Anti-deflagration device, power supply using anti-deflagration device and charging equipment using anti-deflagration device

Abstract

The invention relates to an anti-deflagration device and a power source and charging equipment using the anti-deflagration device, the power source comprises a power source shell and a battery cell arranged in the power source shell, the battery cell is provided with a safety valve, the power source further comprises the anti-deflagration device, and the anti-deflagration device comprises a fire extinguishing agent storage tank. The fire extinguishing agent storage tank is connected with the power source shell through a fire extinguishing agent supply pipeline, and a fire extinguishing agent supply valve is connected to the fire extinguishing agent supply pipeline in series. The anti-deflagration device further comprises a pumping and discharging pipeline connected with the power source shell, and a pumping and discharging pump is arranged on the pumping and discharging pipeline. The invention provides an explosion-proof combustion device capable of reducing the temperature in a battery pack and discharging high-temperature mixed gas generated by combustion of a battery cell out of the battery pack. The invention also aims to provide a power supply and charging equipment using the explosion-proof combustion device.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply safety, and particularly to an explosion-proof combustion device, a power supply and a charging device using the explosion-proof combustion device. Background Art

[0002] Common power supplies include capacitors and batteries. For electric vehicles, such as two-wheelers, three-wheelers, four-wheelers, large vehicles, etc. powered by batteries, the battery usually includes multiple battery packs. Each battery is formed by connecting multiple battery cells in series and parallel. A single battery pack can also be called a power supply. The structure of the battery pack is that multiple series-connected and parallel-connected battery cells are arranged inside the battery pack housing, and pressure relief valves are arranged on both the battery cells and the battery pack housing.

[0003] There is a risk of short circuit between the battery cells, especially during the charging process. Therefore, the battery is prone to combustion and explosion accidents. The intensity and speed of the combustion of electric vehicles are much greater than those of internal combustion vehicles, and the flames and impacts are more violent. This is called explosion and combustion in this article.

[0004] The interior of the battery cell has an oxidant and a reductant. The explosion and combustion of the battery pack is a complex and bursting physical and chemical process. As a mature power element for electric vehicles, the physical structure, electrochemistry, and heat conduction characteristics of the battery cannot be changed. During the growth process of battery combustion and explosion, a large amount of high-temperature mixed gas is generated in the initial stage. Some studies have shown that the higher the pressure of the mixed gas, the shorter the growth time of battery combustion and explosion; the higher the concentration of the mixed gas, the easier it is for the mixed gas to burn and explode; in addition, the rapid increase in the temperature inside the battery pack is also an important factor leading to the rapid entry of the battery pack into explosion and combustion. Summary of the Invention

[0005] The purpose of the present invention is to provide an explosion-proof combustion device that can reduce the temperature inside the battery pack and at the same time discharge the high-temperature mixed gas generated by the combustion of the battery cells from the battery pack; the purpose of the present invention is also to provide a power supply and a charging device using the explosion-proof combustion device.

[0006] To solve the above technical problems, the technical solution of an explosion-proof combustion device in the present invention is as follows: The explosion-proof combustion device includes a fire extinguishing agent storage tank, the fire extinguishing agent storage tank is connected to the power supply housing through a fire extinguishing agent supply pipeline, and a fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipeline; the explosion-proof combustion device further includes an exhaust pipeline connected to the power supply housing, and an exhaust pump is arranged on the exhaust pipeline.

[0007] Furthermore, the explosion-proof combustion device further includes a controller that is connected to the fire extinguishing agent supply valve and the exhaust pump for control.

[0008] Further, at least one of the following sensors is provided inside the battery cell or the battery. The sensors are temperature sensors, pressure sensors, CO sensors or fire sensors. The sensors are sampled and connected to a controller, and the controller is control-connected to a safety valve.

[0009] Further, the safety valve is a temperature-activated safety valve or a pressure-activated safety valve, and the safety valve is connected to the controller.

[0010] Further, the exhaust pipeline includes a main exhaust pipeline section located inside the power supply housing. A plurality of exhaust pipeline branch sections are connected to the main exhaust pipeline section, and the air inlet of each exhaust pipeline branch section is located beside the safety valve of the corresponding battery cell.

[0011] Further, an upper side of the safety valve is provided with a safety valve cover that is larger at the bottom and smaller at the top. The exhaust pipeline branch section is connected to the safety valve cover, and the exhaust pipeline branch section intersects the main exhaust pipeline section at an acute angle.

[0012] Further, the fire extinguishing agent supply pipeline includes a hollow annular pipeline, and the main exhaust pipeline section is arranged at the central position of the hollow annular pipeline.

[0013] Further, the exhaust pipeline is connected to one side of the power supply housing, and the fire extinguishing agent supply pipeline is connected to the other side of the power supply.

[0014] The technical solution of the power supply is as follows: A power supply includes a power supply housing and battery cells arranged inside the power supply housing. A safety valve is provided on the battery cells. The power supply further includes an explosion-proof and combustion-suppression device. The explosion-proof and combustion-suppression device includes a fire extinguishing agent storage tank. The fire extinguishing agent storage tank is connected to the power supply housing through a fire extinguishing agent supply pipeline, and a fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipeline. The explosion-proof and combustion-suppression device further includes an exhaust pipeline connected to the power supply housing, and an exhaust pump is provided on the exhaust pipeline.

[0015] Further, the explosion-proof and combustion-suppression device further includes a controller that is control-connected to the fire extinguishing agent supply valve and the exhaust pump.

[0016] Further, at least one of the following sensors is provided inside the battery cell or the battery. The sensors are temperature sensors, pressure sensors, CO sensors or fire sensors. The sensors are sampled and connected to a controller, and the controller is control-connected to a safety valve.

[0017] Further, the safety valve is a temperature-activated safety valve or a pressure-activated safety valve, and the safety valve is connected to the controller.

[0018] Further, the exhaust pipeline includes a main exhaust pipeline section located inside the power supply housing. A plurality of exhaust pipeline branch sections are connected to the main exhaust pipeline section, and the air inlet of each exhaust pipeline branch section is located beside the safety valve of the corresponding battery cell.

[0019] Further, an upper side of the safety valve is provided with a safety valve cover that is larger at the bottom and smaller at the top. A branch section of the exhaust pipe is connected to the safety valve cover, and the branch section of the exhaust pipe intersects the main section of the exhaust pipe at an acute angle.

[0020] Further, the fire extinguishing agent supply pipe includes a hollow annular pipe, and the main section of the exhaust pipe is arranged at a central position of the hollow annular pipe.

[0021] Further, the exhaust pipe is connected to one side of the power supply housing, and the fire extinguishing agent supply pipe is connected to the other side of the power supply.

[0022] The technical solution of the charging device in the present invention is as follows: A charging device includes a charging head, and a charging contact for electrically connecting to a device to be charged is provided on the charging head. The charging device further includes an explosion-proof combustion device. The explosion-proof combustion device includes a fire extinguishing agent storage tank, and the fire extinguishing agent storage tank is connected to a fire extinguishing agent supply pipe. A charging head fire extinguishing agent supply port connected to the fire extinguishing agent supply pipe is provided on the charging head, and a fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipe; the explosion-proof combustion device further includes an exhaust pipe connected to the power supply housing, and an exhaust pump is provided on the exhaust pipe. A charging head exhaust port connected to the exhaust pipe is provided on the charging head. The charging head fire extinguishing agent supply port and the charging head exhaust port are used to be connected to a device to be charged fire extinguishing agent supply port and a device to be charged exhaust port on the device to be charged respectively when the charging head charges the device to be charged.

[0023] The beneficial effects of the present invention are as follows: In the present invention, when the battery core catches fire, the exhaust pump is turned on to extract the high-temperature flue gas inside the battery core and inside the battery housing, thereby reducing the ambient temperature and the ambient gas pressure around the battery core, which helps to slow down the combustion and explosion of the battery core; at the same time, the fire extinguishing agent supply valve can also be opened to send the fire extinguishing agent into the battery housing to extinguish the open fire of the burning battery core. According to the disclosure of the fire protection, the extraction of the high-temperature mixed gas and the injection of the fire extinguishing agent can be implemented separately, alternately, or simultaneously, so as to achieve the purpose of preventing the explosion of the battery core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a schematic structural diagram of Embodiment 1 of the power supply in the present invention; Figure 2 is Figure 1 a schematic diagram of the cooperation between the power supply housing and the battery core; Figure 3 is a schematic structural diagram of Embodiment 2 of the power supply in the present invention; Figure 4 It is a schematic structural diagram of an embodiment of the charging device in the present invention; Figure 5 It is related to Figure 4 a schematic diagram of the cooperation between the charging head of the device to be charged and the power supply that mates with the charging head in Figure 6 It is Figure 5 a side view of the charging head of the device to be charged in Explanation of reference numerals: 1, fire extinguishing agent storage tank; 2, fire extinguishing agent supply pipeline; 3, exhaust pipeline; 4, exhaust pump; 5, S-shaped bend pipe; 6, filter water tank; 7, smoke exhaust pipe; 8, power supply housing installation opening; 9, power supply housing; 10, positive electrode of the battery cell; 11, negative electrode of the battery cell; 12, safety valve; 13, safety valve cover; 14, branch section of the exhaust pipeline; 15, main section of the exhaust pipeline; 16, battery cell; 17, exhaust pipeline installation opening; 18, supply pipeline installation opening; 19, charging head; 20, charging head fire extinguishing agent supply port; 21, charging head exhaust port; 22, charging head of the device to be charged; 23, fire extinguishing agent supply port of the device to be charged; 24, exhaust port of the device to be charged; 25, pipeline. Detailed implementation manners

[0025] For the convenience of understanding the present invention, the present invention will be described in more detail below in conjunction with the drawings and specific embodiments. The drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0026] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0027] Embodiment 1 of a power supply in the present invention is as Figures 1-2 shown: The power supply in the present invention is a battery (or capacitor). When in use, the battery is arranged on an electric vehicle, a charging station or other environments that require electricity. The power supply includes a power supply housing 9 and four battery cells 16 arranged inside the power supply housing 9. The four battery cells are connected in series (or in parallel). Each battery cell has a positive electrode 10 and a negative electrode 11 at its upper end. A safety valve 12 is arranged between the positive electrode and the negative electrode at the upper end of the battery cell. When in use, the power supply can be used alone, or the power supply can be used as a power supply unit, and multiple power supplies are connected in series or in parallel for common use.

[0028] The power supply further includes an explosion-proof and conflagration-suppression device. The explosion-proof and conflagration-suppression device includes a fire extinguishing agent storage tank 1 located outside the battery. The fire extinguishing agent storage tank 1 stores a coolant or a fire extinguishing agent. The fire extinguishing agent storage tank 1 has a certain pressure. The fire extinguishing agent storage tank is connected to the power supply housing 9 through a fire extinguishing agent supply pipeline 2. A fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipeline 2. The explosion-proof and conflagration-suppression device further includes an exhaust pipeline 3 connected to the power supply housing. A exhaust pump 4 is provided on the exhaust pipeline 3. The exhaust pump 4 is located outside the power supply housing. The air outlet of the exhaust pump is connected to an S-shaped bent pipe 5. The air outlet of the S-shaped bent pipe extends into a filter water tank 6. The gas extracted from the power supply housing passes through the S-shaped bent pipe and the filter water tank and is then discharged through an exhaust pipe 7. The S-shaped bent pipe 5 is used for heat dissipation and weakening open flames. The filter water tank 6 can completely extinguish open flames and at the same time precipitate solid particle impurities in a large amount of flue gas.

[0029] A power supply housing installation opening 8 is provided on the front side of the power supply housing. The exhaust pipeline and the fire extinguishing agent supply pipeline extend into the interior of the power supply housing through the same power supply housing installation opening 8. Specifically, the fire extinguishing agent supply pipeline 2 includes a hollow annular pipeline. The exhaust pipeline includes an exhaust pipeline main section 15 located inside the power supply housing. The exhaust pipeline main section 15 is arranged at the central position of the hollow annular pipeline. This helps to reduce the temperature of the flue gas when the flue gas is discharged through the exhaust pipeline and reduce the impact on the surrounding environment. A plurality of exhaust pipeline branch sections 14 respectively corresponding to each battery cell are connected to the exhaust pipeline main section. The air inlet of each exhaust pipeline branch section is located beside the safety valve 12 of the corresponding battery cell.

[0030] Specifically, an upper-large and lower-small safety valve cover 13 is provided above the safety valve 12. The exhaust pipeline branch section 14 is connected to the safety valve cover 13. The exhaust pipeline branch section intersects the exhaust pipeline main section at an acute angle. In this embodiment, each exhaust pipeline branch section extends obliquely forward from left to right. In this way, when each exhaust pipeline branch section works to suck the corresponding safety valve, the flame at one safety valve will not spread to other battery cells, avoiding the spread of fire to other safety valves and preventing the battery cells that have not caught fire from being ignited by the adjacent battery cells that have caught fire. The discharge outlet of the fire extinguishing agent supply pipeline 2 communicates with the rear side of the inner cavity of the power supply housing.

[0031] The explosion-proof and conflagration-suppression device further includes a controller that is controllably connected to the fire extinguishing agent supply valve and the exhaust pump.

[0032] At least one of the following sensors is provided inside the battery cell (or battery), and the sensor is a temperature sensor, a pressure sensor, a CO sensor or a fire sensor. The sensor is connected to the controller for sampling, and the controller is connected to the safety valve for control. The sensor is used to determine whether a fire occurs inside the corresponding battery cell or battery. For example, when a fire occurs inside a certain battery cell, the controller controls the safety valve at the upper end of the corresponding battery cell to open, and the high-temperature gas inside the battery cell is discharged through the safety valve. The high-temperature gas at the safety valve is evacuated through the evacuation pipeline.

[0033] In other embodiments of the present invention, the sensor may not be provided. At this time, the safety valve on the battery cell may be a temperature-activated safety valve or a pressure-activated safety valve, and the safety valve is connected for control. A temperature-activated safety valve means that when the temperature inside the battery cell reaches the set temperature, the safety valve opens. When the safety valve opens, the safety valve transmits a signal to the controller, and the controller controls the fire extinguishing agent supply valve and the evacuation pump to work; similarly, a pressure-activated safety valve means that when the pressure inside the battery cell reaches the set pressure, the safety valve opens. When the safety valve opens, the safety valve transmits a signal to the controller, and the controller controls the fire extinguishing agent supply valve and the evacuation pump to work.

[0034] When the present invention is working, when a short circuit and combustion occur inside a certain battery cell, the controller controls the safety valve at the corresponding battery cell to open, and evacuates through the evacuation pipeline to the corresponding safety valve, quickly discharging the high-temperature gas generated inside the corresponding battery cell. At the same time, during the evacuation process, it is avoided that the adjacent problem-free battery cells are ignited; sensors are also provided on the inner side of the battery housing. If the fire of the battery cell cannot be extinguished by single evacuation, the controller controls the fire extinguishing agent supply valve to open, and the fire extinguishing agent is discharged into the power supply housing through the fire extinguishing agent supply pipeline, so as to achieve full coverage of the battery cell, realize temperature reduction and air isolation, and thus quickly extinguish the fire of the battery cell. A pressure relief valve is provided on the power supply housing to avoid explosion accidents of the power supply housing.

[0035] In other embodiments of the present invention, the controller may not be provided. At this time, a manual control switch for the fire extinguishing agent supply valve and the evacuation pump can be provided. When the staff discovers that the battery cell or the power supply housing catches fire, the fire extinguishing agent supply valve and the evacuation pump are opened by manually operating the manual control switch to avoid deflagration of the power supply housing.

[0036] An embodiment 2 of a power supply is as Figure 3As shown in the figure: The difference between Example 2 and Example 1 is that the solution in this example is more suitable for the transformation of existing power supplies. For existing power supplies, it is not very easy to set up relatively complex fire extinguishing agent supply pipelines and exhaust pipelines inside the battery housing as in Example 1. In this example, an exhaust pipeline installation port 17 is set on the front side of the power supply housing, and a supply pipeline installation port 18 is set on the rear side of the power supply housing. After a heat exchange section between the exhaust pipeline and the fire extinguishing agent supply pipeline, the exhaust pipeline 3 is connected to the front end of the inner cavity of the power supply housing through the exhaust pipeline installation port 17, and the fire extinguishing agent supply pipeline 2 is connected to the rear end of the inner cavity of the power supply housing 9 through the supply pipeline installation port 18. When working in this way, the exhaust pipeline sucks from the front end of the inner cavity of the power supply housing, and the fire extinguishing agent supply pipeline supplies the fire extinguishing agent to the rear end of the inner cavity of the power supply housing. Under the action of the pressure difference, the fire extinguishing agent can quickly fill the entire inner cavity of the power supply housing.

[0037] Examples of charging devices are as Figure 4 shown: In Example 1, the explosion-proof and flame-retardant device is installed together with the power supply housing. For example, the explosion-proof and flame-retardant device and the power supply housing are installed on a movable vehicle at the same time. Considering the energy consumption problem of electric vehicles and the transformation difficulty of some electric vehicles, for example, there is basically no transformation space on two-wheeled electric vehicles, or there is also a lack of corresponding transformation space on four-wheeled electric vehicles. Also, considering that most explosion and combustion accidents occur during the charging process, in this example, the explosion-proof and flame-retardant device is not set together with the power supply housing, but the explosion-proof and flame-retardant device is set together with the charging head 19. The explosion-proof and flame-retardant device belongs to a fixed explosion-proof and flame-retardant device, and the charging head 19 is a charging plug (or charging socket). The component charged by using this charging head during use is called the device to be charged. There is a power supply on the device to be charged, and the power supply includes a power supply housing and a battery cell arranged in the power supply housing. The device to be charged has a charging head 22 (charging socket) of the device to be charged, and a fire extinguishing agent supply port 23 and an exhaust port 24 of the device to be charged that are communicated with the inner cavity of the power supply housing 9 through their respective pipelines 25 are arranged on the charging head of the device to be charged.

[0038] The explosion-proof and flame-retardant device includes a fire extinguishing agent storage tank 1. The fire extinguishing agent storage tank 1 stores a coolant or a fire extinguishing agent. The fire extinguishing agent storage tank has a certain pressure. A fire extinguishing agent supply pipeline 2 is connected to the fire extinguishing agent storage tank, and a fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipeline 2. The explosion-proof and flame-retardant device also includes an exhaust pipeline 3. A suction pump is arranged on the exhaust pipeline 3. The air outlet of the suction pump is connected to an S-shaped bent pipe 5. The air outlet of the S-shaped bent pipe extends into a filter water tank 6, and the gas extracted from the power supply housing is discharged after passing through the S-shaped bent pipe 5 and the filter water tank 6. The S-shaped bent pipe is used for heat dissipation and weakening open flames, and the filter water tank can completely extinguish open flames and at the same time precipitate solid particle impurities in a large amount of smoke.

[0039] The charging head is provided with a charging head fire extinguishing agent supply port 20 connected to the fire extinguishing agent supply pipeline, and the charging head is provided with a charging head exhaust port 21 connected to the exhaust pipeline. The charging head fire extinguishing agent supply port and the charging head exhaust port are used to be inserted and connected to the fire extinguishing agent supply port and the exhaust port of the device to be charged on the device to be charged respectively when the charging head charges the device to be charged.

[0040] That is to say, when the device to be charged is charged, the charging head in this embodiment is inserted and connected to the charging head of the device to be charged on the device to be charged, so as to supply power to the device to be charged through the charging contact. At the same time, the charging head fire extinguishing agent supply port is connected to the fire extinguishing agent supply port of the device to be charged, and the charging head exhaust port is connected to the exhaust port of the device to be charged. At this time, the fire extinguishing agent supply pipeline of the explosion-proof combustion device is connected to the power supply housing on the device to be charged through the charging head fire extinguishing agent supply port and the fire extinguishing agent supply port of the device to be charged; the exhaust pipeline of the explosion-proof combustion device is connected to the power supply housing through the charging head exhaust port and the exhaust port of the device to be charged. When a short circuit occurs and catches fire during the charging process, the explosion-proof combustion device can perform the operations of exhausting air and introducing fire extinguishing agent from the charging head to the power supply housing of the device to be charged.

[0041] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, with regard to the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components or the interaction relationship between two components. Therefore, unless otherwise clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0042] According to the above description of this specification, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or component involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms indicating orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0043] In addition, the terms "first" or "second" and other terms used to refer to numbers or ordinals in this specification are for descriptive purposes only, and should not be construed as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power supply, comprising a power supply housing and an electric core disposed inside the power supply housing, characterized in that: A safety valve is provided on the battery cell, and the power supply further includes an explosion and conflagration prevention device. The explosion and conflagration prevention device includes a fire extinguishing agent storage tank, which is connected to the power supply housing through a fire extinguishing agent supply pipeline. A fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipeline. The explosion and conflagration prevention device further includes an exhaust pipeline connected to the power supply housing, and an exhaust pump is provided on the exhaust pipeline.

2. The power supply according to claim 1, wherein: The explosion and conflagration prevention device further includes a controller that is connected to the fire extinguishing agent supply valve and the exhaust pump for control.

3. The power supply according to claim 2, wherein: At least one of the following sensors is provided inside the battery cell or the battery. The sensors are temperature sensors, pressure sensors, CO sensors or fire sensors. The sensors are connected to the controller for sampling, and the controller is connected to the safety valve for control.

4. The power supply according to claim 2, characterized in that: The safety valve is a temperature-activated safety valve or a pressure-activated safety valve, and the safety valve is connected to the controller.

5. The power supply according to any one of claims 1 to 4, characterized in that: The exhaust pipeline includes an exhaust pipeline main section located inside the power supply housing. A plurality of exhaust pipeline branch sections are connected to the exhaust pipeline main section. The air inlet of each exhaust pipeline branch section is located beside the safety valve of the corresponding battery cell.

6. The power supply according to claim 5, characterized in that: An upper large and lower small safety valve cover is provided on the upper side of the safety valve. The exhaust pipeline branch section is connected to the safety valve cover, and the exhaust pipeline branch section intersects the exhaust pipeline main section at an acute angle.

7. The power supply according to claim 5, characterized in that: The fire extinguishing agent supply pipeline includes a hollow annular pipeline, and the exhaust pipeline main section is arranged at the central position of the hollow annular pipeline.

8. The power supply according to any one of claims 1 to 4, characterized in that: The exhaust pipeline is connected to one side of the power supply housing, and the fire extinguishing agent supply pipeline is connected to the other side of the power supply.

9. Flameproof explosion device, characterized in that: The explosion and conflagration prevention device in the power supply according to any one of claims 1 to 8.

10. Charging device, including a charging head, wherein a charging contact for electrically connecting with a device to be charged is provided on the charging head, characterized in that: The charging device further includes an explosion and conflagration prevention device. The explosion and conflagration prevention device includes a fire extinguishing agent storage tank, and the fire extinguishing agent storage tank is connected with a fire extinguishing agent supply pipeline. A charging head fire extinguishing agent supply port connected to the fire extinguishing agent supply pipeline is provided on the charging head. A fire extinguishing agent supply valve is connected in series on the fire extinguishing agent supply pipeline. The explosion and conflagration prevention device further includes an exhaust pipeline connected to the power supply housing, and an exhaust pump is provided on the exhaust pipeline. A charging head exhaust port connected to the exhaust pipeline is provided on the charging head. The charging head fire extinguishing agent supply port and the charging head exhaust port are used to be connected to the fire extinguishing agent supply port and the exhaust port of the device to be charged on the device to be charged respectively when the charging head charges the device to be charged.

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