A detection device for preventing battery thermal runaway

Abstract

The utility model discloses a detection device of preventing battery thermal runaway, including a plurality of strain sensor of setting in battery shell material, the strain sensor interval connection forms strain gauge resistance R1, the front end of battery is equipped with the input and output of strain gauge resistance R1, strain gauge resistance R1 and fixed resistance R2, fixed value resistance R3, fixed resistance R4 constitute bridge measurement circuit. The utility model discloses a strain sensor is embedded in the inside of battery shell in series connection mode and constitutes bridge measurement circuit, and the tiny deformation caused by the internal pressure change of battery is perceived in real time, thereby make the mechanical deformation stage before the gas leakage of battery can realize early detection and early warning, and then reach the purpose of significantly prolonging early warning response time, effectively avoiding thermal runaway and explosion combustion accident.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal runaway technology, and more specifically, to a detection device for preventing battery thermal runaway. Background Technology

[0002] Batteries are widely used in various electronic devices, electric vehicles, and energy storage systems. However, thermal runaway safety remains a key hidden danger restricting the industry's development. The mechanism of battery thermal runaway typically begins with internal side reactions leading to pressure buildup and mechanical deformation, such as casing bulging or structural deformation. This subsequently releases flammable gases such as hydrogen and methane. Once these gases reach their combustion or explosion concentration limits in the air, they can rapidly ignite a fire or even an explosion. Currently, the mainstream technology for detecting and monitoring battery thermal runaway relies on detecting the concentration of leaked flammable gases. However, this method has a significant time lag: gas sensors only trigger alarms when the flammable gas has leaked to a certain level, often nearing the critical point of thermal runaway. The remaining response time is extremely short, sometimes only a few seconds, making effective early warning and risk intervention difficult, and unable to prevent disasters. Therefore, a highly reliable monitoring method capable of identifying signs of thermal runaway at an earlier stage is urgently needed to compensate for the shortcomings of existing gas detection technologies and improve the safety protection level of battery systems. Utility Model Content

[0003] In view of the above-mentioned technical problems in related technologies, this utility model proposes a detection device for preventing battery thermal runaway, which can overcome the above-mentioned shortcomings of the prior art.

[0004] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A detection device for preventing battery thermal runaway includes several strain sensors disposed in the battery casing material. The strain sensors are connected in series to form a strain gauge resistor R1. The front end of the battery is provided with an input terminal and an output terminal of the strain gauge resistor R1. The strain gauge resistor R1, together with a fixed resistor R2, a fixed value resistor R3, and a fixed resistor R4 around the battery, constitute a bridge measurement circuit.

[0005] Furthermore, the strain sensor is embedded in the battery's casing material by etching.

[0006] Furthermore, the surface of the battery includes an upper surface or a lower surface.

[0007] Furthermore, the strain sensor is located in a deformable part of the battery casing.

[0008] Furthermore, one end of the strain gauge resistor R1 is connected to one end of the fixed resistor R2 and the resistor R... LOne end of the strain gauge resistor R1 is connected to the fixed resistor R3 and the negative terminal of the power supply E, respectively. The other end of the fixed resistor R3 is connected to the resistor R... L The other end of the resistor is connected to one end of the fixed resistor R4, and the positive terminal of the power supply E is connected to the other end of the fixed resistor R4 and the other end of the fixed resistor R2, respectively.

[0009] Furthermore, the battery can be button-shaped, cylindrical, sheet-shaped, rectangular, or square.

[0010] The beneficial effects of this invention are as follows: By embedding strain sensors in series inside the battery casing to form a bridge measurement circuit, this invention can detect minute deformations caused by changes in internal pressure in the battery in real time. This allows for early detection and warning during the mechanical deformation stage before gas leakage occurs, significantly extending the warning response time and effectively preventing thermal runaway and explosion / combustion accidents. This invention uses a low-cost method to greatly improve battery reliability and hazard monitoring, enhancing the safety of all battery-related devices and resulting in significant social benefits. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the detection device for preventing battery thermal runaway according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the detection device for preventing battery thermal runaway according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the detection device for preventing battery thermal runaway according to an embodiment of the present invention. Figure 2 ; In the diagram: 1. Battery; 2. Strain sensor; 3. Strain gauge resistor R1; 4. Fixed resistor R 2； 5. Fixed resistor R3; 6. Fixed resistor R4; 7. Resistor R L . Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0014] like Figure 1-3 As shown, a detection device for preventing battery thermal runaway according to an embodiment of the present invention includes a plurality of strain sensors 2 disposed in the casing material of a battery 1. The strain sensors 2 are connected in series to form a strain gauge resistor R13. The front end of the battery 1 is provided with an input terminal and an output terminal of the strain gauge resistor R13. The strain gauge resistor R13, together with a fixed resistor R24, a fixed value resistor R35, and a fixed resistor R46 around the battery 1, constitute a bridge measurement circuit.

[0015] Furthermore, the strain sensor 2 is embedded in the casing material of the battery 1 by etching.

[0016] Furthermore, the surface of the battery 1 includes an upper surface or a lower surface.

[0017] Furthermore, the strain sensor 2 is disposed in a deformable part of the battery casing 1.

[0018] Furthermore, one end of the strain gauge resistor R13 is connected to one end of the fixed resistor R24 ​​and the resistor R L One end of the 7 is connected, and the other end of the strain gauge resistor R13 is connected to one end of the fixed resistor R35 and the negative terminal of the power supply E, respectively. The other end of the fixed resistor R35 is connected to the resistor R L The other end of 7 is connected to one end of the fixed resistor R46, and the positive terminal of the power supply E is connected to the other end of the fixed resistor R46 and the other end of the fixed resistor R24.

[0019] Furthermore, the battery can be button-shaped, cylindrical, sheet-shaped, rectangular, or square.

[0020] To facilitate understanding of the above-mentioned technical solutions of this utility model, the following detailed description of the above-mentioned technical solutions of this utility model is provided through specific usage methods.

[0021] In practical application, according to the detection device for preventing battery thermal runaway described in this utility model, strain gauges are etched or embedded in the battery casing / packaging material. When the internal pressure of the battery increases, the battery expands, the strain gauges deform, and the resistance increases. Figure 1 and Figure 2 .

[0022] The measurement uses the principle of a bridge measurement circuit, such as... Figure 3 In this circuit, R1 is the strain gauge resistance, and R2, R3, and R4 are fixed resistors. When the strain gauge deforms, the bridge balance is disrupted, and the circuit outputs a measurement signal. The greater the strain gauge deformation, the greater the mechanical deformation of the battery, and the stronger the output signal. This allows for timely and effective monitoring and detection of the battery's mechanical deformation. The measurement uses the Wheatstone bridge principle; under normal conditions, the four resistors form a balanced bridge. A resistor can be installed on the battery surface through printing, bonding, or other processes. When the battery deforms, this strain gauge resistor is stretched, its resistance increases, the bridge balance is disrupted, and a detection signal is output. The other three resistors are placed around the battery. This application provides a detection signal before the battery experiences thermal runaway, when mechanical deformation occurs, facilitating timely measures to prevent thermal runaway and subsequent dangers.

[0023] Strain gauge circuits can be bonded and reinforced to the battery surface through etching, embedding, and other processes, offering higher sensitivity, especially in areas prone to significant battery deformation. The strain gauge layout can be geometrically modified based on factors such as the battery's casing shape, material, and capacity to maximize sensitivity. For example... Figure 1-2 As shown.

[0024] The design structure of this utility model can be used not only for small household appliance batteries, but also for commercial, vehicle and industrial power batteries.

[0025] This utility model can be used in button, cylindrical, sheet, rectangular, and square batteries and battery packs.

[0026] In summary, by employing the technical solution described above, and embedding strain sensors in series within the battery casing to form a bridge measurement circuit, the minute deformations caused by internal pressure changes in the battery can be sensed in real time. This allows for early detection and warning during the mechanical deformation stage before gas leakage occurs, significantly extending the warning response time and effectively preventing thermal runaway and explosion / combustion accidents. This invention utilizes a low-cost method to greatly improve battery reliability and hazard monitoring, enhancing the safety of all battery-related devices and resulting in significant social benefits.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detection device for preventing battery thermal runaway, characterized in that, The battery (1) includes several strain sensors (2) disposed in the outer shell material of the battery (1). The strain sensors (2) are connected in series to form a strain gauge resistor R1 (3). The front end of the battery (1) is provided with the input terminal and the output terminal of the strain gauge resistor R1 (3). The strain gauge resistor R1 (3) together with the fixed resistor R2 (4), the fixed value resistor R3 (5), and the fixed resistor R4 (6) around the battery (1) constitute a bridge measurement circuit. The strain sensor (2) is embedded in the casing material of the battery (1) by etching; The strain sensor (2) is located in a deformable part of the battery (1) casing.

2. The detection device for preventing battery thermal runaway according to claim 1, characterized in that, The surface of the battery (1) includes an upper surface or a lower surface.

3. The detection device for preventing battery thermal runaway according to claim 1, characterized in that, One end of the strain gauge resistor R1 (3) is connected to one end of the fixed resistor R2 (4) and the resistor R L One end of (7) is connected, and the other end of the strain gauge resistor R1 (3) is connected to one end of the fixed resistor R3 (5) and the negative terminal of the power supply E, respectively. The other end of the fixed resistor R3 (5) is connected to the resistor R L (7) is connected to one end of the fixed resistor R4 (6), and the positive terminal of the power supply E is connected to the other end of the fixed resistor R4 (6) and the other end of the fixed resistor R2 (4).

4. The detection device for preventing battery thermal runaway according to claim 1, characterized in that, The battery can be button-shaped, cylindrical, sheet-shaped, rectangular, or square.

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