Method for detecting matching property of lithium ion battery surface protection film and aluminum plastic film
By simulating the chemical formation to detect the matching of the protective film and the aluminum-plastic film, the problems of adhesive layer residue and color difference caused by the mismatch between the protective film and the aluminum-plastic film in lithium-ion battery production were solved, and efficient quality control was achieved.
Patent Information
- Application Number
- CN202511001304.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2025-10-17
AI Technical Summary
During the production of lithium-ion batteries, adhesive residue and color difference are likely to occur between the protective film and the aluminum-plastic film after heating and pressurizing, resulting in mismatch and product scrapping. Existing detection methods are time-consuming and labor-intensive and can easily damage the aluminum-plastic film.
A simulated formation test method was used to form a simulated battery by cutting silicone sheets and aluminum-plastic films. After the simulated formation treatment, the adhesive residue and color difference of the protective film were observed to evaluate the compatibility between the protective film and the aluminum-plastic film.
It can realize the early judgment of the matching between the protective film and the aluminum-plastic film, avoid the quality problems caused by mismatch, simplify the detection process, and reduce the consumption of manpower and material resources.
Smart Images
Figure CN120801181A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lithium ion battery manufacturing, and in particular to a detection method for matching of a surface protective film of a lithium ion battery and an aluminum plastic film. BACKGROUND
[0002] Soft package lithium ion battery is a kind of lithium battery with aluminum plastic composite film as the shell. Because of its light weight, low mold cost, safety and other advantages, its market share is gradually expanding. At present, soft package lithium ion battery uses aluminum plastic film as the shell material, and the aluminum plastic film is a soft film composed of a surface coating layer, a nylon layer, an aluminum foil layer and a polypropylene layer. The common thickness is generally 60 μm~150 μm. Because of the thin thickness, if not protected, it is easy to appear grinding and damage the battery, and further cause safety hazards. Therefore, a protective film is usually pasted on the outer surface of the aluminum plastic film to protect the lithium ion battery.
[0003] The protective film has a glue layer with different adhesion, which can be pasted on the surface of the battery. After the soft package lithium ion battery is formed by heating and pressing, the glue layer may be transferred to the surface of the aluminum plastic film under high temperature and high pressure conditions, resulting in color difference and residual glue phenomenon. Because aluminum plastic films and protective films from different manufacturers and different batches of the same manufacturer may have differences, and the combination matching between different aluminum plastic films and protective films further increases the uncertainty of this phenomenon. When this situation occurs, the protective film needs to be completely torn off, and a dust-free cloth dipped in a cleaning solvent is used to wipe the color difference and glue area. The wiping process is time-consuming and labor-intensive, requires a large amount of manpower and material resources, and is easy to grind the surface coating of the aluminum plastic film, causing product scrap. SUMMARY
[0004] In view of the problem that the protective film and the aluminum plastic film are not matched after heating and pressing formation in the production of the existing soft package lithium ion battery, resulting in the problem that the glue layer of the protective film is easily left on the surface of the aluminum plastic film, the present application provides a detection method for matching of a surface protective film of a lithium ion battery and an aluminum plastic film to solve the above problems. The present application adopts a detection method for matching between the protective film and the aluminum plastic film to determine whether the protective film and the aluminum plastic film will produce abnormalities in advance, avoiding the adverse effects caused by unstable incoming materials.
[0005] The technical scheme of the present application is as follows: A detection method for matching of a surface protective film of a lithium ion battery and an aluminum plastic film, comprising the following steps: S1. Cutting a silica gel piece and two aluminum plastic films according to the size of the lithium ion battery to be tested; S2. Attaching two protective films to the outer surfaces of the two aluminum plastic films respectively; S3. The aluminum-plastic film with protective film attached in step S2 is attached to the two surfaces of the silica gel sheet respectively to form a simulation battery; S4. The simulation battery is placed in a warm and pressurized formation cabinet to perform simulation formation treatment; S5. After the simulation formation is completed, the protective film is peeled off from the aluminum-plastic film, and whether there is a color difference or adhesive residue phenomenon on the surface of the protective film is observed to evaluate the matching property.
[0006] Further, the size of the aluminum-plastic film is not less than the size of the battery, and the shape of the aluminum-plastic film is consistent with the shape of the battery.
[0007] Further, the size of the aluminum-plastic film attached to the two surfaces of the silica gel sheet is the same as that of the protective film.
[0008] Further, the shape of the battery is special-shaped or square-shaped.
[0009] Further, the size of the aluminum-plastic film is 100% to 105% of the corresponding size of the battery.
[0010] Further, when the battery is a square-shaped battery, the protective film is cut into the same size as the square-shaped battery.
[0011] Further, the thickness of the silica gel sheet is 2 to 10 mm, preferably 5 mm.
[0012] Further, in step S4, when the simulation battery is placed in the warm and pressurized formation cabinet, the following parameters are set according to the battery model: online temperature 80℃, online pressure coefficient 14 kg / cm 2 ; online temperature 80℃, online pressure coefficient 13 kg / cm 2 ; middle line temperature 75℃, online pressure coefficient 14 kg / cm 2 ; middle line temperature 75℃, online pressure coefficient 13 kg / cm 2 ; and a temperature detection device is used to monitor the actual temperature in real time to ensure temperature accuracy, and the duration of simulation formation is set to 1.5 hours to complete the simulation formation treatment.
[0013] Further, the protective film is a conventional roll-shaped long strip-shaped and a certain-shaped release special-shaped protective film.
[0014] The beneficial effects of the present application are: The lithium ion battery surface protection film and aluminum plastic film matching detection method provided by the application can match the aluminum plastic film and the protection film to be used in advance, and the matching is confirmed in advance through simulation to avoid batch quality accidents. The detection method is simple, easy to operate and has strong universality. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor.
[0016] Figure 1 is a structural schematic diagram of a square aluminum plastic film in the application.
[0017] Figure 2 is a structural schematic diagram of a special-shaped aluminum plastic film in the application.
[0018] Figure 3 is a structural schematic diagram of a special-shaped protection film in the application.
[0019] Figure 4 is a structural schematic diagram of a simulated battery to be detected in the application.
[0020] In the figure, 1 is a silica gel sheet, 2 is a first aluminum plastic film, 3 is a second aluminum plastic film, 4 is a first protection film, and 5 is a second protection film. DETAILED DESCRIPTION
[0021] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.
[0022] Embodiment 1 A lithium ion battery surface protection film and aluminum plastic film matching detection method, comprising the following steps: The lithium ion battery to be detected is a square lithium ion battery, the width is 44.5mm, the height is 100.0mm, the aluminum plastic film and the protection film are products of a certain batch from different manufacturers.
[0023] S1. The size of the square lithium ion battery to be detected is cut into a silica gel sheet and two aluminum plastic films, wherein the shape of the aluminum plastic film is as shown in Figure 1 The shape and size of the silica gel sheet are the same as those of the aluminum plastic film.
[0024] S2. Two protective films are respectively attached to the outer surfaces of the two aluminum-plastic films; S3. The aluminum-plastic films with protective films attached in step S2 are respectively attached to the two surfaces of the silica gel sheet through double-sided adhesive to form a simulated battery, and the thickness of the silica gel sheet is 5 mm; S4. The simulated battery is placed on a warming and pressurizing formation cabinet, and four groups of "upper line temperature + upper line pressure", "upper line temperature + middle line pressure", "middle line temperature + upper line pressure", and "middle line temperature + middle line pressure" are set according to the corresponding model, and the actual temperature is monitored by a temperature detection device to ensure the accuracy of the temperature, the time of formation is set, and the simulation formation work is carried out; Upper line temperature 80℃, upper line pressure coefficient 14 kg / cm 2 ; Upper line temperature 80℃, middle line pressure coefficient 13 kg / cm 2 ; Middle line temperature 75℃, upper line pressure coefficient 14 kg / cm 2 ; Middle line temperature 75℃, middle line pressure coefficient 13 kg / cm 2 ; S5. After the simulation formation is completed, the protective film is peeled off from the aluminum-plastic film, and it is observed that there is no adhesive residue on the surface of the protective film, and the tested protective film and aluminum-plastic film can be matched.
[0025] Example 2 A detection method for the matching of a lithium ion battery surface protective film and an aluminum-plastic film, comprising the following steps: The lithium ion battery to be tested is a square lithium ion battery, the width is 49.3 mm, the height is 109.0 mm, the aluminum-plastic film and the protective film are products of a certain batch from different manufacturers.
[0026] S1. According to the size of the square lithium ion battery to be tested, a silica gel sheet and two aluminum-plastic films are cut, wherein the shape of the aluminum-plastic film is as shown in Figure 1 The shape and size of the silica gel sheet are the same as those of the aluminum-plastic film.
[0027] S2. Two protective films are respectively attached to the outer surfaces of the two aluminum-plastic films; S3. The aluminum-plastic films with protective films attached in step S2 are respectively attached to the two surfaces of the silica gel sheet through double-sided adhesive to form a simulated battery, and the thickness of the silica gel sheet is 5 mm; S4. Place the simulated battery on a warm and pressurized formation cabinet, set "upper line temperature + upper line pressure", "upper line temperature + middle line pressure", "middle line temperature + upper line pressure", "middle line temperature + middle line pressure" according to the corresponding model, and monitor the actual temperature with a temperature detection device to ensure accurate temperature. Set the formation time and perform simulated formation work. Upper line temperature 80℃, upper line pressure coefficient 14 kg / cm 2 ; Upper line temperature 80℃, middle line pressure coefficient 13 kg / cm 2 ; Middle line temperature 75℃, upper line pressure coefficient 14 kg / cm 2 ; Middle line temperature 75℃, middle line pressure coefficient 13 kg / cm 2 ; S5. After the simulated formation is completed, the protective film is peeled off from the aluminum plastic film, and it is observed that there is no adhesive residue on the surface of the protective film, but there is a color difference. The protective film tested cannot match the aluminum plastic film.
[0028] Example 3 A detection method for the matching of a lithium ion battery surface protective film and an aluminum plastic film, comprising the following steps: The lithium ion battery to be tested is a special-shaped lithium ion battery, with a width 1 of 37.5 mm, a width 2 of 90.5 mm, a height 1 of 66.5 mm, and a height 2 of 48.0 mm. The aluminum plastic film and the protective film are products of a certain batch from different manufacturers.
[0029] S1. According to the size of the special-shaped lithium ion battery to be tested, cut a silica gel sheet and two aluminum plastic films, wherein the shape of the aluminum plastic film is as shown in Figure 2 The shape and size of the silica gel sheet are the same as those of the aluminum plastic film.
[0030] S2. Attach two protective films to the outer surfaces of the two aluminum plastic films, respectively; S3. Attach the aluminum plastic films with protective films attached in step S2 to the two surfaces of the silica gel sheet through double-sided adhesive to form a simulated battery, and the thickness of the silica gel sheet is 5 mm; S4. Place the simulated battery on a warm and pressurized formation cabinet, set "upper line temperature + upper line pressure", "upper line temperature + middle line pressure", "middle line temperature + upper line pressure", "middle line temperature + middle line pressure" according to the corresponding model, and monitor the actual temperature with a temperature detection device to ensure accurate temperature. Set the formation time and perform simulated formation work; Upper line temperature 80℃, upper line pressure coefficient 14 kg / cm 2 ; Upper line temperature 80℃, middle line pressure coefficient 13 kg / cm 2 ; Upper line temperature 75℃, middle line pressure coefficient 14 kg / cm 2 ; Upper line temperature 75℃, middle line pressure coefficient 13 kg / cm 2 ; S5. After the simulation of the completion of the formation, the protective film is peeled off from the aluminum plastic film, and it is observed that there is no adhesive residue on the surface of the protective film, and the protective film and the aluminum plastic film can be matched.
[0031] Example 4 A detection method for the matching of a lithium ion battery surface protective film and an aluminum plastic film, comprising the following steps: The lithium ion battery to be tested is a special-shaped lithium ion battery, with a width 1 of 31.6 mm, a width 2 of 78.5 mm, a height 1 of 60.0 mm, and a height 2 of 37.7 mm. The aluminum plastic film and the protective film are products of a certain batch from different manufacturers.
[0032] S1. A silica gel piece and two aluminum plastic films are cut according to the size of the square lithium ion battery to be tested; the shape and size of the silica gel piece are the same as those of the aluminum plastic film.
[0033] S2. Two protective films as shown in Figure 3 are respectively attached to the outer surfaces of the two aluminum plastic films; S3. The aluminum plastic films with protective films attached in step S2 are respectively attached to the two surfaces of the silica gel piece through double-sided adhesive to form a simulated battery, and the thickness of the silica gel piece is 5 mm; S4. The simulated battery is placed on a warm and pressurized formation cabinet, and four groups of "upper line temperature + upper line pressure", "upper line temperature + middle line pressure", "middle line temperature + upper line pressure", and "middle line temperature + middle line pressure" are set according to the corresponding model, and the actual temperature is monitored by a temperature detection device to ensure the accuracy of the temperature, the formation time is set, and the simulation of the formation is carried out; Upper line temperature 80℃, middle line pressure coefficient 13 kg / cm 2 ; Upper line temperature 80℃, middle line pressure coefficient 13 kg / cm 2 ; Upper line temperature 75℃, middle line pressure coefficient 14 kg / cm 2 ; Upper line temperature 75℃, middle line pressure coefficient 13 kg / cm 2 ; S5. After the simulation of the completion of the formation, the protective film is peeled off from the aluminum plastic film, and it is observed that there is no adhesive residue on the surface of the protective film, and the protective film and the aluminum plastic film cannot be matched.
[0034] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Various equivalent modifications or changes in the application can be made all without departing from the spirit and scope of the application defined in the appended claims, and any modifications or changes should be considered within the scope of the application.
Claims
1. A method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film, characterized in that: The following steps are involved: S1. Cut a silicone sheet and two aluminum-plastic films according to the dimensions of the lithium-ion battery to be tested. S2. The two protective films are attached to the outer surface of the two aluminum-plastic films; S3. The aluminum-plastic film with a protective film attached in step S2 is attached to both surfaces of the silicone sheet to form a simulated battery; S4. The simulated battery is placed in a heated and pressurized formation cabinet to simulate the formation process; S5. After the simulated formation is completed, the protective film is peeled off from the aluminum-plastic film and the surface of the protective film is observed to see if there is any color difference or adhesive residue to evaluate its matching.
2. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: The size of the aluminum-plastic film is not less than the size of the battery, and the shape of the aluminum-plastic film is consistent with the shape of the battery.
3. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: The aluminum-plastic film and the protective film bonded to the two surfaces of the silicone sheet have the same size.
4. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: The battery has an irregular or square shape.
5. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 2, wherein: The size of the aluminum-plastic film is 100% to 105% of the corresponding size of the battery.
6. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: When the battery is a square battery, the protective film is cut into the same size as the square battery.
7. The method for detecting compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: The thickness of the silicone sheet is 2-10 mm.
8. The method for detecting compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 7, wherein: The thickness of the silicone sheet is 5 mm.
9. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: In step S4, when the simulated battery is placed in a heated and pressurized formation cabinet, the following parameter groups are set according to the battery model: The upper line temperature is 80℃ and the upper line pressure coefficient is 14 kg / cm 2 ; Upper line temperature 80℃, center line pressure coefficient 13 kg / cm 2 ; The center line temperature is 75℃ and the upper line pressure coefficient is 14 kg / cm 2 ; Centerline temperature 75°C, centerline pressure coefficient 13 kg / cm 2 ; A temperature detection device is used to monitor the actual temperature in real time to ensure temperature accuracy. The duration of the simulated formation is set to 1.5 hours to complete the simulated formation process.
10. The method for detecting the compatibility between a lithium-ion battery surface protective film and an aluminum-plastic film according to claim 1, wherein: The protective film is a conventional rolled long strip or a release special-shaped protective film of a certain shape.