CN112975176A - Novel laser welding plane pressure head - Google Patents
Novel laser welding plane pressure head Download PDFInfo
- Publication number
- CN112975176A CN112975176A CN202110253304.9A CN202110253304A CN112975176A CN 112975176 A CN112975176 A CN 112975176A CN 202110253304 A CN202110253304 A CN 202110253304A CN 112975176 A CN112975176 A CN 112975176A
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- China
- Prior art keywords
- guide channel
- flow guide
- pressure head
- welding
- laser
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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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary 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
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a novel laser welding plane pressure head, which comprises a pressure head body, wherein a laser flow guide channel is arranged on the pressure head body; the first flow guide channel is communicated with the laser flow guide channel and is used for introducing inert gas; the second flow guide channel is communicated with the laser flow guide channel and is used for discharging inert gas and welding slag; the first flow guide channel and the second flow guide channel are communicated with the outside. Aiming at the technical problems of insufficient welding, over-welding, heating, explosion, cracking, burrs and oxidation easily caused by laser welding, the invention provides a novel laser welding plane pressure head which can effectively avoid the phenomena of insufficient welding, over-welding, heating, explosion, cracking, burrs and oxidation of a battery connecting piece, effectively avoid the problems of battery diaphragm shrinkage, tab sealing ring aging, battery cell leakage and the like, and improve the welding yield of PACK connecting pieces and cover plate connecting pieces and the safety of batteries.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a novel laser welding plane pressure head.
Background
No matter the current lithium battery factory is matched with a whole vehicle factory, a communication base station, an energy storage station or for civil use, the battery cores are combined into a group, the related battery cores are connected in series and parallel through a busbar and a flexible connection, and a power battery pack is formed through protection and PDU control through battery hardware systems such as heat management. The process of assembling the battery cells into a group is called PACK, and the battery cells can be single batteries or series-parallel battery modules and the like. Under the large background of the current new national standard, the demand of lithium batteries is increasingly large, and many lead-acid battery enterprises also push out lithium battery products; the lithium battery PACK process plays a role in power battery PACK, and the battery cell serial-parallel mode in the PACK process is commonly used in the prior industry by ultrasonic welding, laser welding, tin wire welding and other processes.
In addition, the battery cell comprises main components such as a cover plate, an aluminum shell, a dry battery cell, electrolyte and the like, wherein the cover plate is provided with positive and negative poles, the main purpose is connected with the positive and negative poles of the dry battery cell, and the cover plate is also used for connecting an external circuit.
The industrial power battery pack is particularly matched with a power market, two connecting sheets with different purposes are basically welded by laser in consideration of whether overcurrent and battery pack performance parameters are not disordered or whether the connecting sheets are connected with pole columns or connected in series and parallel with batteries, the current main problems of laser welding are insufficient welding, over welding, heating, fire explosion, cracking, burrs, oxidation and the like, the problems of battery internal diaphragm shrinkage, pole lug sealing ring aging, battery cell leakage and the like are also connected by laser welding, and the problem that the laser welding is the first step of a battery pack and is also an irreplaceable step is solved;
in addition, in the process of laser welding the connecting sheet, due to the problems of position insufficient welding, over welding, heating, fire explosion, cracking, burrs, oxidation and the like, the electric quantity of the power battery pack is directly influenced, the phenomena of overcurrent, short circuit, open circuit, breakdown, ignition and the like are also directly influenced, or the phenomena of battery cell diaphragm shrinkage, tab sealing ring aging, battery cell leakage, short circuit in the battery cell, ignition of the battery cell and the like are caused due to the laser welding of the connecting sheet, and potential safety hazards of the battery exist.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the technical problems of insufficient welding, over-welding, heating, explosion, cracking, burrs and oxidation easily caused by laser welding, the invention provides a novel laser welding plane pressure head which can effectively avoid the phenomena of insufficient welding, over-welding, heating, explosion, cracking, burrs and oxidation of a battery connecting piece, effectively avoid the problems of battery diaphragm shrinkage, tab sealing ring aging, battery cell leakage and the like, and improve the welding yield of PACK connecting pieces and cover plate connecting pieces and the safety of batteries.
2. Technical scheme
In order to solve the problems, the technical scheme provided by the invention is as follows:
a novel laser welding plane pressure head comprises a pressure head body, wherein a laser flow guide channel is arranged on the pressure head body; the first flow guide channel is communicated with the laser flow guide channel and is used for introducing inert gas; the second flow guide channel is communicated with the laser flow guide channel and is used for discharging inert gas and welding slag; the first flow guide channel and the second flow guide channel are communicated with the outside.
Optionally, the first flow guide channel and the second flow guide channel are respectively located on two sides of the laser flow guide channel and arranged in opposite directions.
Optionally, the first flow guide channel is in a flat drum shape, or a round shape or a square shape.
Optionally, two or more laser diversion channels are arranged on the pressure head body, and the number of the first diversion channels and the number of the second diversion channels correspond to that of the laser diversion channels.
Optionally, the pressure head body includes pressure head main part and direction main part, be equipped with pressure mouth in the pressure head main part, laser water conservancy diversion passageway pierces through the pressure mouth.
Optionally, the pressure head main body and the guide main body are movably connected through a guide bolt, and a telescopic spring is sleeved on the guide bolt.
Optionally, the second flow guide channel is a channel formed by spacing the pressure head main body and the guide main body.
Optionally, the pressure nozzle is square or round, oval or polygonal.
Optionally, the first flow guide channel is arranged obliquely towards the middle of the pressure nozzle.
Optionally, a plurality of guide holes are formed in the pressure head main body.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) this novel laser welding plane pressure head can effectively avoid battery connection piece rosin joint, overweld, generate heat, explode fire, explosion point, the phenomenon of rupture, burr, oxidation, also effectively avoids battery diaphragm shrink, the ageing, electric core weeping scheduling problem of utmost point ear sealing washer, improves PACK connection piece welding and cover plate connection piece welding yield and battery security.
Drawings
Fig. 1 is a schematic structural diagram of a novel laser welding planar indenter according to an embodiment of the present invention;
FIG. 2 is a first schematic cross-sectional view of a novel laser welding planar indenter according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a novel laser welding planar indenter according to an embodiment of the present invention.
1. A ram body; 11. a ram body; 12. a guide body; 2. a laser flow guide channel; 3. a first flow guide passage; 4. a second flow guide channel; 5. pressing a nozzle; 6. a guide bolt; 7. a tension spring; 8. and (4) a guide hole.
Detailed Description
For a further understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings 1-3.
With reference to fig. 1-3, the novel laser welding planar pressure head of the present embodiment includes a pressure head body 1, wherein a laser flow guide channel 2 is disposed on the pressure head body 1; the first flow guide channel 3 is communicated with the laser flow guide channel 2 and is used for introducing inert gas; the second flow guide channel 4 is communicated with the laser flow guide channel 2 and is used for discharging inert gas and welding slag; the first flow guide channel 3 and the second flow guide channel 4 are both communicated with the outside.
During welding, inert gas enters the laser flow guide channel 2 from the first flow guide channel 3, and directly plays a role in cooling and radiating the welding surface, so that oxidation is prevented, over-welding is avoided, the laser welding temperature is improved, further, the contraction of a battery core diaphragm is prevented, the phenomena of tab sealing ring aging, battery core leakage and the like are effectively avoided, and the welding yield and the battery safety are improved; the external dust remover adsorbs gas, smoke and dust in the welding process and welds through the second diversion channel 4, so that the phenomena of fire explosion, explosion points, breakage and burrs are avoided, the welding effect of the connecting strip or the connecting sheet and the pole is improved, the welding quality is improved, the problems of the burrs, the explosion points and the breakage caused by the generation are effectively avoided, and the welding yield and the safety of the battery are improved; wherein, laser water conservancy diversion passageway 2 plays and keeps away laser, has also played the effect of restriction laser welding size.
As an alternative of the present invention, the first flow guide channel 3 and the second flow guide channel 4 are respectively located on two sides of the laser flow guide channel 2 and are oppositely arranged, and the first flow guide channel 3 and the second flow guide channel 4 are oppositely arranged, so that after the inert gas enters the laser flow guide channel 2 from the first flow guide channel 3 on one side, the inert gas in the original laser flow guide channel 2 can be discharged from the second flow guide channel 4 on the other side, the gas flow is in a direct flow state when flowing through the first flow guide channel 3, the laser flow guide channel 2 and the second flow guide channel 4, the flow direction is not changed, the flow speed of the inert gas is ensured, and the gas flow can take out welding slag generated by welding as much as possible.
As an alternative of the present invention, the first diversion channel 3 is in a flat drum shape or a round or square shape.
As an alternative of the invention, two or more laser guide channels 2 are arranged on the pressure head body 1, the number of the first guide channels 3 and the second guide channels 4 corresponds to that of the laser guide channels 2, each laser guide channel 2 is matched with one first guide channel 3 and one second guide channel 4, so as to ensure that the inert gas is not reused, and the design of the plurality of laser guide channels 2 can realize simultaneous welding at a plurality of positions, thereby improving the welding efficiency.
As an alternative of the present invention, the pressure head body 1 includes a pressure head main body 11 and a guide main body 12, the pressure head main body 11 is provided with a pressure nozzle 5, the pressure nozzle 5 is a protrusion protruding from the surface of the pressure head main body 11, the pressure nozzle is square, circular, elliptical or polygonal and is used for pressing and connecting an object to be welded, and the laser guide channel 2 penetrates through the pressure nozzle 5 so that laser can penetrate through the pressure nozzle 5 to weld the battery cover plate and the dry cell connection sheet.
As an alternative of the invention, the pressure head main body 11 and the guide main body 12 are movably connected through a guide bolt 6, the guide bolt 6 is provided with a threaded connection section and a sliding section, the guide bolt 6 penetrates through the pressure head main body 11 and is fixedly connected with the guide main body 12, the pressure head main body 11 can relatively slide in the range of the sliding section, the guide bolt 6 is sleeved with a telescopic spring 7, the telescopic spring 7 is always in a compressed state between the pressure head main body 11 and the guide main body 1, the guide bolt 6 plays a pre-tightening and length fixing role in the tightening process, the distance between the fixed pressure head main body 11 and the guide main body 12 is ensured to be larger than 2mm, and when the laser welding plane pressure head compresses a welding object, the telescopic spring 7 has no telescopic distance, and the spring is also prevented from reaching the. The welding objects are pressed by the pretightening force of the expansion spring 7, so that the welding objects are ensured to be fully contacted with the welded objects, and the phenomena of insufficient welding, fire explosion, explosion point and the like are avoided.
As an alternative of the present invention, the second diversion channel 4 is a channel formed by the indenter body 11 and the guide body 12 at an interval, and the second diversion channel 4 is designed to have a larger diameter so as to facilitate the passage of the welding slag, and if the second diversion channel 4 is separately provided on the indenter body 11 or the guide body 12 and needs to be designed to have a larger diameter, the overall strength of the indenter body 1 is easily affected.
As an alternative of the present invention, the first flow guide channel 3 is obliquely arranged toward the middle of the pressure nozzle 5, so that the inert gas introduced from the first flow guide channel 3 is directly sprayed onto the welding surface to improve the effect of cooling and heat dissipation, and the welding in the welding surface is timely impacted and carried out by the air flow.
As an alternative of the invention, a plurality of guide holes 8 are arranged on the pressure head main body 11, the opening at the lower end of each guide hole 8 is in a flaring shape, and the flaring-shaped guide holes 8 have certain deviation rectifying capability, so that collision between the guide rod and the pressure head main body 11 can be effectively prevented.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. The utility model provides a novel laser welding plane pressure head which characterized in that: comprises a pressure head body, wherein the pressure head body is provided with
A laser flow guide channel;
the first flow guide channel is communicated with the laser flow guide channel and is used for introducing inert gas;
the second flow guide channel is communicated with the laser flow guide channel and is used for discharging inert gas and welding slag;
the first flow guide channel and the second flow guide channel are communicated with the outside.
2. A novel laser welding flat indenter as claimed in claim 1, wherein: the first flow guide channel and the second flow guide channel are respectively positioned on two sides of the laser flow guide channel and are arranged oppositely.
3. A novel laser welding flat indenter as claimed in claim 1, wherein: the first flow guide channel is in a flat drum shape or a round or square shape.
4. A novel laser welding flat indenter as claimed in claim 1, wherein: the pressure head body is provided with two or more laser diversion channels, and the number of the first diversion channels and the number of the second diversion channels correspond to that of the laser diversion channels.
5. A new laser welding flat indenter as claimed in any of claims 1-4, characterized in that: the pressure head body comprises a pressure head main body and a guide main body, a pressure nozzle is arranged on the pressure head main body, and the laser flow guide channel penetrates through the pressure nozzle.
6. A novel laser welding flat indenter as claimed in claim 5, wherein: the pressure head main part and the guide main part are movably connected through a guide bolt, and a telescopic spring is sleeved on the guide bolt.
7. A novel laser welding flat indenter as claimed in claim 5, wherein: the second flow guide channel is a channel formed by the pressure head main body and the guide main body at intervals.
8. A novel laser welding flat indenter as claimed in claim 5, wherein: the pressure nozzle is square or round, oval or polygonal.
9. A novel laser welding flat indenter as claimed in claim 5, wherein: the first flow guide channel is obliquely arranged towards the middle of the pressure nozzle.
10. A novel laser welding flat indenter as claimed in claim 5, wherein: the pressure head main part is provided with a plurality of guide holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253304.9A CN112975176A (en) | 2021-03-05 | 2021-03-05 | Novel laser welding plane pressure head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253304.9A CN112975176A (en) | 2021-03-05 | 2021-03-05 | Novel laser welding plane pressure head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112975176A true CN112975176A (en) | 2021-06-18 |
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ID=76335665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110253304.9A Pending CN112975176A (en) | 2021-03-05 | 2021-03-05 | Novel laser welding plane pressure head |
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| Country | Link |
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| CN (1) | CN112975176A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024066239A1 (en) * | 2022-09-27 | 2024-04-04 | 宁德时代新能源科技股份有限公司 | Soldering positioning device |
-
2021
- 2021-03-05 CN CN202110253304.9A patent/CN112975176A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024066239A1 (en) * | 2022-09-27 | 2024-04-04 | 宁德时代新能源科技股份有限公司 | Soldering positioning device |
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