Abuse gas and temperature in-situ detection device for cylindrical lithium ion battery

Abstract

The utility model discloses a cylindrical lithium ion battery abuse gas and temperature in-situ detection device, which comprises a battery clamp and an acquisition controller, a flow guide pipeline clamp is arranged above the battery clamp, a battery jar is arranged in the middle of the battery clamp, a cylindrical battery is arranged in the middle of the battery jar, and the cylindrical lithium ion battery is arranged in the acquisition controller. A flow guide pipeline body is arranged on the outer surface of the upper end of the flow guide pipeline clamp. The cylindrical lithium ion battery abuse gas and temperature in-situ detection device provided by the utility model realizes in-situ synchronous detection of battery surface temperature, exhaust temperature and gas components, comprehensively represents a thermal runaway process, monitors temperature and gas changes in real time, can identify thermal runaway symptoms in advance, improves the use safety of the battery, and improves the safety of the battery. The device is suitable for abuse testing of various cylindrical lithium ion batteries, the heating power is adjustable, different experiment requirements are met, rich data are provided for battery thermal runaway mechanism research, safety evaluation and protection design, and the device has remarkable engineering application potential.

Description

Technical Field

[0001] This utility model relates to the field of battery safety testing technology, specifically to an in-situ detection device for abuse gases and temperature of cylindrical lithium-ion batteries. Background Technology

[0002] With the widespread use of electric vehicles and energy storage systems, lithium-ion batteries have become the mainstream energy storage device due to their high energy density. However, under abuse conditions such as overcharging, collision, and high temperature, complex chain reactions will occur inside lithium-ion batteries, generating a large amount of gas and accompanied by a sharp rise in temperature, which may eventually lead to fire or explosion.

[0003] To address this, we propose an in-situ detection device for abuse gases and temperature in cylindrical lithium-ion batteries. Utility Model Content

[0004] The main objective of this invention is to provide an in-situ detection device for abuse gases and temperature in cylindrical lithium-ion batteries, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a cylindrical lithium-ion battery abuse gas and temperature in-situ detection device, comprising a battery clamp and a data acquisition controller, wherein a flow guide pipe clamp is provided above the battery clamp, a battery slot is provided in the middle of the battery clamp, a cylindrical battery is provided in the middle of the battery slot, a flow guide pipe body is provided on the upper outer surface of the flow guide pipe clamp, a polyimide heating film and a first temperature sensor are provided on the outer wall of the cylindrical battery, the polyimide heating film is located outside the first temperature sensor, a widening body is provided in the middle of the flow guide pipe body, a gas sensor mounting hole is provided on the outer wall of the widening body, a second temperature sensor is provided on the inner surface of one end of the flow guide pipe body, and a heater is provided on the lower outer surface of the battery clamp.

[0006] Preferably, the outer surfaces of both sides of the battery clamp are detachably connected to the inner surfaces of both sides of the flow guide pipe clamp, and the battery clamp and the battery slot are integrally formed.

[0007] Preferably, the outer surface of the rear end of the acquisition controller is provided with a transmission line, and the acquisition controller is provided with a data acquisition module and a control unit inside.

[0008] Preferably, the outer wall of the cylindrical battery is detachably connected to the outer surface of one end of the polyimide heating film and the first temperature sensor.

[0009] Preferably, the guide pipe body is welded to the expansion body, and the inner wall of the guide pipe body is detachably connected to the outer surface of one end of the second temperature sensor.

[0010] Preferably, the lower outer surface of the battery clamp is detachably connected to one outer surface of the heater, and the heater is electrically connected to the polyimide heating film.

[0011] Beneficial effects

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This device enables in-situ synchronous detection of battery surface temperature, exhaust temperature, and gas composition, comprehensively characterizing the thermal runaway process. Simultaneously, it monitors temperature and gas changes in real time, allowing for early identification of thermal runaway signs and improving battery safety. The widened flow channel effectively buffers gas ejection, protecting sensor stability, while the threaded outlet facilitates gas guidance and subsequent processing. Suitable for abuse testing of various cylindrical lithium-ion batteries, the device features adjustable heating power to meet diverse experimental needs. It provides abundant data for battery thermal runaway mechanism research, safety assessment, and protection design, demonstrating significant engineering application potential. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a structural diagram of the diversion pipe body of this utility model;

[0016] Figure 3 This is a bottom structural diagram of the battery clamp of this utility model.

[0017] In the diagram: 1. Battery clamp; 2. Flow guide pipe clamp; 3. Data acquisition controller; 4. Battery slot; 5. Cylindrical battery; 6. Flow guide pipe body; 7. Polyimide heating film; 8. First temperature sensor; 9. Widening body; 10. Gas sensor mounting hole; 11. Second temperature sensor; 12. Heater. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figure 1-3As shown, a cylindrical lithium-ion battery abuse gas and temperature in-situ detection device includes a battery clamp 1 and a data acquisition controller 3. A flow guide pipe clamp 2 is provided above the battery clamp 1. A battery slot 4 is provided in the middle of the battery clamp 1. A cylindrical battery 5 is provided in the middle of the battery slot 4. A flow guide pipe body 6 is provided on the upper outer surface of the flow guide pipe clamp 2. A polyimide heating film 7 and a first temperature sensor 8 are provided on the outer wall of the cylindrical battery 5. The polyimide heating film 7 is located outside the first temperature sensor 8. An expansion body 9 is provided in the middle of the flow guide pipe body 6. A gas sensor mounting hole 10 is provided on the outer wall of the expansion body 9. A second temperature sensor 11 is provided on the inner surface of one end of the flow guide pipe body 6. A heater 12 is provided on the lower outer surface of the battery clamp 1.

[0020] Furthermore, the outer surfaces of both sides of the battery clamp 1 are detachably connected to the inner surfaces of both sides of the guide pipe clamp 2. The battery clamp 1 and the battery slot 4 are integrally formed. The battery clamp 1 is placed on the experimental platform. The left side can be positioned by a positioning pin, and the right side is fixed by a hexagonal bolt. A through hole of a specific size is provided in the middle position, which can be used to fix the cylindrical battery 5.

[0021] Furthermore, the outer surface of the rear end of the acquisition controller 3 is provided with a transmission line, and the acquisition controller 3 is equipped with a data acquisition module and a control unit. The acquisition controller 3 is electrically connected to the gas sensor and the temperature sensor to record gas concentration, battery surface temperature and exhaust temperature data in real time. It is connected to an external computer through a signal adapter board and a data cable to support data storage and analysis.

[0022] Furthermore, the outer wall of the cylindrical battery 5 is detachably connected to the outer surface of one end of the polyimide heating film 7 and the first temperature sensor 8. The polyimide heating film 7 wraps the battery and provides controllable heating power to simulate abuse conditions. The first temperature sensor 8 is fixed to the surface of the cylindrical battery 5 to monitor changes in the battery surface temperature.

[0023] Furthermore, the guide pipe body 6 is welded to the widened body 9, and the inner wall of the guide pipe body 6 is detachably connected to the outer surface of one end of the second temperature sensor 11. The second temperature sensor 11 is used to measure the temperature when thermal runaway gas is discharged.

[0024] Furthermore, the lower outer surface of the battery clamp 1 is detachably connected to one end of the outer surface of the heater 12. The heater 12 is electrically connected to the polyimide heating film 7. The heater 12 is mainly used to heat the polyimide heating film 7 during use.

[0025] Working principle

[0026] It should be noted that this utility model is an in-situ detection device for abused gas and temperature of cylindrical lithium-ion batteries. A commercially available 18650 / 30A cylindrical lithium-ion battery is used as the experimental subject. Its positive electrode material is ternary NCM, and its negative electrode material is graphite. The battery capacity is 2500mAh. A polyimide heating film 7 (65×45×0.2mm, 20W power) is used to wrap and heat the battery. The first temperature sensor 8 is connected to the cylindrical battery 5 via high-temperature insulating tape. The second temperature sensor 11 is placed at the outlet of the gas guide pipe body 6. The gas sensor is placed at the gas sensor mounting hole 10 on the expansion body 9. The detection is achieved through a signal adapter board and a data converter. The device is connected to a laptop computer. This experiment uses a CO2 gas sensor to test the changes in gas concentration and temperature during the battery's thermal runaway process. Before the experiment, the battery is placed and the device is installed. The temperature controller is set to 180°C. The data acquisition controller 3 (used to collect temperature data) and the self-made gas concentration collection software are turned on. Then, the power switch is turned on and the recording device is started. By integrating the gas sensor and dual temperature sensors, the battery surface temperature, exhaust temperature and gas composition can be detected in situ synchronously, comprehensively characterizing the thermal runaway process. Real-time monitoring of temperature and gas changes can identify signs of thermal runaway in advance, improve battery safety, and is quite practical.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cylindrical lithium-ion battery abuse gas and temperature in-situ detection device, comprising a battery clamp (1) and a collection controller (3), characterized in that: The upper portion of the battery clamp (1) is provided with a flow guide pipe clamp (2), the middle portion of the battery clamp (1) is provided with a battery groove (4), the middle portion of the battery groove (4) is provided with a cylindrical battery (5), the outer surface of the upper end of the flow guide pipe clamp (2) is provided with a flow guide pipe body (6), the outer wall of the cylindrical battery (5) is provided with a polyimide heating film (7) and a first temperature sensor (8), the polyimide heating film (7) is located on the outer side of the first temperature sensor (8), the middle portion of the flow guide pipe body (6) is provided with a widening body (9), the outer wall of the widening body (9) is provided with a gas sensor mounting hole (10), the inner surface of one end of the flow guide pipe body (6) is provided with a second temperature sensor (11), and the outer surface of the lower end of the battery clamp (1) is provided with a heater (12).

2. The in-situ abuse gas and temperature detection device for cylindrical lithium-ion batteries of claim 1, wherein: The outer surfaces of the two sides of the battery clamp (1) are detachably connected with the inner surfaces of the two sides of the flow guide pipe clamp (2), and the battery clamp (1) and the battery groove (4) are integrally formed.

3. The in-situ abuse gas and temperature detection device for cylindrical lithium-ion batteries of claim 1, wherein: The rear end of the collection controller (3) is provided with a transmission line, and the inside of the collection controller (3) is provided with a data collection module and a control unit.

4. The in-situ abuse gas and temperature detection device for cylindrical lithium-ion batteries of claim 1, wherein: The outer wall of the cylindrical battery (5) is detachably connected with the outer surface of one end of the polyimide heating film (7) and the first temperature sensor (8).

5. The in-situ abuse gas and temperature detection device for cylindrical lithium-ion batteries of claim 1, wherein: The flow guide pipe body (6) and the widening body (9) are weldedly connected, and the inner wall of the flow guide pipe body (6) is detachably connected with the outer surface of one end of the second temperature sensor (11).

6. The in-situ abuse gas and temperature detection device for cylindrical lithium-ion batteries of claim 1, wherein: The outer surface of the lower end of the battery clamp (1) is detachably connected with the outer surface of one end of the heater (12), and the heater (12) is electrically connected with the polyimide heating film (7).

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