Apparatus and probes for battery pin prick experiments

Abstract

The utility model discloses a kind of equipment and its probe for battery needle puncture experiment, and the probe for battery needle puncture experiment includes: needle body and needle tip, the needle body is cylindrical piece, the needle tip is conical piece, the bottom surface of the needle tip is connected with the axial end of the needle body, the outer surface of the needle tip is equipped with recess, the inside of the needle body has passage;Temperature sensing piece, the temperature sensing piece is located in the recess, and the temperature sensing piece is electrically connected with external data detection equipment through the passage in the inside of the needle body.The probe of the application can accurately measure the temperature inside battery, and the manufacturing cost is low.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and more specifically, to a device and probe for a battery needle penetration test. Background Technology

[0002] The battery nail penetration test is an important safety testing method, mainly used to assess the risk of thermal runaway in lithium-ion batteries (or other types of batteries) under extreme internal short-circuit conditions. High-energy-density batteries experience extremely high local currents during short circuits, rapidly accumulating heat and potentially triggering a chain reaction that leads to electrolyte decomposition, oxygen release from the positive electrode material, and reactions between the negative electrode and the electrolyte, resulting in thermal runaway. With the increasing sales of electric vehicles, battery cells and battery packs need to withstand real-world risks such as collisions and compression, making the nail penetration test one of the benchmark tests for power battery safety design.

[0003] Internal short circuits within batteries, leading to massive heat buildup, are a major cause of battery fires and explosions. Therefore, monitoring the internal temperature of battery cells is crucial in nail penetration abuse tests. Analyzing relevant data allows for a better understanding of the safety thresholds and corresponding solutions for battery thermal runaway induced by nail penetration. In this process, the ability to safely and effectively monitor the internal temperature of battery cells is paramount.

[0004] Currently, most methods for detecting temperature during battery needle penetration abuse rely on complex equipment such as thermal infrared spectroscopy, and cannot detect data points accurately at high frequencies, resulting in some errors in the data. In addition, existing methods and equipment for related technologies are expensive and have long experimental cycles, making it impossible to repeat experiments multiple times. Utility Model Content

[0005] One objective of this invention is to provide a probe for battery needle penetration testing, which can at least solve at least one of the technical problems of current temperature detection equipment in battery needle penetration abuse, such as complex structure, high cost and poor accuracy.

[0006] Another objective of this invention is to provide an apparatus for a battery needle penetration test, including the aforementioned probe for the battery needle penetration test.

[0007] To achieve the above objectives, the present invention provides the following technical solution.

[0008] According to a first aspect of the present invention, a probe for a battery needle penetration test includes: a needle body and a needle tip, wherein the needle body is a cylindrical component, the needle tip is a conical component, the bottom surface of the needle tip is connected to one axial end of the needle body, the outer surface of the needle tip is provided with a groove, and the interior of the needle body has a channel; a temperature sensing element is disposed in the groove, and the temperature sensing element is electrically connected to an external data detection device through the channel inside the needle body.

[0009] Optionally, the outer surface of the needle tip is provided with a spirally extending groove, one end of which extends toward the direction of the needle body, and the other end of which extends toward the tip of the needle tip.

[0010] Optionally, the cross-section of the groove is an arc or a V-shaped arc.

[0011] Optionally, the depth of the groove is 0.5mm-1mm; and / or, the width of the groove is 0.5mm-1mm.

[0012] Optionally, the temperature sensing element is a thermocouple temperature sensing wire.

[0013] Optionally, the perimeter of the bottom surface of the needle tip is L1, and the length of the groove is L2, where L2 does not exceed twice the length of L1.

[0014] Optionally, a sealing layer is filled in the gap between the inner wall of the groove and the outer peripheral surface of the temperature sensor.

[0015] Optionally, the sealing layer is a resin sealing layer.

[0016] The apparatus for a battery needle penetration test according to a second aspect of the present invention includes any of the probes described above for a battery needle penetration test.

[0017] Optionally, the device for the battery needle penetration test further includes a coating mechanism having a receiving cavity and a nozzle. The receiving cavity is used to contain a thermosetting solution, and the coating mechanism coats the thermosetting solution onto the outer surface of the battery through the nozzle to form a protective layer on the outer surface of the battery.

[0018] Therefore, the probe for battery nail penetration testing according to the embodiments of this application employs a needle body, a needle tip, and a temperature sensing element, which not only allows for accurate measurement of the internal temperature of the battery but also reduces manufacturing costs. Furthermore, the structure and technology used in the probe for battery nail penetration testing according to the embodiments of this application are both low-cost and reusable, significantly reducing testing costs and preparation time. Moreover, the probe for battery nail penetration testing according to the embodiments of this application can be used with different types of battery cells, such as pouch cells and aluminum-cased batteries, demonstrating a wide range of applications.

[0019] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a probe according to an embodiment of the present invention;

[0022] Figure 2 This is a temperature detection data diagram of the cell surface and the inside of the cell needle hole during a needle penetration test according to an embodiment of the present invention.

[0023] Attached icon number

[0024] Probe 100;

[0025] Needle body 10; needle tip 20; temperature sensing element 30. Detailed Implementation

[0026] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0027] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] In the description of this utility model, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, 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 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The probe 100 for a battery needle penetration test according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, the probe 100 for a battery needle penetration test according to an embodiment of this application includes: a needle body 10, a needle tip 20, and a temperature sensing element 30.

[0032] Specifically, the needle body 10 is a cylindrical part, the needle tip 20 is a conical part, the bottom surface of the needle tip 20 is connected to one end of the axial direction of the needle body 10, the outer surface of the needle tip 20 is provided with a groove, the inside of the needle body 10 has a channel, the temperature sensing element 30 is provided in the groove, and the temperature sensing element 30 is electrically connected to the external data detection device through the channel inside the needle body 10.

[0033] In other words, the probe 100 for battery needle penetration testing according to the embodiments of this application combines a needle body 10, a needle tip 20, and a temperature sensing element 30. The needle body 10 is a cylindrical component, for example, a cylindrical component extending vertically. The needle tip 20 is a conical component, having a bottom surface and a top surface. For example, the axis of the needle tip 20 extends vertically, the upper end of the needle tip 20 is the bottom surface and is connected to the lower end of the needle body 10, and the lower end of the needle tip 20 is the top surface. Optionally, the needle body 10 and the needle tip 20 are integrally molded components, which can be manufactured through a one-time molding process, improving strength and reducing assembly costs.

[0034] A groove is provided on the outer surface of the needle tip 20. The groove can accommodate the temperature sensing element 30, which can be electrically connected to the outside to be energized, and can detect the internal temperature of the battery cell after the needle tip 20 pierces the surface of the battery cell. Moreover, the temperature sensing element 30 can be electrically connected to the outside and can use existing temperature sensors, such as thermocouples, and can monitor the temperature in real time.

[0035] In addition, the groove is only provided on the needle tip 20 and not on the needle body 10. The presence of the needle body 10 allows for control of the insertion depth and angle of the needle tip 20 during standard testing. In other words, the needle body 10 ensures that the probe 100 meets the required specifications and guarantees sufficient insertion depth. In this embodiment, by using the needle body 10 and needle tip 20 in cooperation, the diameter design of the needle body 10 ensures that the strength and roughness of the probe 100 meet the standard testing requirements. Furthermore, by machining a groove on the outer surface of the needle tip 20, which mates with the temperature sensor 30, the preparation process is simple and reusable, reducing testing costs. Moreover, designing the temperature sensor 30 on the needle tip 20 allows it to be closer to the highest temperature point inside the battery than the needle body 10, enabling more accurate measurements.

[0036] Therefore, the probe 100 for battery nail penetration testing according to the embodiments of this application employs a needle body 10, a needle tip 20, and a temperature sensing element 30, which not only allows for accurate measurement of the internal temperature of the battery but also results in low manufacturing costs. Furthermore, the structure and technology used in the probe 100 for battery nail penetration testing according to the embodiments of this application are both low-cost and reusable, significantly reducing testing costs and preparation time. Moreover, the probe 100 for battery nail penetration testing according to the embodiments of this application can be used with different types of battery cells, such as pouch cells and aluminum-cased batteries, thus having a wide range of applications.

[0037] Optionally, the needle tip 20 may include, but is not limited to, steel needles, ceramic needles, etc., and a wide range of materials may be used.

[0038] Optionally, the needle body 10 and the needle tip 20 are coaxially arranged to facilitate processing and setup.

[0039] According to one embodiment of this application, the outer surface of the needle tip 20 is provided with a spirally extending groove. For example, the surface of the needle tip 20 is machined with a coarse spiral pattern with a width of 1 mm. One end of the groove extends toward the direction of the needle body 10, and the other end of the groove extends toward the top of the needle tip 20, which facilitates extending the length of the groove and allows for temperature detection at multiple depths.

[0040] In some specific embodiments of this application, the cross-section of the groove is an arc or a V-shaped arc, which facilitates the fixing of the temperature sensing element 30 in the groove.

[0041] According to one embodiment of this application, the depth of the groove is 0.5mm-1mm, for example, the depth of the groove is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, which facilitates the installation of the temperature sensor 30 without affecting the strength of the needle tip 20. Furthermore, the depth of the groove here refers to the distance from the bottom wall to the opening on the cross-section of the groove; and / or, the width of the groove is 0.5mm-1mm, for example, the width of the groove is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, which reduces the difficulty of installing the temperature sensor 30 and can extend the length of the groove, allowing for temperature testing at more locations via the temperature sensor 30. It is understood that at least one of the above conditions can be selected according to specific design requirements, offering high flexibility.

[0042] In some specific embodiments of this application, the temperature sensing element 30 is a thermocouple temperature sensing wire. Compared with the test result errors and data acquisition frequency limitations caused by complex equipment such as thermal infrared, in this embodiment, using a thermocouple temperature sensing wire to directly detect the temperature can better ensure the accuracy and precision of the test data. Basic data acquisition equipment can achieve a test data collection frequency of once every 0.1 seconds, effectively avoiding the omission of test data at critical abrupt change points. In addition, by processing grooves on the surface of the needle tip 20, the grooves cooperate with the thermocouple temperature sensing wire, and the battery cell is subjected to a needle penetration test with the probe 100, the thermocouple temperature sensing wire data can also be monitored in real time, such as... Figure 2 It can be seen that the probe 100 used in the embodiments of this application provides more accurate temperature detection, which is closer to the actual internal temperature of the battery.

[0043] According to one embodiment of this application, the circumference of the bottom surface of the needle tip 20 is L1, and the length of the groove is L2, where L2 does not exceed twice L1. That is, the spiral length L2 of the spirally extending groove does not exceed twice the circumference of the bottom surface of the needle tip 20, ensuring that there are not too many thermocouple temperature sensing wires arranged on the needle tip 20, which would affect the hardness of the needle tip 20, and ensuring good contact between the thermocouple temperature sensing wires and the object being measured.

[0044] According to one embodiment of this application, a sealing layer is filled in the gap between the inner wall of the groove and the outer peripheral surface of the temperature sensor 30. For example, a thermocouple wire is embedded in the aforementioned coarse spiral pattern, and then the gap is filled with a resin solvent to maintain the needle tip state. In this embodiment, the sealing layer protects the needle tip 20 and prevents the battery casing from affecting the temperature sensor 30, such as the thermocouple wire.

[0045] In some specific embodiments of this application, the sealing layer is a resin-based sealing layer, which has the advantages of being easy to operate, having low cost, and providing good protection.

[0046] In some specific embodiments of this application, the needle body 10 has a channel inside for wiring to pass through the line electrically connected to the temperature sensing element 30, which facilitates wiring.

[0047] This application also discloses an apparatus for a battery needle penetration test, including the probe 100 for the battery needle penetration test in any of the above embodiments. Since the probe 100 of the embodiments of this application has the advantages of low cost and high detection accuracy, the apparatus for the battery needle penetration test of the embodiments of this application also has the above advantages, and will not be described in detail here.

[0048] In some specific embodiments of this application, the equipment for the battery needle penetration test further includes a coating mechanism. The coating mechanism has a receiving cavity and a nozzle. The receiving cavity is used to contain a thermosetting solution. The coating mechanism applies the thermosetting solution to the outer surface of the battery through the nozzle to form a protective layer on the outer surface of the battery. For example, a resin-based solution is uniformly applied to the battery surface and allowed to air dry and cure. The resin layer thickness is approximately 1-3 mm. After preparation, it is ready for use. In this embodiment, by uniformly applying a thermosetting solution, such as a resin solution, to a large area near the needle hole or the entire battery during the needle penetration test, with a thickness of approximately 1-3 mm, damage to the cell surface and the needle tip 20 can be avoided during the needle penetration process. When a resin-based protective layer is used, it has mechanical toughness, which can effectively limit the degree of breakage of the battery casing and prevent damage to the thermocouple temperature sensing wire embedded on the surface of the needle tip 20 when a hard casing such as a steel casing breaks.

[0049] Optionally, the resin materials used in the sealing layer and / or protective layer include, but are not limited to, ABS (acrylonitrile-butadiene-styrene copolymer), PC, etc., and the diluents used include, but are not limited to, acetone, DMSO (dimethyl sulfoxide), and DMF (dimethylformamide), resulting in lower costs. In this embodiment, the use of resin materials ensures that the thermosetting properties of the sealing layer or protective layer obtained after drying are not excessive, and it also possesses a certain degree of mechanical toughness. Furthermore, different resin materials can be used to adjust various properties of the sealing layer or protective layer to meet different types of batteries and testing requirements. Additionally, the target battery cell (different types of battery cells, such as pouch cells, aluminum-cased batteries, etc.) can be adjusted to a specified state, and a protective layer of thickness can be formed on its outer surface, which can then be subjected to a needle penetration test using probe 100.

[0050] Optionally, the equipment used for the battery needle penetration test also includes: a thermosetting device with a heating element for curing the thermosetting solution into a protective layer, which can shorten the time required to form the protective layer.

[0051] In summary, the probe 100 for battery needle penetration testing according to the embodiments of this application combines a needle body 10, a needle tip 20, and a temperature sensing element 30, using low-cost materials and a simple and convenient process to achieve the detection of the internal temperature of the battery cell in the battery needle penetration test.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A probe (100) for a battery needle penetration test, characterized in that, include: The needle body (10) and the needle tip (20) are cylindrical and conical. The bottom surface of the needle tip (20) is connected to one end of the axial direction of the needle body (10). The outer surface of the needle tip (20) is provided with a groove, and the inside of the needle body (10) has a channel. Temperature sensor (30) is disposed in the groove and is electrically connected to an external data detection device through a channel inside the needle body (10).

2. The probe (100) for battery needle penetration testing according to claim 1, characterized in that, The outer surface of the needle tip (20) is provided with a spirally extending groove, one end of which extends toward the direction of the needle body (10), and the other end of which extends toward the top of the needle tip (20).

3. The probe (100) for battery needle penetration testing according to claim 2, characterized in that, The cross-section of the groove is an arc or a V-shaped arc.

4. The probe (100) for a battery needle penetration test according to claim 3, characterized in that, The depth of the groove is 0.5mm-1mm; and / or the width of the groove is 0.5mm-1mm.

5. The probe (100) for a battery needle penetration test according to any one of claims 2-4, characterized in that, The temperature sensing element (30) is a thermocouple temperature sensing wire.

6. The probe (100) for a battery needle penetration test according to claim 5, characterized in that, The perimeter of the bottom surface of the needle tip (20) is L1, and the length of the groove is L2, where L2 is no more than twice the length of L1.

7. The probe (100) for a battery needle penetration test according to claim 1, characterized in that, The gap between the inner wall of the groove and the outer peripheral surface of the temperature sensor (30) is filled with a sealing layer.

8. The probe (100) for a battery needle penetration test according to claim 7, characterized in that, The sealing layer is a resin sealing layer.

9. An apparatus for a battery needle penetration test, characterized in that, Includes the probe (100) for battery needle penetration test as described in any of claims 1-8.

10. The apparatus for a battery needle penetration test according to claim 9, characterized in that, Also includes: A coating mechanism having a receiving cavity and a nozzle, the receiving cavity being used to contain a thermosetting solution, the coating mechanism applying the thermosetting solution to the outer surface of the battery through the nozzle to form a protective layer on the outer surface of the battery.

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