CN109877489B - Welding detection system and method - Google Patents
Welding detection system and method Download PDFInfo
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- CN109877489B CN109877489B CN201910146625.1A CN201910146625A CN109877489B CN 109877489 B CN109877489 B CN 109877489B CN 201910146625 A CN201910146625 A CN 201910146625A CN 109877489 B CN109877489 B CN 109877489B
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Abstract
The invention relates to a welding detection system and a method. The welding detection system includes: the welding device comprises a welding head, a transmission device and a detection device, wherein the detection device is fixed on the welding head, the transmission device is connected with the detection device, the transmission device is in contact connection with a welding wire, and one end of the welding wire is in contact connection with the welding head; the detection device is used for detecting the welding state according to the pressure action of the welding wire on the transmission device when the welding head is lifted. The detection device of the welding detection system is used for detecting the welding state according to the pressure action of the welding wire generated by the welding head to the transmission device when the welding head is lifted, so that the welding state can be timely detected according to the pressure action of the welding wire generated by the welding head to the transmission device when the welding head is lifted after welding is completed, re-welding can be timely completed after the cold welding is detected, the problem of cold welding is reduced or even avoided, and the safety and the stability of the power battery module are improved.
Description
Technical Field
The invention relates to the field of welding of power battery modules, in particular to a welding detection system and a welding detection method.
Background
With the rapid development of power battery technology, power batteries have become the main power source for electric vehicles, electric bicycles, and other tools. When the power battery is used as a power source, the power battery needs to be welded to form a power battery module, and the power battery module is used for providing power for tools such as an electric automobile and an electric bicycle.
According to the traditional welding technology of the power battery module, the power battery is welded by using an aluminum wire, so that the power battery module with high energy density and long service life is formed.
However, the conventional power battery module welding technology cannot detect the welding state in time, so that the power battery module has the problem of insufficient welding.
Disclosure of Invention
Therefore, it is necessary to provide a welding detection system and method for solving the problem that the welding state cannot be detected in time and the power battery module has insufficient welding in the conventional power battery module welding technology.
A welding detection system, comprising: a welding head, a transmission device and a detection device, wherein the detection device is fixed on the welding head, the transmission device is connected with the detection device, wherein,
the transmission device is in contact connection with a welding wire, and one end of the welding wire is in contact connection with the welding head;
the detection device is used for detecting the welding state according to the pressure action of the welding wire on the transmission device when the welding head is lifted.
The welding detection system that above-mentioned embodiment provided includes the bonding tool, transmission and detection device, and detection device is used for driving the pressure action that the bonding wire produced to transmission when the bonding tool lifts up and detects the welding state, can be after the welding is accomplished like this, in time detect the welding state according to the pressure action that the bonding wire produced to transmission when the bonding tool lifts up, can in time accomplish the re-welding after detecting the rosin joint and producing, reduce and even avoid the rosin joint problem, improve the security and the stability of power battery module.
In one embodiment, the detection means comprises displacement detection means;
the displacement detection device is used for detecting the displacement of the transmission device when the welding wire generates pressure action on the transmission device, and detecting the welding state according to the displacement of the transmission device.
In one embodiment, the detection device comprises an elastic device and a displacement detection device connected with the elastic device;
the elastic device is used for driving the welding wire to generate displacement when the welding head is lifted to generate pressure action on the transmission device;
the displacement detection device is used for detecting the displacement of the elastic device and detecting the welding state according to the displacement of the elastic device.
In one embodiment, the displacement detection device is specifically configured to detect the welding state according to a displacement amount of the transmission device and a preset displacement threshold or according to a displacement amount of the elastic device and a preset displacement threshold; if the displacement of the transmission device or the displacement of the elastic device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint; and if the displacement of the transmission device or the displacement of the elastic device is larger than the preset displacement threshold, determining that the welding state is normal.
In one embodiment, the detection means comprises pressure detection means;
the pressure detection device is used for detecting a pressure value of pressure action generated by the welding wire on the transmission device when a welding head in the welding detection system is lifted, and detecting the welding state according to the pressure value.
In one embodiment, the pressure detection device is specifically configured to detect the welding state according to the pressure value and a preset pressure threshold; if the pressure value is smaller than or equal to the preset pressure threshold value, determining that the welding state is a cold joint; and if the pressure value is larger than the preset pressure threshold value, determining that the welding state is normal.
A welding detection method applied to the welding detection system of the above embodiment, the method comprising:
and detecting the welding state according to the pressure action of the welding wire on the transmission device generated by the lifting of a welding head in the welding detection system.
According to the welding detection method provided by the embodiment, the welding state is detected according to the pressure action of the welding wire on the transmission device when the welding head in the welding detection system is lifted, so that the welding state can be detected in time according to the pressure action of the welding wire on the transmission device when the welding head is lifted after welding is completed, re-welding can be completed in time after insufficient welding is detected, the insufficient welding problem is reduced or even avoided, and the safety and the stability of the power battery module are improved.
In one embodiment, the detecting the welding state according to the action of the pressure generated by the welding wire on the transmission device when a welding head in the welding detection system is lifted comprises:
acquiring the displacement of a transmission device in the welding detection system under the pressure action;
comparing the displacement of the transmission device with the preset displacement threshold;
if the displacement of the transmission device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint;
and if the displacement of the transmission device is larger than the preset displacement threshold, determining that the welding state is normal.
In one embodiment, the detecting the welding state according to the action of the welding head in the welding detection system driving the welding wire to generate pressure on the transmission device when the welding head is lifted comprises:
acquiring the displacement of an elastic device in the welding detection system under the pressure action;
comparing the displacement of the elastic device with the preset displacement threshold;
if the displacement of the elastic device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint;
and if the displacement of the elastic device is larger than the preset displacement threshold, determining that the welding state is normal.
In one embodiment, the detecting the welding state according to the action of the welding head in the welding detection system driving the welding wire to generate pressure on the transmission device when the welding head is lifted comprises:
acquiring a pressure value of pressure action generated by the welding wire on the transmission device when a welding head in the welding detection system is lifted;
comparing the pressure value with the preset pressure threshold value;
if the pressure value is smaller than or equal to the preset pressure threshold value, determining that the welding state is a cold joint;
and if the pressure value is larger than the preset pressure threshold value, determining that the welding state is normal.
In the welding detection system and method provided by the above embodiments, the welding detection system includes the welding head, the transmission device and the detection device, and the detection device is used for detecting the welding state according to the pressure action of the welding wire on the transmission device when the welding head is lifted, so that after welding is completed, the welding state can be detected in time according to the pressure action of the welding wire on the transmission device when the welding head is lifted, and after a cold joint is detected, re-welding can be completed in time, thereby reducing or even avoiding the problem of cold joint, and improving the safety and stability of the power battery module.
Drawings
FIG. 1 is a schematic view of a weld detection system provided in accordance with one embodiment;
FIG. 2 is a schematic view of a weld detection system according to another embodiment;
FIG. 3 is a schematic view of a weld detection system according to another embodiment;
FIG. 4 is a schematic view of a weld detection system according to another embodiment;
FIG. 5 is a schematic flow chart diagram of a weld detection method according to one embodiment;
FIG. 6 is a schematic flow chart diagram of a weld detection method according to another embodiment;
fig. 7 is a schematic flowchart of a welding detection method according to another embodiment.
Description of reference numerals:
a bonding tool 100; a transmission 200; a detection device 300;
a displacement detecting device 310; a resilient means 320; a pressure detection device 330.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The traditional welding technology for the power battery module cannot detect the welding state in time, so that the power battery module has the problem of insufficient welding. Therefore, the embodiment of the invention provides a welding detection system and a welding detection method, which aim to solve the technical problems of the traditional technology.
The following describes the technical solution of the present invention and how to solve the above technical problems with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
FIG. 1 is a schematic view of a weld detection system according to one embodiment. As shown in fig. 1, the welding detection system includes: the welding head 100, the transmission device 200 and the detection device 300, wherein the detection device 300 is fixed on the welding head 100, the transmission device 200 is connected with the detection device 300, the transmission device 200 is connected with a welding wire in a contact manner, and one end of the welding wire is connected with the welding head 100 in a contact manner; the detection device 300 is configured to detect a welding state according to an action of the pressure generated by the wire on the transmission device 200 when the welding head 100 is lifted.
Specifically, the welding head 100 may be an ultrasonic welding head, and the high-frequency vibration wave is transmitted to the welding wire and the negative electrode welding surface of the power battery to be connected, so that the welding wire and the negative electrode welding surface of the power battery rub against each other under pressurization to form fusion between molecular layers, thereby forming the power battery module. Optionally, the welding wire may be an aluminum wire or an aluminum strip.
The transmission 200 is in contact with the welding wire, and one end of the welding wire is in contact with the welding head 100. Optionally, the transmission 200 has a groove around its periphery, and the welding wire can be wound around the groove to contact the transmission 200. Alternatively, the transmission 200 may be a wood transmission, a steel transmission, or an engineering plastic transmission.
The detection device 300 is configured to detect a welding state according to a pressure action generated by the welding wire on the transmission device 200 when the welding head 100 is lifted, where the welding state includes a cold joint and a normal welding state, the cold joint refers to a welding state in which a plurality of lithium ion battery cell monomers are combined together in a series and parallel manner to form a module, and in an aluminum wire welding process, because a used aluminum wire is thin, a welding surface of a battery cathode is narrow, and the aluminum wire cannot well combine the battery cell with the busbar, contact resistance of the aluminum wire and a welding point of the busbar is increased; the normal welding refers to the welding state that when a plurality of lithium ion battery cell monomers are combined together in a series connection mode and a parallel connection mode to form a module, the battery cell and the bus bar are well combined by the aluminum wire. Alternatively, the detection device 300 may detect the welding state according to a displacement amount of the transmission device 200 generated when the welding wire applies pressure to the transmission device 200, or the detection device 300 may detect a pressure value of the welding wire applied to the transmission device 200, and detect the welding state according to the pressure value.
For example, as shown in fig. 1, when welding is completed and the welding head is lifted, the welding wire generates a rightward pressure on the transmission device along with the lifting of the welding head, so that the transmission device generates a rightward displacement, if a displacement amount generated by the transmission device when the welding wire generates the pressure on the transmission device is smaller than a preset displacement amount, the detection device may determine that the welding state is a false welding, and if the displacement amount generated by the transmission device when the welding wire generates the pressure on the transmission device is larger than the preset displacement amount, the detection device may determine that the welding state is a normal welding.
In this embodiment, the welding detection system includes the bonding tool, transmission and detection device, and detection device is used for driving the bonding wire to detect the welding state to the pressure action that transmission produced when the bonding tool lifts up, can be after the welding is accomplished like this, in time detect the welding state according to the pressure action that the bonding wire produced transmission when the bonding tool lifts up, can in time accomplish the re-welding after detecting the rosin joint and producing, reduce and even avoid the rosin joint problem, improve the security and the stability of power battery module.
FIG. 2 is a schematic view of a weld detection system according to another embodiment. As shown in fig. 2, the detecting device 300 includes a displacement detecting device 310; the displacement detecting device 310 is configured to detect a displacement of the transmission device 200 when the welding wire presses the transmission device 200, and detect the welding state according to the displacement of the transmission device 200.
Specifically, the detecting device 300 includes a displacement detecting device 310 for detecting a displacement of the actuator 200 when the wire presses the actuator 200, and detecting a welding state according to the displacement of the actuator 200. Alternatively, the displacement detecting device 310 may be a displacement sensor. Optionally, the displacement detecting device 310 is specifically used for detecting the welding state based on the displacement of the transmission device 200 and a preset displacement threshold. For example, the difference between the displacement of the transmission 200 and a preset displacement threshold may be calculated, and if the difference is positive, the welding state may be determined as a cold joint, and if the difference is negative, the welding state may be determined as a normal joint.
In this embodiment, detection device includes displacement detection device, displacement detection device is used for detecting the displacement volume of welding wire transmission when producing pressure to transmission to according to transmission's displacement volume detection weld state, can in time detect weld state according to the displacement volume of welding wire transmission when producing pressure to transmission like this after the welding is accomplished, can in time accomplish the re-welding after detecting the rosin joint and producing, reduce and avoid the rosin joint problem even, improve the security and the stability of power battery module.
FIG. 3 is a schematic view of a weld detection system according to another embodiment. As shown in fig. 3, the detecting device 300 includes an elastic device 320, and a displacement detecting device 310 connected to the elastic device 320; the elastic device 320 is used for driving the welding wire to generate displacement when the welding head 100 is lifted to generate pressure action on the transmission device 200; the displacement detecting device 310 is used for detecting the displacement of the elastic device 320 and detecting the welding state according to the displacement of the elastic device 320.
Specifically, the detecting device 300 includes an elastic device 320 and a displacement detecting device 310 connected to the elastic device 320. The elastic means 320 is connected to the actuator 200 for generating displacement when the actuator 200 generates pressure. Alternatively, the elastic device 320 may be a spring, a compression spring, or other components capable of converting a pressure into a displacement.
The displacement detecting device 310 is connected to the elastic device 320, and is configured to detect a displacement of the elastic device 320 and detect a welding state according to the displacement of the elastic device 320. Alternatively, the displacement detecting device 310 may be a displacement sensor. Optionally, the displacement detecting device 310 is specifically configured to detect the welding state according to the displacement amount of the elastic device 320 and a preset displacement threshold. For example, a difference between the displacement of the elastic device 320 and a preset displacement threshold may be calculated, and if the difference is positive, the welding state may be determined as a cold joint, and if the difference is negative, the welding state may be determined as a normal joint.
In this embodiment, detection device includes the elastic device and the displacement detection device who is connected with the elastic device, the elastic device produces the displacement when transmission produces pressure, displacement detection device detects the displacement volume of elastic device and detects the welding state according to the displacement volume, can be like this after the welding is accomplished, in time detect the welding state according to the displacement volume of elastic device when transmission produces pressure, can in time accomplish the rewelding after detecting the rosin joint and producing, reduce or even avoid the rosin joint problem, improve the security and the stability of power battery module.
In one embodiment, the displacement detecting device 310 is specifically configured to detect the welding state according to a displacement amount of the transmission device 200 and a preset displacement threshold or according to a displacement amount of the elastic device 320 and a preset displacement threshold; if the displacement of the transmission device 200 or the displacement of the elastic device 320 is less than or equal to the preset displacement threshold, determining that the welding state is a cold joint; if the displacement of the transmission device 200 or the displacement of the elastic device 320 is greater than the preset displacement threshold, it is determined that the welding state is normal.
Specifically, the displacement detection device 310 compares the displacement of the transmission device 200 with a preset displacement threshold, and if the displacement generated by the transmission device 200 is less than or equal to the preset displacement threshold, it is determined that the welding state is a cold joint; if the displacement generated by the transmission device 200 is greater than the preset displacement threshold, the welding state is determined to be normal. Or, the displacement detecting device 310 compares the displacement of the elastic device 320 with a preset displacement threshold, and if the displacement of the elastic device 320 is less than or equal to the preset displacement threshold, it is determined that the welding state is a cold joint; if the displacement of the elastic device 320 is greater than the preset displacement threshold, the welding state is determined to be normal. For example, the preset displacement threshold is 0.4mm, and if the displacement of the elastic device 320 detected by the displacement detection device 310 is 0.3mm and is smaller than the preset displacement threshold, it is determined that the welding state is a cold joint; if the displacement detecting device 310 detects that the displacement of the elastic device 320 is 0.6mm, and is greater than the preset displacement threshold, it is determined that the welding state is normal.
In this embodiment, the displacement detection device compares the displacement of the transmission device with a preset displacement threshold, or compares the displacement of the elastic device with a preset displacement threshold, and if the displacement of the transmission device or the displacement of the elastic device is less than or equal to the preset displacement threshold, it is determined that the welding state is a cold joint; if transmission's the displacement volume or the displacement volume of elasticity device is greater than preset displacement threshold value, then confirm that the welding state is the welding normal, and the process of detecting the welding state is very simple, has improved the efficiency of confirming the welding state, can in time detect the welding state after the welding is accomplished, can in time accomplish the rewelding after detecting the rosin joint and producing, reduces or even avoids the rosin joint problem, improves the security and the stability of power battery module.
FIG. 4 is a schematic view of a weld detection system according to another embodiment. As shown in fig. 4, the detecting means 300 includes a pressure detecting means 330; the pressure detection device 330 is configured to detect a pressure value of a pressure action that the welding wire is driven to generate on the transmission device 200 when the welding head 100 is lifted in the welding detection system, and detect the welding state according to the pressure value.
Specifically, the detection device 300 includes a pressure detection device 330, and the pressure detection device 330 is configured to detect a pressure value of a pressure action that is generated by the welding wire to the transmission device 200 when the welding head 100 is lifted in the welding detection system, and detect a welding state according to the pressure value. Optionally, the pressure detection device 330 is specifically configured to detect a welding state according to a pressure value of a pressure action that the welding wire is driven to generate on the transmission device 200 when the welding head 100 is lifted in the welding detection system and a preset pressure threshold. For example, a difference between a pressure value of a pressure action generated by the welding wire on the transmission device 200 when the welding head 100 is lifted in the welding detection system and a preset pressure threshold may be calculated, and if the difference is positive, the welding state may be determined as a cold joint, and if the difference is negative, the welding state may be determined as a normal welding.
In this embodiment, the detection device includes a pressure detection device, the pressure detection device is used for detecting the pressure value of the pressure action of the welding wire on the transmission device when the welding head is lifted in the welding detection system, and detecting the welding state according to the pressure value, thus the welding state can be detected in time according to the pressure value of the pressure action of the welding wire on the transmission device when the welding head is lifted after welding is completed, after the rosin joint is detected to be generated, the reflow soldering can be completed in time, the rosin joint problem is reduced or even avoided, and the safety and the stability of the power battery module are improved.
In one embodiment, please continue to refer to fig. 4, the pressure detection device 330 is specifically configured to compare the pressure value with the preset pressure threshold; if the pressure value is smaller than or equal to the preset pressure threshold value, determining that the welding state is a cold joint; and if the pressure value is larger than the preset pressure threshold value, determining that the welding state is normal.
Specifically, the pressure detection device 330 compares a pressure value of a pressure action generated by the welding wire to the transmission device 200 when the welding head 100 is lifted with a preset pressure threshold, and determines that the welding state is a cold joint if the pressure value of the pressure action generated by the welding wire to the transmission device 200 when the welding head 100 is lifted is less than or equal to the preset pressure threshold; if the pressure value of the pressure action generated by the welding wire on the transmission device 200 when the welding head 100 is lifted is larger than the preset pressure threshold value, the welding state is determined to be normal welding. For example, the preset pressure threshold is 0.6N, if the pressure detection device 330 detects that the pressure value for driving the welding wire to generate the pressure action on the transmission device 200 when the welding head 100 is lifted is 0.3N, and if the pressure value is smaller than the preset pressure threshold, it is determined that the welding state is the cold joint; if the pressure detection device 330 detects that the pressure value of the pressure action generated by the welding wire on the transmission device 200 when the welding head 100 is lifted is 0.7N, and is greater than the preset pressure threshold value, the welding state is determined to be normal welding.
In this embodiment, the pressure detection device compares a pressure value of the pressure action generated by the welding wire to the transmission device when the welding head is lifted with a preset pressure threshold, and if the pressure value of the pressure action generated by the welding wire to the transmission device when the welding head is lifted is smaller than or equal to the preset pressure threshold, it is determined that the welding state is cold welding; if the pressure value of the pressure action of the welding wire on the transmission device is larger than the preset pressure threshold value when the welding head is lifted, the welding state is determined to be normal, the process of detecting the welding state is very simple, the efficiency of determining the welding state is improved, the welding state can be detected in time after the welding is completed, the reflow soldering can be completed in time after the rosin joint is detected, the problem of the rosin joint is reduced or even avoided, and the safety and the stability of the power battery module are improved.
The present embodiment provides a welding detection method, which is applied to the welding detection system described in the above embodiments. The method comprises the following steps: and detecting the welding state according to the pressure action of the welding wire on the transmission device generated by the lifting of a welding head in the welding detection system.
Specifically, when the welding head in the welding detection system is lifted, the welding wire is driven to generate pressure on the transmission device, and the welding detection equipment can detect the welding state according to the pressure action generated by the transmission device. The welding state comprises a cold joint and a normal welding state, wherein the cold joint refers to a welding state that when a plurality of lithium ion battery cell monomers are combined together in a series connection and parallel connection mode to form a module, in the aluminum wire welding process, because the used aluminum wire is thin, the welding surface of the battery cathode is narrow, and the aluminum wire cannot well combine the battery cell with the bus bar, the contact resistance of the aluminum wire and the bus bar welding point is increased; the normal welding refers to the welding state that when a plurality of lithium ion battery cell monomers are combined together in a series connection mode and a parallel connection mode to form a module, the battery cell and the bus bar are well combined by the aluminum wire. Optionally, the welding detection device may detect the welding state according to a displacement of the transmission device when the welding wire generates a pressure action on the transmission device when the welding head in the welding detection system is lifted.
In this embodiment, the welding detection method includes detecting the welding state according to the pressure action of the welding wire on the transmission device when the welding head in the welding detection system is lifted, so that the welding state can be detected in time according to the pressure action of the welding wire on the transmission device when the welding head is lifted after welding is completed, and after the insufficient solder is detected, re-welding can be completed in time, thereby reducing or even avoiding the insufficient solder problem, and improving the safety and stability of the power battery module.
Fig. 5 is a schematic flow chart of a welding detection method according to another embodiment. The embodiment relates to a concrete implementation process for detecting a welding state by acquiring the displacement of a transmission device in a welding detection system according to the pressure action of a welding wire on a transmission device generated by lifting a welding head. As shown in fig. 5, the method includes:
s501, acquiring the displacement of a transmission device in the welding detection system under the pressure action.
Optionally, the welding detection device may obtain, through the displacement sensor, a displacement amount of the transmission device when the welding head in the welding detection system is lifted up and the pressure generated by the welding wire to the transmission device is operated, and may also obtain, through another displacement detector, a displacement amount of the transmission device when the welding head in the welding detection system is lifted up and the pressure generated by the welding wire to the transmission device is operated.
S502, comparing the displacement of the transmission device with the preset displacement threshold; if the displacement of the transmission device is less than or equal to the preset displacement threshold, executing step 403; if the displacement of the transmission is greater than the preset displacement threshold, step 404 is executed.
Specifically, after the welding detection device obtains the displacement of the transmission device when the welding head is lifted to drive the welding wire to generate pressure action on the transmission device, the displacement of the transmission device is compared with a preset displacement threshold value. If the displacement of the transmission device is less than or equal to the preset displacement threshold, the welding state is determined to be a cold joint, step 503 is executed, and if the displacement of the transmission device is greater than the preset displacement threshold, the welding state is determined to be normal welding, step 504 is executed.
S503, determining that the welding state is cold joint.
Specifically, if the displacement of the transmission device is less than or equal to a preset displacement threshold, the welding state is determined to be a cold joint. For example, the preset displacement threshold is 0.4mm, and if the displacement of the transmission device is 0.3mm and is smaller than the preset displacement threshold, the welding state is determined to be a cold joint.
And S504, determining that the welding state is normal.
Specifically, if the displacement of the transmission device is larger than a preset displacement threshold, it is determined that the welding state is normal. For example, the preset displacement threshold is 0.4mm, and if the displacement of the transmission device is 0.6mm and is greater than the preset displacement threshold, the welding state is determined to be normal.
In this embodiment, welding check out test set drives the displacement volume of transmission when the pressure action that the welding wire produced transmission when acquireing that the bonding tool lifts up, and the process of detecting welding state according to transmission's displacement volume and predetermined displacement threshold value is very simple, has improved the efficiency of confirming welding state, can in time detect welding state after the welding is accomplished, can in time accomplish the after-welding after detecting the rosin joint and producing, reduces or even avoids the rosin joint problem, improves the security and the stability of power battery module.
Fig. 6 is a schematic flowchart of a welding detection method according to another embodiment. The embodiment relates to a concrete implementation process for detecting a welding state by acquiring the displacement of an elastic device in a welding detection system according to the pressure action of a welding wire on a transmission device when a welding head is lifted. As shown in fig. 6, the method includes:
s601, acquiring the displacement of the elastic device in the welding detection system under the pressure action.
Optionally, the welding detection apparatus may obtain, by using a displacement sensor, a displacement amount generated by the elastic device in the welding detection system under the pressure action of the transmission device, or obtain, by using another displacement detector, a displacement amount generated by the elastic device in the welding detection system under the pressure action of the transmission device.
S602, comparing the displacement of the elastic device with a preset displacement threshold; if the displacement of the elastic device is less than or equal to the preset displacement threshold, go to step 503; if the displacement of the elastic device is greater than the predetermined displacement threshold, step 504 is executed.
Specifically, after the welding detection device obtains the displacement of the elastic device when the welding head lifts up to drive the welding wire to generate pressure action on the transmission device, the displacement of the elastic device is compared with a preset displacement threshold value. If the displacement of the elastic device is less than or equal to the preset displacement threshold, the welding state is determined to be a cold joint, step 603 is executed, and if the displacement of the elastic device is greater than the preset displacement threshold, the welding state is determined to be a normal welding state, and step 604 is executed.
S603, determining the welding state as cold joint.
Specifically, if the displacement of the elastic device is less than or equal to the preset displacement threshold, the welding state is determined to be a cold joint. For example, the preset displacement threshold is 0.4mm, and if the displacement of the transmission device is 0.3mm and is smaller than the preset displacement threshold, the welding state is determined to be a cold joint.
S604, determining that the welding state is normal welding.
Specifically, if the displacement of the elastic device is greater than a preset displacement threshold, it is determined that the welding state is normal. For example, the preset displacement threshold is 0.4mm, and if the displacement of the transmission device is 0.6mm and is greater than the preset displacement threshold, the welding state is determined to be normal.
In this embodiment, the welding detection equipment drives the displacement volume of elastic device when the pressure action that the welding wire produced transmission device when acquireing that the bonding tool lifts up, the process of detecting welding state according to elastic device's displacement volume and predetermined displacement threshold value is very simple, the efficiency of confirming welding state has been improved, can in time detect welding state after the welding is accomplished, can in time accomplish the after-welding after detecting the rosin joint and producing, reduce and avoid the rosin joint problem even, improve the security and the stability of power battery module.
Fig. 7 is a schematic flowchart of a welding detection method according to another embodiment. The embodiment relates to a specific implementation process for detecting a welding state according to a pressure value generated by a transmission device. As shown in fig. 7, the method includes:
s701, acquiring a pressure value of pressure action of the welding wire on the transmission device when a welding head in the welding detection system is lifted.
Optionally, the welding detection device may obtain, through the pressure sensor, a pressure value of a pressure action that the welding wire is driven to generate on the transmission device when the welding head in the welding detection system is lifted, or obtain, through another pressure detector, a pressure value of a pressure action that the welding wire is driven to generate on the transmission device when the welding head in the welding detection system is lifted.
S702, comparing the pressure value with a preset pressure threshold value; if the pressure value is less than or equal to the preset pressure threshold, execute step 703; if the pressure value is greater than the preset pressure threshold, step 704 is executed.
Specifically, after the welding detection device obtains the pressure value of the pressure action generated by the welding wire to the transmission device when the welding head in the welding detection system is lifted, the pressure value of the pressure action generated by the welding wire to the transmission device is compared with a preset pressure threshold, if the pressure value of the pressure action generated by the welding wire to the transmission device is smaller than or equal to the preset pressure threshold, the welding state is determined to be a false welding, step 703 is executed, if the pressure value of the pressure action generated by the welding wire to the transmission device is larger than the preset pressure threshold, the welding state is determined to be a normal welding, and step 704 is executed.
And S703, determining that the welding state is cold joint.
Specifically, if the pressure value of the pressure generated by the welding wire on the transmission device is smaller than or equal to a preset pressure threshold value, the welding state is determined to be a cold joint. For example, if the preset pressure threshold is 0.6N, the pressure value for acquiring the pressure action of the bonding wire on the transmission device is 0.3N, and is smaller than the preset pressure threshold, it is determined that the bonding state is the cold joint.
And S703, determining that the welding state is normal welding.
Specifically, if the pressure value of the pressure generated by the welding wire on the transmission device is greater than a preset pressure threshold value, the welding state is determined to be normal. For example, if the preset pressure threshold is 0.6N, the pressure value for acquiring the pressure action of the welding wire on the transmission device is 0.7N, and is greater than the preset pressure threshold, it is determined that the welding state is normal.
In this embodiment, welding check out test set is through acquireing the pressure value of the pressure action that the welding wire produced transmission among the welding detecting system, the process of pressure value and the predetermined pressure threshold value detection welding state of the pressure action that produces transmission according to the welding wire is very simple, the efficiency of confirming welding state has been improved, can in time detect welding state after the welding is accomplished, can in time accomplish the rewelding after detecting the rosin joint and producing, reduce and avoid the rosin joint problem even, the security and the stability of power battery module are improved.
It should be understood that although the various steps in the flowcharts of fig. 5-7 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 5-7 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
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 express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A welding detection system, the system comprising: the device comprises a welding head, a transmission device and a detection device, wherein the detection device is fixed on the welding head, and the transmission device is connected with the detection device, wherein the detection device comprises a displacement detection device or a pressure detection device;
the transmission device is in contact connection with a welding wire, and one end of the welding wire is in contact connection with the welding head;
the detection device is used for detecting the welding state according to the pressure action of the welding wire on the transmission device generated by the welding wire when the welding head is lifted; the welding state comprises cold joint or normal welding; the generated pressure action includes a displacement amount of the transmission detected by the displacement detecting means or a pressure value of the transmission detected by the pressure detecting means.
2. The system of claim 1, wherein the detection device comprises a displacement detection device;
the displacement detection device is used for detecting the displacement of the transmission device when the welding wire generates pressure action on the transmission device, and detecting the welding state according to the displacement of the transmission device.
3. The system according to claim 2, characterized in that said displacement detection means are particularly adapted to detect said welding condition as a function of the displacement of said actuator and of a preset displacement threshold; if the displacement of the transmission device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint; and if the displacement of the transmission device is larger than the preset displacement threshold, determining that the welding state is normal.
4. The system of claim 1, wherein the detection device comprises a resilient device, a displacement detection device coupled to the resilient device;
the elastic device is used for driving the welding wire to generate displacement when the welding head is lifted to generate pressure action on the transmission device;
the displacement detection device is used for detecting the displacement of the elastic device and detecting the welding state according to the displacement of the elastic device.
5. The system according to claim 4, wherein the displacement detection device is specifically configured to detect the welding state according to a displacement amount of the elastic device and a preset displacement threshold; if the displacement of the elastic device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint; and if the displacement of the elastic device is larger than the preset displacement threshold, determining that the welding state is normal.
6. The system of claim 1, wherein the detection device comprises a pressure detection device;
the pressure detection device is used for detecting a pressure value of pressure action generated by the welding wire on the transmission device when a welding head in the welding detection system is lifted, and detecting the welding state according to the pressure value.
7. The system according to claim 6, characterized in that said pressure detection means are in particular adapted to detect said welding state as a function of said pressure value and of a preset pressure threshold; if the pressure value is smaller than or equal to the preset pressure threshold value, determining that the welding state is a cold joint; and if the pressure value is larger than the preset pressure threshold value, determining that the welding state is normal.
8. A welding inspection method applied to the welding inspection system according to any one of claims 1 to 7, the method comprising:
detecting a welding state according to the pressure action of the welding wire on the transmission device generated by the lifting of a welding head in the welding detection system; the welding state comprises cold joint or normal welding; the pressure action generated by the transmission device comprises the displacement of the transmission device or the pressure value of the transmission device.
9. The method of claim 8, wherein detecting the welding condition based on a pressure action of the welding wire against the actuator when a welding head of the welding detection system is lifted comprises:
acquiring the displacement of a transmission device in the welding detection system under the pressure action;
comparing the displacement of the transmission device with a preset displacement threshold;
if the displacement of the transmission device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint;
and if the displacement of the transmission device is larger than the preset displacement threshold, determining that the welding state is normal.
10. The method of claim 8, wherein detecting the welding condition based on a pressure action of the welding wire against the actuator when a welding head of the welding detection system is lifted comprises:
acquiring the displacement of an elastic device in the welding detection system under the pressure action;
comparing the displacement of the elastic device with a preset displacement threshold;
if the displacement of the elastic device is smaller than or equal to the preset displacement threshold, determining that the welding state is a cold joint;
and if the displacement of the elastic device is larger than the preset displacement threshold, determining that the welding state is normal.
11. The method of claim 8, wherein detecting the welding condition based on a pressure action of the welding wire against the actuator when a welding head of the welding detection system is lifted comprises:
acquiring a pressure value of pressure action generated by the welding wire on the transmission device when a welding head in the welding detection system is lifted;
comparing the pressure value with a preset pressure threshold value;
if the pressure value is smaller than or equal to the preset pressure threshold value, determining that the welding state is a cold joint;
and if the pressure value is larger than the preset pressure threshold value, determining that the welding state is normal.
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| TWI717106B (en) | 2019-11-18 | 2021-01-21 | 財團法人工業技術研究院 | Welding quality detection system and method |
| CN113241502B (en) * | 2021-04-13 | 2022-12-27 | 珠海冠宇电池股份有限公司 | Insufficient solder detection method, insufficient solder detection device and preparation method of lithium battery |
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