Welding device and system for battery module aluminum row

Abstract

The utility model relates to the field of battery cell chip welding, in particular to a welding device and system for a battery module aluminum row, the welding device comprises a base and a control unit, the base is provided with an abutting piece, the abutting piece is provided with a temperature sensing device, and the temperature sensing device can abut against the aluminum row; the control unit is in communication connection with the temperature sensing device, and the control unit can draw the temperature data into a temperature curve; the base is provided with a through first channel, the abutting piece is provided with a through second channel, and the first channel is communicated with the second channel; the temperature sensing device is arranged on the abutting piece to collect temperature data of the welding spot, and the temperature data is drawn into a temperature curve, so that the control unit can accurately judge internal defects and external defects of the welding spot; compared with a non-contact infrared CCD, the temperature identification and acquisition precision is higher, and the cost is lower; the welding system comprises a laser device and the welding device, the laser device is opposite to the first channel, and the control unit is in control connection with the laser device.

Description

Technical Field

[0001] The utility model relates to the field of battery cell bar welding, and in particular to a welding device and system for battery module aluminum bars. Background Art

[0002] The aluminum bars and cell poles of lithium battery modules need to be welded by laser. Welding defect identification is a key process. The following are the main methods for welding defect detection: 1. First sample inspection: Destructive testing of sample pull-out force and shear force, metallographic cutting and two-dimensional testing of fusion depth and width, and appearance inspection after welding. 2. Add CCD photography to identify welding appearance defects during the welding process.

[0003] However, it is currently impossible to detect shape defects such as spatter, pores, and weld explosions during the welding process, and it is impossible to identify inherent defects such as incomplete penetration, insufficient weld width and depth.

[0004] Therefore, there is an urgent need for a technical solution to solve the current technical problem of incomplete defect detection of aluminum bar welding. Utility Model Content

[0005] The purpose of the utility model is to provide a welding device and system for aluminum bars of battery modules in order to solve the current technical problem of incomplete defect detection for aluminum bar welding.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A welding device for aluminum bars of a battery module, comprising a base and a control unit, wherein the base is provided with an abutment member, the abutment member is provided with a temperature sensing device, and the temperature sensing device can abut against the aluminum bar;

[0008] The control unit is in communication with the temperature sensing device, and the control unit is capable of plotting temperature data as a temperature curve;

[0009] The base is provided with a through first channel, the abutment member is provided with a through second channel, and the first channel is communicated with the second channel.

[0010] The utility model discloses a welding device for aluminum bars of battery modules. Pressure is applied on a base to make a temperature sensing device contact the aluminum bars. The temperature sensing device can collect temperature information of welding spots more accurately. The temperature information of welding spots is transmitted to a control unit through a communication harness. The control unit processes the temperature information and draws a temperature curve of the welding spots. The control unit fits and compares the temperature curve of the welding spots with a reference temperature curve. Defects in the welding process are judged from the degree of deviation between the temperature curve of the welding spots and the reference temperature curve. Different information displayed on the temperature curve of the welding spots by each defect is different, so that shape defects such as spatter, pores, and blowout welding and internal defects such as incomplete penetration, insufficient molten width and depth that occur in the welding process can be detected.

[0011] As a preferred solution of the utility model, the base is provided with a funnel-shaped structural member, one end of the funnel-shaped structural member is connected to the abutment member, and the other end is connected to the base, and the first channel and the second channel are both connected to the funnel-shaped structural member. The funnel-shaped structural member is provided to make a smooth transition between the abutment member and the base, and the base has a larger force-bearing area, making it easier to apply downward pressure to the base, and the abutment member is smaller in size, so that the aluminum bar is locally subjected to greater force, making it easier for the aluminum bar to abut against the pole; the abutment member is designed to be smaller in size, so that the temperature sensing device can be closer to the welding point, so that the temperature sensing device can collect temperature data of the welding point more accurately.

[0012] As a preferred solution of the utility model, the first channel and the second channel are both columnar channels, and the axis of the columnar channel is collinear with the center line of the funnel-shaped structural member. By making the first channel and the second channel collinear with the center line of the funnel-shaped structural member, it is easier to control the position of the laser when welding the aluminum bar, so that the welding point can always maintain the same distance from the temperature sensing device, thereby ensuring the accuracy of the welding point temperature data collected during welding, and making the defect judgment result more accurate.

[0013] As a preferred solution of the utility model, the abutment member includes a cylindrical structure, one end of which is connected to the base, and the other end is provided with the temperature sensing device. The hollow portion in the middle of the cylindrical structure serves as a second channel for the laser to pass through, and the cylindrical structure is adapted to the pole of the battery cell, so that the aluminum bar can be in closer contact with the pole of the battery cell.

[0014] As a preferred solution of the utility model, an annular groove is provided at the end of the cylindrical structure, and the temperature sensing device includes an annular thermocouple, and the annular thermocouple is adapted to be embedded in the annular groove. The annular thermocouple can collect temperature more accurately; in some embodiments, the annular thermocouple is arranged beyond the end surface of the cylindrical structure so that the annular thermocouple abuts against the aluminum bar and exerts force on the aluminum bar.

[0015] As a preferred solution of the utility model, the abutment member includes a heat-insulating structural member. The heat-insulating structural member can reduce the heat loss at the welding point, so that the temperature sensing device can more accurately collect the temperature of the welding point.

[0016] As a preferred solution of the utility model, the base includes a rectangular block structure, the first channel is arranged in the middle of the rectangular block structure, the rectangular block structure is provided with a plurality of connecting holes, and the connecting holes are arranged at intervals from the first channel. The connecting holes can fix the position of the rectangular block structure, and the path of the laser beam passing through the rectangular block structure is the same each time.

[0017] As a preferred solution of the utility model, a plurality of the connection holes are arranged in a circle on the square block structure with the first channel as the center. The plurality of connection holes fix the square block structure at different positions to prevent the square block structure from being offset.

[0018] A welding system for battery module aluminum bars includes a laser device and the above-mentioned welding system for battery module aluminum bars, wherein the laser device is arranged opposite to the first channel, and the control unit is control-connected to the laser device.

[0019] The utility model discloses a welding system for battery module aluminum bars. The laser device can emit a laser beam into a first channel. The laser beam is converged by a galvanometer and irradiated on the aluminum bars to weld the aluminum bars to the poles. The intensity of the laser beam is controlled by a control unit.

[0020] As a preferred solution of the utility model, the control unit is provided with an alarm light and an interactive device, the alarm light is connected to the control unit in communication, and the control unit is connected to the interactive device in communication. The alarm light can prompt and confirm the welding status; the human-computer interaction interface can set the reference temperature curve and display the defect type output by the control unit.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0022] 1. The utility model is a welding device for battery module aluminum bars. Pressure is applied to the base to make the temperature sensing device contact the aluminum bar. The temperature sensing device can collect the temperature information of the solder joint more accurately. The temperature information of the solder joint is transmitted to the control unit through the communication harness. The control unit processes the temperature information and draws the temperature curve of the solder joint. The control unit fits and compares the temperature curve of the solder joint with the reference temperature curve. The defects in the welding process are judged from the degree of deviation between the temperature curve of the solder joint and the reference temperature curve. The information displayed on the temperature curve of the solder joint is different according to the defects. Therefore, the shape defects such as spatter, pores, and blowout and the internal defects such as incomplete penetration, insufficient molten width and depth that occur in the welding process can be detected.

[0023] 2. The utility model is a welding device for battery module aluminum bars. A temperature sensing device is arranged on the abutment to collect temperature data of the solder joint, and the temperature data is plotted as a temperature curve, so that the control unit can accurately judge the internal and external defects of the solder joint. Compared with non-contact infrared CCD temperature recognition, the collection accuracy is higher and the cost is lower, and it has good economic value and practical value.

[0024] 3. The utility model is a welding system for battery module aluminum bars. The laser device can emit a laser beam into the first channel. The laser beam is converged by a galvanometer and irradiated on the aluminum bar to weld the aluminum bar to the pole. The intensity of the laser beam is controlled by a control unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural schematic diagram of a welding device for battery module aluminum bars in Example 1;

[0026] Figure 2 is a schematic cross-sectional structural diagram of the base of Example 1;

[0027] Figure 3 It is a partially enlarged schematic diagram of a welding device for battery module aluminum bars in Example 1;

[0028] Figure 4 1 is a schematic diagram of a top view of a welding device for battery module aluminum bars in Example 1;

[0029] Figure 5 This is a schematic diagram of a welding device for battery module aluminum bars in use according to Example 1;

[0030] Figure 6 This is a schematic diagram of a defect detection process of a welding device for battery module aluminum bars in Example 1;

[0031] Figure 7 It is a structural schematic diagram of a welding system for battery module aluminum bars according to Example 4.

[0032] icon:

[0033] 1-base, 2-control unit, 3-abutment, 4-temperature sensing device, 5-funnel-shaped structural member, 6-communication wiring harness, 7-first channel, 8-second channel, 9-connecting hole, 10-annular groove, 11-aluminum row, 12-pole, 13-laser device, 14-galvanometer, 15-warning light, 16-interactive device. DETAILED DESCRIPTION

[0034] The utility model is described in detail below in conjunction with the accompanying drawings.

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0036] Example 1

[0037] like Figure 1-Figure 6 A welding device for aluminum bars of a battery module shown in the figure comprises a base 1 and a control unit 2, wherein the base 1 is provided with an abutment member 3, and the abutment member 3 is provided with a temperature sensing device 4, and the temperature sensing device 4 can abut against the aluminum bar 11;

[0038] The control unit 2 is in communication with the temperature sensing device 4, and the control unit 2 is capable of plotting temperature data as a temperature curve;

[0039] The base 1 is provided with a through first channel 7 , and the abutment member 3 is provided with a through second channel 8 , and the first channel 7 is communicated with the second channel 8 .

[0040] Apply pressure on the base 1 to make the temperature sensing device 4 contact the aluminum bar 11. The temperature sensing device 4 can collect the temperature information of the solder joint more accurately. The temperature information of the solder joint is transmitted to the control unit 2 through the communication harness 6. The control unit 2 processes the temperature information and draws it into a temperature curve of the solder joint. The control unit 2 fits and compares the temperature curve of the solder joint with the reference temperature curve. The defects in the welding process are judged from the degree of deviation between the temperature curve of the solder joint and the reference temperature curve. The information displayed on the temperature curve of the solder joint is different according to the defects. Therefore, the shape defects such as spatter, pores, and blowout and the inherent defects such as incomplete penetration, insufficient weld width and depth that appear in the welding process can be detected.

[0041] Specifically, a funnel-shaped structural member 5 is provided on the base 1, one end of the funnel-shaped structural member 5 is connected to the abutment 3, and the other end is connected to the base 1, and the first channel 7 and the second channel 8 are both connected to the funnel-shaped structural member 5; by providing the funnel-shaped structural member 5, the pressure applied to the base 1 can be transmitted to the abutment 3, and the volume of the base 1 can be set to be larger, so that the base 1 has a larger force-bearing area, and it is easier to apply force to the base 1; the volume of the abutment 3 is smaller, so that the temperature sensing device 4 can be closer to the welding point, thereby more accurately collecting the temperature data of the welding point; the axis of the cylindrical first channel 7 and the axis of the cylindrical second channel 8 are both colinear with the center line of the funnel-shaped structural member 5; so that the laser can be irradiated on the aluminum row 11 through the first channel 7, the middle channel of the funnel-shaped structural member 5 and the second channel 8 in sequence; it is convenient to adjust the irradiation position of the laser on the aluminum plate.

[0042] Specifically, the abutment member 3 is a tubular structure with heat insulation performance. One end of the tubular structure is connected to the base 1, and an annular groove 10 centered on the axis of the tubular structure is set on the end surface of the other end. An annular thermocouple adapted to the annular groove 10 is embedded in the annular groove 10, and the annular thermocouple is made to protrude from the end surface of the tubular structure. The annular thermocouple can accurately measure the temperature at the center of the ring. When the laser welds the aluminum bar 11, the laser welding point is located at the center of the annular thermocouple, so that the data collected by the annular thermocouple is more accurate; the tubular structure is made of heat insulation material, which can reduce the heat loss of the welding point, so that the data collected by the annular thermocouple is more accurate; the data collected by the annular thermocouple is transmitted to the control unit 2 through the communication harness 6.

[0043] Specifically, the base 1 includes a rectangular block structure, a first channel 7 is arranged in the middle of the rectangular block structure, and the rectangular block structure is provided with a plurality of connecting holes 9 arranged in a ring direction around the first channel 7, and the connecting holes 9 are spaced apart from the first channel 7; the base 1 is positioned through the plurality of connecting holes 9 so that the welding point is always located at the center of the annular thermocouple.

[0044] A high-precision thermocouple abutment 3 is installed on the base 1. The thermocouple collects temperature data that meets the welding quality requirements during the 3S period of welding the aluminum bar 11. The thermocouple collection frequency is 10ms-30ms. The temperature data is plotted into a continuous temperature curve by the control unit 2. By adjusting the laser welding power and other methods, the same welding point is welded multiple times to find the upper and lower limits of the temperature curve that meet the welding quality requirements, which are used as a reference temperature curve for judging whether the welding penetration depth and width are qualified; when welding the aluminum bar 11, the temperature curve of the welding point is fitted and compared with the above-mentioned reference temperature curve. If it exceeds the upper and lower limits of the reference temperature curve, it is judged as NG, and the information is transmitted to the warning light to alarm and prompt and return for repair. If it is within the upper and lower limits, it is judged as OK.

[0045] Example 2

[0046] The present embodiment is a welding device for battery module aluminum bars, and its structure is substantially the same as that of the first embodiment. The difference from the first embodiment is that the annular thermocouple is flush with the end surface of the cylindrical structural member.

[0047] When the end surface of the cylindrical structure abuts against the aluminum bar 11 , the annular thermocouple contacts the aluminum bar 11 .

[0048] Example 3

[0049] The present embodiment is a welding device for battery module aluminum bars, and its structure is substantially the same as that of the first embodiment. The difference from the first embodiment is that the temperature sensing device 4 includes a plurality of thermal resistance sensors.

[0050] A plurality of thermal resistance sensors are arranged on the inner wall of the cylindrical structure, and the thermal resistance sensors can be in contact with the aluminum row 11 .

[0051] Example 4

[0052] like Figure 7 A welding system for battery module aluminum bars is shown, including a laser device 13, and also includes a welding device for battery module aluminum bars of Example 1 / Example 2 / Example 3, the laser device 13 is arranged opposite to the first channel 7, and the control unit 2 is controlled and connected to the laser device 13.

[0053] Specifically, the control unit 2 is provided with an alarm light 15 and an interactive device 16 . The alarm light 15 is communicatively connected to the control unit 2 , and the control unit 2 is communicatively connected to the interactive device 16 .

[0054] The laser device 13 can emit a laser beam into the first channel 7. The laser beam is converged by the galvanometer 14 and then irradiated onto the aluminum bar 11, so that the aluminum bar 11 is welded to the pole 12. The intensity of the laser beam is controlled by the control unit 2. The alarm light 15 and the interactive device 16 can warn and display welding defects.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding device for battery module aluminum bars, characterized in that: It comprises a base (1) and a control unit (2), the base (1) being provided with an abutment member (3), the abutment member (3) being provided with a temperature sensing device (4), and the temperature sensing device (4) being capable of abutting against an aluminum bar (11); The control unit (2) is in communication connection with the temperature sensing device (4), and the control unit (2) is capable of plotting temperature data as a temperature curve; The base (1) is provided with a through first channel (7), the abutment member (3) is provided with a through second channel (8), and the first channel (7) is in communication with the second channel (8).

2. A welding device for battery module aluminum bars as claimed in claim 1, characterized in that: The base (1) is provided with a funnel-shaped structural member (5), one end of the funnel-shaped structural member (5) is connected to the abutment member (3), and the other end is connected to the base (1), and the first channel (7) and the second channel (8) are both connected to the funnel-shaped structural member (5).

3. A welding device for battery module aluminum bars as claimed in claim 2, characterized in that: The first channel (7) and the second channel (8) are both columnar channels, and the axes of the columnar channels are colinear with the center line of the funnel-shaped structural member (5).

4. A welding device for battery module aluminum bars as claimed in claim 1, characterized in that: The abutment member (3) comprises a tubular structure, one end of which is connected to the base (1) and the other end of which is provided with the temperature sensing device (4).

5. A welding device for battery module aluminum bars as claimed in claim 4, characterized in that: An annular groove (10) is provided at the end of the cylindrical structural member, and the temperature sensing device (4) comprises an annular thermocouple, which is adapted to be embedded in the annular groove (10).

6. A welding device for battery module aluminum bars as claimed in claim 1, characterized in that: The abutment member (3) comprises a heat insulation structural member.

7. A welding device for battery module aluminum bars according to any one of claims 1 to 6, characterized in that: The base (1) comprises a rectangular block structure, the first channel (7) is arranged in the middle of the rectangular block structure, the rectangular block structure is provided with a plurality of connection holes (9), and the connection holes (9) are arranged at intervals from the first channel (7).

8. A welding device for battery module aluminum bars as claimed in claim 7, characterized in that: The plurality of connection holes (9) are arranged in a circular direction on the rectangular block structure with the first channel (7) as the center.

9. A welding system for battery module aluminum bars, characterized in that: It comprises a laser device (13) and also comprises a welding device for battery module aluminum bars according to any one of claims 1 to 8, wherein the laser device (13) is arranged opposite to the first channel (7), and the control unit (2) is connected to the laser device (13) for control.

10. A welding system for battery module aluminum bars as claimed in claim 9, characterized in that: The control unit (2) is provided with an alarm light (15) and an interaction device (16); the alarm light (15) is communicatively connected to the control unit (2); and the control unit (2) is communicatively connected to the interaction device (16).

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