Device and method for detecting strength of hot melt adhesive for power battery

Abstract

The invention discloses a hot melt adhesive strength detection device for a power battery, which comprises a base, a lower coating disc is arranged on the base, an upper coating disc capable of moving vertically is vertically arranged above the lower coating disc, the upper coating disc is provided with a displacement sensor, the lower coating disc is provided with a force sensor, and the force sensor is connected with the displacement sensor. A curing unit is arranged at the position corresponding to the lower coating disc, a conversion unit is arranged in the base, and the conversion unit is used for recording multiple sets of curing colloid peel strength and liquid colloid coating parameters and analyzing the relation between the curing colloid peel strength and the liquid colloid coating parameters. According to the invention, the relationship between the peel strength of the hot melt adhesive and the coating parameters of the liquid colloid is obtained by detecting the peel strength of the hot melt adhesive, so that the coating parameters of the required liquid colloid can be accurately determined when the hot melt adhesive is subsequently arranged at different positions on the power battery, and the strength and reliability of the hot melt adhesive after being arranged are ensured; and the working efficiency of the hot melt adhesive during setting is also improved.

Description

Technical Field

[0001] The present invention relates to the field of hot melt adhesive strength detection, and in particular to a hot melt adhesive strength detection device and method for power batteries. Background Art

[0002] Hot melt adhesive is an adhesive that becomes liquid when heated and solidifies rapidly after cooling. Its main component is usually thermoplastic resin, supplemented with toughening agents, antioxidants and other additives. When hot melt adhesive is applied to power batteries, it can improve packaging and fixation, insulation protection, thermal management and lightweight effects. Hot melt adhesive plays an important role in the production and maintenance of power batteries due to its excellent physical properties and application flexibility, especially in the structural stability, insulation protection and thermal management of batteries, which promotes the performance improvement of power batteries.

[0003] The hot melt adhesive strength detection device in the prior art can usually only detect the peel strength value of the hot melt adhesive, and cannot obtain the relationship between the hot melt adhesive peel strength and the hot melt adhesive viscosity, coating thickness, and coating area. Therefore, it is impossible to flexibly adjust the viscosity, coating thickness, and coating area of ​​the hot melt adhesive according to the peel strength requirements of the hot melt adhesive set at different positions of the power battery, and cannot indicate the hot melt adhesive set on the power battery.

[0004] Therefore, a hot melt adhesive strength detection device and method for power batteries are proposed to solve the above-mentioned problem that the viscosity, coating thickness and coating area of ​​the hot melt adhesive cannot be flexibly adjusted according to the peel strength requirements required for the hot melt adhesive to be set at different positions of the power battery. Summary of the invention

[0005] The purpose of the present invention is to provide a hot melt adhesive strength detection device and method for power batteries, which solves the problem that the viscosity, coating thickness and coating area of ​​the hot melt adhesive cannot be flexibly adjusted according to the peel strength requirements required for the hot melt adhesive to be set at different positions of the power battery.

[0006] To achieve this object, the present invention adopts the following technical solutions: A hot melt adhesive strength detection device for a power battery comprises a base, a lower coating disc is arranged on the base, an upper coating disc which can move vertically is arranged above the lower coating disc, a displacement sensor is arranged on the upper coating disc, a force sensor is arranged on the lower coating disc, a curing unit is arranged corresponding to the lower coating disc, a conversion unit is arranged in the base, and the conversion unit is used to record multiple groups of cured colloid peeling strength and liquid colloid coating parameters, and analyze the relationship between the cured colloid peeling strength and the liquid colloid coating parameters.

[0007] A mounting frame is provided on the base, the upper coating disc and the lower coating disc are both located in the mounting frame, and the upper coating disc moves vertically in the mounting frame, a moving frame is provided on the upper coating disc, a lifting unit is provided on the moving frame, the lifting unit is provided on the mounting frame, the lifting unit is connected to a driving unit, and the driving unit is provided in the base.

[0008] The lower coating disc is provided with a plurality of annular scales, and the radii of the plurality of annular scales increase in sequence from the inside to the outside.

[0009] A plurality of linear scales are arranged at equal intervals on the lower coating disc, and the plurality of linear scales are distributed on the lower coating disc in longitude and latitude, and adjacent longitude linear scales and adjacent latitude linear scales are enclosed on the lower coating disc to form a coating area.

[0010] A method for testing the strength of hot melt adhesive for a power battery is applied to the hot melt adhesive strength testing device for a power battery as described above, and the testing method comprises the following steps: Step S1, heating the hot melt adhesive into a liquid colloid and coating it on the lower coating plate; Step S2, covering the upper coating disc on the liquid colloid of the lower coating disc, and allowing the liquid colloid to solidify to form a solidified colloid; Step S3, moving the upper coating disc upward to peel the solidified colloid from the lower coating disc or the upper coating disc, and testing the peeling strength; Step S4, repeating the above steps S1 to S3 for multiple times to obtain multiple groups of liquid colloid coating parameters and solidified colloid peeling strengths, and fitting the relationship formula between the solidified colloid peeling strength and the liquid colloid coating parameters according to the multiple groups of corresponding parameters; Step S5, after determining the peel strength and some liquid colloid coating parameters according to different positions of the hot melt adhesive set on the power battery, another part of the liquid colloid coating parameters are obtained through the relationship model.

[0011] When the liquid colloid is coated on the lower coating plate, the coating parameters of the liquid colloid are recorded, and the liquid colloid parameters include viscosity, coating area and coating thickness.

[0012] The step S2 specifically includes: Step S21, driving the upper coating disc to move downward and fit with the lower coating disc through the driving unit, the lifting unit and the moving frame; Step S22, after the upper coating disc is pressed onto the lower coating disc, a proper constant pressure is applied through the upper coating disc; Step S23: After starting to apply a proper constant pressure, the liquid colloid is allowed to cool and solidify naturally to form a solidified colloid.

[0013] The step S3 specifically includes: Step S31, driving the upper coating plate to move upward through the driving unit, the lifting unit and the moving frame to stretch the solidified colloid; Step S32, moving the upper coating disc upward at a uniform speed until the solidified colloid is separated from the upper coating disc or the lower coating disc; Step S33: When the solidified colloid is separated from the upper coating disc or the lower coating disc, corresponding data is recorded by the displacement sensor and the force sensor to obtain the peeling strength of the solidified colloid.

[0014] The relationship formula is: ; ; Where: is the theoretical peel strength; is the theoretical viscosity; is the theoretical coating thickness, It is multiple groups of actual coating thickness; are multiple groups of actual viscosities; is the theoretical coating area; is the rheological constant; is the proportionality constant; Multiple calibration coefficients are obtained based on multiple sets of actual peel strength, actual coating thickness, actual viscosity, and actual coating area. , taking the average of multiple calibration coefficients to obtain , where the nth calibration coefficient The calculation formula is as follows: ; Where: is the nth actual peel strength among multiple groups of actual peel strengths; is the nth actual coating thickness among multiple groups of actual coating thicknesses; It is the nth actual coating area among multiple groups of actual coating areas.

[0015] When the hot melt adhesive needs to be set at different locations on the power battery, the preset values ​​of the other two parameters can be obtained by using a relationship formula based on the preset peel strength required at the location and any one of the preset coating area, preset coating thickness and preset viscosity in the liquid parameters, thereby obtaining all the parameters of the liquid colloid when the hot melt adhesive is set.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a hot melt adhesive strength detection device and method for power batteries. By detecting the peel strength of the hot melt adhesive, the relationship between the peel strength of the hot melt adhesive and the coating parameters of the liquid colloid is obtained, so that the coating parameters of the required liquid colloid can be accurately determined when the subsequent hot melt adhesive is set at different positions on the power battery, ensuring the strength and reliability of the hot melt adhesive after setting. At the same time, this method can also improve the working efficiency of the hot melt adhesive during setting.

[0017] 2. The present invention provides a hot melt adhesive strength detection device and method for power batteries. The peel strength of the hot melt adhesive is detected by means of an upper coating plate, a lower coating plate, a curing unit and other structures, and instructions are provided for the subsequent setting of the hot melt adhesive, thereby effectively improving the work efficiency in the early stage of detection, improving the detection quality, and ensuring the accuracy of subsequent instructions.

[0018] 3. The present invention provides a hot melt adhesive strength detection device and method for power batteries. By repeatedly detecting the peel strength of the hot melt adhesive, an indication is given for the liquid colloid coating parameters during the subsequent hot melt adhesive setting, thereby ensuring the effectiveness of the indication. At the same time, the work efficiency is improved for the subsequent hot melt adhesive setting, thereby ensuring the best performance of the hot melt adhesive in different parts and reducing waste and errors caused by inappropriate parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the base in the present invention; Figure 3 It is a schematic diagram of the top view of the lower coating plate in the present invention; Figure 4 It is a schematic diagram of the top view of the lower coating plate in another embodiment of the present invention; Figure 5It is a schematic diagram of the split structure of the lower coating plate and the supporting plate in the present invention; Figure 6 It is a flowchart of the detection method in the present invention.

[0022] Illustrations: 1. Base; 2. Mounting frame; 3. Moving frame; 4. Lower coating plate; 41. Annular scale; 42. Force sensor; 43. Linear scale; 44. Coating area; 45. Groove; 5. Upper coating plate; 51. Displacement sensor; 6. Drive unit; 7. Lifting unit; 8. Semiconductor refrigeration unit; 81. Cold end; 9. Support plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0025] Embodiment 1: See also Figure 1-Figure 5 In this embodiment, a hot melt adhesive strength detection device for a power battery includes a base 1, a lower coating disc 4 is arranged on the base 1, an upper coating disc 5 which can be vertically moved is vertically arranged above the lower coating disc 4, a displacement sensor 51 is arranged on the upper coating disc 5, a force sensor 42 is arranged on the lower coating disc 4, a curing unit is arranged corresponding to the lower coating disc 4, a conversion unit is arranged in the base 1, and the conversion unit is used to record multiple groups of cured colloid peeling strength and liquid colloid coating parameters, and analyze the relationship between the cured colloid peeling strength and the liquid colloid coating parameters.

[0026] Specifically, a mounting frame 2 is provided on the base 1, the upper coating plate 5 and the lower coating plate 4 are both located in the mounting frame 2, and the upper coating plate 5 moves vertically in the mounting frame 2, a moving frame 3 is provided on the upper coating plate 5, and a lifting unit 7 is provided on the moving frame 3, the lifting unit 7 is provided on the mounting frame 2, the lifting unit 7 is connected to the driving unit 6, and the driving unit 6 is provided in the base 1.

[0027] When applied, the hot melt adhesive is first melted into a liquid colloid, and then the liquid colloid is coated on the lower coating disc 4 through a coating device. After the liquid colloid coating is completed, the lower coating disc 4 is mounted on the mounting frame 2 corresponding to the upper coating disc 5, and then the driving unit 6 is operated. After the driving unit 6 is operated, the moving frame 3 is moved toward the lower coating disc 4 through the lifting unit 7. After the moving frame 3 moves, the upper coating disc 5 will also move accordingly and contact with the liquid colloid on the lower coating disc 4. After the upper coating disc 5 contacts with the liquid colloid, the upper coating disc 5 continues to move downward to the liquid colloid. Apply appropriate constant pressure to the colloid and wait for the liquid colloid to solidify; when the liquid colloid solidifies to form a solidified colloid, the driving unit 6 and the lifting unit 7 operate again, and the upper coating disc 5 is moved upward at a uniform speed through the movable frame 3. After the upper coating disc 5 moves, the solidified colloid will be stretched, and after the solidified colloid is stretched to separate from the upper coating disc 5 or the lower coating disc 4, the movement of the upper coating disc 5 is stopped. During the stretching process of the upper coating disc 5 on the solidified colloid, the displacement sensor 51 and the force sensor 42 will record the corresponding data and convert it into the corresponding peel strength.

[0028] It should be noted that the working principles of the driving unit 6 and the lifting unit 7 are well known to those skilled in the art and will not be described in this embodiment. Specifically, the driving unit 6 may be a motor, and the lifting unit 7 may be a telescopic rod cooperating with the motor, and the lifting and lowering of the mobile frame 3 is achieved through the cooperation between the motor and the telescopic rod. At the same time, the coating equipment is also well known to those skilled in the art and will not be described in this embodiment.

[0029] It should be noted that a display screen is also provided on the base 1; after the displacement sensor 51 and the force sensor 42 detect the corresponding data, the conversion unit can convert the corresponding data into the corresponding peeling strength, and the final value is displayed on the display screen for the convenience of the operator to know; the specific working principles and setting positions of the displacement sensor 51, the force sensor 42, and the conversion unit are well known to those skilled in the art and will not be described in this embodiment.

[0030] Furthermore, a plurality of annular scales 41 are provided on the lower coating disc 4, and the radii of the plurality of annular scales 41 increase sequentially from the inside to the outside.

[0031] It should be noted that the coating area can be selected according to different detection requirements through the annular scale 41, so that the lower coating plate 4 has stronger adaptability; In addition, the annular scales 41 of different radii allow different coating areas 44 to be selected according to actual needs, and the coating area can be flexibly controlled to meet the different needs of applying hot melt adhesive at different positions on the power battery, thereby improving adaptability and scalability.

[0032] In a specific embodiment, see Figure 4 In this embodiment, a plurality of linear scales 43 are arranged at equal intervals on the lower coating disk 4, and the plurality of linear scales 43 are distributed on the lower coating disk 4 in longitude and latitude, and adjacent longitude linear scales 43 and adjacent latitude linear scales 43 are enclosed on the lower coating disk 4 to form a coating area 44.

[0033] It should be noted that the surface of the lower coating plate 4 can be divided into a plurality of coating areas 44 by a plurality of longitude and latitude scales, and each coating area 44 has the same size. When performing tests with different requirements, coating the coating area 44 with liquid colloid can accurately control the coating area to improve the subsequent test effect. In addition, the accuracy of the coating area during coating is ensured by the coating area 44, the precision of the coating area is strictly controlled, and standardized and efficient coating area control is achieved.

[0034] In a specific embodiment, see Figure 5 A support plate 9 located on the mounting frame 2 is arranged below the lower coating tray 4, and a curing unit is arranged on the support plate 9. The curing unit is a semiconductor refrigeration component 8. A groove 45 is provided on the bottom surface of the lower coating tray 4 corresponding to the cold end 81 of the semiconductor refrigeration component 8. The cold end 81 of the semiconductor refrigeration component 8 abuts against the groove 45. The cold end 81 of the semiconductor refrigeration component 8 is adapted to the size of the groove 45. Specifically, the number of semiconductor refrigeration components 8 is not less than two, and they are arranged at equal intervals, and the cold ends 81 of not less than two semiconductor refrigeration components 8 are located on the same plane.

[0035] Specifically, the lower coating disc 4 is detachably connected to the support plate 9 by bolts.

[0036] During application, after coating the liquid colloid on the lower coating tray 4, the lower coating tray 4 can be connected to the support plate 9 by bolts, and the cold end 81 of the semiconductor refrigeration component 8 needs to abut against the groove 45 during connection. When the liquid colloid needs to be solidified, the semiconductor refrigeration component 8 is operated for cooling, and the cold air is released from its cold end 81 to improve the solidification efficiency of the liquid colloid. The cold end 81 of the semiconductor refrigeration component 8 abuts against the groove 45 to form an embedded contact. In this way, the contact area can be effectively increased, the thermal resistance can be reduced, and the heat conduction efficiency can be improved, thereby further improving the solidification efficiency of the liquid colloid. At the same time, when the lower coating tray 4 is connected to the support plate 9, the size of the cold end 81 of the semiconductor refrigeration component 8 and the groove 45 can be adapted to determine whether the lower coating tray 4 is placed stably, thereby improving the accuracy of subsequent detection and avoiding errors in the detected peeling strength due to the lower coating tray 4 not being placed stably and the upper coating tray 5 not being in sufficient contact with the liquid colloid.

[0037] Specifically, after the lower coating tray 4 is placed, if the lower coating tray 4 can continue to move when pressed, it means that it is not placed flat. At this time, the lower coating tray 4 cannot move when pressed. When the lower coating tray 4 cannot move when pressed, it means that the lower coating tray 4 is placed stably.

[0038] It can be known that when the melted liquid colloid solidifies to form a solidified colloid, it is usually cooled and formed at room temperature. The solidification unit can increase the rate at which the liquid colloid is formed, thereby improving the detection efficiency and work efficiency. The cold end 81 of the semiconductor refrigeration component 8 serving as the solidification unit is embedded in the groove 45 and abutted, which can further increase the rate at which the liquid colloid is formed.

[0039] It should be noted that the solidification of the liquid colloid depends on the natural cooling process, but in practical applications, the solidification rate of the colloid will be affected by the ambient temperature and humidity. By arranging a semiconductor refrigeration element 8 under the lower coating plate 4, the temperature can be adjusted to more accurately control the solidification rate of the liquid colloid. The semiconductor refrigeration element 8 can not only improve the solidification efficiency, but also make the solidification process more uniform, thereby improving the accuracy of the peel strength test; In addition, the semiconductor refrigeration component 8 has the effect of accurately adjusting the cooling and solidification rate. Cooling through the semiconductor refrigeration component 8 can avoid the situation in which the liquid colloid is cooled too quickly during cooling and solidification, causing cracks in the solidified colloid or incomplete solidification, thereby affecting the accuracy of the test.

[0040] It can be understood that the working principle of the semiconductor refrigeration element 8 is well known to the technicians in this embodiment and will not be explained in this embodiment.

[0041] Embodiment 2: See also Figure 6In this embodiment, a method for detecting the strength of a hot melt adhesive for a power battery is applied to the hot melt adhesive strength detection device for a power battery in Embodiment 1. The detection method comprises the following steps: Step S1, heating the hot melt adhesive into a liquid colloid, and coating it on the lower coating plate 4; When the liquid colloid is coated on the lower coating plate 4, the coating parameters of the liquid colloid are recorded. The liquid colloid parameters include viscosity, coating area and coating thickness.

[0042] Step S2, covering the upper coating plate 5 on the liquid colloid on the lower coating plate 4, and allowing the liquid colloid to solidify to form a solidified colloid; Step S2 specifically includes: Step S21, driving the upper coating plate 5 to move downward and fit with the lower coating plate 4 through the driving unit 6, the lifting unit 7 and the moving frame 3; Step S22, after the upper coating disc 5 is pressed onto the lower coating disc 4, a proper constant pressure is applied through the upper coating disc 5; Step S23: After starting to apply a proper constant pressure, the liquid colloid is allowed to cool and solidify naturally to form a solidified colloid.

[0043] Step S3, moving the upper coating disc 5 upward to peel the solidified colloid from the lower coating disc 4 or the upper coating disc 5, and testing the peeling strength; Step S3 specifically includes: Step S31, driving the upper coating plate 5 to move upward through the driving unit 6, the lifting unit 7 and the moving frame 3, so that the solidified colloid is stretched; Step S32, moving the upper coating disc 5 upward at a constant speed until the solidified colloid is separated from the upper coating disc 5 or the lower coating disc 4; Step S33: When the solidified colloid is separated from the upper coating disc 5 or the lower coating disc 4, the displacement sensor 51 and the force sensor 42 record corresponding data to obtain the peeling strength of the solidified colloid.

[0044] Step S4, repeating the above steps S1 to S3 to obtain multiple groups of liquid colloid coating parameters and solidified colloid peeling strengths, and fitting the relationship formula between the solidified colloid peeling strength and the liquid colloid coating parameters according to the multiple groups of corresponding parameters; It should be noted that the coating parameters of the multiple groups of liquid colloids are all different, and the corresponding peeling strengths of the cured colloids obtained are also different.

[0045] The relationship formula is: ; ; Where: is the theoretical peel strength; is the theoretical viscosity; is the theoretical coating thickness, It is multiple groups of actual coating thickness; are multiple groups of actual viscosities; is the theoretical coating area; is the rheological constant; is the proportionality constant.

[0046] It is important to know that the product of multiple sets of actual coating thickness and actual viscosity is calculated, and the average of multiple products is obtained. ; Obtain multiple calibration coefficients based on multiple sets of actual peel strength, actual coating thickness, actual viscosity, and actual coating area , taking the average of multiple calibration coefficients to obtain , where the nth calibration coefficient The calculation formula is as follows: ; Where: is the nth actual peel strength among multiple groups of actual peel strengths; is the nth actual coating thickness among multiple groups of actual coating thicknesses; It is the nth actual coating area among multiple groups of actual coating areas.

[0047] It should be noted that multiple sets of peel strength, coating area, coating thickness and viscosity are obtained through a polynomial regression model. The specific fitting method is well known to those skilled in the art and will not be described in this embodiment.

[0048] In a specific embodiment, the above steps S1 to S3 are repeated three times to obtain three groups of liquid colloid coating parameters and solidified colloid peeling strengths, and a relationship formula between solidified colloid peeling strength and liquid colloid coating parameters is obtained by fitting the three groups of corresponding parameters; The relationship formula is: ; ; Where: is the theoretical peel strength; is the theoretical viscosity; is the theoretical coating thickness, There are three groups of actual coating thickness; There are three sets of actual viscosities; is the theoretical coating area; is the rheological constant; is the proportionality constant.

[0049] Three calibration coefficients are obtained based on three groups of actual peel strength, actual coating thickness, actual viscosity and actual coating area. , taking the average of the three calibration coefficients to obtain , where the first calibration coefficient The calculation formula is as follows: ; Where: It is the first actual peel strength among the three groups of actual peel strengths; It is the first actual coating thickness among the three groups of actual coating thicknesses; It is the first actual coating area among the three groups of actual coating areas. Step S5, after determining the peel strength and some liquid colloid coating parameters according to different positions of the hot melt adhesive set on the power battery, another part of the liquid colloid coating parameters are obtained through the relationship model.

[0050] When the hot melt adhesive needs to be set at different locations on the power battery, the preset values ​​of the other two parameters can be obtained by using a relationship formula based on the preset peel strength required at the location and any one of the preset coating area, preset coating thickness and preset viscosity in the liquid parameters, thereby obtaining all the parameters of the liquid colloid when the hot melt adhesive is set.

[0051] Specifically, when the preset peel strength is 60N / m and the preset coating area is 0.0317m 2 When the coating thickness is preset to 0.25 mm, the viscosity is preset to 8 Pa·s; When the preset peel strength is 40N / m and the preset coating thickness is 0.25mm, the preset coating area is 0.0211m 2 , the preset viscosity is 8Pa·s; When the preset peel strength is 25N / m and the preset viscosity is 5Pa·s, the preset coating area is 0.2m 2 , the preset coating thickness is 0.4mm.

[0052] It should be noted that the above method can accurately select other parameters of the liquid colloid according to the peel strength required at different positions of the power battery and some parameters of the liquid colloid to optimize the performance of the hot melt adhesive, thereby improving the strength and long-term reliability of the hot melt adhesive, and at the same time, when the hot melt adhesive is applied at different positions of the power battery, customized settings can be achieved according to the needs of different positions; In addition, through the established relationship model, the most appropriate parameters of the liquid colloid can be selected according to the location where the hot melt adhesive needs to be set in a relatively short time, which effectively improves work efficiency. Especially in batch settings, precise adjustments can be made according to different setting positions, effectively reducing production costs and avoiding the waste caused by setting the same hot melt adhesive in different positions. Accurate setting of hot melt adhesive can also reduce errors.

[0053] It should be noted that the preset peel strength and some liquid colloid coating parameters can be obtained through a finite element model according to the position of the hot melt adhesive on the power battery. Specifically, a finite element model can be established based on the geometric model of the power battery and the material parameters of the hot melt adhesive.

[0054] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hot melt adhesive strength testing device for power batteries, characterized in that: The invention comprises a base (1), wherein a lower coating disc (4) is arranged on the base (1), an upper coating disc (5) which can be moved vertically is arranged above the lower coating disc (4), a displacement sensor (51) is arranged on the upper coating disc (5), a force sensor (42) is arranged on the lower coating disc (4), a curing unit is arranged at a position corresponding to the lower coating disc (4), and a conversion unit is arranged in the base (1), wherein the conversion unit is used to record multiple sets of cured colloid peeling strength and liquid colloid coating parameters, and analyze the relationship between the cured colloid peeling strength and the liquid colloid coating parameters.

2. A hot melt adhesive strength detection device for power batteries according to claim 1, characterized in that: The base (1) is provided with a mounting frame (2), the upper coating disc (5) and the lower coating disc (4) are both located in the mounting frame (2), and the upper coating disc (5) moves vertically in the mounting frame (2), the upper coating disc (5) is provided with a moving frame (3), and the moving frame (3) is provided with a lifting unit (7), the lifting unit (7) is arranged on the mounting frame (2), the lifting unit (7) is connected to the driving unit (6), and the driving unit (6) is arranged in the base (1).

3. A hot melt adhesive strength detection device for power batteries according to claim 2, characterized in that: The lower coating disc (4) is provided with a plurality of annular scales (41), and the radii of the plurality of annular scales (41) increase sequentially from the inside to the outside.

4. A hot melt adhesive strength detection device for power batteries according to claim 2, characterized in that: A plurality of linear scales (43) are arranged at equal intervals on the lower coating disc (4); the plurality of linear scales (43) are respectively distributed on the lower coating disc (4) in longitude and latitude, and adjacent longitude linear scales (43) and adjacent latitude linear scales (43) enclose a coating area (44) on the lower coating disc (4).

5. A method for testing the strength of hot melt adhesive for power batteries, characterized in that: Applicable to the hot melt adhesive strength detection device for power batteries according to any one of claims 1 to 4, the detection method comprises the following steps: Step S1, heating the hot melt adhesive into a liquid colloid, and coating it on the lower coating plate (4); Step S2, covering the upper coating disc (5) on the liquid colloid on the lower coating disc (4), and allowing the liquid colloid to solidify to form a solidified colloid; Step S3, moving the upper coating disc (5) upward to peel the solidified colloid from the lower coating disc (4) or the upper coating disc (4), and testing the peeling strength; Step S4, repeating the above steps S1 to S3 for multiple times to obtain multiple groups of liquid colloid coating parameters and solidified colloid peeling strengths, and fitting the relationship formula between the solidified colloid peeling strength and the liquid colloid coating parameters according to the multiple groups of corresponding parameters; Step S5, after determining the peel strength and some liquid colloid coating parameters according to different positions of the hot melt adhesive set on the power battery, another part of the liquid colloid coating parameters are obtained through the relationship model.

6. A method for testing the strength of hot melt adhesive for power batteries according to claim 5, characterized in that: When the liquid colloid is coated on the lower coating plate (4), the coating parameters of the liquid colloid are recorded, wherein the liquid colloid parameters include viscosity, coating area and coating thickness.

7. A method for testing the strength of hot melt adhesive for power batteries according to claim 5, characterized in that: The step S2 specifically includes: Step S21, driving the upper coating plate (5) to move downwards and fit with the lower coating plate (4) through the driving unit (6), the lifting unit (7) and the movable frame (3); Step S22, after the upper coating disc (5) is pressed onto the lower coating disc (4), an appropriate constant pressure is applied through the upper coating disc (5); Step S23: After starting to apply a proper constant pressure, the liquid colloid is allowed to cool and solidify naturally to form a solidified colloid.

8. A method for testing the strength of hot melt adhesive for power batteries according to claim 5, characterized in that: The step S3 specifically includes: Step S31, driving the upper coating plate (5) to move upwards through the driving unit (6), the lifting unit (7) and the moving frame (3), so that the solidified colloid is stretched; Step S32, moving the upper coating disc (5) upward at a constant speed until the solidified colloid is separated from the upper coating disc (5) or the lower coating disc (4); Step S33: When the solidified colloid is separated from the upper coating disc (5) or the lower coating disc (4), corresponding data is recorded by the displacement sensor (51) and the force sensor (42) to obtain the peeling strength of the solidified colloid.

9. A method for testing the strength of hot melt adhesive for power batteries according to claim 5, characterized in that: The relationship formula is: ； ； Where: is the theoretical peel strength; is the theoretical viscosity; is the theoretical coating thickness, It is multiple groups of actual coating thickness; are multiple groups of actual viscosities; is the theoretical coating area; is the rheological constant; is the proportionality constant; Multiple calibration coefficients are obtained based on multiple sets of actual peel strength, actual coating thickness, actual viscosity, and actual coating area. , taking the average of multiple calibration coefficients to obtain , where the nth calibration coefficient The calculation formula is as follows: ； Where: is the nth actual peel strength among multiple groups of actual peel strengths; is the nth actual coating thickness among multiple groups of actual coating thicknesses; It is the nth actual coating area among multiple groups of actual coating areas.

10. A method for testing the strength of hot melt adhesive for power batteries according to claim 9, characterized in that: When the hot melt adhesive needs to be set at different locations on the power battery, the preset values ​​of the other two parameters can be obtained by using a relationship formula based on the preset peel strength required at the location and any one of the preset coating area, preset coating thickness and preset viscosity in the liquid parameters, thereby obtaining all the parameters of the liquid colloid when the hot melt adhesive is set.

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