CN215316333U - Laser welding system for hermetically welding cell top cover - Google Patents
Laser welding system for hermetically welding cell top cover Download PDFInfo
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- CN215316333U CN215316333U CN202120180161.9U CN202120180161U CN215316333U CN 215316333 U CN215316333 U CN 215316333U CN 202120180161 U CN202120180161 U CN 202120180161U CN 215316333 U CN215316333 U CN 215316333U
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Abstract
The utility model relates to the field of welding of cell top covers, in particular to a laser welding system (1) for hermetically welding a cell top cover (2), wherein the laser welding system (1) comprises: the laser emitting device (11) is used for generating a scanning welding laser beam which irradiates a part to be welded of the cell top cover (2); and a control device (12) for controlling at least the laser emission device (11) to perform a continuous scanning sealing welding of the cell caps (2), wherein the laser welding system (1) is configured to perform the sealing welding of the cell caps (2) in only one station. According to some embodiments of the utility model, the welding speed, the welding quality and the automation level of the cell top cover can be improved.
Description
Technical Field
The utility model relates to a laser welding system for hermetically welding a cell top cover.
Background
With the advancement of technology and increasingly stringent environmental requirements, more and more devices are beginning to use batteries as a power source. For example, electric vehicles have been developed in recent years, and there is a tendency to gradually replace conventional vehicles.
The battery cores serving as the minimum composition units of the power battery can form a module, and the module can form a battery pack. The cells are electrical energy storage units and must have a high energy density in order to store as much electrical energy as possible. The service life of the battery cell is also the most critical factor, and damage to any one battery cell may cause damage to the whole battery pack.
The manufacturing method of the battery cell not only relates to the quality of the battery cell, but also determines the manufacturing efficiency. The battery pack generally includes a plurality of battery cells, and therefore, it is important to select an efficient manufacturing method.
During the manufacturing process of the battery cell, the sealing welding of the top cover of the battery cell is very important. The existing continuous seal welding step (i.e. the main welding step) of the cell top cover seal welding mainly adopts a solid-state welding head (also called a collimation welding head or a collimation emission head) which is carried on a linear motor and performs welding in a closed shape (usually a closed rectangle) around the cell top cover. When closed rectangular, there are typically 4 small rounded corners.
The main disadvantage of such welding is that the welding speed is limited by the acceleration and deceleration of the motor. In particular, the motor needs to decelerate near the corners and accelerate away from the corners, which can affect the welding speed. The welding speed of the welding mode is generally not more than 250 mm/s. On the other hand, such acceleration and deceleration makes the weld penetration in the weld region, particularly in the deceleration region (particularly in the corner region), inconsistent.
In addition, in the prior art, the welding of the top cover of the battery core is not performed with visual positioning before welding, the penetration monitoring is not performed during welding, the surface quality monitoring is not performed after welding, and all the effects on the welding quality and the yield are also influenced.
Furthermore, in the existing welding technology, the seal welding includes a laser pre-welding step, particularly spot welding, in addition to the above-described continuous seal welding step, the pre-welding step needs to be performed at a station before the continuous seal welding, and then the pre-welded cell top cover is transported to the continuous seal welding station for the continuous seal welding. Therefore, the equipment investment is increased, the occupied area is also increased, and meanwhile, the welding system is complex.
For this reason, corresponding improvements are required.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide an improved laser welding system for hermetically welding cell caps that overcomes at least one of the above-mentioned disadvantages.
According to one aspect of the present invention, there is provided a laser welding system for seal welding a cell cap, the laser welding system comprising: the laser emitting device is used for generating a scanning welding laser beam irradiating the part to be welded of the top cover of the battery cell; and at least a control device for controlling the laser emitting device to perform continuous scanning sealing welding on the cell top cover, wherein the laser welding system is configured to complete the sealing welding on the cell top cover only at one station.
According to an exemplary embodiment of the present invention, the laser emitting device is configured to operate based on a ring core tunable welding (BLW) technique. The adjustable welding technique of the ring core can be specifically referred to the content disclosed in the Chinese patent publication CN 109982807A, which is incorporated by reference in its entirety.
According to an exemplary embodiment of the utility model, the laser welding system is configured for continuously performing a loop of welding on the cell cap; and/or the laser welding system is configured to weld at a scan welding speed of up to 10000 mm/s.
According to an exemplary embodiment of the utility model, the laser welding system further comprises one or more of: positioning means for at least pre-positioning before welding; the in-welding penetration monitoring device is used for monitoring the depth of a molten pool in the continuous scanning sealing welding process; and a post-weld surface quality monitoring device for monitoring the quality of the welded surface.
According to an exemplary embodiment of the utility model, the positioning device is configured as a first vision device; and/or the positioning device is configured for customized programming based on sample size configuration; and/or the positioning device is in communication connection with a control device; and/or the positioning device is in communication connection with the laser emitting device.
According to an exemplary embodiment of the utility model, the positioning device is configured and adapted to acquire characteristic data of the cell cover in connection with a subsequent continuous scan sealing welding operation and to transmit the characteristic data to the control device, and the control device is configured and adapted to control the laser emitting device and/or the table for fixing the cell cover based on the acquired characteristic data.
According to an exemplary embodiment of the present invention, the characteristic data includes at least one of a geometric characteristic of the cell top cover, a positional characteristic of the cell top cover, and a gap characteristic of a to-be-welded portion; and/or the laser welding system is configured to: and executing subsequent continuous scanning sealing welding under the condition that the characteristic data meet the preset conditions, and terminating the continuous scanning sealing welding or continuously executing the subsequent continuous scanning sealing welding by adjusting the cell top cover to meet the preset conditions under the condition that the characteristic data do not meet the preset conditions.
According to an exemplary embodiment of the present invention, the laser welding system is configured to adjust a characteristic of a laser beam emitted by a laser emitting device based on a gap width characteristic and/or a gap position characteristic of the site to be welded; and/or the laser emitting device has a controller or the control device is integrated with the laser emitting device; and/or the laser emitting device is configured as a scanning galvanometer.
According to an exemplary embodiment of the utility model, the in-weld penetration monitoring device is configured to operate based on an optical coherence tomography technique; and/or the in-welding penetration monitoring device is in communication connection with the control device; and/or the post-weld surface quality monitoring device is configured to determine whether the corresponding cell top cover is a qualified product based on a comparison result with a predetermined surface quality; and/or the post-weld surface quality monitoring device is configured as a second vision device; and/or the post-weld surface quality monitoring device is in communication with the control device.
According to an exemplary embodiment of the utility model, the positioning device and the post-weld surface quality monitoring device are configured as the same vision device.
According to some embodiments of the utility model, the welding speed, the welding quality and the automation level of the cell top cover can be improved, the occupied area is reduced, and the laser welding system is simplified.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the utility model in more detail below with reference to the accompanying drawings. The drawings comprise:
fig. 1 shows a schematic block diagram of a laser welding system for continuous scan sealing welding of cell caps according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the scope of the utility model.
Fig. 1 shows a schematic block diagram of a laser welding system for continuous scan sealing welding of cell caps according to an exemplary embodiment of the present invention.
As shown in fig. 1, the laser welding system 1 may include: a laser emitting device 11 for generating a scanning welding laser beam, and a control device 12 for controlling at least the laser emitting device 11 to perform continuous scanning sealing welding on the cell top cover 2. During the welding process, the cell cover 2 may be fixed to the table 3. The cell top cover 2 is typically made of aluminum, aluminum alloy, stainless steel, or the like, and is suitable for laser welding. The table 3 may be a jig.
The person skilled in the art will understand that the table 3 can also be controlled by the control device 12, for example, in order to adjust the position and/or orientation of the cell cover 2, in particular its position and/or orientation relative to the laser emitting device 11.
It will be appreciated by those skilled in the art that the laser welding system 1 according to the present invention may be fixed as a whole during the seal welding process, and only rely on the laser emitting device 11, e.g., the optical device 111 thereof, to control the position of the laser beam irradiated onto the cell top cover 2, so that a circle can be continuously welded around the cell top cover 2. In this case, the problem of acceleration and deceleration of the linear motor in the traditional sealing welding process does not exist, and the welding speed can be greatly improved, for example, the scanning welding speed can reach 10000 mm/s.
According to an exemplary embodiment of the present invention, laser emitting device 11 may be configured to operate based on a ring-core tunable welding technique. The adjustable welding technology of the ring core belongs to the technology of the applicant, and the two-in-one laser optical cable (LLK) is used for emitting laser beams to a workpiece to be processed, so that the adjustable welding technology has the advantages of reducing splashing, improving surface forming and the like. For clarity, specific details are not set forth herein.
According to an exemplary embodiment of the present invention, the laser welding system 1 may further comprise positioning means 13 at least for pre-welding pre-positioning, in order to enable the laser beam to be moved/scanned in a predetermined manner relative to the cell top cover 2, in particular to enable the incident position of the laser beam to be adjusted in real time depending on the position of the cell top cover 2 to avoid damaging the workpiece or the work table 3.
According to an exemplary embodiment of the present invention, the positioning device 13 may be configured as a vision device. In this case, the shape/contour of the cell cover 2 can be automatically acquired, for example, by means of intelligent image processing technology, and the corresponding laser incidence position can be adjusted.
According to an exemplary embodiment of the present invention, the positioning device 13 may be configured to allow customized programming based on the sample size configuration for pre-weld pre-positioning.
As shown in fig. 1, the positioning device 13 (especially in the case of a vision device) may communicate with the control device 12 (schematically shown in fig. 1 by a dotted line) to feed back the acquired shape and position of the cell top cover 2, the characteristics of the gap at the to-be-welded portion (including but not limited to the width of the gap, the position of the gap, whether the gap is uniform, etc.), and the like, to the control device 12. The control device 12 can control the laser emitting device 11 and even the stage 3 according to the information.
According to an exemplary embodiment of the present invention, when the gap width is greater than a predetermined value, the control device 12 may issue an alarm to notify the operator that the cell top cover 2, which is being sealed and welded, cannot be subsequently welded, otherwise a welding problem may occur. At this time, the staff can adjust or remove the cell top cover 2, thereby avoiding cost loss and improving yield.
It will be understood by those skilled in the art that it is also contemplated to automatically adjust the cell cover 2 so that the gap at the portion to be welded meets a predetermined condition and then welding can continue.
According to an exemplary embodiment of the present invention, the positioning device 13 may also communicate with the laser emitting device 11 to control the laser emitting device 11 by means of a controller (not shown) in case the laser emitting device 11 itself has the controller.
The controller of the laser emitting device 11 itself can also be considered as part of said control device 12. Even in some cases, the control device 12 may be integrated with the laser emitting device 11, for example, in the case of a scanning galvanometer (PFO). The utility model is not limited in this regard.
According to an exemplary embodiment of the present invention, the characteristics of the laser beam emitted by the laser emitting device 11, such as power, focal spot size, etc., may be controlled, preferably automatically, according to the characteristics of the gap at the portion to be welded, such as the gap width. This greatly improves the level of automation and can improve yield.
According to an exemplary embodiment of the present invention, the laser welding system 1 may further include an in-weld penetration monitoring device 14 for monitoring a depth of a weld pool during continuous scan sealing welding. The weld state can be monitored in real time by means of this penetration monitoring device 14, and the operation of the laser emitting device 11 can be controlled, in particular by means of the control device 12, as required to achieve the desired welding process.
According to an exemplary embodiment of the present invention, the penetration monitoring device 14 may be configured to operate based on optical coherence tomography. In this case, the depth of the molten pool can be monitored in real time by tomography to determine whether to weld in a desired manner.
According to an exemplary embodiment of the present invention, the laser welding system 1 may further include a post-weld surface quality monitoring device 15 for monitoring the quality of the welded surface.
According to an exemplary embodiment of the present invention, the post-weld surface quality monitoring device 15 may be configured as a vision device, such as a camera. In this case, it is possible to judge whether the welded surface is a good product or not based on the comparison result by photographing the welded surface and then comparing it with the weld surface in the database, for example. If the non-qualified product is judged to be non-qualified product, an operator can be informed or the non-qualified product can be automatically removed through a corresponding device.
According to an exemplary embodiment of the present invention, the post-weld surface quality monitoring device 15 may be configured to be the same as the positioning device 13, or the same device. In the latter case, it means that the positioning device 13 can either be pre-positioned before welding or quality-monitored on the rear surface after welding. In this way, not only the complexity of the laser welding system 1 can be reduced, but also the cost can be reduced.
The laser welding system according to the utility model can also be used to pre-weld the cell cover 2 before the continuous scan seal welding. In other words, the same laser welding system can be used for both pre-welding and subsequent continuous scan seal welding without changing stations. Prewelding may be considered as a step of seal welding.
It will also be appreciated by those skilled in the art that the continuous scan seal welding can be performed even without the pre-welding process, particularly if the fixture is capable of reliably securing the top cover.
Although specific embodiments of the utility model have been described herein in detail, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the utility model. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention.
Claims (10)
1. A laser welding system (1) for seal welding of cell caps (2), characterized in that the laser welding system (1) comprises:
the laser emitting device (11) is used for generating a scanning welding laser beam which irradiates a part to be welded of the cell top cover (2); and
a control device (12) at least used for controlling the laser emission device (11) to carry out continuous scanning sealing welding on the cell top cover (2),
wherein the laser welding system (1) is configured to complete the sealing welding of the cell top cover (2) in only one station.
2. The laser welding system (1) according to claim 1, characterized in that the laser emitting device (11) is configured to operate based on a ring-core adjustable welding technique.
3. Laser welding system (1) according to claim 1 or 2,
the laser welding system (1) is configured for continuously performing a round of welding on a cell top cover (2); and/or
The laser welding system (1) is configured to weld at a scan welding speed of up to 10000 mm/s.
4. The laser welding system (1) according to claim 1, characterized in that the laser welding system (1) further comprises one or more of the following:
positioning means (13) for at least pre-welding positioning;
an in-weld penetration monitoring device (14) for monitoring the depth of the molten pool during continuous scanning seal welding; and
a post-weld surface quality monitoring device (15) for monitoring the quality of the welded surface.
5. The laser welding system (1) according to claim 4,
the positioning device (13) is configured as a first vision device; and/or
The positioning device (13) is configured to be suitable for customized programming based on sample size configuration; and/or
The positioning device (13) is in communication connection with the control device (12); and/or
The positioning device (13) is in communication connection with the laser emitting device (11).
6. The laser welding system (1) according to claim 5,
the positioning device (13) is configured and adapted to acquire characteristic data of the cell cover (2) relating to a subsequent continuous scanning sealing welding operation and to transmit the characteristic data to the control device (12), the control device (12) being configured and adapted to control the laser emitting device (11) and/or the work table (3) for fixing the cell cover (2) based on the acquired characteristic data.
7. The laser welding system (1) according to claim 6,
the characteristic data comprises at least one of geometric characteristics of the cell top cover (2), position characteristics of the cell top cover (2) and gap characteristics of a part to be welded; and/or
The laser welding system (1) is configured to: and executing subsequent continuous scanning sealing welding under the condition that the characteristic data meet the preset conditions, and terminating the continuous scanning sealing welding or continuously executing the subsequent continuous scanning sealing welding by adjusting the cell top cover (2) to meet the preset conditions under the condition that the characteristic data do not meet the preset conditions.
8. The laser welding system (1) according to claim 7,
the laser welding system (1) is configured to adjust the characteristics of a laser beam emitted by a laser emitting device (11) based on the characteristics of the gap width and/or the gap position of the part to be welded; and/or
The laser emitting device (11) has a controller or the control device (12) is integrated with the laser emitting device (11); and/or
The laser emitting device (11) is configured as a scanning galvanometer.
9. Laser welding system (1) according to any one of claims 4 to 8,
the in-weld penetration monitoring device (14) is configured to operate based on optical coherence tomography; and/or
The in-welding penetration monitoring device (14) is in communication connection with the control device (12); and/or
The post-weld surface quality monitoring device (15) is configured to determine whether the corresponding cell top cover (2) is a qualified product based on a comparison result with a predetermined surface quality; and/or
The post-weld surface quality monitoring device (15) is configured as a second vision device; and/or
The post-welding surface quality monitoring device (15) is in communication connection with the control device (12).
10. Laser welding system (1) according to claim 9,
the positioning device (13) and the post-weld surface quality monitoring device (15) are configured as the same vision device.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120180161.9U CN215316333U (en) | 2021-01-22 | 2021-01-22 | Laser welding system for hermetically welding cell top cover |
| KR1020237028326A KR20230130133A (en) | 2021-01-22 | 2022-01-24 | Laser welding system and method for hermetically welding a cell top cover |
| PCT/CN2022/073483 WO2022156800A1 (en) | 2021-01-22 | 2022-01-24 | Laser welding system for sealingly welding a cell top cover and corresponding method |
| EP22703877.5A EP4281242A1 (en) | 2021-01-22 | 2022-01-24 | Laser welding system for sealingly welding a cell top cover and corresponding method |
| JP2023544449A JP2024505858A (en) | 2021-01-22 | 2022-01-24 | Laser welding system for seal welding cell top lids and corresponding methods |
| US18/356,248 US20230364711A1 (en) | 2021-01-22 | 2023-07-21 | Laser welding system for sealingly welding a cell top cover and corresponding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120180161.9U CN215316333U (en) | 2021-01-22 | 2021-01-22 | Laser welding system for hermetically welding cell top cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215316333U true CN215316333U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120180161.9U Active CN215316333U (en) | 2021-01-22 | 2021-01-22 | Laser welding system for hermetically welding cell top cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215316333U (en) |
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2021
- 2021-01-22 CN CN202120180161.9U patent/CN215316333U/en active Active
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