End cover welding device, battery assembly system, assembly method and battery monomer

Abstract

The invention provides a single battery end cover welding device, an assembling method and a single battery, the single battery comprises a shell and an end cover, the end cover is arranged at one end of the shell, and a first connecting seam and a second connecting seam which are arranged in the circumferential direction of the shell are formed in the connecting position of the shell and the end cover; the end cover welding device comprises a material conveying assembly and a welding assembly. The material conveying assembly comprises a material conveying line, a first clamp and a second clamp, and the first clamp and the second clamp are arranged on the same material conveying line in a spaced mode. The first clamp is used for fixing the shell and making the first connecting seam visible; the second clamp is used for fixing the shell and making the second connecting seam visible; the welding assembly is arranged along the material conveying line and used for welding the first connecting seam when the first clamp fixed with the single battery is conveyed to the welding assembly and welding the second connecting seam when the second clamp fixed with the single battery is conveyed to the welding assembly.

Description

Technical Field

[0001] The present application relates to the field of battery processing, and particularly to an end cap welding device, a battery assembly system, an assembly method, and a battery cell. Background Art

[0002] With the development of battery technology, battery cells are applied in more and more fields and gradually replace traditional petrochemical energy in the field of automotive power. A battery cell can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery cell, after discharging, the active substances can be activated by charging and continue to be used.

[0003] In the process of mass production of battery cells, an end cap welding device for battery cells is often required. However, the current end cap welding devices have the problem of high cost.

[0004] In addition, the above statements are only used to provide background technical information related to the present application, and do not necessarily constitute prior art. Summary of the Invention

[0005] In view of the above problems, the present application provides an end cap welding device, an assembly method, and a battery cell for battery cells, which can reduce the manufacturing cost of the end cap welding device for battery cells.

[0006] An embodiment of the present application provides an end cap welding device for a battery cell. The battery cell includes a housing and an end cap. The end cap is disposed at one end of the housing. A first connection seam and a second connection seam are provided at the connection between the housing and the end cap along the circumferential direction of the housing. The end cap welding device includes a feeding assembly and a welding assembly: The feeding assembly includes a feeding line, a first fixture, and a second fixture. The first fixture and the second fixture are spaced apart on the same feeding line; The first fixture is configured to fix the housing and expose the first connection seam; The second fixture is configured to fix the housing and expose the second connection seam; The welding assembly is disposed along the feeding line and is configured to weld the first connection seam when the first fixture fixing the battery cell is conveyed to the welding assembly, and is configured to weld the second connection seam when the second fixture fixing the battery cell is conveyed to the welding assembly.

[0007] In the above manner, when the battery cell is placed in the first fixture, the welding assembly can weld the first connection seam, and when the battery cell is placed in the second fixture, the welding assembly can weld the second connection seam. Thus, the welding assembly can be used to weld both the first connection seam and the second connection seam, thereby reducing the manufacturing cost of the end cap welding device.

[0008] In some embodiments, the end cap welding device includes a steering assembly, which is arranged along the feeding line and spaced apart from the welding assembly; the feeding line is used to transport the first clamp and the second clamp from the welding assembly to the steering assembly, and then transport them to the welding assembly after passing through the steering assembly; the steering assembly is used to remove the battery cell after welding the first connecting seam from the corresponding first clamp and turn it, and place it on the second clamp after turning; or, the steering assembly is used to remove the battery cell after welding the second connecting seam from the corresponding second clamp and turn it, and place it on the first clamp after turning.

[0009] In the above manner, the steering assembly can place the battery cell placed in the first fixture to the second fixture or place the battery cell placed in the second fixture to the first fixture. When the battery cell is placed in the first fixture, the first connection seam can be welded, and when it is placed in the second fixture, the second connection seam can be welded. In addition, the welding of the first connection seam and the second connection seam can be completed by the same welding assembly, thereby reducing the cost of the welding device.

[0010] In some embodiments, the steering assembly includes a support frame, a clamping mechanism and a steering motor; the support frame is arranged on the outside of the feed line, the clamping mechanism is located above the feed line, and is rotatably supported on the support frame; the steering motor is transmission-connected to the clamping mechanism, and is used to drive the clamping mechanism to rotate relative to the support frame for steering; the clamping mechanism is used to clamp the battery cell and steer the battery cell.

[0011] Through the above method, the steering motor can drive the clamping claw mechanism holding the battery cell to rotate, thereby realizing the steering of the battery cell.

[0012] In some embodiments, the steering assembly includes a lifting frame and a lifting motor. The lifting frame can be lifted and lowered on the supporting frame, and the clamping mechanism is rotatably arranged on the lifting frame; the lifting motor is arranged on the supporting frame or the lifting frame and is transmission-connected to the lifting frame for driving the lifting frame to rise and fall relative to the supporting frame.

[0013] In the above manner, the steering assembly can take the battery cell out of the first clamp or the second clamp and then steer it, thereby reducing the possibility of interference between the battery cell and other devices during the steering process.

[0014] In some embodiments, the material feeding line includes a first conveying sub-line, a second conveying sub-line, a first transfer mechanism, and a second transfer mechanism; the first conveying sub-line and the second conveying sub-line are arranged side by side, and the conveying directions of the first conveying sub-line and the second conveying sub-line are opposite; the first transfer mechanism is arranged at one end of the first conveying sub-line and the second conveying sub-line for transferring the first fixture and the second fixture from the first conveying sub-line to the first conveying sub-line; the second transfer mechanism is arranged at the other end of the first conveying sub-line and the second conveying sub-line for transferring the first fixture and the second fixture from the second conveying sub-line to the first conveying sub-line; the welding assembly is arranged along the first conveying sub-line, and the turning assembly is arranged along the second conveying sub-line.

[0015] In the above manner, the first fixture and the second fixture can move cyclically along with the material feeding line, so that the end cap welding device can continuously perform the assembly and welding of battery cells cyclically. In addition, the welding assembly and the turning assembly are arranged in different areas, which is beneficial for users to observe and maintain the welding device.

[0016] In some embodiments, the welding assembly includes a first welding mechanism and a second welding mechanism, and the first welding mechanism and the second welding mechanism are arranged at intervals along the material feeding line; the first welding mechanism is used for pre-welding the first joint or the second joint, and the second welding mechanism is used for further welding the first joint or the second joint after pre-welding.

[0017] In the above manner, the welding quality can be improved.

[0018] In some embodiments, the first welding mechanism includes two pre-welding mechanisms, and the two pre-welding mechanisms are oppositely arranged on both sides of the material feeding line; the second welding mechanism includes two full-welding mechanisms, and the two full-welding mechanisms are oppositely arranged on both sides of the material feeding line; the two pre-welding mechanisms are used for pre-welding the respective parts of the first joint or the second joint facing them, and the two full-welding mechanisms are used for full-welding the respective parts of the first joint or the second joint facing them.

[0019] In the above manner, the two first joints / the two second joints can be welded simultaneously, thereby improving the welding efficiency.

[0020] In some embodiments, the second welding mechanism is used for performing the first welding on the first joint or the second joint after pre-welding from the first direction, and performing the second welding on the first joint or the second joint after the first welding from the second direction, and the first direction and the second direction are opposite.

[0021] In the above manner, the welding quality can be improved, and the problem of insufficient weld pool of the welding wire can be improved.

[0022] In some embodiments, the welding assembly includes at least one full-welding mechanism, and the full-welding mechanism is used for full-welding the first joint or the second joint.

[0023] In the above manner, the use of the pre-welding mechanism can be reduced, thereby reducing the manufacturing cost.

[0024] In some embodiments, the end-cap welding device includes a rolling component, which is spaced apart from the welding component and is used to roll the battery cell after being welded by the welding component, so as to roll the solder on the first connection seam or the second connection seam.

[0025] In the above manner, the weld seams of the first connection seam and the second connection seam can be shaped, improving the surface quality of the weld seams.

[0026] In some embodiments, the rolling component includes two rolling mechanisms, which are oppositely arranged on both sides of the feeding line; the two rolling mechanisms are used to press against the battery cell from both sides of the feeding line to roll the first connection seam or the second connection seam, as well as the flanging of the end cap extending beyond the housing.

[0027] In the above manner, the weld seams of the first connection seam and the second connection seam and the end cap can be shaped to improve the surface quality of the battery cell.

[0028] In some embodiments, each rolling mechanism includes a bracket and two rollers. The bracket is arranged outside the feeding line, and the two rollers are spaced apart along the extension direction of the feeding line on the bracket, so that the battery cell can pass through the two rollers in sequence; the two rollers are rotatably arranged on the bracket to roll the battery cell.

[0029] In the above manner, the two rollers can perform secondary rolling and shaping on the weld seams of the first connection seam and the second connection seam, further improving the surface quality of the weld seams.

[0030] In some embodiments, the end-cap welding device includes a welding slag cleaning component, which is spaced apart from the welding component along the feeding line and is used to clean the welding slag on the battery cell after being welded by the welding component, so that the welding slag is separated from the battery cell.

[0031] In the above manner, the possibility of foreign matters such as welding slag remaining on the battery cell can be reduced.

[0032] In some embodiments, the end-cap welding device includes a press-fitting component, which is spaced apart from the welding component along the feeding line. The press-fitting component is used to press-fit the housing and the end cap before the battery cell is conveyed to the welding component; the welding component is used to weld the battery cell after being press-fitted.

[0033] In the above manner, the press-fitting component can press the end cap and the housing together, thereby reducing the possibility of misalignment during their assembly.

[0034] In some embodiments, the end cap welding device includes a feeding assembly, which is arranged at an interval from the feeding line. The feeding assembly is used to place the battery cells to be fed and welded onto the first fixture or the second fixture.

[0035] In the above manner, the end cap welding device can achieve automatic feeding.

[0036] In some embodiments, the feeding assembly includes a storage mechanism and a feeding mechanism. The storage mechanism is used to store the battery cells to be fed and welded; the feeding mechanism is arranged along the feeding line and is used to take out the corresponding battery cells from the storage mechanism and place the battery cells onto the first fixture or the second fixture.

[0037] In the above manner, the end cap welding device can be used for assembling a batch of battery cells.

[0038] In some embodiments, the storage mechanism is used to store the battery cells in a predetermined placement posture relative to the feeding line. The feeding mechanism is used to take out the battery cells in the predetermined placement posture from the storage mechanism and convey the battery cells to the first fixture while maintaining the predetermined placement posture, and the predetermined placement posture is consistent with the fixed posture required by the first fixture.

[0039] In the above manner, the feeding efficiency of the feeding assembly can be improved.

[0040] In some embodiments, the end cap welding device includes a discharging assembly, which is arranged at an interval from the feeding line. The discharging assembly is used to take out the battery cells that have completed welding from the feeding line and convey them outwards.

[0041] In the above manner, the end cap welding device can automatically discharge materials.

[0042] In some embodiments, the discharging assembly includes a moving mechanism and a conveying mechanism. The moving mechanism is arranged along the feeding line and is used to move the battery cells that have completed welding from the feeding line to the conveying mechanism. The conveying mechanism is used to convey the corresponding battery cells outwards.

[0043] In the above manner, the end cap welding device can discharge materials through the moving mechanism and the conveying mechanism independent of the feeding line, reducing the possibility of the feeding line stopping due to discharging materials.

[0044] In some embodiments, the conveying mechanism includes a first conveying sub-mechanism and a second conveying sub-mechanism. The moving mechanism is used to move the battery cells that have completed welding and passed the inspection from the feeding line to the first conveying sub-mechanism, and move the battery cells that have completed welding and failed the inspection from the feeding line to the second conveying sub-mechanism; the first conveying sub-mechanism and the second conveying sub-mechanism are used to convey the battery cells carried by them outwards respectively.

[0045] In the above manner, it is possible to separately discharge the qualified and unqualified battery cells, which is conducive to the recycling of unqualified battery cells and the post-treatment of qualified battery cells.

[0046] In some embodiments, the first conveying sub-mechanism includes a first pulling belt mechanism and a second pulling belt mechanism. The first pulling belt mechanism and the second pulling belt mechanism can move relative to the transfer mechanism, can move between the handling position and the output position, and the first pulling belt mechanism and the second pulling belt mechanism are used to move to or away from the output position; the first pulling belt mechanism and the second pulling belt mechanism store the battery cells transferred by the transfer mechanism at the output position; the first pulling belt mechanism and / or the second pulling belt mechanism are used to store battery cells and move to the output position to output a corresponding pair of battery cells after a pair of battery cells are successfully paired.

[0047] In the above manner, the first pulling belt mechanism and the second pulling belt mechanism work simultaneously, which is conducive to improving the efficiency of paired discharging.

[0048] In some embodiments, the first pulling belt mechanism includes a first conveying pulling belt and a first buffer pulling belt; the second pulling belt mechanism includes a second conveying pulling belt and a second buffer pulling belt; the first conveying pulling belt and the first buffer pulling belt are arranged side by side, and the second conveying pulling belt and the second buffer pulling belt are arranged side by side; the first conveying pulling belt and the second conveying pulling belt are arranged side by side and at intervals, and are located on both sides of the output position; the first conveying pulling belt and the first buffer pulling belt can move together towards or away from the output position; the second conveying pulling belt and the second buffer pulling belt can move together towards or away from the output position; the first buffer pulling belt and the second buffer pulling belt are respectively used to buffer another battery cell to be paired when a battery cell to be paired is transferred to the second pulling belt mechanism; the first conveying pulling belt and the second conveying pulling belt are respectively used to store the battery cells to be paired; when the first buffer pulling belt buffers a battery cell, the battery cell stored on the first conveying pulling belt is paired with the battery cell buffered on the first buffer pulling belt; when the second buffer pulling belt buffers a battery cell, the battery cell stored on the second conveying pulling belt is paired with the battery cell buffered on the second buffer pulling belt; when the first buffer pulling belt does not buffer a battery cell and the second buffer pulling belt does not buffer a battery cell, the battery cell stored on the first conveying pulling belt is paired with the battery cell stored on the second conveying pulling belt.

[0049] In the above manner, it is possible to improve the pairing efficiency during the discharging process and reduce the risk of delaying the paired discharging due to either the first conveying pulling belt or the second conveying pulling belt not storing qualified battery cells.

[0050] In some embodiments, the end cap welding device includes a post-welding detection component. The post-welding detection component is arranged along the material conveying line between the welding component and the transfer mechanism, and the post-welding detection component is used to detect whether the battery cells that have been welded are qualified.

[0051] In the above manner, qualified and unqualified battery cells can be efficiently identified through the post-welding detection assembly.

[0052] In some embodiments, the first fixture includes a first carrying mechanism and a first retaining member. The first carrying mechanism is used to carry the battery cell, and the first retaining member is arranged on the first carrying mechanism to position the battery cell carried on the first carrying mechanism; the second fixture includes a second carrying mechanism and a second retaining member; the second carrying mechanism is used to carry the battery cell, and the second retaining member is arranged on the second carrying mechanism to position the battery cell carried on the second carrying mechanism.

[0053] In the above manner, by positioning the battery cell, the possibility of the battery cell shaking during the assembly process is reduced.

[0054] In some embodiments, the first fixture further includes two first side fasteners which are arranged oppositely and used to pre-limit the battery cell carried on the first carrying mechanism and located between the two first side fasteners. The second fixture further includes two second side fasteners which are arranged oppositely and used to pre-limit the battery cell carried on the second carrying mechanism and located between the two first side fasteners.

[0055] In the above manner, the first side fasteners and the second side fasteners can enable the battery cell to be arranged on the first carrying mechanism and the second carrying mechanism in a substantially upright manner, reducing the possibility of the battery cell toppling over.

[0056] In some embodiments, the first fixture further includes a first base, and the first carrying mechanism is slidably arranged on the first base. The sliding direction of the first carrying mechanism is perpendicular to the conveying direction of the feeding line; the second fixture further includes a second base, and the second carrying mechanism is slidably arranged on the second base. The sliding direction of the second carrying mechanism is perpendicular to the conveying direction of the feeding line.

[0057] In the above manner, the first carrying mechanism and the second carrying mechanism can be moved along the direction perpendicular to the conveying direction of the feeding line, so that the battery cell can be moved to a suitable area to be processed in any step of the assembly process.

[0058] In some embodiments, the housing includes two first side walls arranged oppositely and two second side walls arranged oppositely, and the two first side walls and the two second side walls are arranged alternately along the circumferential direction of the housing; the first connection seam is located between the two first side walls along the circumferential direction of the housing, and the second connection seam is located between the two second side walls along the circumferential direction of the housing.

[0059] In the above manner, the end cap welding device can be used for assembling the prismatic battery cell.

[0060] One embodiment of the present application also provides a battery assembly system, the battery comprising a shell, an end cover and an electrode assembly; the shell has an open end, a pole is arranged on the wall of the shell opposite to the open end, the pole has a through hole, and the shell and the end cover are connected to form a accommodating chamber connected to the through hole; the active material coating portion of the electrode assembly is arranged in the shell, and the pole ear portion of the electrode assembly is connected to the side of the pole away from the accommodating chamber through the through hole; the battery assembly system comprises a conveying device and an assembly device, the conveying device is used to convey the structure to be assembled to each station of the assembly equipment; the stations of the assembly equipment at least include a pole ear welding device, a shell insertion device, a pole ear piercing device, a pole column welding device and an end cover welding device; wherein the pole ear welding device is used to weld multiple pole ear sheets of the electrode assembly to form a pole ear portion; the shell insertion device is used to load the electrode assembly into the shell from the open end; the pole ear piercing device is used to clamp the pole ear portion through the through hole when the electrode assembly is loaded into the shell; the pole column welding device is used to weld the pole ear portion passing through the through hole to the side of the pole away from the accommodating chamber.

[0061] An embodiment of the present application also provides an assembly method for a battery cell, wherein the battery cell includes a shell and an end cover, wherein the end cover is arranged at one end of the shell, and the connection between the shell and the end cover has a first connection seam and a second connection seam arranged along the circumference of the shell, and the assembly method includes: loading the battery cell onto a first clamp or a second clamp on the same feed line; the first clamp is used to fix the shell and expose the first connection seam; the second clamp is used to fix the shell and expose the second connection seam; controlling the feed line to transport the first clamp and the second clamp to a welding assembly; controlling the welding assembly to weld the first connection seam of the battery cell fixed on the first clamp, or to weld the second connection seam of the battery cell fixed on the second clamp.

[0062] In the above manner, when the battery cell is placed in the first fixture, the welding assembly can weld the first connection seam, and when the battery cell is placed in the second fixture, the welding assembly can weld the second connection seam. Thus, the welding assembly can be used to weld both the first connection seam and the second connection seam, thereby reducing the manufacturing cost of the end cap welding device.

[0063] In some embodiments, after controlling the welding assembly to weld the first connecting seam of the battery cell fixed on the first clamp, or welding the second connecting seam of the battery cell fixed on the second clamp, the process includes: controlling the material feeding line to transport the first clamp and the second clamp to the steering assembly; controlling the steering assembly to remove the battery cell after welding the first connecting seam from the first clamp, turn it, and place it on the second clamp, or removing the battery cell after welding the second connecting seam from the second clamp, turn it, and place it on the first clamp; controlling the material feeding line to transport the second clamp and the first clamp from the steering assembly to the welding assembly.

[0064] In the above manner, the steering component can place the battery cells placed in the first fixture into the second fixture or place the battery cells placed in the second fixture into the first fixture. When the battery cells are placed in the first fixture, the first connection seam can be welded, and when placed in the second fixture, the second connection seam can be welded. Additionally, the welding of both the first connection seam and the second connection seam can be completed by the same welding component, thereby reducing the cost of the welding device.

[0065] In some embodiments, before controlling the feeding line to convey the first fixture and the second fixture to the steering component, it includes: controlling the discharging component to take out and discharge the battery cells with the first connection seam and the second connection seam welded from the corresponding first fixture or second fixture; controlling the feeding line to convey the battery cells with only the first connection seam welded on the corresponding first fixture to the steering component, and / or convey the battery cells with only the second connection seam welded on the corresponding second fixture to the steering component.

[0066] In the above manner, the welded battery cells can be discharged in a timely manner.

[0067] In some embodiments, controlling the welding component to weld the first connection seam of the battery cells fixed on the first fixture or the second connection seam of the battery cells fixed on the second fixture includes: controlling the first welding mechanism to pre-weld the first connection seam or the second connection seam of the battery cells; controlling the second welding mechanism to fully weld the pre-welded first connection seam or the second connection seam.

[0068] In the above manner, the welding quality can be improved.

[0069] In some embodiments, controlling the first welding mechanism to pre-weld the first connection seam or the second connection seam of the battery cells includes: controlling two relatively arranged pre-welding mechanisms to synchronously pre-weld the respective parts of the first connection seam or the second connection seam facing them from both sides of the battery cells; controlling two relatively arranged full-welding mechanisms to synchronously fully weld the respective parts of the first connection seam or the second connection seam facing them from both sides of the pre-welded battery cells.

[0070] In the above manner, the two first connection seams / the two second connection seams can be welded simultaneously, thereby improving the welding efficiency.

[0071] In some embodiments, after controlling the welding component to weld the first connection seam of the battery cells fixed on the first fixture or the second connection seam of the battery cells fixed on the second fixture, it includes: controlling the feeding line to convey the welded battery cells on the corresponding first fixture or second fixture to the rolling component; rolling the welded battery cells through the rolling component to roll the solder on the first connection seam or the second connection seam.

[0072] In the above manner, the weld seams of the first connection seam and the second connection seam can be shaped, improving the surface quality of the weld seams.

[0073] In some embodiments, after welding the battery cells, the roller pressing assembly is used to roll the solder on the first connection seam or the second connection seam, including: rolling the respective parts of the first connection seam and the second connection seam facing each side from both sides of the battery cell by two relatively arranged roller pressing mechanisms, and rolling the flanging of the end cover extending beyond the housing.

[0074] In the above manner, the weld seams of the first connection seam and the second connection seam and the housing can be shaped to improve the surface quality of the battery cell.

[0075] In some embodiments, after controlling the welding assembly to weld the first connection seam of the battery cell fixed on the first fixture or the second connection seam of the battery cell fixed on the second fixture, it includes: controlling the feeding line to convey the welded battery cell on the corresponding first fixture or second fixture to the welding slag cleaning assembly; controlling the welding slag cleaning assembly to clean the welding slag attached to the welded battery cell, so that the welding slag detaches from the battery cell.

[0076] In the above manner, the possibility of foreign matters such as welding slag remaining on the battery cell can be reduced.

[0077] In some embodiments, when controlling the feeding line to convey the first fixture and the second fixture to the welding assembly, it includes: controlling the press-fitting assembly to press-fit the battery cell loaded onto the first fixture or the second fixture to press-fit the housing and the end cover.

[0078] In the above manner, the press-fitting assembly can press-fit the end cover and the housing together, thereby reducing the possibility of misalignment during their assembly.

[0079] In some embodiments, after controlling the welding assembly to weld the first connection seam of the battery cell fixed on the first fixture or the second connection seam of the battery cell fixed on the second fixture, it includes: controlling the discharging assembly to take out and unload the welded battery cell from the first fixture or the second fixture.

[0080] In the above manner, automatic unloading can be achieved.

[0081] In some embodiments, controlling the discharging assembly to take out and unload the welded battery cell from the first fixture or the second fixture includes: controlling the moving mechanism to move the welded battery cell from the feeding line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cell outwards.

[0082] In the above - mentioned manner, blanking is carried out through a moving mechanism and a conveying mechanism independent of the material - feeding line, reducing the possibility of the material - feeding line stopping due to blanking, and thus being able to improve production efficiency.

[0083] In some embodiments, controlling the moving mechanism to move the battery monomers that have completed welding from the material - feeding line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery monomers outwards includes: controlling the moving mechanism to move the battery monomers that have completed welding and passed the inspection from the material - feeding line to the first conveying sub - mechanism; controlling the moving mechanism to move the battery monomers that have completed welding and failed the inspection from the material - feeding line to the second conveying sub - mechanism; controlling the first conveying sub - mechanism to convey the carried battery monomers outwards, and controlling the second conveying sub - mechanism to convey the carried battery monomers outwards.

[0084] In the above - mentioned manner, it is possible to carry out blanking for qualified and unqualified battery monomers respectively, which is conducive to the recycling of unqualified battery monomers and the post - treatment of qualified battery monomers.

[0085] In some embodiments, controlling the first conveying sub - mechanism to convey the carried battery monomers outwards includes: after a pair of battery monomers are stored in the first belt - pulling mechanism and / or the second belt - pulling mechanism and the pairing is successful, controlling the first belt - pulling mechanism and / or the second belt - pulling mechanism to move from the handling position to the output position to output the corresponding pair of battery monomers outwards.

[0086] In the above - mentioned manner, the first belt - pulling mechanism and the second belt - pulling mechanism work simultaneously, which is conducive to improving the efficiency of paired blanking.

[0087] In some embodiments, after a pair of battery monomers are stored in the first belt - pulling mechanism and / or the second belt - pulling mechanism, controlling the first belt - pulling mechanism and / or the second belt - pulling mechanism to move from the handling position to the output position to output the corresponding pair of battery monomers outwards includes: when a pair of battery monomers to be paired are moved by the moving mechanism to the first conveying belt and the second conveying belt, controlling the second conveying belt and the second conveying belt to move from the handling position to the output position simultaneously; when a battery monomer to be paired is moved by the moving mechanism to the second belt - pulling mechanism, buffering the other battery monomer to be paired through the first buffer belt or the second buffer belt; when there is a battery monomer buffered on the first buffer belt, pairing the battery monomer stored on the first conveying belt with the battery monomer buffered on the first buffer belt, and controlling the first conveying belt and the first buffer belt to move from the handling position to the output position; when there is a battery monomer buffered on the second buffer belt, pairing the battery monomer stored on the second conveying belt with the battery monomer buffered on the second buffer belt, and controlling the second conveying belt and the second buffer belt to move from the handling position to the output position.

[0088] In the above manner, the efficiency of pairing can be improved during the blanking process, and the risk of delaying the paired blanking due to the failure to store qualified battery cells in either the first conveying belt or the second conveying belt can be reduced.

[0089] An embodiment of the present application further provides a battery cell, which is obtained by assembling with the above end cap welding device or by the above assembly method; wherein, the battery cell includes a housing and an end cap, the end cap is arranged at one end of the housing, and the connection between the housing and the end cap has a first connection seam and a second connection seam arranged along the circumferential direction of the housing, and the housing and the end cap are welded and fixed through the first connection seam and the second connection seam.

[0090] In some embodiments, the housing includes two first side walls arranged oppositely and two second side walls arranged oppositely, and the two first side walls and the two second side walls are arranged alternately along the circumferential direction of the housing; the first connection seam is located between the two first side walls along the circumferential direction of the housing, and the second connection seam is located between the two second side walls along the circumferential direction of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0092] Figure 1 is an exploded schematic view of a battery cell according to one or more embodiments;

[0093] Figure 2 is a layout schematic view of an end cap welding device according to one or more embodiments;

[0094] Figure 3 is a schematic diagram of the principle of welding the first connection seam by a welding assembly according to one or more embodiments;

[0095] Figure 4 is a schematic diagram of the principle of welding the second connection seam by a welding assembly according to one or more embodiments;

[0096] Figure 5 is a structural schematic view of a steering assembly according to one or more embodiments;

[0097] Figure 6 is a structural schematic view of a first transfer mechanism or a second transfer mechanism according to one or more embodiments;

[0098] Figure 7 is a structural schematic view of a second welding mechanism according to one or more embodiments;

[0099] Figure 8 Schematic structural diagram of a rolling component according to one or more embodiments;

[0100] Figure 9 Schematic structural diagram of a welding slag cleaning component according to one or more embodiments;

[0101] Figure 10 Schematic structural diagram of a press-fitting component according to one or more embodiments;

[0102] Figure 11 is Figure 9 Partial enlarged schematic diagram of the press-fitting component in

[0103] Figure 12 Schematic structural diagram of a feeding component according to one or more embodiments;

[0104] Figure 13 Schematic structural diagram of a first conveying sub-mechanism according to one or more embodiments;

[0105] Figure 14 Schematic structural diagram of a first fixture according to one or more embodiments;

[0106] Figure 15 Schematic structural diagram of a second fixture according to one or more embodiments;

[0107] Figure 16 Schematic structural diagram of a positioning component according to one or more embodiments;

[0108] Figure 17 Schematic diagram of the working principle of a positioning component according to one or more embodiments;

[0109] Figure 18 Schematic flow diagram of an assembly method for a battery cell according to one or more embodiments.

[0110] The reference numerals in the specific embodiments are as follows:

[0111] 100 Battery cell;

[0112] 101 Housing; 1011 First side; 1012 Second side; 102 End cover; 103 Electrode assembly; 103a Open end; 1030 Pole ear; 104 Terminal; 1040 Through hole;

[0113] 30 End cover welding device;

[0114] 310 Feeding component;

[0115] 311 Feeding line; 3111 First conveying sub-line; 3112 Second conveying sub-line; 3113 First transfer mechanism; 3114 Second transfer mechanism; 3115 Translation motor; 3116 Transfer part;

[0116] 312 First fixture; 3121 First loading mechanism; 3122 First holding part; 3123 First side buckle; 3124 First base;

[0117] 313 Second fixture; 3131 Second loading mechanism; 3132 Second holding part; 3133 Second side buckle; 3134 Second base;

[0118] 320 Loading component; 321 Material storage mechanism; 322 Loading mechanism; 3221 Battery cell picking jaw; 3222 Transverse movement motor;

[0119] 330 Pressing component; 331 End cover pressing mechanism; 3310 End cover pressing block; 3311 First driving motor; 332 First side pressing mechanism; 3320 First side pressing block; 3321 Second driving motor; 333 Second side pressing mechanism; 3330 Second side pressing block; 3331 Third driving motor;

[0120] 340 Welding component; 341 First welding mechanism; 342 Second welding mechanism; 3421 Full welding mechanism; 3422 Dust removal mechanism;

[0121] 350 Rolling component; 351 Rolling mechanism; 3511 Bracket; 3512 Roller;

[0122] 360 Weld slag cleaning component; 361 Steel wire brush; 362 Driving motor; 363 Synchronous belt; 364 Transmission shaft;

[0123] 370 Post-welding inspection component;

[0124] 380 Discharging mechanism; 381 Transfer mechanism; 382 Conveying mechanism; 383 First conveying sub-mechanism; 384 Second conveying sub-mechanism; 3830 First pulling belt mechanism; 3831 First conveying pulling belt; 3832 First buffer pulling belt; 3835 Second pulling belt mechanism; 3836 Second conveying pulling belt; 3837 Second buffer pulling belt;

[0125] 390 Steering component; 391 Support frame; 392 Jaw mechanism; 393 Steering motor; 394 Lifting frame; 395 Lifting motor;

[0126] 400 Positioning component; 401 End cover positioning mechanism; 4010 End cover positioning block; 4011 Fourth driving motor; 402 First side positioning mechanism; 4020 First side positioning block; 4021 Fifth driving motor; 403 Second side positioning mechanism; 4030 Second side positioning block; 4031 Sixth driving motor. Detailed implementation manners

[0127] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0128] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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 specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0129] 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.

[0130] 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 appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0131] In the description of the embodiments of this application, the term "and / or" is only a relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0132] 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 pieces" refers to more than two pieces (including two pieces).

[0133] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "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. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0134] 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 integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it 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.

[0135] With the development of battery technology, battery cells are applied in more and more fields and gradually replace traditional fossil energy in the field of automotive power. A battery cell can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery cell, after discharging, the active substances can be activated by charging and continue to be used.

[0136] A battery cell generally includes a housing and an end cap, and the end cap is arranged at one end of the housing. When the housing and the end cap are assembled, a connection seam is often formed at the connection. To improve the firmness and sealing performance of the battery cell, generally during the production of the battery cell, the above connection seam is welded. However, due to the shape limitation of the battery housing, the connection seam often cannot be welded in one go. Therefore, multiple welding components are often required to weld different regions of the connection seam, which increases the manufacturing cost of the end cap welding device for the battery cell.

[0137] In order to reduce the manufacturing cost of the end - cover welding device, different regions of the connection seam can be welded using the same welding component. For example, the end - cover welding device can include a feeding component and a welding component: The feeding component includes a feeding line, a first fixture, and a second fixture. The first fixture and the second fixture are spaced apart on the same feeding line; The first fixture is configured to fix the housing and expose the first connection seam; The second fixture is configured to fix the housing and expose the second connection seam; The welding component is arranged along the feeding line and is used to weld the first connection seam when the first fixture fixing the battery cell is conveyed to the welding component, and is used to weld the second connection seam when the second fixture fixing the battery cell is conveyed to the welding component.

[0138] In the above - mentioned manner, when the battery cell is placed in the first fixture, the welding component can weld the first connection seam, and when the battery cell is placed in the second fixture, the welding component can weld the second connection seam. Thus, the welding component can be used to weld both the first connection seam and the second connection seam, thereby reducing the manufacturing cost of the end - cover welding device.

[0139] The battery cell disclosed in the embodiments of the present application can be used in electrical devices using the battery as a power source or various energy storage systems using the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery - powered vehicle, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc. The end - cover welding device disclosed in the embodiments of the present application can be used to weld the housing and the end - cover of the battery. The battery assembly system disclosed in the embodiments of the present application can be used to assemble the above - mentioned battery cell. The assembly method disclosed in the embodiments of the present application can be used to assemble the above - mentioned battery cell.

[0140] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used. Each battery cell can also be a primary battery.

[0141] The battery cell includes, but is not limited to, lithium - ion batteries, sodium - ion batteries, sodium - lithium - ion batteries, lithium - metal batteries, sodium - metal batteries, lithium - sulfur batteries, magnesium - ion batteries, nickel - metal hydride batteries, nickel - cadmium batteries, lead - acid batteries, etc. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0142] See Figure 1, according to one or more embodiments of the present application, the battery cell 100 may include a housing 101, an end cap 102, and an electrode assembly 103. The housing 101 has an open end 101a. A terminal post 104 is provided on the wall of the housing 101 opposite to the open end 101a. The terminal post 104 has a through hole 1040. The housing 101 and the end cap 102 are connected to form a receiving cavity communicating with the through hole 104. The active material coating portion of the electrode assembly 103 is disposed within the housing 101. The tab 1030 of the electrode assembly 103 passes through the through hole 1040 and is connected to the side of the terminal post 104 facing away from the receiving cavity.

[0143] The end cap may be disposed at one end of the housing 101, and a connection seam is provided at the connection between the housing 101 and the end cap 102 and is arranged circumferentially along the housing 101. As described above, the battery cell 100 may be quadrangular prism-shaped, cylindrical, hexagonal prism-shaped, or octagonal prism-shaped. Therefore, the shape of the connection seam is limited by the shape of the battery cell 100 (the housing 101 and the end cap 102). For example, the shape of the connection seam may also be quadrilateral, circular, hexagonal, or octagonal. For the convenience of description, the connection seam is hereinafter defined to include a first connection seam and a second connection seam, where the first connection seam and the second connection seam may respectively correspond to different regions of the connection seam. Of course, the connection seam may further include a third connection seam and a fourth connection seam.

[0144] Taking the battery cell 100 as a cuboid as an example, the housing 101 may include two first side surfaces 1011 and two second side surfaces 1012. The two first side surfaces 1011 are disposed opposite to each other, and the two second side surfaces 1012 are disposed opposite to each other. Each first side surface 1011 is used to connect the two second side surfaces 1012, and each second side surface 1012 may connect the two first side surfaces 1011. The first connection seam is located at the connection between the first side surface 1011 and the end cap 102, and the second connection seam is located at the connection between the second side surface 1012 and the end cap 102.

[0145] In some other embodiments, the battery cell 100 may be hexagonal prism-shaped. In this case, the housing 101 may include two first side surfaces 1011, two second side surfaces 1012, and two third side surfaces. The two first side surfaces 1011 are disposed opposite to each other, the two second side surfaces 1012 are disposed opposite to each other, and the two third side surfaces are disposed opposite to each other. Each second side surface 1012 may connect the first side surface 1011 and the third side surface. The first connection seam is located at the connection between the first side surface 1011 and the end cap 102, the second connection seam is located at the connection between the second side surface 1012 and the end cap 102, and the third connection seam is located at the connection between the third side surface and the end cap 102.

[0146] When the battery cell 100 is cylindrical, the housing 101 can be divided into two first side housing parts and two second side housing parts. The two first side housing parts are oppositely arranged, and the two second side housing parts are oppositely arranged. Each first side housing part can be located between the two second side housing parts. The first connection seam is located at the connection between the first side housing part and the end cap 102, and the second connection seam is located at the connection between the second side housing part and the end cap 102. Of course, the housing 101 can also be divided into two first side housing parts, two second side housing parts and two third side housing parts. The two first side housing parts are oppositely arranged, the two second side housing parts are oppositely arranged, and the two third side housing parts are oppositely arranged. Each second side housing part can connect the first side housing part and the third side housing part. The first connection seam is located at the connection between the first side housing part and the end cap 102, the second connection seam can be located at the connection between the second side housing part and the end cap 102, and the third connection seam is located at the connection between the third side housing part and the end cap 102.

[0147] See Figure 2 , Figure 3 and Figure 4 , according to one or more embodiments of the present application, optionally, the end cap welding device 30 of the battery cell 100 includes a feeding component 310 and a welding component 340: the feeding component 310 includes a feeding line 311, a first fixture 312 and a second fixture 313, and the first fixture 312 and the second fixture 313 are spaced apart on the same feeding line 311; the first fixture 312 is configured to fix the housing 101 and expose the first connection seam; the second fixture 313 is configured to fix the housing 101 and expose the second connection seam; the welding component 340 is arranged along the feeding line 311 and is used for welding the first connection seam when the first fixture 312 fixing the battery cell 100 is conveyed to the welding component 340, and for welding the second connection seam when the second fixture 313 fixing the battery cell 100 is conveyed to the welding component 340.

[0148] Wherein, exposing the first connection seam / second connection seam can mean not clamping or blocking the first connection seam / second connection seam so that the first connection seam / second connection seam can be welded. The feeding component 310 is used for transporting the battery cell 100, and the welding component 340 is used for welding the connection seams (such as the first connection seam and the second connection seam) of the battery cell 100. The feeding line 311 can drive the first fixture 312 and the second fixture 313 to move, and further drive the battery cell 100 arranged on the first fixture 312 or the second fixture 313 to move. The welding component 340 can weld the first connection seam and the second connection seam by laser welding or ultrasonic welding.

[0149] In the above manner, when the battery cell 100 is placed in the first fixture 312, the welding assembly 340 can weld the first joint, and when the battery cell 100 is placed in the second fixture 313, the welding assembly 340 can weld the second joint. Thus, the welding assembly 340 can be used to weld both the first joint and the second joint, thereby reducing the manufacturing cost of the end cap welding device 30.

[0150] See Figure 5 , according to one or more embodiments of the present application, the end cap welding device 30 includes a steering assembly 390, and the steering assembly 390 is disposed at an interval from the welding assembly 340 along the material conveying line 311; the material conveying line 311 is used to convey the first fixture 312 and the second fixture 313 from the welding assembly 340 to the steering assembly 390, and after passing through the steering assembly 390, convey them back to the welding assembly 340; the steering assembly 390 is used to take out the battery cell 100 after welding the first joint from the corresponding first fixture 312, turn it, and place it on the second fixture 313 after turning; or, the steering assembly 390 is used to take out the battery cell 100 after welding the second joint from the corresponding second fixture 313, turn it, and place it on the first fixture 312 after turning.

[0151] That is to say, the material conveying line 311 can drive the first fixture 312 and the second fixture 313 to move in a cycle. The steering assembly 390 is used to turn the battery cell 100 that has welded the first joint or the second joint when the material conveying line 311 moves in a cycle, so that the battery cell 100 can further weld the second joint or the first joint that has not been welded during the cycle.

[0152] In the above manner, the steering assembly 390 can place the battery cell 100 placed in the first fixture 312 on the second fixture 313 or place the battery cell 100 placed in the second fixture 313 on the first fixture 312. When the battery cell 100 is placed in the first fixture 312, the first joint can be welded, and when it is placed in the second fixture 313, the second joint can be welded. In addition, the welding of both the first joint and the second joint can be completed by the same welding assembly 340, thereby reducing the cost of the welding device.

[0153] According to one or more embodiments of the present application, the steering assembly 390 includes a support frame 391, a jaw mechanism 392, and a steering motor 393; the support frame 391 is disposed outside the material conveying line 311, the jaw mechanism 392 is located above the material conveying line 311, and is rotatably supported by the support frame 391; the steering motor 393 is drivingly connected to the jaw mechanism 392 for driving the jaw mechanism 392 to rotate relative to the support frame 391 for steering; the jaw mechanism 392 is used for clamping the battery cell 100 and steering the battery cell 100.

[0154] The jaw mechanism 392 can clamp the battery cell 100, and the steering motor 393 drives the jaw mechanism 392 to rotate, thereby steering the battery cell 100. In the above manner, the steering motor 393 can drive the jaw mechanism 392 clamping the battery cell 100 to rotate, thereby realizing the steering of the battery cell 100.

[0155] According to one or more embodiments of the present application, the steering assembly 390 includes a lifting frame 394 and a lifting motor 395, the lifting frame 394 is liftably supported by the support frame 391, and the jaw mechanism is rotatably disposed on the lifting frame 394; the lifting motor 395 is disposed on the support frame 391 or the lifting frame 394 and is drivingly connected to the lifting frame 394 for driving the lifting frame 394 to lift relative to the support frame 391.

[0156] During the movement of the battery cell 100 along with the material conveying assembly 310, the lifting motor 395 drives the lifting frame 394 to descend, thereby driving the jaw mechanism 392 to descend to pick up the battery cell 100. Subsequently, the lifting frame 394 rises, so that the jaw mechanism 392 clamps the battery cell 100 and disengages from the first fixture 312 or the second fixture 313. After the battery cell 100 disengages from the first fixture 312 or the second fixture 313, the steering motor 393 drives the jaw mechanism 392 to rotate so that the battery cell 100 is steered. After the steering of the battery cell 100 is completed, the lifting motor 395 drives the lifting frame 394 to descend and drives the jaw mechanism 392 to descend. At the same time, the material conveying line drives the second fixture 313 or the first fixture 312 not placed thereon to move synchronously to the lower side of the jaw mechanism 392 to receive the battery cell 100 put down by the jaw mechanism 392.

[0157] In the above manner, the steering assembly 390 can take out the battery cell 100 from the first fixture 312 or the second fixture 313 and then steer it, reducing the possibility of interference between the battery cell 100 and other devices during the steering process.

[0158] See Figure 2 and Figure 6, according to one or more embodiments of the present application, the material feeding line 311 includes a first conveying sub-line 3111, a second conveying sub-line 3112, a first transfer mechanism 3113 and a second transfer mechanism 3114; the first conveying sub-line 3111 and the second conveying sub-line 3112 are arranged side by side, and the transmission directions of the first conveying sub-line 3111 and the second conveying sub-line 3112 are opposite; the first transfer mechanism is arranged at one end of the first conveying sub-line 3111 and the second conveying sub-line 3112 for transferring the first fixture 312 and the second fixture 313 from the first conveying sub-line 3111 to the first conveying sub-line 3111; the second transfer mechanism 3114 is arranged at the other end of the first conveying sub-line 3111 and the second conveying sub-line 3112 for transferring the first fixture 312 and the second fixture 313 from the second conveying sub-line 3112 to the first conveying sub-line 3111; the welding assembly 340 is arranged along the first conveying sub-line 3111, and the turning assembly 390 is arranged along the second conveying sub-line 3112.

[0159] See Figure 6 , the first transfer mechanism 3113 / the third transfer mechanism may include a linear motor and a transfer member 3116 movable under the drive of the linear motor. The first fixture 312 and the second fixture 313 may be carried on the transfer member 3116.

[0160] The first conveying sub-line 3111 can convey the first fixture 312 and the second fixture 313 to the first transfer mechanism 3113, the first transfer mechanism 3113 conveys the first fixture 312 and the second fixture 313 to the second conveying sub-line 3112, the second conveying sub-line 3112 conveys the first fixture 312 to the second transfer mechanism 3114, and the second transfer mechanism 3114 can convey the first fixture 312 and the second fixture 313 to the first conveying sub-line 3111. Thus, the battery cell 100 can be moved cyclically along with the conveying assembly.

[0161] In the above manner, the first fixture 312 and the second fixture 313 can move cyclically along with the material feeding line 311, so that the end cap welding device 30 can continuously perform the assembly and welding of the battery cell 100 in a cycle. In addition, the welding assembly 340 and the turning assembly 390 are arranged in different areas, which is beneficial for the user to observe and repair the welding device.

[0162] See Figure 2 and Figure 7 , according to one or more embodiments of the present application, the welding assembly 340 includes a first welding mechanism 341 and a second welding mechanism 342, and the first welding mechanism 341 and the second welding mechanism 342 are arranged at intervals along the material feeding line 311; the first welding mechanism 341 is used for pre-welding the first joint or the second joint, and the second welding mechanism 342 is used for further welding the first joint or the second joint after pre-welding.

[0163] The first welding mechanism 341 and the second welding mechanism 342 may include lasers. The lasers can achieve pre-welding or further welding in a way controlled by a galvanometer scanner, or can also achieve pre-welding or further welding in a way that the lasers are configured as movable as a whole.

[0164] Pre-welding may refer to welding the first joint or the second joint by spot welding. By the above method, the welding quality can be improved.

[0165] Generally, for the first joint or the second joint whose length exceeds a preset length, pre-welding can be carried out, and for the joint whose length does not exceed the preset length, pre-welding may not be carried out. For example, in some embodiments, the length of the first joint exceeds the preset length, and the length of the second joint does not exceed the preset length. In this case, only the first joint can be pre-welded.

[0166] According to one or more embodiments of the present application, the first welding mechanism 341 includes two pre-welding mechanisms, and the two pre-welding mechanisms are oppositely arranged on both sides of the material conveying line 311; the second welding mechanism 342 includes two full-welding mechanisms 3421, and the two full-welding mechanisms 3421 are oppositely arranged on both sides of the material conveying line 311; the two pre-welding mechanisms are used for pre-welding the respective parts of the first joint or the second joint they face, and the two full-welding mechanisms 3421 are used for full-welding the respective parts of the first joint or the second joint they face.

[0167] The two pre-welding mechanisms can simultaneously pre-weld two first joints or two second joints by spot welding. The two full-welding mechanisms 3421 can simultaneously full-weld two first joints or two second joints by continuous welding.

[0168] By the above method, two first joints / two second joints can be welded simultaneously, and thus the welding efficiency can be improved.

[0169] In addition, the second welding mechanism 342 may include a full-welding mechanism 3421 and a dust removal mechanism 3422. The dust removal mechanism 3422 may be fixed relative to the full-welding mechanism 3421 and is used for initially cleaning the smoke and dust generated during welding through air flow or negative pressure when the full-welding mechanism 3421 is welding.

[0170] According to one or more embodiments of the present application, the second welding mechanism 342 is used for performing the first welding on the first joint or the second joint after pre-welding from a first direction, and performing the second welding on the first joint or the second joint after the first welding from a second direction, and the first direction and the second direction are opposite.

[0171] The second welding mechanism 342 can weld the first connection seam or the second connection seam twice. By the above method, the welding quality can be improved and the problem of insufficient solder pool of the bonding wire can be solved.

[0172] According to one or more embodiments of the present application, the welding assembly 340 includes at least one full-welding mechanism 3421 for full-welding the first connection seam or the second connection seam.

[0173] By the above method, the use of the pre-welding mechanism can be reduced, thereby reducing the manufacturing cost.

[0174] See Figure 8 , according to one or more embodiments of the present application, the end cap welding device 30 includes a rolling assembly 350 spaced from the welding assembly 340 for rolling the battery cell 100 welded by the welding assembly 340 to roll the solder on the first connection seam or the second connection seam.

[0175] By the above method, the weld seams of the first connection seam and the second connection seam can be shaped to improve the surface quality of the weld seams.

[0176] According to one or more embodiments of the present application, the rolling assembly 350 includes two rolling mechanisms 351 oppositely arranged on both sides of the feeding line 311; the two rolling mechanisms 351 are used to press the battery cell 100 from both sides of the feeding line 311 to roll the first connection seam or the second connection seam and the flanging of the end cap 102 extending beyond the housing 101.

[0177] By the above method, the weld seams of the first connection seam and the second connection seam and the end cap 102 can be shaped to improve the surface quality of the battery cell 100.

[0178] According to one or more embodiments of the present application, each rolling mechanism 351 includes a bracket 3511 and two rollers 3512. The bracket 3511 is arranged outside the feeding line 311, and the two rollers 3512 are spaced along the extension direction of the feeding line 311 on the bracket 3511 so that the battery cell 100 can pass through the two rollers 3512 in sequence; the two rollers 3512 are rotatably arranged on the bracket 3511 to roll the battery cell 100.

[0179] By the above method, the two rollers 3512 can perform secondary rolling and shaping on the weld seams of the first connection seam and the second connection seam to further improve the surface quality of the weld seams.

[0180] See Figure 9, according to one or more embodiments of the present application, the end - cap welding device 30 includes a slag cleaning assembly 360. The slag cleaning assembly 360 is arranged at an interval along the material conveying line 311 from the welding assembly 340, and is used to clean the slag on the battery cell 100 after being welded by the welding assembly 340, so that the slag is separated from the battery cell 100.

[0181] The slag cleaning assembly 360 may include a wire brush 361. The wire brush 361 may be column - shaped and rotatable. In addition, the slag cleaning assembly 360 may also clean the slag on the battery cell 100 through air flow.

[0182] In the above - mentioned manner, the possibility of foreign matters such as slag remaining on the battery cell 100 can be reduced.

[0183] In addition, the slag cleaning assembly 360 may further include a driving motor 362, a synchronous belt 363 and a transmission shaft 364. The wire brush 361 may be fixed to the transmission shaft 364. The driving motor 362 may drive the transmission shaft 364 to rotate through the synchronous belt 363, and then drive the wire brush 361 to rotate. In the above - mentioned manner, the probability of slag residue can be further reduced.

[0184] See Figure 10 and Figure 11 , according to one or more embodiments of the present application, the end - cap welding device 30 includes a press - fitting assembly 330. The press - fitting assembly 330 is arranged at an interval along the material conveying line 311 from the welding assembly 340. The press - fitting assembly 330 is used to press - fit the housing 101 and the end - cap 102 before the battery cell 100 is conveyed to the welding assembly 340; the welding assembly 340 is used to weld the battery cell 100 after being press - fitted.

[0185] In the above - mentioned manner, the press - fitting assembly 330 can press - fit the end - cap 102 and the housing 101 together, and then reduce the possibility of misalignment during their assembly.

[0186] The press-fitting assembly 330 may include an end-cap press-fitting mechanism 331, a first side press-fitting mechanism 332, and a second side press-fitting mechanism 333. The end-cap press-fitting mechanism 331 may include a first driving motor 3311 and an end-cap press-fitting block 3310 that is drivingly connected to the first driving motor 3311. The end-cap press-fitting block 3310 may perform press-fitting and positioning on the battery cell 100 from the side where the end-cap 102 of the battery cell 100 is located. The first side press-fitting mechanism 332 may include a second driving motor 3321 and a first side press-fitting block 3320 that is drivingly connected to the second driving motor 3321. The first side press-fitting block 3320 may perform press-fitting and positioning on the first side 1011 of the housing 101. The second side press-fitting mechanism 333 may include a third driving motor 3331 and a second side press-fitting block 3330 that is drivingly connected to the third driving motor 3331. The second side press-fitting block 3330 may perform press-fitting and positioning on the second side 1012 of the housing 101. Thus, the battery cell 100 can be positioned during the press-fitting process, which is conducive to the laser accurately welding the first connection seam or the second connection seam.

[0187] The number of the first side press-fitting mechanisms 332 may be two, and the two first side press-fitting mechanisms 332 may be arranged on opposite sides for press-fitting the two first sides 1011. The number of the second side press-fitting mechanisms 333 may be two, and the two second side press-fitting mechanisms 333 may be arranged at opposite ends for press-fitting the two second sides 1012.

[0188] See Figure 12 According to one or more embodiments of the present application, the end-cap welding device 30 includes a loading assembly 320. The loading assembly 320 is arranged at an interval from the feeding line 311. The loading assembly 320 is used to place the battery cell 100 to be loaded and welded onto the first fixture 312 or the second fixture 313.

[0189] In the above manner, the end-cap welding device 30 can achieve automatic loading.

[0190] According to one or more embodiments of the present application, the loading assembly 320 includes a storage mechanism 321 and a loading mechanism 322. The storage mechanism 321 is used to store the battery cells 100 to be loaded and welded; the loading mechanism 322 is arranged along the feeding line 311. The loading mechanism 322 is used to take out the corresponding battery cells 100 from the storage mechanism 321 and place the battery cells 100 onto the first fixture 312 or the second fixture 313.

[0191] In the above manner, the end-cap welding device 30 can be used for assembling a batch of battery cells 100.

[0192] According to one or more embodiments of the present application, the storage mechanism 321 is configured to store the battery cells 100 in a predetermined placement posture relative to the feeding line 311. The loading mechanism 322 is configured to take out the battery cells 100 in the predetermined placement posture from the storage mechanism 321 and convey the battery cells 100 to the first fixture 312 while maintaining the predetermined placement posture, and the predetermined placement posture is consistent with the fixed posture required by the first fixture 312.

[0193] The loading mechanism 322 may include a cell picking jaw 3221 and a transverse movement motor 3222. The cell picking jaw 3221 may be configured to pick up the battery cells 100 of the storage mechanism 321. The transverse movement motor 3222 may drive the cell picking jaw 3221 to reciprocate between the storage mechanism 321 and the feeding line 311 so as to reciprocally convey the battery cells 100 of the storage mechanism 321 to the first fixture 312.

[0194] In the above manner, the feeding efficiency of the feeding assembly 320 can be improved.

[0195] See Figure 2 and Figure 13 According to one or more embodiments of the present application, the end cap welding device 30 includes a discharging assembly. The discharging assembly is disposed at an interval from the feeding line 311, and the discharging assembly is configured to take out the battery cells 100 that have completed welding from the feeding line 311 and convey them outward.

[0196] In the above manner, the end cap welding device 30 can automatically unload materials.

[0197] According to one or more embodiments of the present application, the discharging assembly includes a moving mechanism 381 and a conveying mechanism 382. The moving mechanism 381 is disposed along the feeding line 311 and is configured to move the battery cells 100 that have completed welding from the feeding line 311 to the conveying mechanism 382. The conveying mechanism 382 is configured to convey the corresponding battery cells 100 outward.

[0198] In the above manner, the end cap welding device 30 can unload materials through the moving mechanism 381 and the conveying mechanism 382 independent of the feeding line 311, reducing the possibility of the feeding line 311 stopping due to unloading materials.

[0199] According to one or more embodiments of the present application, the conveying mechanism 382 includes a first conveying sub-mechanism 383 and a second conveying sub-mechanism 384. The moving mechanism 381 is configured to move the battery cells 100 that have completed welding and passed the inspection from the feeding line 311 to the first conveying sub-mechanism 383, and move the battery cells 100 that have completed welding and failed the inspection from the feeding line 311 to the second conveying sub-mechanism 384. The first conveying sub-mechanism 383 and the second conveying sub-mechanism 384 are configured to convey the battery cells 100 carried by them outward respectively.

[0200] The first conveying sub-mechanism 383 can also be called the blanking belt. The second conveying sub-mechanism 384 can also be called the NG belt.

[0201] In the above manner, the qualified and unqualified battery cells 100 can be blanked respectively, which is conducive to the recycling of the unqualified battery cells 100 and the post-treatment of the qualified battery cells 100.

[0202] According to one or more embodiments of the present application, the first conveying sub-mechanism 383 includes a first belt mechanism 3830 and a second belt mechanism 3835. The first belt mechanism 3830 and the second belt mechanism 3835 can move relative to the transfer mechanism 381 and can move between the transfer position and the output position. The first belt mechanism 3830 and the second belt mechanism 3835 are used to move to or away from the output position; when at the output position, the first belt mechanism 3830 and the second belt mechanism 3835 store the battery cells 100 transferred by the transfer mechanism 381; the first belt mechanism 3830 and / or the second belt mechanism 3835 are used to store the battery cells 100 and move to the output position to output the corresponding pair of battery cells 100 after a pair of battery cells 100 are successfully paired.

[0203] In the above manner, the first belt mechanism 3830 and the second belt mechanism 3835 work simultaneously, which is beneficial to improving the efficiency of paired blanking.

[0204] According to one or more embodiments of the present application, the first belt pulling mechanism 3830 includes a first conveying belt 3831 and a first buffer belt 3832; the second belt pulling mechanism 3835 includes a second conveying belt 3836 and a second buffer belt 3837; the first conveying belt 3831 and the first buffer belt 3832 are arranged side by side, and the second conveying belt 3836 and the second buffer belt 3837 are arranged side by side; the first conveying belt 3831 and the second conveying belt 3836 are arranged side by side with a gap therebetween and are located on both sides of the output position; the first conveying belt 3831 and the first buffer belt 3832 can move together towards the output position or away from the output position; the second conveying belt 3836 and the second buffer belt 3837 can move together towards the output position or away from the output position; the first buffer belt 3832 and the second buffer belt 3837 are respectively used for buffering another battery cell 100 to be paired when a battery cell 100 to be paired is moved to the second belt pulling mechanism 3835; the first conveying belt 3831 and the second conveying belt 3836 are respectively used for storing the battery cells 100 to be paired; when the first buffer belt 3832 buffers a battery cell 100, the battery cell 100 stored on the first conveying belt 3831 is paired with the battery cell 100 buffered on the first buffer belt 3832; when the second buffer belt 3837 buffers a battery cell 100, the battery cell 100 stored on the second conveying belt 3836 is paired with the battery cell 100 buffered on the second buffer belt 3837, and when the first buffer belt 3832 does not buffer a battery cell 100 and the second buffer belt 3837 does not buffer a battery cell 100, the battery cell 100 stored on the first conveying belt 3831 is paired with the battery cell 100 stored on the second conveying belt 3836.

[0205] When a battery cell 100 is stored on the first conveying belt 3831 and no battery cell 100 is stored on the second conveying belt 3836 (for example, the battery cell 100 originally to be placed on the second conveying belt 3836 is a non-conforming product and is transferred to the second conveying sub-mechanism 384), at this time, the battery cell 100 on the first conveying belt 3831 cannot be paired, and the battery cell 100 on the first conveying belt 3831 can be transferred to the first buffer belt 3832. Similarly, when the battery cell 100 on the second conveying belt 3836 is not paired, it can also be transferred to the second buffer belt 3837.

[0206] When the first buffer belt 3832 buffers a battery cell 100, the battery cell 100 stored on the first conveying belt 3831 and the battery cell 100 buffered on the first buffer belt 3832 are paired, and then the first conveying belt 3831 and the first buffer belt 3832 move together towards the output position to discharge the paired battery cells 100.

[0207] When the second buffer belt 3837 buffers a battery cell 100, the battery cell 100 stored on the second conveying belt 3836 and the battery cell 100 buffered on the second buffer belt 3837 are paired. Subsequently, the first conveying belt 3831 and the first buffer belt 3832 move together towards the output position to discharge the paired battery cells 100.

[0208] When neither the first buffer belt 3832 nor the second buffer belt 3837 buffers a battery cell 100, and when the first conveying belt 3831 and the second conveying belt 3836 both store battery cells 100, the battery cells 100 on the first conveying belt 3831 and the second conveying belt 3836 can be paired and discharged after pairing.

[0209] Through the above method, the pairing efficiency can be improved during the discharging process, and the risk of delaying the paired discharging due to either the first conveying belt 3831 or the second conveying belt 3836 not storing qualified battery cells 100 can be reduced.

[0210] According to one or more embodiments of the present application, the end - cover welding device 30 includes a post - welding detection assembly 370. The post - welding detection assembly 370 is arranged along the material conveying line 311 between the welding assembly 340 and the transfer mechanism 381. The post - welding detection assembly 370 is used to detect whether the welded battery cell 100 is qualified.

[0211] The post - welding detection assembly 370 can perform imaging recognition on the battery cell 100 through a 2D camera or a 3D camera. Through the above method, the post - welding detection assembly 370 can efficiently identify qualified and unqualified battery cells 100.

[0212] See Figure 14 and Figure 15 According to one or more embodiments of the present application, the first fixture 312 includes a first bearing mechanism 3121 and a first holding member 3122. The first bearing mechanism 3121 is used to bear the battery cell 100. The first holding member 3122 is arranged on the first bearing mechanism 3121 and is used to position the battery cell 100 borne on the first bearing mechanism 3121. The second fixture 313 includes a second bearing mechanism 3131 and a second holding member 3132. The second bearing mechanism 3131 is used to bear the battery cell 100. The second holding member 3132 is arranged on the second bearing mechanism 3131 and is used to position the battery cell 100 borne on the second bearing mechanism 3131.

[0213] Through the above method, by positioning the battery cell 100, the possibility of the battery cell 100 shaking during the assembly and processing is reduced.

[0214] Considering that the battery cell 100 needs to be turned by the turning assembly 390 during the process of moving along the feeding line 311. Therefore, the first holding member 3122 can have a holding state and a releasing state. When the battery cell 100 needs to be welded, inspected, or welded, the first holding member 3122 can be in the holding state to position the battery cell 100. When the battery cell 100 moves to the turning assembly 390, the first holding member 3122 can be in the releasing state, so that the turning assembly 390 can turn the battery cell 100. Before the battery cell 100 is pressed by the pressing assembly 330, the first holding member 3122 / the second holding member 3132 can be in the releasing state. After the pressing is completed, the first holding member 3122 / the second holding member 3132 can be in the holding state until the battery cell 100 moves to the turning assembly 390 and then switches to the releasing state.

[0215] According to one or more embodiments of the present application, the first fixture 312 further includes two first side fasteners 3123, which are oppositely arranged and are used to pre-limit the battery cell 100 carried on the first carrying mechanism 3121 and disposed between the two first side fasteners 3123. The second fixture 313 further includes two second side fasteners 3133, which are oppositely arranged and are used to pre-limit the battery cell 100 carried on the second carrying mechanism 3131 and disposed between the two first side fasteners 3123. The spacing distances between the two first side fasteners 3123 and the two second side fasteners 3133 are different.

[0216] Pre-limiting the battery cell 100 can mean maintaining the battery cell 100 generally in a preset state, for example, generally maintaining an upright state. The first side fastener 3123 / the second side fastener 3133 can be in a semi-enclosed structure to contact the battery cell 100 when the battery cell 100 is placed between the two first side fasteners 3123 / the second side fasteners 3133 to provide lateral support, or there is a gap between the battery cell 100 and the housing 101 of the battery cell 100 when the battery cell 100 is placed between the two second side fasteners 3133 to provide lateral support when the battery is tilted.

[0217] In the above manner, the first side fastener 3123 and the second side fastener 3133 can enable the battery cell 100 to be disposed on the first carrying mechanism 3121 and the second carrying mechanism 3131 in a substantially upright manner, reducing the possibility of the battery cell 100 tipping over.

[0218] According to one or more embodiments of the present application, the first fixture 312 further includes a first base 3124, and the first carrying mechanism 3121 is slidably disposed on the first base 3124. The sliding direction of the first carrying mechanism 3121 is perpendicular to the conveying direction of the feeding line 311; the second fixture 313 further includes a second base 3134, and the second carrying mechanism 3131 is slidably disposed on the second base 3134. The sliding direction of the second carrying mechanism 3131 is perpendicular to the conveying direction of the feeding line 311.

[0219] Specifically, when the first fixture 312 or the second fixture 313 moves to the welding area of the welding assembly 340, the first carrying mechanism 3121 can be pushed to move relative to the first base 3124, or the second carrying mechanism 3131 can be pushed to move relative to the second base 3134 by an external mechanism, so that the first connection seam or the second connection seam can be accurately located in the processing area of the welding assembly 340. When the first fixture 312 or the second fixture 313 moves to the rolling assembly 350, if the first fixture 312 or the second fixture 313 is fixed to the feeding line 311, it may cause the rolling assembly 350 to be unable to roll the two weld seams evenly, reducing the efficiency of rolling and shaping. When the first fixture 312 or the second fixture 313 moves to the slag cleaning assembly 360, if the positions of the first fixture 312 or the second fixture 313 are inappropriate, it may also cause the slag cleaning effect of the slag cleaning assembly 360 to be reduced. Therefore, the first carrying mechanism 3121 or the second carrying mechanism 3131 can be pushed to move by an external mechanism, so that the slag cleaning assembly 360 can clean the slag of the first connection seam or the second connection seam.

[0220] By the above method, the first carrying mechanism 3121 and the second carrying mechanism 3131 can be moved along the direction perpendicular to the conveying direction of the feeding line 311, so that the battery cell 100 can be moved to a suitable area to be processed at any step of the assembly and processing.

[0221] Considering that during the process of the steering assembly 390 turning the battery cell 100 of the first fixture 312 and placing it on the second fixture 313, or turning the battery cell 100 of the second fixture 313 and placing it on the first fixture 312, the accuracy of the steering assembly 390 may not be sufficient, resulting in a certain degree of randomness in the placement position of the battery cell 100, which may affect subsequent processing.

[0222] Therefore, referring to Figure 16 and Figure 17The end cap welding device 30 may include a positioning assembly 400 for positioning the battery cell 100 after turning. The positioning assembly 400 may include an end cap positioning mechanism 401, a first side positioning mechanism 402, and a second side positioning mechanism 403. The end cap positioning mechanism 401 may include a fourth drive motor 4011 and an end cap positioning block 4010 that is transmission-connected to the fourth drive motor 4011. The end cap positioning block 4010 may position and limit the battery cell 100 from the side where the end cap 102 of the battery cell 100 is located. The first side positioning mechanism 402 may include a fifth drive motor 4021 and a first side positioning block 4020 that is transmission-connected to the fifth drive motor 4021. The first side positioning block 4020 may position and limit the first side 1011 of the housing 101. The second side positioning mechanism 403 may include a sixth drive motor 4031 and a second side positioning block 4030 that is transmission-connected to the sixth drive motor 4031. The second side positioning block 4030 may position and limit the second side 1012 of the housing 101. Thus, the battery cell 100 can be positioned during the positioning process, which is conducive to the laser being able to accurately weld the first connection seam or the second connection seam. In addition, the number of the first side positioning mechanisms 402 can be two, and the two first side positioning mechanisms 402 can be arranged at opposite sides to position the two first side surfaces 1011. The number of the second side positioning mechanisms 403 can be two, and the two second side positioning mechanisms 403 can be arranged at opposite ends to position the two second side surfaces 1012.

[0223] After the battery cell is turned by the steering assembly and before the turned battery cell is positioned by the positioning assembly, the second retainer / first retainer may be in a released state; when the turned battery cell is positioned by the positioning assembly, the second retainer / first retainer may be in a retaining state.

[0224] According to one or more embodiments of the present application, the shell 101 includes two first side walls arranged opposite to each other and two second side walls arranged opposite to each other, and the two first side walls and the two second side walls are arranged alternately along the circumference of the shell 101; the first connecting seam is located between the two first side walls along the circumference of the shell 101, and the second connecting seam is located between the two second side walls along the circumference of the shell 101.

[0225] In the above manner, the end cover welding device can be used to assemble quadrangular prism-shaped battery cells.

[0226] According to one or more embodiments of the present application, a battery assembly system includes a conveying device and an assembly device, wherein the conveying device is used to convey the structure to be assembled to each workstation of the assembly device; the workstations of the assembly equipment include at least a pole ear welding device, a shell insertion device, a pole ear piercing device, a pole column welding device and an end cover welding device; wherein the pole ear welding device is used to weld multiple pole ear sheets of an electrode assembly to form a pole ear portion; the shell insertion device is used to load the electrode assembly into a shell from an open end; the pole ear piercing device is used to clamp the pole ear portion through the through hole when the electrode assembly is loaded into the shell; and the pole column welding device is used to weld the pole ear portion passing through the through hole to the side of the pole facing away from the accommodating cavity.

[0227] It should be noted that, in the present embodiment, the conveying equipment includes a conveyor line, which can be a conveying structure formed by a conveyor roller driven by a motor and a conveyor belt, or a conveying structure formed by a motor-driven conveyor chain link, or an AGV conveyor cart, which can realize conveying in at least one direction and can support and ensure the stability of the structure to be assembled.

[0228] The purpose of the pole ear welding device is to form the pole ear portion after pre-welding the pole ear sheet. It can be an ultrasonic welding device, which can ensure that the pole ear is welded in a clamped and stable state. The shell entry device is a pushing mechanism or a clamping mechanism, which can stably move the electrode assembly toward the open end of the shell and enter the accommodating cavity through the open end. Similarly, the pole ear piercing device can adopt a clamping structure or a guiding structure, which can guide the pole ear portion to pass through the through hole smoothly without interfering with the shell. The pole column welding device aims to realize the welding of the pole ear portion and the pole, and can be a laser welding device. The end cover welding device aims to realize the circumferential edge welding of the end cover and the open end of the shell, and is also a laser welding device.

[0229] In addition, the assembly equipment is not limited to including a pole ear welding device, a shell insertion device, a pole ear piercing device, a pole column welding device and an end cap welding device. Exemplarily, when the number of electrode assemblies is multiple, for example, two, the assembly equipment also includes a pairing device, which is used to stack a plurality of electrode assemblies so that the pole ear sheets of the two electrode assemblies are roughly opposite, so that the conveying structure can convey the matched electrode assemblies to the pole ear welding device for welding the pole ear sheets to facilitate the formation of the pole ear portion. Another exemplary embodiment, in order to ensure the reliability of the battery assembly process, dust removal, NG detection stations, etc. can also be added between any two adjacent stations, which is not limited in this embodiment. It should be noted that in this embodiment, the conveying equipment includes a conveying line, which can be a conveying structure formed by a conveying roller driven by a motor and a conveying belt, or a conveying structure formed by a conveying chain link driven by a motor, or an AGV conveying trolley, which can realize conveying in at least one direction and can support and ensure the stability of the structure to be assembled.

[0230] The purpose of the tab welding device is to form a tab part after pre-welding the tab piece, and it can be an ultrasonic welding device, which can ensure that the tab is welded in a stable clamped state. The shell inserting device is a pushing mechanism or a clamping mechanism, which can stably move the electrode assembly towards the open end of the shell and enter the accommodating cavity through the open end. Similarly, the tab threading device can adopt a clamping structure or a guiding structure, which can guide the tab part to smoothly pass through the through hole without interfering with the shell. The purpose of the terminal welding device is to realize the welding of the tab part and the terminal, and it can be a laser welding device. The purpose of the end cap welding device is to realize the circumferential edge welding of the end cap and the open end of the shell, and it is also a laser welding device.

[0231] In addition, the assembly equipment is not limited to including a tab welding device, a shell inserting device, a tab threading device, a terminal welding device and an end cap welding device. Exemplarily, when the number of electrode assemblies is multiple, for example, two, the assembly equipment further includes a pairing device, which is used to stack multiple electrode assemblies so that the tab pieces of the two electrode assemblies are substantially opposite to each other, so that the conveying structure can convey the paired electrode assemblies to the tab welding device for welding the tab pieces to facilitate the formation of the tab part. Another example is that in order to ensure the reliability of the battery assembly process, a dust removal and NG detection station can also be added between any two adjacent workstations, which is not limited in this embodiment.

[0232] See Figure 18 , according to one or more embodiments of the present application, the assembly method of the battery cell includes: Step S100: Loading the battery cell onto the first fixture or the second fixture on the same conveying line; the first fixture is used to fix the shell and expose the first joint; the second fixture is used to fix the shell and expose the second joint; Step S200: Controlling the conveying line to convey the first fixture and the second fixture to the welding assembly; Step S250: Controlling the welding assembly to weld the first joint of the battery cell fixed on the first fixture, or to weld the second joint of the battery cell fixed on the second fixture.

[0233] In the above manner, when the battery cell is placed on the first fixture, the welding assembly can weld the first joint, and when the battery cell is placed on the second fixture, the welding assembly can weld the second joint. Thus, the welding assembly can be used to weld both the first joint and the second joint, thereby reducing the manufacturing cost of the end cap welding device.

[0234] According to one or more embodiments of the present application, Step S200 includes: Controlling the pressing assembly to press the battery cell loaded onto the first fixture or the second fixture to press-fit the shell and the end cap.

[0235] In the above manner, the press-fitting assembly can press-fit the end cap 102 and the housing 101 together, thereby reducing the possibility of misalignment during the assembly of the two.

[0236] According to one or more embodiments of the present application, step S250 includes: controlling the first welding mechanism to perform pre-welding on the first connection seam or the second connection seam of the battery cell; controlling the second welding mechanism to perform full welding on the pre-welded first connection seam or the second connection seam.

[0237] In the above manner, the welding quality can be improved.

[0238] According to one or more embodiments of the present application, controlling the first welding mechanism to perform pre-welding on the first connection seam or the second connection seam of the battery cell includes: controlling two relatively arranged pre-welding mechanisms to synchronously perform pre-welding on respective portions of the first connection seam or the second connection seam facing them from both sides of the battery cell; controlling two relatively arranged full-welding mechanisms to synchronously perform full welding on respective portions of the first connection seam or the second connection seam facing them from both sides of the pre-welded battery cell.

[0239] In the above manner, the two first connection seams / the two second connection seams can be welded simultaneously, thereby improving the welding efficiency.

[0240] According to one or more embodiments of the present application, after step S250, it includes: controlling the feeding line to convey the welded battery cell on the corresponding first fixture or second fixture to the rolling assembly (step S300); rolling the welded battery cell by the rolling assembly to roll the solder on the first connection seam or the second connection seam (step S350).

[0241] In the above manner, the weld seams of the first connection seam and the second connection seam can be shaped, improving the surface quality of the weld seams.

[0242] According to one or more embodiments of the present application, step S350 includes: rolling respective portions of the first connection seam and the second connection seam facing them from both sides of the battery cell by two relatively arranged rolling mechanisms, and rolling the flanging of the end cap extending beyond the housing.

[0243] In the above manner, the weld seams of the first connection seam and the second connection seam and the housing can be shaped to improve the surface quality of the battery cell.

[0244] According to one or more embodiments of the present application, after step S250, it includes: controlling the feeding line to convey the welded battery cell on the corresponding first fixture or second fixture to the slag cleaning assembly (step S400); controlling the slag cleaning assembly to clean the slag attached to the welded battery cell, so that the slag detaches from the battery cell (step S450).

[0245] In the above manner, the possibility of foreign matters such as welding slag remaining on the battery cell can be reduced.

[0246] According to one or more embodiments of the present application, after step S250, it includes: controlling the material conveying line to convey the first fixture and the second fixture to the steering assembly (step S500); controlling the steering assembly to pick up the battery cell after welding the first connection seam from the first fixture, turn it, and place it on the second fixture, or pick up the battery cell after welding the second connection seam from the second fixture, turn it, and place it on the first fixture (step S550); controlling the material conveying line to convey the second fixture and the first fixture from the steering assembly to the welding assembly (step S600).

[0247] In the above manner, the steering assembly can place the battery cell placed on the first fixture on the second fixture or place the battery cell placed on the second fixture on the first fixture. When the battery cell is placed on the first fixture, the first connection seam can be welded, and when it is placed on the second fixture, the second connection seam can be welded. In addition, the welding of both the first connection seam and the second connection seam can be completed by the same welding assembly, thereby reducing the cost of the welding device.

[0248] According to one or more embodiments of the present application, before step S600, it includes: controlling the discharging assembly to pick up and discharge the battery cell that has been welded with the first connection seam and the second connection seam from the corresponding first fixture or second fixture; controlling the material conveying line to convey the battery cell that has only been welded with the first connection seam on the corresponding first fixture to the steering assembly, and / or convey the battery cell that has only been welded with the second connection seam on the corresponding second fixture to the steering assembly.

[0249] In the above manner, the welded battery cell can be discharged in a timely manner.

[0250] According to one or more embodiments of the present application, after step S250, it includes: controlling the discharging assembly to pick up and discharge the battery cell that has completed welding from the first fixture or the second fixture.

[0251] In the above manner, automatic discharging can be achieved.

[0252] According to one or more embodiments of the present application, controlling the discharging assembly to pick up and discharge the battery cell that has completed welding from the first fixture or the second fixture includes: controlling the moving mechanism to move the battery cell that has completed welding from the material conveying line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cell outwards.

[0253] In the above manner, discharging is performed through the moving mechanism and the conveying mechanism independent of the material conveying line, reducing the possibility of the material conveying line stopping due to discharging, and thus improving production efficiency.

[0254] According to one or more embodiments of the present application, controlling the transfer mechanism to transfer the battery cells that have completed welding from the feeding line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cells outwards, includes: controlling the transfer mechanism to transfer the battery cells that have completed welding and passed the inspection from the feeding line to the first conveying sub-mechanism; controlling the transfer mechanism to transfer the battery cells that have completed welding and failed the inspection from the feeding line to the second conveying sub-mechanism; controlling the first conveying sub-mechanism to convey the carried battery cells outwards, and controlling the second conveying sub-mechanism to convey the carried battery cells outwards.

[0255] In the above manner, it is possible to separately discharge the qualified and unqualified battery cells, which is conducive to the recycling of unqualified battery cells and the post-treatment of qualified battery cells.

[0256] According to one or more embodiments of the present application, controlling the first conveying sub-mechanism to convey the carried battery cells outwards includes: after a pair of battery cells are stored in the first belt pulling mechanism and / or the second belt pulling mechanism and the pairing is successful, controlling the first belt pulling mechanism and / or the second belt pulling mechanism to move from the handling position to the output position to output the corresponding pair of battery cells outwards.

[0257] In the above manner, the first belt pulling mechanism and the second belt pulling mechanism work simultaneously, which is conducive to improving the efficiency of paired discharging.

[0258] According to one or more embodiments of the present application, after a pair of battery cells are stored in the first belt pulling mechanism and / or the second belt pulling mechanism, controlling the first belt pulling mechanism and / or the second belt pulling mechanism to move from the handling position to the output position to output the corresponding pair of battery cells outwards includes: when a pair of battery cells to be paired are transferred by the transfer mechanism to the first conveying belt and the second conveying belt, controlling the second conveying belt and the second conveying belt to simultaneously move from the handling position to the output position; when a battery cell to be paired is transferred by the transfer mechanism to the second belt pulling mechanism, buffering the other battery cell to be paired through the first buffer belt or the second buffer belt; when there is a battery cell buffered on the first buffer belt, pairing the battery cell stored on the first conveying belt with the battery cell buffered on the first buffer belt, and controlling the first conveying belt and the first buffer belt to move from the handling position to the output position; when there is a battery cell buffered on the second buffer belt, pairing the battery cell stored on the second conveying belt with the battery cell buffered on the second buffer belt, and controlling the second conveying belt and the second buffer belt to move from the handling position to the output position.

[0259] In the above manner, it is possible to improve the pairing efficiency during the discharging process and reduce the risk of delaying paired discharging due to either the first conveying belt or the second conveying belt not storing qualified battery cells.

[0260] An embodiment of the present application further provides a battery cell, which is assembled by the above-mentioned end cap welding device or by the above-mentioned assembly method; wherein, the battery cell includes a housing 101 and an end cap 102, the end cap 102 is arranged at one end of the housing 101, and the connection between the housing 101 and the end cap 102 has a first connection seam and a second connection seam arranged along the circumferential direction of the housing 101, and the housing 101 and the end cap 102 are welded and fixed through the first connection seam and the second connection seam.

[0261] In some embodiments, the housing 101 includes two first side walls arranged oppositely and two second side walls arranged oppositely, and the two first side walls and the two second side walls are arranged alternately along the circumferential direction of the housing 101; the first connection seam is located between the two first side walls along the circumferential direction of the housing 101, and the second connection seam is located between the two second side walls along the circumferential direction of the housing 101.

[0262] According to one or more embodiments of the present application, the end cap welding device 30 of the battery cell 100 includes a feeding assembly 310, a loading assembly 320, a pressing assembly 330, a welding assembly 340, a rolling assembly 350, a welding slag cleaning assembly 360, a post-welding detection assembly 370, a discharging assembly, and a turning assembly 390.

[0263] The feeding assembly 310 includes a feeding line 311, a first fixture 312, and a second fixture 313, and the first fixture 312 and the second fixture 313 are arranged at intervals on the same feeding line 311; the first fixture 312 is configured to fix the housing 101 and expose the first connection seam; the second fixture 313 is configured to fix the housing 101 and expose the second connection seam; the welding assembly 340 is arranged along the feeding line 311, and is used for welding the first connection seam when the first fixture 312 fixing the battery cell 100 is conveyed to the welding assembly 340, and for welding the second connection seam when the second fixture 313 fixing the battery cell 100 is conveyed to the welding assembly 340.

[0264] The material feeding line 311 includes a first conveying sub-line 3111, a second conveying sub-line 3112, a first transfer mechanism 3113 and a second transfer mechanism 3114; the first conveying sub-line 3111 and the second conveying sub-line 3112 are arranged side by side, and the conveying directions of the first conveying sub-line 3111 and the second conveying sub-line 3112 are opposite; the first transfer mechanism is arranged at one end of the first conveying sub-line 3111 and the second conveying sub-line 3112 for transferring the first fixture 312 and the second fixture 313 from the first conveying sub-line 3111 to the first conveying sub-line 3111; the second transfer mechanism 3114 is arranged at the other end of the first conveying sub-line 3111 and the second conveying sub-line 3112 for transferring the first fixture 312 and the second fixture 313 from the second conveying sub-line 3112 to the first conveying sub-line 3111; the welding assembly 340 is arranged along the first conveying sub-line 3111, and the turning assembly 390 is arranged along the second conveying sub-line 3112.

[0265] The first fixture 312 includes a first base 3124, a first carrying mechanism 3121, a first retaining member 3122 and two first side fasteners 3123. The first carrying mechanism 3121 is used for carrying the battery cell 100. The first retaining member 3122 is arranged on the first carrying mechanism 3121 for positioning the battery cell 100 carried on the first carrying mechanism 3121. The two first side fasteners 3123 are arranged oppositely for pre-limiting the battery cell 100 carried on the first carrying mechanism 3121 and disposed between the two first side fasteners 3123. The first carrying mechanism 3121 is slidably arranged on the first base 3124, and the sliding direction of the first carrying mechanism 3121 is perpendicular to the conveying direction of the material feeding line 311.

[0266] The second fixture 313 includes a second base 3134, a second carrying mechanism 3131, a second retaining member 3132 and two second side fasteners 3133; the second carrying mechanism 3131 is used for carrying the battery cell 100. The second retaining member 3132 is arranged on the second carrying mechanism 3131 for positioning the battery cell 100 carried on the second carrying mechanism 3131. The two second side fasteners 3133 are arranged oppositely for pre-limiting the battery cell 100 carried on the second carrying mechanism 3131 and disposed between the two first side fasteners 3123. The second carrying mechanism 3131 is slidably arranged on the second base 3134, and the sliding direction of the second carrying mechanism 3131 is perpendicular to the conveying direction of the material feeding line 311.

[0267] The welding assembly 340 includes a first welding mechanism 341 and a second welding mechanism 342, which are arranged at intervals along the feeding line 311; the first welding mechanism 341 is used to pre-weld the first connection seam or the second connection seam, and the second welding mechanism 342 is used to further weld the first connection seam or the second connection seam after pre-welding. The first welding mechanism 341 includes two pre-welding mechanisms, which are arranged on both sides of the feeding line 311; the second welding mechanism 342 includes two full welding mechanisms 3421, which are arranged on both sides of the feeding line 311; the two pre-welding mechanisms are used to pre-weld the first connection seam or the second connection seam in their respective directions, and the two full welding mechanisms 3421 are used to fully weld the first connection seam or the second connection seam in their respective directions. The second welding mechanism 342 is used to perform a first welding on the first connection seam or the second connection seam after pre-welding from a first direction, and a second welding on the first connection seam or the second connection seam after the first welding from a second direction, and the first direction and the second direction are opposite.

[0268] The welding assembly 340 includes at least one full welding mechanism 3421, which is used to fully weld the first connecting seam or the second connecting seam.

[0269] The steering assembly 390 is arranged along the feeding line 311 and is spaced apart from the welding assembly 340; the feeding line 311 is used to transport the first clamp 312 and the second clamp 313 from the welding assembly 340 to the steering assembly 390, and then transport them to the welding assembly 340 after passing through the steering assembly 390; the steering assembly 390 is used to remove the battery cell 100 after welding the first connecting seam from the corresponding first clamp 312 and turn it, and place it on the second clamp 313 after turning; or, the steering assembly 390 is used to remove the battery cell 100 after welding the second connecting seam from the corresponding second clamp 313 and turn it, and place it on the first clamp 312 after turning. The steering assembly 390 includes a support frame 391, a clamping mechanism 392, a steering motor 393, a lifting frame 394 and a lifting motor 395; the support frame 391 is arranged on the outside of the feed line 311, the clamping mechanism 392 is located above the feed line 311, and is rotatably supported on the support frame 391; the steering motor 393 is transmission-connected with the clamping mechanism 392, and is used to drive the clamping mechanism 392 to rotate relative to the support frame 391 for steering; the clamping mechanism 392 is used to clamp the battery cell 100 and steer the battery cell 100, the lifting frame 394 is liftably supported on the support frame 391, and the clamping mechanism is rotatably arranged on the lifting frame 394; the lifting motor 395 is arranged on the support frame 391 or the lifting frame 394, and is transmission-connected with the lifting frame 394, and is used to drive the lifting frame 394 to rise and fall relative to the support frame 391.

[0270] The rolling assembly 350 is spaced apart from the welding assembly 340 and is used to roll the battery cell 100 after being welded by the welding assembly 340, so as to roll the solder on the first connection seam or the second connection seam. The rolling assembly 350 includes two rolling mechanisms 351, and the two rolling mechanisms 351 are oppositely arranged on both sides of the feeding line 311; the two rolling mechanisms 351 are used to press the battery cell 100 from both sides of the feeding line 311, so as to roll the first connection seam or the second connection seam, and the flanging of the end cover 102 extending beyond the housing 101. Each rolling mechanism 351 includes a bracket 3511 and two roller wheels 3512. The bracket 3511 is arranged outside the feeding line 311, and the two roller wheels 3512 are spaced apart along the extending direction of the feeding line 311 on the bracket 3511, so that the battery cell 100 can pass through the two roller wheels 3512 in sequence; the two roller wheels 3512 are rotatably arranged on the bracket 3511 to roll the battery cell 100.

[0271] The welding slag cleaning assembly 360 is spaced apart from the welding assembly 340 along the feeding line 311 and is used to clean the welding slag on the battery cell 100 after being welded by the welding assembly 340, so that the welding slag is separated from the battery cell 100.

[0272] The post-welding inspection assembly 370 is arranged along the feeding line between the welding assembly 340 and the transfer mechanism 381, and the post-welding inspection assembly 370 is used to detect whether the welded battery cell 100 is qualified.

[0273] The press-fitting assembly 330 is spaced apart from the welding assembly 340 along the feeding line 311. The press-fitting assembly 330 is used to press-fit the housing 101 and the end cover 102 before the battery cell 100 is conveyed to the welding assembly 340; the welding assembly 340 is used to weld the battery cell 100 after being press-fitted.

[0274] The loading assembly 320 is spaced apart from the feeding line 311. The loading assembly 320 is used to place the battery cell 100 to be loaded and welded onto the first fixture 312 or the second fixture 313. The loading assembly 320 includes a storage mechanism 321 and a loading mechanism 322. The storage mechanism 321 is used to store the battery cells 100 to be loaded and welded; the loading mechanism 322 is arranged along the feeding line 311, and the loading mechanism 322 is used to take out the corresponding battery cell 100 from the storage mechanism 321 and place the battery cell 100 onto the first fixture 312 or the second fixture 313. The storage mechanism 321 is used to store the battery cells 100 in a predetermined placement posture relative to the feeding line 311. The loading mechanism 322 is used to take out the battery cell 100 in the predetermined placement posture from the storage mechanism 321 and convey the battery cell 100 to the first fixture 312 while maintaining the predetermined placement posture, and the predetermined placement posture is consistent with the fixed posture required by the first fixture 312.

[0275] The discharging assembly is arranged at an interval from the material conveying line 311, and the discharging assembly is used to take out the battery monomers 100 that have completed welding from the material conveying line 311 and convey them outwards. The discharging assembly includes a moving mechanism 381 and a conveying mechanism 382. The moving mechanism 381 is arranged along the material conveying line 311 and is used to move the battery monomers 100 that have completed welding from the material conveying line to the conveying mechanism 382. The conveying mechanism 382 is used to convey the corresponding battery monomers 100 outwards. The conveying mechanism 382 includes a first conveying sub-mechanism 383 and a second conveying sub-mechanism 384. The moving mechanism 381 is used to move the battery monomers 100 that have completed welding and passed the inspection from the material conveying line 311 to the first conveying sub-mechanism 383, and move the battery monomers 100 that have completed welding and failed the inspection from the material conveying line 311 to the second conveying sub-mechanism 384. The first conveying sub-mechanism 383 and the second conveying sub-mechanism 384 are used to convey the battery monomers 100 carried by them outwards respectively. The first conveying sub-mechanism 383 includes a first belt pulling mechanism 3830 and a second belt pulling mechanism 3835. The first belt pulling mechanism 3830 and the second belt pulling mechanism 3835 can move relative to the moving mechanism 381 and can move between a handling position and an output position. The first belt pulling mechanism 3830 and the second belt pulling mechanism 3835 are used to move to or away from the output position. The first belt pulling mechanism 3830 and the second belt pulling mechanism 3835 store the battery monomers 100 moved by the moving mechanism 381 when in the output position. The first belt pulling mechanism 3830 and / or the second belt pulling mechanism 3835 are used to store the battery monomers 100 and move to the output position to output the corresponding pair of battery monomers 100 after a pair of battery monomers 100 are successfully paired.The first belt pulling mechanism 3830 includes a first conveying belt 3831 and a first buffer belt 3832; the second belt pulling mechanism 3835 includes a second conveying belt 3836 and a second buffer belt 3837; the first conveying belt 3831 and the first buffer belt 3832 are arranged side by side, and the second conveying belt 3836 and the second buffer belt 3837 are arranged side by side; the first conveying belt 3831 and the second conveying belt 3836 are arranged side by side and at intervals, and are located on both sides of the output position; the first conveying belt 3831 and the first buffer belt 3832 can move together towards the output position or away from the output position; the second conveying belt 3836 and the second buffer belt 3837 can move together towards the output position or away from the output position; the first buffer belt 3832 and the second buffer belt 3837 are respectively used to buffer another battery cell 100 to be paired when a battery cell 100 to be paired is moved to the second belt pulling mechanism 3835; the first conveying belt 3831 and the second conveying belt 3836 are respectively used to store the battery cells 100 to be paired; when the first buffer belt 3832 buffers a battery cell 100, the battery cell 100 stored on the first conveying belt 3831 is paired with the battery cell 100 buffered on the first buffer belt 3832; when the second buffer belt 3837 buffers a battery cell 100, the battery cell 100 stored on the second conveying belt 3836 is paired with the battery cell 100 buffered on the second buffer belt 3837; when the first buffer belt 3832 does not buffer a battery cell 100 and the second buffer belt 3837 does not buffer a battery cell 100, the battery cell 100 stored on the first conveying belt 3831 is paired with the battery cell 100 stored on the second conveying belt 3836.

[0276] According to one or more embodiments of the present application, the assembly method of a battery cell includes: Step S100: Loading the battery cell onto a first fixture or a second fixture on the same feeding line; the first fixture is used to fix the housing 101 and expose the first connection seam; the second fixture is used to fix the housing and expose the second connection seam; Step S200: Controlling the feeding line to convey the first fixture and the second fixture to the welding assembly; Step S250: Controlling the welding assembly to weld the first connection seam of the battery cell fixed on the first fixture, or to weld the second connection seam of the battery cell fixed on the second fixture; Step S300: Controlling the feeding line to convey the welded battery cell on the corresponding first fixture or second fixture to the rolling assembly; Step S350: Rolling the welded battery cell through the rolling assembly to roll the solder on the first connection seam or the second connection seam; Step S400: Controlling the feeding line to convey the welded battery cell on the corresponding first fixture or second fixture to the welding slag cleaning assembly; Step S450: Controlling the welding slag cleaning assembly to clean the welding slag attached to the welded battery cell, so that the welding slag detaches from the battery cell; Step S500: Controlling the feeding line to convey the first fixture and the second fixture to the turning assembly; Step S550: Controlling the turning assembly to take out and turn the battery cell after welding the first connection seam from the first fixture and place it on the second fixture, or to take out and turn the battery cell after welding the second connection seam from the second fixture and place it on the first fixture; Step S600: Controlling the feeding line to convey the second fixture and the first fixture from the turning assembly to the welding assembly.

[0277] Before step S200, it includes: Controlling the press-fitting assembly to press-fit the battery cell loaded onto the first fixture or the second fixture to press-fit the housing and the end cover.

[0278] Step S250 includes: Controlling the first welding mechanism to pre-weld the first connection seam or the second connection seam of the battery cell; Controlling the second welding mechanism to fully weld the pre-welded first connection seam or the second connection seam. Controlling the first welding mechanism to pre-weld the first connection seam or the second connection seam of the battery cell includes: Controlling two relatively arranged pre-welding mechanisms to synchronously pre-weld the respective parts of the first connection seam or the second connection seam facing them from both sides of the battery cell; Controlling two relatively arranged full-welding mechanisms to synchronously fully weld the respective parts of the first connection seam or the second connection seam facing them from both sides of the pre-welded battery cell.

[0279] After step S250, it includes: Controlling the discharging assembly to take out and unload the battery cell that has completed welding from the first fixture or the second fixture.

[0280] Step S350 includes: Rolling the respective parts of the first connection seam and the second connection seam facing them from both sides of the battery cell through two relatively arranged rolling mechanisms, and rolling the flanging of the end cover extending beyond the housing.

[0281] Before step S500, it includes: controlling the discharging component to take out and discharge the battery cell with the first and second seams welded from the corresponding first fixture or second fixture; controlling the feeding line to convey the battery cell with only the first seam welded on the corresponding first fixture to the steering component, and / or convey the battery cell with only the second seam welded on the corresponding second fixture to the steering component. Controlling the discharging component to take out and discharge the battery cell that has completed welding from the first fixture or the second fixture includes: controlling the moving mechanism to move the battery cell that has completed welding from the feeding line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cell outwards. Controlling the moving mechanism to move the battery cell that has completed welding from the feeding line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cell outwards includes: controlling the moving mechanism to move the battery cell that has completed welding and passed the inspection from the feeding line to the first conveying sub-mechanism; controlling the moving mechanism to move the battery cell that has completed welding and failed the inspection from the feeding line to the second conveying sub-mechanism; controlling the first conveying sub-mechanism to convey the battery cell carried thereon outwards, and controlling the second conveying sub-mechanism to convey the battery cell carried thereon outwards. Controlling the first conveying sub-mechanism to convey the battery cell carried thereon outwards includes: after a pair of battery cells are stored in the first pulling belt mechanism and / or the second pulling belt mechanism and the pairing is successful, controlling the first pulling belt mechanism and / or the second pulling belt mechanism to move from the handling position to the output position to output the corresponding pair of battery cells outwards. After a pair of battery cells are stored in the first pulling belt mechanism and / or the second pulling belt mechanism, controlling the first pulling belt mechanism and / or the second pulling belt mechanism to move from the handling position to the output position to output the corresponding pair of battery cells outwards includes: when a pair of battery cells to be paired are moved by the moving mechanism to the first conveying belt and the second conveying belt, controlling the second conveying belt and the second conveying belt to move from the handling position to the output position simultaneously; when a battery cell to be paired is moved by the moving mechanism to the second pulling belt mechanism, caching the other battery cell to be paired through the first buffer belt or the second buffer belt; when there is a battery cell cached on the first buffer belt, pairing the battery cell stored on the first conveying belt with the battery cell cached on the first buffer belt, and controlling the first conveying belt and the first buffer belt to move from the handling position to the output position; when there is a battery cell cached on the second buffer belt, pairing the battery cell stored on the second conveying belt with the battery cell cached on the second buffer belt, and controlling the second conveying belt and the second buffer belt to move from the handling position to the output position.

[0282] In a specific embodiment, the assembly method may first weld the first seam and then weld the second seam.

[0283] Specifically, the assembly method may include: loading a battery cell onto a first fixture on a conveying line to make the first connection seam of the battery cell visible; controlling a press-fitting assembly to press-fit the battery cell loaded onto the first fixture to press-fit the housing and the end cover, and after the press-fitting is completed, switching the first holding member of the first fixture from a released state to a holding state; controlling the conveying line to convey the first fixture to a welding assembly; controlling the welding assembly to weld the first connection seam of the battery cell fixed on the first fixture; controlling the conveying line to convey the battery cell with the first connection seam welded thereon on the corresponding first fixture to a rolling assembly; rolling the battery cell with the first connection seam welded thereon by the rolling assembly to roll the solder on the first connection seam; controlling the conveying line to convey the battery cell with the first connection seam welded thereon on the corresponding first fixture to a welding slag cleaning assembly; controlling the welding slag cleaning assembly to clean the welding slag attached to the welded battery cell to make the welding slag separate from the battery cell; detecting whether the first connection seam is qualified through a post-welding detection assembly; controlling the conveying line to convey the first fixture and a second fixture to a turning assembly; controlling the first holding member of the first fixture to switch from a holding state to a released state, and controlling the turning assembly to take out, turn and place the battery cell after welding the first connection seam from the first fixture onto the second fixture to make the second connection seam of the battery cell visible; positioning the battery cell placed on the second fixture through a positioning assembly, and after positioning, switching the second holding member of the second fixture from a released state to a holding state; controlling the conveying line to convey the second fixture to the welding assembly; controlling the welding assembly to weld the second connection seam of the battery cell fixed on the second fixture; controlling the conveying line to convey the battery cell with the second connection seam welded thereon on the corresponding second fixture to the rolling assembly; rolling the battery cell with the second connection seam welded thereon by the rolling assembly to roll the solder on the second connection seam; controlling the conveying line to convey the battery cell with the second connection seam welded thereon on the corresponding second fixture to the welding slag cleaning assembly; controlling the welding slag cleaning assembly to clean the welding slag attached to the welded battery cell to make the welding slag separate from the battery cell; detecting whether the second connection seam is qualified through the post-welding detection assembly; controlling a discharging assembly to take out the battery cell with the first connection seam and the second connection seam welded thereon from the corresponding second fixture; placing the qualified battery cells on a first conveying sub-mechanism for paired blanking, and placing the unqualified battery cells on a second conveying sub-mechanism for blanking.

[0284] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various 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. An end cap welding device, It is characterized in that The battery cell comprises a shell and an end cover, wherein the end cover is arranged at one end of the shell, and a connection between the shell and the end cover comprises a first connection seam and a second connection seam arranged along the circumference of the shell, and the end cover welding device comprises: A material feeding assembly, comprising a material feeding line, a first clamp and a second clamp, wherein the first clamp and the second clamp are arranged on the same material feeding line at intervals; the first clamp is arranged to fix the shell and expose the first connection seam; the second clamp is arranged to fix the shell and expose the second connection seam; A welding assembly is arranged along the feeding line, and is used to weld the first connecting seam when the first clamp fixing the battery cell is conveyed to the welding assembly, and is used to weld the second connecting seam when the second clamp fixing the battery cell is conveyed to the welding assembly.

2. The end cap welding device according to claim 1, It is characterized in that The end cap welding device comprises a steering assembly, which is arranged along the feeding line and spaced apart from the welding assembly; the feeding line is used to transport the first fixture and the second fixture from the welding assembly to the steering assembly, and then transport them to the welding assembly after passing through the steering assembly; The steering assembly is used to remove the battery cell from the corresponding first fixture and turn it after welding the first connecting seam, and place it on the second fixture after turning; or, the steering assembly is used to remove the battery cell from the corresponding second fixture and turn it after welding the second connecting seam, and place it on the first fixture after turning.

3. The end cap welding device according to claim 2, It is characterized in that The steering assembly includes a support frame, a clamping mechanism and a steering motor; the support frame is arranged outside the feeding line, the clamping mechanism is located above the feeding line and is rotatably supported on the support frame; The steering motor is in driving connection with the clamping mechanism and is used for driving the clamping mechanism to rotate relative to the support frame for steering; the clamping mechanism is used for clamping the battery cell and steering the battery cell.

4. The end cap welding device according to claim 3, It is characterized in that The steering assembly includes a lifting frame and a lifting motor. The lifting frame is supported on the support frame in a liftable manner, and the clamping mechanism is rotatably arranged on the lifting frame. The lifting motor is arranged on the support frame or the lifting frame and is transmission-connected to the lifting frame for driving the lifting frame to rise and fall relative to the support frame.

5. The end cap welding device according to claim 2, It is characterized in that The material feeding line includes a first conveying sub-line, a second conveying sub-line, a first transfer mechanism, and a second transfer mechanism; the first conveying sub-line and the second conveying sub-line are arranged side by side, and the conveying directions of the first conveying sub-line and the second conveying sub-line are opposite; the first transfer mechanism is arranged at one end of the first conveying sub-line and the second conveying sub-line for transferring the first fixture and the second fixture from the first conveying sub-line to the first conveying sub-line; the second transfer mechanism is arranged at the other end of the first conveying sub-line and the second conveying sub-line for transferring the first fixture and the second fixture from the second conveying sub-line to the first conveying sub-line; the welding assembly is arranged along the first conveying sub-line, and the turning assembly is arranged along the second conveying sub-line.

6. The end cover welding device according to claim 1, wherein, the welding assembly includes a first welding mechanism and a second welding mechanism, and the first welding mechanism and the second welding mechanism are arranged at intervals along the material feeding line; the first welding mechanism is used for pre-welding the first connection seam or the second connection seam, and the second welding mechanism is used for further welding the first connection seam or the second connection seam after pre-welding.

7. The end cover welding device according to claim 6, wherein, the first welding mechanism includes two pre-welding mechanisms, and the two pre-welding mechanisms are oppositely arranged on both sides of the material feeding line; the second welding mechanism includes two full-welding mechanisms, and the two full-welding mechanisms are oppositely arranged on both sides of the material feeding line; the two pre-welding mechanisms are used for pre-welding the respective parts of the first connection seam or the second connection seam they face, and the two full-welding mechanisms are used for full-welding the respective parts of the first connection seam or the second connection seam they face.

8. The end cover welding device according to claim 7, wherein, the second welding mechanism is used for performing the first welding on the first connection seam or the second connection seam after pre-welding from a first direction, and performing the second welding on the first connection seam or the second connection seam after the first welding from a second direction, and the first direction and the second direction are opposite.

9. The end cover welding device according to claim 1, wherein, the welding assembly includes at least one full-welding mechanism, and the full-welding mechanism is used for full-welding the first connection seam or the second connection seam.

10. The end cover welding device according to claim 1, wherein, the end cover welding device includes a rolling press assembly, and the rolling press assembly is arranged at an interval from the welding assembly for rolling the battery cell after being welded by the welding assembly to roll the solder on the first connection seam or the second connection seam.

11. The end cover welding device according to claim 10, wherein, The rolling assembly includes two rolling mechanisms, which are oppositely arranged on both sides of the material conveying line; the two rolling mechanisms are used to press the battery cell from both sides of the material conveying line, so as to roll the first connection seam or the second connection seam, and the flanging of the end cover extending beyond the housing.

12. The end cover welding device according to claim 11, characterized in that each of the rolling mechanisms includes a bracket and two rollers. The bracket is arranged outside the material conveying line, and the two rollers are arranged on the bracket at intervals along the extending direction of the material conveying line, so that the battery cell can pass through the two rollers in sequence; the two rollers are rotatably arranged on the bracket to roll the battery cell.

13. The end cover welding device according to claim 1, characterized in that the end cover welding device includes a welding slag cleaning assembly, which is arranged at an interval along the material conveying line from the welding assembly, and is used to clean the welding slag on the battery cell after being welded by the welding assembly, so that the welding slag is separated from the battery cell.

14. The end cover welding device according to claim 1, characterized in that the end cover welding device includes a press-fitting assembly, which is arranged at an interval along the material conveying line from the welding assembly. The press-fitting assembly is used to press-fit the housing and the end cover before the battery cell is conveyed to the welding assembly; the welding assembly is used to weld the battery cell after being press-fitted.

15. The end cover welding device according to claim 1, characterized in that the end cover welding device includes a feeding assembly, which is arranged at an interval from the material conveying line. The feeding assembly is used to place the battery cell to be welded and fed onto the first fixture or the second fixture.

16. The end cover welding device according to claim 15, characterized in that the feeding assembly includes a storage mechanism and a feeding mechanism. The storage mechanism is used to store the battery cells to be welded and fed; the feeding mechanism is arranged along the material conveying line, and is used to take out the corresponding battery cells from the storage mechanism and place the battery cells onto the first fixture or the second fixture.

17. The end cover welding device according to claim 16, characterized in that the storage mechanism is used to store the battery cells in a predetermined placement posture relative to the material conveying line. The feeding mechanism is used to take out the battery cells in the predetermined placement posture from the storage mechanism and convey the battery cells to the first fixture while maintaining the predetermined placement posture. The predetermined placement posture is consistent with the fixed posture required by the first fixture.

18. The end cover welding device according to claim 1, characterized in that the end cover welding device includes a discharging assembly, which is arranged at an interval from the material conveying line. The discharging assembly is used to take out the battery cells that have been welded from the material conveying line and convey them outwards.

19. The end cover welding device according to claim 18, characterized in that The discharging assembly includes a transfer mechanism and a conveying mechanism. The transfer mechanism is arranged along the material conveying line and is used to transfer the battery cell that has completed welding from the material conveying line to the conveying mechanism. The conveying mechanism is used to convey the corresponding battery cell outwards.

20. The end cover welding device according to claim 19, wherein, the conveying mechanism includes a first conveying sub-mechanism and a second conveying sub-mechanism. The transfer mechanism is used to transfer the battery cell that has completed welding and passed the inspection from the material conveying line to the first conveying sub-mechanism, and transfer the battery cell that has completed welding and failed the inspection from the material conveying line to the second conveying sub-mechanism; the first conveying sub-mechanism and the second conveying sub-mechanism are used to convey the battery cells they carry outwards respectively.

21. The end cover welding device according to claim 20, wherein, the first conveying sub-mechanism includes a first pulling belt mechanism and a second pulling belt mechanism. The first pulling belt mechanism and the second pulling belt mechanism can move relative to the transfer mechanism and can move between a handling position and an output position. The first pulling belt mechanism and the second pulling belt mechanism are used to move to or away from the output position; when the first pulling belt mechanism and the second pulling belt mechanism are at the output position, they store the battery cells transferred by the transfer mechanism; the first pulling belt mechanism and / or the second pulling belt mechanism are used to store the battery cells and move to the output position to output a corresponding pair of battery cells after a pair of battery cells are successfully paired.

22. The end cover welding device according to claim 21, wherein, the first pulling belt mechanism includes a first conveying pulling belt and a first buffer pulling belt; the second pulling belt mechanism includes a second conveying pulling belt and a second buffer pulling belt; the first conveying pulling belt and the first buffer pulling belt are arranged side by side, and the second conveying pulling belt and the second buffer pulling belt are arranged side by side; the first conveying pulling belt and the second conveying pulling belt are arranged side by side and at intervals, and are located on both sides of the output position; the first conveying pulling belt and the first buffer pulling belt can move together towards or away from the output position; the second conveying pulling belt and the second buffer pulling belt can move together towards or away from the output position; The first buffer belt and the second buffer belt are respectively used to buffer another battery cell to be paired when one battery cell to be paired is moved to the second belt mechanism; the first conveying belt and the second conveying belt are respectively used to store the battery cells to be paired; when the first buffer belt buffers the battery cells, the battery cells stored on the first conveying belt are paired with the battery cells buffered on the first buffer belt; when the second buffer belt buffers the battery cells, the battery cells stored on the second conveying belt are paired with the battery cells buffered on the second buffer belt; when the first buffer belt does not buffer the battery cells and the second buffer belt does not buffer the battery cells, the battery cells stored on the first conveying belt are paired with the battery cells stored on the second conveying belt.

23. The end cap welding device according to claim 19, characterized in that the end cap welding device includes a post-welding detection component, the post-welding detection component is arranged between the welding component and the moving mechanism along the material conveying line, and the post-welding detection component is used to detect whether the welded battery cells are qualified.

24. The end cap welding device according to claim 1, characterized in that the first fixture includes a first carrying mechanism and a first holding member, the first carrying mechanism is used to carry the battery cell, and the first holding member is arranged on the first carrying mechanism and is used to position the battery cell carried on the first carrying mechanism; the second fixture includes a second carrying mechanism and a second holding member; the second carrying mechanism is used to carry the battery cell, and the second holding member is arranged on the second carrying mechanism and is used to position the battery cell carried on the second carrying mechanism.

25. The end cap welding device according to claim 24, characterized in that the first fixture further includes two first side buckles, the two first side buckles are arranged oppositely and are used to pre-limit the battery cell carried on the first carrying mechanism and located between the two first side buckles, the second fixture further includes two second side buckles, the two second side buckles are arranged oppositely and are used to pre-limit the battery cell carried on the second carrying mechanism and located between the two first side buckles.

26. The end cap welding device according to claim 24, characterized in that the first fixture further includes a first base, the first carrying mechanism is slidably arranged on the first base, and the sliding direction of the first carrying mechanism is perpendicular to the conveying direction of the material conveying line; the second fixture further includes a second base, the second carrying mechanism is slidably arranged on the second base, and the sliding direction of the second carrying mechanism is perpendicular to the conveying direction of the material conveying line.

27. The end cap welding device according to claim 1, characterized in that the housing includes two first side walls arranged oppositely and two second side walls arranged oppositely, and the two first side walls and the two second side walls are arranged alternately along the circumferential direction of the housing; The first connection seam is located between the two first side walls along the circumferential direction of the shell, and the second connection seam is located between the two second side walls along the circumferential direction of the shell.

28. A battery assembly system, It is characterized in that The battery comprises a shell, an end cover and an electrode assembly; the shell has an open end, a pole is arranged on a wall of the shell opposite to the open end, the pole has a through hole, the shell and the end cover are connected to form a receiving cavity connected to the through hole; the active material coating part of the electrode assembly is arranged in the shell, and the pole ear part of the electrode assembly passes through the through hole and is connected to a side of the pole away from the receiving cavity; The battery assembly system comprises a conveying device and an assembly device, wherein the conveying device is used to convey the structure to be assembled to each station of the assembly device; the stations of the assembly device at least comprise a tab welding device, a shell insertion device, a tab insertion device, a pole welding device and an end cap welding device according to any one of claims 1 to 27; Among them, the pole ear welding device is used to weld multiple pole ear sheets of the electrode assembly to form a pole ear part; the shell insertion device is used to load the electrode assembly into the shell from the open end; the pole ear penetration device is used to clamp the pole ear part through the through hole when the electrode assembly is loaded into the shell; the pole column welding device is used to weld the pole ear part passing through the through hole to the side of the pole away from the accommodating cavity.

29. An assembly method, It is characterized in that The battery cell comprises a shell and an end cover, wherein the end cover is arranged at one end of the shell, and a connection between the shell and the end cover comprises a first connection seam and a second connection seam arranged along the circumference of the shell, and the assembly method comprises: Loading the battery cell to a first clamp or a second clamp on the same feeding line; the first clamp is used to fix the shell and expose the first connection seam; the second clamp is used to fix the shell and expose the second connection seam; Controlling the feeding line to transport the first fixture and the second fixture to the welding assembly; The welding assembly is controlled to weld the first connection seam of the battery cell fixed on the first clamp, or to weld the second connection seam of the battery cell fixed on the second clamp.

30. The assembly method according to claim 29, It is characterized in that After controlling the welding assembly to weld the first connection seam of the battery cell fixed on the first fixture, or welding the second connection seam of the battery cell fixed on the second fixture, the method includes: Controlling the feeding line to convey the first clamp and the second clamp to the steering assembly; Control the steering assembly to remove the battery cell after welding the first connection seam from the first fixture, turn it, and place it on the second fixture, or remove the battery cell after welding the second connection seam from the second fixture, turn it, and place it on the first fixture; The feeding line is controlled to transport the second clamp and the first clamp from the steering assembly to the welding assembly.

31. The assembly method according to claim 30, wherein, before controlling the material conveying line to convey the first fixture and the second fixture to the steering assembly, it includes: controlling the discharging assembly to take out and discharge the battery cell with the first seam and the second seam welded from the corresponding first fixture or second fixture; controlling the material conveying line to convey the battery cell with only the first seam welded on the corresponding first fixture to the steering assembly, and / or convey the battery cell with only the second seam welded on the corresponding second fixture to the steering assembly.

32. The assembly method according to claim 29, wherein, the controlling the welding assembly to weld the first seam of the battery cell fixed on the first fixture, or the second seam of the battery cell fixed on the second fixture, includes: controlling the first welding mechanism to pre-weld the first seam or the second seam of the battery cell; controlling the second welding mechanism to fully weld the pre-welded first seam or second seam.

33. The assembly method according to claim 32, wherein, the controlling the first welding mechanism to pre-weld the first seam or the second seam of the battery cell includes: controlling two relatively arranged pre-welding mechanisms to synchronously pre-weld the respective parts of the first seam or the second seam facing them from both sides of the battery cell; controlling two relatively arranged full-welding mechanisms to synchronously fully weld the respective parts of the first seam or the second seam facing them from both sides of the pre-welded battery cell.

34. The assembly method according to claim 29, wherein, after controlling the welding assembly to weld the first seam of the battery cell fixed on the first fixture, or the second seam of the battery cell fixed on the second fixture, it includes: controlling the material conveying line to convey the welded battery cell on the corresponding first fixture or second fixture to the rolling press assembly; rolling the welded battery cell through the rolling press assembly to roll the solder on the first seam or the second seam.

35. The assembly method according to claim 34, wherein, the rolling the welded battery cell through the rolling press assembly to roll the solder on the first seam or the second seam includes: rolling the respective parts of the first seam and the second seam facing them from both sides of the battery cell through two relatively arranged rolling mechanisms, and rolling the flanging of the end cover extending beyond the housing.

36. The assembly method according to claim 29, wherein, After controlling the welding assembly to weld the first joint of the battery cell fixed on the first fixture or the second joint of the battery cell fixed on the second fixture, it includes: Controlling the material conveying line to convey the welded battery cell on the corresponding first fixture or second fixture to the welding slag cleaning assembly; Controlling the welding slag cleaning assembly to clean the welding slag attached to the welded battery cell, so that the welding slag detaches from the battery cell.

37. The assembly method according to claim 29, wherein, When controlling the material conveying line to convey the first fixture and the second fixture to the welding assembly, it includes: Controlling the press-fitting assembly to press-fit the battery cell loaded onto the first fixture or the second fixture to press-fit the housing and the end cover.

38. The assembly method according to claim 29, wherein, After controlling the welding assembly to weld the first joint of the battery cell fixed on the first fixture or the second joint of the battery cell fixed on the second fixture, it includes: Controlling the discharging assembly to take out and discharge the battery cell that has completed welding from the first fixture or the second fixture.

39. The assembly method according to claim 38, wherein, The controlling the discharging assembly to take out and discharge the battery cell that has completed welding from the first fixture or the second fixture includes: Controlling the transfer mechanism to transfer the battery cell that has completed welding from the material conveying line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cell outwards.

40. The assembly method according to claim 39, wherein, The controlling the transfer mechanism to transfer the battery cell that has completed welding from the material conveying line to the conveying mechanism, and controlling the conveying mechanism to convey the corresponding battery cell outwards includes: Controlling the transfer mechanism to transfer the battery cell that has completed welding and passed the inspection from the material conveying line to the first conveying sub-mechanism; Controlling the transfer mechanism to transfer the battery cell that has completed welding and failed the inspection from the material conveying line to the second conveying sub-mechanism; Controlling the first conveying sub-mechanism to convey the carried battery cell outwards, and controlling the second conveying sub-mechanism to convey the carried battery cell outwards.

41. The assembly method according to claim 40, wherein, The controlling the first conveying sub-mechanism to convey the carried battery cell outwards includes: After a pair of battery cells are stored in the first belt mechanism and / or the second belt mechanism and the pairing is successful, controlling the first belt mechanism and / or the second belt mechanism to move from the handling position to the output position to output the corresponding pair of battery cells outwards.

42. The assembly method according to claim 41, wherein, After a pair of battery cells are stored in the first belt pulling mechanism and / or the second belt pulling mechanism, controlling the first belt pulling mechanism and / or the second belt pulling mechanism to move from the handling position to the output position to output the corresponding pair of battery cells outward, includes: When a pair of the battery cells to be paired are moved by the moving mechanism to the first conveying belt and the second conveying belt, controlling the second conveying belt and the second conveying belt to move from the handling position to the output position simultaneously; When one of the battery cells to be paired is moved by the moving mechanism to the second belt pulling mechanism, caching the other battery cell to be paired through the first buffer belt or the second buffer belt; When the battery cell is cached on the first buffer belt, pairing the battery cell stored on the first conveying belt with the battery cell cached on the first buffer belt, and controlling the first conveying belt and the first buffer belt to move from the handling position to the output position; When the battery cell is cached on the second buffer belt, pairing the battery cell stored on the second conveying belt with the battery cell cached on the second buffer belt, and controlling the second conveying belt and the second buffer belt to move from the handling position to the output position.

43. A battery cell, characterized in that, it is obtained by assembling with the end cap welding device according to any one of claims 1-27 or the battery assembly system according to claim 28, or by the assembling method according to any one of claims 29-42; wherein, the battery cell includes a housing and an end cap, the end cap is arranged at one end of the housing, and a first connection seam and a second connection seam are arranged along the circumferential direction of the housing at the connection between the housing and the end cap, and the housing and the end cap are welded and fixed through the first connection seam and the second connection seam.

44. The battery cell according to claim 43, characterized in that, the housing includes two first side walls arranged oppositely and two second side walls arranged oppositely, and the two first side walls and the two second side walls are arranged alternately along the circumferential direction of the housing; the first connection seam is located between the two first side walls along the circumferential direction of the housing, and the second connection seam is located between the two second side walls along the circumferential direction of the housing.

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