Double-sensing type fire extinguishing mechanism for battery charging and protection assembly with fire extinguishing mechanism

Abstract

The utility model relates to the field of lithium batteries, in particular to a double-induction type fire extinguishing mechanism for battery charging and a protection assembly with the fire extinguishing mechanism, the double-induction type fire extinguishing mechanism comprises a protection shell, and a protection medium is arranged on one side, far away from a rechargeable battery, of the protection shell; a water outlet is formed in the protective shell; the water outlet is connected with an air bag water drain valve; the air bag water drain valve can be damaged under the action of the rechargeable battery to leak out the protective medium; according to the fire extinguishing mechanism disclosed by the utility model, the rechargeable battery can act on the fire extinguishing mechanism under the condition of expansion or / and thermal runaway during charging of the battery, so that the air bag water drain valve is broken and opened; a protective medium isolated by the protective shell in the fire extinguishing mechanism flows to the rechargeable battery; and when the rechargeable battery is on fire, the protective medium can be used for carrying out fire extinguishing operation on the rechargeable battery.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to a double-sensing fire extinguishing mechanism for battery charging and a protection assembly with the fire extinguishing mechanism. Background Art

[0002] Lithium-ion batteries have become an indispensable energy storage device in our lives.

[0003] The specifications and energy storage capacity of lithium-ion batteries vary greatly: common electrical appliances such as mobile phones and laptops use small batteries (generally storing less than 100Wh), electric vehicles use large battery packs (storing tens to hundreds of kWh), and medium-sized batteries (100Wh to 15,000Wh) are widely used in electric bicycle batteries, electric wheelchair batteries, drone batteries, and portable outdoor mobile power supplies.

[0004] The current application of medium-sized lithium-ion batteries, especially in electric bicycles, is huge. my country has nearly 400 million electric bicycles, and in recent years, the annual sales of new vehicles are 50-60 million.

[0005] However, the safety issues of combustion and explosion have received widespread attention.

[0006] The main factors causing combustion and explosion accidents caused by thermal runaway of lithium-ion batteries are: internal short circuit hazards inside the battery and abuse of the battery by users.

[0007] The internal hidden dangers of batteries include two categories: internal hidden dangers of battery cells and internal hidden dangers of battery pack structure design and manufacturing.

[0008] The internal hidden dangers of battery cells are mainly internal short circuits between positive and negative sheets. For example, during charging, lithium dendrites are formed at the bare leakage points of the copper foil formed by shrinkage holes in the graphite coating of the negative copper foil, metal burrs or magnetic impurities and foreign objects penetrate the diaphragm, and the alignment defects between the positive and negative sheets and the diaphragm or insufficient diaphragm coating margin lead to direct short circuits between the positive and negative electrodes. The internal short circuit causes local overheating of the battery and induces thermal runaway.

[0009] The internal hidden dangers in the structural design and manufacturing of battery packs are mainly poor soldering of battery cell series and parallel chain welding connectors, poor thermal management design, electrical circuit short circuit accidents, etc., which lead to local overheating and thermal runaway.

[0010] The main abuse of batteries by users is the misuse of high-voltage chargers that damage the battery management system, the unauthorized modification and disassembly of battery packs, and water seepage inside the battery pack, which leads to overcharging and over-discharging of the battery.

[0011] Among them, 80% of the battery fire accidents currently reported in the electric two-wheeled vehicle industry occurred during the charging process, which actually includes two factors: internal short circuit of the battery cell and overcharging of the battery pack.

[0012] Different technical routes of lithium-ion batteries have very different consequences in the event of thermal runaway.

[0013] Although rigid-shell batteries (square aluminum shells and cylindrical batteries) are designed with pressure relief valves to prevent explosions in extreme situations, explosions still occur from time to time and the consequences are extremely serious.

[0014] When thermal runaway occurs in a ternary battery whose positive electrode is a nickel-cobalt-manganese composite oxide, a large amount of free oxygen is generated inside the battery to assist combustion, so the fire is more intense and the combustion spreads faster.

[0015] Even if lithium-ion batteries do not explode, the flames produced after combustion can easily cause secondary fires.

[0016] If thermal runaway of a lithium battery occurs, the battery cells swell, rupture, or even explode, and the hydrocarbons, carbon oxides, and even hydrogen produced by the combustion of the organic electrolyte quickly accumulate in a confined space, especially during sleep at night, which is the second risk factor that threatens the user's life safety.

[0017] The existing patent CN201721095612 - Lead-acid battery charging protection device for electric vehicles, is to protect the charger rather than the battery.

[0018] Therefore, in order to improve or solve at least one of the above technical problems, a protective device with low cost and capable of effectively ensuring the safety of indoor charging of lithium-ion batteries is now needed. Utility Model Content

[0019] The utility model aims to provide a fire extinguishing mechanism which can effectively realize charging protection in a battery room based on battery charging expansion and / or battery thermal runaway.

[0020] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0021] A dual-sensing fire extinguishing mechanism for battery charging, comprising a protective shell, wherein a protective medium is provided on a side of the protective shell away from the rechargeable battery;

[0022] The protective shell is provided with a drain port; the drain port is connected to an airbag drain valve; the airbag drain valve can be damaged and leak protective medium after being acted upon by a rechargeable battery.

[0023] The air bag drain valve comprises an induction air bag body for blocking the drain port.

[0024] The induction airbag body is a hot-melt airbag.

[0025] The airbag drain valve also includes an airbag fixing shell arranged on the protective shell, and the interior of the airbag fixing shell is hollow to form a placement cavity; the airbag fixing shell is provided with a connecting through hole; the drain port is connected to the side of the protective shell away from the rechargeable battery through the connecting through hole; the induction airbag body is connected to the protective shell through the airbag fixing shell.

[0026] A sealing ring is arranged on the inner side wall of the air bag fixing shell.

[0027] The air bag drain valve is arranged inside the protective shell.

[0028] The water discharge port is a square, circular or irregular hole.

[0029] A protection assembly for battery charging includes a bag breaking mechanism and the dual-sensing fire extinguishing mechanism; each dual-sensing fire extinguishing mechanism corresponds to a bag breaking mechanism; the bag breaking mechanism includes a bag breaking device arranged on a rechargeable battery.

[0030] The capsule breaker is cone-shaped.

[0031] The protection assembly also includes a protection container, the dual-sensing fire extinguishing mechanism is connected to the protection container, and the battery to be charged is arranged in the protection container.

[0032] The advantages of the utility model are:

[0033] The utility model discloses a double-sensing fire extinguishing mechanism for battery charging and a protection assembly with the fire extinguishing mechanism.

[0034] The fire extinguishing mechanism disclosed by the utility model can, when the battery expands and / or thermal runaway occurs during charging, the rechargeable battery acts on the fire extinguishing mechanism, thereby causing the airbag drain valve to break and open; then the protective medium isolated by the protective shell in the fire extinguishing mechanism flows toward the rechargeable battery; thereby realizing the cooling operation of the rechargeable battery. When the rechargeable battery catches fire, the protective medium can be used to extinguish the fire of the rechargeable battery.

[0035] At the same time, with the use of a bag-breaking mechanism and a protective container, the protection of the rechargeable battery during charging can be better achieved; and the protective container can achieve isolation and protection of the rechargeable battery during indoor charging, avoiding economic losses caused by battery combustion during indoor charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following is a brief description of the contents expressed in each of the drawings of the utility model specification and the marks in the drawings:

[0037] Figure 1 It is a structural schematic diagram of the fire extinguishing mechanism in the utility model.

[0038] Figure 2 It is a structural schematic diagram of the fire extinguishing mechanism of the utility model when arranged in a protective container.

[0039] The marks in the above figure are:

[0040] 1. Fire extinguishing mechanism, 11. Protective shell, 12. Protective medium, 13. Airbag drain valve, 131. Airbag fixing shell, 133. Sealing ring, 132. Inductive airbag, 134. Connecting through hole, 135. Placement cavity, 14. Drain port;

[0041] 2. Rechargeable battery, 3. Capsule breaker, 4. Protective container. DETAILED DESCRIPTION

[0042] The specific implementation methods of the present utility model will be further explained in detail below by describing the optimal embodiments with reference to the accompanying drawings.

[0043] A dual-sensing fire extinguishing mechanism 1 for battery charging comprises a protective shell 11, wherein a protective medium 12 is arranged on the side of the protective shell 11 away from a rechargeable battery 2; a drain port 14 is arranged on the protective shell 11; the drain port 14 is connected to an airbag drain valve 13; the airbag drain valve 13 can be damaged after being acted upon by the rechargeable battery 2 to leak the protective medium 12; the fire extinguishing mechanism 1 disclosed in the utility model can be acted upon by the rechargeable battery 2 during battery charging to cause the airbag drain valve 13 to be damaged and opened; then the protective medium 12 isolated by the protective shell 11 in the fire extinguishing mechanism 1 can flow to the rechargeable battery 2; thereby realizing a cooling operation of the rechargeable battery 2, and when the rechargeable battery 2 catches fire, the protective medium 12 can be used to extinguish the fire of the rechargeable battery 2.

[0044] The dual-sensing fire extinguishing mechanism 1 disclosed in the utility model essentially has two opening modes, one is mechanical opening, and the other is thermal radiation opening. Mechanical opening is that the charged battery 2 expands, causing it to squeeze the airbag drain valve 13, causing it to break, and then achieving the outflow of the protective medium 12, while thermal radiation opening is mainly caused by thermal runaway during battery charging, which generates heat by itself or combustion, causing the airbag drain valve 13 to be damaged by heat.

[0045] Essentially, the airbag drain valve 13 is destroyed by the working condition of the rechargeable battery 2 during charging, so that the airbag drain valve 13 is damaged and loses the function of isolating the protective medium 12 .

[0046] That is, the fire extinguishing mechanism 1 disclosed in the utility model can have two opening modes. The utility model comprises a protective shell 11, and a protective medium 12 is provided on the side of the protective shell 11 away from the rechargeable battery 2; a drain port 14 is provided on the protective shell 11; the drain port 14 is connected to an airbag drain valve 13; the airbag drain valve 13 can be damaged after being acted upon by the rechargeable battery 2 to leak the protective medium 12;

[0047] In the utility model, each fire extinguishing mechanism 1 includes a protective shell 11, and a protective medium 12 is provided on the side of the protective shell 11 away from the rechargeable battery 2; the main function of the protective shell 11 is to isolate the protective medium 12 from contacting the rechargeable battery 2, so as to prevent the protective medium 12 from contacting the rechargeable battery 2 when the battery does not spontaneously combust or expand, thereby affecting the normal charging of the rechargeable battery 2 and its service life.

[0048] In the present invention, the protective medium 12 is generally water, of course, other media are also feasible, such as some other aqueous solutions with high heat capacity, non-combustibility, and high fluidity; the reason why the present invention uses water is because water as the protective medium 12 has extremely low use cost.

[0049] In the present invention, the protective medium 12 plays the role of cooling and extinguishing fire. Before the rechargeable battery burns, that is, before the rechargeable battery fire starts, the external temperature of the battery is reduced to prevent the battery from triggering thermal runaway. In actual use, the protective medium is generally water. Of course, other media are also feasible. The reason why the present invention uses water is because water as the protective medium 12 has extremely low use cost. Of course, the protective medium is not limited to water. Other aqueous solutions with high heat capacity, non-combustibility and high fluidity are also feasible.

[0050] At the same time, the protective medium also has the function of absorbing harmful components formed after the battery burns.

[0051] In other words, the protective medium disclosed in the present invention has three main functions: cooling, extinguishing fire and partially absorbing harmful components.

[0052] Furthermore, in the utility model, the fire extinguishing mechanism 1 is arranged at a peripheral position of the rechargeable battery 2; the airbag drain valve 13 on the protective shell 11 can be damaged after being acted upon by the rechargeable battery 2 to leak out the protective medium 12, so that in subsequent use, when the rechargeable battery 2 spontaneously ignites or expands, the rechargeable battery 2 can quickly act on the airbag drain valve 13, thereby achieving damage to the airbag drain valve 13 and causing the airbag drain valve 13 to lose its isolation function, thereby causing the protective medium 12 to move to the side of the rechargeable battery 2, thereby achieving corresponding fire extinguishing and cooling operations.

[0053] At the same time, it should be noted that the rechargeable battery 2 of the utility model can apply mechanical squeezing force or overheating temperature to the airbag drain valve 13; the airbag drain valve 13 can be damaged by mechanical squeezing force, and the damage to the corresponding area of ​​the airbag drain valve 13 can be achieved by temperature. The essence of both is to make the airbag drain valve 13 lose its isolation function and prevent the normal flow of the protective medium 12.

[0054] Furthermore, in the utility model, a protective medium 12 is provided on the side of the protective shell 11 away from the rechargeable battery 2; the protective shell 11 can be a box structure with a cavity inside, or a plate structure, as long as it can play an isolation role and prevent the corresponding protective medium 12 from passing through the protective shell 11 and flowing to the rechargeable battery 2.

[0055] When the protective shell 11 is in a box structure, a first medium storage cavity is formed inside.

[0056] In normal use, the protective shell 11 is mostly a box structure, and such a configuration facilitates the storage of the protective medium 12 in the fire extinguishing mechanism 1 .

[0057] Furthermore, in the utility model, a drain port 14 is provided on the protective shell 11; the setting of the drain port 14 facilitates the discharge operation of the protective medium 12 in the protective shell 11, and the drain port 14 is connected to an airbag drain valve 13; the airbag drain valve 13 acts as a blocking member, which is mainly used to control the opening and closing of the drain port 14, and then control the discharge operation of the protective medium 12 in the protective shell 11; in the utility model, the airbag drain valve 13 includes an inductive airbag body 132 for blocking the drain port 14; here, the inductive airbag body 13 2 is essentially a hot-melt airbag. When the temperature reaches a certain value, the inductive airbag body 132 will be damaged, so that it will be separated from the drain port 14, thereby realizing the external discharge operation of the protective medium 12 in the protective shell 11. At the same time, the inductive airbag body 132 of the utility model can also be damaged by external force, such as puncture, impact damage, etc.; after the inductive airbag body 132 of the utility model is damaged, the inductive airbag body 132 can no longer block the drain port 14, thereby realizing the external discharge operation of the water in the protective shell 11.

[0058] Furthermore, in the utility model, the airbag drain valve 13 also includes an airbag fixing shell 131 arranged on the protective shell 11, and the airbag fixing shell 131 is installed on the protective shell 11. The airbag drain valve 13 includes an inductive airbag body 132 for blocking the drain port 14; the inductive airbag body 132 is a hot-melt airbag; the setting of the airbag fixing shell 131 facilitates the installation and connection of the inductive airbag body 132, and in the utility model, the airbag fixing shell 131 is hollow inside to form a placement cavity 135; the setting of the placement cavity 135 facilitates the arrangement of the inductive airbag body 132 Placement; and in the utility model, a connecting through hole 134 is provided on the airbag fixing shell 131; the connecting through hole 134 mainly plays a connecting role, and the connecting through hole 134 is set to penetrate the airbag fixing shell 131, mainly for the waterproof port to be connected with the outside of the protective shell 11 through the connecting through hole 134, and also for the internal cavity of the protective shell 11 to be connected with the outer space thereof; the drain port 14 is connected with the side of the protective shell 11 away from the rechargeable battery 2 through the connecting through hole 134; such a setting facilitates the protective medium 12 in the protective shell 11 to flow out to the outside of the protective shell 11 through the airbag drain valve 13.

[0059] At the same time, in the utility model, a sealing ring 133 is provided on the inner wall of the airbag fixing shell 131; the sealing ring 133 can be evenly distributed on the inner wall of the airbag fixing shell 131, or can be arranged at the corners inside the airbag fixing shell 131. Here, the sealing ring 133 mainly plays a good blocking and limiting role, ensuring the stability of the placement of the inductive airbag body 132 in the airbag fixing shell 131; at the same time, the sealing ring 133 also plays a good sealing role, ensuring the sealing between the inductive airbag body 132 and the airbag fixing shell 131, and preventing the protective medium 12 from overflowing from the joint between the inductive airbag body 132 and the airbag fixing shell 131.

[0060] At the same time, in the utility model, the airbag drain valve 13 can be arranged on the inner side or the outer side of the protective shell 11; the airbag drain valve 13 is arranged on the inner side of the protective shell 11, which can reduce the force on the induction airbag body 132 and optimize the use condition of the induction airbag body 132.

[0061] The airbag drain valve 13 is arranged outside the protective shell 11; it is closer to the rechargeable battery 2, which facilitates the quickness and rapidity of subsequent damage and water discharge.

[0062] Furthermore, in the present invention, the drain port 14 is a square, circular or irregular hole; such a configuration facilitates the processing of the drain port 14 and also facilitates the subsequent discharge operation of the protective medium 12 .

[0063] A protection assembly for battery charging includes a bag breaking mechanism and the dual-sensing fire extinguishing mechanism 1; each dual-sensing fire extinguishing mechanism 1 corresponds to a bag breaking mechanism; the bag breaking mechanism includes a bag breaker 3 arranged on the rechargeable battery 2; in the utility model, the bag breaking mechanism is generally connected to the corresponding rechargeable battery 2 when in use, and the setting of the bag breaking mechanism is mainly used in conjunction with the fire extinguishing mechanism 1, mainly to achieve partial or complete damage to the airbag drain valve 13, so that the protective medium 12 isolated by the protective shell 11 flows to the rechargeable battery 2.

[0064] At the same time, in the utility model, the bag breaking mechanism includes a bag breaker 3 arranged on the rechargeable battery 2; the setting of the bag breaker 3 is equivalent to adding a protrusion on the rechargeable battery 2 to ensure that when the battery expands subsequently, the battery squeezes the corresponding airbag drain valve 13; in other words, by reducing the contact area, the battery expansion will make it easier to damage the airbag drain valve 13; here, the bag breaker 3 mainly acts on the induction airbag body 132 in the airbag drain valve 13.

[0065] In the utility model, the main body of the bag breaker 3 is a conical structure, and the tip of the bag breaker 3 is arranged close to the airbag drain valve 13. The bag breaker 3 can be connected to the rechargeable battery 2 through a suction cup, a buckle or a bolt. The main function of the setting of the bag breaker 3 is to enable the expansion of the battery to better break the corresponding airbag drain valve 13.

[0066] Furthermore, in the utility model, the protection assembly also includes a protection container 4, the dual-sensing fire extinguishing mechanism 1 is connected to the protection container 4, and the battery 2 to be charged is arranged in the protection container 4; a placement area for placing the rechargeable battery 2 is provided in the protection container 4; the charging protection device includes at least one fire extinguishing mechanism 1 arranged on the protection container 4; the utility model can achieve protection for the rechargeable battery 2 during charging through the coordinated use of the protection container 4 and the fire extinguishing mechanism 1; at the same time, the overall structure of the convenient and open charging protection device is relatively simple and low in cost, and can achieve isolation protection for the rechargeable battery 2 during indoor charging, thereby avoiding economic losses caused by battery combustion during indoor charging.

[0067] The charging protection device disclosed in the present utility model is mainly suitable for protecting soft-pack lithium-ion batteries during indoor charging; however, it does not mean that it cannot be used for charging protection operations of other batteries; in theory, the charging protection device disclosed in the present utility model can be used for charging protection operations of any rechargeable battery 2; it mainly has a better protective effect on indoor charging of soft-pack lithium batteries, and can also achieve a good protection effect at the lowest price.

[0068] Specifically, the charging protection device disclosed in the utility model mainly includes a protection container 4, which mainly plays a role of isolation and protection, and also facilitates the arrangement of the battery 2 to be charged, and also facilitates the arrangement and placement of the subsequent protection medium 12 and the fire extinguishing mechanism 1; in actual design, the protection container 4 can be made of insulating materials or other materials, and the specific material can be selected according to needs.

[0069] In addition, in the utility model, a placement area for placing the rechargeable battery 2 is provided in the protective container 4; the placement area here is mainly for the convenience of placing the rechargeable battery 2, and is essentially a space formed in the protective container 4 for placing the battery 2 to be charged. In the utility model, the above-mentioned placement area can be assembled by panels, or it can be an area enclosed when each fire extinguishing mechanism 1 is distributed at intervals.

[0070] Furthermore, in the utility model, the charging protection device includes at least one fire extinguishing mechanism 1 arranged on the protection container 4; the setting of the fire extinguishing mechanism 1 is mainly used to cool the rechargeable battery 2, which essentially has the function of extinguishing fire and preventing thermal runaway of the battery.

[0071] The type of fire extinguishing mechanism 1 can be selected as needed, and essentially any fire extinguishing device that can achieve battery cooling and fire extinguishing operations can be used.

[0072] Meanwhile, in the utility model, the protective container 4 comprises a container shell; the container shell is provided with a smoke-proof cover, and the smoke-proof cover covers the container shell, so as to achieve an overall sealing effect of the protective container 4 and prevent subsequent spillage of the protective medium 12.

[0073] Of course, in order to discharge smoke or other gases in the smoke-proof container, the utility model requires that a smoke exhaust pipe be provided on the protective cover. The smoke exhaust pipe can be connected to an external pipeline to lead the exhaust gas in the protective container 4 to the outside, thereby preventing the exhaust gas in the protective container 4 from polluting the indoor environment.

[0074] specific:

[0075] The utility model discloses a fire extinguishing mechanism 1, which does not need to design a separate energy source or a separate control system, and can use the inherent characteristics of existing extremely simple components to achieve excellent use effects.

[0076] In other words, the fire extinguishing mechanism 1 disclosed in the present invention can achieve the protective effect of the rechargeable battery 2 at an extremely low cost.

[0077] It is essentially different from existing battery protection.

[0078] The fire extinguishing mechanism 1 disclosed in the utility model includes a protective shell 11; a protective medium 12 is arranged in the protective shell 11; a water discharge port 14 is arranged on the protective shell 11; the water discharge port 14 is connected to an airbag water discharge valve 13; the airbag water discharge valve 13 includes an inductive airbag body 132 for blocking the water discharge port 14; the airbag water discharge valve 13 also includes an airbag fixing shell 131 arranged on the protective shell 11, and the airbag fixing shell 131 is hollow inside to form a placement cavity 135; a connecting through hole 134 is arranged on the airbag fixing shell 131; the water discharge port 14 is connected to the side of the protective shell 11 away from the rechargeable battery 2 through the connecting through hole 134; a sealing ring 133 is arranged on the inner side wall of the airbag fixing shell 131.

[0079] The first fire extinguishing mechanism 1 can be arranged on the outside or inside of the protective container 4. At the same time, the first fire extinguishing mechanism 1 can be hung on the inner wall of the protective container 4 through a hanging block. In order to facilitate hanging, a hanging sink can be set on the inner wall of the protective container 4.

[0080] The utility model is based on the public use of the protection assembly, and does not require personnel to be on duty during indoor charging; at the same time, it does not require external energy, nor does it require a control system to assist in protecting the rechargeable battery 2.

[0081] The utility model can realize the function of battery thermal runaway heat source induction melting and breaking valve opening and water release without active heat source and the function of battery expansion force self-induction mechanical rupture and valve opening and water release without active mechanical driving source through the coordinated use of the fire extinguishing mechanism 1 and the protective container 4.

[0082] The protective device disclosed by the utility model can achieve the functions of cooling the battery to prevent further thermal runaway and extinguishing fire.

[0083] The fire extinguishing mechanism 1 disclosed in the utility model mainly comprises: a protective shell 11; a protective medium 12 is arranged in the protective shell 11, and a drain port 14 is arranged on the protective shell 11 to facilitate the outflow of the protective medium 12. At the same time, in order to facilitate the on-off control of the drain port 14, an air bag drain valve 13 is arranged at the position of the drain port 14 in the utility model.

[0084] The airbag drain valve 13 mainly includes an inductive airbag body 132. In the present invention, the inductive airbag body 132 is a hot-melt airbag structure, which can be damaged after being hit by external force. At the same time, after being subjected to corresponding heat radiation from the outside, the inductive airbag body 132 will also be damaged. Therefore, there are two main ways of damage to the airbag drain valve 13 of the present invention, one is external force impact or puncture, and the other is heat damage.

[0085] At the same time, the airbag drain valve 13 of the utility model also includes an airbag fixing shell 131 arranged on the protective shell 11, and the airbag fixing shell 131 is hollow inside to form a placement cavity 135; a connecting through hole 134 is provided on the airbag fixing shell 131; the drain port 14 is connected to the side of the protective shell 11 away from the rechargeable battery 2 through the connecting through hole 134; a sealing ring 133 is provided on the inner side wall of the airbag fixing shell 131.

[0086] In the utility model, the end of the bag breaker 3 close to the corresponding inductive airbag body 132 is slender and sharp, and is designed towards the battery side with a shape and structure that is convenient for fixing to the top outer shell of the battery; at the same time, its material is a rigid material that is not easy to break brittlely, and its size is such that after being fixed on the top of the battery pack, its slender and sharp end is as close as possible to the surface of the above-mentioned inductive airbag body 132.

[0087] In addition, in the utility model, the airbag drain valve 13 includes an inductive airbag body 132; it has the following working conditions, (a) when the battery is not expanded and not thermally runaway, the airbag is filled with gas to achieve elastic and tight mechanical contact with the airbag fixing shell 131 and the sealing ring 133 to achieve the airtight and leak-proof sealing of the above-mentioned airbag drain valve 13, (b) when the battery pack is short-circuited or overcharged, the battery expands; the battery deformation lifts or pushes the bag breaker 3 to move, so that the bag breaker 3 breaks the corresponding inductive airbag body 132; thereby causing the corresponding inductive airbag body 132 to be punctured, or when the battery pack is short-circuited or overcharged, the battery automatically melts and breaks when hot smoke or even catches fire due to hot airbags, thereby releasing the gas in the airbag, releasing the tight mechanical contact with other components of the above-mentioned airbag drain valve 13, and quickly opening the drain valve to release water to the corresponding battery pack.

[0088] The inductive airbag body 132 in the airbag drain valve 13 disclosed in the utility model can be made of (a) a mixture of one or more modified species of rubber, polyethylene, polypropylene, rubber and / or polyethylene and / or polypropylene; and (b) the hot melting temperature of the inductive airbag body 132 is required to be in the range of 50-150°C.

[0089] Meanwhile, the dimensions of the inductive airbag 132 require that the wall thickness of the airbag be 0.001 mm to 5 mm; the diameter of the airbag be in the range of 1 mm to 500 mm.

[0090] Meanwhile, the shape and size of the drain port 14 on the protective housing 11 of the present invention are set as follows: the shape is a round hole, a square hole or an irregular hole; the hole diameter ranges from 1mm to 450mm.

[0091] Meanwhile, for the airbag drain valve 13, the utility model requires that the airbag fixing shell 131 and the sealing ring 133 can be designed as an integrated structure or a split structure, which can be selected according to the actual working conditions.

[0092] The protective container 4 disclosed in the utility model can be 1) a rigid container, 2) a flexible container, 3) a container that is partially rigid and partially flexible; (B) the volume range of the protective container 4 is 1000 cubic centimeters to 10 cubic meters, which is as roughly equivalent to the size of the battery placed therein as possible; (C) at the same time, the protective container 4 is required to be able to maintain non-combustion and non-softening for 10 seconds to 30 minutes at a high temperature of 100 to 1000°C, ensuring that the combustion of the battery placed therein is terminated and the temperature is lowered to a point where there is no longer a fire hazard, and the above-mentioned protective container 4 can continue to maintain the fire prevention and gas leakage prevention functions; and (D) it can be connected to a smoke exhaust pipe to ensure that when the battery burns, the gas in the above-mentioned protective container 4 can be smoothly discharged to the outside through the above-mentioned smoke exhaust pipe.

[0093] In summary, the above-mentioned protective container 4 can be a hard shell box, and the shape of the above-mentioned protective container 4 can be one or more of the following shapes: 1) cylinder, 2) original cone, 3) cube, 4) rectangular parallelepiped, 5) trapezoidal column, 6) special shape combining circle and square.

[0094] Taking the protective container 4 as an example, a cube or a rectangular parallelepiped is better, which is convenient for sheet metal processing and better matches the cube or rectangular parallelepiped shape of the battery pack.

[0095] The fire extinguishing mechanism 1 disclosed in the utility model can automatically start the fire-fighting function in the protective container 4 when a lithium-ion or sodium-ion battery at rest or being charged in the protective container 4 burns due to "thermal runaway" or the battery swells and is about to burn or there is a risk of burning. The fire-fighting function can be quickly and efficiently released into the protective container 4 in a limited amount within 1 second to 60 seconds, and the fire can be quickly extinguished in the protective container 4 within 5 seconds to 300 seconds without spreading to the room, or the battery can be quickly cooled before burning to prevent burning, so as to ensure the safety of user life, property and public safety.

[0096] Obviously, the specific implementation of the present invention is not limited by the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A dual-sensing fire extinguishing mechanism for battery charging, characterized in that: It comprises a protective shell, wherein a protective medium is provided on a side of the protective shell away from the rechargeable battery; The protective shell is provided with a drain port; the drain port is connected to an airbag drain valve; the airbag drain valve can be damaged and leak protective medium after being acted upon by a rechargeable battery.

2. A dual-sensing fire extinguishing mechanism for battery charging according to claim 1, characterized in that: The air bag drain valve comprises an induction air bag body for blocking the drain port.

3. A dual-sensing fire extinguishing mechanism for battery charging according to claim 2, characterized in that: The induction airbag body is a hot-melt airbag.

4. A dual-sensing fire extinguishing mechanism for battery charging according to any one of claims 2-3, characterized in that: The airbag drain valve also includes an airbag fixing shell arranged on the protective shell, and the interior of the airbag fixing shell is hollow to form a placement cavity; the airbag fixing shell is provided with a connecting through hole; the drain port is connected to the side of the protective shell away from the rechargeable battery through the connecting through hole; the induction airbag body is connected to the protective shell through the airbag fixing shell.

5. A dual-sensing fire extinguishing mechanism for battery charging according to claim 4, characterized in that: A sealing ring is arranged on the inner side wall of the air bag fixing shell.

6. A dual-sensing fire extinguishing mechanism for battery charging according to any one of claims 1 to 3, characterized in that: The air bag drain valve is arranged inside the protective shell.

7. A dual-sensing fire extinguishing mechanism for battery charging according to any one of claims 1 to 3, characterized in that: The water outlet is a square, round or irregular hole.

8. A battery charging protection assembly, characterized in that: It comprises a bag breaking mechanism and a dual-sensing fire extinguishing mechanism as claimed in any one of claims 1 to 7; each dual-sensing fire extinguishing mechanism corresponds to a bag breaking mechanism; the bag breaking mechanism comprises a bag breaking device arranged on a rechargeable battery.

9. A battery charging protection assembly according to claim 8, characterized in that: The capsule breaker is cone-shaped.

10. A battery charging protection assembly according to claim 8, characterized in that: The protection assembly also includes a protection container, the dual-sensing fire extinguishing mechanism is connected to the protection container, and the battery to be charged is arranged in the protection container.

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