Method, device and welding system for laser welding of battery pack pole and integrated busbar

Abstract

The invention discloses a method, a device and a welding system for laser welding of a battery pack pole and an integrated busbar. The method is applied to a welding system, and the method can be used for measuring the center point coordinates of each battery cell pole in a to-be-welded battery pack and the center point coordinates of each CCS corresponding to each battery cell pole one by one; comparing the center point coordinates of the battery cell poles with the center point coordinates of the corresponding CCS one by one, and judging whether the welding conditions are met or not; compressing each first CCS meeting the welding condition, measuring a first welding distance between the welding surface of each compressed first CCS and a preset calibration focus position, and generating a CCS height set based on each first welding distance; according to the method, whether each first welding distance in the CCS height set is equal to the preset calibrated welding distance or not is judged, each first CCS corresponding to the equal first welding distance is welded with the corresponding battery cell pole, manual and automatic welding is not needed, and the welding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and in particular to a method, device and welding system for laser welding a battery pack pole and a CCS (Cells Contact System, integrated busbar). Background Art

[0002] At present, with the development of new energy vehicles, the requirements for power batteries are getting higher and higher. Since the more power a power battery pack can store, the longer the battery life will be, the existing battery pack will stack multiple cells together, and then connect them in series through laser welding of cell poles and CCS (Cells Contact System, integrated busbar) to provide more power for new energy vehicles.

[0003] However, with the increase in the number of battery modules and the number of battery cells in the battery pack, there will be a deviation between the center of each battery column and the corresponding CCS center during the battery cell stacking process. At the same time, the deviation will accumulate, resulting in inaccurate positioning problems, which will cause the battery column and CCS to exceed the surface of the battery column when welding.

[0004] Currently, the battery cell poles and CCS are manually aligned for welding, but the number of battery cells is very large, which results in low welding efficiency. Summary of the invention

[0005] The present invention provides a method, device and welding system for laser welding of a battery pack pole and an integrated busbar to improve welding efficiency. The specific technical solution is as follows.

[0006] In a first aspect, the present invention provides a method for laser welding a battery pack pole and an integrated busbar, the method being applied to a welding system, the method comprising:

[0007] Measure and obtain the center point coordinates of each battery cell pole in the battery pack to be welded, as well as the center point coordinates of each CCS corresponding to each battery cell pole;

[0008] Compare the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether they meet the welding conditions;

[0009] Compacting each first CCS meeting the welding condition, measuring a first welding distance between a welding surface of each first CCS after compaction and a preset calibration focus position, and generating a CCS height set based on each first welding distance;

[0010] It is determined whether each first welding distance at which the CCS is highly concentrated is equal to a preset calibrated welding distance, and each first CCS corresponding to the equal first welding distance is welded to a corresponding battery cell pole.

[0011] Optionally, the step of comparing the coordinates of the center points of each battery cell pole with the coordinates of the center points of each corresponding CCS one by one to determine whether the welding conditions are met includes:

[0012] Compare the coordinates of the center points of each battery cell pole with the coordinates of the center points of the corresponding CCSs one by one to obtain multiple differences, and determine whether each difference is less than a preset difference threshold;

[0013] If so, it is determined that the first CCS whose difference value is less than the preset difference threshold value meets the welding condition.

[0014] Optionally, after the step of determining whether each first welding distance at which the CCS is highly concentrated is equal to a preset calibrated welding distance, the method for laser welding a battery pack pole and a CCS further includes:

[0015] For each first CCS corresponding to the unequal first welding distances, adjusting the first welding distance of the first CCS to be equal to the preset calibrated welding distance;

[0016] The adjusted first CCSs are compressed, and each compressed first CCS is welded to the corresponding battery cell pole.

[0017] Optionally, after the step of welding each compressed first CCS to the corresponding battery cell pole, the method of laser welding the battery pack pole and the integrated busbar further includes:

[0018] Measuring and obtaining the width of the welding ring on the welding surface of each first CCS after welding;

[0019] For each welded first CCS weld ring, determine whether the width of the weld ring is less than a preset threshold;

[0020] If no, welding is complete;

[0021] If yes, determine that the solder joint of the first CCS is a cold solder joint or a leaky solder joint, and output the center point coordinates of the first CCS and the first soldering distance to generate a rework coordinate set;

[0022] Each first CCS in the repair coordinate set is welded to the corresponding battery cell pole.

[0023] Optionally, after the step of welding each first CCS in the rework coordinate set to the corresponding battery cell pole, the method for laser welding the battery pack pole and the integrated busbar further comprises:

[0024] Return to the step of measuring the width of the welding ring on the welding surface of each first CCS after welding until the width of each welding ring is not less than a preset threshold.

[0025] In a second aspect, the present invention provides a device for laser welding a battery pack pole and an integrated busbar, the device being applied to a welding system, and the device comprising:

[0026] The first measurement module is used to measure the center point coordinates of each battery cell pole in the battery pack to be welded, and the center point coordinates of each CCS corresponding to each battery cell pole;

[0027] The first judgment module is used to compare the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met;

[0028] A pressing module, used for pressing each first CCS meeting the welding condition, measuring a first welding distance between a welding surface of each first CCS after pressing and a preset calibration focus position, and generating a CCS height set based on each first welding distance;

[0029] The first welding module is used to determine whether each first welding distance where the CCS is highly concentrated is equal to a preset calibrated welding distance, and weld each first CCS corresponding to the equal first welding distance to a corresponding battery cell pole.

[0030] Optionally, the first determination module is specifically configured to:

[0031] The center point coordinates of each battery cell pole are compared with the center point coordinates of the corresponding CCS one by one to obtain multiple differences, and it is determined whether each difference is less than a preset difference threshold. If so, it is determined that the first CCS with a difference less than the preset difference threshold meets the welding conditions.

[0032] Optionally, the device for laser welding the battery pack pole and the integrated busbar further includes:

[0033] An adjustment module, configured to, after determining whether each first welding distance in which the CCS is highly concentrated is equal to a preset calibrated welding distance, adjust, for each first CCS corresponding to the unequal first welding distances, the first welding distance of the first CCS to be equal to the preset calibrated welding distance;

[0034] A second welding module is used to press each adjusted first CCS and weld each pressed first CCS to a corresponding battery cell pole;

[0035] A second measuring module is used to measure the width of the welding ring on the welding surface of each first CCS after welding;

[0036] A second judgment module is used to judge whether the width of each welding ring of the first CCS after welding is less than a preset threshold, and if so, trigger the output module, and if not, the welding is completed;

[0037] The output module is used to determine whether the solder joint of the first CCS is a cold solder joint or a leaky solder joint, and output the center point coordinates of the first CCS and the first soldering distance to generate a rework coordinate set;

[0038] A third welding module, used for welding each first CCS in the rework coordinate set to a corresponding cell pole;

[0039] The trigger module is used to trigger the second measuring module until the width of each welding ring is not less than a preset threshold.

[0040] In a third aspect, the present invention provides a welding system for laser welding of a battery pack pole and an integrated busbar, the welding system comprising a programmable logic controller PLC, a photosensitive coupling assembly CCD visual detection system, a laser, a block pressing system and a height measurement system, the laser, the block pressing system, the height measurement system and the CCD visual detection system are all connected to the PLC in communication;

[0041] The PLC controls the CCD visual inspection system to measure the center point coordinates of each battery cell pole in the battery pack to be welded and the center point coordinates of the CCS corresponding to each battery cell pole;

[0042] The PLC compares the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met;

[0043] The PLC controls the pressing system to press each first CCS meeting the welding conditions, controls the height measuring system to measure the first welding distance between the welding surface of each first CCS after pressing and the preset calibration focus position of the laser, and generates a CCS height set based on each first welding distance;

[0044] The PLC determines whether each first welding distance at which the CCS is highly concentrated is equal to the preset calibrated welding distance, and controls the laser to weld each first CCS corresponding to the equal first welding distance with the corresponding battery cell pole.

[0045] Optionally, the welding system further comprises a robot connected to the PLC for communication, and the photosensitive coupling assembly CCD visual detection system, the laser, the pressing block system and the height measurement system are all fixedly mounted at the end of the robot;

[0046] For each first CCS corresponding to the unequal first welding distance, the PLC controls the robot to adjust the height of the laser until the first welding distance of the first CCS is equal to the preset calibrated welding distance;

[0047] The PLC controls the pressing system to press each adjusted first CCS, and controls the laser to weld each pressed first CCS with the corresponding battery cell pole;

[0048] The PLC controls the CCD visual inspection system to measure the width of the welding ring on the welding surface of each first CCS after welding, and for each welding ring of the first CCS after welding, determines whether the width of the welding ring is less than a preset threshold value, if not, the welding is completed, if yes, determines that the welding point of the first CCS is a cold joint or a leaking joint, and outputs the center point coordinates of the first CCS and the first welding distance to generate a rework coordinate set;

[0049] The PLC controls the laser to weld each first CCS in the repair coordinate set to the corresponding battery cell pole, and controls the CCD visual inspection system to measure the width of the welding ring on the welding surface of each first CCS after welding until the width of each welding ring is not less than a preset threshold.

[0050] Optionally, the PLC controls the robot to adjust the center of the laser's welding trajectory circle to the center point of each battery cell pole corresponding to each clamped first CCS, and controls the adjusted laser to weld each first CCS with the corresponding battery cell pole.

[0051] From the above content, it can be seen that the method for laser welding of battery pack poles and integrated busbars provided in an embodiment of the present invention can measure the center point coordinates of each battery cell pole in the battery pack to be welded, as well as the center point coordinates of each CCS corresponding to each battery cell pole; compare the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met; press each first CCS that meets the welding conditions, and measure the first welding distance between the welding surface of each first CCS after pressing and the preset calibrated focal position, and generate a CCS height set based on each first welding distance; determine whether each first welding distance in the CCS height set is equal to the preset calibrated welding distance, and weld each first CCS corresponding to the equal first welding distance to the corresponding battery cell pole. Therefore, by comparing the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one, the first CCS that meets the welding conditions is obtained, and then each first CCS corresponding to the equal first welding distance is welded to the corresponding battery cell pole, so that the battery cell pole and the CCS are aligned for welding through the welding system, and welding is performed automatically without manual labor, thereby improving welding efficiency.

[0052] The innovative features of the embodiments of the present invention include:

[0053] 1. The first CCS that meets the welding conditions is obtained by comparing the center point coordinates of each battery pole with the center point coordinates of the corresponding CCS one by one, and then each first CCS corresponding to the equal first welding distance is welded with the corresponding battery pole, so that the battery pole and the CCS are aligned for welding through the welding system, without manual labor, and the welding is performed automatically, thereby improving the welding efficiency.

[0054] 2. For each first CCS corresponding to the unequal first welding distance, after adjusting the first welding distance of the first CCS to be equal to the preset calibrated welding distance, each adjusted first CCS is re-tightened, and each tightened first CCS is welded to the corresponding battery cell pole. The first CCS whose welding distance does not meet the requirements can be automatically re-welded without manual work, thereby improving welding efficiency.

[0055] 3. The welding system measures the width of the welding ring on the welding surface of each first CCS after welding, and generates a repair coordinate set when it is judged that the width of the welding ring is less than the preset threshold, and then welds each first CCS in the repair coordinate set with the corresponding battery cell pole. Automatic repair after welding is achieved without manual operation, improving welding efficiency and ensuring welding quality.

[0056] 4. After rework, the width of the welding ring needs to be tested again. When false welding or leaking welding is detected, rework will continue until the welding is completed, that is, until the width of each welding ring is not less than the preset threshold. No manual operation is required, which improves welding efficiency and ensures welding quality.

[0057] 5. The device for laser welding of battery pack poles and integrated busbars provided by the present invention obtains a first CCS that meets welding conditions by comparing the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one, and then welds each first CCS corresponding to an equal first welding distance to the corresponding battery cell pole, thereby realizing alignment of the battery cell pole and the CCS for welding through the welding system, without manual labor, and automatically performing welding, thereby improving welding efficiency.

[0058] 6. The present invention provides a welding system for laser welding of battery pack poles and integrated busbars. The system compares the center point coordinates of each battery cell pole with the center point coordinates of each corresponding CCS through PLC to obtain a first CCS that meets the welding conditions, and then controls the laser to weld each first CCS corresponding to an equal first welding distance to the corresponding battery cell pole. The welding system is used to align the battery cell pole and the CCS for welding. The welding is performed automatically without manual labor, thereby improving welding efficiency.

[0059] Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

[0061] Figure 1 A schematic flow chart of a method for laser welding a battery pack pole and an integrated busbar provided in an embodiment of the present invention;

[0062] Figure 2 A device for laser welding of a battery pack pole and an integrated busbar provided in an embodiment of the present invention;

[0063] Figure 3 A schematic structural diagram of an angle of a welding system for laser welding of a battery pack pole and an integrated busbar provided in an embodiment of the present invention;

[0064] Figure 4 A schematic structural diagram of another angle of a welding system for laser welding of a battery pack pole and an integrated busbar provided in an embodiment of the present invention;

[0065] Figure 5 It is a schematic diagram of the structure of the battery pack to be welded;

[0066] Figure 6 Another schematic flow chart of a method for laser welding a battery pack pole and an integrated busbar provided in an embodiment of the present invention.

[0067] Figure 3-Figure 5 Among them, 1 CCD visual inspection system, 2 lasers, 3 pressing systems, 31 pressing blocks, 4 height measurement systems, 5 battery cell poles, and 6 robots. DETAILED DESCRIPTION

[0068] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0070] The embodiment of the present invention discloses a method, device and welding system for laser welding of a battery pack pole and an integrated busbar, which can improve welding efficiency. The embodiment of the present invention is described in detail below.

[0071] Figure 1 A schematic flow chart of a method for laser welding a battery pack pole and an integrated busbar provided in an embodiment of the present invention.

[0072] See also Figure 1 The method for laser welding of a battery pack pole and an integrated busbar provided by an embodiment of the present invention is applied to a welding system and specifically comprises the following steps:

[0073] S110: Measure and obtain the center point coordinates of each battery cell pole in the battery pack to be welded, and the center point coordinates of each CCS corresponding to each battery cell pole.

[0074] Before welding, the welding system can establish a plane coordinate system based on multiple reference points of the module end plate of the battery pack to be welded, wherein the reference points can be positioning holes on the module end plate. The specific method of establishing the plane coordinate system is any one of the plane coordinate system establishment methods in the prior art, and the embodiments of the present invention do not impose any limitation on this.

[0075] Then, in order to weld each cell pole to the corresponding CCS (Cells Contact System, integrated busbar), the welding system needs to measure the center point coordinates of each cell pole in the battery pack to be welded, as well as the center point coordinates of each CCS corresponding to each cell pole.

[0076] Wherein, step S110 may include:

[0077] After detecting that the battery pack to be welded is successfully placed in the welding station, measuring the coordinates of the center points of the poles of each battery cell in the battery pack to be welded;

[0078] After each integrated busbar CCS is installed in the battery pack to be welded and electrically connected to each battery cell, the coordinates of the center point of each CCS are measured.

[0079] Before welding, the battery pack to be welded needs to be placed on the welding station. After the welding system detects that the battery pack to be welded is successfully placed on the welding station, it measures the coordinates of the center points of each battery cell pole in the battery pack to be welded.

[0080] The measured center point coordinates of each battery pole in the battery pack to be welded can generate a battery pole center point coordinate set (X i , Y i ), where X i is the horizontal coordinate of the center point of the ith battery cell pole in the plane coordinate system, Y i is the horizontal coordinate of the center point of the ith battery cell pole in the plane coordinate system. The order of the battery cells in the battery pack to be welded can be preset, and the embodiment of the present invention does not impose any limitation on the ordering method.

[0081] Then, each integrated busbar CCS is manually installed in the battery pack to be welded, positioned by a jig, and electrically connected to each battery cell. After the installation is completed, the welding system measures the coordinates of the center point of each CCS.

[0082] Among them, the measured center point coordinates of each CCS can generate a CCS center point coordinate set (X k , Y k ), where X k is the horizontal coordinate of the kth CCS center point in the plane coordinate system, Y k is the horizontal coordinate of the center point of the kth CCS in the plane coordinate system. Wherein, each CCS corresponds to each battery cell one by one, and the order of each CCS can be preset and is the same as the order of the corresponding battery cells. The embodiment of the present invention does not impose any limitation on the ordering method.

[0083] S120: Compare the coordinates of the center points of each battery cell pole with the coordinates of the center points of the corresponding CCSs one by one to determine whether they meet the welding conditions;

[0084] Since the battery pole and the CCS are welded during welding, after obtaining the battery pole center point coordinate set and the CCS center point coordinate set, it is necessary to determine whether the welding conditions are met. That is, the center point coordinates of each battery pole are compared with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met.

[0085] Wherein, step S120 may include:

[0086] Compare the coordinates of the center points of each battery cell pole with the coordinates of the center points of the corresponding CCSs one by one to obtain multiple differences, and determine whether each difference is less than a preset difference threshold;

[0087] If so, it is determined that the first CCS whose difference value is less than the preset difference threshold value meets the welding condition.

[0088] Specifically, for each cell pole in the cell pole center point coordinate set, the vector length, that is, the difference between the center point coordinate of the cell pole and the center point coordinate of the corresponding CCS is calculated to determine whether the vector length is less than a preset difference threshold.

[0089] If the vector length is less than the preset difference threshold, it means that the center point of the battery cell pole is close to the center point of the corresponding CCS, which is suitable for welding. That is, the first CCS with a difference less than the preset difference threshold meets the welding conditions. Otherwise, it is not suitable for welding, and the CCS needs to be discharged and then readjusted.

[0090] S130: Compact each first CCS meeting the welding condition, measure a first welding distance between a welding surface of each first CCS after compaction and a preset calibration focus position, and generate a CCS height set based on each first welding distance.

[0091] During welding, it is also necessary to ensure that the first welding distance between the welding surface of each first CCS and the preset calibrated focal position of the laser in the welding system is the preset calibrated welding distance in order to successfully perform welding. The preset calibrated focal position is a position that can be successfully used for welding after the focal position of the laser in the welding system is calibrated before welding. Specifically, the laser is a device for welding. The preset calibrated welding distance is a distance that can be successfully welded after the welding distance between the welding surface of the CCS and the preset calibrated focal position of the laser is calibrated before welding.

[0092] Therefore, for each first CCS that meets the welding conditions, the welding system presses the first CCS and measures a first welding distance between the welding surface of the first CCS and a preset calibration focus position.

[0093] Specifically, before the welding system presses the first CCS, the center position of the pressing block in the pressing block system included in the welding system needs to be adjusted to the calibrated center position corresponding to the center point coordinates of the battery cell pole corresponding to the first CCS, so as to ensure that the pressing block system presses the first CCS.

[0094] Among them, since only when the center position of the pressing block in the pressing block system corresponds one-to-one with the center point of the battery cell pole, the CCS corresponding to the battery cell pole can be compressed. Therefore, before welding, the welding system calibrates the center position of the pressing block in the pressing block system based on the pre-set center point coordinates of each battery cell pole to obtain the calibrated center positions corresponding to the center point coordinates of each battery cell pole.

[0095] Then generate a CCS height set Z based on each first welding distance i, where Zi is the first welding distance of the i-th CCS, that is, the CCS height concentration includes the first welding distance of each first CCS. Since CCS corresponds to the battery cell one by one, the first welding distance of each first CCS is also the first welding distance of the corresponding battery cell. At this time, for the battery cell, there is a coordinate set (X i , Y i , Z i ), and it only contains the coordinates of the center point of the battery cell pole corresponding to the first CCS that meets the welding conditions.

[0096] S140: Determine whether each first welding distance where the CCS is highly concentrated is equal to a preset calibrated welding distance, and weld each first CCS corresponding to the equal first welding distance to the corresponding battery cell pole.

[0097] The welding system determines whether the first welding distances of the CCS height concentration are equal to the preset calibrated welding distances. If they are equal, it means that welding can be performed directly. Therefore, for each first CCS corresponding to the equal first welding distance, the laser in the welding system welds each first CCS to the corresponding battery cell pole. Specifically, the laser is welded according to the coordinate set (X i , Y i , Z i )Weld each position to be welded.

[0098] Among them, welding each first CCS corresponding to an equal first welding distance with the corresponding battery cell pole can be performed by: adjusting the center of the laser's welding trajectory circle to the center point of each battery cell pole corresponding to each first CCS, ensuring that the welding is centered on the center point of the battery cell pole, and then controlling the adjusted laser to weld each first CCS with the corresponding battery cell pole.

[0099] From the above content, it can be seen that a method for laser welding of battery pack poles and integrated busbars provided in an embodiment of the present invention is applied to a welding system, and the method includes: measuring the center point coordinates of each battery cell pole in the battery pack to be welded, and the center point coordinates of each CCS corresponding to each battery cell pole; comparing the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met; pressing each first CCS that meets the welding conditions, and measuring the first welding distance between the welding surface of each first CCS after pressing and a preset calibrated focal position, and generating a CCS height set based on each first welding distance; determining whether each first welding distance in the CCS height set is equal to the preset calibrated welding distance, and welding each first CCS corresponding to the equal first welding distance to the corresponding battery cell pole. Therefore, by comparing the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one, the first CCS that meets the welding conditions is obtained, and then each first CCS corresponding to the equal first welding distance is welded to the corresponding battery cell pole, so that the battery cell pole and the CCS are aligned for welding through the welding system, and welding is performed automatically without manual labor, thereby improving welding efficiency.

[0100] After determining in step 140 whether each first welding distance at which the CCS is highly concentrated is equal to the preset calibrated welding distance, a method for laser welding of a battery pack pole and an integrated busbar provided by an embodiment of the present invention may further include:

[0101] For each first CCS corresponding to the unequal first welding distances, adjusting the first welding distance of the first CCS to be equal to the preset calibrated welding distance;

[0102] The adjusted first CCSs are compressed, and each compressed first CCS is welded to the corresponding battery cell pole.

[0103] For each first CCS corresponding to the unequal first welding distance, it means that welding cannot be performed directly and the first welding distance of the first CCS needs to be adjusted. Therefore, the welding system adjusts the first welding distance of the first CCS to be equal to the preset calibrated welding distance.

[0104] Since the first welding distance is readjusted, each adjusted first CCS needs to be pressed again, and then the laser in the welding system welds each pressed first CCS to the corresponding battery cell pole. The specific pressing and welding methods are described above and will not be repeated here.

[0105] Therefore, for each first CCS corresponding to the unequal first welding distance, after adjusting the first welding distance of the first CCS to be equal to the preset calibrated welding distance, each adjusted first CCS is re-tightened, and each tightened first CCS is welded to the corresponding battery cell pole. Without manual work, the re-welding of the first CCS whose welding distance does not meet the requirements can be automatically completed, thereby improving the welding efficiency.

[0106] After welding each compressed first CCS to the corresponding battery cell pole, a method for laser welding a battery pack pole and an integrated busbar provided by an embodiment of the present invention may further include:

[0107] Measuring and obtaining the width of the welding ring on the welding surface of each first CCS after welding;

[0108] For each welded first CCS weld ring, determine whether the width of the weld ring is less than a preset threshold;

[0109] If no, welding is complete;

[0110] If yes, determine that the solder joint of the first CCS is a cold solder joint or a leaky solder joint, and output the center point coordinates of the first CCS and the first soldering distance to generate a rework coordinate set;

[0111] Each first CCS in the repair coordinate set is welded to the corresponding battery cell pole.

[0112] Since cold joints or leaking joints may occur during the welding process, which may lead to welding failure, an inspection is required after the welding is completed. Specifically, the welding system measures the width of the weld ring on the welding surface of the first CCS after each welding. The first CCS after welding here refers to all the first CCS after welding, including the first CCS corresponding to the previously equal first welding distances and the first CCS corresponding to the unequal first welding distances adjusted to equal distances.

[0113] Then, for each welded first CCS weld ring, it is determined whether the width of the weld ring is less than a preset threshold. If not, it indicates that the welding is successful and the welding is completed.

[0114] If so, it means that the welding is unsuccessful, and the solder joint of the first CCS is determined to be a cold solder joint or a leaky solder joint. The center point coordinates of the first CCS and the first welding distance are output to generate a rework coordinate set, and then the laser welds each first CCS in the rework coordinate set with the corresponding battery cell pole.

[0115] Thus, the welding system measures the width of the welding ring on the welding surface of each first CCS after welding, generates a rework coordinate set when it is determined that the width of the welding ring is less than a preset threshold, and then welds each first CCS in the rework coordinate set with the corresponding battery cell pole. Automatic rework after welding is achieved without manual operation, improving welding efficiency and ensuring welding quality.

[0116] After welding each first CCS in the rework coordinate set to the corresponding battery cell pole, the method for laser welding of the battery pack pole and the integrated busbar provided by the embodiment of the present invention may further include:

[0117] Return to the step of measuring the width of the welding ring on the welding surface of each first CCS after welding, until the width of each welding ring is not less than a preset threshold.

[0118] Since welding failure may still occur after rework, the width of the welding ring needs to be tested again after rework. When cold welding or leaking welding is detected, rework is continued until welding is completed without manual operation, thereby improving welding efficiency and ensuring welding quality.

[0119] Figure 2 A schematic diagram of a structure of a device for laser welding a battery pack pole and an integrated busbar provided by an embodiment of the present invention, see Figure 2 , an embodiment of the present invention provides a device for laser welding a battery pack pole and an integrated busbar, the device is applied to a welding system, and the device includes:

[0120] The first measurement module 201 is used to measure the center point coordinates of each battery cell pole in the battery pack to be welded, and the center point coordinates of each CCS corresponding to each battery cell pole;

[0121] The first judgment module 202 is used to compare the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met;

[0122] A pressing module 203 is used to press each first CCS that meets the welding conditions, measure the first welding distance between the welding surface of each first CCS after pressing and a preset calibration focus position, and generate a CCS height set based on each first welding distance;

[0123] The first welding module 204 is used to determine whether each first welding distance where the CCS is highly concentrated is equal to a preset calibrated welding distance, and weld each first CCS corresponding to the equal first welding distance to the corresponding battery cell pole.

[0124] Therefore, an apparatus for laser welding of battery pack poles and integrated busbars provided in an embodiment of the present invention is applied to a welding system, and the apparatus can measure the center point coordinates of each battery cell pole in the battery pack to be welded, as well as the center point coordinates of each CCS corresponding to each battery cell pole; compare the center point coordinates of each battery cell pole with the center point coordinates of each corresponding CCS one by one to determine whether the welding conditions are met; press each first CCS that meets the welding conditions, and measure the first welding distance between the welding surface of each first CCS after pressing and a preset calibrated focal position, and generate a CCS height set based on each first welding distance; determine whether each first welding distance in the CCS height set is equal to the preset calibrated welding distance, and weld each first CCS corresponding to the equal first welding distance to the corresponding battery cell pole. Therefore, by comparing the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one, the first CCS that meets the welding conditions is obtained, and then each first CCS corresponding to the equal first welding distance is welded to the corresponding battery cell pole, so that the battery cell pole and the CCS are aligned for welding through the welding system, and welding is performed automatically without manual labor, thereby improving welding efficiency.

[0125] In one implementation, the first determining module 202 may be specifically configured to:

[0126] The center point coordinates of each battery cell pole are compared with the center point coordinates of the corresponding CCS one by one to obtain multiple differences, and it is determined whether each difference is less than a preset difference threshold. If so, it is determined that the first CCS with a difference less than the preset difference threshold meets the welding conditions.

[0127] Optionally, the device for laser welding the battery pack pole and the integrated busbar further includes:

[0128] An adjustment module, configured to, after determining whether each first welding distance in which the CCS is highly concentrated is equal to a preset calibrated welding distance, adjust, for each first CCS corresponding to the unequal first welding distances, the first welding distance of the first CCS to be equal to the preset calibrated welding distance;

[0129] A second welding module is used to press each adjusted first CCS and weld each pressed first CCS to a corresponding battery cell pole;

[0130] A second measuring module is used to measure the width of the welding ring on the welding surface of each first CCS after welding;

[0131] A second judgment module is used to judge whether the width of each welding ring of the first CCS after welding is less than a preset threshold, and if so, trigger the output module, and if not, the welding is completed;

[0132] The output module is used to determine whether the solder joint of the first CCS is a cold solder joint or a leaky solder joint, and output the center point coordinates of the first CCS and the first soldering distance to generate a rework coordinate set;

[0133] A third welding module, used for welding each first CCS in the rework coordinate set to a corresponding cell pole;

[0134] The trigger module is used to trigger the second measuring module until the width of each welding ring is not less than a preset threshold.

[0135] The above device embodiment corresponds to the method embodiment and has the same technical effect as the method embodiment. For specific description, please refer to the method embodiment. The device embodiment is obtained based on the method embodiment. For specific description, please refer to the method embodiment part, which will not be repeated here.

[0136] Figure 3 A schematic structural diagram of an angle of a welding system for laser welding of a battery pack pole and an integrated busbar provided in an embodiment of the present invention, Figure 4 A schematic structural diagram of another angle of a welding system for laser welding of a battery pack pole and an integrated busbar provided in an embodiment of the present invention, Figure 5 It is a schematic diagram of the structure of the battery pack to be welded.

[0137] See also Figure 3-Figure 5 The welding system for laser welding of battery pack poles and integrated busbars provided in an embodiment of the present invention includes a PLC (Programmable Logic Controller), a CCD (Charge-coupled Device) visual inspection system 1, a laser 2, a block pressing system 3 and a height measuring system 4. The laser 2, the block pressing system 3, the height measuring system 4 and the CCD visual inspection system 1 are all connected to the PLC for communication.

[0138] The PLC controls the CCD visual inspection system 1 to measure the center point coordinates of each battery cell pole 5 in the battery pack to be welded and the center point coordinates of the CCS corresponding to each battery cell pole;

[0139] The PLC compares the center coordinates of each battery cell pole 5 with the center coordinates of the corresponding CCS one by one to determine whether the welding conditions are met;

[0140] The PLC controls the pressing system 3 to press each first CCS that meets the welding conditions, controls the height measuring system 4 to measure the first welding distance between the welding surface of each first CCS after pressing and the preset calibration focus position of the laser 2, and generates a CCS height set based on each first welding distance;

[0141] The PLC determines whether each first welding distance at which the CCS is highly concentrated is equal to the preset calibrated welding distance, and controls the laser 2 to weld each first CCS corresponding to the equal first welding distance with the corresponding battery cell pole 5 .

[0142] Among them, the CCD visual inspection system 1 is used to measure the center point coordinates of the battery cell pole 5 and the center point coordinates of the CCS;

[0143] The laser 2 is used to weld the CCS and the battery cell pole 5;

[0144] The briquetting system 3 is used to compact the CCS;

[0145] The height measuring system 4 is used to measure the welding distance between the welding surface of the CCS and the preset calibration focus position of the laser 2, mainly through a height sensor.

[0146] The PLC is used to control the CCD visual inspection system 1, the laser 2, the pressing system 3 and the height measurement system 4.

[0147] Before welding, the battery pack to be welded needs to be placed on the welding station. After the PLC detects that the battery pack to be welded is successfully placed on the welding station, it sends a first measurement instruction to the CCD visual inspection system 1 to inform it to perform pole addressing.

[0148] The CCD visual inspection system 1 receives the first measurement instruction, measures the center point coordinates of each battery cell pole in the battery pack to be welded, and sends them to the PLC.

[0149] The PLC receives the center point coordinates of each battery pole in the battery pack to be welded measured by the CCD visual inspection system 1, and generates a battery pole center point coordinate set (X i , Y i ), where X i is the horizontal coordinate of the center point of the ith battery cell pole in the plane coordinate system, Y i is the horizontal coordinate of the center point of the ith battery cell pole in the plane coordinate system. The order of the battery cells in the battery pack to be welded can be preset, and the embodiment of the present invention does not impose any limitation on the ordering method.

[0150] Then, each integrated busbar CCS is manually installed in the battery pack to be welded, positioned by a jig, and electrically connected to each battery cell. After the installation is completed, the PLC sends a second measurement instruction to the CCD visual inspection system 1 to inform it to perform CCS addressing.

[0151] The CCD visual inspection system 1 receives the second measurement instruction, measures the center point coordinates of each CCS and sends them to the PLC.

[0152] The PLC receives the center point coordinates of each CCS measured by the CCD visual inspection system 1 and generates a CCS center point coordinate set (X k , Y k ), where X k is the horizontal coordinate of the kth CCS center point in the plane coordinate system, Y k is the horizontal coordinate of the center point of the kth CCS in the plane coordinate system. Wherein, each CCS corresponds to each battery cell one by one, and the order of each CCS can be preset and is the same as the order of the corresponding battery cells. The embodiment of the present invention does not impose any limitation on the ordering method.

[0153] Since the battery pole and the CCS are welded during welding, after obtaining the battery pole center point coordinate set and the CCS center point coordinate set, it is necessary to determine whether the welding conditions are met. That is, the center point coordinates of each battery pole in the battery pole center point coordinate set and the center point coordinates of each corresponding CCS in the CCS center point coordinate set are compared one by one to determine whether the welding conditions are met. The specific method of determining whether the welding conditions are met can be found in the description of step S120 above, which will not be repeated here.

[0154] Since welding is performed by laser 2, it is also necessary to ensure that each welding distance is a preset calibrated welding distance in order to successfully perform welding. The preset calibrated welding distance is the distance that can be successfully welded after calibrating the welding distance between the welding surface of each CCS and the preset calibrated focal position of the laser 2 before welding. The preset calibrated focal position is the position that can be successfully used for welding after calibrating the focal position of the laser 2 in the welding system before welding.

[0155] Therefore, for each first CCS that meets the welding conditions, the PLC controls each pressing block 31 in the pressing block system 3 to press the first CCS, and sends a third measurement instruction to the height measuring system 4 to measure the welding distance, wherein the pressing block system 3 includes one or more pressing blocks 31, and exemplarily, the number of pressing blocks 31 is 2.

[0156] The height measurement system 4 receives the third measurement instruction, measures the first welding distance between the welding surface of the first CCS and the preset calibration focus position of the laser 2, and sends it to the PLC.

[0157] The PLC receives the first welding distances and generates a CCS height set Z based on each first welding distance. i , where Zi is the first welding distance of the i-th CCS, that is, the CCS height concentration includes the first welding distance of each first CCS. Since CCS corresponds to the battery cell one by one, the first welding distance of each first CCS is also the first welding distance of the corresponding battery cell. At this time, for the battery cell, there is a coordinate set (Xi , Y i , Z i ), and it only contains the coordinates of the center point of the battery cell pole corresponding to the first CCS that meets the welding conditions.

[0158] Then the PLC determines whether the first welding distances of the CCS height concentration are equal to the preset calibrated welding distances. If they are equal, it means that welding can be performed directly. Therefore, for each first CCS corresponding to the equal first welding distance, the PLC controls the laser 2 to weld each first CCS with the corresponding battery cell pole. Specifically, the laser is set according to the coordinate set (X i , Y i , Z i )Weld each position to be welded.

[0159] From the above content, it can be seen that an embodiment of the present invention provides a welding system for laser welding of battery pack poles and CCS, which includes a programmable logic controller PLC, a photosensitive coupling component CCD visual detection system 1, a laser 2, a briquetting system 3 and a height measurement system 4. The laser 2, the briquetting system 3, the height measurement system 4 and the CCD visual detection system 1 are all connected to the PLC for communication. The PLC controls the CCD visual inspection system to measure the center point coordinates of each battery cell pole in the battery pack to be welded and the center point coordinates of the CCS corresponding to each battery cell pole; the PLC compares the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met; the PLC controls each pressing block in the pressing block system to press each first CCS that meets the welding conditions, controls the height measurement system to measure the first welding distance between the welding surface of each first CCS after pressing and the preset calibrated focal position of the laser, and generates a CCS height set based on each first welding distance; the PLC determines whether each first welding distance in the CCS height set is equal to the preset calibrated welding distance, and controls the laser to weld each first CCS corresponding to the equal first welding distance to the corresponding battery cell pole. Therefore, the welding system compares the center point coordinates of each battery pole with the center point coordinates of the corresponding CCS through PLC one by one to obtain the first CCS that meets the welding conditions, and then controls the laser to weld each first CCS corresponding to the equal first welding distance with the corresponding battery pole, so as to realize the alignment of the battery pole and CCS for welding through the welding system, without manual work, and automatically perform welding, thereby improving welding efficiency.

[0160] Continue to see Figure 3-Figure 5 , the welding system also includes a robot 6 connected to the PLC communication, a photosensitive coupling component CCD visual detection system 1, a laser 2, a block pressing system 3 and a height measuring system 4 are all fixedly installed at the end of the robot 6;

[0161] For each first CCS corresponding to the unequal first welding distance, the PLC controls the robot 6 to adjust the height of the laser 2 until the first welding distance of the first CCS is equal to the preset calibrated welding distance;

[0162] The PLC controls the pressing system 3 to press each adjusted first CCS, and controls the laser 2 to weld each pressed first CCS with the corresponding battery cell pole 5;

[0163] The PLC controls the CCD visual inspection system 1 to measure the width of the welding ring on the welding surface of each first CCS after welding. For each welding ring of the first CCS after welding, it is determined whether the width of the welding ring is less than a preset threshold. If not, the welding is completed. If yes, it is determined that the welding point of the first CCS is a cold joint or a leaking joint, and the center point coordinates of the first CCS and the first welding distance are output to generate a rework coordinate set;

[0164] The PLC controls the laser 2 to weld each first CCS in the repair coordinate set with the corresponding battery cell pole, and controls the CCD visual inspection system 1 to measure the width of the welding ring on the welding surface of each first CCS after welding until the width of each welding ring is not less than a preset threshold.

[0165] The CCD visual inspection system 1, the laser 2, the pressing system 3 and the height measurement system 4 are all fixedly installed at the end of the robot 6. For example, the end may be the end of the robot arm of the robot 6. The fixed connection method may be:

[0166] The welding system also includes a bracket, and the photosensitive coupling component CCD visual detection system 1, the laser 2, the block system 3 and the height measurement system 4 are all fixedly installed on the bracket, and the bracket is fixedly installed on the end of the robot 6.

[0167] For each first CCS corresponding to an unequal first welding distance, it means that welding cannot be performed directly and the first welding distance of the first CCS needs to be adjusted. Therefore, the PLC controls the robot 6 to adjust the height of the laser 2 until the first welding distance of the first CCS is equal to the preset calibrated welding distance.

[0168] The way in which the PLC controls the robot 6 to adjust the height of the laser 2 is an existing way of height adjustment, and the embodiment of the present invention does not impose any limitation on this.

[0169] For example: Assuming that the preset calibrated welding distance is 536 mm, the focus position is set to 0 at this time, wherein, when the first welding distance is equal to the preset calibrated welding distance, the focus position is 0;

[0170] Assuming that the first welding distance is 539mm, it can be seen that the focal position is not 0 at this time, and the first welding distance is not equal to the preset calibrated welding distance. The PLC controls the robot 6 to adjust the height of the laser 2 so that the focal position is 0, that is, the first welding distance is adjusted to 536mm, which is equal to the preset calibrated welding distance.

[0171] Since the first welding distance is readjusted, the PLC needs to control the pressing blocks 31 in the pressing block system 3 again to press each adjusted first CCS, and then control the laser 2 to weld each pressed first CCS with the corresponding battery cell pole 5 .

[0172] Therefore, for each first CCS corresponding to the unequal first welding distance, the PLC controls the robot 6 to adjust the first welding distance of the first CCS to be equal to the preset calibrated welding distance, and then re-controls each pressing block 31 in the pressing block system 3 to press each adjusted first CCS, and controls the laser 2 to weld each pressed first CCS with the corresponding battery cell pole. Without manual work, the welding system itself can automatically complete the re-welding of the first CCS whose welding distance does not meet the requirements, thereby improving the welding efficiency of the welding system.

[0173] Continue to see Figure 3-Figure 5 The PLC controls the robot 6 to adjust the center of the welding trajectory circle of the laser 2 to the center point of each battery cell pole 5 corresponding to each first CCS, and controls the adjusted laser 2 to weld each first CCS with the corresponding battery cell pole 5.

[0174] Before welding, the CCD visual inspection system 1 establishes a plane coordinate system based on multiple reference points of the module end plate of the battery pack to be welded, wherein the reference points can be positioning holes on the module end plate. The specific method of establishing the plane coordinate system is any one of the plane coordinate system establishment methods in the prior art, and the embodiment of the present invention does not impose any limitation on this.

[0175] During welding, each first CCS is pressed in turn by the pressing block system 3, and then the robot 6 adjusts the welding distance from the focal position of the laser 2 to the welding surface of each first CCS, so that the pressed first CCS and the battery cell pole can be welded, wherein the pressing block system 3 includes one or more pressing blocks 31, and exemplarily, the number of pressing blocks 31 is 2.

[0176] Specifically, the center position of the pressing block 31 in the pressing block system 3 needs to correspond one-to-one with the center point of the battery cell pole so that the first CCS corresponding to the battery cell pole can be compressed, and the welding distance needs to be suitable for successful welding. Therefore, before welding, the center position of the pressing block 31 and the welding distance need to be calibrated.

[0177] Among them, the focus position is an important process parameter of laser welding, which directly affects the width and depth of the weld. Generally speaking, the focus position should be set below the workpiece surface at about 1 / 4 of the required penetration depth, so that a better penetration effect can be obtained. If the focus position is too high or too low, it will lead to reduced penetration or weld penetration.

[0178] Specifically, the PLC-controlled robot 6 calibrates the center position of the pressing block 31 in the pressing block system 3 based on the pre-set center point coordinates of each battery cell pole 5 to obtain the calibrated center positions corresponding to the center point coordinates of each battery cell pole 5, and calibrates the welding distance to obtain the calibrated welding distance. The calibration method is any calibration method in the prior art, and the embodiment of the present invention does not make any limitation to this.

[0179] For each first CCS, in order to ensure successful welding, before welding, the PLC also needs to adjust the center position of the pressing block 31 in the pressing block system 3 to the calibrated center position corresponding to the coordinates of the center point of the battery cell pole corresponding to the first CCS, so as to ensure that the pressing block system 3 presses the first CCS tightly, and then the PLC controls the robot 6 to adjust the center of the welding trajectory circle of the laser 2 to the center point of the battery cell pole 5 corresponding to the pressed first CCS, to ensure that the welding is centered on the center point of the battery cell pole 5.

[0180] Finally, the PLC controls the adjusted laser 2 to weld the first CCS with the corresponding battery cell pole 5. That is to say, during welding, the laser 2 is adjusted according to the coordinate set (X i , Y i , Z i ) for welding each.

[0181] Specific content introduction and Figure 1 The provided method for laser welding of the battery pack pole and the integrated busbar is the same, for details, please refer to steps S110-S140, which will not be repeated here.

[0182] After the laser 2 welds each first CCS after compaction to the corresponding battery cell pole, the PLC controls the CCD visual inspection system 1 to measure the width of the welding ring on the welding surface of each first CCS after welding, and for each welding ring of the first CCS after welding, determines whether the width of the welding ring is less than a preset threshold value, if not, the welding is completed, if yes, determines that the welding point of the first CCS is a cold joint or a leaking joint, and outputs the center point coordinates of the first CCS and the first welding distance to generate a rework coordinate set;

[0183] The PLC controls the laser 2 to weld each first CCS in the repair coordinate set with the corresponding battery cell pole.

[0184] Since cold joints or leaking joints may occur during the welding process, which may lead to welding failure, inspection is required after welding is completed. Specifically, the width of the welding ring on the welding surface of each first CCS after welding is measured by the CCD visual inspection system 1. Here, the first CCS after welding includes both the first CCS corresponding to the previously equal first welding distance and the first CCS corresponding to the unequal first welding distance adjusted to an equal distance.

[0185] Then, for each welded first CCS weld ring, it is determined whether the width of the weld ring is less than a preset threshold. If not, it indicates that the welding is successful and the welding is completed.

[0186] If yes, it means that the welding is unsuccessful, and the solder joint of the first CCS is determined to be a cold solder joint or a leaky solder joint. The center point coordinates of the first CCS and the first welding distance are output to generate a rework coordinate set, and then the laser 2 welds each first CCS in the rework coordinate set with the corresponding battery cell pole.

[0187] Therefore, the PLC controls the CCD visual inspection system 1 to measure the width of the welding ring on the welding surface of each first CCS after welding, and generates a rework coordinate set when it is judged that the width of the welding ring is less than the preset threshold, and then controls the laser 2 to weld each first CCS in the rework coordinate set with the corresponding battery cell pole. Automatic rework after welding is achieved without manual operation, improving the welding efficiency of the welding system and ensuring welding quality.

[0188] After the laser 2 welds each first CCS in the repair coordinate set to the corresponding battery cell pole, the PLC controls the CCD visual inspection system 1 to measure the width of the welding ring on the welding surface of each first CCS after welding until the width of each welding ring is not less than a preset threshold.

[0189] Since welding failure may still occur after rework, the width of the welding ring needs to be detected again after rework. When false welding or leaking welding is detected, rework is continued until welding is completed, that is, until the width of each welding ring is not less than the preset threshold value. No manual operation is required, thereby improving the welding efficiency of the welding system and ensuring the welding quality.

[0190] The system embodiment and Figure 1 The method embodiments shown are embodiments based on the same inventive concept, and the relevant parts can be referenced to each other. The above system embodiments correspond to the method embodiments, and have the same technical effects as the method embodiments. For specific descriptions, refer to the method embodiments.

[0191] For ease of understanding, a specific embodiment is first used to introduce. Figure 6 Another schematic flow chart of the method for laser welding of battery pack poles and integrated busbars provided in an embodiment of the present invention. Figure 6 :

[0192] 1. Preparation before welding: CCD visual inspection system 1 establishes a plane coordinate system and performs calibration.

[0193] The CCD visual inspection system 1 establishes a plane coordinate system based on multiple reference points of the module end plate of the battery pack to be welded. The PLC controls the robot 6 to calibrate the center position of the pressing block 31 in the pressing block system 3 to obtain the calibrated center positions corresponding to the center point coordinates of each battery cell pole 5, and calibrates the welding distance to obtain the preset calibrated welding distance.

[0194] 2. Pole addressing: PLC controls the CCD visual inspection system 1 to measure the center point coordinates of each battery cell pole 5 in the battery pack to be welded, and generates a set of battery cell pole center point coordinates.

[0195] Please refer to the relevant description of the welding system for details, which will not be repeated here.

[0196] 3.CCS is assembled and positioned using a jig.

[0197] That is, each integrated busbar CCS is manually installed in the battery pack to be welded, positioned by a jig, and electrically connected to each battery cell.

[0198] 4. CCS addressing: PLC controls the CCD visual inspection system 1 to measure the center point coordinates of each CCS and generate a CCS center point coordinate set.

[0199] Please refer to the relevant description of the welding system for details, which will not be repeated here.

[0200] 5. Compare the center point coordinates of each cell pole in the cell pole center point coordinate set with the center point coordinates of each CCS in the CCS center point coordinate set to determine whether they meet the welding conditions. If not, remove the CCS and then readjust the CCS.

[0201] See Figure 1 Step S120 is not described in detail here.

[0202] 6. For each first CCS that meets the welding conditions, the height measurement system measures the first welding distance between the welding surface of the first CCS and the preset calibration focus position of the laser, and generates a CCS height set based on each first welding distance.

[0203] See Figure 1 Step S130 is not described again here.

[0204] 7. PLC adjusts the distance from the compensation laser 2 to the welding surface, adjusts it to the focus position of 0, and adjusts the center of the welding trajectory circle of the laser 2 and the center position of each pressing block 31 in the pressing block system 3. After the adjustment is completed, laser welding is performed.

[0205] Please refer to the relevant description of the welding system for details, which will not be repeated here.

[0206] 8. Post-weld inspection: Determine whether the width of the weld ring after welding is less than the preset threshold. If yes, welding is completed. If not, go to step 9.

[0207] 9. Record the coordinates of the cold solder joints or leaky solder joints, generate a rework coordinate set, and the robot 6 drives the laser 2 to move to each position in the rework coordinate set for rework.

[0208] 10. Perform solder joint inspection after rework to determine whether the width of the reworked solder ring is less than a preset threshold. If so, welding is completed. If not, return to step 9 until welding is completed, that is, until the width of each solder ring is not less than the preset threshold.

[0209] For details of steps 8, 9 and 10, please refer to the corresponding contents after the welding is completed in step S140 in the above method embodiment, and will not be repeated here.

[0210] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0211] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for laser welding of a battery pack pole and an integrated busbar, characterized in that: The method is applied to a welding system, and the method comprises: Measure and obtain the center point coordinates of each battery cell pole in the battery pack to be welded, as well as the center point coordinates of each CCS corresponding to each battery cell pole; Compare the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether they meet the welding conditions; Compacting each first CCS meeting the welding condition, measuring a first welding distance between a welding surface of each first CCS after compaction and a preset calibration focus position, and generating a CCS height set based on each first welding distance; It is determined whether each first welding distance at which the CCS is highly concentrated is equal to a preset calibrated welding distance, and each first CCS corresponding to the equal first welding distance is welded to a corresponding battery cell pole.

2. The method according to claim 1, characterized in that The step of comparing the coordinates of the center points of each battery cell pole with the coordinates of the center points of each corresponding CCS one by one to determine whether the welding conditions are met includes: Compare the coordinates of the center points of each battery cell pole with the coordinates of the center points of the corresponding CCSs one by one to obtain multiple differences, and determine whether each difference is less than a preset difference threshold; If so, it is determined that the first CCS whose difference value is less than the preset difference threshold value meets the welding condition.

3. The method according to claim 1, characterized in that After the step of determining whether each first welding distance in the CCS height concentration is equal to a preset calibrated welding distance, the method further includes: For each first CCS corresponding to the unequal first welding distances, adjusting the first welding distance of the first CCS to be equal to the preset calibrated welding distance; The adjusted first CCSs are compressed, and each compressed first CCS is welded to the corresponding battery cell pole.

4. The method according to claim 3, characterized in that After the step of welding each compressed first CCS to the corresponding battery cell pole, the method further includes: Measuring and obtaining the width of the welding ring on the welding surface of each first CCS after welding; For each welded first CCS weld ring, determine whether the width of the weld ring is less than a preset threshold; If no, welding is complete; If yes, determine that the solder joint of the first CCS is a cold solder joint or a leaky solder joint, and output the center point coordinates of the first CCS and the first soldering distance to generate a rework coordinate set; Each first CCS in the repair coordinate set is welded to the corresponding battery cell pole.

5. The method according to claim 4, characterized in that After the step of welding each first CCS in the rework coordinate set to a corresponding cell pole, the method further includes: Return to the step of measuring the width of the welding ring on the welding surface of each first CCS after welding until the width of each welding ring is not less than a preset threshold.

6. A device for laser welding of battery pack poles and integrated busbars, characterized in that: The device is applied to a welding system, and comprises: The first measurement module is used to measure the center point coordinates of each battery cell pole in the battery pack to be welded, and the center point coordinates of each CCS corresponding to each battery cell pole; The first judgment module is used to compare the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met; A pressing module, used for pressing each first CCS meeting the welding condition, measuring a first welding distance between a welding surface of each first CCS after pressing and a preset calibration focus position, and generating a CCS height set based on each first welding distance; The first welding module is used to determine whether each first welding distance where the CCS is highly concentrated is equal to a preset calibrated welding distance, and weld each first CCS corresponding to the equal first welding distance to a corresponding battery cell pole.

7. The device according to claim 6, characterized in that The device also includes: An adjustment module, configured to, after determining whether each first welding distance in which the CCS is highly concentrated is equal to a preset calibrated welding distance, adjust, for each first CCS corresponding to the unequal first welding distances, the first welding distance of the first CCS to be equal to the preset calibrated welding distance; A second welding module is used to press each adjusted first CCS and weld each pressed first CCS to a corresponding battery cell pole; A second measuring module is used to measure the width of the welding ring on the welding surface of each first CCS after welding; A second judgment module is used to judge whether the width of each welding ring of the first CCS after welding is less than a preset threshold, and if so, trigger the output module, and if not, the welding is completed; The output module is used to determine whether the solder joint of the first CCS is a cold solder joint or a leaky solder joint, and output the center point coordinates of the first CCS and the first soldering distance to generate a rework coordinate set; A third welding module, used for welding each first CCS in the rework coordinate set to a corresponding cell pole; The trigger module is used to trigger the second measuring module until the width of each welding ring is not less than a preset threshold.

8. A welding system for laser welding of battery pack poles and integrated busbars, characterized in that: The welding system includes a programmable logic controller PLC, a photosensitive coupling assembly CCD visual detection system, a laser, a pressing block system and a height measurement system, and the laser, the pressing block system, the height measurement system and the CCD visual detection system are all connected to the PLC in communication; The PLC controls the CCD visual inspection system to measure the center point coordinates of each battery cell pole in the battery pack to be welded and the center point coordinates of the CCS corresponding to each battery cell pole; The PLC compares the center point coordinates of each battery cell pole with the center point coordinates of the corresponding CCS one by one to determine whether the welding conditions are met; The PLC controls the pressing system to press each first CCS meeting the welding conditions, controls the height measuring system to measure the first welding distance between the welding surface of each first CCS after pressing and the preset calibration focus position of the laser, and generates a CCS height set based on each first welding distance; The PLC determines whether each first welding distance at which the CCS is highly concentrated is equal to the preset calibrated welding distance, and controls the laser to weld each first CCS corresponding to the equal first welding distance with the corresponding battery cell pole.

9. The welding system according to claim 8, characterized in that The welding system also includes a robot connected to the PLC for communication, and the photosensitive coupling assembly CCD visual detection system, the laser, the pressing block system and the height measurement system are all fixedly installed at the end of the robot; For each first CCS corresponding to the unequal first welding distances, the PLC controls the robot to adjust the height of the laser until the first welding distance of the first CCS is equal to the preset calibrated welding distance; The PLC controls the pressing system to press each adjusted first CCS, and controls the laser to weld each pressed first CCS with the corresponding battery cell pole; The PLC controls the CCD visual inspection system to measure the width of the welding ring on the welding surface of each first CCS after welding, and for each welding ring of the first CCS after welding, determines whether the width of the welding ring is less than a preset threshold value, if not, the welding is completed, if yes, determines that the welding point of the first CCS is a cold joint or a leaking joint, and outputs the center point coordinates of the first CCS and the first welding distance to generate a rework coordinate set; The PLC controls the laser to weld each first CCS in the repair coordinate set to the corresponding battery cell pole, and controls the CCD visual inspection system to measure the width of the welding ring on the welding surface of each first CCS after welding until the width of each welding ring is not less than a preset threshold.

10. The welding system according to claim 9, characterized in that The PLC controls the robot to adjust the center of the laser's welding trajectory circle to the center point of each battery cell pole corresponding to each compressed first CCS, and controls the adjusted laser to weld each first CCS with the corresponding battery cell pole.

Images