Clamp tool for battery test

Abstract

The utility model belongs to the technical field of batteries. The utility model provides a clamp tool for battery testing, which comprises a clamp main body, an adjusting clamping assembly arranged on the clamp main body and a connecting assembly arranged on the adjusting clamping assembly, and the height of the adjusting clamping assembly is adjusted to adapt to clamping fixation and electrical connection of batteries with different sizes. According to the clamp tool for battery testing, a battery and a testing instrument can be connected without welding and other fixing modes, testing can be stably carried out, the clamp tool can be disengaged from the clamp in an intact mode after testing, the battery is protected, the clamp tool can be repeatedly used, the manufacturing and using cost is effectively reduced, the testing efficiency can be improved, and the product quality is improved. The device is especially suitable for testing square batteries of different models and sizes.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries and relates to a fixture tool for battery testing. Background Art

[0002] With the wide application of lithium-ion batteries in fields such as electronic devices and new energy vehicles, the demand for lithium batteries is also increasing rapidly. To ensure the performance of lithium batteries, battery testing and quality control become particularly important. Square batteries are a common type of rechargeable battery and have been widely used in fields such as mobile devices and power tools. To ensure the performance and safety of square batteries, various tests need to be carried out on them, and the fixtures or tooling suitable for battery testing play a key role in the battery preparation and testing processes.

[0003] Battery testing fixtures are mainly used in the processes of battery research and development, production, use, and maintenance to achieve various tests and evaluations of batteries. These tests include electrochemical performance tests, safety performance tests, environmental adaptability tests, etc. By using battery testing fixtures, on the one hand, the battery can be fixed to prevent the battery from moving or shaking during the test, ensuring the accuracy of the test results; on the other hand, the battery can be protected from external factors such as temperature changes to avoid damage to the battery. Therefore, the use of battery testing fixtures can ensure more precise control and monitoring of various performance parameters of the battery, making the test reference basis for battery research and development, production, and selection more accurate, stable, and reliable.

[0004] Classified according to the driving method, the current battery testing fixtures in the market mainly include manual fixtures, pneumatic fixtures, electric fixtures, and special fixtures, etc. Among them, manual fixtures are simple, but most of the existing fixtures in the market need to be designed according to specific sizes and models of batteries, and their flexibility and applicability are weak during the adjustment process and cannot meet the testing requirements of batteries of various sizes and models; for example, alligator clips, polymer fixtures, cylindrical battery clips, etc. in the prior art are mainly applicable to the performance detection of button batteries with a diameter of less than 25 mm. For square batteries with different sizes and heights, there is a lack of flexible and applicable testing fixtures. At the same time, most of the existing manual fixtures need to be welded to the battery by professional technicians before testing the battery. This not only easily damages the battery, but also the welded fixtures cannot be reused. If batteries of different sizes and models need to be tested, new battery fixtures need to be manufactured again, and professional technicians need to weld the battery and the fixture again. It can be seen that the operation is cumbersome, the efficiency is low, the loss cost is high, and there is also a problem that the contact area between the fixture and the battery is small and the resistance value becomes larger, which further causes factors such as temperature rise that have adverse effects on the test, easily leading to inaccurate test result data.

[0005] For pneumatic clamps and electric clamps, such as those disclosed in CN219552499U and CN211554251U, they have relatively high precision and stability and can achieve automated control. However, they both require complex structural and component designs, which are not conducive to low-cost manufacturing and use. Special fixtures such as thermistor and internal resistance test fixtures have professional and precision requirements and are not convenient for large-scale utilization at low cost.

[0006] Therefore, there is still a need to develop a new solution for battery test fixtures or tooling, which has important practical significance for ensuring the research, development, production, and application of lithium-ion batteries. Summary of the Utility Model

[0007] In view of the problems existing in the prior art, the purpose of the present utility model is to provide a fixture tooling for battery testing, including a fixture main body, an adjustable clamping assembly disposed on the fixture main body, and a connection assembly disposed on the adjustable clamping assembly. The height is adjusted by the adjustable clamping assembly to adapt to the clamping and fixing and electrical connection of batteries of different sizes. The fixture tooling for battery testing does not use fixed connection methods such as welding to connect the battery and the test instrument, and can stably conduct tests. After the test, the battery can be detached from the fixture intact, which not only protects the battery but also enables the fixture tooling to be reused repeatedly, effectively reducing the manufacturing and use costs and improving the test efficiency, especially suitable for testing square batteries of different models and sizes.

[0008] To achieve this purpose, the present utility model adopts the following technical solutions:

[0009] In the first aspect, the present utility model provides a fixture tooling for battery testing, including:

[0010] A fixture main body;

[0011] An adjustable clamping assembly, disposed on the fixture main body, having a clamping member with adjustable height, and the clamping member is used to fix the battery;

[0012] A connection assembly, disposed on the clamping member, for forming an electrical connection with the test instrument and the battery.

[0013] The present utility model realizes the clamping and fixing of batteries of different sizes by setting an adjustable clamping assembly on the fixture main body and adjusting the height of the movable clamping member. At the same time, the height of the connection assembly disposed on the clamping member relative to the battery is also adjusted accordingly, so as to facilitate electrical connection with batteries of different sizes for testing. The fixture tooling for battery testing does not use fixed connection methods such as welding to connect the battery and the test instrument, and can stably conduct tests. After the test, by adjusting the clamping member, the battery can be detached from the fixture tooling intact, which not only protects the battery but also enables the fixture tooling to be reused repeatedly, effectively reducing the manufacturing and use costs and improving the test efficiency.

[0014] The following are the preferred technical solutions of the present utility model, but not the limitations of the technical solutions provided by the present utility model. Through the following technical solutions, the technical objectives and beneficial effects of the present utility model can be better achieved and realized.

[0015] As a preferred technical solution of the present utility model, the fixture main body includes:

[0016] A base;

[0017] A back plate, disposed on the base;

[0018] A support, disposed on the base and connected to the back plate, for fixedly supporting the back plate.

[0019] Preferably, the fixture main body is made of a metal material to ensure the supportability and durability for other structures and components.

[0020] As a preferred technical solution of the present utility model, the adjusting and clamping assembly includes:

[0021] A threaded shaft, disposed on the back plate and perpendicular to the base;

[0022] Sliding tracks, disposed on both sides of the threaded shaft on the back plate and perpendicular to the base;

[0023] A horizontal clamping plate, as the clamping member, and movably disposed on the threaded shaft and the sliding tracks;

[0024] A pressing switch, disposed on the horizontal clamping plate and facing the threaded shaft, for cooperating with the threaded shaft to fix the horizontal clamping plate.

[0025] In the present utility model, by providing a threaded shaft, the horizontal clamping plate can be moved relative to the base in the vertical direction for height adjustment. Since the horizontal clamping plate is relatively large in size, and the pole columns that form an electrical connection with the battery are often at both ends of the horizontal clamping plate, the present utility model respectively provides sliding tracks at both ends of the threaded shaft to facilitate the movement of the horizontal clamping plate during height adjustment. The present utility model further provides a pressing switch, so that after the horizontal clamping plate is adjusted to an appropriate height, the horizontal clamping plate is temporarily fixed by the pressing switch to prevent it from moving, thereby ensuring stability during the test.

[0026] As a preferred technical solution of the present utility model, bolts corresponding to the sliding tracks are provided on the horizontal clamping plate, and the bolts are used to cooperate with the sliding tracks to fix the horizontal clamping plate.

[0027] Furthermore, the utility model is provided with the bolts at both ends of the horizontal clamping plate, so as to further fix the horizontal clamping plate and improve the stability of its fixation.

[0028] As a preferred technical solution of the utility model, a chute is arranged on the horizontal clamping plate, a slider is arranged in the chute, the connecting component is arranged on the slider, and the slider is used to control the horizontal position of the connecting component relative to the battery.

[0029] As a preferred technical solution of the utility model, a fixing mechanism is arranged in the slider, and the fixing mechanism is used to temporarily fix the slider without allowing it to move.

[0030] In order to meet the test requirements of batteries with different width dimensions (different distances between the positive and negative electrode posts), the utility model further arranges the chute and the slider on the clamping piece, so as to facilitate the horizontal movement of the connecting component to adapt to the distance between the positive and negative electrode posts, enable the connecting component to accurately press down to align with the positive and negative electrode posts at both ends of the battery cell, make the contact process between the connecting component and the battery more precise and convenient, ensure full contact with the battery during the test process, and improve the test accuracy.

[0031] As a preferred technical solution of the utility model, the connecting component includes:

[0032] A contact pole;

[0033] An electric coil, arranged at one end of the contact pole;

[0034] A wiring terminal, sleeved on the end of the contact pole with the electric coil, for forming an electrical connection with a test instrument;

[0035] A probe, arranged at the other end of the contact pole away from the electric coil, for forming an electrical connection with the battery.

[0036] The connecting component of the utility model has a structure for electrically connecting with a test instrument and also has a structure for electrically connecting with a battery, so as to electrically connect the test instrument and the battery for testing.

[0037] As a preferred technical solution of the utility model, at least four probe tips are arranged on the probe.

[0038] The number of metal probe tips on the probe of the utility model is four or more, which ensures full contact with the battery during the test process, can improve the test precision, reduce the measurement error, and thus improve the accuracy of the test result.

[0039] As a preferred technical solution of the present utility model, the probe is telescopically arranged at one end of the contact pole, and the connection assembly further includes a spring. The spring is arranged on the contact pole and contacts the probe to realize and buffer the telescoping of the probe.

[0040] By arranging a telescopic structure on the connection assembly and adding a spring, the present utility model can buffer the pressing speed of the probe, avoid excessive pressure and damage to the battery. This design not only protects the performance and service life of the battery, but also improves the safety of the testing process.

[0041] As a preferred technical solution of the present utility model, the wiring terminal is a Kelvin four-wire copper terminal.

[0042] The present utility model preferably sets the wiring terminal as a pure copper wiring terminal suitable for Kelvin four-wire method testing. In the Kelvin four-wire method, four wires are connected to the pure copper wiring terminal. Two of the wires are used to introduce current into the battery through the pure copper wiring terminal, and the other two wires are used to measure the voltage drop across the battery. That is, by applying a small alternating voltage signal across the battery and measuring the voltage drop when the alternating signal passes through the battery to calculate the internal resistance of the battery, and the converted signal is transmitted to the testing device to form data. This measurement method can eliminate the influence of contact resistance and lead resistance in the circuit on the measurement, thereby improving the measurement accuracy. Even in an environment with strong electromagnetic interference, it can maintain a strong anti-interference ability and ensure the stability of the measurement results. In addition, the Kelvin four-wire method is a non-contact measurement method that does not require direct contact with the measured point, so it can avoid measurement errors caused by poor contact or wear and reduce the risk of damage to the battery under test.

[0043] Compared with the prior art solutions, the present utility model has at least the following beneficial effects:

[0044] The adjusting and clamping assembly and the connection assembly on the battery testing fixture tooling of the present utility model can be adjusted in height. Without using fixing methods such as welding to connect the battery and the testing instrument, it can not only meet the clamping and fixing and testing of batteries with different models and height dimensions, but also enable the battery to be detached from the fixture tooling intact, protecting both the battery and allowing the fixture tooling to be reused repeatedly; since this battery testing fixture can adapt to batteries of different sizes and models, it reduces the cost of purchasing different testing fixtures for different battery types. At the same time, the simplified operation process and high testing efficiency also help to reduce the overall production cost, especially suitable for the testing of square batteries of different models and sizes.

[0045] The present utility model facilitates the sliding of the clamping plate by setting a threaded shaft and a sliding track, and sets double measures of bolts and pressing switches to ensure the firm fixation of the battery.

[0046] The utility model is provided with a sliding groove and a sliding block, so that the connecting component can move horizontally to meet the test requirements of batteries of different models and width dimensions.

[0047] The utility model is provided with at least four probe tips on the probe, which improves the test accuracy and reduces the measurement error, thereby improving the accuracy of the test results.

[0048] By arranging a movable and telescopic probe on the connecting component and matching it with a spring, the utility model can buffer the downward pressure speed of the connecting component and avoid damaging the battery when connecting the probe tip to the battery. At the same time, it can effectively protect the battery, extend the service life of the battery and improve the safety of the test process.

[0049] By setting the wiring terminal on the connecting component as a Kelvin four-wire copper terminal, the connecting component can be connected to the test instrument by the Kelvin four-wire method, further improving the accuracy of the test results. Description of the Drawings

[0050] Figure 1 is a front view schematic diagram of a battery test fixture in an embodiment;

[0051] Figure 2 is a top view schematic diagram of a battery test fixture in an embodiment;

[0052] Figure 3 is an assembly schematic diagram of a connecting component and a sliding block in an embodiment;

[0053] Figure 4 is a schematic diagram of a connecting component in an embodiment;

[0054] Figure 5 is a front view schematic diagram of a probe in an embodiment;

[0055] Figure 6 is a front view schematic diagram of a wiring terminal in an embodiment;

[0056] Figure 7 is an assembly schematic diagram of a battery test fixture and a battery to be tested in an embodiment;

[0057] In the figure: 1 - base; 2 - support; 3 - back plate; 4 - threaded shaft; 5 - sliding track; 6 - bolt; 7 - clamping member; 8 - pressing switch; 9 - sliding block; 10 - sliding groove; 11 - contact pole; 12 - probe; 13 - probe tip; 14 - electric coil; 15 - wiring terminal; 16 - battery to be tested; 17 - positive pole of the battery; 18 - negative pole of the battery. Detailed Embodiment

[0058] The technical solution of the present utility model will be further described below through specific embodiments.

[0059] Those skilled in the art should understand that the embodiments are only for helping to understand the present utility model and should not be regarded as specific limitations on the present utility model.

[0060] In the field of battery testing, the design and use of fixtures are crucial for ensuring the accuracy and reliability of test results. Existing battery testing fixtures are usually designed for specific sizes and models of batteries, unable to meet the testing requirements of different types of batteries, greatly limiting the versatility and practicality of the fixtures; some battery testing fixtures use traditional two-probe tips or three-probe tips for testing, with relatively large measurement errors, which may affect the accuracy of test results; at the same time, the existing design of battery testing fixtures may cause relatively large pressure and damage to the batteries during the testing process, affecting the service life and safety of the batteries; and designing and manufacturing special testing fixtures for different types of batteries results in relatively high production costs, increasing the burden on enterprises.

[0061] To solve the problems in the prior art, in some specific embodiments, the present utility model provides a fixture tooling for battery testing, as Figure 1 and Figure 2 and Figure 7 shown, including:

[0062] A fixture main body;

[0063] An adjusting clamping assembly, arranged on the fixture main body, having a clamping member 7 with an adjustable height, and the clamping member 7 is used to fix the battery;

[0064] A connecting assembly, arranged on the clamping member 7, for forming an electrical connection with a test instrument and a battery 16 to be tested.

[0065] In one embodiment, the fixture main body includes:

[0066] A base 1;

[0067] A back plate 3, arranged on the base 1;

[0068] A support 2, arranged on the base 1 and connected to the back plate 3, for fixedly supporting the back plate 3.

[0069] In one embodiment, the adjusting clamping assembly includes:

[0070] A threaded shaft 4, arranged on the back plate 3 perpendicular to the base 1;

[0071] A sliding track 5, arranged on both sides of the threaded shaft 4 on the back plate 3 and perpendicular to the base 1;

[0072] A horizontal clamping plate, serving as the clamping member 7, is movably arranged on the threaded shaft 4 and the sliding track 5;

[0073] A pressing switch 8 is arranged on the horizontal clamping plate and faces the threaded shaft 4, and is used to cooperate with the threaded shaft 4 to fix the horizontal clamping plate.

[0074] In one embodiment, a bolt 6 corresponding to the sliding track 5 is arranged on the horizontal clamping plate, and the bolt 6 is used to cooperate with the sliding track 5 to fix the horizontal clamping plate.

[0075] In one embodiment, a chute 10 is arranged on the horizontal clamping plate, a slider 9 is arranged in the chute 10, the connecting assembly is arranged on the slider 9, and the slider 9 is used to control the horizontal position of the connecting assembly relative to the battery 16 to be tested.

[0076] In one embodiment, a fixing mechanism is arranged inside the slider 9, and the fixing mechanism is used to temporarily fix the slider 9 to prevent it from moving.

[0077] In one embodiment, as Figure 3 and Figure 4 shown, the connecting assembly includes:

[0078] A contact pole 11;

[0079] An electric coil 14 is arranged at one end of the contact pole 11;

[0080] A wiring terminal 15 is sleeved on one end of the contact pole 11 with the electric coil 14, and is used to form an electrical connection with a test instrument;

[0081] A probe 12 is arranged at the other end of the contact pole 11 away from the electric coil 14, and is used to form an electrical connection with the battery 16 to be tested.

[0082] In one embodiment, as Figure 5 shown, at least four probe tips 13 are arranged on the probe 12.

[0083] In one embodiment, the probe 12 is telescopically arranged at one end of the contact pole 11, and the connecting assembly further includes a spring, and the spring is arranged on the contact pole 11 and contacts the probe 12, and is used to buffer the telescoping of the probe 12.

[0084] In one embodiment, as Figure 6 described, the wiring terminal 15 is a Kelvin four-wire copper terminal.

[0085] Example 1

[0086] This embodiment provides a fixture tool for battery testing, as Figures 1-7 shown, including:

[0087] a fixture main body, an adjusting clamping assembly, and a connecting assembly.

[0088] The fixture main body includes a base 1, a back plate 3, and a support 2. The back plate 3 is welded to the base 1. The support 2 is a triangular bracket, welded to the base 1 and fixedly welded to the back plate 3 for supporting the back plate 3. The base 1, the back plate 3, and the support 2 are all made of metal materials to provide the mechanical strength for supporting other components and structures;

[0089] The adjusting clamping assembly includes a threaded shaft 4, sliding tracks 5, a horizontal clamping plate, and a pressing switch 8. The threaded shaft 4 is arranged on the back plate 3 and is perpendicular to the base 1. The sliding tracks 5 are two independent ones, respectively arranged on both sides of the threaded shaft 4 on the back plate 3 and perpendicular to the base 1. The horizontal clamping plate serves as a clamping member 7 and is movably arranged on the threaded shaft 4 and the sliding tracks 5 for height adjustment to fix the battery 16 to be tested. The pressing switch 8 is arranged on the horizontal clamping plate and faces the threaded shaft 4 for cooperating with the threaded shaft 4 to fix the horizontal clamping plate. Bolts 6 corresponding to the sliding tracks 5 are arranged on the horizontal clamping plate, and the bolts 6 are used to cooperate with the sliding tracks 5 to fix the horizontal clamping plate. Two chutes 10 are respectively arranged at both ends of the horizontal clamping plate, and sliders 9 are arranged in the chutes 10. The connecting assembly is arranged on the sliders 9, and the sliders 9 are used to control the horizontal position of the connecting assembly relative to the battery 16 to be tested. A fixing mechanism is arranged in the sliders 9, and the fixing mechanism is used to temporarily fix the sliders 9 so that they do not move;

[0090] The connection component includes a contact pole 11, an electric coil 14, a wiring terminal 15 and a probe 12. The electric coil 14 is arranged at one end of the contact pole 11; the wiring terminal 15 is sleeved on the end of the contact pole 11 with the electric coil 14 for forming an electrical connection with a testing instrument; the probe 12 is telescopically arranged at the other end of the contact pole 11 away from the electric coil 14. The connection component further includes a spring which is arranged on the contact pole 11 and contacts with the probe 12 for buffering the telescopic movement of the probe 12. Four probe tips 13 are arranged on the probe 12 for forming an electrical connection with a battery 16 to be tested, that is, the connection components in the two chutes 10 are respectively and electrically connected to the positive pole column 17 and the negative pole column 18 of the battery 16 to be tested through the probe 12; the wiring terminal 15 is a Kelvin four-wire copper terminal. After sleeving the wiring terminal 15, the connection component is placed on the slider 9 to carry the connection component and control the horizontal movement of the connection component through the slider 9.

[0091] As can be seen from the above, the battery testing fixture of the present utility model can adapt to square batteries of different size models, thereby saving costs, simplifying the operation process and improving the testing efficiency. This makes the testing fixture have a wider applicability and can meet the testing requirements of more types of batteries. The design adopts a four-probe-tip needle testing method to improve the testing accuracy and reduce the measurement error, thereby improving the accuracy of the testing results. In addition, springs are arranged around the probe tips to buffer the pressing speed and avoid damaging the battery, effectively protecting the battery, prolonging the service life of the battery and improving the safety of the testing process. Moreover, after connecting the pole column and the pure copper wiring terminal, the pure copper wiring terminal is connected to the connecting wire of the testing equipment by the Kelvin four-wire method, further improving the accuracy of the testing results. In addition, the battery testing fixture of the present utility model has a certain scalability and can be upgraded and improved according to the development of future battery technologies and market demands to meet the testing requirements of more new types of batteries.

[0092] The present utility model uses the above embodiments to illustrate the detailed structural features of the present utility model, but the present utility model is not limited to the above detailed structural features, that is, it does not mean that the present utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the present utility model, the equivalent replacement of the components selected by the present utility model, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present utility model.

[0093] The preferred embodiments of the present utility model have been described in detail above. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solutions of the present utility model, and these simple modifications all fall within the protection scope of the present utility model.

[0094] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present utility model will not separately describe various possible combination manners.

[0095] Furthermore, any combination can be made among various different embodiments of the present utility model, as long as it does not violate the idea of the present utility model, and it should also be regarded as the content disclosed by the present utility model.

Claims

1. A battery testing fixture, characterized in that: include: The fixture body; An adjustable clamping assembly, arranged on the clamp body, having a clamping member (7) with adjustable height, wherein the clamping member (7) is used to fix the battery; A connecting assembly is arranged on the clamping member (7) and is used to form an electrical connection with a testing instrument and a battery.

2. The battery testing fixture according to claim 1, characterized in that: The fixture body comprises: Base (1); A back plate (3) is arranged on the base (1); The support (2) is arranged on the base (1) and connected to the back plate (3), and is used for fixing and supporting the back plate (3).

3. The battery testing fixture according to claim 2, characterized in that: The adjusting clamping assembly comprises: A threaded shaft (4) is disposed on the back plate (3) and is perpendicular to the base (1); Sliding rails (5) are arranged on both sides of the threaded shaft (4) on the back plate (3) and are perpendicular to the base (1); A horizontal clamping plate, serving as the clamping member (7), and movably disposed on the threaded shaft (4) and the sliding track (5); A clamping switch (8) is arranged on the horizontal clamping plate and faces the threaded shaft (4), and is used to cooperate with the threaded shaft (4) to fix the horizontal clamping plate.

4. The battery testing fixture according to claim 3, characterized in that: The horizontal clamping plate is provided with bolts (6) corresponding to the sliding track (5), and the bolts (6) are used to cooperate with the sliding track (5) to fix the horizontal clamping plate.

5. The battery testing fixture according to any one of claims 3 or 4, characterized in that: The horizontal clamping plate is provided with a slide groove (10), a slider (9) is provided in the slide groove (10), the connecting component is provided on the slider (9), and the slider (9) is used to control the horizontal position of the connecting component relative to the battery.

6. The battery testing fixture according to claim 5, characterized in that: A fixing mechanism is arranged inside the slider (9), and the fixing mechanism is used to fix the slider (9).

7. The battery testing fixture according to any one of claims 1 to 4, characterized in that: The connection component comprises: Contact pole (11); An electric coil (14) is arranged at one end of the contact pole (11); A wiring terminal (15), which is sleeved on one end of the contact pole (11) and has the electric coil (14), and is used to form an electrical connection with a testing instrument; The probe (12) is arranged at the other end of the contact pole (11) away from the electric coil (14) and is used to form an electrical connection with the battery.

8. The battery testing fixture according to claim 7, characterized in that: At least four probe needle tips (13) are arranged on the probe (12).

9. The battery testing fixture according to claim 7, characterized in that: The probe (12) is telescopically arranged at one end of the contact pole (11), and the connection assembly further comprises a spring, which is arranged on the contact pole (11) and in contact with the probe (12) and is used to buffer the telescopic movement of the probe (12).

10. The battery testing fixture according to claim 7, characterized in that: The connection terminal (15) is a Kelvin four-wire copper terminal.

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