CN110640319A - Laser welding device for side end plate of square lithium battery module - Google Patents
Laser welding device for side end plate of square lithium battery module Download PDFInfo
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- CN110640319A CN110640319A CN201910774491.8A CN201910774491A CN110640319A CN 110640319 A CN110640319 A CN 110640319A CN 201910774491 A CN201910774491 A CN 201910774491A CN 110640319 A CN110640319 A CN 110640319A
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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
- B23K26/24—Seam welding
-
- 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
- B23K26/70—Auxiliary operations or equipment
-
- 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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention relates to a laser welding device for an end side plate of a square lithium battery module, which mainly comprises a bottom plate, an end face fixed limiting plate, an end face movable limiting plate, a side supporting plate, a welding pressing plate, an insulating locating plate, an end plate locating bar, an upper pressing plate, a splash-proof protecting plate and an end face pressing mechanism, wherein the end face fixed limiting plate is arranged on the bottom plate; the square lithium battery module is convenient to operate, and when the square lithium battery module is used, the end face pressing mechanism can be operated to press the module to the process length only by placing all components of the square lithium battery module into the device according to the process sequence and positioning the components, so that the laser welding requirement between the end plate and the side plate of the module is met; the invention has the advantages of lower manufacturing cost, stable and reliable welding quality and good compatibility with laser welding equipment, improves the utilization rate of the existing laser welding equipment, reduces the cost burden in the product development process of enterprises, and is particularly suitable for being applied in laboratories or small-batch production places.
Description
Technical Field
The invention relates to the field of lithium battery module manufacturing, in particular to a laser welding device for end side plates of a square lithium battery module.
Background
In square lithium ion battery PACK manufacturing process, the module shaping process is indispensable, and this process is at first extrudeed the module to technology length size through the mode of extrusion module both ends end plate, then opens laser welding equipment, assembles the kneck between end plate and the curb plate that the battery cell enclosed all around and carries out welding operation in groups to finally make each component part of module connect up and close as an organic whole.
For satisfying the diversified demand in market, the battery module variety that the lithium cell manufacturing enterprise made on the one hand is various, the research and development of on the other hand new product also adopts multiple design and new production technology with the experiment, consequently, end plate and curb plate laser welding technology in the module shaping also respectively have a difference, however, the current laser welding equipment of enterprise is difficult to be compatible to this, lead to equipment utilization not high, and if purchase new equipment, the cost burden of enterprise will be increased again, in new product research and development pilot plant occasion, because the product is not complete shaping yet, the kind is complicated changeable, consequently this kind of condition can be more outstanding.
Disclosure of Invention
The invention aims to provide a laser welding device for end plates of a square lithium battery module, which is convenient for welding the end plates and the side plates of the square lithium battery module and improves the welding efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a side board laser welding device of square lithium battery module, includes:
a base plate;
the end face fixing limiting plate is fixed at one end of the bottom plate;
the other end of the bottom plate is provided with a sliding chute, the end face movable limiting plate is in sliding fit with the sliding chute, the end face movable limiting plate is connected with the bottom plate through a bolt, and the end face movable limiting plate is opposite to the end face fixed limiting plate;
the two side supporting plates are symmetrically fixed on two sides of the bottom plate and are positioned between the end face fixed limiting plate and the end face movable limiting plate;
the four welding pressure heads are respectively fixed at the end parts of the two side supporting plates through bolts, and welding seam avoiding grooves are formed in the surfaces of any welding pressure heads;
the insulating positioning plate is fixed on the bottom plate and positioned between the two side supporting plates;
the two end plate positioning strips are respectively fixed at two ends of the insulating positioning plate;
the upper pressure plate is fixed on the two side supporting plates through bolts;
the splash-proof protection plate is fixed on the lower surface of the upper pressing plate, and welding slag protection strips are arranged at two ends of the splash-proof protection plate;
and the end face pressing mechanism is used for abutting the movable limiting plate on an end plate of the square lithium battery module.
Preferably, the surface of the bottom plate is provided with a rectangular sinking groove for accommodating the battery module, the sliding groove is positioned at one end of the rectangular sinking groove, and the other end of the rectangular sinking groove is provided with a positioning groove for installing an end face fixing limiting plate; the two side supporting plates are fixed along two side edges of the rectangular sinking groove respectively, the two end plate positioning strips are fixed along two end edges of the rectangular sinking groove respectively, and the insulating positioning plate is fixed in the rectangular sinking groove.
Preferably, the end face fixed limiting plate and the end face movable limiting plate are L-shaped plates with the same size.
Preferably, the side support plates are of a "mountain" configuration.
Preferably, the end plate positioning strip is of a concave structure.
Preferably, step surfaces are formed on two sides of the insulating positioning plate.
Preferably, the end face pressing mechanism comprises an L-shaped plate and an extrusion plate, a trapezoidal nut is fixed in the middle of a vertical plate of the L-shaped plate, a trapezoidal screw rod is installed in the trapezoidal nut, a bushing is fixed at the center of the extrusion plate, and one end of the trapezoidal screw rod is rotatably connected with the bushing and limited through a clamp spring; a rotating handle is fixed at the other end of the trapezoidal screw rod; two guide shafts are respectively arranged on the two sides of the trapezoidal nut on the L-shaped plate through linear bearings, and one ends of the guide shafts are connected with the extrusion plate.
Preferably, waist-shaped mounting holes are distributed on the surface of the bottom plate at intervals, and at least two handles are fixed on the bottom plate.
Preferably, rectangular lightening holes are distributed on the upper pressure plate at intervals.
The invention has the beneficial effects that:
the invention has convenient operation, and when in use, the end face pressing mechanism can be operated to press the module to the process length only by putting all the components of the square lithium battery module into the device according to the process sequence and positioning the components, thereby meeting the requirement of laser welding between the end plate and the side plate of the module.
The invention has the advantages of lower manufacturing cost and stable and reliable welding quality, once the product is remodeled or the process parameters are changed, the whole size of the device is only required to be changed into a new device (the laser welding equipment is not required to be changed), the device has good compatibility with the laser welding equipment, the utilization rate of the existing laser welding equipment is improved, the cost burden in the product development process of enterprises is reduced, and the device is particularly suitable for being applied in laboratories or small-batch production places.
Drawings
Fig. 1 is a schematic structural view of a square lithium battery module;
FIG. 2 is a schematic side plate structure of a square lithium battery module;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a schematic view of the present invention with the upper platen removed;
FIG. 5 is a schematic view of the present invention with the splash guard removed;
FIG. 6 is a schematic structural view of the base plate of the present invention;
FIG. 7 is a schematic structural view of the end face hold-down mechanism of the present invention;
FIG. 8 is a top partial cross-sectional view of the end face press mechanism of the present invention;
FIG. 9 is a schematic end view of the present invention;
FIG. 10 is a schematic view of the insulating positioning plate;
FIG. 11 is a schematic structural view of an end plate locator bar of the present invention;
fig. 12 is a schematic structural view of the battery module according to the present invention after being placed;
in the figure: 1-bottom plate, 101-rectangular sinking groove, 102-sliding groove, 103-positioning groove, 104-waist-shaped mounting hole, 2-handle, 3-end face fixing limiting plate, 4-end face moving limiting plate, 5-end face pressing mechanism, 51-L-shaped plate, 52-extrusion plate, 53-trapezoidal copper nut, 54-trapezoidal screw rod, 55-copper bush, 56-snap spring, 57-rotating handle, 58-linear bearing, 59-guide shaft, 6-side supporting plate, 7-welding pressure head, 71-welding seam avoiding groove, 8-upper pressure plate, 9-splash-proof protecting plate, 91-welding slag protecting strip, 10-end plate positioning strip, 11-insulating positioning plate, 111-step surface, 12-battery module, 121-end plate, end plate, 122-side plate, 123-single battery.
Detailed Description
The invention will be further described with reference to the following detailed description and the accompanying drawings:
as shown in fig. 1 and 2, in the conventional structure of a square lithium battery module, end plates 121 are disposed at two ends of a single battery 123 assembled in a group, the end plates 121 are pressed to a predetermined length, side plates 122 are added to two side surfaces of the module, and finally, a joint between the end plates 121 and the side plates 122 is welded by a laser welding device to complete module molding, and the end surfaces of the side plates 122 of the module are bent, so that a joint gap (welding line) between the side plates 121 and the end plate 122 is located on the surface of the end plate 121.
Referring to fig. 3-5, the laser welding device for the end side plates of the square lithium battery module comprises a bottom plate 1, an end face fixing limiting plate 3, an end face moving limiting plate 4, an end face pressing mechanism 5, a side supporting plate 6, a welding pressure head 7, an upper pressing plate 8, a splash-proof protecting plate 9, an end plate positioning strip 10 and an insulating positioning plate 11.
Referring to fig. 6, the bottom plate 1 of the present embodiment is provided with a rectangular sinking groove 101 for accommodating the battery module 12, one end of the rectangular sinking groove 101 is provided with a sliding groove 102, and the other end of the rectangular sinking groove 101 is provided with a positioning groove 103.
Waist-shaped mounting holes 104 are distributed on the surface of the base plate 1 at intervals, the waist-shaped mounting holes 104 are used for being assembled with a workbench of laser welding equipment, and meanwhile handles 2 are symmetrically fixed on two sides of the base plate 1, so that the carrying is convenient.
The end face fixed limiting plate 3 and the end face movable limiting plate 4 in this embodiment are L-shaped plates having the same size, the end face fixed limiting plate 3 is fixed in the positioning groove 103 by being clamped and embedded by a bolt, and the end face movable limiting plate 4 is opposite to the end face fixed limiting plate 3 and is in sliding fit with the sliding groove 102.
The end face pressing mechanism 5 is used for pushing the end face movable limiting plate 4 to move towards the end face fixed limiting plate 3 side along the sliding groove 102 (pressing the end plate 121 of the battery module), the sliding groove 102 and the end face movable limiting plate 4 are both provided with bolt holes, when the end face movable limiting plate 4 moves to the position where bolt hole positions of the bolt holes coincide with those of the sliding groove 102, the end face movable limiting plate 4 is fixed through bolts, and the technological length requirement of the battery module is met between the end face fixed limiting plate 3 and the end face movable limiting plate 4 at the moment.
Referring to fig. 7 and 8, the end face pressing mechanism of the present embodiment includes an L-shaped plate 51 and an extrusion plate 52, a trapezoidal copper nut 53 is fixed in the middle of a vertical plate of the L-shaped plate 51, a trapezoidal screw 54 is installed in the trapezoidal copper nut 53, a copper bush 55 is fixed at the center of the extrusion plate 52, and one end of the trapezoidal screw 54 is rotatably connected with the copper bush 55 and is limited by a snap spring 56; a rotary handle 57 is fixed to the other end of the trapezoidal screw 54.
Two guide shafts 59 are respectively arranged on the L-shaped plate 51 at two sides of the trapezoidal copper nut 53 through linear bearings 58, one ends of the guide shafts 59 are connected with the extrusion plate 52 to form a front-back moving pair, and the extrusion plate 52 can be adjusted to press the end face movable limiting plate 4 through rotating the handle 57.
Two side support plates 6 are respectively fixed along two side edges of the rectangular sinking groove 101, the side support plates 6 are of a 'mountain' -shaped structure, and bolt mounting holes are formed in the top and two ends of the side support plates.
Referring to fig. 9, both ends of each side support plate 6 are fixed with welding indenters 7 by bolts, and a welding seam avoiding groove 71 is formed in the surface of each welding indenter 7 at a position corresponding to a connecting seam between the module end plate 121 and the side plate 122, so that laser welding is facilitated; the welding ram 7 also serves to limit the position of the end plate 121 of the module.
The top board 8 is fixed at the top of the two side supporting plates 6 through bolts, the splash-proof protection plate 9 is fixed on the lower surface of the top board 8 through bolts, the welding slag protection strips 91 are arranged at the two ends of the splash-proof protection plate 9, the splash-proof protection plate 9 can cover the upper surface of the battery module after the top board 8 is fixed, and the welding slag protection strips 91 can effectively protect the two ends of the module from being damaged by the welding slag in the welding process.
Rectangular lightening holes are distributed on the upper pressure plate 8 at intervals, so that the weight of the whole device is lightened.
Insulating locating plate 11 passes through the bolt fastening and sinks inslot 101 at the rectangle, and the width and the heavy groove 101 of rectangle of insulating locating plate 11 match, and the length of insulating locating plate 11 is less than heavy groove 101 length of rectangle, and the space that supplies end plate location strip 10 to install is left at both ends, and two end plate location strips 10 then pass through the bolt fastening respectively along the both ends limit that sinks inslot 101 at the rectangle.
Referring to fig. 10, the insulation positioning plate 11 of the present embodiment forms a protrusion in the middle, and has a structure with stepped surfaces 111 at both sides, the protrusion surface contacts with the bottom of the single battery 123 of the battery module to perform a supporting function, and the stepped surfaces at both sides can be embedded with the lower end edge of the side plate 122 to perform a certain positioning function.
Referring to fig. 11, the end plate positioning strip 10 of the present embodiment has a concave structure, the groove portion of the end plate positioning strip 10 can position the end plate 121, and the protruding portions at both ends can position the side plate 122.
The operation method of the invention is as follows:
firstly, the whole device is installed on a workbench of laser welding equipment, then two end plates 121 are respectively arranged in grooves of an end plate positioning strip 10 for initial positioning, then a single battery 123 is sequentially placed in an area between two end plates 12, then an end face pressing mechanism 5 is operated to enable an extrusion plate 52 to push an end face movable limiting plate 4 to move forward and gradually extrude the end plates 121, after bolt installation holes in the end face movable limiting plate 4 correspond to bolt holes in a sliding groove 102, the end face movable limiting plate 4 is screwed up by bolts to be fixed, at the moment, a battery module is pressed to a process length, and the end face pressing mechanism 5 is operated to return to an original position.
The two side plates 122 are well inserted and positioned from the side surfaces of the battery module, the bent parts of the end parts of the side plates 122 are arranged on the protrusions of the end plate positioning strips 10, and the bent parts of the lower ends of the side plates 122 are inserted into the step surfaces of the insulating positioning plates 11; the clamping and embedding position of the bent edge of the end part of the side plate 122 and the end plate 121 is a welding interface, four welding pressure heads 7 are respectively fixed at two ends of the side support plate 6 through bolts to compress the welding seam interfaces, the splash-proof protection plate 9 is fixed on the lower surface of the upper pressure plate 8, the upper pressure plate 8 is fixed at the top of the side support plate 6, the upper surface and the end surface of the battery module are pressed to be close to the welding seam, and laser welding operation can be carried out.
After welding, the upper pressing plate 8 and the four welding pressing heads 7 are respectively taken down, the bolts are unscrewed to push the end face movable limiting plate 4 to return to the initial position along the sliding groove 102, all the operations are completed, and a worker can take the welded battery module 12 out of the device.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The utility model provides a side board laser welding device of square lithium battery module, its characterized in that: the method comprises the following steps:
a base plate;
the end face fixing limiting plate is fixed at one end of the bottom plate;
the other end of the bottom plate is provided with a sliding chute, the end face movable limiting plate is in sliding fit with the sliding chute, the end face movable limiting plate is connected with the bottom plate through a bolt, and the end face movable limiting plate is opposite to the end face fixed limiting plate;
the two side supporting plates are symmetrically fixed on two sides of the bottom plate and are positioned between the end face fixed limiting plate and the end face movable limiting plate;
the four welding pressure heads are respectively fixed at the end parts of the two side supporting plates through bolts, and welding seam avoiding grooves are formed in the surfaces of any welding pressure heads;
the insulating positioning plate is fixed on the bottom plate and positioned between the two side supporting plates;
the two end plate positioning strips are respectively fixed at two ends of the insulating positioning plate;
the upper pressure plate is fixed on the two side supporting plates through bolts;
the splash-proof protection plate is fixed on the lower surface of the upper pressing plate, and welding slag protection strips are arranged at two ends of the splash-proof protection plate;
and the end face pressing mechanism is used for abutting the movable limiting plate on an end plate of the square lithium battery module.
2. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: the surface of the bottom plate is provided with a rectangular sinking groove for accommodating a battery module, the sliding groove is positioned at one end of the rectangular sinking groove, and the other end of the rectangular sinking groove is provided with a positioning groove for installing an end face fixing limiting plate; the two side supporting plates are fixed along two side edges of the rectangular sinking groove respectively, the two end plate positioning strips are fixed along two end edges of the rectangular sinking groove respectively, and the insulating positioning plate is fixed in the rectangular sinking groove.
3. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: the end face fixed limiting plate and the end face movable limiting plate are L-shaped plates with the same size.
4. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: the side supporting plate is of a mountain-shaped structure.
5. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: the end plate positioning strip is of a concave structure.
6. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: and step surfaces are formed on two sides of the insulating positioning plate.
7. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: the end face pressing mechanism comprises an L-shaped plate and an extrusion plate, a trapezoidal nut is fixed in the middle of a vertical plate of the L-shaped plate, a trapezoidal screw rod is installed in the trapezoidal nut, a bushing is fixed at the center of the extrusion plate, and one end of the trapezoidal screw rod is rotatably connected with the bushing and limited through a clamp spring; a rotating handle is fixed at the other end of the trapezoidal screw rod; two guide shafts are respectively arranged on the two sides of the trapezoidal nut on the L-shaped plate through linear bearings, and one ends of the guide shafts are connected with the extrusion plate.
8. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: waist-shaped mounting holes are distributed on the surface of the bottom plate at intervals, and at least two handles are fixed on the bottom plate.
9. The laser welding device for the end side plate of the square lithium battery module as claimed in claim 1, wherein: rectangular lightening holes are distributed on the upper pressure plate at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910774491.8A CN110640319B (en) | 2019-08-21 | 2019-08-21 | Laser welding device for side end plate of square lithium battery module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910774491.8A CN110640319B (en) | 2019-08-21 | 2019-08-21 | Laser welding device for side end plate of square lithium battery module |
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| CN110640319A true CN110640319A (en) | 2020-01-03 |
| CN110640319B CN110640319B (en) | 2021-08-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111900299A (en) * | 2020-08-12 | 2020-11-06 | 浙江南都电源动力股份有限公司 | Aluminum-shell battery module frame and welding tool thereof |
| CN112658567A (en) * | 2020-12-15 | 2021-04-16 | 大族激光科技产业集团股份有限公司 | Battery module plastic side welding positioning mechanism and assembly shaping device |
| CN115106706A (en) * | 2022-08-30 | 2022-09-27 | 佛山市天劲新能源科技有限公司 | Battery pack side plate welding and positioning device and using method thereof |
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| CN109483056A (en) * | 2018-12-28 | 2019-03-19 | 苏州迅镭激光科技有限公司 | A kind of side's housing battery side plate laser welding apparatus |
| CN109773390A (en) * | 2019-01-30 | 2019-05-21 | 无锡奥特维智能装备有限公司 | Battery module backpack cover welder |
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| CN111900299A (en) * | 2020-08-12 | 2020-11-06 | 浙江南都电源动力股份有限公司 | Aluminum-shell battery module frame and welding tool thereof |
| CN111900299B (en) * | 2020-08-12 | 2023-12-12 | 浙江南都电源动力股份有限公司 | Aluminum shell battery module frame and welding tool thereof |
| CN112658567A (en) * | 2020-12-15 | 2021-04-16 | 大族激光科技产业集团股份有限公司 | Battery module plastic side welding positioning mechanism and assembly shaping device |
| CN115106706A (en) * | 2022-08-30 | 2022-09-27 | 佛山市天劲新能源科技有限公司 | Battery pack side plate welding and positioning device and using method thereof |
| CN115106706B (en) * | 2022-08-30 | 2022-11-25 | 佛山市天劲新能源科技有限公司 | Battery pack side plate welding and positioning device and using method thereof |
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