Figures 4, 7 to 9, and 11 to 14, in a single electrode module E, the number of first electrode pieces 11a and second electrode pieces 11b is one, and electrode unit F is composed of two electrode pieces 11.

[0169] The first electrode 11a, N electrode units F, and the second electrode 11b are stacked in sequence and connected in series. This means that in the first direction Y, the first electrode 11a and the second electrode 11b are distributed in sequence, and the electrode units F are stacked between the first electrode 11a and the second electrode 11b. Furthermore, when N is 1, as shown in Figures 4 and 11, in a single electrode module E, the first electrode 11a, electrode unit F, and second electrode 11b are stacked along the first direction Y and electrically connected in sequence, so that current can pass through the first electrode 11a, electrode unit F, and second electrode 11b in sequence, thereby making the internal circuit of the single electrode module E series-connected. When N is ≥2, as shown in Figure 13, N electrode units F are stacked between the first electrode 11a and second electrode 11b along the first direction Y. That is, in the first direction Y, all the electrodes 11 of the single electrode module E are stacked in the pattern of first electrode 11a, electrode unit F, electrode unit F... second electrode 11b, and the first electrode 11a, N electrode units F, and second electrode unit F2 are electrically connected in sequence, so that current can pass through the first electrode 11a, N electrode units F, and second electrode 11b in sequence, thereby making the internal circuit of the single electrode module E series-connected.

[0170] It should be further noted that the electrode 11 has length, width, and thickness. The length of the electrode 11 is greater than its thickness, and the width of the electrode 11 is greater than its thickness, so that the electrode 11 is a sheet material. The direction in which the length of the electrode 11 extends is the length direction d, simply referred to as the length direction d. The direction in which the width of the electrode 11 extends is the width direction c, simply referred to as the width direction c. The direction in which the thickness of the electrode 11 extends is the thickness direction b, simply referred to as the thickness direction b.

[0171] Here, the first direction Y refers to the stacking direction of the multiple electrode sheets 11 when the electrode assembly 1 is in a stacked state. The first direction Y is approximately parallel to the thickness direction b of each electrode sheet 11.

[0172] The battery cell 10 provided in this application embodiment comprises multiple electrode sheets 11 stacked along a first direction Y to form M electrode modules E. At least a portion of the insulating member 12 is disposed on at least one side of the electrode module E and is used to connect the M electrode modules E in parallel, such that when the value of M is ≥ 2, the internal circuits of the M electrode modules E can be connected in parallel, that is, the internal circuits of the battery cell 10 can be connected in parallel. Thus, during the processing of the battery cell 10, the capacity of the battery cell 10 can be controlled by adjusting the number of electrode modules E among the M electrode modules E that can be connected in parallel, that is, by adjusting the value of M. In the electrode module E, all electrode sheets 11 include a first electrode sheet 11a, a second electrode sheet 11b, and N electrode sheet units F, and the first electrode sheet 11a, the N electrode sheet units F, and the second electrode sheet 11b are stacked along the first direction Y and connected in series, so that the internal circuits of the electrode module E are connected in series. Thus, during the manufacturing process of the battery cell 10, the voltage of the battery cell 10 can be controlled by adjusting the number of electrode units F that can achieve series conduction in the electrode module E, i.e., by adjusting the value of N. With this configuration, the capacity and voltage of the battery cell 10 can be controlled by adjusting the values ​​of M and N during its manufacturing process. In other words, the battery cell 10 provided in this embodiment can achieve capacity and voltage control at the battery cell 10 level.

[0173] It should be further explained that by adjusting the values ​​of M and N, the capacity and voltage of the individual battery cells 10 can be controlled during processing. This facilitates the adjustment of the predetermined capacity and voltage of the battery device 100, which consists of multiple individual battery cells 10, to meet usage requirements. Therefore, the need for corresponding series and parallel connections of multiple battery cells 10 can be reduced, simplifying the electrical connections of the external circuits of the individual battery cells 10. This reduces the use of current collectors and thus helps to improve the energy density of the battery device 100.

[0174] In some embodiments, please refer to Figures 4, 9 to 11, and 13 together with other figures. The first electrode 11a includes a first current collector 111a and a first film layer 112a, and the second electrode 11b includes a second current collector 111b and a second film layer 112b. In the first direction Y, the first film layer 112a is disposed on the side of the first current collector 111a facing the electrode unit F. In the first direction Y, the second film layer 112b is disposed on the side of the second current collector 111b facing the electrode unit F. In the first direction Y, a third film layer 112c is formed on the side of the electrode unit F facing the first film layer 112a. In the first direction Y, a fourth film layer 112d is formed on the side of the electrode unit F facing the second film layer 112b. The polarity of the third film layer 112c is opposite to that of the fourth film layer 112d, the polarity of the first film layer 112a is opposite to that of the third film layer 112c, and the polarity of the fourth film layer 112d is opposite to that of the second film layer 112b. In the first direction Y, the first film layer 112a and the adjacent third film layer 112c are configured for ion conduction. In the first direction Y, the second film layer 112b and the adjacent fourth film layer 112d are configured for ion conduction.

[0175] Understandably, the current collector 111 of the first electrode 11a is the first current collector 111a, the film layer 112 of the first electrode 11a is the first film layer 112a, the current collector 111 of the second electrode 11b is the second current collector 111b, and the film layer 112 of the second electrode 11b is the second film layer 112b.

[0176] Understandably, the electrode unit F may include a carrier, the third film layer 112c, and the fourth film layer 112d. In the first direction Y, the third film layer 112c is disposed on the side of the carrier facing the first current collector 111a, and the fourth film layer 112d is disposed on the side of the carrier facing the second current collector 111b.

[0177] Understandably, the first membrane layer 112a, the second membrane layer 112b, the third membrane layer 112c, and the fourth membrane layer 112d may each include an active material layer.

[0178] In this design, the first membrane layer 112a can be positive, the second membrane layer 112b negative, the third membrane layer 112c negative, and the fourth membrane layer 112d positive; or, the first membrane layer 112a negative, the second membrane layer 112b positive, the third membrane layer 112c positive, and the fourth membrane layer 112d negative. The polarity of membrane layer 112 refers to the polarity of its active material layer.

[0179] In the first direction Y, the first film layer 112a and the adjacent third film layer 112c are configured to be ion-conducting. This means that when N is 1, as shown in Figures 4 and 11, the first film layer 112a and the third film layer 112c are configured to be ion-conducting, specifically, the active material layer of the first film layer 112a and the active material layer of the third film layer 112c are configured to be ion-conducting. When N is ≥2, as shown in Figure 13, the first film layer 112a and the third film layer 112c of the electrode unit F adjacent to the first direction Y are configured to be ion-conducting, specifically, the active material layer of the first film layer 112a and the active material layer of the third film layer 112c of the electrode unit F adjacent to the first direction Y are configured to be ion-conducting. Based on this, under the action of the electrolyte, ions can be transported between the first membrane layer 112a and the third membrane layer 112c adjacent along the first direction Y. Specifically, they can be transported between the active material layer of the first membrane layer 112a and the active material layer of the third membrane layer 112c adjacent along the first direction Y, thereby enabling the first electrode 11a and the electrode unit F adjacent along the first direction Y to be electrically connected.

[0180] In the first direction Y, the second film layer 112b and the adjacent fourth film layer 112d are configured to be ion-conducting. This means that when N is 1, as shown in Figures 4 and 11, the second film layer 112b and the fourth film layer 112d are configured to be ion-conducting, specifically, the active material layer of the second film layer 112b and the active material layer of the fourth film layer 112d are configured to be ion-conducting. When N is ≥2, as shown in Figure 13, the second film layer 112b and the fourth film layer 112d of the electrode unit F adjacent to the first direction Y are configured to be ion-conducting, specifically, the active material layer of the second film layer 112b and the active material layer of the fourth film layer 112d of the electrode unit F adjacent to the first direction Y are configured to be ion-conducting. Based on this, under the action of the electrolyte, ions can be transported between the second membrane layer 112b and the fourth membrane layer 112d adjacent along the first direction Y. Specifically, they can be transported between the active material layer of the second membrane layer 112b and the active material layer of the fourth membrane layer 112d adjacent along the first direction Y, thereby enabling the second electrode 11b and the electrode unit F adjacent along the first direction Y to be electrically connected.

[0181] By adopting the above technical solution, the first electrode 11a and its adjacent electrode unit F can be electrically connected, and the second electrode 11b and its adjacent electrode unit F can also be electrically connected. This facilitates the sequential series connection of the first electrode 11a, N electrode units F, and the second electrode 11b, thereby achieving series connection of the internal circuit of the electrode module E. Thus, by adjusting the value of N, the voltage of the battery cell 10 can be regulated, facilitating voltage regulation of the battery cell 10.

[0182] In some embodiments, please refer to Figures 4, 7 through 14, and other accompanying drawings. The electrode unit F includes a third electrode 11c and a fourth electrode 11d. The third electrode 11c includes a third current collector 111c and a third film layer 112c, and the fourth electrode 11d includes a fourth current collector 111d and a fourth film layer 112d. In the first direction Y, the third current collector 111c and the fourth current collector 111d are stacked and electrically connected. In the first direction Y, the third film layer 112c is disposed on the side of the third current collector 111c facing the first film layer 112a. In the first direction Y, the fourth film layer 112d is disposed on the side of the fourth current collector 111d facing the second film layer 112b.

[0183] Understandably, a single electrode unit F consists of two electrodes 11, namely a third electrode 11c and a fourth electrode 11d. The current collector 111 of the third electrode 11c is the third current collector 111c, and the film layer 112 of the third electrode 11c is the third film layer 112c. The current collector 111 of the fourth electrode 11d is the fourth current collector 111d, and the film layer 112 of the fourth electrode 11d is the fourth film layer 112d. The aforementioned carrier includes the third current collector 111c and the fourth current collector 111d.

[0184] Understandably, in the first direction Y, the third electrode 11c of electrode unit F is located between the fourth electrode 11d and the first electrode 11a of electrode unit F, and the fourth electrode 11d of electrode unit F is located between the third electrode 11c and the second electrode 11b of electrode unit F. When N is 1, as shown in Figures 4 and 11, in a single electrode module E, in the first direction Y, the first electrode 11a, the third electrode 11c, the fourth electrode 11d, and the second electrode 11b are stacked sequentially and connected in series, so that current can pass sequentially through the first electrode 11a, the third electrode 11c, the fourth electrode 11d, and the second electrode 11b. When N is ≥2, as shown in Figure 13, in the first direction Y, all the electrodes 11 of a single electrode module E are stacked in the order of first electrode 11a, third electrode 11c, fourth electrode 11d, third electrode 11c, fourth electrode 11d... second electrode 11b, and are connected in series so that the current can pass through the first electrode 11a, third electrode 11c, fourth electrode 11d, third electrode 11c, fourth electrode 11d... second electrode 11b in sequence.

[0185] In this configuration, at least electronic conductivity is achieved between the third current collector 111c and the fourth current collector 111d, so that the third current collector 111c and the fourth current collector 111d are electrically connected. As an example, as shown in Figure 4, electronic conductivity is achieved between the third current collector 111c and the fourth current collector 111d, so that the third electrode 11c and the fourth electrode 11d are electrically connected.

[0186] Specifically, the first electrode 11a is electrically connected to the adjacent electrode unit F, and specifically, the first electrode 11a is electrically connected to the third electrode 11c of the adjacent electrode unit F. The second electrode 11b is electrically connected to the adjacent electrode unit F, and specifically, the second electrode 11b is electrically connected to the fourth electrode 11d of the adjacent electrode unit F.

[0187] Electrical connections are established between the first electrode 11a and the third electrode 11c, between the third electrode 11c and the fourth electrode 11d, and between the fourth electrode 11d and the second electrode 11b. This facilitates the sequential series connection of the first electrode 11a, the N electrode units F, and the second electrode 11b, thereby enabling the series connection of the internal circuit of the electrode module E and facilitating voltage regulation of the battery cell 10.

[0188] In other embodiments, a single electrode unit F may be composed of one electrode 11. That is, a film layer 112 is formed on both sides of the electrode 11 along the thickness direction b, namely a third film layer 112c and a fourth film layer 112d.

[0189] In some embodiments, please refer to Figures 4, 7 to 9, and 11 to 14 together, and in conjunction with other figures. M ≥ 2. In the first direction Y, two adjacent electrode modules E are respectively the first electrode module E1 and the second electrode module E2. In the first direction Y, the second current collector 111b of the first electrode module E1 is closer to the second electrode module E2 than the first current collector 111a of the first electrode module E1. In the first direction Y, at least a portion of the insulating member 12 is disposed between the second current collector 111b of the first electrode module E1 and the first current collector 111a of the second electrode module E2, so that the M electrode modules E are connected in parallel.

[0190] Understandably, in the first direction Y, the first electrode module E1 and the second electrode module E2 are stacked sequentially along the direction from the first current collector 111a of the first electrode module E1 to the second current collector 111b of the first electrode module E1.

[0191] By having at least a portion of the insulating member 12 disposed on the second current collector 111b of the first electrode module E1 and the first current collector 111a of the second electrode module E2 in the first direction Y, insulation can be achieved between the second current collector 111b of the first electrode module E1 and the first current collector 111a of the second electrode module E2, thereby achieving insulation between the first electrode module E1 and the second electrode module E2, so that the internal circuits of the first electrode module E1 and the second electrode module E2 can be connected in parallel, that is, the internal circuits of two adjacent electrode modules E are connected in parallel.

[0192] When M is 2, as shown in Figure 4, the two electrode modules E are the first electrode module E1 and the second electrode module E2, respectively. The internal circuits of the first electrode module E1 and the second electrode module E2 can be connected in parallel.

[0193] When the value of M is greater than 2, as shown in Figures 11 and 13, in the first direction Y, any two adjacent electrode modules E are the first electrode module E1 and the second electrode module E2, respectively. An insulating element 12 can be provided between any two adjacent electrode modules E in the first direction Y, so that the internal circuits of any two adjacent electrode modules E can be connected in parallel, thereby enabling M electrode modules E to be connected in parallel.

[0194] Wherein, when the second current collector 111b of the first electrode module E1 does not have an active material layer on the side away from the second film layer 112b along the first direction Y, or when the first current collector 111a of the second electrode module E2 does not have an active material layer on the side away from the first film layer 112a along the first direction Y, as shown in Figures 2, 11 and 13, the insulating member 12 can be configured to have electronic insulation properties, or it can be configured to have both electronic insulation properties and ion conduction properties. When active material layers are provided on the side of the second current collector 111b of the first electrode module E1 away from the second film layer 112b along the first direction Y, and on the side of the first current collector 111a of the second electrode module E2 away from the first film layer 112a along the first direction Y, the portion of the insulating member 12 between the second current collector 111b of the first electrode module E1 and the first current collector 111a of the second electrode module E2 is configured to have electronic insulation properties and ionic insulation properties. This can truly achieve insulation between the first electrode module E1 and the second electrode module E2, so as to realize the parallel connection of the internal circuits of the first electrode module E1 and the second electrode module E2.

[0195] By adopting the above technical solution, when the value of M is ≥2, the internal circuits of the M electrode modules E can be connected in parallel, that is, the internal circuits of the battery cell 10 can be connected in parallel. Thus, during the processing of the battery cell 10, the capacity of the battery cell 10 can be controlled by adjusting the value of M, which facilitates the capacity control of the battery cell 10.

[0196] In some embodiments, please refer to Figures 13 and 14 together, and in conjunction with other figures. N≥2. In the first direction Y, two adjacent electrode units F are respectively a first electrode unit F1 and a second electrode unit F2. The first electrode unit F1 is disposed between the second electrode unit F2 and the first electrode 11a. The fourth film layer 112d of the first electrode unit F1 and the third film layer 112c of the second electrode unit F2 are configured for ion conduction.

[0197] Understandably, in the first direction Y, all the electrodes 11 of a single electrode module E are stacked in the order of first electrode 11a, first electrode unit F1, second electrode unit F2, first electrode unit F1... second electrode 11b, which makes the fourth electrode 11d of the first electrode unit F1 closer to the second electrode unit F2 than the third electrode 11c of the first electrode unit F1.

[0198] The fourth film layer 112d of the first electrode unit F1 and the third film layer 112c of the second electrode unit F2 are configured for ion conduction. Specifically, the active material layer of the fourth film layer 112d of the first electrode unit F1 and the active material layer of the third film layer 112c of the second electrode unit F2 are configured for ion conduction. Thus, under the action of the electrolyte, ions can be transported between the fourth film layer 112d of the first electrode unit F1 and the third film layer 112c of the second electrode unit F2, specifically between the active material layer of the fourth film layer 112d of the first electrode unit F1 and the active material layer of the third film layer 112c of the second electrode unit F2. This allows the first electrode unit F1 and the second electrode unit F2 to be electrically connected, that is, to achieve electrical connection between two adjacent electrode units F along the first direction Y.

[0199] When N is 2, the two electrode units F are the first electrode unit F1 and the second electrode unit F2, respectively. In a single electrode module E, the fourth film layer 112d of the first electrode unit F1 and the third film layer 112c of the second electrode unit F2 are ion-conducting, thus electrically connecting the first electrode unit F1 and the second electrode unit F2. The third film layer 112c of the first electrode unit F1 and the first film layer 112a of the first electrode 11a are ion-conducting, thus electrically connecting the first electrode unit F1 and the first electrode 11a. The fourth film layer 112d of the second electrode unit F2 and the second film layer 112b of the second electrode 11b are ion-conducting, thus electrically connecting the second electrode unit F2 and the second electrode 11b. Based on this, the first electrode 11a, the first electrode unit F1, the second electrode unit F2, and the second electrode 11b are connected in series and electrically connected.

[0200] When N is greater than 2, as shown in Figure 13, in the first direction Y, any two adjacent electrode units F are the first electrode unit F1 and the second electrode unit F2, respectively. In a single electrode module E, any two adjacent electrode units F can achieve ion conduction, so that N electrode units F are sequentially electrically connected. The first film layer 112a of the first electrode 11a is ion-conducted with the third film layer 112c of the adjacent electrode unit F, so that the first electrode 11a is electrically connected to the adjacent electrode unit F. The second film layer 112b of the second electrode 11b is ion-conducted with the fourth film layer 112d of the adjacent electrode unit F, so that the second electrode 11b is electrically connected to the adjacent electrode unit F. Based on this, the first electrode 11a, the N electrode units F, and the second electrode 11b are sequentially connected in series.

[0201] By adopting the above technical solution, when N≥2, the first electrode 11a, N electrode units F, and the second electrode 11b can be sequentially connected in series, thereby achieving the series connection effect of the internal circuit of a single electrode module E. With this configuration, the voltage regulation of the battery cell 10 can be conveniently achieved by adjusting the value of N during the processing of the battery cell 10.

[0202] It should be noted that at least one membrane layer 112 includes an electrolyte layer, which is a structural layer composed of an electrolyte. The electrolyte in this layer is a solid electrolyte, thus making the battery cell 10 a stationary battery. The electrolyte layer is configured to have electronic insulation properties and ion conduction properties.

[0203] In some embodiments, please refer to Figures 4, 9, 11, and 13 together, and in conjunction with other figures. The first membrane layer 112a includes a first active material layer 1121a, and the third membrane layer 112c includes a third active material layer 1121c.

[0204] Understandably, the active material layer of the first membrane layer 112a is the first active material layer 1121a, and the active material layer of the third membrane layer 112c is the third active material layer 1121c.

[0205] This configuration enables ion conduction between the first film layer 112a and the adjacent third film layer 112c, and enables electrical connection between the first electrode 11a and the adjacent electrode unit F.

[0206] In some possible designs, please refer to Figures 4, 9, 11, and 13 together with other figures. The third membrane layer 112c also includes a third electrolyte layer 1122c. In the first direction Y, the third electrolyte layer 1122c is disposed on the side of the third active material layer 1121c facing the first current collector 111a.

[0207] Understandably, the electrolyte layer of the third membrane layer 112c is the third electrolyte layer 1122c.

[0208] The third electrolyte layer 1122c can achieve electronic insulation between the first electrode 11a and the adjacent electrode unit F, and the third electrolyte can conduct ions between the first active material layer 1121a and the adjacent third active material layer 1121c.

[0209] In some possible designs, the first membrane layer 112a further includes a first electrolyte layer. In the first direction Y, the first active material layer 1121a is disposed between the first current collector 111a and the first electrolyte layer.

[0210] Understandably, the electrolyte layer of the first membrane layer 112a is the first electrolyte layer.

[0211] The first electrolyte layer can achieve electronic insulation between the first electrode 11a and the adjacent electrode unit F, and the first electrolyte can conduct ions between the first active material layer 1121a and the adjacent third active material layer 1121c.

[0212] By adopting the above technical solution, the first electrode 11a and the adjacent electrode unit F can achieve electronic insulation, and the first film layer 112a and the adjacent third film layer 112c can achieve ion conduction, so that ions can be transported between the first film layer 112a and the adjacent third film layer 112c, thereby realizing the electrical connection between the first electrode 11a and the adjacent electrode unit F.

[0213] In some embodiments, please refer to Figures 4, 9, 11, and 13 together with other figures. The second membrane layer 112b includes a second active material layer 1121b, and the fourth membrane layer 112d includes a fourth active material layer 1121d.

[0214] Understandably, the active material layer of the second membrane layer 112b is the second active material layer 1121b, and the active material layer of the fourth membrane layer 112d is the fourth active material layer 1121d.

[0215] This configuration enables ion conduction between the second film layer 112b and the adjacent fourth film layer 112d, and allows electrical connection between the second electrode 11b and the adjacent electrode unit F.

[0216] In some possible designs, please refer to Figures 4, 9, 11, and 13 together with other figures. The second membrane layer 112b also includes a second electrolyte layer 1122b. In the first direction Y, the second active material layer 1121b is disposed between the second current collector 111b and the second electrolyte layer 1122b.

[0217] Understandably, the electrolyte layer of the second membrane layer 112b is the second electrolyte layer 1122b.

[0218] The second electrolyte layer 1122b can achieve electronic insulation between the second electrode 11b and the adjacent electrode unit F, and the second electrolyte can conduct ions between the second active material layer 1121b and the adjacent fourth active material layer 1121d.

[0219] In some possible designs, the fourth membrane layer 112d also includes a fourth electrolyte layer. In the first direction Y, the fourth electrolyte layer is disposed on the side of the fourth active material layer 1121d facing the second current collector 111b.

[0220] Understandably, the electrolyte layer of the fourth membrane layer 112d is the fourth electrolyte layer.

[0221] The fourth electrolyte layer can achieve electronic insulation between the second electrode 11b and the adjacent electrode unit F, and the fourth electrolyte layer can conduct ions between the fourth active material layer 1121d and the adjacent fourth active material layer 1121d.

[0222] By adopting the above technical solution, the second electrode 11b and the adjacent electrode unit F can achieve electronic insulation, and the second film layer 112b and the adjacent fourth film layer 112d can achieve ion conduction, so that ions can be transported between the second film layer 112b and the adjacent fourth film layer 112d, thereby realizing the electrical connection between the second electrode 11b and the adjacent electrode unit F.

[0223] In some embodiments, please refer to Figures 13 and 14 together, and in conjunction with other figures. N≥2, the third membrane layer 112c includes the third active material layer 1121c, and the fourth membrane layer 112d includes the fourth active material layer 1121d.

[0224] Understandably, the active material layer of the third membrane layer 112c is the third active material layer 1121c, and the active material layer of the fourth membrane layer 112d is the fourth active material layer 1121d.

[0225] For ease of description, two adjacent electrode units F are defined as the first electrode unit F1 and the second electrode unit F2 mentioned above.

[0226] This configuration ensures that when N≥2, the fourth film layer 112d of the first electrode unit F1 and the third film layer 112c of the second electrode unit F2 can achieve ion conduction, enabling the first electrode unit F1 and the second electrode unit F2 to achieve electrical connection, thereby enabling the N electrode units in a single electrode module E to achieve electrical connection sequentially.

[0227] In some possible designs, please refer to Figures 13 and 14 together, and in conjunction with other figures. The third membrane layer 112c also includes a third electrolyte layer 1122c. In the first direction Y, the third electrolyte layer 1122c is disposed on the side of the third active material layer 1121c facing the first current collector 111a.

[0228] Understandably, the electrolyte layer of the third membrane layer 112c is the third electrolyte layer 1122c.

[0229] The third electrolyte layer 1122c provides electronic insulation between the first electrode unit F1 and the second electrode unit F2, thereby achieving electronic insulation between adjacent electrode units. The third electrolyte also conducts ions between the fourth active material layer 1121d of the first electrode unit F1 and the third active material layer 1121c of the second electrode unit F2, thus enabling ion conduction between the membrane layers 112 of adjacent electrode units.

[0230] In some possible designs, the fourth membrane layer 112d also includes a fourth electrolyte layer. In the first direction Y, the fourth electrolyte layer is disposed on the side of the fourth active material layer 1121d facing the second current collector 111b.

[0231] Understandably, the electrolyte layer of the fourth membrane layer 112d is the fourth electrolyte layer.

[0232] The fourth electrolyte layer provides electronic insulation between the first electrode unit F1 and the second electrode unit F2, thereby achieving electronic insulation between adjacent electrode units. The fourth electrolyte also conducts ions between the fourth active material layer 1121d of the first electrode unit F1 and the third active material layer 1121c of the second electrode unit F2, thus enabling ion conduction between the membrane layers 112 of adjacent electrode units.

[0233] By adopting the above technical solution, two adjacent electrode units F can achieve electronic insulation, and the film layers 112 of two adjacent electrode units F can achieve ion conduction, so that ions can be transported between the film layers 112 of two adjacent electrode units F, thereby realizing the electrical connection of two adjacent electrode units F.

[0234] Based on the above structure, it can be understood that at least one of the first membrane layer 112a and the third membrane layer 112c includes an electrolyte layer, and at least one of the second membrane layer 112b and the fourth membrane layer 112d includes an electrolyte layer. When N≥2, at least one of the third membrane layer 112c and the fourth membrane layer 112d includes an electrolyte layer.

[0235] In some embodiments, please refer to Figures 4, 11, and 13 together, and in conjunction with other figures. On a projection plane perpendicular to the first direction Y, the projection of the third film layer 112c extends beyond the outline of the projection of the first film layer 112a.

[0236] Specifically, as shown in Figures 4, 11, and 13, along the width direction c of the electrode 11, the third film layer 112c extends beyond both sides of the first film layer 112a. Furthermore, along the length direction d of the electrode 11, the third film layer 112c extends beyond both sides of the first film layer 112a.

[0237] Based on this, the surface area of ​​one side of the third film layer 112c along the thickness direction b is greater than the surface area of ​​one side of the first film layer 112a along the thickness direction b.

[0238] In other embodiments, on a projection plane perpendicular to the first direction Y, the projection of the first film layer 112a extends beyond the outline of the projection of the third film layer 112c.

[0239] Specifically, along the width direction c of the electrode 11, the first film layer 112a extends beyond both sides of the third film layer 112c. Furthermore, along the length direction d of the electrode 11, the first film layer 112a extends beyond both sides of the third film layer 112c.

[0240] Based on this, the surface area of ​​one side of the first film layer 112a along the thickness direction b is greater than the surface area of ​​one side of the third film layer 112c along the thickness direction b.

[0241] By adopting the above technical solution, on the projection plane perpendicular to the first direction Y, the projection of one of the first film layers 112a and the third film layer 112c extends beyond the outline of the projection of the other film layer 112, resulting in a size difference between the first film layer 112a and the second film layer 112b. Thus, the space formed by the size difference between the first film layer 112a and the third film layer 112c can be used to accommodate insulating structures such as insulating adhesive, which helps to improve the electronic insulation effect between the first electrode 11a and the adjacent electrode unit F.

[0242] In some embodiments, please refer to Figures 4, 11, and 13 together, and in conjunction with other figures. On a projection plane perpendicular to the first direction Y, the projection of the second film layer 112b extends beyond the outline of the projection of the fourth film layer 112d.

[0243] Specifically, as shown in Figures 4, 11, and 13, along the width direction c of the electrode 11, the second film layer 112b extends beyond both sides of the fourth film layer 112d. Furthermore, along the length direction d of the electrode 11, the second film layer 112b extends beyond both sides of the fourth film layer 112d.

[0244] Based on this, the surface area of ​​one side of the second film layer 112b along the thickness direction b is greater than the surface area of ​​one side of the fourth film layer 112d along the thickness direction b.

[0245] In other embodiments, on a projection plane perpendicular to the first direction Y, the projection of the fourth film layer 112d extends beyond the outline of the projection of the second film layer 112b.

[0246] Specifically, along the width direction c of the electrode 11, the fourth film layer 112d extends beyond both sides of the second film layer 112b. Furthermore, along the length direction d of the electrode 11, the fourth film layer 112d extends beyond both sides of the second film layer 112b.

[0247] Based on this, the surface area of ​​one side of the fourth film layer 112d along the thickness direction b is greater than the surface area of ​​one side of the second film layer 112b along the thickness direction b.

[0248] By adopting the above technical solution, on a projection plane perpendicular to the first direction Y, the projection of one of the second film layer 112b and the fourth film layer 112d extends beyond the outline of the projection of the other film layer 112, resulting in a dimensional difference between the second film layer 112b and the fourth film layer 112d. Thus, the space formed by the dimensional difference between the second film layer 112b and the fourth film layer 112d can be used to accommodate insulating structures such as insulating adhesive, which helps to improve the electronic insulation effect between the second electrode 11b and the adjacent electrode unit F.

[0249] In some embodiments, please refer to Figure 13, and in conjunction with other figures. N≥2.

[0250] For ease of description, two adjacent electrode units F are defined as the first electrode unit F1 and the second electrode unit F2 mentioned above.

[0251] In some possible designs, please refer to Figure 13, and in conjunction with other figures. On a projection plane perpendicular to the first direction Y, the projection of the third film layer 112c extends beyond the outline of the projection of the fourth film layer 112d.

[0252] Specifically, as shown in Figure 13, along the width direction c of the electrode 11, the third film layer 112c extends beyond both sides of the fourth film layer 112d. Furthermore, along the length direction d of the electrode 11, the third film layer 112c extends beyond both sides of the fourth film layer 112d.

[0253] Based on this, the surface area of ​​one side of the third film layer 112c along the thickness direction b is greater than the surface area of ​​one side of the fourth film layer 112d along the thickness direction b.

[0254] In some other possible designs, on a projection plane perpendicular to the first direction Y, the projection of the fourth film layer 112d extends beyond the outline of the projection of the third film layer 112c.

[0255] Specifically, along the width direction c of the electrode 11, the fourth film layer 112d extends beyond both sides of the third film layer 112c. Furthermore, along the length direction d of the electrode 11, the fourth film layer 112d extends beyond both sides of the third film layer 112c.

[0256] Based on this, the surface area of ​​one side of the fourth film layer 112d along the thickness direction b is greater than the surface area of ​​one side of the third film layer 112c along the thickness direction b.

[0257] By adopting the above technical solution, on the projection plane perpendicular to the first direction Y, the projection of one of the third film layer 112c and the fourth film layer 112d extends beyond the outline of the projection of the other film layer 112, resulting in a size difference between the third film layer 112c and the fourth film layer 112d. Thus, the space formed by the size difference between the fourth film layer 112d of the first electrode unit F1 and the third film layer 112c of the second electrode unit F2 can be used to accommodate insulating structures such as insulating adhesive, thereby improving the electronic insulation effect between two adjacent electrode units F.

[0258] In some embodiments, please refer to Figures 4, 7 to 9, and 11 to 14 together with other figures. The insulating member 12 includes a plurality of insulating portions 121. In the conveying direction a of the electrode assembly 1, a plurality of electrode pieces 11 and a plurality of insulating portions 121 are spaced apart, and the electrode pieces 11 and the insulating portions 121 are arranged alternately. In the first direction Y, at least one side of the electrode module E is provided with an insulating portion 121.

[0259] The insulating part 121 is a plurality of parts of the insulating member 12.

[0260] When electrode assembly 1 is in the unfolded state, as shown in Figures 7 to 9, 12 and 14, the conveying direction a of electrode assembly 1 is approximately parallel to the width direction c of electrode sheet 11. Here, the conveying direction a of electrode assembly 1 is simply referred to as the conveying direction a.

[0261] Specifically, as shown in Figures 7 to 9, 12, and 14, multiple electrode plates 11 are spaced apart along the tape-carrying direction a, and multiple insulating portions 121 are spaced apart along the tape-carrying direction a, with each electrode plate 11 and each insulating portion 121 arranged alternately. Understandably, in the tape-carrying direction a, the multiple electrode plates 11 and multiple insulating portions 121 are arranged sequentially in the pattern of insulating portion 121, electrode plate 11, insulating portion 121, electrode plate 11, insulating portion 121…

[0262] In this configuration, multiple electrode plates 11 are spaced apart along the tape-carrying direction a, specifically, the current collectors 111 of the multiple electrode plates 11 are spaced apart along the tape-carrying direction a. In the tape-carrying direction a of the electrode assembly 1, each electrode plate 11 and each insulating portion 121 are arranged alternately, specifically, in the tape-carrying direction a of the electrode assembly 1, the current collectors 111 of each electrode plate 11 and each insulating portion 121 are arranged alternately.

[0263] By adopting the above technical solution, multiple electrode sheets 11 are spaced apart along the tape-carrying direction a and connected to the insulating member 12 at intervals along the tape-carrying direction a. In this way, before the electrode sheets 11 are stacked to form the electrode assembly 1, the insulating member 12 connects the multiple electrode sheets 11 together, so that the insulating member 12 and the multiple electrode sheets 11 can be connected into a whole structure. This allows the insulating member 12 and the multiple electrode sheets 11 to be stacked in a "Z" shape to form the electrode assembly 1, so that the stacking of the insulating member 12 and the stacking of the multiple electrode sheets 11 can be carried out continuously or alternately, which facilitates the processing operation of the electrode assembly 1 and helps to improve the processing efficiency of the battery cell 10.

[0264] In some embodiments, please refer to Figures 4, 7 to 9, and 11 to 14 together with other figures. A plurality of insulating portions 121 include a first insulating portion 121a. M ≥ 2. In the first direction Y, the first insulating portion 121a is disposed between two adjacent electrode modules E.

[0265] At least one insulating part 121 is a first insulating part 121a.

[0266] When M ≥ 2, a first insulating portion 121a is provided between two adjacent electrode modules E in the first direction Y. This first insulating portion 121a provides insulation between two adjacent electrode modules E, allowing M electrode modules E to be connected in parallel. Thus, by adjusting the value of M, the capacity of the battery cell 10 can be controlled.

[0267] When M≥3, the electrode module E is provided with insulating parts 12 on both sides along the first direction Y.

[0268] In some embodiments, please refer to Figures 4, 7 to 9, and 11 to 14 together with other figures. The plurality of insulating portions 121 include a second insulating portion 121b and a third insulating portion 121c. In the first direction Y, the second insulating portion 121b and the third insulating portion 121c are formed on both sides of the electrode assembly 1, respectively.

[0269] Understandably, at least one insulating part 121 is a second insulating part 121b, and at least one insulating part 121 is a third insulating part 121c.

[0270] When M is 1, the second insulating part 121b and the third insulating part 121c are respectively disposed on both sides of the electrode module E along the first direction Y. Specifically, the second insulating part 121b is disposed on the side of the first current collector 111a away from the first film layer 112a along the first direction Y, and the third insulating part 121c is disposed on the side of the second current collector 111b away from the second film layer 112b along the first direction Y.

[0271] When M≥2, in the first direction Y, the second insulating part 121b is provided on the electrode module E at one end of the electrode assembly 1, and is provided on the side of the first current collector 111a of the electrode module E away from the first film layer 112a; the third insulating part 121c is provided on the electrode module E at the other end of the electrode assembly 1, and is provided on the side of the second current collector 111b of the electrode module E away from the second film layer 112b.

[0272] As shown in Figures 2, 11 and 13, the second insulating part 121b can cover the first current collector 111a, and the third insulating part 121c can cover the second current collector 111b.

[0273] By adopting the above technical solution, the electrode assembly 1 can be provided with a second insulating part 121b and a third insulating part 121c on both sides along the first direction Y, so that the electrode assembly 1 can achieve insulation protection effect on both sides along the first direction Y.

[0274] In some embodiments, please refer to Figures 4, 7 to 9, and 11 to 14 together, and in conjunction with other figures. In the conveying direction a of the electrode assembly 1, a plurality of electrode pieces 11 are spaced apart, and a plurality of insulating portions 121 are spaced apart, with each electrode piece 11 and each insulating portion 121 arranged alternately. In the first direction Y, at least one side of the electrode module E is provided with an insulating portion 121. Each electrode piece 11 includes a current collector 111; the current collector 111 of the first electrode piece 11a is the first current collector 111a, the current collector 111 of the second electrode piece 11b is the second current collector 111b, the current collector 111 of the third electrode piece 11c is the third current collector 111c, and the current collector 111 of the fourth electrode piece 11d is the fourth current collector 111d. The insulating member 12 includes a plurality of the aforementioned insulating portions 121. When the electrode assembly 1 is in the unfolded state, the first film layer 112a, the second film layer 112b, the third film layer 112c and the fourth film layer 112d are disposed on the same side of the current collector 111 along the thickness direction b of the electrode 11.

[0275] In the belt-carrying direction a of the electrode assembly 1, multiple electrode plates 11 are arranged at intervals, which means that in the belt-carrying direction a, in a single module, the first electrode plate 11a, N electrode plate units F, and the second electrode plate 11b are arranged at intervals. Specifically, when N is 1, in the belt-carrying direction a, the first electrode 11a, the third electrode 11c, the fourth electrode 11d, and the second electrode 11b in a single module are arranged alternately, specifically the first current collector 111a, the third current collector 111c, the fourth current collector 111d, and the second current collector 111b are arranged alternately. When N is ≥ 2, in the belt-carrying direction a, all electrodes 11 in a single module are arranged alternately in the pattern of first electrode 11a, third electrode 11c, fourth electrode 11d, third electrode 11c...fourth electrode 11d, second electrode 11b, specifically the first current collector 111a, third current collector 111c, fourth current collector 111d, third current collector 111c...fourth current collector 111d, second current collector 111b are arranged alternately. Furthermore, when M ≥ 2, in the belt-carrying direction a, the electrodes 11 of the M electrode modules E are arranged alternately.

[0276] When the electrode assembly 1 is in the unfolded state, as shown in Figures 7 to 9, 12 and 14, the first film layer 112a, the second film layer 112b, the third film layer 112c and the fourth film layer 112d are disposed on the same side of the current collector 111 along the thickness direction b of the electrode 11. Thus, in each electrode 11, the film layer 112 is disposed on one side of the current collector 111 along the thickness direction b, that is, each electrode 11 is configured with a single-sided film layer 112.

[0277] By adopting the above technical solution, the insulating component 12 can connect multiple electrode sheets 11 together, allowing the insulating component 12 and the multiple electrode sheets 11 to be stacked in a "Z" shape to obtain the electrode assembly 1. This facilitates the processing of the electrode assembly 1 and helps improve the processing efficiency of the battery cell 10. Furthermore, during the processing of the battery cell 10, it is easy to adjust the values ​​of M and N, thereby facilitating the regulation of the capacity and voltage of the battery cell 10.

[0278] In some embodiments, please refer to Figures 4, 7 to 9, and 11 to 14 together with other figures. In the carrying direction a of the electrode assembly 1, the insulating portion 121 disposed between the first current collector 111a and the adjacent third current collector 111c is a fourth insulating portion 121d, the insulating portion 121 disposed between the second current collector 111b and the adjacent fourth current collector 111d is a fifth insulating portion 121e, and the insulating portion 121 disposed between the third current collector 111c and the fourth current collector 111d is a sixth insulating portion 121f. When the electrode assembly 1 is in a stacked state, in the second direction X, the fourth insulating portion 121d and the fifth insulating portion 121e are disposed on one side of the current collector 111, and the sixth insulating portion 121f is disposed on the other side of the current collector 111. The second direction X and the first direction Y are substantially perpendicular.

[0279] The second direction X is a direction when the electrode assembly 1 is in a stacked state. The second direction X is approximately parallel to the width direction c of the electrode 11.

[0280] Understandably, at least one insulating part 121 is a fourth insulating part 121d, at least one insulating part 121 is a fifth insulating part 121e, and at least one insulating part 121 is a sixth insulating part 121f.

[0281] By adopting the above technical solution, in the electrode assembly 1 formed by stacking multiple electrode sheets 11, none of the fourth insulating portion 121d, the fifth insulating portion 121e, and the sixth insulating portion 121f need to be stacked between the electrode sheets 11 along the first direction Y. This simplifies the stacking operation of the electrode assembly 1. Furthermore, it eliminates the need for the insulating component 12, which helps to improve the energy density of the battery cell 10.

[0282] In some embodiments, please refer to Figures 13 and 14 together, and in conjunction with other figures. N≥2. In the carrying direction a of the electrode assembly 1, the insulating portion 121 disposed between two adjacent electrode units F is the seventh insulating portion 121g. When the electrode assembly 1 is in a stacked state, in the second direction X, the seventh insulating portion 121g is disposed on the side of the current collector 111 away from the sixth insulating portion 121f.

[0283] Understandably, at least one insulating part 121 is the seventh insulating part 121g.

[0284] Understandably, when the electrode assembly 1 is in a stacked state, in the second direction X, the fourth insulating part 121d, the fifth insulating part 121e and the seventh insulating part 121g are provided on one side of the current collector 111, and the sixth insulating part 121f is provided on the other side of the current collector 111.

[0285] This arrangement facilitates the stacking of multiple electrode sheets 11 to form an electrode module E containing N electrode units F, which helps improve the processing efficiency of the battery cell 10.

[0286] In the conveying direction a, the size of the first insulating part 121a can be greater than the sum of the sizes of the two pole pieces 11, specifically greater than the sum of the sizes of the first pole piece 11a and the second pole piece 11b.

[0287] In the conveying direction a, the size of the second insulating part 121b can be larger than the size of the electrode 11, specifically larger than the size of the first electrode 11a.

[0288] In the direction a of the conveying belt, the size of the third insulating part 121c can be larger than the size of the electrode 11, specifically larger than the size of the second electrode 11b.

[0289] The fourth insulating part 121d can have a dimension greater than the sum of the thicknesses of the two electrode plates 11 along the tape-carrying direction a, specifically greater than the sum of the thicknesses of the first electrode plate 11a and the third electrode plate 11c.

[0290] The fifth insulating part 121e can have a dimension greater than the sum of the thicknesses of the two electrode plates 11 along the tape-carrying direction a, specifically greater than the sum of the thicknesses of the second electrode plate 11b and the fourth electrode plate 11d.

[0291] Among them, the size of the sixth insulating part 121f along the tape-carrying direction a can be greater than the sum of the thicknesses of the current collectors 111 of the two electrode plates 11, specifically greater than the sum of the thicknesses of the third current collector 111c and the fourth current collector 111d.

[0292] Among them, the size of the seventh insulating part 121g along the conveying direction a can be greater than the sum of the thicknesses of the two electrode plates 11, specifically greater than the sum of the thicknesses of the third electrode plate 11c and the fourth electrode plate 11d.

[0293] In some embodiments, in the carrying direction a of the electrode assembly 1, at least one insulating portion 121 has two adjacent current collectors 111 connected to its two ends respectively.

[0294] The insulating part 121 and the current collector 111 can be connected by, but not limited to, adhesive bonding.

[0295] Therefore, the insulating member 12 is not a complete structure, but is composed of multiple dispersed insulating parts 121. During the processing of the battery cell 10, the insulating parts 121 can be connected between the current collectors 111 of the two electrodes 11, so that multiple electrodes 11 are connected together through multiple insulating parts 121.

[0296] In some embodiments, please refer to FIG15, and in conjunction with other figures. FIG15 is a partial cross-sectional view of the electrode 11 and the insulating member 12 of the battery cell 10 provided in some embodiments of this application. In FIG15, different components are distinguished by shading. The insulating member 12 also includes a connecting portion 122, which connects two adjacent insulating portions 121, and at least one current collector 111 is disposed on the connecting portion 122.

[0297] The connecting part 122 is part of the structure of the insulating part 12.

[0298] Specifically, in the conveying direction a, the connecting portion 122 is disposed between two adjacent insulating portions 121, and the two sides of the connecting portion 122 are respectively connected to the two adjacent insulating portions 121. It can be understood that in the conveying direction a, among the plurality of connecting portions 122 and the plurality of insulating portions 121, each insulating portion 121 and each connecting portion 122 are arranged alternately.

[0299] The connecting portion 122 and the insulating portion 121 may be connected by, but is not limited to, adhesive bonding. Alternatively, the connecting portion 122 and the insulating portion 121 may be integrally formed.

[0300] Based on this, the insulating element 12 is a continuous integral structure arranged in the conveying direction a, which simplifies the connection operation between the insulating element 12 and the multiple electrode plates 11.

[0301] This configuration makes the connection between the insulating element 12 and the multiple electrode plates 11 very flexible.

[0302] In some embodiments, please refer to FIG15, and in conjunction with other figures. The thickness of the current collector 111 is greater than the thickness of the insulating portion 121.

[0303] Based on this, the current collector 111 can extend beyond at least one side of the insulating portion 121 in the thickness direction b of the electrode 11. As an example, as shown in FIG15, the current collector 111 extends beyond both sides of the insulating portion 121 in the thickness direction b of the electrode 11.

[0304] This design saves on the use of insulating components 12, thereby improving the energy density of the battery cell 10.

[0305] In some embodiments, please refer to Figures 4, 7 to 15 together, and in conjunction with other figures. The electrode 11 further includes a film layer 112, wherein the film layer 112 of the first electrode 11a is a first film layer 112a, the film layer 112 of the second electrode 11b is a second film layer 112b, the film layer 112 of the third electrode 11c is a third film layer 112c, and the film layer 112 of the fourth electrode 11d is a fourth film layer 112d. At least one current collector 111 includes a first conductive layer 1111 and a second conductive layer 1112, the second conductive layer 1112 being electrically connected to the first conductive layer 1111. In the thickness direction b of the electrode 11, the first conductive layer 1111 and the second conductive layer 1112 are respectively disposed on both sides of the connecting portion 122, and the film layer 112 is disposed on the side of the first conductive layer 1111 away from the second conductive layer 1112.

[0306] Both the first conductive layer 1111 and the second conductive layer 1112 are components with conductive properties. The first conductive layer 1111 and the second conductive layer 1112 may be, but are not limited to, metallic structures. The materials of the first conductive layer 1111 and the second conductive layer 1112 may be the same or different.

[0307] This configuration serves two purposes. First, it facilitates the placement of the current collector 111 on the connecting portion 122, thereby improving the processing efficiency of the battery cell 10. Second, it allows the thickness of the current collector 111 to be greater than the thickness of the connecting portion 122, thus improving the energy density of the battery cell 10.

[0308] In some embodiments, the polarity of the first current collector 111a is opposite to that of the third current collector 111c, the polarity of the second current collector 111b is opposite to that of the fourth current collector 111d, and the polarity of the third current collector 111c is opposite to that of the fourth current collector 111d.

[0309] The first current collector 111a can be positive, the second current collector 111b can be negative, the third current collector 111c can be negative, and the fourth current collector 111d can be positive; or, the first current collector 111a can be negative, the second current collector 111b can be positive, the third current collector 111c can be positive, and the fourth current collector 111d can be negative.

[0310] As an example, the first current collector 111a and the fourth current collector 111d are both aluminum foil, while the second current collector 111b and the third current collector 111c are both copper foil.

[0311] By adopting the above technical solution, different materials can be selected to distinguish the polarity of different current collectors 111. This helps to solve the oxidation problem of current collector 111 during the electrochemical reaction, thereby helping to improve the cycle life of electrode 11.

[0312] The first electrode 11a and the fourth electrode 11d can be configured to have the same structure, and the second electrode 11b and the third electrode 11c can be configured to have the same structure, which facilitates the processing of the electrode assembly 1.

[0313] In other embodiments, the polarity of current collector 111 may not be distinguished; that is, the first current collector 111a, the second current collector 111b, the third current collector 111c, and the fourth current collector 111d may be made of the same material. As an example, the material of current collector 111 is silver.

[0314] In some embodiments, please refer to Figures 5, 6, and 8 together with other figures. The electrode module E also includes a first tab 13a and a second tab 13b, the first tab 13a being electrically connected to the first electrode 11a, and the second tab 13b being electrically connected to the second electrode 11b.

[0315] The first tab 13a and the second tab 13b are both conductive components, which may be, but are not limited to, metal structures.

[0316] In this configuration, the first tab 13a can be a positive tab, and therefore, the first film layer 112a is positive, and the first current collector 111a can also be positive. The second tab 13b is a negative tab, and therefore, the second film layer 112b is negative, and the second current collector 111b can also be negative. Alternatively, the first tab 13a can be a negative tab, and therefore, the first film layer 112a is negative, and the first current collector 111a can also be negative. The second tab 13b can be a positive tab, and therefore, the second film layer 112b is positive, and the second current collector 111b can also be positive.

[0317] In the electrode assembly 1, the first tab 13a and the second tab 13b can be disposed at one end of the electrode assembly 1 along the length direction d of the electrode 11, as shown in Figures 5, 6 and 8; the first tab 13a and the second tab 13b can also be disposed at both ends of the electrode assembly 1 along the length direction d of the electrode 11.

[0318] The first tab 13a is electrically connected to the first electrode 11a, specifically to the first current collector 111a of the first electrode 11a. The second tab 13b is electrically connected to the second electrode 11b, specifically to the second current collector 111b of the second electrode 11b.

[0319] By setting the first tab 13a and the second tab 13b, the electrode assembly 1 can facilitate current transmission.

[0320] The third electrode 11c may or may not be connected to the second electrode tab 13b. The fourth electrode 11d may or may not be connected to the first electrode tab 13a.

[0321] Understandably, when M≥2, each electrode module E is provided with a first tab 13a and a second tab 13b. In electrode assembly 1, the first tabs 13a of M electrode modules E can be connected together, and the second tabs 13b of M electrode modules E can also be connected together.

[0322] In some embodiments, please refer to Figures 5, 6, and 8 together with other figures. The electrode module E also includes a first tab 13a, which and a first current collector 111a are integrally formed.

[0323] As an example, the first tab 13a is made of aluminum foil.

[0324] In some embodiments, please refer to Figures 5, 6, and 8 together with other figures. The electrode module E also includes a second tab 13b, which is integrally formed with a second current collector 111b.

[0325] As an example, the second tab 13b is a copper foil.

[0326] This design simplifies the forming of the electrode 11, thereby simplifying the processing of the battery cell 10 and helping to improve the processing efficiency of the battery cell 10.

[0327] In other embodiments, the first tab 13a and the first current collector 111a may be electrically connected by, but not limited to, welding. The second tab 13b and the second current collector 111b may be electrically connected by, but not limited to, welding.

[0328] In some embodiments, please refer to Figures 4, 7 through 9, and other accompanying figures. M ≥ 2, and the value of N is the same in the M electrode modules E.

[0329] Understandably, in the M electrode modules E, any two electrode modules E have the same number of electrode units F. As an example, as shown in Figure 4, each electrode module E includes one electrode unit F.

[0330] By adopting the above technical solution, during the processing of the battery cell 10, the voltage of the battery cell 10 can be controlled by adjusting the value of N of each electrode module E to be the same, which can ensure the stability of the voltage of the battery cell 10 to a certain extent.

[0331] Please refer to Figure 16, and in conjunction with other accompanying drawings. Figure 16 is a flowchart illustrating a processing method for a battery cell 10 according to some embodiments of this application. The processing method for the battery cell 10 provided in this application is applied to the battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the above embodiments; please refer to the relevant descriptions of the battery cell 10 in the above embodiments for details, which will not be repeated here. The processing method for the battery cell 10 provided in this application includes the following steps:

[0332] S10. Multiple electrode sheets 11 are stacked along the first direction Y to form M electrode modules E, and the first electrode sheet 11a, N electrode units F and the second electrode sheet 11b in the electrode module E are stacked in sequence and connected in series.

[0333] S20. At least a portion of the insulating member 12 is disposed on at least one side of the electrode module E along the first direction Y.

[0334] Steps S10 and S20 can be performed sequentially or alternately.

[0335] For example, when M is 1: multiple electrode plates 11 can be stacked along the first direction Y first, and then at least a portion of the insulating member 12 can be disposed on at least one side of the electrode module E along the first direction Y; alternatively, the second insulating portion 121b of the insulating member 12 can be arranged along the first direction Y first, and then multiple electrode plates 11 can be stacked along the first direction Y on the second insulating portion 121b, and then the third insulating portion 121c of the insulating member 12 can be stacked along the first direction Y on the side of the electrode module E away from the second insulating portion 121b.

[0336] For example, when the value of M is ≥2, the second insulating portion 121b of the insulating member 12 can be arranged along the first direction Y firstly, and then the multiple electrode pieces 11 of the first electrode module E can be stacked on the second insulating portion 121b along the first layer. Then, the first first insulating portion 121a of the insulating member 12 can be stacked on the side of the first electrode module E away from the second insulating portion 121b. Then, the multiple electrode pieces 11 of the second electrode module E can be stacked on the first first insulating portion 121a along the first direction Y. Then, the second first insulating portion 121a can be stacked on the side of the second electrode module E away from the second insulating portion 121b. And so on, the multiple electrode pieces 11 of the last electrode module E can be stacked along the first direction Y on the side of the last first insulating portion 121a away from the second insulating portion 121b. Finally, the third insulating portion 121c can be stacked along the first direction Y on the side of the last electrode module E away from the second insulating portion 121b.

[0337] The battery cell 10 processing method provided in this application embodiment enables the internal circuits of the electrode modules E to be connected in series. Furthermore, when the value of M is ≥ 2, at least a portion of the insulating member 12 can achieve insulation between the M electrode modules E, thereby enabling the internal circuits of the M electrode modules E to be connected in parallel. With this configuration, during the processing of the battery cell 10, the capacity and voltage of the battery cell 10 can be controlled by adjusting the values ​​of M and N.

[0338] In some embodiments, please refer to FIG17, and in conjunction with other figures. FIG17 is a flowchart of a processing method for a battery cell 10 provided in other embodiments of this application. Step S10, which involves stacking multiple electrode sheets 11 along a first direction Y to form M electrode modules E, wherein the first electrode sheet 11a, N electrode units F, and the second electrode sheet 11b in the electrode module E are stacked sequentially and connected in series, includes the following steps:

[0339] S11. The first electrode 11a and the third electrode 11c of the electrode unit F are stacked along the first direction Y, so that the third film layer 112c of the third electrode 11c is disposed on the side of the third current collector 111c of the third electrode 11c facing the first film layer 112a of the first electrode 11a.

[0340] This step involves stacking the first electrode 11a and the third electrode 11c of the electrode unit F along the first direction Y.

[0341] S12. The third electrode 11c and the fourth electrode 11d of the electrode unit F are stacked along the first direction Y so that the third current collector 111c and the fourth current collector 111d of the fourth electrode 11d are stacked and electrically connected.

[0342] This step involves stacking the third electrode 11c and the fourth electrode 11d of the electrode unit F along the first direction Y.

[0343] S13. The fourth electrode 11d and the second electrode 11b are stacked so that the fourth film layer 112d of the fourth electrode 11d is disposed on the side of the fourth current collector 111d facing the second film layer 112b of the second electrode 11b.

[0344] This step involves stacking the second electrode 11b and the fourth electrode 11d of the electrode unit F along the first direction Y.

[0345] Steps S11, S12, and S13 can be performed sequentially or in reverse order.

[0346] Among them, steps S11, S12, and S13 can be the stacking steps of electrode module E when N is 1.

[0347] By adopting the above technical solution, the first film layer 112a and the adjacent third film layer 112c can achieve ion conduction, so that the first electrode 11a and the third electrode 11c of the adjacent electrode unit F can be electrically connected. The third current collector 111c and the fourth current collector 111d of the electrode unit F can be electrically connected, so that the third electrode 11c and the fourth electrode 11d of the electrode unit F can be electrically connected. Furthermore, the second film layer 112b and the adjacent fourth film layer 112d can achieve ion conduction, so that the second electrode 11b and the fourth electrode 11d of the adjacent electrode unit F can be electrically connected. This arrangement helps to connect the first electrode 11a, the N electrode units F, and the second electrode 11b in the electrode module E in series, so that the voltage of the battery cell 10 can be regulated by adjusting the value of N during the processing of the battery cell 10.

[0348] In some embodiments, please refer to FIG18, and in conjunction with other figures. FIG18 is a flowchart of a processing method for a battery cell 10 provided in some embodiments of this application. M≥2. Step S10, which involves stacking multiple electrode sheets 11 along the first direction Y to form M electrode modules E, wherein the first electrode sheet 11a, N electrode units F, and the second electrode sheet 11b in the electrode module E are stacked sequentially and connected in series, further includes the following steps:

[0349] S14. Stack the M electrode modules E along the first direction Y;

[0350] Specifically, this step can be a sequential repetition of steps S11, S12, and S13.

[0351] Step S20, which involves disposing at least a portion of the insulating member 12 on at least one side of the electrode module E along the first direction Y, includes the following steps:

[0352] S21. At least a portion of the insulating element 12 is disposed between two adjacent electrode modules E.

[0353] In this step, specifically, the first insulating part 121a of the insulating member 12 is disposed between two adjacent electrode modules E.

[0354] As an example, the processing flow of the battery cell 10 can be: step S11, step S12, step S13, step S21, step S14, step S21, step S14, step S21, step S14... step S14, and so on.

[0355] Specifically, the processing flow of the battery cell 10 can be: step S11, step S12, step S13, step S21, step S11, step S12, step S13, step S21, step S11, step S12, step S13... step S11, step S12, step S13, and so on.

[0356] By adopting the above technical solution, the electrode 11 can be stacked along the first direction Y to form M electrode modules E. By adjusting the value of M, the capacity regulation of the battery cell 10 can be achieved.

[0357] In some embodiments, please refer to FIG19, and in conjunction with other figures. FIG19 is a flowchart of a processing method for a battery cell 10 provided in some embodiments of this application. N≥2. After step S12, in which the third electrode 11c and the fourth electrode 11d of the electrode unit F are stacked along the first direction Y so that the third current collector 111c and the fourth current collector 111d of the fourth electrode 11d are stacked and electrically connected, before step S13, in which the fourth electrode 11d and the second electrode 11b are stacked so that the fourth film layer 112d of the fourth electrode 11d is disposed on the side of the fourth current collector 111d facing the second film layer 112b of the second electrode 11b, the following steps are included:

[0358] S15. Stack N electrode units F along the first direction Y.

[0359] Specifically, this step involves stacking N electrode units F sequentially along the first direction Y in the pattern of third electrode 11c, fourth electrode 11d, third electrode 11c, fourth electrode 11d... and the third current collector 111c and fourth current collector 111d of each electrode unit F are stacked sequentially along the first direction Y with the first electrode 11a pointing towards the second electrode 11b. The third film layer 112c of each third electrode 11c is located on the side of the third current collector 111c facing the first electrode 11a, and the fourth film layer 112d of each fourth electrode 11d is located on the side of the fourth current collector 111d facing away from the first electrode 11a.

[0360] By adopting the above technical solution, when multiple electrode sheets 11 are stacked along the first direction Y, multiple electrode sheet units F can be stacked in each electrode module E, thereby enabling voltage regulation of the battery cell 10.

[0361] As an example, the processing flow of the battery cell 10 can be: step S11, step S12, step S15, step S13, step S21, step S14, step S21, step S14, step S21, step S14... step S14, and so on.

[0362] Specifically, the processing flow of the battery cell 10 can be as follows: step S11, step S12, step S15, step S13, step S21, step S11, step S12, step S15, step S13, step S21, step S11, step S12, step S15, step S13... step S11, step S12, step S15, step S13, and so on.

[0363] In some embodiments, please refer to FIG20 and other accompanying drawings. Step S10, which involves stacking multiple electrode sheets 11 along the first direction Y to form M electrode modules E, and before the first electrode sheet 11a, N electrode units F, and the second electrode sheet 11b in the electrode module E are sequentially stacked and connected in series, includes the following steps:

[0364] S30. The current collectors 111 of the plurality of electrodes 11 are spaced apart on the insulating member 12 along the conveying direction a of the electrode assembly 1, so that each current collector 111 and each insulating part 121 of the insulating member 12 are alternately arranged in the conveying direction a of the electrode assembly 1, and the first film layer 112a, the second film layer 112b, the third film layer 112c and the fourth film layer 112d are disposed on the same side of the current collector 111 along the thickness direction b of the electrode 11.

[0365] In this step, multiple electrodes 11 can be connected together by an insulating member 12.

[0366] Based on this, the overall structure formed by connecting the insulating element 12 and multiple electrode plates 11 is stacked in a "Z" shape, which enables the operation of steps S10 and S20.

[0367] This configuration allows the stacking of the insulating component 12 and the stacking of multiple electrode sheets 11 to be carried out continuously or alternately, which simplifies the processing operation of stacking the insulating component 12 and multiple electrode sheets 11 to form the electrode assembly 1, thereby improving the processing efficiency of the battery cell 10.

[0368] Please refer to Figure 2 and other accompanying drawings. The battery device 100 provided in this embodiment includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the above embodiments; please refer to the relevant descriptions of the battery cell 10 in the above embodiments for details, which will not be repeated here.

[0369] The battery device 100 provided in this application embodiment, by employing the battery cells 10 involved in the above embodiments, can achieve capacity and voltage regulation at the battery cell 10 level. This reduces the need for corresponding series and parallel operations of multiple battery cells 10, thereby simplifying the electrical connection of the external circuit of the battery cell 10. This reduces the use of current collectors in the battery device 100, thereby helping to improve the energy density of the battery device 100.

[0370] Please refer to Figure 1 and other accompanying drawings. The electrical device provided in this application embodiment includes a battery cell 10 or a battery device 100. The battery cell 10 and battery device 100 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery cell 10 and battery device 100 in the above embodiments for details, which will not be repeated here.

[0371] The electrical device provided in this application embodiment, by employing the battery cell 10 or battery device 100 mentioned above, helps to improve the energy density of the electrical device.

[0372] As one embodiment of this application, as shown in Figures 4 to 10, the battery cell 10 includes an electrode assembly 1, which includes an insulator 12 and M electrode modules E. Each electrode module E includes multiple electrode sheets 11, and each electrode sheet 11 includes a current collector 111 and a film layer 112. All the electrode sheets 11 in the M electrode modules E are stacked along a first direction Y, which is parallel to the thickness direction b of the electrode sheet 11. In the electrode module E, all electrode sheets 11 include a first electrode sheet 11a, a second electrode sheet 11b, and N electrode sheet units F. The first electrode sheet 11a, the N electrode sheet units F, and the second electrode sheet 11b are stacked sequentially along the first direction Y and connected in series. M ≥ 2, N ≥ 1, and M and N are both positive integers. The electrode sheet unit F includes a third electrode sheet 11c and a fourth electrode sheet 11d. The current collector 111 of the first electrode sheet 11a is the first current collector 111a, and the film layer 112 of the first electrode sheet 11a is the first film layer 112a. The current collector 111 of the second electrode 11b is the second current collector 111b, and the film layer 112 of the second electrode 11b is the second film layer 112b. The current collector 111 of the third electrode 11c is the third current collector 111c, and the film layer 112 of the third electrode 11c is the third film layer 112c. The current collector 111 of the fourth electrode 11d is the fourth current collector 111d, and the film layer 112 of the fourth electrode 11d is the fourth film layer 112d. In the first direction Y, a first film layer 112a is disposed on the side of the first current collector 111a facing the electrode unit F, a second film layer 112b is disposed on the side of the second current collector 111b facing the electrode unit F, and a third current collector 111c and a fourth current collector 111d are stacked between the first film layer 112a and the second film layer 112b and electrically connected. The third film layer 112c is disposed on the side of the third current collector 111c facing the first film layer 112a, and the fourth film layer 112d is disposed on the side of the fourth current collector 111d facing the second film layer 112b. The polarity of the third film layer 112c is opposite to that of the fourth film layer 112d, the polarity of the first film layer 112a is opposite to that of the third film layer 112c, and the polarity of the fourth film layer 112d is opposite to that of the second film layer 112b. In the first direction Y, the first film layer 112a and the adjacent third film layer 112c are configured for ion conduction, and the second film layer 112b and the adjacent fourth film layer 112d are configured for ion conduction. When N≥2, N electrode units F are sequentially stacked between the first electrode 11a and the second electrode 11b. In the first direction Y, at least a portion of the insulating member 12 is disposed between two adjacent electrode modules E to provide electronic insulation between the two adjacent electrode modules E, thereby enabling the internal circuits of the M electrode modules E to be connected in parallel. In the conveying direction a of the electrode assembly 1, multiple electrode sheets 11 are spaced apart on the insulating member 12. When the electrode assembly 1 is in the unfolded state, the first film layer 112a, the second film layer 112b, the third film layer 112c, and the fourth film layer 112d are disposed on the same side of the current collector 111 along the thickness direction b.

[0373] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A battery cell, wherein, The electrode assembly includes an insulating component and M electrode modules, each electrode module comprising multiple electrode plates. All the electrodes in the M electrode modules are stacked along a first direction, which is parallel to the thickness direction of the electrodes; in the electrode module, all the electrodes include a first electrode, a second electrode, and N electrode units, each electrode unit including at least one electrode, and the first electrode, the N electrode units, and the second electrode are stacked sequentially and connected in series. Where M≥1, N≥1, and M and N are both positive integers; In the first direction, at least a portion of the insulating member is disposed on at least one side of the electrode module and is used to connect the M electrode modules in parallel.

2. The battery cell according to claim 1, wherein, The first electrode includes a first current collector and a first film layer, and the second electrode includes a second current collector and a second film layer; in the first direction, the first film layer is disposed on the side of the first current collector facing the electrode unit, the second film layer is disposed on the side of the second current collector facing the electrode unit, a third film layer is formed on the side of the electrode unit facing the first film layer, and a fourth film layer is formed on the side of the electrode unit facing the second film layer. The polarity of the third film layer is opposite to that of the fourth film layer, the polarity of the first film layer is opposite to that of the third film layer, and the polarity of the fourth film layer is opposite to that of the second film layer; in the first direction, the first film layer and the adjacent third film layer are configured to be ion-conducting, and the second film layer and the adjacent fourth film layer are configured to be ion-conducting.

3. The battery cell according to claim 2, wherein, M≥2; In the first direction, two adjacent electrode modules are respectively a first electrode module and a second electrode module, the second current collector of the first electrode module is closer to the second electrode module than the first current collector of the first electrode module, and at least a portion of the insulating member is disposed between the second current collector of the first electrode module and the first current collector of the second electrode module, so that the M electrode modules are connected in parallel.

4. The battery cell according to claim 2 or 3, wherein, N≥2; In the first direction, two adjacent electrode units are respectively a first electrode unit and a second electrode unit, the first electrode unit is disposed between the second electrode unit and the first electrode, and the fourth film layer of the first electrode unit and the third film layer of the second electrode unit are configured to be ion-conducting.

5. The battery cell according to any one of claims 2-4, wherein, The first membrane layer includes a first active material layer, and the third membrane layer includes a third active material layer; The first membrane layer further includes a first electrolyte layer, and the first active material layer is disposed between the first current collector and the first electrolyte layer; and / or, the third membrane layer further includes a third electrolyte layer, and the third electrolyte layer is disposed on the side of the third active material layer facing the first current collector.

6. The battery cell according to any one of claims 2-5, wherein, The second membrane layer includes a second active material layer, and the fourth membrane layer includes a fourth active material layer; The second membrane layer further includes a second electrolyte layer, and the second active material layer is disposed between the second current collector and the second electrolyte layer; and / or, the fourth membrane layer further includes a fourth electrolyte layer, and the fourth electrolyte layer is disposed on the side of the fourth active material layer facing the second current collector.

7. The battery cell according to any one of claims 2-6, wherein, N≥2, the third membrane layer includes a third active material layer, and the fourth membrane layer includes a fourth active material layer; The third membrane layer further includes a third electrolyte layer, which is disposed on the side of the third active material layer facing the first current collector; and / or, the fourth membrane layer further includes a fourth electrolyte layer, which is disposed on the side of the fourth active material layer facing the second current collector.

8. The battery cell according to any one of claims 2-7, wherein, On a projection plane perpendicular to the first direction, the projection of the first film layer extends beyond the outline of the projection of the third film layer; or, on a projection plane perpendicular to the first direction, the projection of the third film layer extends beyond the outline of the projection of the first film layer.

9. The battery cell according to any one of claims 2-8, wherein, On a projection plane perpendicular to the first direction, the projection of the second film layer extends beyond the outline of the projection of the fourth film layer; or, on a projection plane perpendicular to the first direction, the projection of the fourth film layer extends beyond the outline of the projection of the second film layer.

10. The battery cell according to any one of claims 2-9, wherein, N≥2； On a projection plane perpendicular to the first direction, the projection of the third film layer extends beyond the outline of the projection of the fourth film layer; Alternatively, on a projection plane perpendicular to the first direction, the projection of the fourth film layer extends beyond the outline of the projection of the third film layer.

11. The battery cell according to any one of claims 1-10, wherein, The insulating component includes multiple insulating portions; in the conveying direction of the electrode assembly, multiple electrode pieces and multiple insulating portions are spaced apart, and each electrode piece and each insulating portion is arranged alternately. In the first direction, the insulating portion is provided on at least one side of the electrode module.

12. The battery cell according to claim 11, wherein, The plurality of insulating portions include a first insulating portion; M≥2; in the first direction, the first insulating portion is disposed between two adjacent electrode modules.

13. The battery cell according to claim 12, wherein, The plurality of insulating portions include a second insulating portion and a third insulating portion; in the first direction, the second insulating portion and the third insulating portion are respectively formed on both sides of the electrode assembly.

14. The battery cell according to any one of claims 2-10, wherein, The electrode unit includes a third electrode and a fourth electrode. The third electrode includes a third current collector and a third film layer. The fourth electrode includes a fourth current collector and a fourth film layer. In the first direction, the third current collector and the fourth current collector are stacked and electrically connected. The third film layer is disposed on the side of the third current collector facing the first film layer, and the fourth film layer is disposed on the side of the fourth current collector facing the second film layer.

15. The battery cell according to claim 14, wherein, The insulating component includes multiple insulating portions; in the conveying direction of the electrode assembly, multiple electrode pieces and multiple insulating portions are spaced apart, and each electrode piece and each insulating portion is arranged alternately. In the first direction, the insulating portion is provided on at least one side of the electrode module; The electrode includes a current collector, wherein the current collector of the first electrode, the current collector of the second electrode, the current collector of the third electrode, and the current collector of the fourth electrode are respectively the first current collector, the second current collector, the third current collector, and the fourth current collector; When the electrode assembly is in the deployed state, the first film layer, the second film layer, the third film layer, and the fourth film layer are disposed on the same side of the current collector along the thickness direction of the electrode sheet.

16. The battery cell according to claim 15, wherein, In the carrying direction of the electrode assembly, the insulating portion arranged between the first current collector and the adjacent third current collector is a fourth insulating portion, the insulating portion arranged between the second current collector and the adjacent fourth current collector is a fifth insulating portion, and the insulating portion arranged between the third current collector and the fourth current collector is a sixth insulating portion. The fourth and fifth insulating portions are disposed on one side of the current collector along the second direction, and the sixth insulating portion is disposed on the other side of the current collector along the second direction, wherein the second direction is perpendicular to the first direction.

17. The battery cell according to claim 16, wherein, N≥2; In the carrying direction of the electrode assembly, the insulating portion arranged between two adjacent electrode units is the seventh insulating portion; In the second direction, the seventh insulating portion is disposed on the side of the current collector away from the sixth insulating portion.

18. The battery cell according to any one of claims 15-17, wherein, In the carrying direction of the electrode assembly, at least one of the insulating portions is connected to two adjacent current collectors at both ends; And / or, the insulating member further includes a connecting portion between two adjacent insulating portions, and at least one of the current collectors is disposed on the connecting portion.

19. The battery cell according to any one of claims 15-18, wherein, The thickness of the current collector is greater than the thickness of the insulating part.

20. The battery cell according to claim 18, wherein, The electrode further includes a film layer, wherein the film layer of the first electrode, the film layer of the second electrode, the film layer of the third electrode, and the film layer of the fourth electrode are respectively the first film layer, the second film layer, the third film layer, and the fourth film layer; At least one of the current collectors includes a first conductive layer and a second conductive layer electrically connected to the first conductive layer; in the thickness direction of the electrode, the first conductive layer and the second conductive layer are respectively disposed on both sides of the connection portion, and the film layer is disposed on the side of the first conductive layer away from the second conductive layer.

21. The battery cell according to any one of claims 14-20, wherein, The polarity of the first current collector is opposite to that of the third current collector, the polarity of the second current collector is opposite to that of the fourth current collector, and the polarity of the third current collector is opposite to that of the fourth current collector.

22. The battery cell according to any one of claims 1-21, wherein, The electrode module further includes a first electrode tab and a second electrode tab, wherein the first electrode tab is electrically connected to the first electrode plate and the second electrode tab is electrically connected to the second electrode plate.

23. The battery cell according to any one of claims 2-10 or any one of claims 14-21, wherein, The electrode module further includes a first electrode tab, which is integrally formed with the first current collector; And / or, the electrode module further includes a second tab, the second tab and the second current collector being integrally formed.

24. The battery cell according to any one of claims 1-23, wherein, M≥2, and the value of N is the same in all M electrode modules.

25. A method for processing a single battery cell, wherein, Applied to a battery cell according to any one of claims 1-24; the processing method of the battery cell includes: Multiple electrodes are stacked along a first direction to form M electrode modules, wherein the first electrode, N electrode units, and the second electrode in the electrode module are stacked sequentially and connected in series. At least a portion of the insulating element is disposed on at least one side of the electrode module along the first direction.

26. The method for processing a battery cell according to claim 25, wherein, The step of stacking multiple electrodes along a first direction to form M electrode modules, wherein the first electrode, N electrode units, and the second electrode in each electrode module are stacked sequentially and connected in series, includes: The first electrode and the third electrode of the electrode unit are stacked along the first direction, so that the third film layer of the third electrode is disposed on the side of the third current collector of the third electrode facing the first film layer of the first electrode. The third electrode and the fourth electrode of the electrode unit are stacked along the first direction so that the third current collector and the fourth current collector of the fourth electrode are stacked and electrically connected. The fourth electrode and the second electrode are stacked so that the fourth film layer of the fourth electrode is disposed on the side of the fourth current collector facing the second film layer of the second electrode.

27. The method for processing a battery cell according to claim 26, wherein, M≥2; the step of stacking multiple electrodes along a first direction to form M electrode modules, wherein the first electrode, N electrode units, and the second electrode in each electrode module are stacked sequentially and connected in series, further includes: M electrode modules are stacked along the first direction; The step of disposing at least a portion of the insulating element on at least one side of the electrode module along the first direction includes: At least a portion of the insulating element is disposed between two adjacent electrode modules.

28. The method for processing a battery cell according to claim 26 or 27, wherein, N≥2; the step of stacking the third electrode and the fourth electrode of the electrode unit along the first direction, so that the third current collector and the fourth current collector of the fourth electrode are stacked and electrically connected, and then stacking the fourth electrode and the second electrode, so that the fourth film layer of the fourth electrode is disposed before the side of the fourth current collector facing the second film layer of the second electrode, includes: N electrode units are stacked along the first direction.

29. The method for processing a battery cell according to any one of claims 26-28, wherein, The step of stacking multiple electrodes along a first direction to form M electrode modules, and before the first electrode, N electrode units, and the second electrode in each electrode module are stacked sequentially and connected in series, includes: The current collectors of the plurality of electrodes are spaced apart on the insulating member along the carrying direction of the electrode assembly, so that each current collector and each insulating part of the insulating member are alternately arranged in the carrying direction of the electrode assembly, and the first film layer, the second film layer, the third film layer and the fourth film layer are disposed on the same side of the current collector along the thickness direction of the electrode.

30. A battery device, wherein, Includes the battery cell according to any one of claims 1-24.

31. An electrical device, wherein, It includes a battery cell according to any one of claims 1-24; or, it includes a battery device according to claim 30.

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