Drainage device, sensor, battery pack and energy storage equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a drainage device, a sensor, a battery pack and energy storage equipment, the drainage device comprises a first shell, a reactant and an induced reaction assembly, a first cavity is formed in the first shell, and the side wall of the first cavity is provided with a first weak part and a second weak part; the reactant is filled in the first cavity; the induction reaction assembly is arranged in the first cavity and can detonate reactants to enable the first weak part and the second weak part to be broken to form a first flow guide opening and a second flow guide opening correspondingly, and the first flow guide opening, the first cavity and the second flow guide opening are sequentially communicated to form a flow guide channel. The drainage device can automatically detonate reactants under specific conditions, so that the first weak part and the second weak part are broken to form the first flow guide opening and the second flow guide opening correspondingly, and therefore cooling liquid in the cooling pipeline sequentially flows through the first flow guide opening, the first cavity and the second flow guide opening and is finally introduced into the battery pack for fire extinguishing; and fire can be effectively extinguished after thermal runaway of the battery pack occurs.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a drainage device, a sensor, a battery pack, and an energy storage device. Background Art

[0002] With the expansion of China's new energy market, electric vehicles have become more and more popular among our users. After long-term use, thermal runaway has occurred in more and more electric vehicles. After the battery pack undergoes thermal runaway, most electric vehicles cannot effectively extinguish the fire. Utility Model Content

[0003] This application provides a drainage device, a sensor, a battery pack, and an energy storage device to solve the problem that effective fire extinguishing cannot be achieved after the battery pack undergoes thermal runaway in the prior art.

[0004] On the one hand, this application provides a drainage device, including:

[0005] A first housing, a first cavity is formed inside the first housing, and the side wall of the first cavity has a first weak part and a second weak part;

[0006] A reactant, filled in the first cavity;

[0007] An induced reaction component, arranged in the first cavity, capable of detonating the reactant to rupture the first weak part and the second weak part to respectively form a first diversion port and a second diversion port, and the first diversion port, the first cavity, and the second diversion port are sequentially connected to form a diversion channel.

[0008] In a possible design, the thicknesses of the first weak part and the second weak part are less than the thickness of the side wall of the first cavity.

[0009] In a possible design, the induced reaction component includes an electric heating wire; and / or, the reactant includes gunpowder.

[0010] In a possible design, the first housing includes a housing body and an end cover, and the housing body is detachably connected to the end cover.

[0011] In a possible design, a wire passing hole is provided on the end cover.

[0012] In a possible design, a connection structure is arranged on the outer side wall of the first housing, and the connection structure connects the first housing to a fluid pipeline so that the first weak part is located inside the fluid pipeline and the second weak part is located outside the fluid pipeline.

[0013] On the other hand, this application also provides a sensor, including the drainage device as described above, and further including:

[0014] A second housing, the second housing is detachably connected to the first housing, and a second cavity is formed inside the second housing;

[0015] The thermistor is disposed in the second cavity.

[0016] In a possible design, both the first housing and the second housing are metal housings.

[0017] On the other hand, the present application also provides a battery pack including the sensor as described above.

[0018] On yet another aspect, the present application also provides an energy storage device including the battery pack as described above.

[0019] The beneficial effects of the present application are as follows:

[0020] The drainage device of the present application is used to introduce the coolant in the cooling pipe into the battery pack for fire extinguishing under specific conditions (such as when the battery pack undergoes thermal runaway). The drainage device of the present application forms a first weak part and a second weak part on the side wall of the first cavity, and arranges reactants and an induced reaction assembly in the first cavity. Under specific conditions, the induced reaction assembly can automatically detonate the reactants, causing the first weak part and the second weak part to rupture respectively to form a first diversion port and a second diversion port. The first diversion port, the first cavity, and the second diversion port are sequentially connected to form a diversion channel, so that the coolant in the cooling pipe sequentially flows through the first diversion port, the first cavity, and the second diversion port and is finally introduced into the battery pack for fire extinguishing, ensuring effective fire extinguishing after the battery pack undergoes thermal runaway.

[0021] Since the sensor provided by the present application includes the drainage device of the present application, it simultaneously includes all the above advantages of the drainage device.

[0022] Since the battery pack provided by the present application includes the sensor of the present application, it simultaneously includes all the above advantages of the sensor.

[0023] Since the energy storage device provided by the present application includes the battery pack of the present application, it simultaneously includes all the above advantages of the battery pack. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Schematic structural diagram of the drainage device provided by an embodiment of the present application;

[0026] Figure 2Cross-sectional view of the drainage device provided by an embodiment of the present application;

[0027] Figure 3 Schematic structural diagram of the sensor provided by an embodiment of the present application;

[0028] Figure 4 Cross-sectional view of the sensor provided by an embodiment of the present application;

[0029] Figure 5 Exploded view of the structure of the sensor provided by an embodiment of the present application;

[0030] Figure 6 Schematic structural diagram of the sensor in a normal state provided by an embodiment of the present application;

[0031] Figure 7 Schematic structural diagram of the sensor in a thermal runaway state provided by an embodiment of the present application.

[0032] Reference numerals:

[0033] 100, first housing; 110, first cavity; 120, first weak part; 130, second weak part; 140, first diversion port; 150, second diversion port; 160, housing body; 170, end cover; 171, wire passing hole; 200, reactant; 300, reaction induction component; 400, second housing; 410, second cavity; 500, thermistor; 600, battery management system; 610, first pin; 620, second pin; 630, third pin; 700, cooling pipe; 800, coolant. Detailed implementation manners

[0034] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0035] The following combines Figures 1-7 , to describe the drainage device provided in the embodiments of the present application. The drainage device is used to actively introduce fluid from one space into another space under specific conditions. For example, the drainage device is applied to the drainage design of the coolant 800 of the battery pack. When a thermal runaway occurs in the battery pack, the drainage device can introduce the coolant 800 in the cooling pipe 700 into the battery pack for active and rapid fire extinguishing.

[0036] Specifically, the drainage device includes a first housing 100, a reactant 200, and an induced reaction component 300. A first cavity 110 is formed inside the first housing 100, and the side wall of the first cavity 110 has a first weak portion 120 and a second weak portion 130; the reactant 200 is filled in the first cavity 110; the induced reaction component 300 is disposed in the first cavity 110 and can cause the first weak portion 120 and the second weak portion 130 to rupture to respectively form a first diversion port 140 and a second diversion port 150 by detonating the reactant 200. The first diversion port 140, the first cavity 110, and the second diversion port 150 are sequentially connected to form a diversion channel. Specifically, the reactant 200 is an explosive substance. When it receives an appropriate excitation impulse (such as mechanical impact or thermal action) from the induced reaction component 300, it can produce a rapid chemical reaction, release sufficient heat and a large amount of gas products, thereby forming a certain mechanical destruction effect.

[0037] It should be noted that under normal conditions, the induced reaction component 300 will not detonate the reactant 200; when the battery pack undergoes thermal runaway, under the influence of factors such as current or temperature, the induced reaction component 300 will detonate the reactant 200. When the reactant 200 explodes, the first weak portion 120 and the second weak portion 130 will rupture. It should be noted that the strength of the first weak portion 120 and the second weak portion 130 is lower than that of other parts of the housing, so that the reactant 200 can blow open the first weak portion 120 and the second weak portion 130. In some specific embodiments, the number of the first cavities 110 is at least one, the number of the first weak portions 120 is at least one, and the number of the second weak portions 130 is at least one. By increasing the number of the first cavities 110, the first weak portions 120, and the second weak portions 130, the flow rate of the diversion channel formed after the induced reaction component 300 detonates the reactant 200 can be increased, and the fire extinguishing efficiency can be improved.

[0038] Using the technical solution in the above embodiment, by providing the first weak portion 120 and the second weak portion 130 on the side wall of the first cavity 110, and arranging the reactant 200 and the induced reaction component 300 in the first cavity 110, under specific conditions (such as when the battery pack undergoes thermal runaway), the induced reaction component 300 can automatically detonate the reactant 200, causing the first weak portion 120 and the second weak portion 130 to rupture to respectively form the first diversion port 140 and the second diversion port 150. The first diversion port 140, the first cavity 110, and the second diversion port 150 are sequentially connected to form a diversion channel, so that the coolant 800 in the cooling pipe 700 flows through the first diversion port 140, the first cavity 110, and the second diversion port 150 in sequence and is finally introduced into the battery pack for fire extinguishing, ensuring effective fire extinguishing after the battery pack undergoes thermal runaway.

[0039] Refer to Figure 1 、Figure 2 As shown, in some embodiments of the present application, the thicknesses of the first weak part 120 and the second weak part 130 are less than the thickness of the side wall of the first cavity 110. By reducing the thicknesses of the first weak part 120 and the second weak part 130, the structural strengths of the first weak part 120 and the second weak part 130 can be weakened, so that the first weak part 120 and the second weak part 130 can be exploded by the blasting force when the reactant 200 explodes. In other embodiments, the strength of the first weak part 120 and the second weak part 130 can also be weakened by arranging a weak zone, which are all within the protection scope of the present application.

[0040] Referring to Figure 1 、 Figure 2 As shown, in some embodiments of the present application, the induced reaction component 300 includes an electric heating wire, and the reactant 200 includes gunpowder. In some specific embodiments, the electric heating wire is a tin-lead alloy, the resistance value of the electric heating wire is between 1.7Ω and 2.5Ω, and the electric heating wire will melt and generate a spark to detonate the gunpowder after the current passing through it is greater than 1.75A and lasts for 0.5ms. In some specific embodiments, one end of the electric heating wire is electrically connected to the first pin 610 of the battery management system 600, and the other end of the electric heating wire is electrically connected to the third pin 630 of the battery management system 600. When the battery management system 600 detects a thermal runaway of the battery pack, a 5V voltage will be output between the first pin 610 and the third pin 630, so that the electric heating wire melts and generates a spark to detonate the gunpowder. With such a setting, the induced reaction component 300 can actively detonate the reactant 200 in time when the battery pack has a thermal runaway, so that the coolant 800 flows out to achieve effective fire extinguishing.

[0041] Referring to Figure 1 、 Figure 2 As shown, in some embodiments of the present application, the first housing 100 includes a housing body 160 and an end cover 170, and the housing body 160 is detachably connected to the end cover 170. In some specific embodiments, the housing body 160 is cylindrical, and the housing body 160 and the end cover 170 are connected by threads or snap connection. By making the end cover 170 detachably connected to the housing body 160, it is convenient to place the reactant 200 and the induced reaction component 300 into the first cavity 110.

[0042] Referring to Figure 1 、 Figure 2 As shown, in some embodiments of the present application, a wire passing hole 171 is provided on the end cover 170. Specifically, when the induced reaction component 300 is an electric heating wire, both ends of the electric heating wire are electrically connected to the first pin 610 and the third pin 630 of the battery management system 600 through wires. By providing the wire passing hole 171 on the end cover 170, it is convenient for the wires to pass through the wire passing hole 171.

[0043] Referring toFigure 1 , Figure 2 , Figure 6 , Figure 7 As shown in Figure 7 , in some embodiments of the present application, a connection structure is provided on the outer side wall of the first housing 100. The connection structure connects the first housing 100 to the fluid pipeline, so that the first weak part 120 is located inside the fluid pipeline, and the second weak part 130 is located outside the fluid pipeline. In some specific embodiments, the connection structure can be an external thread. A through hole is provided on the side wall of the fluid pipeline, and an internal thread is provided on the inner wall of the through hole. The first housing 100 is threadedly connected to the fluid pipeline; in other specific embodiments, the connection structure can also be a groove or a protrusion, and the first housing 100 and the fluid pipeline are clamped to each other through the concave-convex structure. In some specific embodiments, the first housing 100 is a cylindrical structure. The first weak part 120 is arranged near the lower end of the first housing 100, and the second weak part 130 is arranged near the upper end of the first housing 100. The middle part of the first housing 100 is connected to the fluid pipeline, so that the first weak part 120 is located inside the fluid pipeline and the second weak part 130 is located outside the fluid pipeline. After the reactant 200 is detonated, the coolant 800 in the fluid pipeline can flow out through the first diversion port 140, the first cavity 110, and the second diversion port 150 in sequence.

[0044] Referring to Figure 3 , Figure 4 , Figure 5 As shown in Figure 5 , an embodiment of the present application further provides a sensor, including the drainage device in the above embodiment. The sensor further includes a second housing 400 and a thermistor 500. The second housing 400 is detachably connected to the first housing 100, and a second cavity 410 is formed inside the second housing 400; the thermistor 500 is arranged in the second cavity 410. In some specific embodiments, an external thread is provided at the upper end of the second housing 400, and an internal thread is provided at the lower end of the first housing 100. The second housing 400 is threadedly connected to the first housing 100, so that it is convenient to place the thermistor 500 into the second cavity 410. In some specific embodiments, one end of the thermistor 500 is electrically connected to the second pin 620 of the battery management system 600, and the other end of the thermistor 500 is electrically connected to the third pin 630 of the battery management system 600. The third pin 630 is grounded. In the working state, the battery management system 600 monitors the temperature of the coolant 800 in the cooling pipeline 700 through the thermistor 500.

[0045] In some specific embodiments, both the first housing 100 and the second housing 400 are metal housings, and the metal housings have good thermal conductivity. For example, both the first housing 100 and the second housing 400 are made of metal copper, so as to facilitate the thermistor 500 to detect the ambient temperature outside the first housing 100 and the second housing 400.

[0046] Working principle of the sensor of the present application:

[0047] Referring to Figure 6 As shown, when the battery pack is in normal working condition, the battery management system 600 monitors the temperature of the coolant 800 in the cooling pipe 700 through the thermistor 500; there is no current in the induced reaction component 300, and both the induced reaction component 300 and the reactant 200 are arranged in the first cavity 110, and the first weak part 120 and the second weak part 130 jointly seal the first cavity 110;

[0048] Referring to Figure 7 As shown, when the battery pack undergoes thermal runaway, the battery management system 600 will output a 5V voltage between the first pin 610 and the third pin 630, so that the induced reaction component 300 melts to generate a spark and then detonates the reactant 200. When the reactant 200 explodes, the first weak part 120 and the second weak part 130 are blasted open. A first diversion port 140 is formed at the position of the first weak part 120, and a second diversion port 150 is formed at the position of the second weak part 130. The first diversion port 140, the first cavity 110, and the second diversion port 150 are sequentially connected to form a diversion channel, so that the coolant 800 in the cooling pipe 700 flows through the first diversion port 140, the first cavity 110, and the second diversion port 150 in sequence and is finally introduced into the battery pack for fire extinguishing.

[0049] An embodiment of the present application further provides a battery pack, including the sensor in the above embodiment.

[0050] It should be noted that since the battery pack includes the sensor, it also includes all the above advantages of the sensor, which will not be elaborated here.

[0051] An embodiment of the present application further provides an energy storage device, including the battery pack in the above embodiment. Specifically, the energy storage device can be a vehicle, a working machine, etc.

[0052] It should be noted that since the energy storage device includes the battery pack, it also includes all the above advantages of the battery pack, which will not be elaborated here.

[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 should not be construed as a limitation to the present application.

[0054] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0055] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In this application, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A drainage device, characterized in that: include: A first shell, wherein a first cavity is formed inside the first shell, and a side wall of the first cavity has a first weak portion and a second weak portion; Reactants are filled in the first cavity; The induced reaction component is arranged in the first cavity, and can form a first guide port and a second guide port respectively by detonating the reactant to rupture the first weak portion and the second weak portion. The first guide port, the first cavity, and the second guide port are connected in sequence to form a guide channel.

2. The drainage device according to claim 1, characterized in that: The thickness of the first weak portion and the second weak portion is smaller than the thickness of the side wall of the first cavity.

3. The drainage device according to claim 1, characterized in that: The reaction-inducing component includes a heating wire; and / or the reactant includes gunpowder.

4. The drainage device according to claim 1, characterized in that: The first shell includes a shell body and an end cover, and the shell body is detachably connected to the end cover.

5. The drainage device according to claim 4, characterized in that: The end cover is provided with a wire passing hole.

6. The drainage device according to claim 1, characterized in that: The outer side wall of the first shell is provided with a connection structure, and the connection structure connects the first shell and the fluid pipeline so that the first weak portion is located inside the fluid pipeline and the second weak portion is located outside the fluid pipeline.

7. A sensor, characterized in that: The drainage device according to any one of claims 1 to 6 further comprises: a second shell, the second shell being detachably connected to the first shell, and a second cavity being formed inside the second shell; Thermistor is disposed in the second cavity.

8. The sensor according to claim 7, characterized in that: The first shell and the second shell are both metal shells.

9. A battery pack, characterized in that: The sensor comprises the sensor according to any one of claims 7 to 8.

10. An energy storage device, characterized in that: A battery pack comprising the battery pack of claim 9.

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