Sampling device for lithium polymer battery package pull test

Abstract

This utility model belongs to the field of lithium-ion polymer battery production technology, and relates to a sampling device for tensile testing of lithium polymer battery packaging. It includes a pressure rod, a blade holder, a lower blade, an upper blade, a spring-assisted automatic return mechanism, a pressure rod support, a pressure rod rotating shaft, a force transmission shaft, and an upper blade holder. The lower blade is fixedly mounted on the blade holder, and the upper blade is fixedly mounted on the upper blade holder. The pressure rod support is relatively fixed to the blade holder. The pressure rod is rotatably connected to the pressure rod support via the pressure rod rotating shaft, forming a force-saving lever structure. The pressure rod is connected to the upper blade holder via the force transmission shaft. The spring-assisted automatic return mechanism is connected between the upper blade holder and the blade holder. The upper and lower blades of this device complete the cutting through a force-saving lever design, and automatically return to their original positions after cutting, automatically dropping the material. Simultaneously, the guide groove at the front end of the blade holder ensures precise positioning of the upper and lower blades, resulting in high consistency in sample size. The sampling process does not affect sample quality, and it ensures safety by preventing accidental injury during the cutting and sampling process.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion polymer battery production technology, and in particular relates to a sampling device for testing the packaging tensile strength of lithium polymer batteries. Background Technology

[0002] Assembly is a crucial step in lithium-ion battery production, and the key to assembly quality lies in casing and encapsulation, the stability of which directly impacts battery safety.

[0003] Lithium-ion polymer batteries are coated with a thin film—an aluminum-plastic film—which is a composite film. The encapsulated aluminum-plastic film must possess excellent sealing performance, blocking moisture and gas, and sufficient adhesive strength to resist the pulling force between the two layers of aluminum-plastic film caused by internal gas pressure. The method used in the production process to measure the adhesive strength of the aluminum-plastic film is to measure the encapsulation tensile force during battery production. Currently, the conventional method is to dissect the encapsulated battery, remove the internal electrode assembly, and then take a sample of a fixed width of encapsulated aluminum-plastic film, including a portion of unencapsulated aluminum-plastic film. The unencapsulated portion of the sample is then fixed onto a tensile testing machine to test the encapsulation tensile force of the encapsulated area. However, during the testing process, it is necessary to ensure the consistency of the sample width. Currently, the commonly used method is scissor cutting, which cannot effectively guarantee the consistency and accuracy of the cut width, leading to inaccurate measurement results.

[0004] Therefore, to solve the above problems, it is necessary to design a dedicated sampling device for packaged aluminum-plastic film samples to ensure convenient operation, time and labor saving, safety and reliability, and to guarantee the consistency and accuracy of sample collection. Utility Model Content

[0005] The purpose of this invention is to provide a sampling device for tensile testing of lithium polymer battery packaging. When performing tensile testing on lithium-ion polymer batteries, samples that meet the size requirements are taken for testing according to the process documents, which can ensure the consistency and accuracy of sampling.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a sampling device for tensile testing of lithium polymer battery packaging, comprising a pressure rod, a tool holder, a lower tool, an upper tool, a spring automatic return mechanism, a pressure rod support, a pressure rod rotating shaft, a force transmission shaft, and an upper tool holder. The lower tool is fixedly mounted on the tool holder; the upper tool is fixedly mounted on the upper tool holder; the pressure rod support is relatively fixed to the tool holder; the pressure rod is rotatably connected to the pressure rod support via the pressure rod rotating shaft, forming a force-saving lever structure; the pressure rod is connected to the upper tool holder via the force transmission shaft, and the hole on the pressure rod that mates with the force transmission shaft is an elongated hole, so as to convert the rotation of the pressure rod around the pressure rod rotating shaft into linear motion of the upper tool holder and the upper tool in the vertical direction; the spring automatic return mechanism is connected between the upper tool holder and the tool holder, and is used to drive the upper tool holder and the upper tool to automatically reset after the pressure rod is pressed down. This device forms a force-saving lever structure through the cooperation of a pressure rod and a pressure rod support, while the automatic spring rebound mechanism enables the sampling device to automatically rebound and lift after being pressed down.

[0007] Preferably, the upper tool holder has through holes at each of its four corners, with steps inside each hole. The automatic spring return mechanism is installed within these through holes and includes a bolt and a spring fitted onto the bolt. The upper end of the spring is engaged with the step, and the upper part of the bolt is secured to the through hole of the upper tool holder by a nut. The lower part of the bolt is fixedly connected to the tool holder to prevent separation of the upper tool holder from the tool holder. In this device, the upper tool holder is connected to the tool holder via a spring and a bolt. When the pressure rod mechanism completes its downward pressing action, the automatic spring return mechanism automatically lifts, causing the upper tool holder and the upper tool to be simultaneously springed back to their original positions. At this time, the nut of the bolt is engaged with the upper tool holder, and the lower part of the bolt is connected to the tool holder, preventing separation.

[0008] Preferably, the tool holder is provided with a guide groove, and the upper tool slides in the guide groove, thereby ensuring accurate matching between the upper and lower tools.

[0009] Preferably, the pressure rod shaft and the circular hole on the pressure rod are in clearance fit; one side of the pressure rod shaft is machined with an external thread, and the pressure rod bracket is correspondingly machined with a threaded hole; the pressure rod shaft and the pressure rod bracket are locked together by a threaded connection. In this device, the clearance fit between the pressure rod shaft and the circular hole on the pressure rod allows for relative movement between the pressure rod and the pressure rod bracket, while the pressure rod bracket and the pressure rod shaft are locked together by a thread.

[0010] Preferably, the upper blade has a beveled edge, and the upper blade and the lower blade work together to form a scissor-like structure.

[0011] Preferably, a material discharge port is provided below the blade of the lower cutter. The outer dimensions of the material discharge port are larger than those of the blade of the lower cutter, so that the material can fall automatically after sampling, ensuring that the sample is clean and flat.

[0012] Preferably, the blade holder is provided with a sampling port, the opening size of which is <5mm. This sampling port ensures consistent sampling size while limiting the opening size to prevent fingers from entering the cutting area, thus ensuring operator safety.

[0013] Preferably, the edges of the pressure rod are all rounded to ensure the safety and comfort of the operator during use.

[0014] Preferably, the lower blade is fixedly installed on the tool holder by means of a pin hole, thereby ensuring that the lower blade and the tool holder are firmly installed and do not shift.

[0015] Preferably, the sampling device has external dimensions of 150mm (length) × 20mm (width) × 50mm (height). This device is compact, portable, and easy to use for sampling.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This device features a simple, compact, lightweight, safe, and reliable design, facilitating sample collection. The upper and lower blades utilize a lever-based design to perform the cutting, and after cutting, a spring automatically returns the blades to their original position for automatic material discharge. Simultaneously, a guide groove at the front of the blade holder ensures precise positioning of the upper and lower blades, resulting in highly consistent sample dimensions. The sampling process does not affect sample quality, thus guaranteeing the accuracy of tensile test results. Furthermore, the cutting and sampling process ensures safety and prevents accidental injury. Attached Figure Description

[0018] Figure 1 This is a perspective view of the entire utility model;

[0019] Figure 2 This is a schematic diagram showing the connection between the upper tool holder and the upper tool in this utility model;

[0020] Figure 3 This is a schematic diagram showing the cooperation between the upper tool holder and the automatic spring return mechanism in this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection between the upper tool holder, the automatic spring return mechanism, and the tool post in this utility model;

[0022] Figure 5 This is a schematic diagram of the tool holder structure and the connection between the pressure rod support and the tool holder in this utility model;

[0023] Figure 6 This is a schematic diagram of the lower blade structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the cooperation structure between the upper and lower blades in this utility model;

[0025] Figure 8 This is a schematic diagram of the pressure bar structure of this utility model;

[0026] Figure 9 This is a schematic diagram of the sampling port where the sampled product is placed in this utility model.

[0027] In the diagram: 1. Pressure bar; 2. Tool holder; 2-1. Guide groove; 3. Lower tool; 3-1. Material discharge port; 4. Upper tool; 5. Automatic spring return mechanism; 5-1. Bolt; 5-2. Spring; 6. Pressure bar bracket; 7. Pressure bar shaft; 8. Force transmission shaft; 9. Upper tool holder; 9-1. Through hole; 9-2. Step; 10. Sampling port. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the specific implementation of this utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through specific circumstances. Without departing from the principle of this utility model, several improvements and modifications can be made, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0031] like Figure 1As shown, a sampling device for tensile testing of lithium polymer battery packaging includes a pressure rod 1, a tool holder 2, a lower tool 3, an upper tool 4, a spring automatic return mechanism 5, a pressure rod support 6, a pressure rod rotating shaft 7, a force transmission shaft 8, and an upper tool holder 9. The lower tool 3 is fixedly installed on the tool holder 2 via a pin hole, and the upper tool 4 is fixedly installed on the upper tool holder 9. The pressure rod support 6 is fixed relative to the tool holder 2. The pressure rod 1 is rotatably connected to the pressure rod support 6 via the pressure rod rotating shaft 7, forming a force-saving lever structure. The pressure rod 1 is connected to the upper tool holder 9 via the force transmission shaft 8, and the hole on the pressure rod 1 that mates with the force transmission shaft 8 is an elongated hole, used to convert the rotation of the pressure rod around the pressure rod rotating shaft into linear motion of the upper tool holder and the upper tool in the vertical direction. The spring automatic return mechanism 5 is connected between the upper tool holder 9 and the tool holder 2, used to drive the upper tool holder 9 and the upper tool 4 to automatically reset after the pressure rod 1 is pressed down. The upper blade holder and blade post of this device are connected by a spring-assisted automatic return mechanism. The combined pressure rod is rotatably connected to the pressure rod support via a pressure rod pivot. Simultaneously, the pressure rod pivot and the pressure rod support are locked together by a threaded connection, forming a force-saving lever structure. During operation, only a certain stroke of the pressure rod is required, and the spring-assisted automatic return mechanism automatically returns to its original position, achieving a single cutting motion of the upper and lower blades. In addition, the blade post 2 of this device is also equipped with a sampling port 10. The opening size of the sampling port 10 is <5mm. The sampling port ensures consistent sampling size and, by limiting the opening size, prevents fingers from entering the cutting area, ensuring operational safety.

[0032] like Figure 2 As shown, specifically, the upper tool holder 9 has through holes 9-1 at each of its four corners, and steps 9-2 are provided inside the through holes 9-1. An upper tool 4 is fixedly installed on the upper tool holder 9.

[0033] like Figure 3 and Figure 4 As shown, specifically, the automatic spring return mechanism 5 is installed in the through hole 9-1. The automatic spring return mechanism 5 includes a bolt 5-1 and a spring 5-2 sleeved on the bolt 5-1. The upper end of the spring 5-2 is engaged with the step 9-2. The upper part of the bolt 5-1 is engaged with the through hole 9-1 of the upper tool holder 9 by a nut. The lower part of the bolt 5-1 is fixedly connected to the tool holder 2 to prevent the upper tool holder from separating from the tool holder. In this device, the upper tool holder is connected to the tool holder by a spring and a bolt. When the pressure rod mechanism completes the downward action and the automatic spring return mechanism automatically lifts up, the upper tool holder and the upper tool are simultaneously bounced up by the spring and automatically reset. At this time, the nut of the bolt is engaged with the upper tool holder and the lower part of the bolt is connected to the tool holder to prevent the two from separating.

[0034] like Figure 5As shown, specifically, the tool holder 2 is provided with a guide groove 2-1, and the upper tool slides in the guide groove 2-1 to ensure accurate matching between the upper and lower tools. In addition, the pressure rod bracket 6 is fixedly connected to the tool holder 2 to ensure the force-saving lever structure formed by the pressure rod, the pressure rod shaft and the pressure rod bracket.

[0035] like Figure 6 As shown, specifically, the lower blade 3 in this solution is also provided with a material discharge port 3-1. The outer dimensions of the material discharge port 3-1 are larger than the outer dimensions of the lower blade edge, so that the material can fall automatically after sampling, ensuring the cleanliness and flatness of the sample.

[0036] like Figure 7 As shown, specifically, the blade of the upper blade 4 has a beveled structure, and when the upper blade 4 and the lower blade 3 are combined, they form a scissor-like structure, thereby achieving the cutting function.

[0037] like Figure 8 The diagram shows the structure of the pressure rod. The hole through which the pressure rod 1 mates with the force transmission shaft 8 is an elongated hole design. While the force transmission shaft 8 rotates, it can slide linearly along the elongated hole, thus ensuring that the rotation of the pressure rod 1 around the pressure rod pivot 7 is converted into linear motion of the upper tool holder 9 and the upper tool 4 in the vertical direction. Furthermore, all edges of the pressure rod in this device are rounded to ensure the safety and comfort of the operator.

[0038] The working principle of this device is as follows: First, the pressure rod 1 is slightly lifted, which drives the upper knife holder 9 and the upper knife 4 to move upward through the force transmission shaft 8. Then, the product to be sampled is placed into the sampling port, such as... Figure 9 As shown. Next, press down on the pressure rod 1, which drives the upper blade holder 9 and upper blade 4 downwards via the force transmission shaft 8. The upper blade 4 slides within the guide groove 2-1 at the front end of the blade holder 2, precisely positioning itself within the cutting edge of the lower blade 3 to complete the shearing operation. Release the pressure rod 1; it rebounds under the elastic force of the spring 5-2 until it returns to its initial position. Bolt 5-1 connects the upper blade holder 9 and the blade holder 2, preventing them from separating. Finally, remove the sampled product from the sampling port. The sheared sample will fall from the discharge port 3-1 of the lower blade 3, completing the sampling process.

[0039] The sampling device measures 150mm in length, 20mm in width, and 50mm in height. It is compact, portable, and easy to use for sampling.

[0040] It should be noted that the sampling size of this device can be designed according to the size to be sampled, making it suitable for batch sampling of the same size.

Claims

1. A sampling device for tensile testing of lithium polymer battery packaging, characterized in that: The device includes a pressure rod, a tool holder, a lower tool, an upper tool, a spring-assisted automatic return mechanism, a pressure rod support, a pressure rod rotating shaft, a force transmission shaft, and an upper tool holder. The lower tool is fixedly mounted on the tool holder; the upper tool is fixedly mounted on the upper tool holder; the pressure rod support is fixed relative to the tool holder; the pressure rod is rotatably connected to the pressure rod support via the pressure rod rotating shaft, forming a force-saving lever structure; the pressure rod is connected to the upper tool holder via the force transmission shaft, and the hole on the pressure rod that mates with the force transmission shaft is an elongated hole, so as to convert the rotation of the pressure rod around the pressure rod rotating shaft into linear motion of the upper tool holder and the upper tool in the vertical direction; the spring-assisted automatic return mechanism is connected between the upper tool holder and the tool holder, and is used to drive the upper tool holder and the upper tool to automatically reset after the pressure rod is pressed down.

2. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The upper tool holder has through holes at each of its four corners, with steps inside each through hole. The automatic spring return mechanism is installed inside each through hole and includes a bolt and a spring fitted on the bolt. The upper end of the spring is engaged with the step, and the upper part of the bolt is engaged with the through hole of the upper tool holder by a nut. The lower part of the bolt is fixedly connected to the tool holder to prevent the upper tool holder from separating from the tool holder.

3. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The tool holder is provided with a guide groove, and the upper tool slides in conjunction with the guide groove.

4. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The pressure rod shaft and the circular hole on the pressure rod are clearance fit; one side of the pressure rod shaft is machined with an external thread, and the pressure rod bracket is correspondingly machined with a threaded hole; the pressure rod shaft and the pressure rod bracket are locked together by a threaded connection.

5. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The upper blade has a beveled edge, and when the upper blade and the lower blade work together, they form a scissor-like structure.

6. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The cutting edge of the lower blade is provided with a material discharge port, and the outer dimensions of the material discharge port are larger than the outer dimensions of the cutting edge of the lower blade.

7. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The tool holder is provided with a sampling port, and the opening size of the sampling port is <5mm.

8. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The edges of the pressure rod are all chamfered with rounded corners.

9. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The lower blade is fixedly installed on the tool holder by means of a pin hole.

10. The sampling device for tensile testing of lithium polymer battery packaging according to claim 1, characterized in that: The sampling device has external dimensions of 150mm (length) × 20mm (width) × 50mm (height).

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