A method and device for detecting the quality of lithium battery glue filling

Abstract

The present invention provides a method and a detection device for detecting the quality of glue filling of a lithium battery. The detection device is used for detecting and evaluating the quality of glue filling of a glue filling layer (12) of an aluminum plate (11) of a lithium battery assembly (10). The detection device comprises a permanent magnet (21) and a magnetic sensitive element (22). The permanent magnet (21) and the magnetic sensitive element (22) are arranged in sequence in a detection scanning moving direction (v). The magnetic sensitive element (22) detects the residual magnetic parameter value of the preceding permanent magnet (21). The method realizes the quality analysis and evaluation of the glue filling of the packaging in the new energy power lithium battery assembly through simple residual magnetic detection.

Description

Technical Field

[0001] The present invention relates to electromagnetic nondestructive testing, and in particular to a technical solution for determining the quality of lithium battery assembly packaging glue filling through electromagnetic nondestructive testing, and in particular to a lithium battery glue filling quality detection method and detection device. Background Art

[0002] With the continuous development and popularization of new energy technologies, various new energy batteries have emerged like mushrooms after rain. The use of batteries in different products requires multiple battery cells to be packaged into a whole battery pack due to the differences in electrical parameters and volume structure design. In the specific production process, the packaging and glue filling technology of the battery combination is an important part to ensure the safe charging and discharging of the battery.

[0003] At present, the more mature quality inspection of packaging glue potting mostly adopts X-ray inspection or ultrasonic inspection. The former may cause harm to the human body due to radioactive issues, and it is not easy to evaluate. The latter requires the use of coupling agent, but most of the production does not allow any coupling agent, so it is difficult to popularize and apply (if air coupling is used, the cost is too high and the efficiency is low).

[0004] In view of the above shortcomings, the present invention adopts the following technical solutions. Summary of the invention

[0005] The purpose of the present invention is to provide a method and a device for detecting the quality of lithium battery glue filling, and the disclosed technical solution is as follows:

[0006] A method for detecting the quality of lithium battery glue filling, which is usually used in the production process of new energy lithium batteries. In the lithium battery combination aluminum plate packaging glue filling, the method for detecting and evaluating the glue filling quality is characterized by using a permanent magnet to magnetize the packaging filling colloid, and a magnetic sensitive element to detect the residual magnetic field strength to determine whether there is a bad gap in the colloid. The specific method steps are as follows: a. Detection device combination: select a permanent magnet and a magnetic sensitive element combination, and select an appropriate detection device combination according to the actual volume shape of the lithium battery combination or the specific parameter thickness of the packaging filling;

[0007] b. Calibration of residual magnetic parameters: According to the thickness of the aluminum plate and the glue layer in the aluminum plate packaging of the lithium battery, the standard value of the detection device combination is calibrated; the standard value can be set by using the standard lithium battery combination as a test block, or by using the standard specifications of the aluminum plate and glue layer parameters of the lithium battery combination, and the method of calculating the magnetic flux or magnetic field strength by the cross-sectional area of ​​the ferromagnetic metal magnet. For example, by the formula Br = Ф / N / S, Br is the residual magnetic field strength, Ф is the magnetic flux, N is the number of turns of the magnetic sensitive element coil, and S is the cross-sectional area of ​​the magnetic material, the magnetic field strength or magnetic flux is calculated; (usually the residual magnetic parameter measurement can be one of the magnetic field strength and magnetic flux).

[0008] c. Actual scanning and testing: According to the parameters of the magnetic parameter standard values ​​calibrated by the detection device combination, select the actual measurement parameters, perform mobile scanning and testing on the aluminum plate surface of the lithium battery combination to be tested, and record the residual magnetic parameter data calculated and tested;

[0009] d. Calculation and analysis: Compare and analyze the residual magnetic parameter data actually detected in step c with the residual magnetic parameter standard value calculated and set in step b to determine the degree of encapsulation glue filling. Usually, in the comparative analysis, the percentage calculation is used. If it is within a certain range of the standard value, it is judged that the glue filling is qualified. If it exceeds the range, the glue filling is unqualified.

[0010] Furthermore, the residual magnetic parameter calibration in step b is to calibrate and calculate the standard value of the residual magnetic parameter of a single surface, that is, a single surface of the lithium battery combination that can be continuously scanned is used as the standard value. Similarly, in the actual scanning and detection in step c, the parameter value of a single detection surface is calculated during the detection.

[0011] Furthermore, the calculation of the residual magnetism parameter value of a single detection surface also includes the merging of the detection values ​​detected by multiple detection device arrays, that is, the residual magnetism parameter values ​​after multiple detection devices detect a single detection surface are superimposed into a parameter value of a surface, or a magnetic induction imaging diagram is formed to analyze the specific value of the residual magnetism parameter.

[0012] Furthermore, it also includes combining the residual magnetic parameter values ​​of a single detection surface calculated during multiple detections as a pass rate determination for the entire lithium battery assembly packaging and glue filling.

[0013] Furthermore, the detection device combination is a bar permanent magnet and a magnetic sensitive element arranged in a front-to-back arrangement in the moving direction (v). During the detection process, the detection device combination moves in the moving direction (v), the permanent magnet moves first, and the magnetic sensitive element in the rear row in the moving direction (v) detects the residual magnetic parameter value remaining in the colloid. The residual magnetic parameter value can be a kind of residual magnetic field strength or magnetic flux, which is based on the calibration value and the parameter measured by the magnetic sensitive element.

[0014] Furthermore, the detection device combination is a combination of a U-shaped permanent magnet and a magnetic sensitive element, the two U-shaped feet of the U-shaped permanent magnet are arranged to move forward and backward in the moving direction (v), and the magnetic sensitive element is arranged on a straight line between the two U-shaped feet of the U-shaped permanent magnet. During the detection process, the detection device combination moves in the moving direction (v), and the magnetic sensitive element detects the residual magnetic parameter value remaining in the colloid in the moving direction (v).

[0015] Furthermore, the detection device is a combination of a U-shaped permanent magnet and a pickup detection coil disposed on one or both of the two U-shaped legs of the U-shaped permanent magnet. The detection coil may be attached to the U-shaped leg surface of the U-shaped permanent magnet, or wound around the U-shaped leg. A preferred embodiment is to be disposed on the rear U-shaped leg of the two U-shaped legs in the moving direction v, so as to realize the evaluation and judgment of the quality of the lithium battery glue filling by simply winding the coil.

[0016] The present invention also discloses a device for detecting the quality of glue filling of a lithium battery. The device is used for detecting and evaluating the quality of glue filling of a glue filling layer (12) encapsulated on an aluminum plate (11) of a lithium battery assembly (10). The device comprises a permanent magnet (21) and a magnetic sensitive element (22). The device is characterized in that the permanent magnet (21) and the magnetic sensitive element (22) are arranged in sequence in a detection scanning moving direction (v), and the magnetic sensitive element (22) detects the residual magnetic parameter value of the preceding permanent magnet (21).

[0017] Furthermore, the permanent magnet (21) is a strip-shaped or U-shaped permanent magnet, and the magnetic sensitive element (22) is arranged at the rear of the strip-shaped permanent magnet (21) in the moving direction, or at the rear U-shaped foot of the U-shaped permanent magnet in the moving direction.

[0018] Furthermore, the detection device comprises an array of multiple permanent magnets (21) and magnetic sensitive elements (22), which are adapted to the width of the detection surface to form an array detection sensor device. It can be adapted to detect one surface of the lithium battery, or to detect two surfaces, or to detect four surfaces or six surfaces at the same time. According to different needs, an array detection sensor combination device is set, and a large area is scanned at the same time, and comprehensive data analysis and calculation are performed. By scanning the area, the coverage rate of the lithium battery aluminum plate encapsulation glue is calculated to determine the qualified rate.

[0019] According to the above technical scheme, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a method and device for detecting the quality of lithium battery glue filling, especially a technical solution for determining whether there are bad gaps in the colloid by magnetizing the colloid containing ferromagnetic particles with a permanent magnet and detecting the residual magnetic field strength with a magnetic sensitive element. The method can realize the quality analysis and evaluation of the glue filling in the new energy power lithium battery combination through simple residual magnetism detection;

[0021] 2. The present invention provides a lithium battery filling quality inspection method, in which a permanent magnet is first implemented in the structure to allow residual magnetism to exist in the colloid, and then a magnetic sensitive element is used for inspection, so that information on the degree of sealing coverage can be obtained as a criterion for qualified or unqualified, thereby realizing a more convenient inspection method.

[0022] 3. A lithium battery glue filling quality detection device of the present invention can also adopt a method of embedding magnetic sensitive elements in the magnetic yoke, and form an array through multiple magnetic sensitive elements to obtain an imaging image, thereby realizing simultaneous detection and analysis and evaluation of a large area. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the use status of the detection device of the best embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the combined state of the detection device of the best embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the combined state of the detection device of the best embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the combined state of the detection device of the best embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the combined state of the detection device of the best embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the combined structure of the detection device of the best embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the combined structure of the detection device according to the best embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figures 1 to 5 As shown, a method for detecting the quality of lithium battery glue filling is generally used in the production process of new energy lithium batteries. A plurality of battery cells 13 are encapsulated in a lithium battery assembly 10 and an aluminum plate 11 is encapsulated in glue filling. The method for detecting and evaluating the quality of the glue filling layer 12 is a technical method for determining whether there are bad gaps 121 in the colloid by magnetizing the encapsulated glue filling layer 12 with a permanent magnet 21 and detecting the residual magnetic field strength with a magnetic sensitive element 22. The specific method steps are as follows:

[0032] a. Detection device combination: select a combination of permanent magnets and magnetic sensitive elements, and select an appropriate detection device combination based on the actual volume and shape of the lithium battery combination or the specific parameters and thickness of the packaging and glue filling;

[0033] b. Calibration of residual magnetic parameters: According to the thickness of the aluminum plate and the glue layer in the aluminum plate packaging of the lithium battery, the standard value of the detection device combination is calibrated; the standard value can be set by using the standard lithium battery combination as a test block, or by using the standard specifications of the aluminum plate and glue layer parameters of the lithium battery combination, and the method of calculating the magnetic flux or magnetic field strength by the cross-sectional area of ​​the ferromagnetic metal magnet. For example, by the formula Br = Ф / N / S, Br is the residual magnetic field strength, Ф is the magnetic flux, N is the number of turns of the magnetic sensitive element coil, and S is the cross-sectional area of ​​the magnetic material, the magnetic field strength or magnetic flux is calculated; (usually the residual magnetic parameter measurement can be one of the magnetic field strength and magnetic flux).

[0034] c. Actual scanning and testing: According to the parameters of the magnetic parameter standard values ​​calibrated by the detection device combination, select the actual measurement parameters, perform mobile scanning and testing on the aluminum plate surface of the lithium battery combination to be tested, and record the residual magnetic parameter data calculated and tested;

[0035] d. Calculation and analysis: Compare and analyze the residual magnetic parameter data actually detected in step c with the residual magnetic parameter standard value calculated and set in step b to determine the degree of encapsulation glue filling. Usually, in the comparative analysis, the percentage calculation is used. If it is within a certain range of the standard value, it is judged that the glue filling is qualified. If it exceeds the range, the glue filling is unqualified.

[0036] Among them, the residual magnetic parameter calibration in step b is to calibrate and calculate the standard value of the residual magnetic parameter of a single surface, that is, the single surface of the lithium battery combination that can be continuously scanned is used as the standard value of the standard. Similarly, in the actual scanning and detection in step c, the parameter value of a single detection surface is calculated during the detection.

[0037] In calculating the residual magnetism parameter value of a single detection surface, it also includes combining the detection values ​​detected by multiple detection device arrays, that is, the residual magnetism parameter values ​​after multiple detection devices detect a single detection surface are superimposed into a parameter value of a surface, or a magnetic induction imaging diagram is formed to analyze the specific value of the residual magnetism parameter.

[0038] It also includes the residual magnetic parameter value of a single test surface calculated when combining multiple tests, which is used as the qualified rate judgment of the entire lithium battery combination packaging and glue filling.

[0039] like Figure 2 As shown, the detection device combination 20 is a bar permanent magnet 21 and a magnetic sensitive element 22 arranged in a front-to-back arrangement in the moving direction (v). During the detection process, the detection device combination moves in the moving direction (v), the permanent magnet moves first, and the magnetic sensitive element in the rear row in the moving direction (v) detects the residual magnetic parameter value remaining in the colloid. The residual magnetic parameter value can be a kind of residual magnetic field strength or magnetic flux, which is based on the calibration value and the parameter measured by the magnetic sensitive element.

[0040] like Figure 3As shown, the detection device combination 20 is a combination of a U-shaped permanent magnet 21 and a magnetic sensitive element 22. The two U-shaped legs of the U-shaped permanent magnet 21 are arranged to move forward and backward in the moving direction (v), and the magnetic sensitive element is arranged on a straight line between the two U-shaped legs of the U-shaped permanent magnet. During the detection process, the detection device combination moves in the moving direction (v), and the magnetic sensitive element detects the residual magnetic parameter value remaining in the colloid in the moving direction (v).

[0041] like Figure 5 As shown in the figure, the detection device assembly 20 is a U-shaped permanent magnet 21 and a pickup detection coil 23 arranged on one or both of the two U-shaped legs of the U-shaped permanent magnet 21. It can be attached to the U-shaped leg surface of the U-shaped permanent magnet 21, or wound around the U-shaped leg. The preferred embodiment is to be arranged on the rear U-shaped leg of the two U-shaped legs in the moving direction v, so as to realize the evaluation and judgment of the quality of lithium battery glue filling by simply winding the coil.

[0042] like Figures 1 to 7 As shown, the present invention also discloses a detection device for the glue filling quality of a lithium battery. The detection device is used to detect and evaluate the glue filling quality of the glue filling layer 12 encapsulated on the aluminum plate 11 of the lithium battery assembly 10, and includes a permanent magnet 21 and a magnetic sensitive element 22. The permanent magnet 21 and the magnetic sensitive element 22 are arranged in sequence in the detection scanning moving direction v, and the magnetic sensitive element 22 detects the residual magnetic parameter value of the preceding permanent magnet 21.

[0043] like Figures 2 to 5As shown, the permanent magnet 21 is a kind of long strip or U-shaped permanent magnet, and the magnetic sensitive element 22 is arranged at the rear of the long strip permanent magnet 21 in the moving direction, or at the rear U-shaped foot of the U-shaped permanent magnet in the moving direction. As in one embodiment of 2, the detection device combination 20 is a combination of a strip permanent magnet 21 and a magnetic sensitive element 22 arranged in a front-to-back arrangement in the moving direction (v). During the detection process, the detection device combination moves in the moving direction (v), the permanent magnet goes first, and the magnetic sensitive element in the rear row in the moving direction (v) detects the residual magnetic parameter value remaining in the colloid; as in one embodiment of 3, the detection device combination 20 is a combination of a U-shaped permanent magnet 21 and a magnetic sensitive element 22, the two U-shaped feet of the U-shaped permanent magnet 21 are arranged in a front-to-back direction in the moving direction (v), and the magnetic sensitive element is arranged on a straight line between the two U-shaped feet of the U-shaped permanent magnet. During the detection process, the detection device combination moves in the moving direction (v). The detection device assembly 20 is a U-shaped permanent magnet 21 and a magnetic sensitive element 22 arranged in a front-to-back arrangement in the moving direction (v). In the detection process, the detection device assembly moves in the moving direction (v), the permanent magnet moves first, and the magnetic sensitive element in the rear row in the moving direction (v) detects the residual magnetic parameter value remaining in the colloid; as in an embodiment of 5, the detection device assembly 20 is a U-shaped permanent magnet 21 and a pickup detection coil 23 arranged on one or both of the two U-shaped legs of the U-shaped permanent magnet 21. It can be attached to the U-shaped leg surface of the U-shaped permanent magnet 21, or wound on the U-shaped leg. The preferred embodiment is to be arranged on the rear U-shaped leg of the two U-shaped legs in the moving direction v, and the evaluation and judgment of the quality of lithium battery glue filling can be realized by simply winding the coil.

[0044] like Figure 6 and Figure 7 As shown, the detection device combination 20 includes an array of multiple permanent magnets 21 and magnetic sensitive elements 22, which are adapted to the width of the detection surface to form an array detection sensor device. It can be adapted to the detection of one surface of the lithium battery, or adapted to the detection of two surfaces, or four surfaces or six surfaces at the same time. According to different needs, an array detection sensor combination device is set, and a large area is scanned at the same time, and comprehensive data analysis and calculation are performed. By scanning the area, the coverage rate of the lithium battery aluminum plate encapsulation glue is calculated to determine the qualified rate.

[0045] The above is one embodiment of the present invention. In addition, it should be noted that any equivalent or simple changes made based on the structure, features and principles described in this patent concept are included in the protection scope of this patent.

Claims

1. A lithium battery glue filling quality detection method, characterized in that A technical method is used to determine whether there are bad gaps in the colloid by using a permanent magnet to magnetize the encapsulated colloid and a magnetic sensitive element to detect the residual magnetic field strength. The specific method steps are as follows: a. Detection device combination: select a permanent magnet and a magnetic sensor combination, and select an appropriate detection device combination according to the actual volume and shape of the lithium battery combination or the specific parameters and thickness of the encapsulation and glue filling. The permanent magnet is a long strip or U-shaped permanent magnet, and the magnetic sensor is set at the rear of the long strip permanent magnet in the moving direction, or at the rear U-shaped foot of the U-shaped permanent magnet in the moving direction; b. Calibration of residual magnetic parameters: According to the thickness of the aluminum plate and the glue layer in the aluminum plate packaging and glue pouring of the lithium battery, calibrate the standard value of the detection device combination; c. Actual scanning and testing: According to the parameters of the magnetic parameter standard values ​​calibrated by the detection device combination, select the actual measurement parameters, perform mobile scanning and testing on the aluminum plate surface of the lithium battery combination to be tested, and record the residual magnetic parameter data calculated and tested; d. Calculation, analysis and judgment: Compare and analyze the residual magnetic parameter data actually detected in step c with the residual magnetic parameter standard value calculated and set in step b to determine the degree of packaging glue filling.

2. A lithium battery glue filling quality detection method according to claim 1, characterized in that The residual magnetic parameter calibration in step b is to calibrate and calculate the standard value of the residual magnetic parameter of a single surface, that is, the single surface of the lithium battery combination that can be continuously scanned is used as the standard value. Similarly, in the actual scanning and detection in step c, the parameter value of a single detection surface is calculated during the detection.

3. A lithium battery glue filling quality detection method according to claim 2, characterized in that The calculation of the residual magnetic parameter value of a single detection surface also includes merging the detection values ​​detected by multiple detection device arrays.

4. A lithium battery glue filling quality detection method according to claim 3, characterized in that It also includes the residual magnetic parameter value of a single test surface calculated when combining multiple tests, which is used as the qualified rate judgment of the entire lithium battery combination packaging and glue filling.

5. A lithium battery glue filling quality detection method according to claim 1, characterized in that The detection device combination is a bar permanent magnet and a magnetic sensitive element arranged in a front-to-back arrangement in the moving direction (v). During the detection process, the detection device combination moves in the moving direction (v), with the permanent magnet moving first and the magnetic sensitive elements in the rear row in the moving direction (v) detecting the residual magnetic parameter value remaining in the colloid.

6. A lithium battery glue filling quality detection method according to claim 1, characterized in that The detection device combination is a combination of a U-shaped permanent magnet and a magnetic sensitive element. The two U-shaped legs of the U-shaped permanent magnet are arranged to move forward and backward in the moving direction (v), and the magnetic sensitive element is arranged on a straight line between the two U-shaped legs of the U-shaped permanent magnet. During the detection process, the detection device combination moves in the moving direction (v), and the magnetic sensitive element detects the residual magnetic parameter value remaining in the colloid in the moving direction (v).

7. A lithium battery glue filling quality detection method according to claim 1, characterized in that The detection device is composed of a U-shaped permanent magnet and a pickup detection coil arranged on one or both of the two U-shaped legs of the U-shaped permanent magnet.

8. A device for detecting the quality of lithium battery glue filling, using the detection method as described in any one of claims 1 to 7, comprising a permanent magnet (21) and a magnetic sensitive element (22), characterized in that The permanent magnet (21) and the magnetic sensitive element (22) are arranged in sequence in the detection scanning movement direction (v), and the magnetic sensitive element (22) detects the residual magnetic parameter value of the preceding permanent magnet (21).

9. A lithium battery filling quality detection device according to claim 8, characterized in that The detection device comprises an array of multiple permanent magnets (21) and magnetic sensitive element (22) groups, which are adapted to the width of the detection surface to form an array type detection sensor device.

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