Assembly method and assembly apparatus

Abstract

An assembly method and an assembly apparatus. The assembly method is used for assembling a battery unit; the battery unit comprises a housing and a plurality of battery cell assemblies connected in series and / or in parallel and accommodated in the housing; each battery cell assembly comprises an active substance coating part and a conductive part; the conductive part is located at one end of the battery cell assembly in the first direction and is used for electrically connecting the active substance coating part and an electrode post of the battery unit; the assembly method comprises the following steps: stacking the plurality of battery cell assemblies in a second direction, the second direction being perpendicular to the first direction; electrically connecting the conductive parts of the plurality of battery cell assemblies; and placing the plurality of battery cell assemblies into the housing.

Description

Assembly method and assembly device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311244465.7 and application date September 25, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of battery assembly, and in particular to an assembly method and an assembly device. Background Art

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, batteries, as the power source, play an irreplaceable and important role. Batteries typically consist of multiple cells, and the current assembly process for these cells is cumbersome and inefficient.

[0005] Summary of the Invention

[0006] The present application proposes an assembly method and an assembly device, which are conducive to simplifying the assembly process of battery cells, improving assembly efficiency, and reducing the occupied area of ​​multiple battery cell components during the assembly process of battery cells, thereby reducing the risk of pulling on the conductive parts during assembly and transportation.

[0007] In a first aspect, an embodiment of the present application provides an assembly method, which is used to assemble a battery cell. The battery cell includes a shell and a plurality of battery cell assemblies connected in series and / or in parallel and housed in the shell. Each battery cell assembly includes an active material coating portion and a conductive portion. The conductive portion is located at one end of the battery cell assembly in a first direction and is used to electrically connect the active material coating portion and the pole of the battery cell. The assembly method includes: stacking a plurality of battery cell assemblies along a second direction, which is perpendicular to the first direction; electrically connecting the conductive portions of the plurality of battery cell assemblies; and placing the plurality of battery cell assemblies into the shell.

[0008] In the above technical solution, the electrical connection operation of multiple battery cell assemblies is performed while the multiple battery cell assemblies are kept stacked along the second direction. During the above operation, the occupied area of ​​the multiple battery cell assemblies is small, which facilitates the stacking of the multiple battery cell assemblies on the logistics line for transportation. When the second direction is the up and down direction, the lowermost battery cell assembly among the multiple battery cell assemblies contacts the logistics line to reduce the risk of relative movement between the multiple battery cell assemblies. Therefore, after the conductive parts of the multiple battery cell assemblies are electrically connected and the multiple battery cell assemblies are transported on the logistics line, the risk of the conductive parts connected to each other by the multiple battery cell assemblies being pulled can be effectively reduced, the risk of the conductive parts cracking can be reduced, and the reliability of the multiple battery cell assemblies can be improved. Moreover, during the electrical connection and shelling operation of the multiple battery cell assemblies, the multiple battery cell assemblies are kept in the state of being stacked along the second direction for corresponding operations, so that the relative postures of the multiple battery cell assemblies before and after being placed in the shell body are consistent. Therefore, during the assembly process of the battery cell, the relative placement postures of the multiple battery cell assemblies before and after being placed in the shell do not need to be adjusted, so as to simplify the assembly process of the battery cell.

[0009] In some embodiments, the battery cell assembly has multiple side walls, the first side wall having the largest area among the multiple side walls, and stacking the multiple battery cell assemblies along the second direction includes: arranging the first side walls of two adjacent battery cell assemblies back to back and / or opposite to each other along the second direction.

[0010] In the above technical solution, the first side walls of the two battery cell assemblies are arranged back to back and / or opposite to each other along the second direction to improve the stability of the multiple battery cell assemblies stacked along the second direction, so that the multiple battery cell assemblies can be transported on the logistics line in the above stacking posture to improve production efficiency.

[0011] In some embodiments, electrically connecting the conductive parts of multiple battery cell assemblies includes: gathering multiple pole tabs of the conductive parts of the multiple battery cell assemblies so that the positions of the multiple pole tabs close to the active material coating portion are gathered to form a first gathered portion, and the positions of the multiple pole tabs away from the active material coating portion are gathered to form a second gathered portion, and pre-connecting the second gathered portion.

[0012] In the above technical solution, the pole tabs of multiple battery cell assemblies are first gathered together to form a first gathering portion and a second gathering portion, so as to realize the shaping of multiple pole tabs. Subsequently, corresponding operations are performed on the first gathering portion and the second gathering portion to realize corresponding operations on multiple pole tabs, which is beneficial to improving assembly efficiency; at the same time, the second gathering portion is pre-connected so that the second gathering portion is formed into a whole to reduce the interlayer gap between multiple pole tabs in the second gathering portion, for example, it is convenient for multiple pole tabs to form a plate structure with a certain rigidity, thereby facilitating direct or indirect electrical connection between the second gathering portion and the pole, and facilitating subsequent operations.

[0013] In some embodiments, after pre-connecting the second retracted portion and before placing the multiple battery cell assemblies into the shell body, the assembly method further includes: passing the second retracted portion through the avoidance hole on the bracket so that at least part of the second retracted portion extends to the side of the bracket away from the active material coating portion, and the bracket cover is arranged on the outer peripheral side of the multiple battery cell assemblies.

[0014] In the above technical solution, by arranging a bracket, the second folding part extends to the side of the bracket away from the active material coating part through the avoidance hole, so that the arrangement of the bracket will not affect the electrical connection between the second folding part and the corresponding pole. At the same time, the bracket can be covered on the outer peripheral wall of multiple active material coating parts to play a certain limiting role on the multiple active material coating parts, which is convenient for subsequent shell insertion operations, and the bracket can enter the shell body before the active material coating part, so the bracket can play a certain protective role on the active material coating part, reducing the risk of the shell body scratching the active material coating part; at the same time, the avoidance hole on the bracket can have a certain limiting effect on the second folding part to a certain extent, so as to improve the stability of the second folding part and the first folding part in maintaining their folded state, play a certain supporting and shaping role on the conductive part, reduce the risk of cracking of the first folding part and the second folding part, and can separate the active material coating part from the shell body, reduce the risk of short circuit connection between the conductive part and the active material coating part, and improve the reliability of the battery cell.

[0015] In some embodiments, the conductive part also includes an adapter plate. After the second retracted part is pre-connected and before the multiple battery cell assemblies are placed in the shell body, the assembly method also includes: fixing the adapter plate to the second retracted part, and passing the adapter plate and the second retracted part through the avoidance hole on the bracket, so that at least part of the second retracted part and the adapter plate extend to the side of the bracket away from the active material coating part, and the bracket cover is arranged on the outer peripheral side of the multiple battery cell assemblies; or, passing the second retracted part through the avoidance hole on the bracket, so that at least part of the second retracted part extends to the side of the bracket away from the active material coating part, and the bracket cover is arranged on the outer peripheral side of the multiple battery cell assemblies, and the adapter plate is fixed to at least part of the second retracted part.

[0016] In the above technical solution, by arranging a bracket, the second folding part extends to the side of the bracket away from the active material coating part through the avoidance hole, so that the arrangement of the bracket will not affect the electrical connection between the adapter and the corresponding pole. At the same time, the bracket can be covered on the outer peripheral wall of multiple active material coating parts to play a certain limiting role on the multiple active material coating parts, which is convenient for subsequent shell insertion operations, and the bracket can enter the shell body before the active material coating part, so the bracket can play a certain protective role on the active material coating part, reducing the risk of the shell body scratching the active material coating part; at the same time, the avoidance hole on the bracket can have a certain limiting effect on the second folding part to a certain extent, so as to improve the stability of the second folding part and the first folding part in maintaining their folded state, play a certain supporting and shaping role on the conductive part, reduce the risk of cracking of the first folding part and the second folding part, and can separate the active material coating part from the shell body, reduce the risk of short circuit connection between the conductive part and the active material coating part, and improve the reliability of the battery cell.

[0017] In some embodiments, before placing the plurality of battery cell assemblies into the shell body, the assembly method further includes: wrapping an insulating member around the active material coating portion, and connecting the insulating member to the bracket.

[0018] In the above technical solution, on the one hand, by wrapping the insulating part outside the active material coating part, the insulation reliability between the active material coating part and the shell body can be improved, the corrosion of the shell body caused by the contact between the active material coating part and the shell body can be reduced or prevented, and the leakage of electrolyte caused by shell body corrosion can be reduced, thereby improving the reliability of the battery cell; on the other hand, by connecting the insulating part with the bracket, the difficulty of fixing the insulating part can be reduced, and the reliability of the insulating part wrapped outside the active material coating part can be improved; on the other hand, the insulating part and the bracket can basically wrap multiple battery cell components, and during the subsequent shell insertion operation, the risk of the battery cell components being scratched by the shell body can be further reduced, thereby improving the reliability of the battery cell.

[0019] In some embodiments, after placing the plurality of battery cell assemblies into the shell body, the assembly method further includes: fixing a shell cover to the open end of the shell body so that the shell cover closes the open end of the shell body; and fixing the conductive part to the pole.

[0020] In the above technical solution, by fixing the shell cover to the open end of the shell body, multiple battery cell assemblies are enclosed in the accommodating cavity defined by the shell body and the shell cover, thereby achieving reliable packaging of multiple battery cell assemblies; by fixing the conductive part to the pole, electrical connection between the conductive part and the pole is achieved, so as to achieve normal charging and discharging of the battery cell.

[0021] In some embodiments, the pole is formed with a receiving groove, the notch of the receiving groove is formed on the side surface of the pole away from the battery cell assembly, and a through-hole is formed on the groove wall of the receiving groove adjacent to the battery cell assembly. The assembly method includes: assembling and fixing the pole to the shell body; and passing the conductive part through the through-hole.

[0022] In the above technical solution, the pole and the shell body can be assembled and fixed first, and then the conductive part can be passed through the through-hole to facilitate the assembly of the shell body, pole and battery cell assembly, thereby improving assembly efficiency; moreover, after the conductive part is passed through the through-hole, the conductive part and the pole are fixed, so that a part of the conductive part can be accommodated in the accommodating groove. The provision of the accommodating groove can, on the one hand, reduce the weight of the pole, which is conducive to improving the weight energy density of the battery cell; on the other hand, it can accommodate a part of the conductive part, so that the conductive part can be stored and sorted through the notch of the accommodating groove, and it is convenient to realize the operation of fixing the conductive part to the pole through the notch of the accommodating groove, thereby reducing the difficulty of assembly.

[0023] In some embodiments, after the conductive portion is fixedly connected to the pole, the assembly method further includes: fixing a cover plate at a notch of the receiving groove so that the cover plate closes the notch of the receiving groove.

[0024] In the above technical solution, by sealing the notch of the receiving tank with a cover plate, the electrolyte in the shell body can be prevented from leaking from the notch of the receiving tank; moreover, when the cover plate is electrically connected to the pole, it is convenient to use the cover plate to realize indirect electrical connection between the pole and the busbar component, which is beneficial to increase the connection area of ​​the electrical connection position and facilitate reducing the resistance at the electrical connection position.

[0025] In a second aspect, an embodiment of the present application provides an assembly device for assembling battery cells, wherein the battery cell includes a shell body and a plurality of battery cell assemblies connected in series and / or in parallel and housed in the shell body, each battery cell assembly including an active material coating portion and a conductive portion, the conductive portion being located at one end of the battery cell assembly in a first direction and being used to electrically connect the active material coating portion and the pole of the battery cell, the assembly device including: a stacking tool for stacking a plurality of battery cell assemblies along a second direction, the second direction being perpendicular to the first direction; a first fixing tool for fixing and connecting the conductive portions of the plurality of battery cell assemblies; and a shell insertion tool for placing the plurality of battery cell assemblies into the shell body.

[0026] In the above technical solution, a plurality of battery cell assemblies are stacked along the second direction by setting a stacking tool to reduce the occupied area of ​​the plurality of battery cell assemblies during subsequent transportation, operation, etc., and when the second direction is the up and down direction, the lowest battery cell assembly among the plurality of battery cell assemblies is in contact with the logistics line to reduce the risk of relative movement between the plurality of battery cell assemblies, so that after the conductive parts of the plurality of battery cell assemblies are electrically connected and the plurality of battery cell assemblies are transported on the logistics line, the risk of the conductive parts connected to each other by the plurality of battery cell assemblies being pulled can be effectively reduced, the risk of the conductive parts being cracked can be reduced, and the reliability of the plurality of battery cell assemblies can be improved; moreover, during the electrical connection and shelling operation of the plurality of battery cell assemblies, the plurality of battery cell assemblies are kept in a stacked state along the second direction for corresponding operations, so that the relative postures of the plurality of battery cell assemblies before and after being placed in the shell body are consistent, so that during the assembly process of the battery cell, the assembly device does not need to adjust the relative placement postures of the plurality of battery cell assemblies before and after being placed in the shell, so as to simplify the structure of the assembly device and simplify the assembly process of the battery cell.

[0027] In some embodiments, the assembly device also includes: a folding tool for folding the conductive parts of multiple battery cell assemblies, so that the conductive parts of the multiple battery cell assemblies converge at a position close to the active material coating part to form a first folding part, and the conductive parts of the multiple battery cell assemblies converge at a position away from the active material coating part to form a second folding part, and the first fixing tool is used to pre-connect the second folding part.

[0028] In the above technical solution, a gathering tool is provided to gather the conductive parts of multiple battery cell assemblies to form a first gathering part and a second gathering part, so as to realize the shaping of multiple conductive parts. Subsequently, corresponding operations are performed on the first gathering part and the second gathering part to realize corresponding operations on multiple conductive parts, which is beneficial to improving assembly efficiency; at the same time, the second gathering part is pre-connected by the first fixing tool, so that the second gathering part is formed into a whole, so as to reduce the interlayer gap between multiple pole tabs in the second gathering part, for example, it is convenient for multiple pole tabs to form a plate structure with a certain rigidity, thereby facilitating direct or indirect electrical connection between the second gathering part and the pole, and facilitating subsequent operations.

[0029] In some embodiments, the assembly device also includes: an auxiliary tooling, suitable for being detachably connected to the second folding part, and used to drive the second folding part to pass through the avoidance hole on the bracket, so that at least part of the second folding part extends to the side of the bracket away from the active material coating part.

[0030] In the above technical solution, an auxiliary tooling is provided to drive the second folding part to pass through the avoidance hole on the bracket, so as to facilitate the assembly of the second folding part and the bracket, and facilitate the assembly of the active substance coating part and the bracket, and the auxiliary tooling is detachably connected to the second folding part. After completing the corresponding operation, the auxiliary tooling can be separated from the second folding part without affecting subsequent operations.

[0031] In some embodiments, the assembly device further includes: a covering tool for covering the insulating member outside the active material coating portion; and a second fixing tool for fixing the insulating member to the bracket.

[0032] In the above technical solution, a covering tool is provided to cover the insulating part and the outside of the active material coating part, and the insulating part and the bracket are fixed by a second fixing tool, so as to improve the covering reliability of the insulating part and improve the insulation performance between the multiple battery cell components and the shell body, thereby improving the reliability of the battery single body; moreover, the insulating part and the bracket can provide a certain protection for the multiple battery cell components, reducing the risk of the battery cell components being scratched by the shell body during the process of inserting the multiple battery cell components into the shell.

[0033] In some embodiments, the assembly device further includes: a third fixing fixture for fixing the shell cover to the open end of the shell body and for fixing the conductive part to the pole; and a fourth fixing fixture for assembling and fixing the pole to the shell body.

[0034] In the above technical solution, the shell cover is fixed to the shell body and the open end of the shell body is closed by setting a third tool, so that the multiple battery cell assemblies are enclosed in the accommodating cavity defined by the shell body and the shell cover, thereby realizing reliable packaging of the multiple battery cell assemblies, and the third fixing tool can fix the conductive part and the pole to realize the electrical connection between the conductive part and the pole, so as to realize normal charging and discharging of the battery cell; the pole and the shell body are fixed by setting a fourth fixing tool to realize the assembly of the pole and the shell body.

[0035] In some embodiments, the pole is formed with a receiving groove, the notch of the receiving groove is formed on the side surface of the pole away from the battery cell assembly, and a perforation is formed on the groove wall of the receiving groove adjacent to the battery cell assembly. The assembly device also includes: a fifth fixing tool for fixing the cover plate at the notch of the receiving groove.

[0036] In the above technical solution, the cover plate is fixed to the notch of the receiving tank by setting a fifth fixing tool, so that the cover plate is fixed to the pole, so that the cover plate closes the notch of the receiving tank, which can prevent the electrolyte in the shell body from leaking from the notch of the receiving tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] FIG1 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0039] FIG2 is a schematic flow chart of an assembly method provided in some embodiments of the present application;

[0040] FIG3 is a schematic flow chart of an assembly method provided in some embodiments of the present application;

[0041] FIG4 is a schematic flow chart of an assembly method provided in some embodiments of the present application;

[0042] FIG5 is a schematic flow chart of an assembly method provided in some embodiments of the present application;

[0043] FIG6 is a schematic flow chart of an assembly method according to some embodiments of the present application;

[0044] FIG7 is a schematic flow chart of an assembly method provided in some embodiments of the present application;

[0045] FIG8 is a schematic flow chart of an assembly method according to some embodiments of the present application;

[0046] FIG9 is a schematic flow chart of an assembly method provided in some embodiments of the present application;

[0047] FIG10 is a schematic flow chart of an assembly method according to some embodiments of the present application;

[0048] FIG11 is a schematic diagram of the assembly process of a battery cell provided in some embodiments of the present application;

[0049] FIG12 is a schematic diagram of two different implementations of multiple battery cell assemblies provided in some embodiments of the present application;

[0050] FIG13 is a schematic diagram of an assembly device provided in some embodiments of the present application. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0053] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0054] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0055] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the various directions in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation on the present application.

[0056] The term "plurality" used in this application refers to two or more (including two).

[0057] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0058] For example, a battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to hold the cell assembly and electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. A battery cell may have one or more cell assemblies, each of which is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator.

[0059] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode column. For example, the stacked multiple positive electrode tabs can be directly welded to the positive electrode column to form an electrical connection. Alternatively, the battery cell assembly may further include a positive electrode adapter. The stacked multiple positive electrode tabs are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode column to form an electrical connection between the positive electrode tab and the positive electrode column.

[0060] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. For example, the multiple stacked negative electrode tabs can be directly welded to the negative electrode column to form an electrical connection; alternatively, the battery cell assembly can further include a negative electrode adapter. The multiple stacked negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode column to form an electrical connection between the negative electrode tab and the negative electrode column. The material of the separator is not limited, and can be, for example, polypropylene or polyethylene.

[0061] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, batteries, as the power source, play an irreplaceable and important role. Batteries typically consist of multiple cells, and the current assembly process for these cells is cumbersome and inefficient.

[0062] In the related art, a battery cell includes a plurality of battery cell assemblies. During the assembly process of the battery cell, the plurality of battery cell assemblies are kept in a lying manner (for example, the two large surfaces of each battery cell assembly are arranged relative to each other up and down, and the plurality of battery cell assemblies are dispersed on the logistics line) for transportation and electrical connection of the conductive parts of the plurality of battery cell assemblies. As a result, the plurality of battery cell assemblies occupy a large area during the assembly process. In addition, during transportation on the logistics line, the plurality of battery cell assemblies may move relative to each other, so that the conductive parts of the plurality of battery cell assemblies connected to each other are easily pulled, resulting in cracking of the conductive parts, especially the tabs of the plurality of battery cell assemblies are pulled, resulting in cracking of the tabs. At the same time, when the plurality of battery cell assemblies are subsequently placed in the shell of the battery cell, the relative placement state of the plurality of battery cell assemblies needs to be changed so that each of the plurality of battery cell assemblies changes from a lying state to a state in which the plurality of battery cell assemblies are stacked in sequence, making the assembly process cumbersome.

[0063] Based on the above considerations, in order to simplify the assembly process of battery cells and improve assembly efficiency, an embodiment of the present application proposes an assembly method, which is used to assemble batteries. The battery cell includes a shell body and a plurality of battery cell assemblies connected in series and / or in parallel and housed in the shell body. Each battery cell assembly includes an active material coating portion and a conductive portion. The conductive portion is located at one end of the battery cell assembly in a first direction and is used to electrically connect the active material coating portion and the pole of the battery cell. The assembly method includes: stacking multiple battery cell assemblies along a second direction, which is perpendicular to the first direction; electrically connecting the conductive portions of the multiple battery cell assemblies; and placing the multiple battery cell assemblies into the shell body.

[0064] In the above technical solution, the electrical connection operation of multiple battery cell assemblies is performed while the multiple battery cell assemblies are kept stacked along the second direction. During the above operation, the occupied area of ​​the multiple battery cell assemblies is small, which facilitates the stacking of the multiple battery cell assemblies on the logistics line for transportation. When the second direction is the up and down direction, the lowermost battery cell assembly among the multiple battery cell assemblies contacts the logistics line to reduce the risk of relative movement between the multiple battery cell assemblies. Therefore, after the conductive parts of the multiple battery cell assemblies are electrically connected and the multiple battery cell assemblies are transported on the logistics line, the risk of the conductive parts connected to each other by the multiple battery cell assemblies being pulled can be effectively reduced, the risk of the conductive parts cracking can be reduced, and the reliability of the multiple battery cell assemblies can be improved. Moreover, during the electrical connection and shelling operation of the multiple battery cell assemblies, the multiple battery cell assemblies are kept in the state of being stacked along the second direction for corresponding operations, so that the relative postures of the multiple battery cell assemblies before and after being placed in the shell body are consistent. Therefore, during the assembly process of the battery cell, the relative placement postures of the multiple battery cell assemblies before and after being placed in the shell do not need to be adjusted, so as to simplify the assembly process of the battery cell.

[0065] Of course, the second direction is not limited to the up-down direction. For example, the second direction can also be the left-right direction, or the front-back direction, etc.

[0066] Please refer to Figure 1, which is a cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 is a rectangular parallelepiped, with the height of the battery cell 10 being in a first direction X, the length of the battery cell 10 being in a third direction Z (i.e., perpendicular to the paper in Figure 1), and the thickness of the battery cell 10 being in a second direction Y. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular. However, this is not limiting. In other embodiments of the present application, the battery cell 10 may also be a polygonal prism, a flat body, or other shapes.

[0067] The battery cell 10 may include two battery cell assemblies 2, and the two battery cell assemblies 2 may be arranged sequentially along the first direction. The conductive portion 22 of each battery cell assembly 2 is located at one end of the battery cell assembly 2 in the first direction, and the conductive portions 22 of multiple battery cell assemblies 2 may be located on the same side of the multiple battery cell assemblies 2 in the first direction; of course, the battery cell 10 may also include three or more battery cell assemblies 2.

[0068] Please refer to Figures 1 and 2. Figure 2 is a flow chart of the assembly method provided in some embodiments of the present application. In the embodiments of the present application, the assembly method is used to assemble a battery cell 10. The battery cell 10 includes a shell 1 and multiple battery cell assemblies 2 accommodated in the shell 1. The multiple battery cell assemblies 2 are connected in series and / or in parallel. The multiple battery cell assemblies 2 of the battery cell 10 can be connected in series, in parallel or in mixed connection. Mixed connection means that the multiple battery cell assemblies 2 are both connected in series and in parallel. Each battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is the portion of the battery cell assembly 2 coated with active material, which can assist in the deintercalation of metal ions during the charging and discharging process of the battery cell 10. The conductive portion 22 is located at one end of the battery cell assembly 2 in the first direction, and the conductive portion 22 is used to electrically connect the active material coating portion 21 and the pole 5 of the battery cell 10. The conductive portion 22 can be a structure that electrically connects the active material coating portion 21 and the pole 5, which is not coated with active material.

[0069] It should be noted that in the embodiments of the present application, the active material coating portion 21 is divided into a positive electrode active material coating portion and a negative electrode active material coating portion. The positive electrode active material coating portion includes the portion of the positive electrode current collector coated with the positive electrode active material layer, and the negative electrode active material coating portion includes the portion of the negative electrode current collector coated with the negative electrode active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion. The positive electrode conductive portion electrically connects the positive electrode active material coating portion and the positive electrode post, and the negative electrode conductive portion electrically connects the negative electrode active material coating portion and the negative electrode post.

[0070] In an embodiment of the present application, the assembly method includes: stacking multiple battery cell assemblies 2 along a second direction, the second direction being perpendicular to the first direction; electrically connecting the conductive parts 22 of the multiple battery cell assemblies 2 to achieve paired connection of the multiple battery cell assemblies 2; placing the multiple battery cell assemblies 2 into the shell body 1, and the multiple battery cell assemblies 2 can be placed into the shell body 1 in a stacked posture along the second direction.

[0071] It can be seen that in the above technical solution, the electrical connection operation of the multiple battery cell assemblies 2 is performed when the multiple battery cell assemblies 2 are kept stacked along the second direction. Then, during the above operation, the occupied area of ​​the multiple battery cell assemblies 2 is small, which is convenient for the multiple battery cell assemblies 2 to be stacked on the logistics line for transportation. When the second direction is the up and down direction, the lowermost battery cell assembly 2 among the multiple battery cell assemblies 2 is in contact with the logistics line to reduce the risk of relative movement between the multiple battery cell assemblies 2. Therefore, after the conductive parts 22 of the multiple battery cell assemblies 2 are electrically connected and the multiple battery cell assemblies 2 are transported on the logistics line, the risk of the multiple battery cell assemblies 2 being transported can be effectively reduced. 2, the risk of the conductive parts 22 connected to each other being pulled is reduced, the risk of the conductive parts 22 being cracked is reduced, and the reliability of the multiple battery cell assemblies 2 is improved; moreover, during the electrical connection and shell insertion operations of the multiple battery cell assemblies 2, the multiple battery cell assemblies 2 are kept in a stacked state along the second direction for corresponding operations, so that the relative postures of the multiple battery cell assemblies 2 before and after being placed in the shell body 1 are consistent, so that during the assembly process of the battery cell 10, the relative placement postures of the multiple battery cell assemblies 2 before and after being placed in the shell can be no longer adjusted, thereby simplifying the assembly process of the battery cell 10.

[0072] In addition, since in the embodiment of the present application, multiple battery cell assemblies 2 are stacked along the second direction, the conductive parts 22 of the multiple battery cell assemblies 2 can be located on the same side of the multiple battery cell assemblies 2 in the first direction, so that the conductive parts 22 of different battery cell assemblies 2 can correspond and be electrically connected.

[0073] Please refer to Figure 1 and Figure 11. In some embodiments of the present application, the battery cell assembly 2 has multiple side walls, and the first side wall 20 has the largest area among the multiple side walls. The first side wall 20 can be the "large surface" of the battery cell assembly 2.

[0074] Stacking the plurality of battery cell assemblies 2 along the second direction includes: arranging the first side walls 20 of two adjacent battery cell assemblies 2 back to back and / or opposite to each other along the second direction.

[0075] In the above technical solution, the first side walls 20 of the two battery cell assemblies 2 are arranged back to back and / or opposite to each other along the second direction so as to improve the stability of the stacking of multiple battery cell assemblies 2 along the second direction, and facilitate the multiple battery cell assemblies 2 to maintain the above stacking posture for transportation on the logistics line, so as to improve production efficiency.

[0076] For example, if the battery cell assembly 2 includes a first side wall 20, the first side walls 20 of two adjacent battery cell assemblies 2 can be arranged relative to each other or back to back along the second direction to achieve stacking of two adjacent battery cell assemblies 2 along the second direction; if the battery cell assembly 2 includes two first side walls 20 arranged relative to each other along the first direction, one of the first side walls 20 of one of the two adjacent battery cell assemblies 2 can be arranged relative to one of the first side walls 20 of the other battery cell assembly 2, and the other first side wall 20 of one of the battery cell assemblies 2 can be arranged back to back with the other first side wall 20 of the other battery cell assembly 2.

[0077] Please refer to Figures 3 and 11. In some embodiments of the present application, the above-mentioned electrical connection of the conductive parts 22 of the multiple battery cell assemblies 2 includes: gathering the multiple pole tabs 221 of the conductive parts 22 of the multiple battery cell assemblies 2, so that the multiple pole tabs 221 are gathered at positions close to the active material coating part 21 (that is, gathered in a direction close to each other) to form a first gathered portion 221a, and the multiple pole tabs 221 are gathered at positions away from the active material coating part 21 to form a second gathered portion 221b, and pre-connecting the second gathered portion 221b to form a connecting current path for the pole tabs 221.

[0078] Exemplarily, the active material coating portion 21 may include a current collector and an active material layer provided on the current collector, the conductive portion 22 includes a pole ear portion electrically connected to the current collector, the pole ear portion includes a plurality of pole ear sheets 221, and the pole ear sheets 221 are structures that are electrically connected to the current collector but are not coated with active material. For example, the pole ear sheets 221 can be formed by directly die-cutting the current collector.

[0079] In the above technical solution, the pole tabs 221 of multiple battery cell assemblies 2 are first gathered to form a first gathering portion 221a and a second gathering portion 221b, so as to realize the shaping of the multiple pole tabs 221, and then the first gathering portion 221a and the second gathering portion 221b are operated accordingly to realize the corresponding operation of the multiple pole tabs 221, which is beneficial to improve the assembly efficiency; at the same time, the second gathering portion 221b is pre-connected so that the second gathering portion 221b is formed into a whole to reduce the interlayer gap of the multiple pole tabs 221 in the second gathering portion 221b, for example, it is convenient for the multiple pole tabs 221 to form a plate structure with a certain rigidity, thereby facilitating the direct or indirect electrical connection of the second gathering portion 221b with the pole 5, and facilitating subsequent operations.

[0080] Obviously, in the above technical solution, the multiple tabs 221 are merely brought together but not connected when forming the first gathered portion 221a and the second gathered portion 221b. The second gathered portion 221b is then pre-connected to form the multiple tabs 221 into an integrated structure. For example, the second gathered portion 221b can be pre-connected by welding (e.g., ultrasonic welding) to form an integrated sheet structure; or the second gathered portion 221b can be pre-connected by bonding with a conductive adhesive.

[0081] It should be noted that in the above technical solution, along the extension direction of the electrode tab 221, the first gathering portion 221a and the second gathering portion 221b are arranged in sequence along the direction away from the active material coating portion 21, and the specific positions of the first gathering portion 221a and the second gathering portion 221b are not limited, that is, there is no requirement for how close the first gathering portion 221a is to the active material coating portion 21, nor is there a requirement for how far the second gathering portion 221b is from the active material coating portion 21.

[0082] In an embodiment of the present application, the pole tab 221 can be divided into a positive pole tab 221 and a negative pole tab 221. The positive pole tabs 221 of multiple battery cell assemblies 2 are gathered and stacked together, and the second gathered portions 221b formed by the multiple positive pole tabs 221 are pre-connected; similarly, the negative pole tabs 221 of multiple battery cell assemblies 2 are gathered and stacked together, and the second gathered portions 221b formed by the multiple negative pole tabs 221 are pre-connected.

[0083] It can be understood that in the embodiment of the present application, the multiple tabs 221 of the conductive parts 22 of the multiple battery cell assemblies 2 are gathered together, and the above operation is still performed when the multiple battery cell assemblies 2 are stacked along the second direction, so that during the above assembly process of the battery single unit 10, there is no need to adjust the placement posture of the multiple battery cell assemblies 2, thereby simplifying the assembly process.

[0084] In some embodiments of the present application, when there are two battery cell assemblies 2, the tabs 221 of the two battery cell assemblies 2 can be folded together, and the folding position is located at the center position between the two battery cell assemblies 2 to form a symmetrical folding form (for example, as shown in Figures 1 and 11. Alternatively, in some other embodiments, when the tabs 221 of the two battery cell assemblies 2 are folded together, the folding position can also be biased towards one of the battery cell assemblies 2 to form an asymmetrical folding form (for example, as shown in Figures 12(a) and 12(b)). At this time, in the first direction, the projection of the folding position can be located within the projected outer contour range of the tabs 221 of the two battery cell assemblies 2 (as shown in Figure 12(a)), or, in the first direction, the projection of the folding position can be located outside the projected outer contour range of the tabs 221 of the two battery cell assemblies 2 (as shown in Figure 12(b)).

[0085] Please refer to Figures 4 and 11. In the first embodiment, after the second gathering portion 221b is pre-connected and before the multiple battery cell assemblies 2 are placed in the shell body 1, the assembly method further includes: passing the second gathering portion 221b through the avoidance hole 30 on the bracket 3, so that at least a portion of the second gathering portion 221b extends to the side of the bracket 3 away from the active material coating portion 21, and the bracket 3 is covered on the outer peripheral side of the multiple battery cell assemblies 2, so that the multiple battery cell assemblies 2 are wrapped as a whole by the bracket 3.

[0086] In the above technical solution, by setting the bracket 3, the second retracted portion 221b extends to the side of the bracket 3 away from the active material coating portion 21 through the avoidance hole 30, so that the setting of the bracket 3 will not affect the electrical connection between the second retracted portion 221b and the corresponding pole 5. At the same time, the bracket 3 can be covered on the outer peripheral wall of the multiple active material coating portions 21 to play a certain limiting role on the multiple active material coating portions 21. For example, the bracket 3 can limit the relative movement of the multiple battery cell components 2 in the second direction and the third direction to a certain extent, so that the multiple battery cell components 2 are limited by the bracket 3. It is made into a whole, which is convenient for the subsequent shell insertion operation; at the same time, the avoidance hole 30 on the bracket 3 can, to a certain extent, have a certain limiting effect on the second retracted portion 221b, so as to improve the stability of the second retracted portion 221b and the first retracted portion 221a in maintaining their retracted state, and play a certain supporting and shaping role on the conductive portion 22, thereby reducing the risk of cracking of the first retracted portion 221a and the second retracted portion 221b, and can separate the active material coating portion 21 from the shell body 1, thereby reducing the risk of short-circuiting between the conductive portion 22 and the active material coating portion 21, and improving the reliability of the battery cell 10.

[0087] It can be seen that after the multiple battery cell assemblies 2 are assembled with the bracket 3, the assembled multiple battery cell assemblies 2 and the bracket 3 are placed together in the shell body 1 so that the bracket 3 can be accommodated in the shell body 1. At this time, the bracket 3 can be located on the side of the active material coating part 21 close to the corresponding pole 5, and the part of the second retracted part 221b extending to the side of the bracket 3 away from the active material coating part 21 is convenient for subsequent electrical connection with the corresponding pole 5, so as to realize normal charging and discharging of the battery cell 10; then in the subsequent shell insertion operation process, the bracket 3 can enter the shell body 1 before the active material coating part 21, and the bracket 3 can play a certain protective role on the active material coating part 21, thereby reducing the risk of the shell body 1 scratching the active material coating part 21. Among them, the part of the second retracted portion 221b extending to the side of the bracket 3 away from the active material coating portion 21 can be directly electrically connected to the corresponding pole 5, or the part of the second retracted portion 221b extending to the side of the bracket 3 away from the active material coating portion 21 can be first fixed to the adapter plate, and then the adapter plate is electrically connected to the corresponding pole 5, so as to realize indirect electrical connection between the second retracted portion 221b and the corresponding pole 5.

[0088] Exemplarily, the bracket 3 may include a main body 31 and a limiting portion 32, the limiting portion 32 is provided at the edge of the main body 31 and extends from the main body 31 along the first direction, so that a matching groove is formed on one side of the bracket 3 in the first direction, and the avoidance hole 30 is formed on the main body 31. When the multiple battery cell assemblies 2 are assembled with the bracket 3, the side of the bracket 3 with the matching groove is arranged toward the multiple battery cell assemblies 2, and the second retracting portion 221b is passed through the avoidance hole 30, and the bracket 3 and the multiple battery cell assemblies 2 are approached along the first direction until the multiple battery cell assemblies 2 are matched with the matching groove and the limiting portion 32 is located on the outer peripheral side of the active material coating portion 21, so that the limiting portion 32 is in the second direction and the third direction. It plays a limiting role on multiple active material coating parts 21, so as to improve the problem of carbon powder falling off the edge of the active material coating part 21 and overlapping with the shell body 1 to cause corrosion; in addition, the setting of the limiting part 32 can also facilitate the connection between the bracket 3 and the insulating part 4 described later, so that multiple battery cell components 2 can be wrapped by the bracket 3 and the insulating part 4 to improve the insulation effect. Compared with the prior art method of affixing at least 8 insulating tapes on the front and back of the pole ear sheet, the embodiment of the present application can meet the insulation requirements of the battery cell 10 without affixing the pole ear tape. At the same time, during the subsequent shell insertion operation, it is convenient to further reduce the risk of the battery cell component 2 being scratched by the shell body 1, thereby improving the reliability of the battery cell 10.

[0089] Among them, the limiting portion 32 is connected to the main body portion 31, and the limiting portion 32 can be extended from the entire circumferential edge of the main body portion 31 to form a ring-shaped extension structure, or can be extended from a part of the circumferential edge of the main body portion 31 to form a block structure protruding relative to the main body portion 31; taking the limiting portion 32 formed as a ring structure as an example, the limiting portion 32 can include two first limiting sub-portions arranged opposite to each other along the second direction and two second limiting sub-portions arranged opposite to each other along the third direction, the two first limiting sub-portions are respectively matched with the two sides of the multiple active material coating portions 21 in the second direction to limit the relative movement of the multiple active material coating portions 21 in the second direction, and the two second limiting sub-portions are respectively matched with the two sides of the multiple active material coating portions 21 in the third direction to limit the relative movement of the multiple active material coating portions 21 in the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0090] In other embodiments of the present application, the battery cell 10 may not include the bracket 3. In this case, when the multiple battery cell assemblies 2 are placed in the shell, the bracket 3 is not placed in the shell body 1.

[0091] Please refer to Figure 5. In the second embodiment, the conductive part 22 also includes an adapter. After the second gathering part 221b is pre-connected and before the multiple battery cell assemblies 2 are placed in the shell body 1, the assembly method also includes: fixing the adapter to the second gathering part 221b, and passing the adapter and the second gathering part 221b through the avoidance hole 30 on the bracket 3, so that at least part of the second gathering part 221b and the adapter extend to the side of the bracket 3 away from the active material coating part 21, and the bracket 3 is covered on the outer peripheral side of the multiple battery cell assemblies 2, so that the multiple battery cell assemblies 2 are wrapped as a whole by the bracket 3.

[0092] In the above technical solution, by setting the bracket 3, the adapter plate and the second retracted portion 221b extend to the side of the bracket 3 away from the active material coating portion 21 through the avoidance hole 30, so that the setting of the bracket 3 will not affect the electrical connection between the adapter plate and the corresponding pole 5. At the same time, the bracket 3 can be covered on the outer peripheral wall of the multiple active material coating portions 21 to play a certain limiting role on the multiple active material coating portions 21. For example, the bracket 3 can limit the relative movement of the multiple battery cell assemblies 2 in the second direction and the third direction to a certain extent, so that the multiple battery cell assemblies 2 are restricted by the bracket 3. It is a whole, which is convenient for subsequent shell insertion operations; at the same time, the avoidance hole 30 on the bracket 3 can, to a certain extent, have a certain limiting effect on the second retracted portion 221b, so as to improve the stability of the second retracted portion 221b and the first retracted portion 221a in maintaining their retracted state, and play a certain supporting and shaping role on the conductive portion 22, thereby reducing the risk of cracking of the first retracted portion 221a and the second retracted portion 221b, and can separate the active material coating portion 21 from the shell body 1, thereby reducing the risk of short-circuiting between the conductive portion 22 and the active material coating portion 21, and improving the reliability of the battery cell 10.

[0093] It can be seen that after the adapter is fixedly connected to the second retracted portion 221b and multiple battery cell assemblies 2 are assembled with the bracket 3, they are placed together in the shell body 1 so that the bracket 3 can be accommodated in the shell body 1. The adapter can be accommodated in the shell body 1, or the adapter can be exposed through the hole on the shell body 1. At this time, the bracket 3 can be located on the side of the active material coating portion 21 close to the corresponding pole 5, and the adapter can subsequently be electrically connected to the corresponding pole 5 to achieve normal charging and discharging of the battery cell 10.

[0094] In some examples, the structure of the bracket 3 in the second embodiment of the present application may be the same as the structure of the bracket 3 in the first embodiment, and will not be described in detail here.

[0095] Please refer to Figure 6. In the third embodiment, the conductive part 22 also includes an adapter. After the second gathering part 221b is pre-connected and before the multiple battery cell assemblies 2 are placed in the shell body 1, the assembly method also includes: passing the second gathering part 221b through the avoidance hole 30 on the bracket 3, so that at least part of the second gathering part 221b extends to the side of the bracket 3 away from the active material coating part 21, and the bracket 3 is covered on the outer peripheral side of the multiple battery cell assemblies 2, so that the multiple battery cell assemblies 2 are wrapped as a whole by the bracket 3, and the adapter is fixed to the above-mentioned at least part of the second gathering part 221b, and the adapter is located on the side of the bracket 3 away from the active material coating part 21.

[0096] In the above technical solution, by setting the bracket 3, the second retracted portion 221b extends to the side of the bracket 3 away from the active material coating portion 21 through the avoidance hole 30, so that the setting of the bracket 3 will not affect the subsequent electrical connection between the second retracted portion 221b and the adapter. At the same time, the bracket 3 can be covered on the outer peripheral wall of the multiple active material coating portions 21 to play a certain limiting role on the multiple active material coating portions 21. For example, the bracket 3 can limit the relative movement of the multiple battery cell components 2 in the second direction and the third direction to a certain extent, so that the multiple battery cell components 2 are limited by the bracket 3. It is made into a whole, which is convenient for the subsequent shell insertion operation; at the same time, the avoidance hole 30 on the bracket 3 can, to a certain extent, have a certain limiting effect on the second retracted portion 221b, so as to improve the stability of the second retracted portion 221b and the first retracted portion 221a in maintaining their retracted state, and play a certain supporting and shaping role on the conductive portion 22, thereby reducing the risk of cracking of the first retracted portion 221a and the second retracted portion 221b, and can separate the active material coating portion 21 from the shell body 1, thereby reducing the risk of short-circuiting between the conductive portion 22 and the active material coating portion 21, and improving the reliability of the battery cell 10.

[0097] It can be seen that after assembling multiple battery cell assemblies 2 and the bracket 3, the part of the second retracted portion 221b extending to the side of the bracket 3 away from the active material coating portion 21 is fixed to the adapter piece, and both are placed together in the shell body 1 so that the bracket 3 can be accommodated in the shell body 1. The adapter piece can be accommodated in the shell body 1, or the adapter piece can be exposed through the hole on the shell body 1. At this time, the bracket 3 can be located on the side of the active material coating portion 21 close to the corresponding pole 5, and the adapter piece can subsequently be electrically connected to the corresponding pole 5 to achieve normal charging and discharging of the battery cell 10.

[0098] In some examples, the structure of the bracket 3 in the third embodiment of the present application may be the same as the structure of the bracket 3 in the first embodiment, and will not be repeated here.

[0099] Please refer to Figures 7 and 11. In some embodiments of the present application, before placing the multiple battery cell assemblies 2 into the shell body 1, the assembly method further includes: wrapping the insulating member 4 outside the active material coating portion 21 and connecting the insulating member 4 to the bracket 3.

[0100] In the above technical solution, on the one hand, by wrapping the insulating part 4 outside the active material coating part 21, the insulation reliability between the active material coating part 21 and the shell body 1 can be improved, the corrosion of the shell body 1 caused by the contact between the active material coating part 21 and the shell body 1 can be reduced or prevented, and the leakage of electrolyte caused by the corrosion of the shell body 1 can be reduced, thereby improving the reliability of the battery cell 10; on the other hand, by connecting the insulating part 4 to the bracket 3, the difficulty of fixing the insulating part 4 can be reduced, and the reliability of the insulating part 4 wrapped outside the active material coating part 21 can be improved; on the other hand, the insulating part 4 and the bracket 3 can basically wrap a plurality of battery cell components 2, and during the subsequent shell insertion operation, the risk of the battery cell components 2 being scratched by the shell body 1 can be further reduced, thereby improving the reliability of the battery cell 10.

[0101] It can be seen that the bracket 3 and the insulating member 4 can together cover the outer surface of the battery cell assembly 2 to reduce the risk of the battery cell assembly 2 being damaged.

[0102] It can be understood that the operations of wrapping the insulating part 4 and connecting the insulating part 4 to the bracket 3 in the above technical solution can be respectively applicable to the first embodiment, the second embodiment and the third embodiment described above in this application.

[0103] Exemplarily, the insulating member 4 is an insulating film such as a mylar film, and the insulating member 4 is welded and fixed to the bracket 3; the bracket 3 may include a main body 31 and a limiting portion 32, the limiting portion 32 cooperates with the outer peripheral wall of the multiple active material coating portions 21, and the insulating member 4 can be welded and fixed to the limiting portion 32.

[0104] Please refer to Figure 8. In some embodiments of the present application, after placing multiple battery cell assemblies 2 into the shell body 1, the assembly method further includes: fixing the shell cover 6 to the open end of the shell body 1 so that the shell cover 6 closes the open end of the shell body 1; and fixing the conductive part 22 to the pole 5.

[0105] In the above technical solution, the shell cover 6 is fixedly arranged on the open end of the shell body 1 to enclose the multiple battery cell assemblies 2 in the accommodating cavity defined by the shell body 1 and the shell cover 6, thereby realizing reliable packaging of the multiple battery cell assemblies 2; and the conductive part 22 is fixedly connected to the pole 5 to realize electrical connection between the conductive part 22 and the pole 5, so as to realize normal charging and discharging of the battery cell 10.

[0106] It can be understood that, for the above-mentioned first embodiment, when the conductive part 22 is fixedly connected to the pole 5, the part of the second retracted part 221b extending to the side of the bracket 3 away from the active material coating part 21 is fixedly connected to the pole 5; for the above-mentioned second and third embodiments, the adapter plate is fixedly connected to the pole 5.

[0107] It should be noted that there is no specific restriction on the order of “fixing the shell cover 6 to the open end of the shell body 1 so that the shell cover 6 closes the open end of the shell body 1” and “fixing the conductive part 22 to the pole 5 to achieve electrical connection between the conductive part 22 and the pole 5”. For example, after placing multiple battery cell assemblies 2 into the shell body 1, the shell cover 6 can be fixed to the open end of the shell body 1 first, and then the conductive part 22 can be fixed to the pole 5, or the conductive part 22 can be fixed to the pole 5 first, and then the shell cover 6 can be fixed to the open end of the shell body 1.

[0108] In addition, in the embodiment of the present application, there is no specific limitation on the connection method between the shell cover 6 and the shell body 1, and the connection method between the conductive part 22 and the pole 5; for example, the shell cover 6 and the shell body 1 are welded and fixed, and the conductive part 22 and the pole 5 are welded and fixed.

[0109] Referring to Figure 9 , in some embodiments of the present application, the terminal 5 is formed with a receiving groove 50. The notch of the receiving groove 50 is formed on the surface of the terminal 5 away from the battery cell assembly 2. The receiving groove 50 can be open in a direction away from the active material coating portion 21. A through-hole 50a is formed on the wall of the receiving groove 50 adjacent to the battery cell assembly 2. That is, the through-hole 50a is formed on the wall of the receiving groove 50 away from the notch. The assembly method further includes: assembling and fixing the terminal 5 to the housing 1; and inserting the conductive portion 22 through the through-hole 50a.

[0110] In the above technical solution, the pole 5 can be first assembled and fixed to the shell body 1, and then the conductive part 22 can be passed through the through-hole 50a, so as to facilitate the assembly of the shell body 1, the pole 5 and the battery cell assembly 2, thereby improving the assembly efficiency; moreover, after the conductive part 22 is passed through the through-hole 50a, the conductive part 22 is fixed to the pole 5, so that a part of the conductive part 22 can be accommodated in the accommodating groove 50. The setting of the accommodating groove 50 can, on the one hand, reduce the weight of the pole 5, which is conducive to improving the weight energy density of the battery cell 10, and on the other hand, it can accommodate a part of the conductive part 22, so as to facilitate the storage and arrangement of the conductive part 22 through the notch of the accommodating groove 50, and facilitate the operation of fixing the conductive part 22 to the pole 5 through the notch of the accommodating groove 50, thereby reducing the difficulty of assembly.

[0111] For example, the terminal 5 may include an end wall and a side wall. The end wall is located on the side of the side wall near the active material coating portion 21. The end wall and the side wall enclose a receiving groove 50, and a through-hole 50a is provided in the end wall. In this case, the portion of the conductive portion 22 received in the receiving groove 50 can be fixedly connected to the terminal 5. In this case, the portion of the conductive portion 22 can be fixed to the end wall and / or the side wall; alternatively, the portion of the conductive portion 22 received in the through-hole 50a can be fixedly connected to the terminal 5.

[0112] It should be noted that the order of "securing the electrode 5 to the housing 1" and "inserting the plurality of battery cell assemblies 2 into the housing 1" is not specifically limited. For example, if the electrode 5 is secured to the housing 1 after the plurality of battery cell assemblies 2 are inserted into the housing 1, then the order of "assembling and securing the electrode 5 to the housing 1" and "securing the housing cover 6 to the open end of the housing 1" is not specifically limited. "Assembling and securing the electrode 5 to the housing 1" can precede "securingly connecting the conductive portion 22 to the electrode 5"; alternatively, the electrode 5 can be secured to the housing 1 first, followed by the insertion of the plurality of battery cell assemblies 2 into the housing 1.

[0113] In the embodiments of the present application, there is no specific limitation on the method for fixing the terminal 5 to the housing 1. For example, the terminal 5 and the housing 1 may be fixed by riveting. In this case, the terminal 5 has a first flange portion and a second flange portion, with the first flange portion being positionally engaged with the outer side of the housing 1 and the second flange portion being positionally engaged with the inner side of the housing 1. In this case, the terminal 5 and the housing 1 are first fixed, and then the multiple battery cell assemblies 2 are placed into the housing 1. Of course, the terminal 5 and the housing 1 can also be fixed by welding.

[0114] Similarly, "inserting the conductive portion 22 through the through-hole 50a" may precede "fixing the conductive portion 22 to the pole 5", and the order of "inserting the conductive portion 22 through the through-hole 50a" and "inserting the plurality of battery cell assemblies 2 into the shell body 1" is not specifically limited, and the order of "inserting the conductive portion 22 through the through-hole 50a" and "fixing the shell cover 6 to the open end of the shell body 1" is not specifically limited. For example, after the plurality of battery cell assemblies 2 are placed into the shell body 1, the conductive portion 22 is inserted into the through-hole 50a. At this time, the assembly method may include first placing the plurality of battery cell assemblies 2 into the shell body 1, then assembling and fixing the pole 5 to the shell body 1, and then inserting the conductive portion 22 into the through-hole 50a; or the assembly method may include first assembling and fixing the pole 5 to the shell body 1, then placing the plurality of battery cell assemblies 2 into the shell body 1, and then inserting the conductive portion 22 into the through-hole 50a; or first inserting the conductive portion 22 into the through-hole 50a, Then, multiple battery cell assemblies 2 are placed into the shell body 1. At this time, the assembly method may include first assembling and fixing the pole 5 to the shell body 1, passing the conductive portion 22 through the through-hole 50a, and then placing the multiple battery cell assemblies 2 into the shell body 1; or during the process of placing the multiple battery cell assemblies 2 into the shell body 1, passing the conductive portion 22 through the through-hole 50a. At this time, the assembly method may include first assembling and fixing the pole 5 to the shell body 1, and then passing the conductive portion 22 through the through-hole 50a during the process of placing the multiple battery cell assemblies 2 into the shell body 1.

[0115] In addition, there is no specific restriction on the order of “fixing the housing cover 6 to the open end of the housing body 1 ” and all the operation steps after “placing the plurality of battery cell assemblies 2 into the housing body 1 ”.

[0116] Of course, in other embodiments of the present application, the notch of the accommodating groove 50 can also be formed on the side surface of the pole 5 facing the battery cell assembly 2. In this case, there is no need to open the through hole 50a on the pole 5 to achieve the fixation of the conductive part 22 and the pole 5; for example, a part of the conductive part 22 is overlapped on the side of the pole 5 facing the battery cell assembly 2, and the above-mentioned part of the conductive part 22 is welded and fixed to the pole 5.

[0117] Please refer to Figures 10 and 11. In some embodiments of the present application, after the conductive part 22 is fixedly connected to the pole 5, the assembly method further includes: fixing the cover plate 7 at the notch of the accommodating groove 50 so that the cover plate 7 closes the notch of the accommodating groove 50.

[0118] In the above technical solution, by sealing the notch of the receiving tank 50 with the cover plate 7, the electrolyte in the shell body 1 can be prevented from leaking from the notch of the receiving tank 50; moreover, when the cover plate 7 is electrically connected to the pole 5, the cover plate 7 can be used to facilitate indirect electrical connection between the pole 5 and the busbar component, which is beneficial to increase the connection area of ​​the electrical connection position and reduce the resistance at the electrical connection position.

[0119] In the second aspect, an embodiment of the present application provides an assembly device 100, as shown in Figure 13, the assembly device 100 is used to assemble a battery cell 10, the battery cell 10 includes a shell body 1 and multiple battery cell assemblies 2 accommodated in the shell body 1, the multiple battery cell assemblies 2 are connected in series and / or in parallel, then the multiple battery cell assemblies 2 of the battery cell 10 can be connected in series, in parallel or in mixed connection, mixed connection means that the multiple battery cell assemblies 2 are both in series and in parallel; each battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22, the active material coating portion 21 is the portion of the battery cell assembly 2 coated with active material, which can assist in the deintercalation of metal ions during the charging and discharging process of the battery cell 10, the conductive portion 22 is located at one end of the battery cell assembly 2 in the first direction, and the conductive portion 22 is used to electrically connect the active material coating portion 21 and the pole 5 of the battery cell 10, then the conductive portion 22 can be a structure that electrically connects the active material coating portion 21 and the pole 5, which is not coated with active material.

[0120] The assembly device 100 includes a stacking tool 101 and a first fixing tool 102. The stacking tool 101 is used to stack multiple battery cell assemblies 2 along a second direction perpendicular to the first direction. The first fixing tool 102 is used to fix the conductive portions 22 of the multiple battery cell assemblies 2 to ensure electrical connection. The assembly device 100 also includes a shell insertion tool 103, which is used to insert the multiple battery cell assemblies 2 into the shell body 1.

[0121] In the above technical solution, a plurality of battery cell assemblies 2 are stacked along the second direction by setting a stacking tool 101 to reduce the occupied area of ​​the plurality of battery cell assemblies 2 during subsequent transportation, operation, etc., and when the second direction is the up-down direction, the battery cell assembly 2 at the bottom of the plurality of battery cell assemblies 2 is in contact with the logistics line, so as to reduce the risk of relative movement between the plurality of battery cell assemblies 2, so that after the conductive parts 22 of the plurality of battery cell assemblies 2 are electrically connected and the plurality of battery cell assemblies 2 are transported on the logistics line, the risk of the conductive parts 22 of the plurality of battery cell assemblies 2 being pulled can be effectively reduced, thereby reducing the risk of the conductive parts 22 of the plurality of battery cell assemblies 2 being pulled. 2 cracking risk, thereby improving the reliability of multiple battery cell assemblies 2; moreover, during the electrical connection and shell insertion operations of the multiple battery cell assemblies 2, the multiple battery cell assemblies 2 are kept in a stacked state along the second direction for corresponding operations, so that the relative postures of the multiple battery cell assemblies 2 before and after being placed in the shell body 1 are consistent, so that during the assembly process of the battery cell 10, the assembly device 100 does not need to adjust the relative placement postures of the multiple battery cell assemblies 2 before and after being placed in the shell, so as to simplify the structure of the assembly device 100 and the assembly process of the battery cell 10.

[0122] For example, the shell insertion tool 103 moves multiple battery cell assemblies 2 stacked along the second direction and the shell body 1 relatively close to each other along the second direction, so that multiple battery cell assemblies 2 enter the shell body 1 through the open end of the shell body 1 until the battery cell assemblies 2 are completely inserted into the shell.

[0123] In some examples, the assembly device 100 in the embodiments of the present application may use the assembly method in the above-mentioned embodiments of the present application to assemble the battery cells 10 .

[0124] Please refer to Figure 13. In some embodiments of the present application, the assembly device 100 also includes a folding tool 104 and a second fixing tool 107. The folding tool 104 is used to fold the conductive parts 22 (for example, the tabs 221) of multiple battery cell assemblies 2, so that the conductive parts 22 of the multiple battery cell assemblies 2 are close to the active material coating part 21 to form a first folding part 221a, and the conductive parts 22 of the multiple battery cell assemblies 2 are away from the active material coating part 21 to form a second folding part 221b. The first fixing tool 102 is used to pre-connect the second folding part 221b.

[0125] In the above technical solution, a gathering tool 104 is provided to gather the conductive parts 22 of multiple battery cell assemblies 2 to form a first gathering part 221a and a second gathering part 221b, so as to realize the shaping of the multiple conductive parts 22. Subsequently, corresponding operations are performed on the first gathering part 221a and the second gathering part 221b to realize corresponding operations on the multiple conductive parts 22, which is beneficial to improving assembly efficiency; at the same time, the second gathering part 221b is pre-connected by the first fixing tool 102, so that the second gathering part 221b is formed into a whole, so as to reduce the interlayer gap of the multiple pole tabs 221 in the second gathering part 221b, for example, it is convenient for the multiple pole tabs 221 to form a plate structure with a certain rigidity, thereby facilitating the direct or indirect electrical connection of the second gathering part 221b with the pole 5, and facilitating subsequent operations.

[0126] Please refer to Figure 13. In some embodiments of the present application, the assembly device 100 also includes an auxiliary tooling 105, which is suitable for being detachably connected to the second retracting portion 221b, and the auxiliary tooling 105 is used to drive the second retracting portion 221b to pass through the avoidance hole 30 on the bracket 3, so that at least part of the second retracting portion 221b extends to the side of the bracket 3 away from the active material coating portion 21.

[0127] Exemplarily, after the first fixing tool 102 pre-connects the second gathering part 221b, the auxiliary tool 105 is connected to the second gathering part 221b. The auxiliary tool 105 can pass through the avoidance hole 30 from the side of the bracket 3 facing the active material coating part 21 to the side of the bracket 3 away from the active material coating part 21, and continue to drive the second gathering part 221b to pass through the avoidance hole 30 until at least part of the second gathering part 221b extends through the avoidance hole 30 to the side of the bracket 3 away from the active material coating part 21, and then the auxiliary tool 105 and the second gathering part 221b are separated.

[0128] In the above technical solution, an auxiliary tooling 105 is provided to drive the second retracting portion 221b to pass through the avoidance hole 30 on the bracket 3, so as to facilitate the assembly of the second retracting portion 221b and the bracket 3, and facilitate the assembly of the active substance coating portion 21 and the bracket 3, and the auxiliary tooling 105 is detachably connected to the second retracting portion 221b. After completing the corresponding operation, the auxiliary tooling 105 can be disassembled from the second retracting portion 221b without affecting subsequent operations.

[0129] In the embodiment of the present application, there is no specific limitation on the detachable manner between the auxiliary tooling 105 and the second gathering portion 221b.

[0130] In some embodiments, the assembly device 100 further includes an assembly tool, which is used to assemble the bracket 3 and the active material coating portion 21 so that the bracket 3 is covered on the outer periphery of the plurality of active material coating portions 21 .

[0131] Please refer to Figure 13. In some embodiments of the present application, the assembly device 100 also includes a covering tool 106 and a second fixing tool 107. The covering tool 106 is used to cover the insulating part 4 outside the active material coating part 21, and the second fixing tool 107 is used to fix the insulating part 4 to the bracket 3.

[0132] In the above technical solution, a wrapping tool 106 is provided to wrap the insulating part 4 around the active material coating portion 21, and a second fixing tool 107 is used to fix the insulating part 4 to the bracket 3, so as to improve the wrapping reliability of the insulating part 4 and the insulation performance between the multiple battery cell assemblies 2 and the shell body 1, thereby improving the reliability of the battery single body 10; moreover, the insulating part 4 and the bracket 3 can provide a certain degree of protection for the multiple battery cell assemblies 2, thereby reducing the risk of the multiple battery cell assemblies 2 being scratched by the shell body 1 during the process of inserting the multiple battery cell assemblies 2 into the shell.

[0133] It is understood that in the embodiment of the present application, if the battery cell 10 includes a bracket 3, the shell insertion tool 103 is used to place the assembled multiple battery cell assemblies 2 and the bracket 3 together into the shell body 1. Furthermore, the shell insertion tool 103 is used to place the assembled multiple battery cell assemblies 2, the bracket 3, and the insulating member 4 together into the shell body 1. If the battery cell 10 does not include a bracket 3, the shell insertion tool 103 is used to place the assembled multiple battery cell assemblies 2 together into the shell body 1. Furthermore, the insulating member 4 is not fixed to the bracket 3, and the shell insertion tool 103 is used to place the assembled multiple battery cell assemblies 2 and the insulating member 4 together into the shell body 1.

[0134] In some examples, the second fixing fixture 107 and the first fixing fixture 102 are integrated into one fixture; or the second fixing fixture 107 and the first fixing fixture 102 are constructed as two separately provided fixtures.

[0135] Please refer to Figure 13. In some embodiments of the present application, the assembly device 100 also includes a third fixing fixture 108 and a fourth fixing fixture 109. The third fixing fixture 108 is used to fix the shell cover 6 to the open end of the shell body 1, and the third fixing fixture 108 is used to fix the conductive part 22 to the pole 5. The fourth fixing fixture 109 is used to assemble and fix the pole 5 to the shell body 1.

[0136] In the above technical solution, the shell cover 6 is fixed to the shell body 1 and the open end of the shell body 1 is closed by setting a third tool, so that the multiple battery cell assemblies 2 are enclosed in the accommodating cavity defined by the shell body 1 and the shell cover 6, thereby realizing reliable packaging of the multiple battery cell assemblies 2, and the third fixing tool 108 can fix the conductive part 22 to the pole 5 to realize the electrical connection between the conductive part 22 and the pole 5, so as to realize normal charging and discharging of the battery cell 10; the pole 5 is fixed to the shell body 1 by setting the fourth fixing tool 109 to realize the assembly of the pole 5 and the shell body 1.

[0137] In some examples, at least two of the first fixture 102 , the second fixture 107 , the third fixture 108 , and the fourth fixture 109 may be integrated into one fixture; or the first fixture 102 , the second fixture 107 , the third fixture 108 , and the fourth fixture 109 may be configured as four separately disposed fixtures.

[0138] Referring to Figure 13 , in some embodiments of the present application, the terminal 5 is formed with a receiving groove 50. The notch of the receiving groove 50 is formed on the side surface of the terminal 5 away from the battery cell assembly 2. A through-hole 50a is formed on the wall of the receiving groove 50 adjacent to the battery cell assembly 2. The assembly device 100 also includes a fifth fixing fixture 110, which is used to fix the cover plate 7 to the notch of the receiving groove 50.

[0139] In the above technical solution, the cover plate 7 is fixed to the notch of the receiving tank 50 by setting the fifth fixing tool 110, so that the cover plate 7 is fixed to the pole 5, so that the cover plate 7 closes the notch of the receiving tank 50, thereby preventing the electrolyte in the shell body 1 from leaking from the notch of the receiving tank 50.

[0140] In some examples, any one of the first fixing tool 102 , the second fixing tool 107 , the third fixing tool 108 , the fourth fixing tool 109 and the fifth fixing tool 110 in the embodiment of the present application may be a welding tool (eg, an ultrasonic welding tool).

[0141] In some examples, at least two of the first fixing fixture 102, the second fixing fixture 107, the third fixing fixture 108, the fourth fixing fixture 109, and the fifth fixing fixture 110 can be integrated into one fixture; or the first fixing fixture 102, the second fixing fixture 107, the third fixing fixture 108, the fourth fixing fixture 109, and the fifth fixing fixture 110 are respectively constructed as five separately set fixtures.

[0142] Please refer to FIG. 7 , FIG. 10 and FIG. 11 again to describe the assembly method of the battery cell 10 according to a specific embodiment of the present application.

[0143] In the embodiment of the present application, the battery cell 10 includes a shell 1, two battery cell assemblies 2, a bracket 3, an insulating member 4, a pole 5, a shell cover 6 and a cover plate 7. For a single battery cell assembly 2, the battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The conductive portion 22 is provided at one end of the active material coating portion 21 in the first direction, and the two side walls of the battery cell assembly 2 in the second direction are respectively the first side walls 20. The first side wall 20 is the side wall with the largest area among the multiple side walls of the battery cell assembly 2; wherein the first direction is the first horizontal direction, the second direction is the vertical direction, and the third direction is the second horizontal direction, and the first horizontal direction is perpendicular to the second horizontal direction. The assembly method of the battery cell 10 includes:

[0144] S1. Stack two battery cell assemblies 2 along a second direction perpendicular to the first direction, wherein one first side wall 20 of one battery cell assembly 2 is arranged opposite to one first side wall 20 of the other battery cell assembly 2 along the second direction, and the other first side wall 20 of one battery cell assembly 2 is arranged back to back to the other first side wall 20 of the other battery cell assembly 2 along the second direction;

[0145] S2. Electrically connecting the conductive portions 22 of the two battery cell assemblies 2, including: converging the plurality of tabs 221 of the conductive portions 22 of the two battery cell assemblies 2, so that the plurality of tabs 221 converge at positions close to the active material coating portion 21 to form a first gathered portion 221a, and the plurality of tabs 221 converge at positions away from the active material coating portion 21 to form a second gathered portion 221b, and pre-connecting the second gathered portion 221b;

[0146] S3. Insert the second gathering portion 221b through the avoidance hole 30 on the bracket 3 along the first direction, so that at least a portion of the second gathering portion 221b extends to a side of the bracket 3 away from the active material coating portion 21 in the first direction, and cover the bracket 3 on both sides of the two battery cell assemblies 2 in the second direction and on both sides of the two battery cell assemblies 2 in the third direction;

[0147] S4, wrapping the insulating member 4 outside the active material coating portion 21, and connecting the insulating member 4 to the bracket 3;

[0148] S5. Place multiple battery cell assemblies 2 into the housing 1. At this point, the housing 1 and the pole 5 have been assembled and fixed, and the conductive portion 22 passes through the through hole 50a on the pole 5.

[0149] S6. Fix the shell cover 6 to the open end of the shell body 1 so that the shell cover 6 closes the open end of the shell body 1, fix the conductive part 22 to the pole 5, and fix the cover plate 7 to the notch of the accommodating groove 50 to achieve electrical connection between the cover plate 7 and the pole 5. In step S6, the order of fixing the shell cover 6 to the shell body 1, fixing the conductive part 22 to the pole 5, and fixing the cover plate 7 to the pole 5 is not specifically limited; in Example 1, the shell cover 6 is first fixedly connected to the shell body 1, then the conductive part 22 is fixed to the pole 5, and then the cover plate 7 is fixed to the pole 5; in Example 2, the conductive part 22 is first fixed to the pole 5, then the cover plate 7 is fixed to the pole 5, and then the shell cover 6 is fixed to the shell body 1; in Example 3, the cover plate 7 is first fixed to the pole 5, then the conductive part 22 is fixed to the pole 5, and then the shell cover 6 is fixed to the shell body 1; in Example 4, the shell cover 6 is first fixedly connected to the shell body 1, then the cover plate 7 is fixed to the pole 5, and the conductive part 22 is fixed to the pole 2.

[0150] In the above technical solution, during the entire assembly process, the two battery cell assemblies 2 always remain in a stacked state along the second direction, which is convenient for reducing the assembly section layout (that is, reducing the space occupied by the assembly section layout to reduce the assembly space required during the assembly process) and improving the wire pulling efficiency; since the postures of the two battery cell assemblies 2 do not need to be adjusted or flipped during the assembly process, the assembly process is simplified and the assembly efficiency is improved. The bracket 3 can play a certain supporting and limiting role on the conductive part 22, which can save the processes of sticking PET film (or polyester film) on the conductive part, welding and gluing, etc.

[0151] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0152] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An assembly method, wherein: Used to assemble a battery cell, the battery cell comprises a shell body and a plurality of battery cell assemblies connected in series and / or in parallel and accommodated in the shell body, each of the battery cell assemblies comprises an active material coating portion and a conductive portion, the conductive portion is located at one end of the battery cell assembly in a first direction and is used to electrically connect the active material coating portion and the pole of the battery cell, The assembly method comprises: Stacking a plurality of the battery cell assemblies along a second direction, wherein the second direction is perpendicular to the first direction; electrically connecting the conductive parts of the plurality of battery cell assemblies; Put a plurality of the battery core components into the shell.

2. The assembly method according to claim 1, wherein: The battery cell assembly has a plurality of side walls, and the first side wall has the largest area among the plurality of side walls. The step of stacking the plurality of battery cell assemblies along the second direction comprises: The first side walls of two adjacent battery core assemblies are arranged back to back and / or opposite to each other along the second direction.

3. The assembly method according to claim 1 or 2, wherein: The electrically connecting the conductive parts of the plurality of battery cell assemblies comprises: The multiple pole tabs of the conductive parts of the multiple battery cell assemblies are gathered together so that the positions of the multiple pole tabs close to the active material coating part are gathered together to form a first gathered part, and the positions of the multiple pole tabs far from the active material coating part are gathered together to form a second gathered part, and the second gathered part is pre-connected.

4. The assembly method according to claim 3, wherein: After pre-connecting the second gathered portion and before placing the plurality of battery cell assemblies into the shell body, the assembly method further includes: The second folded portion is passed through the avoidance hole on the bracket so that at least part of the second folded portion extends to the side of the bracket away from the active material coating portion, and the bracket is covered on the outer peripheral side of the plurality of battery cell assemblies.

5. The assembly method according to claim 3, wherein: The conductive portion further includes a transfer sheet. After the second retracted portion is pre-connected and before the plurality of battery cell assemblies are placed in the shell body, the assembly method further includes: The adapter is fixedly connected to the second gathering part, and the adapter and the second gathering part are passed through the avoidance hole on the bracket, so that at least part of the second gathering part and the adapter extend to the side of the bracket away from the active material coating part, and the bracket is covered on the outer peripheral side of the plurality of battery core assemblies; or, The second folding portion is passed through the avoidance hole on the bracket so that at least part of the second folding portion extends to the side of the bracket away from the active material coating portion, and the bracket is covered on the outer peripheral side of the plurality of battery cell assemblies, and the adapter is fixed to at least part of the second folding portion.

6. The assembly method according to claim 4 or 5, wherein: Before placing the plurality of battery cell assemblies into the shell body, the assembly method further comprises: An insulating member is wrapped around the active material coating portion, and the insulating member is connected to the bracket.

7. The assembly method according to any one of claims 1 to 6, wherein: After placing the plurality of battery cell assemblies into the shell body, the assembly method further comprises: The shell cover is fixedly mounted on the open end of the shell body so that the shell cover closes the open end of the shell body; The conductive part is fixedly connected to the pole.

8. The assembly method according to claim 7, wherein: The pole is formed with a receiving groove, the notch of which is formed on a side surface of the pole away from the battery cell assembly, and a through hole is formed on a groove wall of the receiving groove adjacent to the battery cell assembly. The assembly method comprises: Assembling and fixing the pole and the shell body; The conductive part is inserted into the through hole.

9. The assembly method according to claim 8, wherein: After the conductive part is fixedly connected to the pole, the assembly method further comprises: The cover plate is fixedly arranged at the notch of the containing groove, so that the cover plate closes the notch of the containing groove.

10. An assembly device, wherein: Used to assemble a battery cell, the battery cell comprises a shell body and a plurality of battery cell assemblies connected in series and / or in parallel and accommodated in the shell body, each of the battery cell assemblies comprises an active material coating portion and a conductive portion, the conductive portion is located at one end of the battery cell assembly in a first direction and is used to electrically connect the active material coating portion and the pole of the battery cell, The assembly device comprises: A stacking tool, used for stacking a plurality of the battery cell assemblies along a second direction, wherein the second direction is perpendicular to the first direction; A first fixing tool, used for fixing and connecting the conductive parts of the plurality of battery core assemblies; The shell inserting tool is used to place the plurality of battery core components into the shell body.

11. The assembly device according to claim 10, wherein: Also includes: The gathering tool is used to gather the conductive parts of the multiple battery cell assemblies, so that the conductive parts of the multiple battery cell assemblies are gathered close to the active material coating part to form a first gathering part, and the conductive parts of the multiple battery cell assemblies are gathered away from the active material coating part to form a second gathering part, and the first fixing tool is used to pre-connect the second gathering part.

12. The assembly device according to claim 11, wherein: Also includes: The auxiliary tooling is suitable for being detachably connected to the second folding part and is used to drive the second folding part to pass through the avoidance hole on the bracket, so that at least part of the second folding part extends to the side of the bracket away from the active material coating part.

13. The assembly device according to claim 12, wherein: Also includes: A wrapping tool, used for wrapping the insulating member outside the active material coating portion; The second fixing tool is used to fix the insulating member to the bracket.

14. The assembly device according to any one of claims 10 to 13, wherein: Also includes: A third fixing tool, used for fixing the shell cover to the open end of the shell body, and for fixing the conductive part to the pole; The fourth fixing tool is used to assemble and fix the pole and the shell body.

15. The assembly device according to claim 14, wherein: The pole is formed with a receiving groove, the notch of which is formed on a side surface of the pole away from the battery cell assembly, and a through hole is formed on a groove wall of the receiving groove adjacent to the battery cell assembly. The assembly device also includes: The fifth fixing tool is used to fix the cover plate at the notch of the accommodating groove.

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