CN113231761A - Binary channels battery welds end device - Google Patents
Binary channels battery welds end device Download PDFInfo
- Publication number
- CN113231761A CN113231761A CN202110361356.8A CN202110361356A CN113231761A CN 113231761 A CN113231761 A CN 113231761A CN 202110361356 A CN202110361356 A CN 202110361356A CN 113231761 A CN113231761 A CN 113231761A
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- assembly
- welding
- battery
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- conveying
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
Abstract
The invention discloses a dual-channel battery bottom welding device which comprises a rack, a conveying assembly, a welding assembly, a testing assembly and a pressure tank assembly, wherein the conveying assembly is arranged on the rack; the conveying assembly comprises a conveying groove and a pushing component, and two welding assemblies are arranged on the conveying groove in parallel; the testing assembly is provided with a turntable, and the outer side of the turntable is sequentially provided with a tab positioning assembly, a welding spot detection assembly, an insulating pad placing assembly, a short circuit detection assembly and a shunt assembly; the shunt assembly is connected with the test assembly and the pressure tank assembly; the welding assembly comprises a welding pin fixture, a welding head and a welding cylinder for driving the welding pin fixture to move in the vertical direction. By arranging the conveying assembly and the welding assembly, the dual-channel battery bottom welding device can perform bottom welding operation on two batteries simultaneously and convey the batteries forwards synchronously through the conveying assembly, so that the processing efficiency of battery bottom welding is improved; through setting up test assembly and controller, detect the battery after carrying out the welding, improve the yields of battery production.
Description
Technical Field
The invention relates to the technical field of battery production, in particular to a dual-channel battery bottom welding device.
Background
In the manufacturing process of the cylindrical lithium ion battery, the welding of the cathode tab and the bottom of the shell is a key process, and the process is easy to have the defects of unstable welding or over-welding, poor welding stability and low percent of pass. Particularly, the lithium battery adopting the pure copper tab has the advantage that the copper tab is more difficult to be welded firmly due to the particularity of the material. Part of manufacturers adopt a mode of twice welding to weld the lug and the bottom of the shell, and a single-station welding device has the problem of reduction of the welding speed of the battery, so that the production efficiency of the lithium battery is greatly influenced; and the production efficiency is improved by simply adding the welding station, so that the production cost of the battery can be greatly improved.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a dual-channel battery bottom-welding device, which is used to implement dual-channel battery bottom-welding operation and improve the yield and processing efficiency of battery bottom-welding.
The technical scheme adopted by the invention for solving the problems is as follows:
a dual-channel battery bottom welding device comprises a rack, a conveying assembly, a welding assembly, a testing assembly and a pressure tank assembly; the conveying assembly comprises a conveying groove and a pushing component, and two welding assemblies are arranged on the conveying groove in parallel; the testing assembly is provided with a turntable, and the outer side of the turntable is sequentially provided with a tab positioning assembly, a welding spot detection assembly, an insulating pad placing assembly, a short circuit detection assembly and a shunt assembly; the shunt assembly is connected with the test assembly and the pressure tank assembly; the welding assembly comprises a welding needle clamp, a welding head and a welding cylinder for driving the welding needle clamp to move in the vertical direction; the rack is provided with a controller, and the conveying assembly, the welding assembly, the testing assembly and the pressure tank assembly are all electrically connected with the controller.
The dual-channel battery bottom welding device at least has the following beneficial effects: by arranging the conveying assembly and the welding assembly, the dual-channel battery bottom welding device can perform bottom welding operation on two batteries simultaneously and convey the batteries forwards synchronously through the conveying assembly, so that the processing efficiency of battery bottom welding is improved; through setting up test assembly and controller, detect the battery after carrying out the welding, improve the yields of battery production.
Furthermore, one end of the conveying groove is connected with a feeding disc, and the other end of the conveying groove is opposite to the turntable; and a middle hole detection device is arranged between the feeding disc and the welding assembly. Through setting up charging tray and well hole detection device, improve the functioning speed of battery, also guarantee that the battery appears the condition that the hole blockked up in the battery before the operation of welding the end.
Further, the pushing component is provided with a feeding cylinder, and the feeding cylinder is positioned between the welding assembly and the rotating disc; and a feeding sensor is arranged on the conveying groove, and the feeding cylinder is electrically connected with the feeding sensor. Through setting up material loading cylinder and material loading sensor, can control the battery accurately and transmit on the transfer tank, improve the stability and the conveying efficiency of binary channels battery welding end device.
Furthermore, utmost point ear locating component includes location probe, drive wheel, driving motor and drive the location cylinder that the drive wheel moved on the horizontal direction, driving motor drive the drive wheel rotates. Through setting up positioning probe and drive wheel, the position of utmost point ear can be fixed a position utmost point ear accurately to utmost point ear locating component of being convenient for to drive battery rotates, makes utmost point ear remove appointed position, improves the accurate nature in location of binary channels battery end welding device.
Further, the welding spot detection assembly comprises a clamp, a baffle and a detection cylinder for driving the clamp to move in the vertical direction; the clamp is opposite to the baffle. Through setting up anchor clamps and baffle, can control the test dynamics of anchor clamps centre gripping utmost point ear accurately, improve the accurate nature and the detection efficiency that the solder joint detected.
Furthermore, the insulating pad placing assembly comprises an insulating pad material tray, a stamping part, a feeding part and a placing cylinder for driving the feeding part to move. Through setting up insulating pad charging tray and punching press part, can stably carry insulating pad fast to the battery, improve the machining efficiency of battery.
Further, the short circuit detection assembly comprises a test arm, a pressing sheet and an electrified part; the test arm and the pressing sheet are connected with the electrifying component; the press sheet is positioned on the side surface of the turntable, and the test arm extends downwards to the upper part of the press sheet. Through setting up short circuit detection subassembly, can detect the electric connectivity of utmost point ear and battery case fast, guarantee the end quality of welding of battery.
Further, the shunting assembly comprises a shunting groove, a recovery bin and a shunting cylinder for driving the shunting groove to move in the horizontal direction; the splitter box is positioned above the recovery bin. Through setting up the splitter box and retrieving the storehouse, be convenient for collect the processing unqualified battery, guarantee the yields of battery processing.
Further, the indent subassembly includes depression bar, rolling wheel and pushes down the portion, go up the depression bar and be connected with down and push down the cylinder, it is connected with the rolling motor to push down the portion. Through setting up depression bar and push down portion, the rolling wheel can carry out quick, stable indent operation to the battery, improves the yields of battery processing.
Furthermore, a control key and a display screen are arranged on the rack; the control key and the display screen are electrically connected with the controller. Through setting up control button and display screen, the producer of being convenient for can observe the operation situation of present binary channels battery bottom welding device directly perceivedly to carry out the aperture adjustment to battery bottom welding device through the control button, improve the convenience of use of binary channels battery bottom welding device.
The double-channel battery bottom welding device has the beneficial effects that: by arranging the conveying assembly and the welding assembly, the dual-channel battery bottom welding device can perform bottom welding operation on two batteries simultaneously and convey the batteries forwards synchronously through the conveying assembly, so that the processing efficiency of battery bottom welding is improved; the welded battery is detected by arranging the test component and the controller, so that the yield of battery production is improved; by arranging the feeding disc and the middle hole detection device, the running speed of the battery is improved, and the condition that the middle hole of the battery is blocked before bottom welding operation of the battery is also ensured; through setting up material loading cylinder and material loading sensor, can control the battery accurately and transmit on the transfer tank, improve the stability and the conveying efficiency of binary channels battery welding end device.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a dual-channel battery bottom-bonding apparatus according to an embodiment of the present invention;
FIG. 2 is a structural diagram of another angle of a dual channel battery bottom bonding apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of a dual channel battery backing apparatus according to an embodiment of the present invention;
FIG. 4 is an enlarged view of portion A of FIG. 1;
FIG. 5 is a block diagram of the weld stack of FIG. 1;
fig. 6 is a block diagram of the tab positioning assembly of fig. 3;
FIG. 7 is a block diagram of the solder joint detection assembly of FIG. 3;
FIG. 8 is a block diagram of the insulation pad placement assembly of FIG. 3;
FIG. 9 is a block diagram of the short circuit detection assembly of FIG. 3;
FIG. 10 is a block diagram of the shunt assembly of FIG. 3;
figure 11 is a block diagram of the pressure tank assembly of figure 3.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1 to 5, an embodiment of the present invention provides a dual-channel battery bottom-welding device, including a frame 100, a conveying assembly 200, a welding assembly 300, a testing assembly 400, and a groove-pressing assembly 500; the conveying assembly 200 comprises a conveying groove 210 and a pushing component 220, wherein two welding assemblies 300 are arranged on the conveying groove 210 in parallel; the testing assembly 400 is provided with a turntable 410, and the outer side of the turntable 410 is sequentially provided with a tab positioning assembly 420, a welding spot detection assembly 430, an insulating pad placing assembly 440, a short circuit detection assembly 450 and a shunt assembly 460; the shunt assembly 460 is connected with the test assembly 400 and the sink assembly 500; the welding assembly 300 includes a needle holder 310, a welding head (not shown), and a welding cylinder 320 for driving the needle holder 310 to move in a vertical direction; the rack 100 is provided with a controller 110, and the conveying assembly 200, the welding assembly 300, the testing assembly 400 and the sink assembly 500 are electrically connected to the controller 110.
By arranging the conveying assembly 200 and the welding assembly 300, the dual-channel battery bottom welding device can perform bottom welding operation on two batteries at the same time, and the batteries are synchronously conveyed forwards through the conveying assembly 200, so that the processing efficiency of battery bottom welding is improved; through setting up test assembly 400 and controller 110, detect the battery after carrying out the welding, improve the yields of battery production.
In another embodiment, one end of the conveying groove 210 is connected with the upper tray 150, and the other end of the conveying groove 210 is opposite to the turntable 410; a middle hole detection device 160 is arranged between the feeding tray 150 and the welding assembly 300. By arranging the feeding tray 150 and the middle hole detection device 160, the running speed of the battery is improved, and the situation that holes in the battery are blocked before bottom welding operation of the battery is also ensured. In this embodiment, the turntable 410 is connected to a turntable motor (not shown), and the turntable motor drives the turntable 410 to drive the batteries to rotate on the testing assembly 400 in turn.
Referring to fig. 4, in another embodiment, the pushing member 220 is provided with a feeding cylinder 221, and the feeding cylinder 221 is located between the welding assembly 300 and the rotating disc 410; the transfer tank 210 is provided with a feed sensor 211, and the feed cylinder 221 is electrically connected to the feed sensor 211. Through setting up material loading cylinder 221 and material loading sensor 211, can control the battery accurately and transmit on transfer tank 210, improve the stability and the conveying efficiency of two-channel battery bottom welding device.
Referring to fig. 6, in another embodiment, the tab positioning assembly 420 includes a positioning probe 421, a driving wheel 422, a driving motor 423, and a positioning cylinder 424 for driving the driving wheel 422 to move in a horizontal direction, wherein the driving motor 423 drives the driving wheel 422 to rotate. Through setting up location probe 421 and drive wheel 422, the position of utmost point ear can be accurately fixed a position to utmost point ear locating component 420 of being convenient for to drive battery rotates, makes utmost point ear remove appointed position, improves the accurate nature in location of binary channels battery welding end device.
Referring to fig. 7, another embodiment, a solder joint inspection assembly 430 includes a jig 431, a barrier 432, and an inspection cylinder 433 driving the jig 431 to move in a vertical direction; clamp 431 is positioned opposite bezel 432. Through setting up anchor clamps 431 and baffle 432, can control the test dynamics of anchor clamps 431 centre gripping utmost point ear accurately, improve the accurate nature and the detection efficiency that the solder joint detected.
Referring to fig. 8, another embodiment, the insulation pad placement assembly 440 includes an insulation pad tray 441, a punching part 442, a feeding part 443, and a placement cylinder 444 driving the feeding part 443 to move. Through setting up insulating pad charging tray 441 and punching press part 442, can stably carry the insulating pad to the battery fast, improve the machining efficiency of battery.
Referring to fig. 9, in another embodiment, the short detection assembly 450 includes a test arm 451, a blade 452, and a power on component (not shown); the test arm 451 and the wafer 452 are connected to the energizing part; the press blade 452 is positioned on the side of the turntable 410 and the test arm 451 extends downwardly above the press blade 452. Through setting up short circuit detection subassembly 450, can detect the electric connectivity of utmost point ear and battery case fast, guarantee the end quality of welding of battery.
Referring to fig. 10, another embodiment, the diverting assembly 460 includes a diverting groove 461, a recovery bin 462, and a diverting cylinder 463 driving the diverting groove 461 to move in a horizontal direction; the diversion channel 461 is located above the recovery bin 462. Through setting up splitter box 461 and recovery storehouse 462, be convenient for collect the processing unqualified battery and handle, guarantee the yields of battery processing.
Referring to fig. 11, another embodiment, the groove-pressing assembly 500 includes an upper pressing bar 510, a rolling wheel 520, and a lower pressing part 530, the upper pressing bar 510 being connected to a lower pressing cylinder 511, and the lower pressing part 530 being connected to a rolling motor 531. Through setting up depression bar 510 and pushing down portion 530, rolling wheel 520 can carry out quick, stable indent operation to the battery, improves the yields of battery processing.
In another embodiment, the rack 100 is provided with a control button 120 and a display screen 130; the control buttons 120 and the display 130 are electrically connected to the controller 110. Through setting up control button 120 and display screen 130, the production workman of being convenient for can observe the operation situation of present binary channels battery end of welding device directly perceivedly to carry out the aperture adjustment to the battery end of welding device through control button 120, improve the convenience of use of binary channels battery end of welding device.
The working principle of the present invention is further explained below.
In the production process, a battery to be bottomed is placed in the upper tray 150, and an insulating cotton sliver is wound on the insulating pad tray 441. The weld stack 300, test stack 400, and indent stack 500 are activated in sequence by the controller 110. The pushing component 220 drives the battery in the upper tray 150 to open upwards and is sequentially conveyed to the conveying groove 210 and passes through the lower part of the middle hole detection device 160, and the middle hole detection device 160 detects the depth of the middle hole of the battery so as to avoid the situation of blockage of the middle hole of the battery; then, under the driving of the pushing component 220, the copper bars are respectively conveyed to the lower part of the welding assembly 300 along the two conveying grooves 210, the welding pin fixture 310 clamps the copper bars, and the electrode lugs and the battery shell are pressed to the welding head under the driving of the welding cylinder 320, so that the primary battery bottom welding operation is completed; then repeating the above steps of bottom welding to finish the two times of bottom welding operation of the battery; then, the batteries are continuously conveyed to the gathering position along the conveying direction of the conveying groove 210, the feeding sensor 211 is triggered, the feeding cylinder 221 starts to operate, and the batteries with the welded bottoms are pushed to the rotary table 410; under the drive of the turntable 410, the battery passes through a tab positioning assembly 420, a welding spot detection assembly 430, an insulation pad placing assembly 440, a short circuit detection assembly 450 and a shunt assembly 460 in sequence; firstly, the battery is accurately positioned, the positioning probe 421 accurately positions the lug, and the positioning cylinder 424 drives the battery to rotate so that the lug moves to a specified position; then testing the welding spot firmness of the battery, driving the clamp 431 to clamp the tab and press the tab on the baffle 432 by the detection cylinder 433, reading the air pressure value of the detection cylinder 433 by the controller 110, if the air pressure value changes within a preset time, judging that the welding spot firmness is insufficient, defining the battery as a defective product, skipping the subsequent steps, and processing by the to-be-shunted assembly 460; if the air pressure value is not changed within the preset time, defining the battery as a qualified product, and continuing to execute the subsequent steps; then, the position of a pole lug of the battery is accurately positioned again, so that the insulating pad is convenient to place, the stamping part 442 cuts an insulating cotton sliver on the insulating pad material disc 441 into insulating pads with the same shape as the battery, and then the placing cylinder 444 drives the feeding part 443 to place the cut insulating pads in the battery; the shunting groove 461 is driven by the shunting cylinder 463 to push the batteries which are defined as unqualified products to the recovery bin 462; then, the short circuit detection assembly 450 detects the battery, the test arm 451 and the pressing sheet 452 are respectively connected with the tab and the housing of the battery, and the power-on test is continued through the power-on component, if the controller 110 detects that the current of the power-on component does not reach the preset value, namely the tab and the housing have poor connectivity and is defined as a defective product, the turntable 410 rotates reversely, and the battery is pushed to the recovery bin 462; if the current of the energized component reaches a preset value, the turntable 410 continues to transmit the battery to the cell assembly 500; the pressing cylinder 511 drives the upper pressing rod 510 to press the battery on the pressing part 530, the rolling wheel 520 is pressed against the side surface of the battery, and the rolling motor 531 drives the pressing part 530 to drive the battery to rotate to form a pressing groove. Just so accomplish the battery and weld end operation, can see that whole process is high-efficient orderly, and the binary channels sets up the machining efficiency who has guaranteed that the battery welds the end twice, and conveying assembly 200, test assembly 400 cooperate the use, have improved the yields of battery welding end processing.
As can be seen from the above description, the dual-channel battery bottom welding device provided by the invention has the advantages that by arranging the conveying assembly 200 and the welding assembly 300, the dual-channel battery bottom welding device can simultaneously perform bottom welding operation on two batteries and synchronously convey the two batteries forwards through the conveying assembly 200, so that the processing efficiency of battery bottom welding is improved; by arranging the test component 400 and the controller 110, the welded battery is detected, and the yield of battery production is improved; by arranging the feeding disc 150 and the middle hole detection device 160, the running speed of the battery is improved, and the situation that the middle hole of the battery is blocked before bottom welding operation of the battery is also ensured; through setting up material loading cylinder 221 and material loading sensor 211, can control the battery accurately and transmit on transfer tank 210, improve the stability and the conveying efficiency of two-channel battery bottom welding device.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A dual-channel battery bottom welding device is characterized by comprising a rack, a conveying assembly, a welding assembly, a testing assembly and a groove pressing assembly; the conveying assembly comprises a conveying groove and a pushing component, and two welding assemblies are arranged on the conveying groove in parallel; the testing assembly is provided with a turntable, and the outer side of the turntable is sequentially provided with a tab positioning assembly, a welding spot detection assembly, an insulating pad placing assembly, a short circuit detection assembly and a shunt assembly; the shunt assembly is connected with the test assembly and the pressure tank assembly; the welding assembly comprises a welding needle clamp, a welding head and a welding cylinder for driving the welding needle clamp to move in the vertical direction; the rack is provided with a controller, and the conveying assembly, the welding assembly, the testing assembly and the pressure tank assembly are all electrically connected with the controller.
2. The dual-channel battery bottom welding device as claimed in claim 1, wherein an upper tray is connected to one end of the conveying groove, and the other end of the conveying groove is opposite to the turntable; and a middle hole detection device is arranged between the feeding disc and the welding assembly.
3. The dual-channel battery bottom welding device as claimed in claim 2, wherein the pushing component is provided with a feeding cylinder, and the feeding cylinder is located between the welding assembly and the rotating disc; and a feeding sensor is arranged on the conveying groove, and the feeding cylinder is electrically connected with the feeding sensor.
4. The dual-channel battery bottom welding device as claimed in claim 1, wherein the tab positioning assembly comprises a positioning probe, a driving wheel, a driving motor and a positioning cylinder for driving the driving wheel to move in the horizontal direction, and the driving motor drives the driving wheel to rotate.
5. The dual-channel battery bottom welding device as claimed in claim 4, wherein the welding spot detection assembly comprises a clamp, a baffle plate and a detection cylinder for driving the clamp to move in a vertical direction; the clamp is opposite to the baffle.
6. The dual-channel battery bottom-welding device as claimed in claim 1, wherein the insulating pad placing assembly comprises an insulating pad tray, a stamping part, a feeding part and a placing cylinder for driving the feeding part to move.
7. The dual channel battery bottoming device of claim 1, wherein the short circuit detection assembly comprises a test arm, a wafer, and an energized component; the test arm and the pressing sheet are connected with the electrifying component; the press sheet is positioned on the side surface of the turntable, and the test arm extends downwards to the upper part of the press sheet.
8. The dual-channel battery bottom-welding device according to claim 7, wherein the shunt assembly comprises a shunt slot, a recovery bin and a shunt cylinder for driving the shunt slot to move in the horizontal direction; the splitter box is positioned above the recovery bin.
9. The dual-channel battery bottom welding device as claimed in claim 1, wherein the groove pressing assembly comprises an upper pressing rod, a rolling wheel and a lower pressing portion, the upper pressing rod is connected with a lower pressing cylinder, and the lower pressing portion is connected with a rolling motor.
10. The dual-channel battery bottom welding device according to claim 1, wherein a control key and a display screen are arranged on the rack; the control key and the display screen are electrically connected with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110361356.8A CN113231761A (en) | 2021-04-02 | 2021-04-02 | Binary channels battery welds end device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110361356.8A CN113231761A (en) | 2021-04-02 | 2021-04-02 | Binary channels battery welds end device |
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| CN113231761A true CN113231761A (en) | 2021-08-10 |
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| CN202110361356.8A Pending CN113231761A (en) | 2021-04-02 | 2021-04-02 | Binary channels battery welds end device |
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| CN202317354U (en) * | 2011-11-22 | 2012-07-11 | 东莞市善易机械科技有限公司 | Automatic tin soldering machine |
| CN204189849U (en) * | 2014-10-28 | 2015-03-04 | 罗传军 | Insulation cushion device is rushed in the assembling of a kind of cylindrical battery |
| CN204375851U (en) * | 2015-03-04 | 2015-06-03 | 惠州市龙海科技有限公司 | A kind of cylindrical battery assembling all-in-one |
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| CN111463491A (en) * | 2020-04-01 | 2020-07-28 | 潘丽君 | Cylindrical lithium battery production equipment and method |
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