Detection tool for packaging strength of battery capacitor cell

Abstract

The utility model relates to a detection tool for the packaging strength of a battery capacitor cell. The detection tool comprises a bursting test tool, a protective cover, a pressure regulating valve, a pressure gauge and an air pipe, the bursting test tool comprises a lower pressing plate, an upper pressing plate, an air pipe connector and sealant. The lower pressing plate is detachably connected with the upper pressing plate, and the limited clamping area is used for placing the soft package super capacitor monomer; an air outlet hole is formed in the upper pressing plate and is connected with an external air pipe through an air pipe joint; the air pipe is connected with an external compressed air source through a pressure regulating valve pressure gauge; holes are drilled in the soft package super capacitor monomers and correspond to the air outlet holes of the upper pressing plate, and sealant is coated around the holes. According to the utility model, the problems that the heat sealing strength cannot be rapidly detected and the poor packaging position cannot be comprehensively judged in the conventional soft package super capacitor monomer shell detection method are solved.

Description

Technical Field

[0001] This invention relates to the technical field of lithium-ion capacitor electrode testing devices, and particularly to a testing fixture for the packaging strength of battery capacitor cells. Background Technology

[0002] In the manufacturing process of battery / capacitor cells with flexible packaging shells, the cell is wrapped in a perforated aluminum-plastic film shell, and then the shell is heat-sealed around its perimeter. The first sealing process involves sealing the aluminum-plastic film shell on three sides, near the tabs and at the top. The second sealing process seals the air pocket side of the cell shell. The sealing quality of the cell shell directly determines the cell's ability to withstand internal gas pressure and whether electrolyte leakage occurs. Therefore, the sealing strength of the cell shell is a crucial testing point in the manufacturing process of flexible battery / capacitor cells and has become a hot topic of research.

[0003] Currently, the common method for inspecting the heat-sealing quality of aluminum-plastic film soft-pack casings is to measure the encapsulation thickness and tensile strength of the aluminum-plastic film casing. However, this method cannot quickly detect the entire aluminum-plastic film encapsulation position of the battery cell and find the defective encapsulation position. It is not conducive to the root cause analysis of the failed battery cell and is prone to missing the detection position, which may lead to the risk of leakage of soft-pack battery / capacitor cells in the later stage. Utility Model Content

[0004] To address the shortcomings of existing technologies and solve the problems of current methods for inspecting the casing of soft-pack supercapacitor cells, which cannot quickly detect their heat-sealing strength and cannot comprehensively identify the location of defective packages, this invention provides a testing fixture for the packaging strength of battery capacitor cells.

[0005] In one possible implementation, a testing fixture for the packaging strength of a battery capacitor cell is provided, comprising: a burst testing fixture, a protective cover, a pressure regulating valve, a pressure gauge, and a gas tube; wherein the burst testing fixture is housed within the protective cover, and the burst testing fixture includes:

[0006] A lower pressure plate and an upper pressure plate are positioned above the lower pressure plate and are detachably connected. An air vent is provided on the upper pressure plate. A clamping area is defined between the upper and lower pressure plates, and a soft-pack supercapacitor cell is placed within this clamping area. Holes are drilled in the soft-pack supercapacitor cell, corresponding to the air vents on the upper pressure plate. An air pipe connector connects to the air vents on the upper pressure plate and to an external air pipe. An air pipe, with one end connected to the air pipe connector and the other end passing through a protective cover and connected to an external compressed air source via a pressure regulating valve and pressure gauge, is also included. The testing fixture further includes: sealant applied around the drilled holes in the soft-pack supercapacitor cell; and filling material between the upper pressure plate and the contact surface between the soft-pack battery or capacitor cell.

[0007] In one possible implementation, the upper pressure plate and the lower pressure plate are connected by a fastening nut.

[0008] In one possible implementation, it further includes: a control device configured to receive the pressure reading P of the pressure gauge on the pressure regulating valve when a soft-pack supercapacitor cell explodes; and to compare the pressure reading P with a specified pressure value P1; if P ≥ P1, then the soft-pack supercapacitor cell is determined to be qualified; if P < P1, then the soft-pack supercapacitor cell is determined to be unqualified.

[0009] In one possible implementation, the pressure gauge of the pressure regulating valve is a digital display pressure gauge.

[0010] In one possible implementation, the protective cover is made of one of the following materials: plastic, plexiglass, or acrylic sheet.

[0011] In one possible implementation, the pressure regulating valve pressure gauge is adjustable to a pressure of 0 kPa to 1000 kPa.

[0012] In one possible implementation, the pressure value P1 is specified to be in the range of 300 kPa to 400 kPa.

[0013] Based on the above technical solution, the battery capacitor cell packaging strength testing fixture of this utility model places the soft-pack supercapacitor cell in the clamping area between the upper and lower pressure plates, ensuring that the hole of the soft-pack supercapacitor cell is aligned with the air outlet of the upper pressure plate, and simultaneously applying sealant around the hole to ensure airtightness; then, the upper and lower pressure plates are fixedly connected by tightening nuts; subsequently, the air pipe is connected to the air pipe connector, and led out through the protective cover to the pressure gauge of the pressure regulating valve, and then connected to an external compressed air source; after starting the compressed air source, the pressure is adjusted by the pressure gauge of the pressure regulating valve, and the pressure gauge reading P at the time of cell explosion is recorded; the detected pressure value P is compared with the preset pressure value P1 to determine whether the soft-pack supercapacitor cell is qualified; the whole process realizes rapid detection and result judgment of packaging strength, and has the characteristics of convenient operation, safety and reliability. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a battery capacitor cell packaging strength testing fixture according to one embodiment of the present invention.

[0016] Figure 2 This is a schematic flowchart illustrating a method for testing the packaging strength of a battery capacitor cell using a testing fixture according to one embodiment of the present invention.

[0017] In the picture:

[0018] Explosion test fixture 100, lower pressure plate 110, upper pressure plate 120, air pipe connector 130, fastening nut 140, soft-pack supercapacitor unit 200, protective cover 300, pressure regulating valve and pressure gauge 400, air pipe 500. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] To address the limitations of existing methods for inspecting the casing of soft-pack supercapacitors, which cannot quickly assess heat seal strength and comprehensively identify defective packages, this application proposes a testing fixture for the packaging strength of battery capacitor cells.

[0024] See Figure 1 In one possible implementation, a testing fixture for the packaging strength of a battery capacitor cell is characterized by comprising: a burst test fixture 100, a protective cover 300, a pressure regulating valve and a pressure gauge 400, and an air tube 500; wherein,

[0025] The blasting test fixture 100 is placed inside the protective cover 300. The blasting test fixture 100 includes:

[0026] Lower pressure plate 110,

[0027] The upper pressure plate 120 is positioned above the lower pressure plate 110. The upper pressure plate 120 and the lower pressure plate 110 are detachably connected. An air vent is provided on the upper pressure plate 120.

[0028] A clamping area is defined between the upper pressure plate 120 and the lower pressure plate 110, and the soft-pack supercapacitor cell 200 is placed within the clamping area defined between the upper pressure plate 120 and the lower pressure plate 110; the soft-pack supercapacitor cell 200 has holes drilled in it, and these holes correspond to the vent holes opened on the upper pressure plate 120.

[0029] The air pipe connector 130 is connected to the air outlet of the upper pressure plate 120 and to the external air pipe 500; and,

[0030] The air hose 500 has one end connected to the air hose connector 130, and the other end passes through the protective cover 300 and is connected to an external compressed air source via a pressure regulating valve and pressure gauge 400; the testing fixture also includes:

[0031] Sealant is applied around the drilled holes in the soft-pack supercapacitor cell 200; and fills the space between the upper pressure plate 120 and the contact surface of the soft-pack battery or capacitor cell.

[0032] This testing fixture applies compressed air to the soft-pack supercapacitor cell 200 for pressure testing. The burst test fixture 100 provides a structure for clamping the soft-pack supercapacitor cell 200 and connects to an external air source via an air pipe connector 130 and a pressure regulating valve and pressure gauge 400. The pressure of the external compressed air is adjusted, and air enters the soft-pack supercapacitor cell 200 through the air pipe 500. The pressure gradually increases until the encapsulation strength reaches its limit, causing a burst. Sealant applied around the holes and sealant filled between the upper pressure plate 120 and the contact surface between the soft-pack battery cell 200 ensure airtightness. A protective cover 300 provides safety protection, preventing flying debris from injuring operators.

[0033] In one possible implementation, the upper pressure plate 120 and the lower pressure plate 110 are connected by a fastening nut 140.

[0034] By setting a fastening nut 140 between the upper pressure plate 120 and the lower pressure plate 110, the two pressure plates can be firmly connected together to form a stable clamping structure. During use, operators can quickly assemble and disassemble the upper pressure plate 120 and the lower pressure plate 110 by tightening or loosening the fastening nut 140. This connection method ensures the structural strength of the equipment while facilitating the clamping and removal of the soft-pack supercapacitor cells 200, thereby improving testing efficiency.

[0035] In one possible implementation, it further includes: a control device 600 configured to receive the pressure reading P of the pressure gauge 400 of the pressure regulating valve when the soft-pack supercapacitor cell 200 explodes; and compare the pressure reading P with a specified pressure value P1; if P≥P1, then the soft-pack supercapacitor cell 200 is determined to be qualified; if P<P1, then the soft-pack supercapacitor cell 200 is determined to be unqualified.

[0036] In one possible implementation, the control device 600 is communicatively connected to the pressure gauge 400 of the pressure regulating valve for receiving and processing real-time pressure data. When a single soft-pack supercapacitor cell 200 bursts during the test, the pressure gauge 400 records the pressure reading P and transmits it to the control device 600. The control device 600 analyzes the pressure value P, compares it with a preset specified pressure value P1, and outputs a judgment signal indicating the test result: if P exceeds P1, the sample packaging strength is qualified; otherwise, it is deemed unqualified.

[0037] In one possible implementation, the pressure regulating valve pressure gauge 400 is a digital pressure gauge.

[0038] The pressure values ​​during the testing process are displayed in real time on a digital screen. During the test, the digital pressure gauge can record and clearly display the pressure change from the initial pressure to the pressure at burst, providing precise pressure value input to the control device 600 and ensuring the accuracy of the test results.

[0039] In one possible implementation, the protective cover 300 is made of one of the following materials: plastic, plexiglass, or acrylic sheet.

[0040] The protective cover 300 covers the blast test fixture 100, providing necessary safety protection for operators during the testing process. Using acrylic sheet as the protective cover material allows for easy observation of the test process due to its transparency, while its high strength and impact resistance effectively block flying debris, preventing injury to operators and the surrounding environment.

[0041] In one possible implementation, the pressure regulating valve pressure gauge 400 has an adjustable pressure range of 0 kPa to 1000 kPa.

[0042] The pressure regulating valve and pressure gauge 400 achieve precise control of the input air pressure through its internal adjustment mechanism, covering a range of 0 kPa to 1000 kPa, which can meet various testing requirements from low pressure to high pressure. Operators can adjust the pressure to a suitable range according to the specific specifications of the soft-pack supercapacitor cell 200, thereby ensuring the effectiveness and accuracy of the test.

[0043] In one possible implementation, the pressure value P1 is specified to be in the range of 300 kPa to 400 kPa.

[0044] The specified pressure value P1 ranges from 300 kPa to 400 kPa and is used to determine whether the encapsulation strength of the soft-pack supercapacitor cell 200 meets the quality requirements. During the testing process, when the burst pressure P recorded by the pressure gauge 400 of the pressure regulating valve is greater than the upper limit of the specified range of 400 kPa, the sample encapsulation strength is considered to meet the requirements; if it is less than 300 kPa, it is considered a non-conforming product. This range can be flexibly adjusted through the setting program of the control device 600 to meet the testing requirements of different product models.

[0045] A detailed description of the battery capacitor cell packaging strength testing fixture according to an embodiment of this utility model is as follows:

[0046] In order to quickly and completely detect whether the packaging strength of soft-pack battery / capacitor cells is up to standard and to find the location of unqualified packaging, this patent proposes a rapid and accurate method and testing fixture for judging the poor packaging strength of soft-pack battery / capacitor cells.

[0047] Using the aforementioned testing fixture for battery / capacitor cell packaging strength, a rapid method for determining poor packaging strength in soft-pack batteries / capacitor cells is implemented. (See [link to documentation]). Figure 2 This includes the following steps:

[0048] 101. Take a packaged but unfilled soft-pack battery / capacitor cell, drill a hole on the upper surface of the cell casing, apply a ring of sealant around the hole, align the hole on the cell surface with the vent of the pressure plate on the explosion device, and then apply a certain amount of pressure to bond and seal the upper surface of the cell to the pressure plate using the sealant.

[0049] 102. Place the blasting device with the battery core inside the protective cover, connect the air pipe connector of the pressure plate on the blasting device to the air pipe, connect the other end of the air pipe to the outlet port of the pressure regulating valve and the inlet port of the pressure gauge to the compressed air source.

[0050] 103. Open the compressed air outlet and gradually increase the pressure. Record the pressure gauge reading P when the aluminum-plastic film of the battery cell bursts. If the gas pressure reading is greater than the specified pressure value P1, the battery cell packaging strength is deemed to be qualified; if the gas pressure reading is less than the specified pressure value P1, the battery cell packaging strength is deemed to be unqualified.

[0051] As a preferred option, the cell explosion device is tested inside a protective cover to reduce noise during cell explosion and prevent carbon powder or separator debris from flying everywhere.

[0052] Preferably, the specified pressure value is the maximum air pressure required for the cell casing to explode, which is generally between 300 kPa and 400 kPa.

[0053] Preferably, the pressure regulating valve can adjust the pressure from 0 kPa to 1000 kPa. In actual experiments, the pressure value can be selected according to different product models and customer requirements. The higher the burst critical pressure, the higher the encapsulation strength of the battery cell casing.

[0054] As a preferred method, the test in step (3) follows the following procedure: when the pressure is between 0 and 200 kPa, increase the pressure by 50 kPa each time and hold for 20 seconds; when the pressure is between 200 and 300 kPa, increase the pressure by 10 kPa each time and hold for 40 seconds; when the pressure is greater than 300 kPa, increase the pressure by 5 kPa each time and hold for 60 seconds. Under the same pressure, a certain holding time is required to determine the quality of the cell packaging strength.

[0055] The battery capacitor cell packaging strength testing fixture of this utility model has the following beneficial effects:

[0056] (1) Apply air pressure to the inside of the packaged cell. When a certain air pressure is reached, leakage occurs in the weak area of ​​the heat seal of the outer shell. This allows for a quick assessment of the strength of the soft-pack battery / capacitor cell shell and the determination of the weak location of the seal. This facilitates the optimization and adjustment of the heat sealing equipment and parameters by technicians, thereby improving the stability of product quality.

[0057] (2) Applicable to soft-pack battery / capacitor cells with various requirements.

[0058] (3) The test equipment is simple and the operation process is convenient.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A testing fixture for the packaging strength of a battery capacitor cell, characterized in that, include: The blasting test fixture (100), protective cover (300), pressure regulating valve and pressure gauge (400), and air pipe (500) are included; among them, The blasting test fixture (100) is placed inside the protective cover (300), and the blasting test fixture (100) includes: Lower pressure plate (110). The upper pressure plate (120) is placed above the lower pressure plate (110). The upper pressure plate (120) and the lower pressure plate (110) are detachably connected. An air outlet is provided on the upper pressure plate (120). A clamping area is defined between the upper pressure plate (120) and the lower pressure plate (110), and the soft-pack supercapacitor cell (200) is placed in the clamping area defined between the upper pressure plate (120) and the lower pressure plate (110); the soft-pack supercapacitor cell (200) has a hole drilled on it, which corresponds to the air outlet hole opened on the upper pressure plate (120); An air pipe connector (130) is connected to the air outlet of the upper pressure plate (120) and to an external air pipe (500); and, The air pipe (500) is connected at one end to the air pipe connector (130) and at the other end through the protective cover (300) and connected to an external compressed air source via the pressure regulating valve and pressure gauge (400). Sealant is applied around the drilled holes in the soft-pack supercapacitor cell (200); and sealant is applied between the upper pressure plate (120) and the contact surface of the soft-pack battery or capacitor cell.

2. The testing fixture for the packaging strength of battery capacitor cells according to claim 1, characterized in that, The upper pressure plate (120) and the lower pressure plate (110) are connected by a fastening nut (140).

3. The testing fixture for the packaging strength of battery capacitor cells according to claim 2, characterized in that, Also includes: The control device (600) is configured to receive the pressure reading P of the pressure gauge (400) of the pressure regulating valve when the soft-pack supercapacitor cell (200) explodes; and compare the pressure reading P with the specified pressure value P1; if P≥P1, the soft-pack supercapacitor cell (200) is determined to be qualified; if P<P1, the soft-pack supercapacitor cell (200) is determined to be unqualified.

4. The testing fixture for the packaging strength of battery capacitor cells according to claim 3, characterized in that, The pressure gauge (400) of the pressure regulating valve is a digital display pressure gauge.

5. The testing fixture for the packaging strength of battery capacitor cells according to claim 4, characterized in that, The protective cover (300) is made of one of the following materials: plastic, plexiglass or acrylic sheet.

6. The testing fixture for the packaging strength of battery capacitor cells according to claim 5, characterized in that, The pressure regulating valve pressure gauge (400) can adjust the pressure from 0 kPa to 1000 kPa.

7. The testing fixture for the packaging strength of battery capacitor cells according to claim 6, characterized in that, The specified pressure value P1 ranges from 300 kPa to 400 kPa.

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