CN113776938A - Method and device for testing connection performance of battery piece and welding strip - Google Patents
Method and device for testing connection performance of battery piece and welding strip Download PDFInfo
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- CN113776938A CN113776938A CN202111061195.7A CN202111061195A CN113776938A CN 113776938 A CN113776938 A CN 113776938A CN 202111061195 A CN202111061195 A CN 202111061195A CN 113776938 A CN113776938 A CN 113776938A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The application discloses a method and a device for testing connection performance of a battery piece and a welding strip. A1, providing a battery piece to be tested with a solder strip welded on the surface; a2, baking the battery piece at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, and T is more than or equal to 0.5h and less than or equal to 4 h; and A3, after the baked battery piece is cooled to room temperature, carrying out a peeling test on the welding strip on the battery piece to measure the tension between the battery piece and the welding strip. The test device comprises: the drying oven is used for baking the battery piece to be tested at a preset temperature for a preset time; the automatic tensile machine is used for carrying out a peeling test on the welding strip on the battery piece to be tested; and the computer system is internally provided with tension testing software and is in communication connection with the automatic tension machine, so that the automatic tension machine is controlled to perform tests through the tension testing software, and test data are recorded and analyzed.
Description
Technical Field
The application relates to the field of solar cells, in particular to a method and a device for testing the connection performance of a cell and a solder strip.
Background
Photovoltaic power generation is a novel green industry supported by the country, wherein a monocrystalline silicon battery piece is a core component of photovoltaic power generation. In practical application, the power generation effect of the battery piece is different under different application environments. In experiments, it is also found that the difference of the connection performance between the cell and the solder strip can also cause the difference of the power generation amount of the photovoltaic module, so that it is necessary to study the change of the connection performance between the cell and the solder strip in different application environments.
In the prior art, the aging of the cell is accelerated by some means, and then the change of the tension between the aged cell and the solder strip is detected to evaluate the reliability of the photovoltaic module. However, the existing test method has a limited application range.
Disclosure of Invention
In order to solve the defects of the prior art, an object of the present application is to provide a method for testing the connection performance of a battery plate and a solder strip, which is used for evaluating the change of the connection performance of the battery plate and the solder strip after high temperature is experienced.
Another object of the present application is to provide a method for evaluating the influence of environmental changes on the connection performance of a battery plate and a solder strip, which is used for finding the change trend of the connection performance of the battery plate and the solder strip at high temperature.
It is still another object of the present application to provide an apparatus for testing the connection performance of a battery cell to a solder ribbon, which is used to conveniently and quickly evaluate the change of the connection performance of the battery cell to the solder ribbon caused by high temperature.
In order to achieve the above object, the present application provides a method for testing connection performance between a battery piece and a solder strip, comprising the following steps:
a1, providing a battery piece to be tested, the surface of which is welded with a welding strip;
a2, baking the battery piece at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, and T is more than or equal to 0.5h and less than or equal to 4 h;
and A3, after the baked battery piece is cooled to room temperature, carrying out a peeling test on the welding strip on the battery piece to measure the tension between the battery piece and the welding strip.
In some embodiments, in the step a1, the battery piece to be tested is provided by the following method:
a11, connecting the bare cell and the solder strip with each other through a series welding machine to obtain a cell to be cut;
a12, cutting the battery piece obtained in the step A11 to obtain a plurality of independent battery pieces, and selecting the battery pieces which are not split or have no subfissure as the battery pieces to be tested.
In some embodiments, the peel test in step a3 comprises the steps of:
a31, providing a testing device, wherein the testing device comprises a grasping arm for grasping the solder strip and a computer system with built-in tension testing software;
a32, extending the solder strip on the battery piece, grabbing the solder strip by the grabbing arm, and reserving a buffer space of 3-10 mm between the solder strip and the grabbing arm after grabbing to prevent the solder strip from being tensioned before testing;
a33, starting the tension test software on the computer system, and enabling the battery plate to be relatively far away from the grabbing arm, wherein the tension test software measures the tension between the battery plate and the welding strip.
In some embodiments, the temperature in step A2 is 100 ℃. ltoreq.T.ltoreq.150 ℃.
The application also provides a method for evaluating the influence of environmental change on the connection performance of the battery piece and the welding strip, which comprises the following steps:
b1, providing a plurality of battery pieces to be tested with welding strips welded on the surfaces of the battery pieces in the same type;
b2, carrying out a peeling test on the welding strip on the battery piece to be tested to obtain the initial tension F0 of the battery piece and the welding strip;
b3, baking at least one battery piece to be tested at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, T is more than or equal to 0.5h and less than or equal to 4h, cooling the baked battery piece to room temperature, and then carrying out a peeling test on a welding strip on the battery piece to measure the tension Fn between the battery piece and the welding strip.
In some embodiments, the step B3 is specifically: respectively keeping a plurality of battery pieces at preset temperatures T1、T2、......、TnLower lapse of preset time t1、t2、......、tnBaking at 90 deg.C or less1＜T2＜......＜Tn≤170℃，0.5h≤t1、t2、......、tnNot more than 4h, after the baked battery piece is cooled to room temperature, a stripping test is carried out on the welding strip on the battery piece so as to measure the tension F between the battery piece and the welding strip1、F2、......、Fn。
In some embodiments, 0.5h ≦ tn≤......≤t2≤t1≤4h，100℃≤T1＜T2＜......＜Tn≤150℃。
In some embodiments, in the step B1, the battery piece to be tested is provided by the following method:
b11, connecting the battery plate bare chip and the welding strip with each other through a series welding machine to obtain a battery plate to be cut;
b12, cutting the battery piece obtained in the step B11 to obtain a plurality of independent battery pieces, and selecting the battery pieces which are not split or have no subfissure as the battery pieces to be tested.
The peel test in the steps B2 and B3 included the steps of:
providing a testing device, wherein the testing device comprises a grabbing arm for grabbing the welding strip and a computer system with built-in tension testing software;
extending the welding strip on the battery piece, grabbing the welding strip through the grabbing arm, and reserving a buffer space of 3-10 mm between the welding strip and the grabbing arm after grabbing to prevent the welding strip from being tensioned before testing;
and starting the tension test software on the computer system, and enabling the battery piece to be relatively far away from the grabbing arm, wherein the tension test software is used for measuring the tension between the battery piece and the welding strip.
The application still provides a device for testing battery piece and solder strip connection performance, includes:
the drying oven is used for baking the battery piece to be tested at a preset temperature for a preset time;
the automatic tensile machine is used for carrying out a peeling test on the welding strip on the battery piece to be tested;
and the computer system is internally provided with tension testing software and is in communication connection with the automatic tension machine, so that the automatic tension machine is controlled to perform a test through the tension testing software, and test data is recorded and analyzed.
In some embodiments, the oven comprises a box body, a hot air supply device, a temperature adjusting device and a timing device, the box body is provided with a containing cavity for placing the battery piece, the containing cavity is internally provided with at least one layer of platform for placing the battery piece, the box body is also provided with an air hole, high-temperature gas generated by the hot air supply device is blown into the containing cavity through the air hole, the box body is provided with a box door, the containing cavity is opened or closed through the box door, the temperature adjusting device adjusts the temperature in the containing cavity by controlling the hot air supply device, and the timing device is used for controlling the working time of the hot air supply device;
the automatic tensile machine comprises a mounting platform and a grabbing arm, wherein the mounting platform is used for fixedly mounting the battery piece to be tested, the grabbing arm is used for grabbing a welding strip on the battery piece, and the mounting platform and the grabbing arm are suitable for relative displacement to enable the welding strip to be stripped from the surface of the battery piece when the automatic tensile machine works.
Compared with the prior art, the beneficial effect of this application lies in:
(1) compared with the conventional method for testing the tensile force of the welding strip of the battery piece, the method is mainly used for testing the tensile force between the battery piece and the welding strip after the battery piece is subjected to the high temperature of 90-170 ℃. The baking temperature of 90-170 ℃ is close to the temperature experienced by the photovoltaic module during lamination, so that the testing method can simulate the tension value between the cell and the solder strip after the photovoltaic module passes through the lamination process, and is favorable for accurately judging the tension between the cell and the solder strip in the final product;
(2) the evaluation method can be used for evaluating whether the connection performance between the battery piece and the welding strip can be enhanced or reduced after the photovoltaic module passes through the lamination process, and therefore the method can be used for judging the matching performance between the battery piece and the welding strip, is beneficial to selecting the combination of the battery piece with better matching performance and the welding strip, and further prevents poor connection between the battery piece and the welding strip in the preparation process of the photovoltaic module.
(3) The test device provided by the application is suitable for the test method and the evaluation method provided by the application, is convenient to operate and is low in implementation cost. The method is beneficial to the mass implementation of the test method and the evaluation method.
Drawings
FIG. 1 shows a schematic view of one embodiment of an oven unit of the present application;
FIG. 2 shows a schematic view of one embodiment of an auto-tensioner of the present application;
in the figure: 1. an oven; 11. a box body; 110. an accommodating chamber; 111. a wind hole; 112. a box door; 113. a display screen; 114. a partition plate; 12. a temperature adjustment device; 13. a timing device; 2. an automatic tensile machine; 21. mounting a platform; 22. and pulling the grabbing arm.
Detailed Description
The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The difference of the connection performance of the cell and the solder strip can cause the difference of the power generation amount of the photovoltaic module, so that the evaluation of the connection performance of the cell and the solder strip is of great significance. The inventor of the present application finds that after the cell is welded to the solder strip, the cell may be subjected to various high temperature environments, for example, when the photovoltaic module is laminated or when the photovoltaic module is actually used, the cell may be subjected to high temperature, and the high temperature environment may affect the connection performance between the cell and the solder strip. Moreover, after the adhesive film of the photovoltaic module is subjected to high temperature, the stress direction may change and then move, which may drive the solder strip to move, thereby affecting the performance of the photovoltaic module. However, in the prior art, how high temperature affects the connection performance of the battery piece and the welding strip is not evaluated, especially continuous stress changes of the battery piece and the welding strip in a high-temperature environment. Based on the above, the inventor of the present application provides a method and a system for testing the connection performance of a battery piece and a solder strip, which are mainly used for evaluating the influence of high temperature on the connection performance of the battery piece and the solder strip, and further provides a method for evaluating the influence of environmental change on the connection performance of the battery piece and the solder strip.
The application firstly provides a method for testing the connection performance of a battery piece and a welding strip, which comprises the following steps:
a1, providing a battery piece to be tested, the surface of which is welded with a welding strip;
a2, baking the battery piece at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, and T is more than or equal to 0.5h and less than or equal to 4 h;
and A3, after the baked battery piece is cooled to room temperature, carrying out a peeling test on the welding strip on the battery piece to measure the tension between the battery piece and the welding strip.
Compared with the conventional method for testing the tensile force of the welding strip of the battery piece, the method is mainly used for testing the tensile force between the battery piece and the welding strip after the battery piece is subjected to the high temperature of 90-170 ℃. The baking temperature of 90-170 ℃ is close to the temperature experienced by the photovoltaic module during lamination, so that the testing method can simulate the tension value between the cell and the solder strip after the photovoltaic module passes through the lamination process, and is favorable for accurately judging the tension between the cell and the solder strip in the final product.
In some embodiments, in step a1, the battery piece to be tested is provided by the following method:
a11, connecting the bare cell and the solder strip with each other through a series welding machine to obtain a cell to be cut;
a12, cutting the battery piece obtained in the step A11 to obtain a plurality of independent battery pieces, and selecting the battery pieces which are not split or have no subfissure as the battery pieces to be tested.
The waste of the battery piece can be avoided by testing the cut battery piece. It should be noted that in step a11, the battery piece welded by the series welding machine needs to be judged as a battery piece without abnormal welding, and then the battery piece is taken out from the series welding machine after being cooled and welded and fixed with the welding strip. When the step A12 is cut, attention should be paid to the fact that the cell is not cracked or hidden cracked due to external reasons, particularly the cell which passes through the testing section of the main grid.
In other embodiments, the peel test in step a3 includes the steps of:
a31, providing a testing device, wherein the testing device comprises a grabbing arm for grabbing the solder strip and a computer system with built-in tension testing software;
a32, extending the solder strip on the battery piece, grabbing the solder strip through a grabbing arm, and reserving a buffer space of 3-10 mm between the grabbed solder strip and the grabbing arm to prevent the solder strip from being tensioned before the test;
and A33, starting tension test software on the computer system, and enabling the battery plate to be relatively far away from the grabbing arm, wherein the tension test software measures the tension between the battery plate and the welding strip.
The tensile test software can preset a cell testing method according to the cell model and the grid line information, and can judge data generated in the testing process after the test is started.
In the step a32, in order to avoid a test error of the tension between the head main grid section caused by the tight space between the solder strip and the battery piece when the grab arm is connected with the solder strip, attention needs to be paid to a buffer space of 3 mm-10 mm between the solder strip and the grab arm after the test device is started during connection. In step a32, the solder strip on the battery piece may be extended by various means, such as connecting one end of the solder strip to a wire, to achieve the purpose of extending the solder strip.
In some embodiments, solder strips are welded on the front side and the back side of the cell, and in step a3, the tension between the front side of the cell and the corresponding solder strip and the tension between the back side of the cell and the corresponding solder strip are respectively tested.
In some embodiments, in step A2, T is 100 ℃. ltoreq.T.ltoreq.150 ℃.
The application also provides a method for evaluating the influence of environmental change on the connection performance of the battery piece and the welding strip, which comprises the following steps:
b1, providing a plurality of battery pieces to be tested with welding strips welded on the surfaces of the battery pieces in the same type;
b2, carrying out a peeling test on the welding strip on a battery piece to be tested to obtain the initial tension F0 of the battery piece and the welding strip;
b3, baking at least one battery piece to be tested at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, T is more than or equal to 0.5h and less than or equal to 4h, and the baked battery piece is cooledAfter cooling to room temperature, carrying out a peeling test on the welding strip on the battery piece to measure the tensile force F between the battery piece and the welding stripn。
With the above evaluation method, the inventors found that before and after the high-temperature baking, the connection performance between different types of battery pieces and the solder strip has different trends, and the connection performance between some types of battery pieces and the solder strip is reduced, but the connection performance between other types of battery pieces and the solder strip may be improved. The inventors have analyzed that it is possible that the properties of the electrode paste are amplified by the high temperature, some pastes show an increased bonding to the solder ribbon after the high temperature, while others show a weaker resistance to sustained high temperatures, which results in a solder ribbon that is more easily peeled off.
The evaluation method can be used for evaluating whether the connection performance between the battery piece and the welding strip can be enhanced or reduced after the photovoltaic module passes through the lamination process, and therefore the method can be used for judging the matching performance between the battery piece and the welding strip, is beneficial to selecting the combination of the battery piece with better matching performance and the welding strip, and further prevents poor connection between the battery piece and the welding strip in the preparation process of the photovoltaic module.
In some embodiments, step B3 is specifically: respectively putting a plurality of battery pieces at preset temperatures T1、T2、......、TnLower lapse of preset time t1、t2、......、tnBaking at 90 deg.C or less1＜T2＜......＜Tn≤170℃，0.5h≤t1、t2、......、tnNot more than 4h, after the baked battery piece is cooled to room temperature, the welding strip on the battery piece is subjected to a peeling test to measure the tension F between the battery piece and the welding strip1、F2、......、Fn。
The evaluation method can analyze the change of the connection performance of the battery piece and the welding strip after the battery piece is subjected to each temperature interval and each time period, so that the fluctuation of the connection performance of the battery piece and the welding strip caused by actual temperature difference can be effectively monitored.
It is worth mentioning that the battery piece can be used in high temperature environment for a long timeSevere degradation occurs which is detrimental to accurately determining what effect temperature has on connection performance over a short period of time, therefore, when T1、......TnAt higher temperatures, t1、......tnThe time is not suitable to be too long. In some embodiments, 0.5h ≦ tn≤......≤t2≤t1≤4h。
In some embodiments, in step B3, T is 100 ℃ ≦ T1＜T2＜......＜Tn≤150℃。
In some embodiments, in step B1, the battery piece to be tested is provided by:
b11, connecting the battery plate bare chip and the welding strip with each other through a series welding machine to obtain a battery plate to be cut;
b12, cutting the battery piece obtained in the step B11 to obtain a plurality of independent battery pieces, and selecting the battery pieces which are not split or have no subfissure as the battery pieces to be tested.
The peel test in step B2 and step B3 included the following steps:
providing a testing device, wherein the testing device comprises a grabbing arm for grabbing the welding strip and a computer system with built-in tension testing software;
extending the solder strip on the battery piece, grabbing the solder strip through a grabbing arm, and reserving a buffer space of 3-10 mm between the grabbed solder strip and the grabbing arm to prevent the solder strip from being tensioned before the test;
and starting tension testing software on a computer system, relatively keeping the battery plate away from the grabbing arm, and testing the tension between the battery plate and the welding strip by the tension testing software.
In some embodiments, solder strips are welded on the front side and the back side of the cell piece, and in steps B2 and B3, the tension between the front side of the cell piece and the corresponding solder strip and the tension between the back side of the cell piece and the corresponding solder strip are tested, respectively.
The application also provides a device for testing the connection performance of the battery piece and the welding strip, which comprises an oven 1, an automatic tensile machine 2 and a computer system. The drying oven 1 is used for baking the battery piece to be tested at a preset temperature for a preset time; the automatic tensile machine 2 is used for carrying out a peeling test on the welding strip on the battery piece to be tested; the computer system is internally provided with tension testing software and is in communication connection with the automatic tension machine, so that the automatic tension machine is controlled to perform tests through the tension testing software, and test data are recorded and analyzed.
As shown in fig. 1, oven 1 includes a housing 11, a hot air supply device (not shown), a temperature adjustment device 12, and a timing device 13. The box body 11 is provided with a containing cavity 110 for containing the battery piece, at least one layer of platform for containing the battery piece is arranged in the containing cavity 110, an air hole 111 is further formed in the box body 11, high-temperature gas generated by the hot air supply device is blown into the containing cavity 110 through the air hole 111, a box door 112 is arranged on the front side of the box body 11, and the containing cavity 110 is opened or closed through the box door 112. The temperature adjusting device 12 adjusts the temperature in the accommodating chamber 110 by controlling the hot air supply device. The timer 13 is used to control the operation time of the hot air supply device.
In some embodiments, the outer surface of the box 11 is further provided with a display screen 113, and the display screen 113 is used for displaying the real-time temperature in the accommodating cavity 110 and displaying the working time of the oven unit 1. Of course, the display 113 can also be connected to the thermostat 12 and the timer 13 for displaying the temperature set by the thermostat 12 and the time set by the timer 13.
As shown in fig. 2, the automatic tensile machine 2 includes a mounting platform 21 and a grasping arm 22, the mounting platform 21 is used for fixedly mounting the battery piece to be tested, the grasping arm 22 is used for grasping the solder strip on the battery piece, and the mounting platform 21 and the grasping arm 22 are adapted to be displaced relatively, so that the solder strip is peeled off from the surface of the battery piece when the automatic tensile machine 2 is in operation. Data from the auto tensile machine 2 test is collected by a computer system.
In some embodiments, the housing 11 has multiple layers of partitions 114 therein for housing the battery cells.
In some embodiments, the box 11 is provided with a plurality of wind holes 111, and the plurality of wind holes 111 are uniformly distributed on the rear wall of the box 11.
In some embodiments, thermostat 12 includes an adjustment knob disposed on an outer surface of housing 11.
In some embodiments, the timing device 13 includes an adjustment knob disposed on an outer surface of the housing 11.
In some embodiments, the mounting platform 21 of the automatic tensile machine 2 is adapted to mount a plurality of battery pieces to be tested at one time, and the automatic tensile machine 2 includes a plurality of grab arms, so that the automatic tensile machine 2 of the present application can perform a solder strip peeling test on the plurality of battery pieces to be tested at one time.
[ example 1 ]
Providing a battery piece bare chip A of a manufacturer A, respectively welding strips L of the same manufacturer and style on the front surface and the back surface of the battery piece bare chip A, cutting after welding to obtain a plurality of battery pieces a with welding strips welded on the surfaces, and performing welding strip extending operation on each battery piece a to facilitate subsequent tension test.
Taking three battery pieces a, respectively carrying out peeling tests on the welding strips on the front surface and the back surface of each battery piece a by using an automatic tensile machine 2, averaging the three test results to obtain the initial tensile force F0 of the battery piece a, and recording the results in table 1.
Taking three battery pieces a, putting the battery pieces a into an oven, baking the battery pieces a for 4 hours at 100 ℃, then cooling the battery pieces to room temperature, respectively carrying out peeling tests on the welding strips on the front side and the back side of the battery pieces by using an automatic tensile machine 2, and averaging the three test results to obtain the tensile force F1 after the battery pieces a are baked, wherein the results are recorded in the table 1.
Taking three battery pieces a, putting the battery pieces a into an oven, baking the battery pieces a for 0.5 hour at the temperature of 150 ℃, cooling the battery pieces to room temperature, respectively carrying out peeling tests on the welding strips on the front surface and the back surface of the battery pieces by using an automatic tensile machine 2, averaging the three test results to obtain the tensile force F2 after the battery pieces a are baked, and recording the results in table 1.
[ example 2 ]
Example 2 differs from example 1 in that: and (3) respectively welding the same welding strips L as in the embodiment 1 on the front surface and the back surface of the battery piece bare chip B by using the battery piece bare chip B manufactured by the manufacturer B, and cutting after welding to obtain a plurality of battery pieces B with welding strips welded on the surfaces.
TABLE 1
From the above experimental data, it can be found that as the baking temperature increases, the tension between the front surface of the battery piece a and the solder strip gradually decreases, while the tension between the back surface of the battery piece a and the solder strip increases, but does not change linearly. And with the increase of the baking temperature, the battery piece b shows the opposite trend, the tension between the front surface of the battery piece b and the welding strip is gradually increased, and the tension between the battery piece b and the welding strip is gradually reduced.
The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.
Claims (10)
1. A method for testing the connection performance of a battery piece and a welding strip is characterized by comprising the following steps:
a1, providing a battery piece to be tested, the surface of which is welded with a welding strip;
a2, baking the battery piece at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, and T is more than or equal to 0.5h and less than or equal to 4 h;
and A3, after the baked battery piece is cooled to room temperature, carrying out a peeling test on the welding strip on the battery piece to measure the tension between the battery piece and the welding strip.
2. The method for testing the connection performance of the battery piece and the solder strip according to claim 1, wherein in the step A1, the battery piece to be tested is provided by the following method:
a11, connecting the bare cell and the solder strip with each other through a series welding machine to obtain a cell to be cut;
a12, cutting the battery piece obtained in the step A11 to obtain a plurality of independent battery pieces, and selecting the battery pieces which are not split or have no subfissure as the battery pieces to be tested.
3. The method for testing the connection performance of the battery piece and the solder strip as claimed in claim 1 or 2, wherein the peeling test in the step A3 comprises the following steps:
a31, providing a testing device, wherein the testing device comprises a grasping arm for grasping the solder strip and a computer system with built-in tension testing software;
a32, extending the solder strip on the battery piece, grabbing the solder strip by the grabbing arm, and reserving a buffer space of 3-10 mm between the solder strip and the grabbing arm after grabbing to prevent the solder strip from being tensioned before testing;
a33, starting the tension test software on the computer system, and enabling the battery plate to be relatively far away from the grabbing arm, wherein the tension test software measures the tension between the battery plate and the welding strip.
4. The method for testing the connection performance of the battery piece and the solder strip as claimed in claim 1, wherein in the step A2, T is more than or equal to 100 ℃ and less than or equal to 150 ℃.
5. A method for evaluating the influence of environmental change on the connection performance of a battery plate and a welding strip is characterized by comprising the following steps:
b1, providing a plurality of battery pieces to be tested with welding strips welded on the surfaces of the battery pieces in the same type;
b2, carrying out a peeling test on the welding strip on the battery piece to be tested to obtain the initial tension F of the battery piece and the welding strip0；
B3, baking at least one battery piece to be tested at a preset temperature T for a preset time T, wherein T is more than or equal to 90 ℃ and less than or equal to 170 ℃, T is more than or equal to 0.5h and less than or equal to 4h, cooling the baked battery piece to room temperature, and then carrying out a peeling test on a welding strip on the battery piece to test the electricityTension F between the pool sheet and the solder stripn。
6. The method for evaluating the influence of environmental changes on the connection performance of the battery plate and the solder strip as claimed in claim 5, wherein the step B3 is specifically as follows: respectively keeping a plurality of battery pieces at preset temperatures T1、T2、......、TnLower lapse of preset time t1、t2、......、tnBaking at 90 deg.C or less1＜T2＜......＜Tn≤170℃，0.5h≤t1、t2、......、tnNot more than 4h, after the baked battery piece is cooled to room temperature, a stripping test is carried out on the welding strip on the battery piece so as to measure the tension F between the battery piece and the welding strip1、F2、......、Fn。
7. The method for evaluating the influence of environmental changes on the connection performance of a battery plate and a welding strip as claimed in claim 6, wherein t is 0.5h ≦ tn≤......≤t2≤t1≤4h，100℃≤T1＜T2＜......＜Tn≤150℃。
8. The method for evaluating the influence of environmental changes on the connection performance of a battery piece and a welding strip according to any one of claims 5-7, wherein in the step B1, the battery piece to be tested is provided by the following method:
b11, connecting the battery plate bare chip and the welding strip with each other through a series welding machine to obtain a battery plate to be cut;
b12, cutting the battery piece obtained in the step B11 to obtain a plurality of independent battery pieces, and selecting a battery piece which is not split or has no subfissure as the battery piece to be tested;
the peel test in the steps B2 and B3 included the steps of:
providing a testing device, wherein the testing device comprises a grabbing arm for grabbing the welding strip and a computer system with built-in tension testing software;
extending the welding strip on the battery piece, grabbing the welding strip through the grabbing arm, and reserving a buffer space of 3-10 mm between the welding strip and the grabbing arm after grabbing to prevent the welding strip from being tensioned before testing;
and starting the tension test software on the computer system, and enabling the battery piece to be relatively far away from the grabbing arm, wherein the tension test software is used for measuring the tension between the battery piece and the welding strip.
9. An apparatus for testing the connection performance of a battery plate and a solder strip, comprising:
the drying oven is used for baking the battery piece to be tested at a preset temperature for a preset time;
the automatic tensile machine is used for carrying out a peeling test on the welding strip on the battery piece to be tested;
and the computer system is internally provided with tension testing software and is in communication connection with the automatic tension machine, so that the automatic tension machine is controlled to perform a test through the tension testing software, and test data is recorded and analyzed.
10. The apparatus for testing the connection performance of the battery plate and the solder strip according to claim 9, wherein the oven comprises a box body, a hot air supply device, a temperature adjusting device and a timing device, the box body is provided with a containing cavity for placing the battery plate, the containing cavity is provided with at least one layer of platform for placing the battery plate, the box body is further provided with an air hole, high-temperature gas generated by the hot air supply device is blown into the containing cavity through the air hole, the box body is provided with a box door, the containing cavity is opened or closed through the box door, the temperature adjusting device adjusts the temperature in the containing cavity by controlling the hot air supply device, and the timing device is used for controlling the working time of the hot air supply device;
the automatic tensile machine comprises a mounting platform and a grabbing arm, wherein the mounting platform is used for fixedly mounting the battery piece to be tested, the grabbing arm is used for grabbing a welding strip on the battery piece, and the mounting platform and the grabbing arm are suitable for relative displacement to enable the welding strip to be stripped from the surface of the battery piece when the automatic tensile machine works.
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