Battery welding apparatus and battery welding method

Abstract

Provided in the present application are a battery welding apparatus and a battery welding method. The battery welding apparatus comprises a conveying line, a battery cell feeding device, a connecting piece feeding device and a welding device. The conveying line comprises a plurality of carriers arranged in a conveying direction thereof. The battery cell feeding device comprises at least two battery cell feeding mechanisms, the at least two battery cell feeding mechanisms being respectively used for feeding at least two battery cell groups into at least two target carriers of the conveying line, and each battery cell group comprising at least two battery cells. The connecting piece feeding device is used for feeding connecting pieces into the at least two target carriers. The welding device is arranged beside the conveying line. The conveying line is movably arranged to successively convey the at least two target carriers to the welding device for welding. The welding device is used for welding the connecting piece and the at least two battery cells in each target carrier. The battery welding apparatus of the present application improves the welding efficiency.

Description

Battery welding equipment and battery welding method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410004820.1, filed on January 2, 2024, entitled “Battery Welding Equipment and Battery Welding Method,” the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] As new energy vehicles enter a period of rapid development, the demand for power batteries is also increasing. To meet this demand, the production efficiency of battery production lines needs to be improved. Battery welding equipment is a key piece of equipment on battery production lines, and improving its production efficiency is crucial for increasing battery production. Therefore, improving battery welding efficiency is an urgent issue that needs to be addressed.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery welding device and a battery welding method to improve the welding efficiency of the battery.

[0007] In a first aspect, the present application provides a battery welding device, comprising a conveyor line, a battery cell loading device, a connecting piece loading device and a welding device. The conveyor line includes a plurality of carriers arranged in its conveying direction. The battery cell loading device includes at least two battery cell loading mechanisms, and the at least two battery cell loading mechanisms are respectively used to load at least two battery cell groups into at least two target carriers of the conveyor line, and each battery cell group includes at least two battery cells. The connecting piece loading device is used to load the connecting piece into at least two target carriers. The welding device is arranged beside the conveyor line. The conveyor line is movably arranged to transport at least two target carriers to the welding device in sequence for welding. The welding device is used to weld the connecting piece and at least two battery cells in the target carrier.

[0008] The battery cell loading device of the battery welding equipment of the present embodiment includes at least two battery cell loading mechanisms, which can simultaneously load at least two battery cell groups into at least two target carriers of the conveyor line. The conveyor line can then sequentially transport the at least two target carriers containing at least two battery cell groups to the position of the welding device, thereby allowing at least two battery cell groups to be welded simultaneously by the welding device, thereby improving welding efficiency. In addition, the battery welding equipment of the present embodiment is equipped with multiple carriers on the conveyor line, which increases the buffer capacity and thus improves the fault tolerance of the equipment.

[0009] In some embodiments, the battery welding equipment includes two welding devices spaced apart in the conveying direction of the conveyor line, the two welding devices including a first welding device and a second welding device, the first welding device being used to weld the first pole tabs of at least two battery cells, and the second welding device being used to weld the second pole tabs of at least two battery cells, and the polarities of the first pole tab and the second pole tab are opposite.

[0010] The battery welding equipment of the embodiment of the present application includes two welding devices spaced apart in the conveying direction of the conveyor line. In this way, after the connecting plate and the battery cell group are loaded onto the target carrier, the target carrier is transported forward by the conveyor line and can be welded by the two welding devices in turn, thereby further improving the welding efficiency.

[0011] In some embodiments, the first welding device comprises a brazing device; and / or, the second welding device comprises an aluminum welding device.

[0012] The two welding devices in the embodiment of the present application include a copper welding device and an aluminum welding device. The copper welding device is used to weld the first pole tabs of at least two battery cells, and the aluminum welding device is used to weld the second pole tabs of at least two battery cells. In this way, as long as the target carrier carrying at least two battery cells is transported along the conveyor line, the two pole tabs of at least two battery cells can be connected, thereby improving efficiency.

[0013] In some embodiments, a connecting sheet loading device is used to load two connecting sheets into each target carrier, one of the two connecting sheets is used to connect the first pole tabs of at least two battery cells through a first welding device, and the other of the two connecting sheets is used to connect the second pole tabs of at least two battery cells through a second welding device.

[0014] The connecting piece loading device of the embodiment of the application loads two connecting pieces for each target carrier to respectively connect the positive and negative poles of at least two battery cells, thereby realizing the grouping of at least two battery cells, completing the loading of the connecting pieces at one time, and improving production efficiency.

[0015] In some embodiments, each welding device includes a first welding assembly and a second welding assembly arranged adjacent to each other, and the target carrier passes through the first welding assembly and the second welding assembly in sequence under the conveyance of the conveyor line so that the first and second tabs of at least two battery cells are welded twice respectively.

[0016] In this way, when the target carrier passes through the first welding device under the conveyor line, it will undergo two welding processes of the two welding assemblies in sequence. Specifically, the first tabs and connecting pieces of at least two battery cells will first undergo the first welding process of one welding assembly, and then undergo the second welding process of another welding assembly. In this way, the negative electrode of the battery needs to be welded twice, which improves the welding yield rate and reduces the number of unqualified batteries caused by poor welding. Similarly, when the target carrier passes through the second welding device under the conveyor line, it will also undergo two welding processes of the two welding assemblies in sequence. Specifically, the second tabs and connecting pieces of at least two battery cells will first undergo the first welding process of one welding assembly, and then undergo the second welding process of another welding assembly. In this way, the positive electrode of the battery needs to be welded twice, which improves the welding yield rate and reduces the number of unqualified batteries caused by poor welding.

[0017] In some embodiments, the first welding assembly includes at least two independently arranged welders, and the at least two welders are arranged corresponding to at least two target carriers to respectively weld at least two battery cell groups in at least two target carriers; and / or, the second welding assembly includes at least two independently arranged welders, and the at least two welders are arranged corresponding to at least two target carriers to respectively weld at least two battery cell groups in at least two target carriers.

[0018] The first welding assembly of the embodiment of the present application is provided with at least two welders corresponding to the number of battery cell groups. In this way, after the conveyor line conveys at least two battery cell groups to the welding device, at least two welders can work simultaneously to perform the first welding on at least two battery cell groups at the same time, thereby further improving efficiency.

[0019] In some embodiments, the conveyor line comprises a looped conveyor line.

[0020] The conveyor line of the embodiment of the present application includes a ring conveyor line, so that the target carrier can be docked with multiple devices under the conveyance of the conveyor line. The conveying direction of the conveyor line can be kept consistent. There is no reciprocating motion during the manufacturing process, avoiding the waiting phenomenon caused by untimely completion of the process, thereby greatly improving efficiency.

[0021] In some embodiments, the conveyor line includes a first conveying section and a second conveying section arranged relatively spaced apart and a third conveying section for connecting the first conveying section and the second conveying section. The battery welding equipment includes two welding devices arranged spaced apart in the conveying direction of the conveyor line. The two welding devices are respectively used to weld the first pole tab and the second pole tab of at least two battery cells. One of the two welding devices is arranged next to the first conveying section, and the other of the two welding devices is arranged next to the second conveying section.

[0022] By setting a third conveying section between the first conveying section and the second conveying section, the battery cell group can be directly conveyed to the second conveying section through the third conveying section to be welded by the second welding device after being welded by the first welding device on the first conveying section. This arrangement makes it possible for the welding process of the battery cell group to not require transfer, and it is only necessary to control the conveying action of the conveyor line, and the control process is simple.

[0023] In some embodiments, the conveying line further includes a fourth conveying section arranged opposite to the third conveying section, and the first conveying section, the third conveying section, the second conveying section and the fourth conveying section are sequentially connected to form a closed ring conveying line.

[0024] The conveyor line forms a closed ring conveyor line, so that when the carrier carrying the battery cell group completes welding and unloads, the empty carrier can continue to be transported back to the receiving position along the conveyor line, and then the connecting piece loading device and the battery cell loading device can continue to load materials into the empty carrier, thereby allowing the battery welding equipment of the embodiment of the present application to work continuously and improve work efficiency.

[0025] In some embodiments, the battery welding equipment further includes a cell unloading device, which is connected to the conveyor line to unload the welded cell groups.

[0026] The battery cell unloading device is connected to the conveyor line to unload the welded battery cell group. In this way, the battery welding equipment of the embodiment of the present application can cover the entire process of loading, welding and unloading.

[0027] In some embodiments, the battery welding equipment includes at least two battery cell unloading devices, which are spaced apart in the conveying direction of the conveyor line to unload the welded battery cell groups in at least two target carriers.

[0028] The battery welding equipment of the embodiment of the present application includes at least two target carriers. Therefore, in order to enable the battery cell groups in the at least two target carriers to be unloaded under the conveyance of the conveyor line, the battery welding equipment of the embodiment of the present application is provided with at least two battery cell unloading devices.

[0029] In some embodiments, the connecting sheet loading device includes a connecting sheet conveying device, a connecting sheet storage device, and a grabbing device. The connecting sheet conveying device is used to convey multiple connecting sheets to the connecting sheet storage device, and the grabbing device is used to grab the connecting sheets from the connecting sheet storage device and place them into the target carrier.

[0030] A second aspect of the present application provides a battery welding method based on the above-mentioned battery welding device, comprising the following steps:

[0031] Loading a plurality of connecting pieces into at least two target carriers;

[0032] Loading at least two battery cell groups into at least two target carriers respectively, each battery cell group including at least two battery cells;

[0033] Controlling the conveyor line to sequentially convey at least two target carriers to the welding device; and

[0034] The welding device is controlled to operate to weld the connecting piece and at least two battery cells in the target carrier.

[0035] The battery welding method of the embodiment of the present application loads at least two battery cell groups into at least two target carriers of a conveyor line, and then the conveyor line can sequentially transport at least two target carriers containing at least two battery cell groups to the position of a welding device, so that at least two battery cell groups are sequentially welded by the welding device, thereby improving welding efficiency.

[0036] In some embodiments, the battery welding method also includes detecting whether a battery cell group is placed in the target carrier before controlling the conveyor line to transport at least two target carriers to the welding device. If it is detected that a battery cell group is placed in the target carrier, the conveyor line is controlled to operate; if it is detected that there is no battery cell group in the target carrier, the battery cell loading mechanism is first controlled to load the battery cell group into the target carrier and then the conveyor line is controlled to transport.

[0037] By detecting whether there is a battery cell group placed in the target carrier, it is ensured that the battery cell group and the connecting piece are present in the target carrier transported to the welding device, thereby ensuring smooth welding. This can avoid repeated rework caused by missing cells and improve work efficiency.

[0038] In some embodiments, the battery welding equipment includes a first welding device and a second welding device spaced apart in the conveying direction of the conveyor line, and the conveyor line is controlled to convey at least two target carriers to the welding device for welding. The welding device is used to weld the connecting piece and at least two battery cells in the target carrier, including: controlling the conveyor line to convey at least two target carriers to the first welding device and controlling the first welding device to work to weld the first pole ears of at least two battery cells in the target carrier, and then controlling the conveyor line to convey at least two target carriers to the second welding device and controlling the second welding device to work to weld the second pole ears of at least two battery cells in the target carrier.

[0039] In the battery welding method of the embodiment of the present application, after the connecting piece and the battery cell group are loaded onto the target carrier, the target carrier is transported forward by the conveyor line and can be welded by two welding devices in sequence, thereby further improving the welding efficiency.

[0040] In some embodiments, each welding device includes a first welding assembly and a second welding assembly arranged adjacent to each other, and controlling the welding device to work to weld the connecting piece and at least two battery cells in the target carrier includes: controlling the target carrier conveyor line to convey through the first welding assembly and the second welding assembly in sequence so that the first pole tabs and / or the second pole tabs of at least two battery cells are respectively welded twice.

[0041] The battery welding method of the embodiment of the application performs two welding operations on the first and second tabs of the battery cell group, thereby improving the welding yield and reducing the number of unqualified batteries caused by poor welding.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0044] FIG1 is a schematic structural diagram of a battery welding device according to some embodiments of the present application;

[0045] FIG2 is a schematic diagram of a connecting sheet feeding device according to some embodiments of the present application;

[0046] FIG3 is a schematic diagram of the structure of a battery cell loading device in some embodiments of the present application

[0047] FIG4 is a schematic structural diagram of a welding machine according to some embodiments of the present application;

[0048] FIG5 is a schematic diagram of the steps of a battery welding method according to some embodiments of the present application;

[0049] In the drawings, the drawings are not drawn to scale.

[0050] Marking description: Conveyor line 300, first conveying section 310, second conveying section 320, third conveying section 330, fourth conveying section 340; Connector loading device 100, connector conveying device 1001, connector storage device 1002, gripping device 1003, positioning mechanism 1004, connector loading mechanism 1005; Battery cell loading device 200, first transfer mechanism 2001, transfer clamp 20011, transfer screw 20012, transfer moving mechanism 20013, second transfer mechanism 2002, transfer platform 2003, first battery cell loading mechanism 2004, loading clamp 20041, loading screw 20042, loading moving mechanism 20043, second battery cell loading mechanism 2005; Welding device 400, first welding device 400a, second welding device 400b, first welding assembly 410, Second welding assembly 420, welding machine 411, moving device 4111, first guide rail 41111, second guide rail 41112, supporting base 41113, welding machine body 4112, welding head 41121, telescopic cylinder 41122; battery cell unloading device 600, first battery cell unloading device 600a, second battery cell unloading device 600b; DETAILED DESCRIPTION

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

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

[0054] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0058] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing. To meet this demand, battery production efficiency needs to be improved.

[0059] A battery typically consists of a casing, end caps, and cells housed within the casing. To increase battery capacity, at least two cells are housed within the casing. During battery manufacturing, a connecting tab is connected to the tabs of at least two cells to form a group, which is then assembled into a battery casing.

[0060] In the description of the embodiments of the present application, the battery cell refers to the electrode assembly. The electrode assembly is the component in the battery where the electrochemical reaction occurs. The electrode assembly is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active substances constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active substances each constitute the tabs. During the charge and discharge process of the battery, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the tabs are connected to the poles to form a current loop.

[0061] In the related art, battery welding equipment is usually used to weld the connecting piece and the tabs of at least two battery cells. However, the production capacity of the battery welding equipment in the related art is limited, resulting in low battery welding efficiency.

[0062] Based on this problem, the present application proposes a battery welding device, in which the cell loading device of the battery welding device includes at least two cell loading mechanisms, and the at least two cell loading mechanisms are capable of loading at least two cell groups, thereby improving the processing capacity of the battery welding equipment of the embodiment of the present application and improving the welding efficiency.

[0063] The structure of the battery welding equipment according to the embodiment of the present application and the battery welding method using the battery welding equipment are described in detail below with reference to FIG. 1 to FIG. 5 .

[0064] 1 , some embodiments of the present application provide a battery welding device, comprising a conveyor line 300, a cell loading device 200, a connecting piece loading device 100, and a welding device 400. The conveyor line 300 includes a plurality of carriers arranged in its conveying direction. The cell loading device 200 includes at least two cell loading mechanisms. The at least two cell loading mechanisms are respectively used to load at least two cell groups into at least two target carriers of the conveyor line 300, each cell group including at least two cells. The connecting piece loading device 100 is used to load connecting pieces into at least two target carriers. The welding device 400 is arranged beside the conveyor line 300. The conveyor line 300 is movably arranged to transport at least two target carriers to the welding device 400 in sequence for welding. The welding device 400 is used to weld the connecting piece and at least two cells in the target carrier.

[0065] The conveyor line 300 includes a plurality of carriers arranged in its conveying direction. The plurality of carriers are arranged at intervals on the conveyor line 300. The conveyor line 300 is movably arranged to drive the plurality of carriers thereon to convey forward along the conveying direction. A carrier refers to a carrier used to clamp or place battery cells and / or connecting pieces. In some embodiments, the carrier is a clamp. The plurality of carriers includes a target carrier, and the target carrier here refers to the loading target position of the battery cell loading device and the connecting piece loading device, that is, a plurality of carriers are arranged at different positions of the conveyor line 300, but the battery cell loading device and the connecting piece loading device do not load the battery cells or connecting pieces into any one carrier when loading, but load the battery cells and connecting pieces into the set target carrier according to the setting, so that the battery cells and connecting pieces can be welded in the same target carrier.

[0066] The battery cell loading device 200 includes at least two battery cell loading mechanisms. The at least two battery cell loading mechanisms are respectively used to load at least two battery cell groups into at least two target carriers of the conveyor line 300. That is to say, each battery cell loading mechanism is used to load one battery cell group into one target carrier. The battery cell loading device 200 of the embodiment of the present application includes at least two battery cell loading mechanisms, so at least two battery cell groups can be loaded at the same time. The connecting piece loading device 100 is used to load the connecting piece into at least two target carriers. In this way, each of the at least two target carriers contains a battery cell group and a connecting piece. In a specific embodiment, each target carrier contains two connecting pieces (such as a copper connecting piece and an aluminum connecting piece), and the two connecting pieces are used to respectively connect the second pole ear and the first pole ear of at least two battery cells of the battery cell group.

[0067] Each battery cell group includes at least two battery cells. The number of battery cells included in each battery cell group is determined according to the capacity of the battery. In a specific embodiment, each battery cell group includes two battery cells.

[0068] The welding device 400 is used to weld the connecting piece and at least two battery cells in the target carrier. The welding device 400 can be an ultrasonic welding device. The welding device 400 is used to weld the connecting piece and the tabs of at least two battery cells.

[0069] The cell loading device 200 of the battery welding equipment of the present embodiment includes at least two cell loading mechanisms, which can simultaneously load at least two cell groups into at least two target carriers of the conveyor line 300. The conveyor line 300 can then sequentially transport the at least two target carriers containing at least two cell groups to the position of the welding device 400, thereby allowing at least two cell groups to be welded simultaneously by the welding device 400, thereby improving welding efficiency. In addition, the conveyor line 300 of the battery welding equipment of the present embodiment is equipped with multiple carriers, which increases the buffer capacity and thus improves the fault tolerance of the equipment.

[0070] 3 , the battery cell loading device 200 includes a first battery cell loading mechanism 2004 and a second battery cell loading mechanism 2005. The first battery cell loading mechanism 2004 and the second battery cell loading mechanism 2005 each include a clamp for clamping the battery cell.

[0071] 1 , in some embodiments, the battery welding equipment includes two welding devices spaced apart in the conveying direction of the conveyor line 300. These are a first welding device 400a and a second welding device 400b. The first welding device 400a is used to weld the first tabs of at least two battery cells, and the second welding device 400b is used to weld the second tabs of at least two battery cells. The polarities of the first tab and the second tab are opposite.

[0072] The two welding devices are spaced apart in the conveying direction of the conveyor line 300, meaning that the two welding devices correspond to different positions on the conveyor line 300, both being located beside the conveyor line 300. In one specific embodiment, the first welding device 400a is a copper welding device, which is used to weld a copper connecting piece to the first tabs of at least two battery cells. The second welding device 400b is an aluminum welding device, which is used to weld an aluminum connecting piece to the second tabs of at least two battery cells.

[0073] The battery welding equipment of the embodiment of the present application includes two welding devices spaced apart in the conveying direction of the conveyor line 300. In this way, after the connecting plate and the battery cell group are loaded onto the target carrier, the target carrier is conveyed forward by the conveyor line and can be welded by the two welding devices in turn, thereby further improving the welding efficiency.

[0074] In some embodiments, the two welding devices include a copper welding device and an aluminum welding device.

[0075] Referring to Figure 1 , the first welding device 400a is a copper welding device. The second welding device 400b is an aluminum welding device. The first welding device 400a is used to weld a copper connecting piece to the first tabs of at least two battery cells. The second welding device 400b is used to weld an aluminum connecting piece to the second tabs of at least two battery cells.

[0076] The two welding devices in the embodiment of the present application include a copper welding device and an aluminum welding device. The copper welding device is used to weld the first pole tabs of at least two battery cells, and the aluminum welding device is used to weld the second pole tabs of at least two battery cells. In this way, as long as the target carrier carrying at least two battery cells is transported along the conveyor line, the connection of at least two battery cells can be achieved, thereby improving efficiency.

[0077] In some embodiments, the connecting sheet loading device 100 is used to load two connecting sheets into each target carrier, one of the two connecting sheets is used to connect the first pole tabs of at least two battery cells through a first welding device 400a, and the other of the two connecting sheets is used to connect the second pole tabs of at least two battery cells through a second welding device 400b.

[0078] The connector loading device 100 is used to transport multiple connectors to the conveyor line 300. For each target carrier, the connector loading device 100 places two connectors in each target carrier. Specifically, the two connectors are a copper connector and an aluminum connector. In other words, each target carrier is provided with a corresponding battery cell group and two connectors. The battery cell group includes at least two battery cells. One connector is used to connect the first tabs of at least two battery cells, and the other connector is used to connect the second tabs of at least two battery cells.

[0079] The connecting piece loading device 100 of the embodiment of the present application loads two connecting pieces to each target carrier to respectively connect the positive and negative poles of at least two battery cells, thereby realizing the grouping of at least two battery cells, completing the loading of the connecting pieces at one time, and improving production efficiency.

[0080] In some embodiments, referring to FIG2 , a connecting sheet loading device 100 includes a connecting sheet conveying device 1001, a connecting sheet storage device 1002, and a grabbing device 1003. The connecting sheet conveying device 1001 is used to convey a plurality of connecting sheets to the connecting sheet storage device 1002. The grabbing device 1003 is used to grab connecting sheets from the connecting sheet storage device 1002 and place them into a target carrier.

[0081] In some embodiments, each welding device 400 includes a first welding assembly 410 and a second welding assembly 420 disposed adjacent to each other. The target carrier is conveyed by the conveyor line and sequentially passes through the first welding assembly 410 and the second welding assembly 420 so that the first and second tabs of at least two battery cells are welded twice respectively.

[0082] As shown in Figure 1, the first welding device 400a includes two adjacent welding assemblies. The second welding device 400b also includes two adjacent welding assemblies. Thus, when the target carrier passes through the first welding device 400a while being transported by the conveyor line, it will undergo two welding processes in sequence by the two welding assemblies. Specifically, the first tabs and connecting tabs of at least two battery cells will first undergo a first welding process by one welding assembly, and then a second welding process by the other welding assembly. This results in the battery's negative electrode being welded twice, improving the welding yield rate and reducing the number of defective batteries due to poor welding. Similarly, when the target carrier passes through the second welding device 400b while being transported by the conveyor line, it will also undergo two welding processes in sequence by the two welding assemblies. Specifically, the second tabs and connecting tabs of at least two battery cells will first undergo a first welding process by one welding assembly, and then a second welding process by the other welding assembly. This results in the battery's positive electrode being welded twice, improving the welding yield rate and reducing the number of defective batteries due to poor welding.

[0083] 1 , the first welding assembly 410 includes at least two independently disposed welders 411. The at least two welders 411 are disposed corresponding to at least two target carriers to weld at least two battery cell groups in the at least two target carriers, respectively.

[0084] In the specific embodiment shown in FIG1 , the first welding assembly 410 includes two welders 411 . Therefore, in the specific embodiment shown in FIG1 , the battery cell loading device 200 includes two battery cell loading mechanisms, and the two battery cell loading mechanisms load two battery cell groups into two target carriers. Therefore, the conveyor line will transport the two target carriers to the welding device 400 . In this way, the two welders 411 correspond to the two target carriers, and then weld the battery cells and connecting pieces in the two target carriers respectively. In other words, one welder corresponds to one target carrier. In other embodiments not shown in the accompanying drawings, if the battery cell loading device 200 includes multiple battery cell loading mechanisms, and the multiple battery cell loading mechanisms are used to load multiple battery cell groups, then the first welding assembly 410 correspondingly includes multiple welders 411 . The multiple welders 411 are used to weld the multiple battery cell groups respectively.

[0085] The first welding assembly 410 of the embodiment of the present application is provided with at least two welders corresponding to the number of battery cell groups. In this way, after the conveyor line conveys at least two battery cell groups to the welding device, at least two welders can work simultaneously to perform the first welding on at least two battery cell groups at the same time, thereby further improving efficiency.

[0086] The second welding assembly 420 includes at least two independently arranged welders 411. The at least two welders 411 are arranged corresponding to the at least two target carriers to respectively weld the at least two battery cell groups in the at least two target carriers. After the first welding assembly 410 completes the first welding of the battery cell group, the battery cell group is transported by the conveyor line to the position of the second welding assembly 420 so that the second welding assembly 420 can perform a second welding on the battery cell group. Similarly, since the second welding assembly includes at least two independently arranged welders 411, the second welding assembly can also work simultaneously to simultaneously perform a second welding on at least two battery cell groups, further improving efficiency.

[0087] In some embodiments, the delivery line 300 comprises a looped delivery line.

[0088] The battery welding device of the embodiment of the present application arranges the conveyor line 300 in a ring shape, thereby allowing the connection piece loading device 100, the battery cell loading device 200, and the welding device 400 to be arranged at different positions on the conveyor line 300. This allows the target carrier to dock with multiple devices while being transported by the conveyor line. The conveying direction of the conveyor line can be kept consistent, eliminating reciprocating motion during the manufacturing process and avoiding waiting due to untimely process completion, thereby significantly improving efficiency. Furthermore, the circular conveyor line 300 allows loading, welding, and unloading to be performed in a smaller area compared to a linear conveyor line, thereby reducing the volume of the battery welding device.

[0089] In some embodiments, the conveyor line 300 includes a first conveying section 310 and a second conveying section 320 relatively spaced apart and a third conveying section 330 for connecting the first conveying section 310 and the second conveying section 320. The battery welding equipment includes two welding devices spaced apart in the conveying direction of the conveyor line 300. The two welding devices are used to weld the first pole tab and the second pole tab of at least two battery cells, respectively. One of the two welding devices is arranged next to the first conveying section 310, and the other of the two welding devices is arranged next to the second conveying section 320.

[0090] As shown in Figure 1 , the first conveying section 310 extends along a first direction X, and the second conveying section 320 also extends along the first direction X. The first conveying section 310 and the second conveying section 320 are arranged parallel to each other and spaced apart. The third conveying section 330 is disposed between the first conveying section 310 and the second conveying section 320 and extends along a second direction Y. The first direction X and the second direction Y are perpendicular to each other. The first welding device 400a is disposed beside the first conveying section 310, and the second welding device 400b is disposed beside the second conveying section 320.

[0091] By setting the third conveying section 330 between the first conveying section 310 and the second conveying section 320, the battery cell group can be directly conveyed to the second conveying section 320 through the third conveying section 330 to be welded by the second welding device 400a after being welded on the first conveying section 310. This arrangement makes it possible for the welding process of the battery cell group to not require transfer, and it is sufficient to control the conveying action of the conveyor line 300, which simplifies the control process.

[0092] In some embodiments, the conveyor line 300 further includes a fourth conveyor section 340 disposed opposite the third conveyor section 330. The first conveyor section 310, the third conveyor section 330, the second conveyor section 320, and the fourth conveyor section 340 are sequentially connected to form a closed loop conveyor line. The conveyor line 300 forms a closed loop conveyor line, so that when the carrier carrying the battery cell group is unloaded after welding, the empty carrier can continue to be transported back to the receiving position along the conveyor line, and then the connecting sheet loading device 100 and the battery cell loading device 200 can continue to load materials into the empty carrier, thereby allowing the battery welding equipment of the embodiment of the present application to operate continuously and improve operating efficiency.

[0093] In some embodiments, the battery welding apparatus further includes a cell unloading device 600. The cell unloading device 600 interfaces with the conveyor line 300 to unload the welded cell groups. This allows the battery welding apparatus of the present embodiment to cover the entire process of loading, welding, and unloading.

[0094] As shown in Figure 1 , the cell unloading device 600 extends along the second direction Y. After the second and first tabs are welded, the cell assembly continues to be transported forward by the conveyor line 300. Once it reaches the position of the cell unloading device 600, the cell assembly is unloaded by the cell unloading device 600. The provision of the cell unloading device 600 automates the unloading process of the battery welding equipment.

[0095] In some embodiments, the battery welding equipment includes at least two battery cell unloading devices, which are spaced apart in the conveying direction of the conveyor line 300 to unload the welded battery cell groups in at least two target carriers.

[0096] 1 exemplarily shows that the battery welding equipment includes a first cell unloading device 600a and a second cell unloading device 600b. The first cell unloading device 600a is used to unload cell groups from one target carrier, and the second cell unloading device 600b is used to unload cell groups from another target carrier.

[0097] The battery welding equipment of the embodiment of the present application includes at least two target carriers. Therefore, in order to enable the battery cell groups in the at least two target carriers to be unloaded under the conveyance of the conveyor line, the battery welding equipment of the embodiment of the present application is provided with at least two battery cell unloading devices.

[0098] In some embodiments, the conveyor line includes a magnetically driven conveyor line. Magnetically driven conveyor lines have advantages such as flexible, high-speed, and stable transmission. Their application in product manufacturing processes can significantly improve product manufacturing efficiency.

[0099] In some embodiments, the conveyor line is configured to convey in a step-by-step manner in its conveying direction. Here, the conveyor line conveying in a step-by-step manner in its conveying direction refers to the conveyor line moving forward in a set distance in the conveying direction. In other words, the distance of each step is fixed. For example, the conveyor line can be a step-by-step conveyor line. The conveyor line of the present application is configured to convey in a step-by-step manner so that the conveyor line drives the carriers thereon to move step by step at a fixed distance. Specifically, each time the conveyor line moves, all carriers on the conveyor line move forward two positions.

[0100] The conveying line of the embodiment of the present application is configured for step-by-step conveying, which is beneficial to improving the control accuracy of the position reached by the carrier.

[0101] Referring to FIG5 , an embodiment of the present application further provides a battery welding method, comprising the following steps:

[0102] S510, loading a plurality of connecting sheets into at least two target carriers;

[0103] S520, loading at least two battery cell groups into at least two target carriers, each battery cell group including at least two battery cells;

[0104] S530, controlling the conveyor line 300 to convey at least two target carriers to the welding device 400; and

[0105] S540: Control the welding device 400 to weld the connecting piece and at least two battery cells in the target carrier.

[0106] The battery welding method of the embodiment of the present application loads at least two battery cell groups into at least two target carriers of the conveyor line 300, and then the conveyor line 300 can sequentially transport the at least two target carriers containing at least two battery cell groups to the position of the welding device 400, so that the at least two battery cell groups are welded by the welding device 400 in sequence, thereby improving the welding efficiency.

[0107] In some embodiments, the battery welding method further includes detecting whether a battery cell group is placed in the target carrier before controlling the conveyor line to transport at least two target carriers to the welding device. If a battery cell group is detected in the target carrier, the conveyor line is controlled to operate; if no battery cell group is detected in the target carrier, the battery cell loading mechanism is controlled to load the battery cell group into the target carrier before controlling the conveyor line 300 to transport the battery cell group. By detecting whether a battery cell group is placed in the target carrier, it is ensured that both the battery cell group and the connecting piece are present in the target carrier transported to the welding device, thereby ensuring smooth welding. This can avoid repeated rework caused by missing cells and improve work efficiency.

[0108] In some embodiments, the battery welding equipment includes a first welding device 400a and a second welding device 400b spaced apart in the conveying direction of the conveyor line 300, and the conveyor line is controlled to convey at least two target carriers to the welding device for welding. The welding device 400 is used to weld the connecting piece and at least two battery cells in the target carrier, including: controlling the conveyor line to convey at least two target carriers to the first welding device 400a and controlling the first welding device 400a to work to weld the first pole ears of at least two battery cells in the target carrier, and then controlling the conveyor line to convey at least two target carriers to the second welding device 400b and controlling the second welding device 400b to work to weld the second pole ears of at least two battery cells in the target carrier.

[0109] Referring to FIG1 , the target carrier is first transported by the conveyor line 300 to the first welding device 400a for welding of the first tab. After welding is completed, the target carrier is transported by the conveyor line 300 to the second welding device 400b for welding of the second tab. After welding of the tabs is completed, the battery cell group of the target carrier will be unloaded by the battery cell unloading device 600. Of course, in some other embodiments, the target carrier can also be transported by the conveyor line 300 to first weld the second tab and then weld the first tab. The order of welding the tabs is not limited here.

[0110] In some embodiments, each welding device 400 includes a first welding assembly 410 and a second welding assembly 420 arranged adjacent to each other, and controlling the welding device 400 to work to weld the connecting piece and at least two battery cells in the target carrier includes: controlling the target carrier conveyor line to convey the first welding assembly 410 and the second welding assembly 420 in sequence so that the first pole tabs and / or the second pole tabs of at least two battery cells are respectively welded twice.

[0111] The battery welding method of the embodiment of the present application performs two welding operations on the first and second tabs of the battery cell group, thereby improving the welding yield and reducing the number of unqualified batteries caused by poor welding.

[0112] The structure and working process of a battery welding device according to a specific embodiment of the present application are described in detail below with reference to FIG. 1 to FIG. 4 .

[0113] As shown in FIG1 , the battery welding equipment of this embodiment includes a connecting piece loading device 100 , a battery cell loading device 200 , a conveyor line 300 , a first welding device 400 a , a second welding device 400 b , a first battery cell unloading device 600 a and a second battery cell unloading device 600 b .

[0114] The conveyor line 300 is a circular conveyor line comprising a first conveying section 310, a second conveying section 320, a third conveying section 330, and a fourth conveying section 340. The first conveying section 310 and the second conveying section 320 are arranged in parallel and spaced apart. The third conveying section 330 is disposed between the first conveying section 310 and the second conveying section 320. The fourth conveying section 340 is disposed between the second conveying section 320 and the first conveying section 310. Thus, the first conveying section 310, the second conveying section 320, the third conveying section 330, and the fourth conveying section 340 are sequentially connected to form a closed circular conveyor line.

[0115] The connecting piece loading device 100 , the battery cell loading device 200 , the first battery cell unloading device 600 a and the second battery cell unloading device 600 b are respectively docked with different positions of the conveyor line 300 to achieve loading and unloading.

[0116] In this embodiment, the connecting sheet loading device 100 is used to load connecting sheets into two target carriers among a plurality of carriers. Specifically, for each target carrier, the connecting sheet loading device 100 loads two connecting sheets into the target carrier. The two connecting sheets include a first connecting sheet and a second connecting sheet. Specifically, the first connecting sheet includes a copper connecting sheet, and the second connecting sheet includes an aluminum connecting sheet.

[0117] As shown in Figure 2, the connector loading device 100 includes a connector conveying device 1001, a connector storage device 1002, a gripping device 1003, a positioning mechanism 1004, and a connector loading mechanism 1005. The connector conveying device 1001 is used to transfer a tray containing copper and aluminum connectors to the connector storage device 1002. The gripping device 1003 (e.g., a robot) takes one copper and one aluminum connector from the connector storage device 1002 along a preset path and places them on the positioning mechanism 1004. The positioning mechanism 1004 is then controlled to move laterally, and the connector loading mechanism 1005 removes the copper and aluminum connectors from the positioning mechanism 1004, moves them laterally, and places them into the target carrier, completing the connector loading process.

[0118] The cell loading device 200 is used to load two cell groups into two target carriers among a plurality of carriers. Specifically, for each target carrier, the cell loading device 200 loads one cell group into the target carrier. Each cell group includes two cells. Thus, after both the connecting plate loading device 100 and the cell loading device 200 have completed loading, each target carrier carries two cells and two connecting plates. The cell here refers to the electrode assembly. Each cell includes a first tab and a second tab of opposite polarity.

[0119] As shown in Figure 3, the battery cell loading device 200 includes two battery cell loading mechanisms. The two loading mechanisms include a first battery cell loading mechanism 2004 and a second battery cell loading mechanism 2005. Specifically, the battery cell loading device 200 also includes a first transfer mechanism 2001, a second transfer mechanism 2002, and a transfer platform 2003. The first transfer mechanism 2001 and the second transfer mechanism 2002 are used to take one battery cell from the feed belt respectively and place the two battery cells on the transfer platform 2003. The first battery cell loading mechanism 2004 and the second battery cell loading mechanism 2005 remove the battery cells from the transfer platform 2003 and place the battery cells into a target carrier equipped with a connecting piece, completing the battery cell loading process.

[0120] For example, the first transfer mechanism 2001 includes a transfer jaw 20011, a transfer screw 20012, and a transfer moving mechanism 20013. The transfer jaw 20011 is used to clamp the battery cell. The transfer jaw 20011 is connected to the output end of the transfer screw 20012. The transfer screw 20012 is connected to the transfer moving mechanism 20013. The transfer moving mechanism 20013 can move along the extension direction of the transfer platform. The transfer jaw 20011 can be raised and lowered under the drive of the transfer screw 20012. The transfer screw 20012 can be moved along the extension direction of the transfer platform under the drive of the transfer moving mechanism 20013. This structure allows the transfer jaws 20011 to lift the battery cells from the feed belt after gripping them. The transfer screw 20012 then drives the transfer jaws 20011 upward, allowing the transfer mechanism 20013 to move along the extension of the transfer platform, transferring the battery cells to a suitable location on the transfer platform for placement. The second transfer mechanism 2002 can be configured to have the same structure as the first transfer mechanism 2001.

[0121] For example, the first battery cell loading mechanism 2004 includes a loading jaw 20041, a loading screw 20042, and a loading moving mechanism 20043. The loading jaw 20041 is used to clamp the battery cell. The loading jaw 20041 is connected to the output end of the loading screw 20042, and the loading screw 20042 is connected to the loading moving mechanism 20043. The loading moving mechanism 20043 can move in a direction perpendicular to the target carrier's movement direction. The loading jaw 20041 can be raised and lowered under the drive of the loading screw 20042, and the loading screw 20042 can be moved in a direction perpendicular to the target carrier's movement direction under the drive of the loading moving mechanism 20043. This structure allows the loading jaws 20041 to lift the battery cells from the transfer platform after gripping them. The loading screw 20042 then drives the loading jaws 20041 upward, and the loading mechanism 20043 then moves perpendicular to the target carrier's direction of movement, transferring the battery cells to the top of the target carrier for placement within the target carrier with the connecting piece. The second battery cell loading mechanism 2005 can be configured to have the same structure as the first battery cell loading mechanism 2004.

[0122] The first welding device 400a is used to connect the two first tabs of two battery cells using a first connecting piece, specifically, welding the first connecting piece to the two first tabs of the two battery cells. The second welding device 400b is used to connect the second tabs of two battery cells using a second connecting piece, specifically, welding the second connecting piece to the two second tabs of the two battery cells.

[0123] After the two cells are connected, the target carrier continues to be transported by the conveyor line 300 until it reaches the position where it interfaces with the cell unloading device 600. The cell unloading device 600 then unloads the welded cell group. The empty carrier then continues to be transported by the conveyor line 300 back to the loading position.

[0124] The conveyor line 300 of this embodiment is provided with two target carriers, so that when the conveyor line is conveying, the two target carriers will be conveyed to the first welding device 400a at the same time. As shown in Figure 1, the first welding device 400a includes four welders. Two of the welders form a first welding assembly, and the other two welders form a second welding assembly. After the two target carriers arrive at the first welding device 400a, the two target carriers are set correspondingly to the two welders of the first welding assembly. In this way, the two welders of the first welding assembly can respectively perform the first welding on the first tabs and connecting tabs of the battery cell groups in the two target carriers. After completing the first welding, the conveyor line 300 continues to move forward two positions, thereby allowing the two target carriers to be set correspondingly to the two welders of the second welding assembly. In this way, the two welders of the second welding assembly can respectively perform the second welding on the first tabs and connecting tabs of the battery cell groups in the two target carriers, thereby avoiding the problem of welding inefficiently and improving the welding quality.

[0125] After completing the welding of the first tabs of the two battery cell groups, the conveyor line 300 continues to move forward and drives the two target carriers to move to the second welding device 400b through the third conveying section 330. The second welding device 400b also includes four welders 411. Two of the welders form a first welding assembly, and the other two welders form a second welding assembly. Its working process is similar to that of the first welding device 400a and will not be repeated here. The difference is that the welder of the first welding device 400a welds the two second tabs of the two battery cells of the battery cell group. Specifically, the welders of the first welding device 400a are all copper welding welders, and the welders of the second welding device 400b are all aluminum welding welders.

[0126] As shown in Figure 4 , the welder 411 includes a welder body 4112 and a moving device 4111. The moving device 4111 is used to drive the welder body 4112 in a second direction Y. When welding is required for battery cells or connectors within the target carrier, the moving device 4111 moves the welder body 4112 horizontally to the welding position, where the welder body 4112 performs the welding. After welding is completed, the moving device 4111 moves the welder body 4112 horizontally to the initial position to await the next welding instruction. Multiple welders share the same structure.

[0127] Exemplarily, the moving device 4111 includes a first guide rail 41111, a second guide rail 41112 and a supporting seat 41113, the supporting seat 41113 is movably connected to the second guide rail 41112, the first guide rail 41111 is fixed to the supporting seat 41113, the welding machine body 4112 is movably connected to the first guide rail 41111, and the extension direction of the first guide rail 41111 is perpendicular to the extension direction of the second guide rail 41112.

[0128] By fixing the first guide rail 41111 to the bearing seat 41113 and movably connecting the bearing seat 41113 to the second guide rail 41112, the first guide rail 41111 on the bearing seat 41113 can be moved along the extension direction of the second guide rail 41112, so that the welder body 4112 can be moved along the extension direction of the second guide rail 41112. Since the welder body 4112 is movably connected to the first guide rail 41111, the welder body 4112 can not only move along the extension direction of the second guide rail 41112, but also move along the extension direction of the first guide rail 41111.

[0129] By arranging the extension direction of the first guide rail 41111 perpendicular to the extension direction of the second guide rail 41112, the welder body 4112 can move in two directions perpendicular to each other, so that the welder body 4112 has good flexibility, which is conducive to improving the convenience of welding.

[0130] Illustratively, the welding machine body 4112 includes a welding head 41121 and a telescopic cylinder 41122. The welding head 41121 is connected to the output end of the telescopic cylinder 41122, so that the welding head 41121 can move under the drive of the telescopic cylinder 41122. By setting the telescopic direction of the telescopic cylinder 41122 to be perpendicular to the extension direction of the second guide rail 41112 and the extension direction of the first guide rail 41111, the welding head 41121 can move in three mutually perpendicular directions, so that the welding head 41121 has good flexibility when welding.

[0131] A plurality of carriers are provided on the conveyor line 300. The carriers are used to carry and place the battery cell groups and connecting pieces to be welded. In a specific embodiment, the conveyor line 300 is a magnetic drive circulation line assembly, and eleven groups of carriers are provided on the conveyor line 300. One side of the first conveying section 310 is the connecting piece and battery cell loading side. Two carriers form a group. Each time the magnetic drive moves forward, all the carriers on the conveyor line 300 will move forward two positions. After the connecting pieces and battery loading are completed, the magnetic drive moves forward to the first welding device 400a to complete two brazing operations. After the brazing is completed, the two carriers are moved from the third conveying section 330 to the second conveying section 320, and the second welding device 400b performs aluminum welding.

[0132] As shown in Figure 1, after completing the welding work, the two carriers are driven forward by the magnetic drive to the unloading position, and the first battery cell unloading device 600a transfers the battery cell group in one carrier to the lower section station to complete the battery transfer unloading process. The empty carrier and another full carrier are then moved to another unloading position by the fourth conveying section 340, and the second battery cell unloading device 600b transfers the battery cells in the other carrier to the lower section station to complete the unloading process. After unloading, the empty carrier continues to move forward along the conveyor line 300 to carry out a new round of loading process.

[0133] The battery welding device of this embodiment can realize the functions of feeding the battery cells from the feed belt, completing the welding requirements, and finally discharging the battery cells. The specific process is as follows: As shown in Figures 1 and 2, first, the connecting piece loading device 100 transfers the connecting piece from the connecting piece loading tray to the two target carriers of the conveyor line 300 after secondary positioning, and then the battery cell loading device 200 places the two battery cell groups on the feeding assembly line into the two target carriers of the conveyor line 300. The conveyor line 300 is responsible for transporting the target carrier loaded with the connecting piece and the battery cell group to the two carrier positions in turn for copper welding, and continues to transport it forward for aluminum welding. After completion, the target carrier loaded with the battery cell group is transported by the conveyor line 300 to the unloading position for unloading process. After unloading, the empty carrier is transported by the conveyor line 300 to the connecting piece loading position for a new round of action process.

[0134] The battery cell loading device 200 of this embodiment is designed with two sets of battery cell loading mechanisms, which can process two battery cell groups, namely four batteries, at the same time, thereby improving the processing capacity, accelerating the production efficiency, and increasing the equipment output.

[0135] Each battery cell assembly and connector requires two copper and aluminum welding steps, improving weld yield and reducing the number of failed batteries due to poor welding. Furthermore, the conveyor line 300 features eleven carriers, allowing for a maximum of eleven groups (or twenty-two batteries) to be buffered simultaneously. This increased buffer capacity improves equipment fault tolerance.

[0136] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery welding device, comprising: A conveying line, including a plurality of carriers arranged in its conveying direction; A battery cell loading device, including at least two battery cell loading mechanisms, each of the at least two battery cell loading mechanisms being configured to load at least two battery cell groups into at least two target carriers of the conveying line, each battery cell group including at least two battery cells; A connecting piece loading device, configured to load connecting pieces into the at least two target carriers; And A welding device, arranged beside the conveying line, the conveying line being movably arranged to sequentially convey the at least two target carriers to the welding device for welding, the welding device being configured to weld the connecting pieces and at least two battery cells in the target carriers.

2. The battery welding device according to claim 1, wherein, The battery welding device includes two welding devices spaced apart in the conveying direction of the conveying line, the two welding devices including a first welding device and a second welding device, the first welding device being configured to weld the first pole ears of the at least two battery cells, the second welding device being configured to weld the second pole ears of the at least two battery cells, the polarities of the first pole ears and the second pole ears being opposite.

3. The battery welding device according to claim 2, wherein, The first welding device includes a brazing device; and / or, the second welding device includes an aluminum welding device.

4. The battery welding device according to claim 2 or 3, wherein, The connecting piece loading device is configured to load two connecting pieces into each target carrier, one of the two connecting pieces being configured to connect the first pole ears of the at least two battery cells through the first welding device, and the other of the two connecting pieces being configured to connect the second pole ears of the at least two battery cells through the second welding device.

5. The battery welding device according to any one of claims 2 to 4, wherein, Each welding device includes a first welding component and a second welding component arranged adjacent to each other, the target carrier sequentially passing through the first welding component and the second welding component under the conveyance of the conveying line so that the first pole ears and the second pole ears of the at least two battery cells are welded twice respectively.

6. The battery welding device according to claim 5, wherein, The first welding component includes at least two welding machines arranged independently, the at least two welding machines being correspondingly arranged with the at least two target carriers to respectively weld the at least two battery cell groups in the at least two target carriers; and / or, The second welding component includes at least two welding machines arranged independently, the at least two welding machines being correspondingly arranged with the at least two target carriers to respectively weld the at least two battery cell groups in the at least two target carriers.

7. The battery welding device according to claim 6, wherein, The welding machine includes a welding machine body and a moving device, the welding machine body being connected to the moving device, the moving device being configured to drive the welding machine body to move.

8. The battery welding device according to claim 7, wherein, The moving direction of the welding machine body is perpendicular to the conveying direction of the conveying line.

9. The battery welding device according to claim 7, wherein, The moving device is configured to drive the welding machine body to reciprocate between an initial position and a welding position.

10. The battery welding device according to claim 7, wherein, The moving device includes a first guide rail, a second guide rail and a bearing seat, the bearing seat being movably connected to the second guide rail, the first guide rail being fixed to the bearing seat, the welding machine body being movably connected to the first guide rail, the extending direction of the first guide rail being perpendicular to the extending direction of the second guide rail.

11. The battery welding device according to any one of claims 1 to 10, wherein, The conveying line includes a circular conveying line.

12. The battery welding device according to claim 11, wherein, The conveyor line includes a first conveying section and a second conveying section that are relatively spaced apart, and a third conveying section for connecting the first conveying section and the second conveying section. The battery welding device includes two welding devices that are spaced apart in the conveying direction of the conveyor line. The two welding devices are respectively used to weld the first electrode tabs and the second electrode tabs of the at least two battery cells. One of the two welding devices is arranged beside the first conveying section, and the other welding device of the two welding devices is arranged beside the second conveying section.

13. The battery welding device according to claim 12, wherein, The conveyor line further includes a fourth conveying section that is arranged opposite to the third conveying section. The first conveying section, the third conveying section, the second conveying section, and the fourth conveying section are sequentially connected to form a closed loop conveyor line.

14. The battery welding device according to any one of claims 1 to 13, wherein, The battery welding device further includes a battery cell unloading device, and the battery cell unloading device is docked with the conveyor line to unload the welded battery cell group.

15. The battery welding device according to claim 14, wherein, The battery welding device includes at least two battery cell unloading devices, and the at least two battery cell unloading devices are spaced apart in the conveying direction of the conveyor line to unload the welded battery cell groups in the at least two target carriers.

16. The battery welding device according to any one of claims 1 to 15, wherein, In the conveying direction of the conveyor line, the battery cell unloading device is located upstream of the battery cell loading device and the connecting piece loading device.

17. The battery welding device according to claim 16, wherein, The at least two battery cell unloading devices include a first battery cell unloading device and a second battery cell unloading device that are spaced apart in the conveying direction of the conveyor line. The at least two target carriers include a first target carrier and a second target carrier that are spaced apart in the conveying direction of the conveyor line. The first battery cell unloading device is used to unload the battery cells in the first target carrier, and the second battery cell unloading device is used to unload the battery cells in the second target carrier.

18. The battery welding device according to any one of claims 1 to 17, wherein, The connecting piece loading device includes a connecting piece conveying device, a connecting piece storage device, and a grasping device. The connecting piece conveying device is used to convey a plurality of connecting pieces to the connecting piece storage device, and the grasping device is used to grasp the connecting pieces from the connecting piece storage device and place them into the target carrier.

19. The battery welding device according to claim 18, wherein, The connecting piece loading device further includes a positioning mechanism and a connecting piece loading mechanism. The grasping device can place the connecting piece into the positioning mechanism, and the connecting piece loading mechanism is used to lower the connecting piece in the positioning mechanism into the target carrier.

20. The battery welding device according to any one of claims 1 to 19, wherein, The conveyor line includes a magnetic drive conveyor line.

21. The battery welding device according to any one of claims 1 to 20, wherein, The battery cell loading device includes a first transfer mechanism, a second transfer mechanism, and a transfer platform. The first transfer mechanism and the second transfer mechanism are respectively used to place the battery cells onto the transfer platform, and the battery cell loading mechanism is used to place the battery cells on the transfer platform into the target carrier.

22. The battery welding device according to any one of claims 1 to 21, wherein, The at least two battery cell loading mechanisms include a first battery cell loading mechanism and a second battery cell loading mechanism. The first battery cell loading mechanism and the second battery cell loading mechanism respectively place the two battery cells on the transfer platform into the target carrier.

23. A battery welding method based on the battery welding device according to claim 1, comprising the following steps: Loading a plurality of connecting pieces into at least two target carriers; Load at least two battery cell groups into at least two target carriers respectively, where each battery cell group includes at least two battery cells; cells; Control the conveyor line to move so as to sequentially convey the at least two target carriers to the welding device; and Control the welding device to operate to weld the connecting pieces and at least two battery cells in the target carrier.

24. The battery welding method according to claim 23, wherein, The battery welding method further includes, before controlling the conveyor line to move to convey the at least two target carriers to the welding device, detecting whether a battery cell group is placed in the target carrier. If it is detected that a battery cell group is placed in the target carrier, then control the conveyor line to move; if it is detected that there is no battery cell group in the target carrier, then first control the battery cell loading mechanism to load the battery cell group into the target carrier and then control the conveyor line to convey.

25. The battery welding method according to claim 23 or 24, wherein, The battery welding equipment includes a first welding device and a second welding device which are arranged at intervals in the conveying direction of the conveyor line. Controlling the conveyor line to convey the at least two target carriers to the welding device for welding, and the welding device for welding the connecting pieces and at least two battery cells in the target carrier includes: controlling the conveyor line to convey the at least two target carriers to the first welding device and controlling the first welding device to operate to weld the first tabs of at least two battery cells in the target carrier, and then controlling the conveyor line to convey the at least two target carriers to the second welding device and controlling the second welding device to operate to weld the second tabs of at least two battery cells in the target carrier.

26. The battery welding method according to any one of claims 23 to 25, wherein Each of the welding devices includes a first welding assembly and a second welding assembly which are arranged adjacent to each other. Controlling the welding device to operate to weld the connecting pieces and at least two battery cells in the target carrier includes: controlling the target carrier to sequentially pass through the first welding assembly and the second welding assembly under the conveyance of the conveyor line so that the first tabs and / or the second tabs of the at least two battery cells are welded twice respectively.

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