Short-circuit test fixture for cylindrical battery

Abstract

The utility model discloses a short circuit test fixture of a cylindrical battery, which comprises a battery holder and a short circuit tester, the battery holder is used for supporting the cylindrical battery, the short circuit test fixture also comprises a bottom plate, the battery holder is arranged on the bottom plate and above the bottom plate, two sides of the battery holder are provided with an anode probe seat and a cushion block, the anode probe seat is provided with a first probe, and the cushion block is provided with a second probe. A first probe is installed on the cushion block and abuts against one end of the cylindrical battery, a second probe is installed on the cushion block and abuts against the other end of the cylindrical battery, and a quick clamp is arranged on the cushion block and used for pushing, pulling and fastening the cylindrical battery. According to the utility model, through the arrangement of the rapid clamp, the clamp is compatible with various battery models, high in test efficiency, high in precision, strong in durability, convenient to operate, wide in application range, and convenient to replace when being used for testing, and can be applied to short-circuit testers of various models to test cylindrical batteries.

Description

Technical Field

[0001] This utility model relates to the field of battery safety testing, specifically a short-circuit test fixture for cylindrical batteries. Background Technology

[0002] Cylindrical shape is one of the common shapes for lithium-ion batteries. During battery production and R&D, battery safety checks and tests are typically conducted to ensure product safety performance, guaranteeing user satisfaction. In the safety testing of cylindrical steel-cased lithium-ion batteries, external short-circuit testing is the most common method for verifying product safety performance. Due to the inherent characteristics of the product, external short circuits between the positive and negative terminals are the most likely cause of safety accidents during use. Therefore, the safety status of cylindrical lithium-ion batteries after an external short circuit is a fundamental safety performance indicator. The principle of external short-circuit testing is to artificially bring the positive and negative terminals of the battery into direct external contact, thus creating a short circuit. During an external short circuit, a large instantaneous current is generated, causing a rapid rise in local battery temperature, potentially leading to phenomena such as leakage, fire, or explosion. By monitoring the battery's state after a short circuit, safety features can be incorporated into the battery design to ensure that leakage, fire, or explosion does not occur during testing or use.

[0003] The short-circuit testing device mainly consists of a mounting fixture and a short-circuit tester (with a built-in resistance box, ammeter, and voltmeter). The mounting fixture is the core component of the grooving machine, comprising a battery holder, probes, a positive probe holder, a base plate, a base, and corresponding nuts and springs. The short-circuit tester is the control system for the short-circuit test. It consists of an externally connected resistance box, ammeter, and voltmeter, providing control to initiate the short-circuit test on the target battery. The battery is externally contacted via the start button on the control board. The fixture is a crucial component of the short-circuit test; its shape and size determine the shape and size of the target battery to which the short-circuit test can be performed. Existing test fixtures for testing cylindrical battery steel casings mostly employ traditional wooden bases, plastic, or alloy clamps. During short-circuit testing, the wooden base is prone to cracking, breaking, or even catching fire due to the potential for fire or explosion caused by a short circuit, rendering the fixture unusable. Furthermore, traditional short-circuit test fixtures, due to their material properties, have poor shrinkage flexibility, relying solely on probe retraction to adjust the sample's size and position. This makes them unsuitable for testing various battery models; for example, a fixture for 18650 batteries cannot be used for 21700 or larger batteries. Because currently used test fixtures are prone to failure, highly specific, and unable to meet the needs of multi-model testing, they incur unnecessary material and labor costs, resulting in low testing efficiency and inflexible operation. Therefore, this utility model is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a short-circuit test fixture for cylindrical batteries, which can effectively improve the accuracy of the test.

[0005] To solve the above technical problems, the following technical solution is adopted:

[0006] A short-circuit test fixture for a cylindrical battery includes a battery holder and a short-circuit tester. The battery holder supports the cylindrical battery and includes a base plate. The battery holder is placed on the base plate. Positive electrode probe holders and pads are arranged on the top of the base plate and on both sides of the battery holder. A first probe is arranged on the positive electrode probe holder and abuts against one end of the cylindrical battery. A second probe is installed on the pad and abuts against the other end of the cylindrical battery. A quick clamp is arranged on the pad and is used to push and pull to secure the cylindrical battery. The connection wire of the resistor box built into the short-circuit tester is installed at both ends of the first and second probes of the cylindrical battery.

[0007] Preferably, the quick clamp is provided with a mechanical handle.

[0008] Preferably, the quick clamp is a quick clamp made of 304 stainless steel.

[0009] Preferably, the quick clamp is a push-pull type fixing clamp.

[0010] Furthermore, it also includes a hexagonal nut, through which probe one is fixedly connected to the positive probe holder.

[0011] Furthermore, a base is provided below the base plate.

[0012] Preferably, a connecting rod is provided on the right side of the base below the quick clamp, and a tension spring is connected to the connecting rod. The other end of the tension spring is connected to the mechanical handle.

[0013] Furthermore, the quick clamp is provided with mounting holes, through which the tension spring is connected to the mechanical handle.

[0014] Beneficial technical effects:

[0015] This utility model features a quick-clamp mechanism that is compatible with various battery models. It offers high testing efficiency, high precision, strong durability, convenient operation, and wide applicability. The clamp is easy to use and can be applied to various types of short-circuit testers for testing cylindrical batteries. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the short-circuit test fixture for the cylindrical battery of this utility model.

[0018] Figure 2 This is a schematic diagram of the quick clamp structure of this utility model.

[0019] In the diagram, 1. Connecting rod; 2. Battery holder; 3. Probe 1; 4. Probe 2; 5. Positive probe holder; 6. Base plate; 7. Pad; 8. Base; 9. Mounting hole; 10. Cylindrical battery; 11. Hex nut; 12. Tension spring; 13. Mechanical handle; 14. Quick clamp. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] Reference Figures 1-2 As shown, a short-circuit test fixture for a cylindrical battery includes a battery holder 2 and a short-circuit tester. The battery holder 2 supports the cylindrical battery 10, and the short-circuit tester is used to test the short-circuit condition of the cylindrical battery 10. It also includes a base plate 6, on which the battery holder 2 is placed. Above the base plate 6 and on both sides of the battery holder 2, a positive electrode probe holder 5 and a pad block 7 are provided. A probe 3 is provided on the positive electrode probe holder 5, and the probe 3 abuts against one end of the cylindrical battery 10. A probe 4 is installed on the pad block 7, and the probe 4 abuts against the other end of the cylindrical battery 10. A quick clamp 14 is provided on the pad block 7, which is used to push and pull to fasten the cylindrical battery 10. A mechanical handle 13 is provided on the quick clamp 14. The quick clamp 14 is a quick clamp made of 304 stainless steel. It is a push-pull type fixing clamp, which is an existing product that is sold online and in hardware stores. It mainly serves the function of pushing and pulling to fasten.

[0022] It also includes a hexagonal nut 11, through which probe 3 is fixedly connected to the positive probe base 5.

[0023] The short-circuit tester is existing technology and is not the focus of this utility model. The short-circuit tester is equipped with a built-in resistance box.

[0024] The connection wires of the built-in resistance box of the short-circuit tester are installed at both ends of probe 3 and probe 4 of the cylindrical battery 10.

[0025] A base 8 is provided below the base plate 6. A connecting rod 1 is provided on the right side of the base 8 below the quick clamp 14. A tension spring 12 is connected to the connecting rod 1. The other end of the tension spring 12 is connected to the mechanical handle 13. The tension spring 12 serves to reset the mechanical handle 13. A mounting hole 9 is provided on the quick clamp 14. The tension spring 12 is connected to the mechanical handle 13 through the mounting hole 9.

[0026] The working principle of this utility model of short-circuit test fixture for cylindrical batteries is to fix the cylindrical battery 10 in the battery holder 2 inside the mold by the stretching action of the mechanical handle 13. By adjusting the pressure, the required battery shape and size can be selected. In addition, the connection wire of the resistor box built into the short-circuit tester is installed at both ends of the probe 3 and probe 4 of the cylindrical battery 10. The short-circuit test is performed by turning on the start switch on the instrument control panel.

[0027] The placement and removal of the cylindrical battery 10 includes the following steps: With the short-circuit tester stationary, manually pull the battery holder 2 upward using the mechanical handle 13 (in the figure, the mechanical handle 13 is at position A), place the cylindrical battery 10 into the battery holder 2 in the order of positive and negative terminals, press down the mechanical handle 13 (in the figure, the mechanical handle 13 is at position B), remove the handle, and the tension spring 12 will stabilize the mechanical handle 13, thus completing the positioning and placement of the cylindrical battery 10.

[0028] If you need to connect external devices such as recorders, simply install the connection cable on the surface of the cylindrical battery 10 as required.

[0029] The steps for performing a short-circuit test using a short-circuit test fixture for cylindrical batteries are as follows:

[0030] After the cylindrical battery 10 is installed, manually operate the control panel to select the required short-circuit time, resistance box value, and box temperature. Once the box environment reaches the target state, select the short-circuit start switch to perform a short-circuit test. Different resistance values ​​can be selected according to different device connections to obtain different short-circuit currents. Record the short-circuit test data according to the performance of the short-circuit test equipment itself, including the surface temperature of the cylindrical battery 10, the box ambient temperature, voltage, current, and battery surface condition. Based on the test data and battery surface condition, determine the safety performance of the cylindrical battery 10.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A short circuit test jig for a cylindrical battery comprising a battery holder (2) and a short circuit tester, characterized in that, The battery holder (2) is used for supporting the cylindrical battery (10), further comprising a bottom plate (6), the battery holder (2) is placed on the bottom plate (6), a positive probe holder (5) and a cushion block (7) are arranged above the bottom plate (6) and on both sides of the battery holder (2), a probe one (3) is arranged on the positive probe holder (5), the probe one (3) abuts against one end of the cylindrical battery (10), a probe two (4) is installed on the cushion block (7), the probe two (4) abuts against the other end of the cylindrical battery (10), a quick clamp (14) is arranged on the cushion block (7), the quick clamp (14) is used for pushing and pulling the fastening cylindrical battery (10), and the connecting line of the resistance box built in the short circuit tester is installed at both ends of the probe one (3) and the probe two (4) of the cylindrical battery (10).

2. The short circuit test fixture for cylindrical batteries of claim 1, wherein, The quick clamp (14) is provided with a mechanical handle (13).

3. The short circuit test fixture for cylindrical batteries of claim 2, wherein, The quick clamp (14) is a quick clamp made of 304 stainless steel.

4. The short circuit test fixture for cylindrical batteries of claim 3 wherein, The quick clamp (14) is a push-pull type fixing and pressing device.

5. The short circuit test fixture for cylindrical batteries of claim 1 wherein, Further comprising a hexagon nut (11), the probe one (3) is fixedly connected with the positive probe holder (5) through the hexagon nut (11).

6. The short circuit test fixture for cylindrical batteries of claim 1, wherein, The bottom plate (6) is provided with a base (8) below.

7. The short circuit test fixture for cylindrical batteries of claim 6 wherein, The right side of the base (8) below the quick clamp (14) is provided with a connecting rod (1), the connecting rod (1) is connected with a tension spring (12), and the other end of the tension spring (12) is connected with the mechanical handle (13).

8. The short circuit test fixture for cylindrical batteries of claim 7, wherein, The quick clamp (14) is provided with a mounting hole (15), and the tension spring (12) is connected with the mechanical handle (13) through the mounting hole (15). The quick clamp (14) is provided with a mounting hole (15), and the tension spring (12) is connected with the mechanical handle (13) through the mounting hole (15).

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