Battery pack thermal runaway detection device

Abstract

The utility model provides a battery pack thermal runaway detection device, and relates to the technical field of battery pack thermal runaway detection, the battery pack thermal runaway detection device comprises a battery management unit, the battery management unit is connected with a smoke sensor and a liquid leakage sensor, the smoke sensor is used for detecting the smoke condition in a battery pack, and the liquid leakage sensor is used for detecting the liquid leakage condition in the battery pack; the battery management unit is connected with a thermal runaway early warning module, and the thermal runaway early warning module is used for early warning when smoke or liquid leakage occurs in the battery pack. The liquid leakage condition of the liquid cooling system in the battery pack can be monitored in real time through the liquid leakage sensor, early warning is performed through the thermal runaway early warning module once liquid leakage occurs, thermal runaway events caused by liquid leakage are effectively reduced, the smoke condition in the battery pack can be detected in real time through the smoke sensor, the accuracy of thermal runaway early warning is improved, and the safety of the battery pack is improved. And the safety of the battery pack is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack thermal runaway detection technical field, specifically, relate to a battery pack thermal runaway detection device. BACKGROUND

[0002] With the popularity of electric vehicles and electric commercial vehicles, battery safety has become the focus of each enterprise, and the publication of GB38031 standard further promotes the development of battery safety technology. Lithium battery thermal runaway is a serious safety problem, and its process usually includes overheat, release of combustible gas, release of smoke, appearance of open fire, explosion and thermal runaway diffusion. The existing thermal runaway early warning scheme, such as patent CN202010773232.6, mainly monitors the gas pressure, temperature and voltage, however, this scheme has some limitations;

[0003] The change of atmospheric pressure and temperature may affect the gas pressure monitoring of the battery pack, leading to false alarm or missed alarm, secondly, the lithium iron phosphate battery releases a large amount of smoke during thermal runaway, and the smoke particle concentration is high, while the existing early warning system may not be able to detect this smoke in time and effectively, in addition, with the widespread application of liquid cooling scheme in battery pack cooling, the problem of liquid leakage has become a potential safety hazard. Therefore, we improve it and propose a battery pack thermal runaway detection device. SUMMARY

[0004] The utility model aims at: in view of the existing warning system may not be able to detect smoke and liquid leakage in time and effectively.

[0005] In order to realize the above-mentioned invention purpose, the utility model provides battery pack thermal runaway detection device to improve the above-mentioned problem.

[0006] The application is as follows:

[0007] A battery pack thermal runaway detection device, comprising a battery management unit, the battery management unit is connected with a smoke sensor and a liquid leakage sensor, the smoke sensor is used for detecting the smoke condition in the battery pack, the liquid leakage sensor is used for detecting the liquid leakage condition in the battery pack, the battery management unit is connected with a thermal runaway early warning module, the thermal runaway early warning module is used for early warning when smoke or liquid leakage appears in the battery pack.

[0008] As a preferred technical scheme of the application, the battery management unit has a voltage and temperature acquisition unit, which is connected with the battery cell to detect the voltage and temperature information of the battery cell.

[0009] As a preferred technical scheme of the application, it further comprises a protective shell, the battery management unit is installed in the protective shell, and the protective shell is used for protecting the battery management unit.

[0010] As the preferred technical scheme of the present application, the two sides of the protective shell are both provided with openings.

[0011] As the preferred technical scheme of the present application, the opening of one side of the protective shell is provided with a first protective plate, and the smoke sensor is installed on the first protective plate.

[0012] As the preferred technical scheme of the present application, the opening of the other side of the protective shell is provided with a second protective plate, and the second protective plate is provided with an extension piece, and the liquid leakage sensor is installed on the extension piece.

[0013] As the preferred technical scheme of the present application, the extension piece comprises a connecting frame fixedly installed on the second protective plate, and the inner wall of the connecting frame is connected with a connecting plate.

[0014] As the preferred technical scheme of the present application, the side surface of the connecting frame is threadedly connected with a fastening bolt, one end of the fastening bolt penetrates into the connecting frame and is in contact with the connecting plate.

[0015] As the preferred technical scheme of the present application, the protective shell is provided with mounting ears.

[0016] As the preferred technical scheme of the present application, the first protective plate and the second protective plate are connected with the protective shell through damping hinges, the first protective plate and the second protective plate are both provided with lock hooks, and the protective shell is provided with two lock buckles.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] In the scheme of the present application:

[0019] In order to solve the problem that the alarm system in the prior art may not be able to detect smoke and liquid leakage in time and effectively, the liquid leakage sensor can be used to monitor the liquid leakage of the liquid cooling system in the battery pack in real time, and once liquid leakage occurs, the thermal runaway early warning module can be used for early warning, thereby effectively reducing the thermal runaway events caused by liquid leakage. The smoke sensor can detect the smoke in the battery pack in real time, improve the accuracy of thermal runaway early warning, and effectively improve the safety of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application provides a schematic diagram of a battery pack thermal runaway detection device;

[0021] Figure 2 The present application provides a schematic diagram of a battery pack thermal runaway detection device;

[0022] Figure 3Another perspective structural schematic view of the battery pack thermal runaway detection device provided in the application is shown in the figure.

[0023] Figure 4 A structure schematic view of the protective shell, the first protective plate and the second protective plate of the battery pack thermal runaway detection device provided in the application when protecting the battery management unit is shown in the figure.

[0024] Indicated in the figure are:

[0025] 1, battery management unit; 2, smoke sensor; 3, liquid leakage sensor; 4, protective shell; 401, first protective plate; 402, second protective plate; 403, connecting frame; 404, connecting plate; 405, fastening bolt; 407, mounting ear; 408, lock catch; 409, lock hook. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts should belong to the scope of protection of the present application.

[0027] As described in the background, changes in atmospheric pressure and temperature can affect the pressure monitoring of the battery pack, leading to false positives or false negatives. Secondly, lithium iron phosphate batteries release a large amount of smoke during thermal runaway, and the smoke particle concentration is high. However, the existing early warning system may not be able to detect this smoke in a timely and effective manner. In addition, with the widespread use of liquid cooling solutions in battery pack cooling, liquid leakage has become a potential safety hazard.

[0028] To solve this technical problem, the present application provides a battery pack thermal runaway detection device.

[0029] Specifically, please refer to Figure 1 The battery pack thermal runaway detection device specifically comprises:

[0030] A battery management unit 1 is connected with a smoke sensor 2 and a liquid leakage sensor 3. The smoke sensor 2 is used to detect the smoke condition in the battery pack, and the liquid leakage sensor 3 is used to detect the liquid leakage condition in the battery pack. The battery management unit 1 is connected with a thermal runaway early warning module, which is used to warn when smoke or liquid leakage occurs in the battery pack.

[0031] The battery pack thermal runaway detection device provided by the utility model, the present application can monitor the liquid leakage condition of the liquid cooling system in the battery pack in real time through the liquid leakage sensor 3, once the liquid leakage occurs, the thermal runaway early warning module is used for early warning, the thermal runaway event caused by the liquid leakage is effectively reduced, the smoke sensor 2 can detect the smoke condition in the battery pack in real time, the accuracy of the thermal runaway early warning is improved, and the safety of the battery pack is effectively improved.

[0032] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings.

[0033] It should be noted that, in the case of no conflict, the embodiments and the features and technical solutions in the embodiments in the utility model can be combined with each other.

[0034] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0035] Embodiment 1, please refer to Figure 1 A battery pack thermal runaway detection device, including battery management unit 1, battery management unit 1 is connected with smoke sensor 2 and liquid leakage sensor 3, smoke sensor 2 is used for detecting the smoke condition in the battery pack, liquid leakage sensor 3 is used for detecting the liquid leakage condition in the battery pack, battery management unit 1 is connected with thermal runaway early warning module, thermal runaway early warning module is used for early warning when the smoke or liquid leakage appears in the battery pack, battery management unit 1 is BMS battery manager, and thermal runaway early warning module is a sound and light alarm.

[0036] Further, as shown in Figure 1 Battery management unit 1 has voltage and temperature acquisition unit, voltage and temperature acquisition unit is used for connecting with the battery pack's electric core, to detect the voltage and temperature information of the electric core, when the voltage and temperature information of the electric core exceeds the threshold value, in combination with the smoke condition, real-time more accurate early warning.

[0037] Embodiment 2, the battery pack thermal runaway detection device provided in embodiment 1 is further optimized, specifically, as shown in Figures 2-3 It further includes protective shell 4, battery management unit 1 is installed in protective shell 4, and protective shell 4 is used for the protection of battery management unit 1.

[0038] Further, as shown in Figures 2-3 The two sides of protective shell 4 are both provided with openings, and the openings facilitate the wiring of battery management unit 1.

[0039] Further, as shown in Figure 2As shown in the drawings, the first protection plate 401 is installed on one side of the protection shell 4, the smoke sensor 2 is installed on the first protection plate 401, the first protection plate 401 is used for protection of the opening on one side of the protection shell 4, and the first protection plate 401 is also used for supporting the smoke sensor 2.

[0040] Further, as shown in the drawings, Figure 3 As shown in the drawings, the second protection plate 402 is installed on the other side of the protection shell 4, the second protection plate 402 is provided with an extension piece, the liquid leakage sensor 3 is installed on the extension piece, the second protection plate 402 is used for protection of the opening on the other side of the protection shell 4, and the second protection plate 402 is also used for supporting the smoke sensor 2 in cooperation with the extension piece.

[0041] Further, as shown in the drawings, Figure 3 As shown in the drawings, the extension piece comprises a connecting frame 403 fixedly installed on the second protection plate 402, the inner wall of the connecting frame 403 is connected with a connecting plate 404 in a penetrating mode, the liquid leakage sensor 3 is installed on the connecting plate 404, and the connecting plate 404 is movable up and down to adjust the position of the liquid leakage sensor 3 according to the condition in the battery pack.

[0042] Further, as shown in the drawings, Figure 3 As shown in the drawings, the side surface of the connecting frame 403 is threadedly connected with a fastening bolt 405, one end of the fastening bolt 405 penetrates into the connecting frame 403 and is in contact with the connecting plate 404, the position of the connecting plate 404 can be fixed through the fastening bolt 405, and the connecting plate 404 can be pulled after the fastening bolt 405 is loosened.

[0043] In the third embodiment, the battery pack thermal runaway detection device provided in the first or second embodiment is further optimized, and specifically, as shown in the drawings, Figures 2-3 As shown in the drawings, the protection shell 4 is provided with a mounting lug 407, the mounting lug 407 is used in cooperation with a bolt to install the protection shell 4 in the shell.

[0044] Further, as shown in the drawings, Figures 2-3 As shown in the drawings, the first protection plate 401 and the second protection plate 402 are connected with the protection shell 4 through damping hinges, the first protection plate 401 and the second protection plate 402 are provided with a lock hook 409, the protection shell 4 is provided with two lock buckles 408, after the first protection plate 401 and the second protection plate 402 are closed, the two lock buckles 408 are buckled with the two lock hooks 409 respectively, so that the positions of the first protection plate 401 and the second protection plate 402 are fixed.

[0045] The use process of the battery pack thermal runaway detection device is as follows:

[0046] The protective shell 4 is installed in the battery pack shell through bolts and mounting ears 407, the connecting plate 404 is pushed after the fastening bolt 405 is loosened, the liquid leakage sensor 3 is lowered and the liquid leakage sensor 3 is close to the bottom of the battery pack shell, so that the liquid leakage sensor 3 detects the liquid leakage in the battery pack shell, and the first protective plate 401 and the second protective plate 402 are fixed with the shell of the battery pack by using adhesive tape, and the protective shell 4 can be used;

[0047] Before the application is installed and used, the openings on both sides of the protective shell 4 are protected by the first protective plate 401 and the second protective plate 402, that is, Figure 4 As shown, when the mode of the application needs to be switched from Figure 3 to Figure 4 , the fastening bolt 405 is loosened and the liquid leakage sensor 3 is pushed upwards so that the liquid leakage sensor 3 is within the range of the second protective plate 402, and then the fastening bolt 405 is tightened, the second protective plate 402 and the first protective plate 401 are closed, and the lock catch 408 and the lock hook 409 are buckled together, and when used, the lock catch 408 is opened so that the lock catch 408 and the lock hook 409 are separated, the first protective plate 401 and the second protective plate 402 are opened, and the fastening bolt 405 is loosened to adjust the position of the connecting plate 404 and the liquid leakage sensor 3.

[0048] In the utility model, unless there is definite stipulation and limitation, the terms "installation", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or it can be detachable connection, or it can be integrated; it can be mechanical connection, or it can be electrical connection or communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specified. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] Obviously, the above described embodiments are only part of the embodiments of the utility model, not all the embodiments, the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model. The utility model can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or make equivalent replacement to some technical features. Any equivalent structure made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection range of the utility model.

Claims

1. A battery pack thermal runaway detection apparatus, comprising: The battery management unit (1) is connected with a smoke sensor (2) and a liquid leakage sensor (3), the smoke sensor (2) is used for detecting the smoke condition in the battery pack, the liquid leakage sensor (3) is used for detecting the liquid leakage condition in the battery pack, and the battery management unit (1) is connected with a thermal runaway early warning module.

2. The battery pack thermal runaway detection device of claim 1, wherein, The battery management unit (1) has a voltage and temperature acquisition unit connected with the battery cell to detect the voltage and temperature information of the battery cell.

3. The battery pack thermal runaway detection device of claim 1, wherein, Further comprising a protective shell (4), the battery management unit (1) is installed in the protective shell (4), and the protective shell (4) is used for protecting the battery management unit (1).

4. The battery pack thermal runaway detection device of claim 3, wherein, Both sides of the protective shell (4) are open.

5. The battery pack thermal runaway detection device of claim 4, wherein, A first protective plate (401) is installed on one side of the opening of the protective shell (4), and the smoke sensor (2) is installed on the first protective plate (401).

6. The battery pack thermal runaway detection device of claim 5, wherein, A second protective plate (402) is installed on the other side of the opening of the protective shell (4), the second protective plate (402) is provided with an extension piece, and the liquid leakage sensor (3) is installed on the extension piece.

7. The battery pack thermal runaway detection device of claim 6, wherein, The extension piece includes a connecting frame (403) fixedly installed on the second protective plate (402), the inner wall of the connecting frame (403) is connected with a connecting plate (404), and the liquid leakage sensor (3) is installed on the connecting plate (404).

8. The battery pack thermal runaway detection device of claim 7, wherein, The side of the connecting frame (403) is threadedly connected with a fastening bolt (405), one end of the fastening bolt (405) penetrates into the connecting frame (403) and contacts with the connecting plate (404).

9. The battery pack thermal runaway detection device of claim 8, wherein, An installation lug (407) is installed on the protective shell (4).

10. The battery pack thermal runaway detection device of claim 9, wherein, The first protective plate (401) and the second protective plate (402) are connected with the protective shell (4) through damping hinges, lock hooks (409) are installed on the first protective plate (401) and the second protective plate (402), and two lock buckles (408) are installed on the protective shell (4).

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