CN217965304U

CN217965304U - Device for welding battery cell and current collecting plate

Info

Publication number: CN217965304U
Application number: CN202221392762.7U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Pioneer Huineng Technology Co ltd
Current assignee: Shanghai Pioneer Huineng Technology Co ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-12-06
Anticipated expiration: 2032-06-06

Abstract

The utility model relates to a be used for electric core and current collector welded device, the device include welding jig, laser welding mechanism and detection mechanism, and laser welding mechanism includes laser generator and shakes the mirror. The laser welding mechanism welds the current collecting disc on the electric core, and the detection mechanism can acquire the penetration information of the welding seam in real time. The penetration information of the welding seam can reflect the quality of the welding seam, and whether the welded battery core is qualified or not can be judged by analyzing the penetration information. Therefore, welding of the battery core and detection of welding quality can be almost simultaneously carried out, so that a detection procedure is not required to be additionally arranged after welding, time required for welding the battery core and the current collecting disc is effectively shortened, and production efficiency of the battery can be improved.

Description

Device for welding battery cell and current collecting disc

Technical Field

The utility model relates to a lithium battery equipment technical field, in particular to be used for electric core and current collector welded device.

Background

The power battery of the electric automobile mainly uses a cylindrical battery at present, and laser welding is often involved in the production process of the cylindrical battery, for example, before a battery cell is placed into a shell, tabs at two ends and a current collecting disc need to be welded by laser penetration welding respectively. As a large-sized cylindrical battery which is a development trend, for example, a 4680 battery generally adopts a full-tab structure, which is different from a spot welding manner adopted by a conventional single-tab or multi-tab structure, and a battery core of the full-tab structure needs to be subjected to surface welding by using continuous laser.

The welding process and the welding amount of the surface welding are obviously increased compared with the spot welding, and the laser intensity and the focal length are more difficult to control, so that weak welding, insufficient welding or penetration of the welding into the battery cell is easy to occur, and a joint welding quality detection process is generally needed after the laser welding process. The existing welding quality detection is generally carried out by means of optical imaging, X-ray scanning, tension testing and the like after welding, the detection consumes a long time, and the requirement of the production efficiency of a battery cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an apparatus for welding a battery core and a current collecting plate, which can improve the production efficiency of a battery.

An apparatus for welding a cell to a current collector, comprising:

the welding jig can position and clamp the electric core to be welded, and can tightly press the current collecting discs at two ends of the electric core;

the laser welding mechanism comprises a laser generator and a vibrating mirror, welding laser emitted by the laser generator can be shot to a current collecting disc tightly pressed on the battery cell through the vibrating mirror so as to weld the battery cell, and a welding seam for welding the current collecting disc to the battery cell can be formed by the laser welding mechanism; and

and the detection mechanism can acquire the penetration information of the welding seam in real time.

In one embodiment, the welding jig comprises a rotating mechanism, and the rotating mechanism can drive the clamped battery core to rotate around the axis.

In one embodiment, the two laser welding mechanisms are arranged oppositely, the battery cell clamped on the welding jig is located between the two laser welding mechanisms, and the two laser welding mechanisms can respectively weld two ends of the battery cell.

In one embodiment, the laser generator is shared by two of the laser welding mechanisms.

In one embodiment, the detection mechanism can emit detection light and can receive reflected light formed by reflecting the detection light through the welding seam, and the detection mechanism can acquire the penetration information in real time according to the detection light and the reflected light.

In one embodiment, the detection mechanism can move synchronously with the welding track of the laser welding mechanism to acquire the penetration information of the welding seam in real time.

In one embodiment, the battery pack further comprises a screening mechanism, and the screening mechanism can remove the battery cells detected as being unqualified.

In one embodiment, the welding device further comprises a conveying mechanism, wherein the conveying mechanism can convey the battery core to be welded to the welding jig and remove the battery core from the welding jig.

In one embodiment, the conveying mechanism includes a conveyor belt and a clamping assembly, the conveyor belt is used for carrying and conveying the battery core, and the clamping assembly can fix the battery core to the conveyor belt.

In one embodiment, the conveying mechanism further comprises a loading assembly, the loading assembly comprises a loading platform, guide wheels and roller conveying lines, the roller conveying lines extend from the loading platform to the conveying belt, and the guide wheels are arranged on two sides of the roller conveying lines.

According to the device for welding the battery cell and the current collecting disc, the laser welding mechanism welds the current collecting disc on the battery cell, and meanwhile, the detection mechanism can acquire the fusion depth information of a welding seam in real time. The weld penetration information can reflect the quality of the weld, and whether the welded battery core is qualified or not can be judged by analyzing the weld penetration information. Therefore, welding of the battery core and detection of welding quality can be almost simultaneously carried out, so that a detection procedure is not required to be additionally arranged after welding, time required for welding the battery core and the current collecting disc is effectively shortened, and production efficiency of the battery can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of an apparatus for welding an electrical core to a current collector in an embodiment of the present invention;

fig. 2 is a schematic structural view of an assembly of a battery cell and a current collecting plate;

fig. 3 is an end view of a cell after welding to a manifold.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, an apparatus 100 for welding a battery cell and a current collecting plate according to an embodiment of the present invention includes a welding fixture 110, a laser welding mechanism 120, and a detection mechanism 130.

The welding jig 110 can position and clamp the battery cell 210 to be welded, and can press the current collecting discs 220 against two ends of the battery cell 210. The laser welding mechanism 120 is configured to perform laser penetration welding on two ends of the battery cell 210, so as to weld the current collecting plates 220 pressed against the two ends of the battery cell 210 to the battery cell 210, thereby obtaining the structure shown in fig. 2. The current collecting plate 220 includes an anode current collecting plate and a cathode current collecting plate, the anode current collecting plate is generally made of aluminum, the cathode current collecting plate is generally made of copper, and the anode current collecting plate and the cathode current collecting plate are respectively pressed on two ends of the battery cell 210.

The welding jig 110 generally includes a carrier, a positioning assembly, and a feeding assembly, where the carrier is used to support the battery cell 210 to be welded, the positioning assembly is used to position and clamp the battery cell 210, and the feeding assembly is used to continuously provide the current collecting discs 220 and press the current collecting discs 220 against two ends of the battery cell 210 on the welding jig 110. The positioning assembly can adopt a mode that the clamping blocks are matched with the air cylinder, and under the driving of the air cylinder, the two clamping blocks can be close to each other to position and clamp the battery cell 210.

The battery cell 210 is formed by winding a negative electrode sheet, a positive electrode sheet, and a separator, and generally has a substantially cylindrical shape. The battery cell 210 in this embodiment adopts a full tab design, edges of the positive plate and the negative plate are left blank, and after the battery cell 210 is wound, the end face needs to be flattened to flatten the edges of the positive plate and the negative plate, so that the whole end face of the battery cell 210 is equivalent to a tab. The positive current collecting disc is welded with the positive plate, and the negative current collecting disc is welded with the negative plate.

The cells 210 entering the welding jig 110 are generally cells output in the last kneading and flattening process. Specifically, in this embodiment, the apparatus 100 for welding the battery cell and the current collecting tray further includes a conveying mechanism (not shown), where the conveying mechanism is capable of conveying the battery cell 210 to be welded to the welding jig 110, and removing the battery cell 210 from the welding jig 110.

Specifically, the conveying mechanism can accept the battery cell 210 at the output end of the previous kneading and leveling process, and then convey the battery cell 210 to the welding jig 110. After the welding is completed, the conveying mechanism moves the battery cell 210 out of the welding jig 110, and can transfer to the next process. So, through setting up conveying mechanism, can make the welding process of electric core 210 and current collector 220 link up with other battery production processes better, help realizing the automated production of cylinder battery.

Further, in this embodiment, the conveying mechanism includes a conveyor belt and a clamping assembly, the conveyor belt is used for carrying and conveying the battery cell 210, and the clamping assembly can fix the battery cell 210 to the conveyor belt.

The battery cell 210 transferred to the conveying mechanism by the kneading process is generally in a lying state, that is, the side surface of the battery cell 210 contacts with the surface of the conveyor belt, so that both ends of the battery cell 210 are exposed, and the battery cell 210 transferred to the welding jig 110 can be quickly positioned. The clamping assembly can prevent the battery cell 210 from rolling when being conveyed along with the conveyor belt, so that the positioning accuracy of the battery cell 210 on the welding jig 110 is ensured.

Furthermore, in this embodiment, the conveying mechanism further includes a loading assembly (not shown), the loading assembly includes a loading platform, a guide wheel and a roller conveying line, the roller conveying line extends from the loading platform to the conveying belt, and the guide wheel is disposed on two sides of the roller conveying line. The battery cells 210 discharged by the kneading and flattening process are firstly received by the loading table and then are conveyed to the conveyor belt along the roller conveyor line in a rolling manner. Moreover, the guide wheels on two sides of the roller conveying line can play a role in guiding. Therefore, when the battery cell 210 is transferred to the conveyor belt, the posture can be kept stable.

The laser welding mechanism 120 includes a laser generator 121 and a vibrating mirror 122, welding laser emitted from the laser generator 121 can be emitted to a current collecting plate 220 pressed on the battery cell 210 through the vibrating mirror 122 to weld the battery cell 210, and a weld 201 (see fig. 3) for welding the current collecting plate 220 to the battery cell 210 can be formed by the laser welding mechanism 120.

The parameters of the laser generator 121 are adjustable, so that the parameters such as the power of the welding laser, the spot size and the like can be adjusted according to the processing requirements, and the welding laser is suitable for producing cylindrical batteries of different models. The welding laser can penetrate the current collecting disc 220 and melt the surface of the cell 210, thereby forming a weld 201. The depth of the weld 201 is the penetration, which is the distance between the surface of the current collecting plate 220 and the bottom of the weld 201.

The penetration of the weld 201 is directly related to the weld quality. Assuming that the thickness of the current collecting plate 220 is H1 and the thickness of the "tab" (the area flattened for welding) on the surface of the cell 210 is H2, the penetration depth of the weld 210 needs to be greater than H1 and less than H1+ H2. If the penetration depth is too large, there is a risk of welding the battery cell 210 through, and if the penetration depth is too small, weak welding, insufficient welding, and the like are likely to occur.

Specifically, in this embodiment, the two laser welding mechanisms 120 are disposed oppositely, the battery cell 210 clamped to the welding fixture 110 is located between the two laser welding mechanisms 120, and the two laser welding mechanisms 120 can weld two ends of the battery cell 210 respectively. That is to say, the two laser welding mechanisms 120 can weld the two current collecting plates 220, that is, the positive current collecting plate and the negative current collecting plate, to the battery cell 210 at the same time, so that the welding efficiency can be effectively improved.

Obviously, in other embodiments, after the current collecting disc 220 at one end is welded, the battery cell 210 or the galvanometer 122 may be rotated by 180 degrees, so as to weld the current collecting disc 220 at the other end.

Each laser welding mechanism 120 may be individually provided with a laser generator 121. However, in order to simplify the structure, the two laser welding mechanisms 120 in the present embodiment share the laser generator 121.

In this embodiment, the welding fixture 110 includes a rotating mechanism (not shown), and the rotating mechanism can rotate the clamped battery cell 210 around the axis.

Specifically, the rotating mechanism may be driven by a servo motor or a motor screw pair, and the rotation axis of the rotating mechanism is coaxial with the axis of the battery cell 210. The rotating mechanism drives the battery cell 210 to rotate in an intermittent driving manner, and after the vibrating mirror 122 completes welding on one region, the rotating mechanism rotates once to allow the vibrating mirror 122 to weld on another region until welding seams 201 uniformly distributed are formed at the end of the battery cell 210 and the surface of the current collecting disc 220, so as to firmly weld the current collecting disc 220 to the end of the battery cell 210.

Of course, in other embodiments, multiple galvanometers 122 may be provided for each laser welding mechanism 120, and multiple galvanometers 122 may be used to weld multiple regions simultaneously to form evenly distributed welds 201. In this case, the rotating mechanism may be omitted.

The detection mechanism 130 can acquire penetration information of the weld 201 in real time. In the present embodiment, the detection mechanism 130 can move synchronously with the welding track of the laser welding mechanism 120. During the welding process, the spot of the welding laser can move along the welding track, so as to form a weld 201 with a preset shape. The detection mechanism 130 can track the position of the light spot so as to keep synchronization with the welding track of the laser welding mechanism 120. Therefore, each time the welding seam 201 is machined, the detection mechanism 130 can acquire one section of fusion depth information, and the real-time performance is higher.

In this embodiment, the detection mechanism 130 can emit the detection light and can receive the reflected light formed by reflecting the detection light through the weld 201, and the detection mechanism 130 can acquire the penetration information in real time according to the detection light and the reflected light. Specifically, the detection light emitted by the detection mechanism 130 is a pulse signal, so the reflected light is not a pulse signal, and the depth of the weld 201 can be measured in real time by calculating the time difference between the time point when the detection light is emitted and the time point when the reflected light is received, i.e., the penetration information can be obtained.

In addition, the detection mechanism 130 may also obtain the penetration information of the weld 201 in real time through sound wave positioning, image analysis, and the like.

After the penetration information is obtained, whether the welding quality is qualified or not can be judged by analyzing the penetration information. Specifically, the detection mechanism 130 obtains the penetration depth information and generally feeds the penetration depth information back to the processor 140, and the processor 140 analyzes the welding quality according to the penetration depth information.

As described above, the penetration of the weld 201 is directly related to the welding quality, and after receiving the penetration information fed back by the detection mechanism 130, the processor 140 can compare the penetration information obtained in real time with a pre-stored reference range, and if the penetration information obtained in real time is within the reference range, it indicates that the welding quality is better, and the welded electrical core 210 is qualified; otherwise, the welded battery cell 210 is determined to be unqualified.

The unqualified battery cell 210 cannot be subjected to the next process. Specifically, in this embodiment, the apparatus 100 for welding the battery cell to the current collecting tray further includes a screening mechanism (not shown), and the screening mechanism can reject the battery cell 210 that is detected as being failed. The screening mechanism may adopt a sorting manipulator, and when the processor 140 determines that the welded electrical core 210 is not qualified, the screening mechanism may be further controlled to reject the electrical core 210 and drop the electrical core into a waste collection box (not shown).

In the apparatus 100 for welding a battery cell to a current collecting plate, when the laser welding mechanism 120 welds the current collecting plate 220 to the battery cell 210, the detection mechanism 130 can obtain penetration information of the weld 201 in real time. The welding effect can be guaranteed only when the penetration of the welding seam 201 is within a preset interval, so that the penetration information can reflect the quality of the welding seam 201, and whether the welded battery cell 210 is qualified or not can be judged by analyzing the penetration information. Therefore, welding and detection of the battery cell 210 can be performed almost simultaneously, so that a detection procedure is not required to be additionally arranged after welding, time required for welding the battery cell 210 and the current collecting plate 220 is effectively shortened, and battery production efficiency can be improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A device for welding of electric core and current collecting plate, characterized by comprising:

the laser welding mechanism comprises a laser generator and a vibrating mirror, welding laser emitted by the laser generator can be shot to a current collecting plate tightly pressed on the battery cell through the vibrating mirror so as to weld the battery cell, and the laser welding mechanism can form a welding line for welding the current collecting plate on the battery cell; and

2. The apparatus of claim 1, wherein the welding fixture comprises a rotating mechanism, and the rotating mechanism is capable of rotating the clamped cell around an axis.

3. The device for welding the battery core and the current collecting plate according to claim 1, wherein the two laser welding mechanisms are arranged oppositely, the battery core clamped to the welding jig is located between the two laser welding mechanisms, and the two laser welding mechanisms can respectively weld two ends of the battery core.

4. The apparatus of claim 3, wherein the laser generator is shared by two laser welding mechanisms.

5. The device of claim 1, wherein the detection mechanism is capable of emitting detection light and receiving reflected light formed by the detection light reflected by the weld, and the detection mechanism is capable of acquiring the penetration information in real time according to the detection light and the reflected light.

6. The device for welding the battery core and the current collecting plate according to claim 1, wherein the detection mechanism can move synchronously along with a welding track of the laser welding mechanism so as to obtain penetration information of the welding seam in real time.

7. The apparatus according to claim 1, further comprising a screening mechanism, wherein the screening mechanism is capable of rejecting cells detected as being faulty.

8. The apparatus of claim 1, further comprising a delivery mechanism, wherein the delivery mechanism is capable of delivering the cells to be welded to the welding jig and removing the cells from the welding jig.

9. The apparatus of claim 8, wherein the conveying mechanism comprises a conveyor belt and a clamping assembly, the conveyor belt is used for carrying and conveying the battery cell, and the clamping assembly can fix the battery cell to the conveyor belt.

10. The apparatus according to claim 9, wherein the conveying mechanism further comprises a loading assembly, the loading assembly includes a loading platform, a guide wheel, and a roller conveying line, the roller conveying line extends from the loading platform to the conveyor belt, and the guide wheel is disposed on two sides of the roller conveying line.