Battery welding equipment and battery welding method

Abstract

The invention provides battery welding equipment and a battery welding method. The battery welding equipment 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 the conveying direction of the conveying line. The battery cell feeding device comprises at least two battery cell feeding mechanisms, the at least two battery cell feeding mechanisms are used for feeding at least two battery cell sets into at least two target carriers of the conveying line, and each battery cell set comprises at least two battery cells. The connecting piece feeding device is used for feeding the connecting pieces into the at least two target carriers. And the welding device is arranged beside the conveying line. The conveying line is movably arranged so that the at least two target carriers can be sequentially conveyed to the welding device to be welded. The welding device is used for welding the connecting piece and the at least two battery cells in the target carrier. According to the battery welding equipment, the welding efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and relates to a battery welding device and a battery welding method. Background Art

[0002] With the new energy vehicles entering the high-speed development stage, the demand for power batteries is also increasing day by day. In order to meet the demand for power batteries, it is necessary to improve the production efficiency of the battery production line. And as an important device on the battery production line, the improvement of the production efficiency of the battery welding device is very important for the improvement of the battery output. Therefore, how to improve the welding efficiency of the battery is an urgent problem to be solved. Summary of the Invention

[0003] 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.

[0004] In the first aspect of the present application, a battery welding device is provided, which includes a conveyor line, a 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 cell loading device includes at least two cell loading mechanisms, and 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, and each cell group includes at least two cells. The connecting piece loading device is used to load the connecting pieces into at least two target carriers. The welding device is arranged beside the conveyor line. The conveyor line is movably arranged to sequentially convey at least two target carriers to the welding device for welding. The welding device is used to weld the connecting pieces and at least two cells in the target carriers.

[0005] The cell loading device of the battery welding device according to the embodiment of the present application includes at least two cell loading mechanisms, so that at least two cell groups can be loaded into at least two target carriers of the conveyor line at the same time. Then, the conveyor line can sequentially convey at least two target carriers loaded with at least two cell groups to the position of the welding device, so that at least two cell groups are welded by the welding device at the same time, thereby improving the welding efficiency. Moreover, a plurality of carriers are arranged on the conveyor line of the battery welding device according to the embodiment of the present application, increasing the buffer capacity, and thereby improving the fault tolerance rate of the device.

[0006] In some embodiments, the battery welding device includes two welding devices spaced apart in the conveying direction of the conveyor line. The two welding devices include a first welding device and a second welding device. The first welding device is used to weld the first ear of at least two cells, and the second welding device is used to weld the second ear of at least two cells. The polarities of the first ear and the second ear are opposite.

[0007] The battery welding equipment according to the embodiments of the present application includes two welding devices spaced apart in the conveying direction of the conveying line. In this way, after the connecting piece and the battery cell group are loaded onto the target carrier, the target carrier can be conveyed forward by the conveying line and then sequentially welded by the two welding devices, thereby further improving the welding efficiency.

[0008] In some embodiments, the first welding device includes a brazing device; and / or, the second welding device includes an aluminum welding device.

[0009] The two welding devices according to the embodiments of the present application include a brazing device and an aluminum welding device. The brazing device is used to weld the first pole ears of at least two battery cells, and the aluminum welding device is used to weld the second pole ears of at least two battery cells. In this way, as long as the target carrier carrying at least two battery cells is conveyed along the conveying line, the connection of the two pole ears of at least two battery cells can be realized, improving the efficiency.

[0010] In some embodiments, the connecting piece loading device is used to load two connecting pieces into each target carrier. One of the two connecting pieces is used to connect the first pole ears of at least two battery cells through the first welding device, and the other of the two connecting pieces is used to connect the second pole ears of at least two battery cells through the second welding device.

[0011] The connecting piece loading device according to the embodiments of the application loads two connecting pieces for each target carrier to respectively connect the positive and negative electrodes 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 the production efficiency.

[0012] In some embodiments, each welding device includes a first welding component and a second welding component arranged adjacent to each other. The target carrier sequentially passes through the first welding component and the second welding component under the conveying of the conveying line so that the first pole ears and the second pole ears of at least two battery cells are respectively welded twice.

[0013] In this way, when the target carrier passes through the first welding device under the conveying of the conveying line, it will be welded twice by the two welding components in sequence. Specifically, the first pole ears of at least two battery cells and the connecting piece will first be welded for the first time by one welding component, and then be welded for the second time by the other welding component. In this way, the negative electrode of the battery needs to be welded twice, improving the welding yield rate and reducing the number of unqualified batteries caused by poor welding. Similarly, when the target carrier passes through the second welding device under the conveying of the conveying line, it will also be welded twice by the two welding components in sequence. Specifically, the second pole ears of at least two battery cells and the connecting piece will first be welded for the first time by one welding component, and then be welded for the second time by the other welding component. In this way, the positive electrode of the battery needs to be welded twice, improving the welding yield rate and reducing the number of unqualified batteries caused by poor welding.

[0014] In some embodiments, the first welding assembly includes at least two welding machines provided independently. The at least two welding machines are correspondingly arranged with at least two target carriers to weld at least two battery cell groups in the at least two target carriers respectively; and / or, the second welding assembly includes at least two welding machines provided independently. The at least two welding machines are correspondingly arranged with at least two target carriers to weld at least two battery cell groups in the at least two target carriers respectively.

[0015] By arranging at least two welding machines corresponding to the number of battery cell groups in the first welding assembly of the embodiments of the present application, after the conveyor line conveys at least two battery cell groups to the welding device, the at least two welding machines can work simultaneously to weld the at least two battery cell groups for the first time, further improving the efficiency.

[0016] In some embodiments, the conveyor line includes a circular conveyor line.

[0017] The conveyor line of the embodiments of the present application includes a circular conveyor line. In this way, the target carrier can be docked with multiple devices under the conveyance of the conveyor line. The conveyance direction of the conveyor line can be kept consistent, and there is no reciprocating movement during the manufacturing process, avoiding the waiting phenomenon caused by untimely completion of processes, thereby greatly improving the efficiency.

[0018] In some embodiments, the conveyor line includes a first conveying section and a second conveying section arranged at a relatively spaced interval 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 at intervals in the conveying direction of the conveyor line. The two welding devices are respectively used to weld the first pole ears and the second pole ears of 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.

[0019] By arranging the third conveying section between the first conveying section and the second conveying section, after the battery cell group is welded by the first welding device on the first conveying section, it can be directly conveyed to the second conveying section through the third conveying section to be welded by the second welding device. Such an arrangement enables the welding process of the battery cell group not to require transfer, and only the conveying action of the conveyor line needs to be controlled, and the control process is simple.

[0020] In some embodiments, the conveyor line further includes a fourth conveying section 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 connected in sequence to form a closed circular conveyor line.

[0021] The conveyor line forms a closed loop conveyor line. In this way, after the carrier carrying the battery cell group is welded and unloaded, the empty carrier can continue to return to the loading position along with the conveyance of the conveyor line. Then, the connecting piece loading device and the battery cell loading device can continue to load materials into the empty carrier, thereby enabling the battery welding equipment of the embodiment of the present application to work continuously and improving the operation efficiency.

[0022] In some embodiments, the battery welding equipment 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.

[0023] The battery cell unloading device is docked with the conveyor line to unload the welded battery cell group. This enables the battery welding equipment of the embodiment of the present application to cover the entire process of loading, welding, and unloading.

[0024] In some embodiments, the battery welding equipment 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 at least two target carriers.

[0025] The battery welding equipment of the embodiment of the present application includes at least two target carriers. Therefore, in order to unload the battery cell groups in at least two target carriers 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.

[0026] In some embodiments, 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 onto 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.

[0027] The second aspect of the present application provides a battery welding method based on the above battery welding equipment, including the following steps:

[0028] Load a plurality of connecting pieces into at least two target carriers;

[0029] Correspondingly load at least two battery cell groups into at least two target carriers, and each battery cell group includes at least two battery cells;

[0030] Control the conveyor line to act to sequentially convey at least two target carriers to the welding device; and

[0031] Control the welding device to work to weld the connecting pieces and at least two battery cells in the target carrier.

[0032] The battery welding method according to the embodiment of the present application feeds at least two battery cell groups into at least two target carriers on the conveyor line. Then, the conveyor line can sequentially convey at least two target carriers containing at least two battery cell groups to the position of the welding device, so that at least two battery cell groups are sequentially welded by the welding device, thereby improving the welding efficiency.

[0033] 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 move and convey 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 move; if it is detected that there is no battery cell group in the target carrier, the battery cell feeding mechanism is first controlled to feed the battery cell group into the target carrier and then the conveyor line is controlled to convey.

[0034] 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 conveyed to the welding device, thereby ensuring the smooth progress of welding. This can avoid repeated rework caused by missing placement and improve work efficiency.

[0035] 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. The conveyor line is controlled to convey at least two target carriers to the welding device for welding. The welding device for welding the connecting piece and at least two battery cells in the target carrier includes: 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 tabs 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 tabs of at least two battery cells in the target carrier.

[0036] After the connecting piece and the battery cell group are fed into the target carrier according to the battery welding method of the embodiment of the present application, the target carrier can be sequentially welded by two welding devices under the conveyance of the conveyor line, thereby further improving the welding efficiency.

[0037] In some embodiments, each welding device includes a first welding component and a second welding component arranged adjacent to each other. 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 to sequentially pass through the first welding component and the second welding component under the conveyance of the conveyor line so that the first tabs and / or the second tabs of at least two battery cells are welded twice respectively.

[0038] The battery welding method according to the embodiment of the application performs two weldings on the first tabs and the second tabs of the battery cell group respectively, thereby improving the welding yield rate and reducing the number of unqualified batteries caused by poor welding.

[0039] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. Brief Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0042] Figure 1 It is a schematic structural diagram of a battery welding device according to some embodiments of the present application;

[0043] Figure 2 It is a schematic diagram of a connecting piece feeding device according to some embodiments of the present application;

[0044] Figure 3 It is a schematic structural diagram of a battery cell feeding device according to some embodiments of the present application

[0045] Figure 4 It is a schematic structural diagram of a welding machine according to some embodiments of the present application;

[0046] Figure 5 It is a schematic diagram of the steps of a battery welding method according to some embodiments of the present application;

[0047] In the drawings, the drawings are not drawn to actual scale.

[0048] Marking Explanation:

[0049] Conveyor line 300, first conveyor section 310, second conveyor section 320, third conveyor section 330, fourth conveyor section 340;

[0050] Connecting piece feeding device 100, connecting piece conveying device 1001, connecting piece storage device 1002, grasping device 1003, positioning mechanism 1004, connecting piece feeding mechanism 1005;

[0051] Battery cell feeding device 200, first transfer mechanism 2001, second transfer mechanism 2002, transfer platform 2003, first battery cell feeding mechanism 2004, second battery cell feeding mechanism 2005;

[0052] 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, welding machine body 4112;

[0053] Cell blanking device 600, first cell blanking device 600a, second cell blanking device 600b; Detailed implementation

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims, and the above drawings of this application are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0056] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. 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 article generally represents an "or" relationship between the associated objects before and after.

[0058] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of sheets" refers to more than two sheets (including two sheets).

[0059] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0061] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand for them is also constantly increasing. In order to meet the market demand, it is necessary to improve the production efficiency of batteries.

[0062] A battery generally includes a housing, an end cap, and battery cells accommodated in the housing. In order to increase the capacity of the battery, at least two battery cells are installed in the housing of the battery. During the production and manufacturing process of the battery, connection tabs need to be connected to the tabs of at least two battery cells so that at least two battery cells are connected in a group, and then they are installed in the housing to form a battery.

[0063] In the description of the embodiments of the present application, a battery cell refers to an electrode assembly. The electrode assembly is the component in the battery where electrochemical reactions occur. The electrode assembly is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the tabs. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the terminal posts to form a current loop.

[0064] In the related art, a battery welding device is usually used to weld a connecting piece to the tabs of at least two battery cells. However, the production capacity of the battery welding device in the related art is limited, resulting in a low welding efficiency of the battery.

[0065] Based on this problem, the present application provides a battery welding device. The battery cell loading device of the battery welding device includes at least two battery cell loading mechanisms. The at least two battery cell loading mechanisms can load at least two battery cell groups, thereby improving the processing capacity of the battery welding device according to the embodiments of the present application and improving the welding efficiency.

[0066] The following will Figures 1 to 5 describe in detail the structure of the battery welding device according to the embodiments of the present application and the battery welding method using the battery welding device.

[0067] Referring to Figure 1 , some embodiments of the present application provide a battery welding device, including a conveyor line 300, a battery 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 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. Each battery cell group includes at least two battery cells. The connecting piece loading device 100 is used to load the connecting piece 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 sequentially convey at least two target carriers to the welding device 400 for welding. The welding device 400 is used to weld the connecting piece and at least two battery cells in the target carrier.

[0068] The conveyor line 300 includes a plurality of carriers arranged in its conveying direction. The plurality of carriers are spaced apart on the conveyor line 300. The conveyor line 300 is movably arranged to drive the plurality of carriers thereon to be conveyed forward together along the conveying direction. A carrier refers to a carrier for clamping or placing a battery cell and / or a connecting piece. In some embodiments, the carrier is a fixture. The plurality of carriers include target carriers. Here, the target carrier refers to the loading target position of the battery cell loading device and the connecting piece loading device. That is to say, a plurality of carriers are arranged at different positions of the conveyor line 300. However, when loading, the battery cell loading device and the connecting piece loading device do not load the battery cell or the connecting piece into any carrier, but load the battery cell and the connecting piece into the set target carrier according to the setting, so that the battery cell and the connecting piece can be welded in the same target carrier.

[0069] 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 on 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 that at least two battery cell groups can be loaded simultaneously. The connecting piece loading device 100 is used to load connecting pieces 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 connect the second pole ears and the first pole ears of at least two battery cells of the battery cell group respectively.

[0070] 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.

[0071] The welding device 400 is used to weld the connecting pieces 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 pieces and the pole ears of at least two battery cells.

[0072] The battery cell loading device 200 of the battery welding equipment of the embodiment of the present application includes at least two battery cell loading mechanisms, so that at least two battery cell groups can be loaded into at least two target carriers on the conveyor line 300 simultaneously. Furthermore, the conveyor line 300 can sequentially convey at least two target carriers containing at least two battery cell groups to the position of the welding device 400, so that at least two battery cell groups are welded by the welding device 400 simultaneously, thereby improving the welding efficiency. Moreover, a plurality of carriers are arranged on the conveyor line 300 of the battery welding equipment of the embodiment of the present application, increasing the buffer capacity, and thereby improving the fault tolerance rate of the equipment.

[0073] In some embodiments, referring to Figure 3 , the battery cell loading device 200 includes a first battery cell loading mechanism 2004 and a second battery cell loading mechanism 2005. And the first battery cell loading mechanism 2004 and the second battery cell loading mechanism 2005 respectively include clamps, and the clamps are used to clamp the battery cells.

[0074] Referring to Figure 1 , in some embodiments, the battery welding equipment includes two welding devices arranged at intervals in the conveying direction of the conveyor line 300. That is, a first welding device 400a and a second welding device 400b. The first welding device 400a is used to weld the first pole ears of at least two battery cells, and the second welding device 400b is used to weld the second pole ears of at least two battery cells. The polarities of the first pole ear and the second pole ear are opposite.

[0075] The fact that two welding devices are arranged at intervals in the conveying direction of the conveying line 300 means that the two welding devices correspond to different positions of the conveying line 300 and are both on the side of the conveying line 300. In a specific embodiment, the first welding device 400a is a brazing device, which is used to weld the copper connecting piece and the first pole ears of at least two battery cells. The second welding device 400b is an aluminum welding device, which is used to weld the aluminum connecting piece and the second pole ears of at least two battery cells.

[0076] The battery welding equipment according to the embodiment of the present application includes two welding devices arranged at intervals in the conveying direction of the conveying line 300. In this way, after the connecting piece and the battery cell group are loaded onto the target carrier, the target carrier can be conveyed forward under the conveying of the conveying line and then sequentially receive the welding of the two welding devices, thereby further improving the welding efficiency.

[0077] In some embodiments, the two welding devices include a brazing device and an aluminum welding device.

[0078] Reference Figure 1 , the first welding device 400a is a brazing device. The second welding device 400b is an aluminum welding device. The first welding device 400a is used to weld the copper connecting piece and the first pole ears of at least two battery cells. The second welding device 400b is used to weld the aluminum connecting piece and the second pole ears of at least two battery cells.

[0079] The two welding devices according to the embodiment of the present application include a brazing device and an aluminum welding device. The brazing device is used to weld the first pole ears of at least two battery cells, and the aluminum welding device is used to weld the second pole ears of at least two battery cells. In this way, as long as the target carrier carrying at least two battery cells is conveyed along the conveying line, the connection of at least two battery cells can be realized, and the efficiency is improved.

[0080] In some embodiments, the connecting piece loading device 100 is used to load two connecting pieces into each target carrier. One of the two connecting pieces is used to connect the first pole ears of at least two battery cells through the first welding device 400a, and the other of the two connecting pieces is used to connect the second pole ears of at least two battery cells through the second welding device 400b.

[0081] The connecting piece loading device 100 is used to convey a plurality of connecting pieces onto the conveying line 300. For each target carrier, the connecting piece loading device 100 places two connecting pieces in each target carrier. Specifically, the two connecting pieces are a copper connecting piece and an aluminum connecting piece respectively. That is to say, in each target carrier, there is a corresponding battery cell group and two connecting pieces. The battery cell group includes at least two battery cells. In this way, one connecting piece is used to connect the first pole ears of at least two battery cells, and the other connecting piece is used to connect the second pole ears of at least two battery cells.

[0082] The connecting piece feeding device 100 according to the embodiment of the present application feeds two connecting pieces to each target carrier to respectively connect the positive and negative electrodes of at least two battery cells, thereby realizing the grouping of at least two battery cells, completing the feeding of the connecting pieces at one time, and improving the production efficiency.

[0083] In some embodiments, referring to Figure 2 , the connecting piece feeding device 100 includes a connecting piece conveying device 1001, a connecting piece storage device 1002, and a grasping device 1003. The connecting piece conveying device 1001 is used to convey a plurality of connecting pieces onto the connecting piece storage device 1002. The grasping device 1003 is used to grasp the connecting pieces from the connecting piece storage device 1002 and place them into the target carrier.

[0084] In some embodiments, each welding device 400 includes a first welding assembly 410 and a second welding assembly 420 arranged adjacent to each other. The target carrier sequentially passes through the first welding assembly 410 and the second welding assembly 420 under the conveyance of the conveying line so that the first pole ears and the second pole ears of at least two battery cells are respectively welded twice.

[0085] As Figure 1 shown, the first welding device 400a includes two welding assemblies arranged adjacent to each other. The second welding device 400b also includes two welding assemblies arranged adjacent to each other. Thus, when the target carrier passes through the first welding device 400a under the conveyance of the conveying line, it will be welded twice by the two welding assemblies in sequence. Specifically, the first pole ears of at least two battery cells and the connecting pieces will first be subjected to the first welding by one welding assembly, and then be subjected to the second welding by the other welding assembly. This enables the negative electrode of the battery to be welded twice, improving the welding yield rate and reducing the number of unqualified batteries caused by poor welding. Similarly, when the target carrier passes through the second welding device 400b under the conveyance of the conveying line, it will also be welded twice by the two welding assemblies in sequence. Specifically, the second pole ears of at least two battery cells and the connecting pieces will first be subjected to the first welding by one welding assembly, and then be subjected to the second welding by the other welding assembly. This enables the positive electrode of the battery to be welded twice, improving the welding yield rate and reducing the number of unqualified batteries caused by poor welding.

[0086] In some embodiments, referring to Figure 1 , the first welding assembly 410 includes at least two welding machines 411 independently arranged. The at least two welding machines 411 are correspondingly arranged with at least two target carriers to respectively weld at least two battery cell groups in the at least two target carriers.

[0087] In Figure 1 the specific embodiment shown, the first welding assembly 410 includes two welding machines 411. Therefore, in Figure 1In the specific embodiment shown, 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 conveys the two target carriers to the welding device 400. In this way, the two welding machines 411 correspond to the two target carriers, and then weld the battery cells and connecting pieces in the two target carriers respectively. That is to say, one welding machine corresponds to one target carrier. In an embodiment not shown in other 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, correspondingly, the first welding assembly 410 includes multiple welding machines 411. The multiple welding machines 411 are used to weld multiple battery cell groups respectively.

[0088] By providing at least two welding machines corresponding to the number of battery cell groups in the first welding assembly 410 of the embodiment of the present application, after the conveyor line conveys at least two battery cell groups to the welding device, the at least two welding machines can work simultaneously to perform the first welding on at least two battery cell groups at the same time, further improving the efficiency.

[0089] The second welding assembly 420 includes at least two independently provided welding machines 411. The at least two welding machines 411 are correspondingly arranged with at least two target carriers to weld at least two battery cell groups in the at least two target carriers respectively. After the first welding assembly 410 completes the first welding of the battery cell groups, the battery cell groups reach the position of the second welding assembly 420 under the conveyance of the conveyor line, so that the second welding assembly 420 performs the second welding on the battery cell groups. Similarly, since the second welding assembly includes at least two independently provided welding machines 411, the second welding assembly can also work simultaneously to perform the second welding on at least two battery cell groups at the same time, further improving the efficiency.

[0090] In some embodiments, the conveyor line 300 includes a circular conveyor line.

[0091] By setting the conveyor line 300 as circular in the battery welding device of the embodiment of the present application, the connecting piece loading device 100, the battery cell loading device 200 and the welding device 400 can be arranged at different positions on the conveyor line 300. In this way, the target carrier can be docked with multiple devices under the conveyance of the conveyor line, and the conveyance direction of the conveyor line can be kept consistent. There is no reciprocating movement in the manufacturing process, avoiding the waiting phenomenon caused by untimely completion of processes, thereby greatly improving the efficiency. Moreover, setting the conveyor line 300 as a circular conveyor line can achieve loading, welding and unloading in a smaller area compared with a straight conveyor line, thereby reducing the volume of the battery welding device.

[0092] In some embodiments, the conveyor line 300 includes a first conveyor section 310 and a second conveyor section 320 that are relatively spaced apart, and a third conveyor section 330 for connecting the first conveyor section 310 and the second conveyor section 320. The battery welding device includes two welding devices that are spaced apart in the conveying direction of the conveyor line 300. The two welding devices are respectively used for welding the first electrode tabs and the second electrode tabs of at least two battery cells. One of the two welding devices is disposed beside the first conveyor section 310, and the other welding device of the two welding devices is disposed beside the second conveyor section 320.

[0093] As Figure 1 shown, the first conveyor section 310 extends along a first direction X, and the second conveyor section 320 also extends along the first direction X. The first conveyor section 310 and the second conveyor section 320 are arranged in parallel and spaced apart. The third conveyor section 330 is disposed between the first conveyor section 310 and the second conveyor section 320 and the third conveyor section 330 extends along a second direction Y, and the first direction X and the second direction Y are perpendicular to each other. The first welding device 400a is disposed beside the first conveyor section 310, and the second welding device 400b is disposed beside the second conveyor section 320.

[0094] By providing the third conveyor section 330 between the first conveyor section 310 and the second conveyor section 320, after the battery cell group is welded by the first welding device 400a on the first conveyor section 310, it can be directly conveyed to the second conveyor section 320 through the third conveyor section 330 to be welded by the second welding device 400b. Such an arrangement enables the welding process of the battery cell group to be carried out without transfer, and only the conveying action of the conveyor line 300 needs to be controlled, and the control process is simple.

[0095] In some embodiments, the conveyor line 300 further includes a fourth conveyor section 340 that is disposed opposite to 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 connected in sequence to form a closed loop conveyor line. The conveyor line 300 forms a closed loop conveyor line. In this way, when the carrier carrying the battery cell group is unloaded after welding, the empty carrier can continue to return to the loading position along with the conveying of the conveyor line, and then the connecting piece loading device 100 and the battery cell loading device 200 can continue to load the empty carrier, so that the battery welding device of the embodiment of the present application can continuously operate and improve the operation efficiency.

[0096] In some embodiments, the battery welding device further includes a battery cell unloading device 600. The battery cell unloading device 600 is docked with the conveyor line 300 to unload the welded battery cell group. This enables the battery welding device of the embodiment of the present application to cover the entire process of loading, welding, and unloading.

[0097] As Figure 1As shown, the battery cell blanking device 600 extends along the second direction Y. After the battery cell group completes the welding of the second tab and the first tab, it continues to be conveyed forward under the conveyance of the conveyor line 300. After being conveyed to the position of the battery cell blanking device 600, the battery cell group completes blanking through the battery cell blanking device 600. The setting of the battery cell blanking device 600 enables the blanking operation of the battery welding equipment to be automated.

[0098] In some embodiments, the battery welding equipment includes at least two battery cell blanking devices. The at least two battery cell blanking devices are spaced apart in the conveying direction of the conveyor line 300 to blank the welded battery cell groups in at least two target carriers.

[0099] Figure 1 Exemplarily, it is shown that the battery welding equipment includes a first battery cell blanking device 600a and a second battery cell blanking device 600b. The first battery cell blanking device 600a is used to blank the battery cell group in one target carrier, and the second battery cell blanking device 600b is used to blank the battery cell group in another target carrier.

[0100] The battery welding equipment of the embodiments of the present application includes at least two target carriers. Therefore, in order to blank the battery cell groups in at least two target carriers under the conveyance of the conveyor line, the battery welding equipment of the embodiments of the present application is provided with at least two battery cell blanking devices.

[0101] In some embodiments, the conveyor line includes a magnetic drive conveyor line. The magnetic drive conveyor line has advantages such as flexible, high-speed, and stable conveyance, and is applied to the product production and manufacturing process, which can greatly improve the product manufacturing efficiency.

[0102] In some embodiments, the conveyor line is configured to convey step by step in its conveying direction. The conveyor line being configured to convey step by step in its conveying direction means that the conveyor line advances step by step at a set distance in the conveying direction. That is to say, the distance of each step is determined. For example, the conveyor line can be a step-by-step conveyor line. The conveyor line of the present application is configured to convey step by step so that the conveyor line drives the carriers thereon to move forward by a fixed distance in sections. Specifically, every time the conveyor line moves, all the carriers on the conveyor line will move forward by two positions.

[0103] The conveyor line of the embodiments of the present application is configured to convey step by step, which is beneficial to improving the control accuracy of the positions reached by the carriers.

[0104] Reference Figure 5 , the embodiments of the present application also provide a battery welding method, including the following steps:

[0105] S510, loading a plurality of connecting pieces into at least two target carriers;

[0106] S520, Load at least two battery cell groups into at least two target carriers, where each battery cell group includes at least two battery cells;

[0107] S530, Control the conveyor line 300 to convey at least two target carriers to the welding device 400; and

[0108] S540, Control the welding device 400 to operate to weld the connecting pieces and at least two battery cells in the target carrier.

[0109] In the battery welding method according to the embodiment of the present application, at least two battery cell groups are loaded into at least two target carriers of the conveyor line 300. Then, the conveyor line 300 can sequentially convey at least two target carriers loaded with at least two battery cell groups to the position of the welding device 400, so that at least two battery cell groups are sequentially welded by the welding device 400, thereby improving the welding efficiency.

[0110] In some embodiments, the battery welding method further includes, before controlling the conveyor line to operate to convey 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 operate; if it is detected that there is no battery cell group in the target carrier, first control the battery cell loading mechanism to load the battery cell group into the target carrier and then control the conveyor line 300 to convey. 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 conveyed to the welding device, thereby ensuring the smooth progress of welding. This can avoid repeated rework caused by missed placement and improve work efficiency.

[0111] In some embodiments, the battery welding equipment includes a first welding device 400a and a second welding device 400b that are spaced apart in the conveying direction of the conveyor line 300. Controlling the conveyor line to convey at least two target carriers to the welding device for welding, and the welding device 400 for welding the connecting pieces and at least two battery cells in the target carrier includes: 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 operate to weld the first tabs 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 operate to weld the second tabs of at least two battery cells in the target carrier.

[0112] Reference Figure 1, the target vehicle first arrives at the first welding device 400a under the conveyance of the conveyor line 300 for welding the first tab. After the welding is completed, the target vehicle arrives at the second welding device 400b under the conveyance of the conveyor line 300 for welding the second tab. After the tab welding is completed, the battery cell group of the target vehicle will be unloaded through the battery cell unloading device 600. Of course, in some other embodiments, the target vehicle may also first perform the welding of the second tab under the conveyance of the conveyor line 300, and then perform the welding of the first tab under the conveyance of the conveyor line 300. The welding sequence of the tabs is not limited herein.

[0113] In some embodiments, each welding device 400 includes a first welding assembly 410 and a second welding assembly 420 arranged adjacent to each other. Controlling the welding device 400 to work for welding the connecting piece and at least two battery cells in the target vehicle includes: controlling the target vehicle to sequentially pass through the first welding assembly 410 and the second welding assembly 420 under the conveyance of the conveyor line so that the first tabs and / or the second tabs of at least two battery cells are welded twice respectively.

[0114] The battery welding method of the embodiment of the present application performs two weldings on the first tab and the second tab of the battery cell group respectively, thereby improving the welding yield rate and reducing the number of unqualified batteries caused by poor welding.

[0115] Next, according to Figures 1 to 4 a detailed description will be given of the structure and working process of the battery welding equipment of a specific embodiment of the present application.

[0116] As Figure 1 shown, 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 400a, a second welding device 400b, a first battery cell unloading device 600a, and a second battery cell unloading device 600b.

[0117] The conveyor line 300 is a circular conveyor line, including 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 at intervals. The third conveying section 330 is arranged between the first conveying section 310 and the second conveying section 320. The fourth conveying section 340 is arranged between the second conveying section 320 and the first conveying section 310. In this way, 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.

[0118] The connecting piece loading device 100, the battery cell loading device 200, the first battery cell unloading device 600a, and the second battery cell unloading device 600b are respectively docked with different positions of the conveyor line 300 to achieve loading and unloading.

[0119] In this embodiment, the connecting piece feeding device 100 is used to feed connecting pieces into two target carriers among a plurality of carriers. Specifically, for each target carrier, the connecting piece feeding device 100 feeds two connecting pieces into the target carrier. The two connecting pieces include a first connecting piece and a second connecting piece. Specifically, the first connecting piece includes a copper connecting piece. The second connecting piece includes an aluminum connecting piece.

[0120] As Figure 2 shown, the connecting piece feeding device 100 includes a connecting piece conveying device 1001, a connecting piece storage device 1002, a grasping device 1003, a positioning mechanism 1004, and a connecting piece feeding mechanism 1005. Among them, the connecting piece conveying device 1001 is used to transfer a tray containing copper connecting pieces and aluminum connecting pieces onto the connecting piece storage device 1002. The grasping device 1003 (such as a robot) takes one copper connecting piece and one aluminum connecting piece from the connecting piece storage device 1002 according to a preset path and places them on the positioning mechanism 1004. Then, the positioning mechanism 1004 is controlled to move horizontally, and the copper connecting piece and the aluminum connecting piece in the positioning mechanism 1004 are taken away by the connecting piece feeding mechanism 1005, moved horizontally, and placed into the target carrier, completing the connecting piece feeding process.

[0121] The battery cell feeding device 200 is used to feed two battery cell groups into two target carriers among a plurality of carriers. Specifically, for each target carrier, the battery cell feeding device 200 feeds one battery cell group into the target carrier. Each battery cell group includes two battery cells. In this way, after the connecting piece feeding device 100 and the battery cell feeding device 200 both complete the feeding, each target carrier carries two battery cells and two connecting pieces. The battery cell here refers to an electrode assembly. Each battery cell includes a first tab and a second tab with opposite polarities.

[0122] As Figure 3 shown, the battery cell feeding device 200 includes two battery cell feeding mechanisms. The two feeding mechanisms include a first battery cell feeding mechanism 2004 and a second battery cell feeding mechanism 2005. Specifically, the battery cell feeding device 200 further 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 feeding belt respectively and place the two battery cells on the transfer platform 2003. The first battery cell feeding mechanism 2004 and the second battery cell feeding mechanism 2005 take the battery cells on the transfer platform 2003 and place the battery cells into the target carrier containing the connecting pieces, completing the battery cell feeding process.

[0123] The first welding device 400a is used to connect two first tabs of two battery cells by using a first connecting piece. Specifically, the first connecting piece is welded 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 by using a second connecting piece. Specifically, the second connecting piece is welded to the two second tabs of the two battery cells.

[0124] After the connection of the two battery cells is completed, the target carrier continues to be conveyed under the conveyance of the conveyor line 300. After being conveyed to a position where it is docked with the battery cell unloading device 600, the battery cell unloading device 600 unloads the welded battery cell group. Then the empty carrier continues to return to the loading position under the conveyance of the conveyor line 300.

[0125] There are two target carriers provided on the conveyor line 300 in this embodiment. In this way, when the conveyor line conveys, the two target carriers will be conveyed to the first welding device 400a at the same time. As Figure 1 shown, the first welding device 400a includes four welding machines. Two of the welding machines form a first welding assembly, and the other two welding machines form a second welding assembly. After the two target carriers reach the first welding device 400a, the two target carriers are correspondingly arranged with the two welding machines of the first welding assembly. In this way, the two welding machines of the first welding assembly can respectively perform the first welding on the first tabs and the connecting pieces of the battery cell groups in the two target carriers. After the first welding is completed, the conveyor line 300 moves forward two positions, so that the two target carriers are correspondingly arranged with the two welding machines of the second welding assembly. In this way, the two welding machines of the second welding assembly can respectively perform the second welding on the first tabs and the connecting pieces of the battery cell groups in the two target carriers, thereby avoiding the problem of incomplete welding and improving the welding quality.

[0126] After the welding of the first tabs of the two battery cell groups is completed, the conveyor line 300 continues to move forward, thereby driving 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 welding machines 411. Two of the welding machines form a first welding assembly, and the other two welding machines form a second welding assembly. Its working process is similar to that of the first welding device 400a and will not be elaborated here. The difference is that the welding machines of the first welding device 400a weld the two second tabs of the two battery cells of the battery cell group. Specifically, the welding machines of the first welding device 400a are all copper welding machines, and the welding machines of the second welding device 400b are all aluminum welding machines.

[0127] As Figure 4As shown in the figure, the welding machine 411 includes a welding machine body 4112 and a moving device 4111. The moving device 4111 is used to drive the welding machine body 4112 to move in the second direction Y. When there is a welding requirement for the battery cells and connection plates in the target carrier, the moving device 4111 will carry the welding machine body 4112 and traverse it to the welding position for the welding machine body 4112 to perform the welding work. After the welding is completed, the moving device 4111 will carry the welding machine body 4112 and traverse it back to the initial position to wait for the next welding instruction. The structures of multiple welding machines are the same.

[0128] A plurality of carriers are arranged on the conveyor line 300. The carriers are used to carry and place the battery cell groups and connection plates to be welded. In a specific embodiment, the conveyor line 300 is a magnetic drive circulating line assembly, and eleven groups of carriers are arranged on the conveyor line 300. One side of the first conveying section 310 is the side for loading connection plates and battery cells. Taking two carriers as a group. Each time the magnetic drive moves forward, all the carriers on the conveyor line 300 will move forward two positions. After the connection plates and batteries are loaded, the magnetic drive moves forward to the first welding device 400a to complete two copper welding operations. After the two carriers are copper welded, they are moved from the third conveying section 330 to the second conveying section 320, and the second welding device 400b performs aluminum welding work.

[0129] As Figure 1 shown, after the welding work is completed, the two carriers are driven forward by the magnetic drive to the unloading position. The first battery cell unloading device 600a transfers the battery cell group in one carrier to the next working station to complete the battery transfer and unloading process. The empty carrier and another full-load carrier are then moved by the fourth conveying section 340 to another unloading position. The second battery cell unloading device 600b transfers the battery cells in the other carrier to the next working station to complete the unloading process. After the unloading is completed, the empty carrier continues to move forward with the conveyor line 300 to perform a new round of loading process.

[0130] The battery welding device of this embodiment can realize the functions of feeding the battery cells from the feeding conveyor belt, completing the welding requirements, and finally flowing out for transfer. The specific process is as follows: As Figure 1 and Figure 2 shown, first, the connection plate loading device 100 transfers the connection plates from the connection plate loading tray to two target carriers on the conveyor line 300 after secondary positioning. Then, the battery cell loading device 200 places two battery cell groups on the feeding production line into two target carriers on the conveyor line 300. The conveyor line 300 is responsible for transporting the target carriers loaded with connection plates and battery cell groups to move forward two carrier positions in sequence for copper welding, and continue to transport forward for aluminum welding. After completion, the target carriers loaded with battery cell groups are transported by the conveyor line 300 to the unloading position for the unloading process. After the unloading is completed, the empty carriers are transported by the conveyor line 300 to the connection plate loading position to perform a new round of operation process.

[0131] In the cell loading device 200 of this embodiment, a total of two sets of cell loading mechanisms are designed, which can process two cell groups, that is, four batteries at the same time, thereby improving the processing capacity, accelerating the production efficiency, and increasing the equipment output.

[0132] At the same time, for the connection between each cell group and the connecting piece, two copper welds and aluminum welds are required, which improves the welding yield rate and reduces the number of NG batteries caused by poor welding. Moreover, a total of eleven sets of carriers are designed for the conveyor line 300, and at most eleven sets, that is, twenty-two batteries, are allowed to be cached at the same time, increasing the cache capacity and providing the equipment fault tolerance rate.

[0133] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery welding device, comprising: A conveyor line (300), including a plurality of carriers arranged in its conveying direction; A battery cell loading device (200), including at least two battery cell loading mechanisms (2004, 2005), and the at least two battery cell loading mechanisms (2004, 2005) are respectively used to load at least two battery cell groups into at least two target carriers of the conveyor line (300), and each of the battery cell groups includes at least two battery cells; A connecting piece loading device (100), used to load connecting pieces into the at least two target carriers; And A welding device (400), arranged beside the conveyor line (300), and the conveyor line (300) is movably arranged to sequentially convey the at least two target carriers to the welding device (400) for welding, and the welding device (400) is used 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 (400a, 400b) spaced apart in the conveying direction of the conveyor line (300), the two welding devices (400a, 400b) include a first welding device (400a) and a second welding device (400b), the first welding device (400a) is used to weld the first pole ears of the at least two battery cells, the second welding device (400b) is used to weld the second pole ears of the at least two battery cells, and the polarities of the first pole ear and the second pole ear are opposite.

3. The battery welding device according to claim 2, wherein, The first welding device (400a) includes a brazing device; and / or, the second welding device (400b) includes an aluminum welding device.

4. The battery welding device according to claim 2 or 3, wherein, The connecting piece loading device (100) is used to load two connecting pieces into each target carrier, one of the two connecting pieces is used to connect the first pole ears of the at least two battery cells through the first welding device (400a), and the other of the two connecting pieces is used to connect the second pole ears of the at least two battery cells through the second welding device (400b).

5. The battery welding device according to any one of claims 2 to 4, wherein, Each welding device (400) includes a first welding component (410) and a second welding component (420) arranged adjacent to each other, and the target carrier sequentially passes through the first welding component (410) and the second welding component (420) under the conveyance of the conveyor line (300) 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 (410) includes at least two welding machines (411) independently arranged, and the at least two welding machines (411) are arranged corresponding to the at least two target carriers to respectively weld at least two battery cell groups in the at least two target carriers; and / or, The second welding component (420) includes at least two welding machines (411) independently arranged, and the at least two welding machines (411) are arranged corresponding to the at least two target carriers to respectively weld at least two battery cell groups in the at least two target carriers.

7. The battery welding device according to any one of claims 1 to 6, wherein, The conveyor line (300) includes a circular conveyor line.

8. The battery welding device according to claim 7, wherein, The conveyor line (300) includes a first conveyor section (310) and a second conveyor section (320) that are relatively spaced apart, and a third conveyor section (330) for connecting the first conveyor section (310) and the second conveyor section (320). The battery welding device includes two welding devices (400a, 400b) that are spaced apart in the conveying direction of the conveyor line (300). The two welding devices (400a, 400b) are respectively used for welding the first tab and the second tab of the at least two battery cells. One of the two welding devices is arranged beside the first conveyor section (310), and the other welding device of the two welding devices is arranged beside the second conveyor section (320).

9. The battery welding device according to claim 8, wherein, The conveyor line (300) further includes a fourth conveyor section (340) that is arranged opposite to 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 connected in sequence to form a closed loop conveyor line.

10. The battery welding device according to any one of claims 1 to 9, wherein the battery welding device further includes a battery cell unloading device (600), and the battery cell unloading device (600) is docked with the conveyor line (300) to unload the welded battery cell group.

11. The battery welding device according to claim 10, wherein the battery welding device includes at least two battery cell unloading devices (600a, 600b), and the at least two battery cell unloading devices (600a, 600b) are spaced apart in the conveying direction of the conveyor line (300) to unload the welded battery cell groups in the at least two target carriers.

12. The battery welding device according to any one of claims 1 to 11, wherein, The connecting tab feeding device (100) includes a connecting tab conveying device (1001), a connecting tab storage device (1002), and a grasping device (1003). The connecting tab conveying device (1001) is used for conveying a plurality of connecting tabs onto the connecting tab storage device (1002), and the grasping device (1003) is used for grasping the connecting tabs from the connecting tab storage device (1002) and placing them into the target carrier.

13. A battery welding method based on the battery welding device according to claim 1, comprising the following steps: Feeding a plurality of connecting tabs into at least two target carriers; Correspondingly feeding at least two battery cell groups into at least two target carriers, each battery cell group including at least two battery cells; Controlling the conveyor line to act to sequentially convey the at least two target carriers to the welding device; And Controlling the welding device (400) to operate to weld the connecting tabs and the at least two battery cells in the target carrier.

14. The battery welding method according to claim 13, wherein the battery welding method further includes, before controlling the conveying line to act 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, controlling the conveying line to act; if it is detected that no battery cell group is placed in the target carrier, first controlling the battery cell feeding mechanism to feed the battery cell group into the target carrier and then controlling the conveying line (300) to convey.

15. The battery welding method according to claim 13 or 14, wherein the battery welding equipment comprises a first welding device (400a) and a second welding device (400b) which are arranged at intervals in the conveying direction of the conveying line (300), and the conveying line is controlled to convey the at least two target carriers to the welding device for welding. The welding device (400) for welding the connecting piece and at least two battery cells in the target carrier comprises: Controlling the conveying line to convey the 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 conveying line to convey the 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.

16. The battery welding method according to any one of claims 13 to 15, each of the welding devices (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 connection piece and at least two battery cells in the target vehicle includes: Controlling the target carrier to sequentially pass through the first welding assembly (410) and the second welding assembly (420) under the conveyance of the conveying line so that the first pole ears and / or the second pole ears of the at least two battery cells are respectively welded twice.

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