CN113020791A - Welding method for outer frame of battery module - Google Patents
Welding method for outer frame of battery module Download PDFInfo
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- CN113020791A CN113020791A CN202110270155.7A CN202110270155A CN113020791A CN 113020791 A CN113020791 A CN 113020791A CN 202110270155 A CN202110270155 A CN 202110270155A CN 113020791 A CN113020791 A CN 113020791A
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- battery module
- galvanometer
- flat plates
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- 238000003466 welding Methods 0.000 title claims abstract description 214
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000035515 penetration Effects 0.000 claims description 29
- 230000004927 fusion Effects 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000011135 tin Substances 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 description 12
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000010008 shearing Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a method for welding an outer frame of a battery module, which comprises the following steps of firstly, determining a plurality of flat plates forming the outer frame of the battery module; then fixing any two adjacent flat plates in the plurality of flat plates, and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module; and the galvanometer welding head is connected with a continuous laser with preset power. Due to the adoption of the continuous laser with preset power and the matching of the galvanometer welding head, the welding of the two flat plates during welding can be prevented, the damage of the battery core in the outer frame is avoided, the potential safety hazard of the battery is reduced and even avoided, and the safety of the battery is improved.
Description
Technical Field
The invention relates to the technical field of laser welding, in particular to a welding method for an outer frame of a battery module.
Background
Laminate polymer battery module comprises electric core in frame and the frame usually, and the frame is the cuboid cavity structure that the end plate by epipleural, downside board, left side board, right side board and both ends constitutes, realizes fixed connection through laser welding between each curb plate and the end plate.
At present, the laser welding between each curb plate and the end plate adopts continuous laser to join in marriage the swing head and welds usually, and the defect of wearing can appear welding usually in this kind of welding mode, leads to the electric core in the frame impaired, makes the battery produce the potential safety hazard.
Disclosure of Invention
The invention provides a method for welding an outer frame of a battery module, which is used for overcoming the defects in the prior art.
The invention provides a method for welding an outer frame of a battery module, which comprises the following steps:
determining a plurality of flat plates forming an outer frame of the battery module;
fixing any two adjacent flat plates in the plurality of flat plates, and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module;
and the galvanometer welding head is connected with a continuous laser with preset power.
According to the welding method of the outer frame of the battery module, the galvanometer welding head is arranged on a worktable of the galvanometer laser welding machine and is connected with a galvanometer movement system on the worktable of the galvanometer laser welding machine, and the galvanometer movement system is used for controlling the welding track of the galvanometer welding head and the distance from the galvanometer welding head to the welding areas of the two flat plates.
According to the welding method for the outer frame of the battery module, provided by the invention, the two flat plates are welded by adopting laser emitted by a vibrating mirror welding head to obtain the outer frame of the battery module, and the welding method specifically comprises the following steps:
determining a preset group value of welding parameters;
and based on the preset group value, welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module.
According to the welding method for the outer frame of the battery module, the preset group value of the welding parameter is determined, and the method specifically comprises the following steps:
based on different groups of values of welding parameters, welding the two sample flat plates by adopting laser emitted by a galvanometer welding head to obtain a welding result corresponding to each group of values;
detecting the fusion depth and the fusion width of the welding result corresponding to each group of values; and/or carrying out a shear force test on the welding result corresponding to each group of values;
and determining the preset group value based on the fusion depth and the fusion width and/or the result of the shear force test.
According to the welding method for the outer frame of the battery module, the preset group value is determined based on the fusion depth and the fusion width and/or the result of the shear force test, and the method specifically comprises the following steps:
and if the penetration of the welding result corresponding to any group of values meets the penetration threshold range, the fusion width meets the fusion width threshold range, and the result of the shear force test meets the shear force requirement, determining that any group of values is the preset group of values.
According to the welding method for the outer frame of the battery module, provided by the invention, based on the preset group value, the two flat plates are welded by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module, and the welding method specifically comprises the following steps:
and based on the preset group value, splicing and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module.
According to the welding method for the outer frame of the battery module, provided by the invention, the welding parameters comprise: the power of the continuous laser, the moving speed of the galvanometer welding head, the jitter type, the jitter radius, the jitter interval and the defocusing amount of the laser.
According to the welding method for the outer frame of the battery module, the jitter type is the jitter of a spiral track, the jitter of an 8-shaped track or the jitter of a wave-shaped track.
According to the welding method for the outer frame of the battery module, the value range of the preset power is 3800W to 4200W.
According to the welding method for the outer frame of the battery module, the plurality of flat plates are made of aluminum, copper, tin or steel.
The invention provides a welding method of an outer frame of a battery module, which comprises the following steps of firstly determining a plurality of flat plates forming the outer frame of the battery module; then fixing any two adjacent flat plates in the plurality of flat plates, and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module; and the galvanometer welding head is connected with a continuous laser with preset power. Due to the adoption of the continuous laser with preset power and the matching of the galvanometer welding head, the welding of the two flat plates during welding can be prevented, the damage of the battery core in the outer frame is avoided, the potential safety hazard of the battery is reduced and even avoided, and the safety of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for welding an outer frame of a battery module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for welding an outer frame of a battery module according to an embodiment of the present invention, as shown in fig. 1, the method includes:
s1, determining a plurality of flat plates forming the outer frame of the battery module;
s2, fixing any two adjacent flat plates in the plurality of flat plates, and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain an outer frame of the battery module;
and the galvanometer welding head is connected with a continuous laser with preset power.
Specifically, the welding method for the outer frame of the battery module provided in the embodiment of the invention is suitable for welding the outer frame of the battery module of a soft package battery, wherein the outer frame of the battery module comprises a plurality of flat plates, for example, the number of the flat plates can be 6, and the flat plates are respectively used as four side plates and two end plates of the outer frame of the battery module.
First, step S1 is executed. The materials of the plurality of flat plates may be aluminum or aluminum alloy, the materials of different flat plates may be the same or different, and the materials of the plurality of flat plates include 5-series aluminum and 6-series aluminum. For example, the material of the plates a and B may be aluminum, and may be 5-series aluminum or 6-series aluminum, or the plate a may be 5-series aluminum and the plate B may be 6-series aluminum.
Next, step S2 is executed. In the welding, first, two flat plates a and B arbitrarily adjacent to each other are selected from the plurality of flat plates, and then the two flat plates a and B are fixed even if the flat plates a and B are in positions where the welding can be performed. In the embodiment of the invention, the fixing module can be adopted for fixing. Fixed module can include pressure head, holding surface and locating part, and dull and stereotyped A fixes on the holding surface, and dull and stereotyped B fixes on the pressure head, and the pressure head passes through the cylinder drive, can remove dull and stereotyped B to can carry out welded assigned position with dull and stereotyped A through the pressure head, then carries out the lock through the locating part and dies fixedly to the pressure head, prevents that the pressure head from continuing to remove. The cylinder is then retracted to the original position. And after the welding of the flat plate A and the flat plate B is finished, withdrawing the pressure head to the original position so as to continuously drive the flat plate C to the specified position where the welding of the flat plate C and the flat plate A or the flat plate B can be carried out. In this way, the descriptions of the embodiments of the present invention are omitted.
After the plate A and the plate B are fixed, the two plates A and B are welded by laser emitted by a galvanometer welding head. And the galvanometer welding head is connected with a continuous laser with preset power, and laser with the preset power emitted by the continuous laser is emitted out through the galvanometer welding head and is used for welding the two flat plates, so that the outer frame of the battery module is obtained. For example, as for the flat plate A, B, C, D, E, F, the flat plates A, B, C, D can be welded sequentially to obtain a rectangular barrel, and then the flat plate E is welded at one end of the rectangular barrel and the flat plate F is welded at the other end of the rectangular barrel. The continuous laser may be a multimode laser or other lasers, the preset power may range from 3800W to 4200W, and 4000W may be preferred from the 3800W to 4200W.
The welding method for the outer frame of the battery module comprises the following steps of firstly, determining a plurality of flat plates forming the outer frame of the battery module; then fixing any two adjacent flat plates in the plurality of flat plates, and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module; and the galvanometer welding head is connected with a continuous laser with preset power. Due to the adoption of the continuous laser with preset power and the matching of the galvanometer welding head, the welding of the two flat plates during welding can be prevented, the damage of the battery core in the outer frame is avoided, the potential safety hazard of the battery is reduced and even avoided, and the safety of the battery is improved.
On the basis of the above embodiment, in the method for welding the outer frame of the battery module provided in the embodiment of the present invention, the galvanometer welding head is disposed on the worktable of the galvanometer laser welding machine, and the galvanometer welding head is connected to a galvanometer movement system on the worktable of the galvanometer laser welding machine, and the galvanometer movement system is configured to control a welding trajectory of the galvanometer welding head and a distance from the galvanometer welding head to a welding area of the two flat plates.
Specifically, in the embodiment of the present invention, the galvanometer welding head may be disposed on a worktable of the galvanometer laser welding machine, and the galvanometer moving system is further disposed on the worktable of the galvanometer laser welding machine, so that the welding track of the galvanometer welding head and the distance from the galvanometer welding head to the welding area of the two flat plates may be controlled by the galvanometer moving system. The welding track can directly influence the aesthetic degree of the welding surface, and the distance from the galvanometer welding head to the welding area of the two flat plates can directly influence the defocusing amount of laser emitted by the galvanometer welding head, so that the welding quality is influenced.
In the embodiment of the invention, the welding track of the welding head of the galvanometer and the distance from the welding track to the welding areas of the two flat plates are controlled by the galvanometer motion system on the worktable of the galvanometer laser welding machine, so that the welding condition can be successfully adjusted to be met and the welding can be carried out in the welding process.
On the basis of the above embodiment, the method for welding an outer frame of a battery module according to the embodiment of the present invention includes welding the two flat plates by using laser emitted from a galvanometer welding head to obtain the outer frame of the battery module, and specifically includes:
determining a preset group value of welding parameters;
and based on the preset group value, welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module.
Specifically, according to the method for welding the outer frame of the battery module provided by the embodiment of the invention, when two flat plates are welded, the preset group value of the welding parameter can be determined firstly. The welding parameters may include power of the continuous laser, moving speed of the galvanometer welding head, type of dithering, radius of dithering, distance of dithering, and defocus amount of laser emitted by the galvanometer welding head. The preset group value is a group of data formed by fixed values of all welding parameters related to a continuous laser and a galvanometer welding head in the welding process. The preset component value may be a predetermined value, and may be a value of each parameter that a welding result obtained by combining a galvanometer welding head and a continuous laser welding meets at least one of a penetration requirement, a fusion width requirement and a shearing force requirement, which is not specifically limited in the embodiment of the present invention.
Then, according to the determined preset value of the welding parameters, welding of the two flat plates can be achieved by the aid of laser emitted by the galvanometer welding head, the outer frame of the battery module can be obtained by welding the flat plates, and welding quality of the outer frame of the battery module can meet at least one of a fusion depth requirement, a fusion width requirement and a shearing force requirement.
In the embodiment of the invention, the preset group value of the welding parameters is determined during welding, and then the plurality of flat plates are welded by adopting laser emitted by the galvanometer welding head according to the preset group value so as to obtain the outer frame of the battery module. The welding quality of the outer frame of the battery module can be ensured to meet at least one of the requirements of penetration, fusion width and shearing force.
On the basis of the above embodiment, the method for welding the outer frame of the battery module provided in the embodiment of the present invention, wherein the determining of the preset group value of the welding parameter specifically includes:
based on different groups of values of welding parameters, welding the two sample flat plates by adopting laser emitted by a galvanometer welding head to obtain a welding result corresponding to each group of values;
detecting the fusion depth and the fusion width of the welding result corresponding to each group of values; and/or carrying out a shear force test on the welding result corresponding to each group of values;
and determining the preset group value based on the fusion depth and the fusion width and/or the result of the shear force test.
Specifically, in the embodiment of the present invention, when the preset group of values of the welding parameters is determined, two sample flat plates may be selected first, and the two sample flat plates are welded by using the laser emitted from the galvanometer welding head through different groups of values of the welding parameters, so as to obtain a welding result corresponding to each group of values; then, the penetration and the width of the welding result corresponding to each group of values can be detected, and the shearing force test can also be carried out on the welding result corresponding to each group of values; and finally, determining a preset group value according to the penetration depth and the penetration width, or determining the preset group value according to a shear force test result, or determining the preset group value according to the penetration depth, the penetration width and the shear force test result, which is not particularly limited in the embodiment of the invention. For example, it may be determined whether the penetration depth meets the penetration depth requirement, whether the penetration width meets the penetration width requirement, and whether the result of the shear force test meets the shear force requirement, and if so, it is determined that a group of values corresponding to the welding result is a preset group of values.
In the embodiment of the invention, a method for determining the preset group value of the welding parameter is provided, so that the subsequent welding quality can meet the requirement.
On the basis of the foregoing embodiment, the method for welding an outer frame of a battery module according to the embodiment of the present invention determines the preset component value based on the penetration depth and the penetration width, and/or the result of the shear force test, and specifically includes:
and if the penetration of the welding result corresponding to any group of values meets the penetration threshold range, the fusion width meets the fusion width threshold range, and the result of the shear force test meets the shear force requirement, determining that any group of values is the preset group of values.
Specifically, in the embodiment of the present invention, the penetration requirement may be that the penetration meets the penetration threshold range, that is, the penetration is within the penetration threshold range; the melting width requirement can be that the melting width meets the melting width threshold range, namely the melting width is within the melting width threshold range; the shear force requirement may be that the shear force peak is equal to or greater than a preset threshold. For any group of values, if the penetration of the welding result corresponding to the group of values meets the penetration threshold range, the penetration meets the penetration threshold range, and the result of the shear force test meets the shear force requirement, the group of values can be determined to be a preset group of values, so that the subsequent welding quality can be further ensured.
On the basis of the above embodiment, the method for welding an outer frame of a battery module according to the embodiment of the present invention includes, based on the preset group value, welding the two flat plates by using laser emitted from a galvanometer welding head to obtain the outer frame of the battery module, and specifically includes:
and based on the preset group value, splicing and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module.
In particular, in the embodiment of the invention, the welding mode adopted when the two flat plates are welded is tailor welding, so that the laser can be prevented from being transmitted to the inside of the outer frame of the battery module to damage the surface of the battery cell, and the welding safety is improved.
On the basis of the above embodiment, in the method for welding an outer frame of a battery module provided in the embodiment of the present invention, the welding parameters include: the power of the continuous laser, the moving speed of the galvanometer welding head, the jitter type, the jitter radius, the jitter interval and the defocusing amount of the laser emitted by the galvanometer welding head.
On the basis of the above embodiments, in the welding method for the outer frame of the battery module provided in the embodiments of the present invention, the jitter type is jitter of a spiral track, jitter of an "8" -shaped track, or jitter of a wave-shaped track.
Specifically, in the embodiment of the present invention, the jitter type refers to a motion trajectory of the galvanometer welding head, and may be a spiral trajectory, an "8" shaped trajectory, a wave shaped trajectory, or the like. Preferably, the spiral path can be designed to be wobbled, so that the welding strength can be ensured.
On the basis of the above embodiment, in the welding method for the outer frame of the battery module provided in the embodiment of the invention, the plurality of flat plates are made of aluminum, copper, tin or steel.
Specifically, the materials of the plurality of flat plates in the embodiment of the present invention may be the same, and all of the flat plates are aluminum, copper, tin or steel. The different plates may belong to the same series of materials or different series of materials under the same material, for example, the materials of the plates are all aluminum. Since the aluminum is classified into 5-series aluminum and 6-series aluminum, the materials of the different plates may be different series aluminum, for example, the material of the plate a is 5-series aluminum, and the material of the plate B may be either 5-series aluminum or 6-series aluminum, which is not particularly limited in the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A battery module outer frame welding method is characterized by comprising the following steps:
determining a plurality of flat plates forming an outer frame of the battery module;
fixing any two adjacent flat plates in the plurality of flat plates, and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module;
and the galvanometer welding head is connected with a continuous laser with preset power.
2. The method for welding the outer frame of the battery module according to claim 1, wherein the galvanometer welding head is arranged on a worktable of a galvanometer laser welder and is connected with a galvanometer movement system on the worktable of the galvanometer laser welder, and the galvanometer movement system is used for controlling a welding track of the galvanometer welding head and a distance from the galvanometer welding head to a welding area of the two flat plates.
3. The method for welding the outer frame of the battery module according to claim 1, wherein the welding the two flat plates with the laser emitted from the galvanometer welding head to obtain the outer frame of the battery module comprises:
determining a preset group value of welding parameters;
and based on the preset group value, welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module.
4. The method for welding the outer frame of the battery module according to claim 3, wherein the determining of the preset group of values of the welding parameters specifically comprises:
based on different groups of values of welding parameters, welding the two sample flat plates by adopting laser emitted by a galvanometer welding head to obtain a welding result corresponding to each group of values;
detecting the fusion depth and the fusion width of the welding result corresponding to each group of values; and/or carrying out a shear force test on the welding result corresponding to each group of values;
and determining the preset group value based on the fusion depth and the fusion width and/or the result of the shear force test.
5. The method for welding the outer frame of the battery module according to claim 4, wherein the determining the preset group value based on the results of the penetration and the width of fusion and/or the shear test specifically comprises:
and if the penetration of the welding result corresponding to any group of values meets the penetration threshold range, the fusion width meets the fusion width threshold range, and the result of the shear force test meets the shear force requirement, determining that any group of values is the preset group of values.
6. The method for welding the outer frame of the battery module according to claim 3, wherein the welding the two flat plates with the laser emitted from the galvanometer welding head based on the preset group value to obtain the outer frame of the battery module specifically comprises:
and based on the preset group value, splicing and welding the two flat plates by adopting laser emitted by a galvanometer welding head to obtain the outer frame of the battery module.
7. The method for welding the outer frame of the battery module according to claim 3, wherein the welding parameters comprise: the power of the continuous laser, the moving speed of the galvanometer welding head, the jitter type, the jitter radius, the jitter interval and the defocusing amount of the laser.
8. The method for welding the outer frame of the battery module according to claim 7, wherein the type of the vibration is a vibration of a spiral track, a vibration of an 8-shaped track or a vibration of a wave-shaped track.
9. The method for welding the outer frame of the battery module according to claim 7, wherein the preset power ranges from 3800W to 4200W.
10. The method for welding the outer frame of a battery module according to any one of claims 1 to 9, wherein the flat plates are made of aluminum, copper, tin or steel.
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| CN108526693A (en) * | 2018-03-20 | 2018-09-14 | 广东省焊接技术研究所（广东省中乌研究院） | A kind of laser welding with filler wire method of power battery module end plate and side plate |
| CN110000472A (en) * | 2019-02-26 | 2019-07-12 | 武汉力神动力电池系统科技有限公司 | A kind of method for laser welding of power battery module aluminium alloy end plate and side plate |
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