Battery thermal runaway detection device

Abstract

The utility model discloses a battery thermal runaway detection device which comprises an upper layer structure, a middle layer structure and a lower layer structure, the middle layer structure comprises a battery detection box body, a communication reserved port and buckles, an L-shaped opening is formed in the upper portion of the battery detection box body, an upper air hole is formed in the top of the battery detection box body, side air holes are formed in the side face of the battery detection box body, the multiple buckles are fixed to the periphery of the battery detection box body, and the buckles are arranged in an upper layer and a lower layer; a communication reserved port is formed in the side face of the middle-layer structure, a clamping groove is formed in the middle-layer structure, and a circuit board is fixedly installed on the clamping groove. The thermal runaway detection device comprises an upper layer structure, a middle layer structure and a lower layer structure which define a detection cavity together to form a closed structure, so that inflexible detection caused by entrance of external foreign matters is prevented, and detection of various thermal runaway parameters can be conveniently realized in the detection cavity; and in addition, quick response can be realized and an alarm can be given out through the sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a battery thermal runaway detection device. Background Art

[0002] Thermal runaway of lithium-ion batteries is one of the main causes of fire accidents. When a lithium-ion battery thermally runs away, it will emit gas and high-temperature organic electrolyte. The gas contains flammable gases such as hydrogen, alkanes, alkenes and alkynes, which are the main combustibles that cause battery fire accidents. In addition, the gas also contains toxic gases such as hydrogen fluoride, hydrogen chloride and carbon monoxide, which are released into the air and cause harm to the human body.

[0003] In actual application, some detection devices can only give an alarm during the thermal runaway stage. However, the time from the opening of the pressure relief valve due to thermal runaway to the occurrence of fire or explosion is very short, so the time left for fire rescue is limited. If not handled properly, the battery can easily experience thermal runaway and even cause explosions and other major safety accidents. In addition, some existing detection devices are large in size, which makes it difficult to install them in the battery pack, and the smoke generated during the battery cell failure stage is smaller.

[0004] During the detection process, the current thermal runaway detection equipment will be affected by electromagnetic interference and the entry of external foreign objects, resulting in ineffective detection, and it is impossible to stably, accurately and quickly detect battery thermal runaway failures and issue an alarm. Utility Model Content

[0005] The utility model provides a battery thermal runaway detection device, which aims to include an upper structure, a middle structure and a lower structure, which together enclose a detection cavity, forming a closed structure to prevent external foreign matter from entering and causing poor detection, and facilitate the detection of various thermal runaway parameters in the detection cavity, and can quickly respond and issue an alarm through sensors.

[0006] A battery thermal runaway detection device, characterized in that it comprises an upper structure, a middle structure and a lower structure;

[0007] The middle-layer structure includes a battery detection box, a communication reserved port and a buckle. A plurality of buckles are fixed around the battery detection box. The buckles are arranged in two layers, upper and lower. A card slot is opened inside the middle-layer structure, and a circuit board is fixedly installed on the card slot.

[0008] The top of the upper structure is provided with an upper cover air port, and the side of the upper structure is provided with a plurality of first openings;

[0009] A side surface of the lower structure is provided with an avoidance opening, and a plurality of second openings are provided on the side surface of the lower structure.

[0010] As a further solution of the utility model, the upper structure is buckled on the upper buckle through the first opening, and the lower structure is buckled on the lower buckle through the second opening.

[0011] As a further solution of the utility model, fixed ear seats are fixed on both sides of the battery detection box.

[0012] As a further solution of the utility model, a sensor is fixedly mounted on the circuit board, and the sensor includes a particle sensor.

[0013] As a further solution of the utility model, a communication reserved opening is opened on the side of the middle structure.

[0014] As a further solution of the utility model, a communication component, a CAN communication component or a network port component is plugged into the communication reserved port.

[0015] As a further solution of the present invention, the sensor further includes one or more of an air pressure sensor, a temperature sensor, a gas sensor or a sound sensor.

[0016] As a further solution of the present utility model, the upper structure and the lower structure are both made of metal.

[0017] As a further solution of the utility model, an L-shaped opening is provided above the battery detection box.

[0018] As a further solution of the utility model, an upper air hole is opened on the top of the battery detection box, and a side air hole is opened on the side of the battery detection box.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) The upper structure and the lower structure of the utility model can simultaneously play a role in preventing electromagnetic interference. A closed structure is formed between the battery detection box and the communication reserved port to prevent the entry of external foreign matter and cause poor detection. A fixed ear seat is fixed on the battery detection box, and a card slot is opened inside the battery detection box. A circuit board is fixedly installed on the card slot to ensure the overall stability of the sensor.

[0021] (2) During detection, the utility model detects gas entering through the first opening at the top and the second opening at the side. If the detection gas is close to the top, it enters from the first opening; if the detection gas is close to the side, it enters from the second opening. Such a design can significantly reduce the detection time, enable quick response and sound an alarm.

[0022] (3) The utility model forms a detection cavity through the upper structure, the middle structure and the lower structure, and realizes the detection of various thermal runaway parameters in the detection cavity. If a circuit board fails, the upper structure can be opened through the upper buckle to perform real-time maintenance on the top of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the overall structure of the communication reserved port of the utility model;

[0025] Figure 3 It is a schematic diagram of the upper structure of the utility model;

[0026] Figure 4 It is a schematic diagram of the lower structure of the utility model;

[0027] Figure 5 This is a schematic diagram of the middle structure of the utility model;

[0028] Figure 6 It is a cross-sectional schematic diagram of the middle layer structure of the utility model;

[0029] Figure 7 It is a schematic diagram of a circuit board of the utility model;

[0030] In the figure: 1-upper structure; 2-middle structure; 3-lower structure; 4-battery detection box; 5-communication reserved port; 6-buckle; 7-upper air hole; 8-side air hole; 9-card slot; 10-circuit board; 11-upper cover air port; 12-first opening; 13-avoidance port; 14-second opening; 15-fixed ear seat. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Please see attached Figure 1-7 , a battery thermal runaway detection device, the thermal runaway detection sensor comprising an upper structure 1, a middle structure 2 and a lower structure 3;

[0035] The middle structure 2 includes a battery detection box 4, a communication reserved opening 5 and a buckle 6. An L-shaped opening is provided on the top of the battery detection box 4. A plurality of buckles 6 are fixed around the battery detection box 4. The buckles 6 are arranged in two layers, and the buckles 6 arranged in the upper and lower layers can easily connect the upper structure 1 and the lower structure 3 to the middle structure 2. A communication reserved opening 5 is provided on the side of the middle structure 2. A card slot 9 is provided inside the middle structure 2. A circuit board 10 is fixedly installed on the card slot 9. A communication component, a CAN communication component or a network port component is plugged into the communication reserved opening 5. A closed structure is formed between the communication reserved opening 5 and the entire battery detection box 4 to prevent foreign objects from entering.

[0036] The upper structure 1 has an upper cover air port 11 on the top, and a plurality of first openings 12 on the side of the upper structure 1; the lower structure 3 has an escape port 13 on the side, and a plurality of second openings 14 on the side of the lower structure 3. Both the upper structure and the lower structure are made of metal, which can prevent electromagnetic interference.

[0037] The circuit board 10 is fixedly mounted with a particle sensor. Specifically, when the battery cell is thermally runaway, the concentration of nanoparticles in the air will change, and then the particle sensor will also change when receiving the laser signal, thereby monitoring the concentration of nanoparticles and providing effective protection for fire prevention and safety.

[0038] The upper structure 1 is buckled on the buckle 6 of the upper layer through the first opening 12, and the lower structure is buckled on the buckle 6 of the lower layer through the second opening 14. When the upper structure 1 is buckled, only one air hole is left on the upper surface for air intake or exhaust. An upper air hole 7 is provided on the top of the battery detection box 4, and a side air hole 8 is provided on the side of the battery detection box 4. If a circuit board fails, the upper structure 1 can be opened through the buckle 6 of the upper layer to conduct real-time inspection on the top of the circuit board 10. During the inspection, the detection gas enters through the first opening 12 on the top and the second opening 14 on the side. If the detection gas is close to the top, it enters from the first opening 12, and if the detection gas is close to the side, it enters from the second opening 14. Such a design can significantly reduce the detection time, and can respond quickly and issue an alarm through the communication interface.

[0039] The battery detection box 4 is fixed with fixed ear seats 15 on both sides. The fixed ear seats 15 pass through the avoidance opening 13. They are used for the installation and fixation of the thermal runaway monitoring sensor at the monitoring site.

[0040] The sensor also includes one or more of an air pressure sensor, a temperature sensor, a gas sensor or a sound sensor. The air pressure sensor is preferred. The air pressure sensor and the temperature sensor can be used as an important criterion for the safety hazard inside the battery pack by monitoring the air pressure and temperature changes inside the battery pack. The sound sensor can easily detect abnormal signals inside the battery pack and can capture the sound of the battery cell pressure relief valve opening at the moment. At this time, the sound is obvious and lasts for a long time. At the same time, it can also capture the sound of the battery PACK pressure relief valve opening at the moment.

[0041] In the specific working process of the sensor, after the safety valve of the lithium-ion battery opens at the beginning of thermal runaway, a variety of gases will be released. Considering the delay effect of the complex structural layout in the battery box on the gas flow, the use of air pressure sensors and temperature sensors can make up for this delay. Once the safety valve of the lithium-ion battery is opened, the released gas will quickly transmit the pressure information to every corner of the battery box through the force between molecules, causing the average air pressure in the battery box to increase instantly. Due to the response speed of the air pressure sensor and temperature sensor, the alarm speed of thermal runaway of the lithium-ion battery is improved, which is extremely important for ternary batteries that are prone to thermal runaway and severe thermal runaway.

[0042] Finally, it should be noted that the circuit board 10, air pressure sensor, particle sensor and other components involved in the utility model are all universal standard parts or components known to technical personnel in this field, and their structures and principles are all known to technical personnel in this field through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adaptive controllers and power supplies, are connected through wires. The specific connection means should refer to the working principle of the utility model. The electrical connection between each electrical component is completed in a sequential working order, and the detailed connection means are all well-known technologies in the field.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery thermal runaway detection device, characterized in that: It includes an upper structure (1), a middle structure (2) and a lower structure (3); The middle layer structure (2) comprises a battery detection box (4), a communication reserved opening (5) and a buckle (6); a plurality of buckles (6) are fixed around the battery detection box (4); the buckles (6) are arranged in two layers, upper and lower; a card slot (9) is provided inside the middle layer structure (2); a circuit board (10) is fixedly mounted on the card slot (9); The top of the upper structure (1) is provided with an upper cover air port (11), and the side of the upper structure (1) is provided with a plurality of first openings (12); The side surface of the lower structure (3) is provided with an avoidance opening (13), and the side surface of the lower structure (3) is provided with a plurality of second openings (14).

2. A battery thermal runaway detection device according to claim 1, characterized in that: The upper structure (1) is buckled onto the buckle (6) of the upper layer through the first opening (12), and the lower structure is buckled onto the buckle (6) of the lower layer through the second opening (14).

3. A battery thermal runaway detection device according to claim 1, characterized in that: Fixed ear seats (15) are fixed on both sides of the battery detection box (4).

4. A battery thermal runaway detection device according to claim 1, characterized in that: A sensor is fixedly mounted on the circuit board (10), and the sensor comprises a particle sensor.

5. A battery thermal runaway detection device according to claim 1, characterized in that: A communication reserved opening (5) is provided on the side of the middle layer structure (2).

6. A battery thermal runaway detection device according to claim 5, characterized in that: The communication reserved port (5) is plugged with a communication component, a CAN communication component or a network port component.

7. A battery thermal runaway detection device according to claim 4, characterized in that: The sensor also includes one or more of an air pressure sensor, a temperature sensor, a gas sensor or a sound sensor.

8. A battery thermal runaway detection device according to claim 1, characterized in that: The upper structure (1) and the lower structure (3) are both made of metal.

9. A battery thermal runaway detection device according to claim 1, characterized in that: An L-shaped opening is provided on the top of the battery detection box (4).

10. A battery thermal runaway detection device according to claim 1, characterized in that: An upper air hole (7) is provided on the top of the battery detection box (4), and a side air hole (8) is provided on the side of the battery detection box (4).

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