Battery fire retardant device
Patent Information
- Application Number
- CN202510418468.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-10-16
AI Technical Summary
[0003]传统电池阻燃装置多依赖单一防护手段，存在响应滞后、阻燃效率低、结构冗余度不足等问题，主要问题在于，需要使用大量的传感器对电池的状态进行检测，在紧急状态下，若传感器失能会导致阻燃机构无法正常运作，进而导致火灾事故发生的风险增加
本发明通过设置第一挡板、第一阻隔条、第二挡板等结构的配合，使得装置能够在蓄电池发生燃烧时，内部化学反应会释放大量热量和气体，由于蓄电池内部的压力释放，使得产生的气体挤压第一挡板或第二挡板，将其位置进行推动，进而带动第一阻隔条和第二阻隔条的位置进行移动，使得出液口一端的通孔不受第一阻隔条和第二阻隔条的堵塞，进而使得阻隔盒内部的夹层与阻隔盒连通，并且连通位置为第一挡板或第二挡板受挤压的靠近蓄电池的一端，该处为泄压端，此时磷系阻燃剂通过出液口移动到泄压端，对该处进行阻燃处理，以此来达成便于装置对蓄电池自燃时自动对其覆盖磷系阻燃剂进行阻燃的目的。
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Figure CN122912394A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of battery flame retardant technology, specifically a battery flame retardant device. Background Technology
[0002] With the widespread application of lithium-ion batteries in new energy vehicles, energy storage systems and consumer electronics, safety issues such as combustion and explosion caused by thermal runaway are becoming increasingly prominent. According to statistics, in 2022, 78% of fire accidents caused by electric vehicle battery failures worldwide were caused by a chain exothermic reaction due to a short circuit inside the battery pack. Therefore, a battery flame retardant device is needed to avoid damage to the vehicle or the surrounding environment when the battery burns.
[0003] Traditional battery flame retardant devices often rely on a single protection method, which has problems such as delayed response, low flame retardant efficiency, and insufficient structural redundancy. The main problem is that a large number of sensors are needed to detect the battery status. In an emergency, if the sensors fail, the flame retardant mechanism will not be able to operate normally, thereby increasing the risk of fire accidents.
[0004] By using a mechanical self-triggered flame-retardant mechanism in conjunction with a sensor to retard the battery, and by setting multiple levels of flame-retardant methods, the battery can be flame-retarded. When the temperature initially becomes out of control, an alarm is triggered, and when the battery spontaneously combusts and produces gas, the flame-retardant mechanism is automatically activated to block the fire source. Summary of the Invention
[0005] To address the problems mentioned in the background art, this invention provides a battery flame-retardant device. When a battery burns, the internal chemical reaction releases a large amount of heat and gas, causing pressure release inside the battery. The resulting pressure triggers a flame-retardant mechanism that performs flame-retardant operations on the battery from multiple directions. At this time, a phosphorus-based flame retardant moves through the outlet to the pressure relief end for flame-retardant treatment. Furthermore, when the internal pressure of the battery is released, the trigger block is pushed upwards, causing it to pierce the liquid-blocking component through its top shape and remain suspended. This allows the nitrogen-based flame retardant inside the liquid storage tank to fall into the barrier box. As the trigger block moves upwards, the limiting plate enters the limiting seat and is limited by the limiting block, leaving the trigger block suspended. At this point, the liquid storage box and the barrier box... The flame retardant effect is enhanced by connecting the top cover plate with the phosphorus-based flame retardant inside the barrier box through the through holes. Nitrogen-based and phosphorus-based flame retardants are also incorporated. The phosphorus-based flame retardant decomposes at high temperatures to generate polyphosphoric acid, which promotes carbonization of the substrate through strong dehydration, forming a dense carbon layer covering the material surface and isolating oxygen and heat transfer. Nitrogen compounds release inert gases such as NH3 and N2 upon heating, driving the carbon layer to expand and foam, forming a porous, heat-insulating structure. Nitrogen reacts with the phosphorus source to generate phosphate amines, enhancing the stability of the carbon layer and inhibiting smoke generation. Furthermore, the phosphorus-nitrogen composite system can reduce the porosity of the carbon layer by 30% and increase the thermal decomposition temperature to over 300℃. The synergistic effect of phosphorus and nitrogen-based flame retardants through condensed phase carbon layer strengthening, gas phase free radical inhibition, and gas dilution significantly improves flame retardant efficiency.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a battery flame retardant device, comprising a barrier box, a top cover plate installed on the top of the barrier box, a storage battery disposed inside the barrier box, a flame retardant mechanism disposed inside the barrier box, a liquid storage box installed on the top of the top cover plate, a triggering mechanism disposed inside the top cover plate, and a limit mechanism disposed at one end of the triggering mechanism. The flame-retardant mechanism includes a first baffle, a first barrier strip, and a second baffle. The first baffle is movably connected inside the barrier box, and a first barrier strip is fixed to the outside of the first baffle. The second baffle is movably connected inside the barrier box, and a second barrier strip is fixed to the outside of the second baffle. The triggering mechanism includes a liquid storage tank, a liquid blocking component, and a trigger block. The liquid storage tank is located inside the liquid storage box, the liquid blocking component is installed inside the top cover plate, and the trigger block is movably connected inside the top cover plate. The limiting mechanism includes a mounting base and a connecting rod. The mounting base is fixed to the top of the trigger block, and the connecting rod is fixed to the top of the mounting base.
[0007] Preferably, a first return spring is fixed to the outside of the first baffle, a liquid outlet is provided inside the barrier box, an interlayer is provided inside the barrier box, the interlayer of the barrier box is filled with a phosphorus-based flame retardant, and one end of the liquid outlet is connected to the interlayer.
[0008] Preferably, the outer walls of the first baffle and the second baffle are close to the inner wall of the barrier box, the first baffle and the second baffle are slidably connected to the barrier box, one end of the first baffle and the second baffle is in contact with the battery, the outer walls of the first barrier strip and the second barrier strip are close to the inner wall of the barrier box, and the first barrier strip and the second barrier strip are slidably connected to the barrier box.
[0009] Preferably, four sets of liquid outlets are provided, and the liquid outlets are evenly distributed about the central axis of the barrier box. The first return spring is used to squeeze the first baffle and the second baffle and keep them moving outward. Two sets of the first return springs are provided, and the first return springs are symmetrically distributed about the central axis of the first baffle.
[0010] Preferably, the liquid storage tank is filled with a nitrogen-based flame retardant, the top cover plate has a through hole, a liquid blocking component is installed in the through hole, the outer wall of the trigger block is close to the inner wall of the top cover plate, the trigger block and the top cover plate are slidably connected, and the top of the trigger block is spike-shaped.
[0011] Preferably, a limiting plate is fixed to the top of the connecting rod, a limiting seat is fixed to the top inside the top cover plate, a limiting rod is movably connected inside the limiting seat, a second return spring is sleeved on the outside of the limiting rod, and a limiting block is fixed to the outside of the limiting rod.
[0012] Preferably, four sets of mounting seats are provided, and the mounting seats are evenly distributed about the central axis of the trigger block. Four sets of limiting seats are provided, and the limiting seats are evenly distributed about the central axis of the top cover plate. The diameter of the limiting plate is equal to the inner diameter of the limiting seat.
[0013] Preferably, two sets of limiting rods are provided, the limiting rods are symmetrically distributed about the central axis of the limiting seat, the outer wall of the limiting rod is close to the inner wall of the limiting seat, and the limiting rod and the limiting seat are slidably connected.
[0014] Preferably, the second return spring is used to press the limiting rod and the limiting block and keep them moving inward. One end of the limiting block is provided with an inclined surface, and the top end of the limiting plate is provided with an inclined surface.
[0015] Preferably, the bottom end of the top cover is fixed with a locking block, the top end of the barrier box is provided with a locking groove, the top cover and the barrier box are locked together, and the storage battery is provided with four sets.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordinated arrangement of a first baffle, a first barrier strip, and a second baffle, enables the device to automatically cover the battery with phosphorus-based flame retardant when the battery spontaneously combusts. This flame retardant releases a large amount of heat and gas due to the internal chemical reaction. The pressure release causes the generated gas to compress the first or second baffle, pushing it to a new position. This, in turn, moves the first and second barrier strips, preventing them from blocking the outlet. This allows the internal interlayer of the barrier box to connect with the barrier box, with the connection point being the end of the first or second baffle closest to the battery, which is the pressure relief end. At this point, phosphorus-based flame retardant moves through the outlet to the pressure relief end, applying flame retardant to that area. This achieves the purpose of automatically covering the battery with phosphorus-based flame retardant to retard spontaneous combustion.
[0017] This invention, through the combination of a liquid storage tank, a liquid blocking component, and a trigger block, enables the device to push the trigger block upwards when the pressure inside the battery is released. This causes the trigger block to puncture the liquid blocking component through the shape of its top, while remaining suspended in the air. This allows the nitrogen-based flame retardant inside the liquid storage tank to fall into the barrier box and come into contact with the phosphorus-based flame retardant inside the barrier box, thereby improving the flame retardant effect. This achieves the purpose of facilitating the flame retardant application of the device to the battery.
[0018] This invention, through the combination of a mounting base, connecting rod, and limiting plate, enables the device to allow the limiting plate to enter the interior of the limiting base when the trigger block moves upward, and to be limited by the limiting block, so that the trigger block is suspended in the air. At this time, the liquid storage box and the barrier box are connected through the through hole inside the top cover plate, allowing the nitrogen-based flame retardant to enter the interior of the barrier box, thereby achieving the purpose of facilitating the connection between the barrier box and the liquid storage box. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the overall internal structure of the present invention; Figure 4 This is a schematic diagram of the flame-retardant mechanism of the present invention. Figure 5 This is a schematic diagram of the flame-retardant mechanism of the present invention; Figure 6 This is a front view cross-sectional structural diagram of the triggering mechanism of the present invention; Figure 7 This is a schematic diagram of the triggering mechanism structure of the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of a partial cross-section at point A in the middle.
[0020] In the diagram: 1. Barrier box; 2. Top cover plate; 3. Battery; 4. Flame retardant mechanism; 401. First baffle; 402. First barrier strip; 403. Second baffle; 404. Second barrier strip; 405. First return spring; 406. Liquid outlet; 5. Liquid storage box; 6. Triggering mechanism; 601. Liquid storage chamber; 602. Liquid blocking component; 603. Trigger block; 7. Limiting mechanism; 701. Mounting base; 702. Connecting rod; 703. Limiting plate; 704. Limiting seat; 705. Limiting rod; 706. Second return spring; 707. Limiting block. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] like Figures 1 to 8 As shown, the present invention provides a battery flame retardant device, including a barrier box 1, a top cover plate 2 installed on the top of the barrier box 1, a storage battery 3 disposed inside the barrier box 1, a locking block fixed at the bottom of the top cover plate 2, a locking groove opened at the top of the barrier box 1, the top cover plate 2 and the barrier box 1 being locked together, four sets of storage batteries 3 being disposed, a flame retardant mechanism 4 disposed inside the barrier box 1, a liquid storage box 5 installed at the top of the top cover plate 2, a triggering mechanism 6 disposed inside the top cover plate 2, and a limit mechanism 7 disposed at one end of the triggering mechanism 6.
[0023] like Figures 1 to 8 As shown, the flame-retardant mechanism 4 includes a first baffle 401, a first barrier strip 402, and a second baffle 403. The first baffle 401 is movably connected to the inside of the barrier box 1, and the first barrier strip 402 is fixed to the outside of the first baffle 401. The second baffle 403 is movably connected to the inside of the barrier box 1, and the second barrier strip 404 is fixed to the outside of the second baffle 403. The outer walls of the first baffle 401 and the second baffle 403 are close to the inner wall of the barrier box 1. The first baffle 401 and the second baffle 403 are slidably connected to the barrier box 1. One end of the first baffle 401 and the second baffle 403 is in contact with the battery 3. The outer walls of the first barrier strip 402 and the second barrier strip 404 are close to the inner wall of the barrier box 1. The first barrier strip 402 and the second barrier strip 404 are slidably connected to the barrier box 1.
[0024] like Figures 1 to 8As shown, a first return spring 405 is fixed to the outside of the first baffle 401. An outlet 406 is provided inside the barrier box 1. An interlayer is provided inside the barrier box 1. The interlayer of the barrier box 1 is filled with a phosphorus-based flame retardant. One end of the outlet 406 is connected to the interlayer. There are four sets of outlets 406. The outlets 406 are evenly distributed about the central axis of the barrier box 1. The first return spring 405 is used to squeeze the first baffle 401 and the second baffle 403 and keep them moving outward. There are two sets of first return springs 405. The first return springs 405 are symmetrically distributed about the central axis of the first baffle 401.
[0025] The above solution involves releasing the internal pressure of the battery 3, causing the generated gas to compress the first baffle 401 or the second baffle 403, pushing its position. This, in turn, moves the first barrier strip 402 and the second barrier strip 404, preventing the through hole at one end of the outlet 406 from being blocked by the first barrier strip 402 and the second barrier strip 404. This allows the interlayer inside the barrier box 1 to connect with the barrier box 1, with the connection point being the end of the first baffle 401 or the second baffle 403 that is compressed and closer to the battery 3. At this time, the phosphorus-based flame retardant moves to the pressure relief end through the outlet 406 and performs flame retardant treatment on that area.
[0026] like Figures 1 to 8 As shown, the triggering mechanism 6 includes a liquid storage tank 601, a liquid blocking component 602, and a trigger block 603. The liquid storage tank 601 is located inside the liquid storage box 5. The liquid blocking component 602 is installed inside the top cover plate 2. The trigger block 603 is movably connected to the inside of the top cover plate 2. The liquid storage tank 601 is filled with a nitrogen-based flame retardant. The top cover plate 2 has a through hole. The liquid blocking component 602 is installed in the through hole of the top cover plate 2. The outer wall of the trigger block 603 is close to the inner wall of the top cover plate 2. The trigger block 603 and the top cover plate 2 are slidably connected. The top of the trigger block 603 is spike-shaped.
[0027] The above scheme is adopted: when the pressure inside the battery 3 is released, the trigger block 603 is squeezed upward, so that it punctures the liquid blocking component 602 through the shape of its top end, and keeps itself suspended in the air. This causes the nitrogen-based flame retardant inside the liquid storage tank 601 to fall into the interior of the barrier box 1, where it flame-retards the battery 3 and comes into contact with the phosphorus-based flame retardant inside the barrier box 1, thereby improving the flame-retardant effect.
[0028] like Figures 1 to 8As shown, the limiting mechanism 7 includes a mounting base 701 and a connecting rod 702. The mounting base 701 is fixed to the top of the trigger block 603. The connecting rod 702 is fixed to the top of the mounting base 701. The limiting plate 703 is fixed to the top of the connecting rod 702. The limiting seat 704 is fixed to the top inside the top cover plate 2. There are four sets of mounting bases 701, which are evenly distributed about the central axis of the trigger block 603. There are four sets of limiting seats 704, which are evenly distributed about the central axis of the top cover plate 2. The diameter of the limiting plate 703 is equal to the inner diameter of the limiting seat 704.
[0029] like Figures 1 to 8 As shown, a limiting rod 705 is movably connected inside the limiting seat 704. A second return spring 706 is sleeved on the outside of the limiting rod 705. A limiting block 707 is fixed on the outside of the limiting rod 705. There are two sets of limiting rods 705. The limiting rods 705 are symmetrically distributed about the central axis of the limiting seat 704. The outer wall of the limiting rod 705 is close to the inner wall of the limiting seat 704. The limiting rod 705 and the limiting seat 704 are slidably connected. The second return spring 706 is used to press the limiting rod 705 and the limiting block 707 and keep them moving inward. One end of the limiting block 707 is provided with a slope. The top end of the limiting plate 703 is provided with a slope.
[0030] Using the above scheme: When the trigger block 603 moves upward, the limiting plate 703 enters the interior of the limiting seat 704. After the limiting plate 703 contacts the limiting block 707, it presses the limiting block 707 inward. After the limiting plate 703 passes the limiting block 707, the second return spring 706 resets the limiting block 707, so that the limiting block 707 is located at the bottom end of the limiting plate 703, thereby limiting the limiting plate 703. This makes the trigger block 603 suspended. At this time, the liquid storage box 5 and the barrier box 1 are connected through the through hole inside the top cover plate 2, allowing the nitrogen-based flame retardant to enter the interior of the barrier box 1, and the phosphorus-based flame retardant at high temperature... The decomposition process generates polyphosphoric acid, which promotes the carbonization of the substrate through strong dehydration, forming a dense carbon layer that covers the material surface, isolating oxygen and heat transfer. Nitrogen compounds release inert gases such as NH3 and N2 when heated, which promotes the expansion and foaming of the carbon layer, forming a porous heat-insulating structure. Nitrogen reacts with phosphorus sources to generate phosphate amines, which enhance the stability of the carbon layer and inhibit the generation of smoke and dust. Furthermore, the phosphorus-nitrogen composite system can reduce the porosity of the carbon layer by 30% and increase the thermal decomposition temperature to over 300℃. Through the synergistic effect of phosphorus and nitrogen systems in strengthening the condensed phase carbon layer, inhibiting gas phase free radicals, and diluting gases, the flame retardant efficiency is significantly improved.
[0031] The working principle and usage process of this invention: When the battery 3 burns, the internal chemical reaction releases a large amount of heat and gas. Due to the pressure release inside the battery 3, the generated gas squeezes the first baffle 401 or the second baffle 403, pushing its position, which in turn moves the positions of the first barrier strip 402 and the second barrier strip 404. This prevents the through hole at one end of the outlet 406 from being blocked by the first barrier strip 402 and the second barrier strip 404, thereby allowing the interlayer inside the barrier box 1 to communicate with the barrier box 1. The communication position is the end of the first baffle 401 or the second baffle 403 that is squeezed and is closer to the battery 3. This is the pressure relief end. At this time, the phosphorus-based flame retardant moves to the pressure relief end through the outlet 406 and performs flame retardant treatment on this area. When the internal pressure is released, the trigger block 603 is pushed upward, causing it to pierce the liquid-blocking component 602 through the shape of its top end. The limiting plate 703 enters the interior of the limiting seat 704. After the limiting plate 703 contacts the limiting block 707, it pushes the limiting block 707 inward. After the limiting plate 703 passes the limiting block 707, the second return spring 706 resets the limiting block 707, so that the limiting block 707 is located at the bottom of the limiting plate 703, thereby limiting the limiting plate 703. This causes the trigger block 603 to be suspended in the air. At this time, the liquid storage box 5 and the barrier box 1 are connected through the through hole inside the top cover plate 2, allowing the nitrogen-based flame retardant inside the liquid storage chamber 601 to fall into the interior of the barrier box 1 and come into contact with the phosphorus-based flame retardant inside the barrier box 1, thereby improving the flame retardant effect.
[0032] Phosphorus-based flame retardants decompose at high temperatures to generate polyphosphoric acid, which promotes carbonization of the substrate through strong dehydration, forming a dense char layer that covers the material surface, isolating oxygen and heat transfer. Nitrogen compounds release inert gases such as NH3 and N2 upon heating, driving the char layer to expand and foam, forming a porous, heat-insulating structure. Nitrogen reacts with phosphorus sources to generate phosphate amines, enhancing the stability of the char layer and inhibiting smoke generation. Furthermore, the phosphorus-nitrogen composite system can reduce the porosity of the char layer by 30% and increase the thermal decomposition temperature to over 300℃. Through the synergistic effects of condensed-phase char layer strengthening, gas-phase free radical suppression, and gas dilution, phosphorus and nitrogen-based flame retardants significantly improve flame retardant efficiency. Moreover, the smoke density of nitrogen-based and phosphorus-based flame retardants is reduced by more than 40% during combustion, and the released CO2, H2O, and other toxic gases are also reduced. Its toxicity is far lower than that of halogenated flame retardants, avoiding persistent pollutants such as dioxins produced by traditional halogenated flame retardants. The synergistic effect of phosphorus and nitrogen-based flame retardants is enhanced through condensed phase carbon layer strengthening, gas phase free radical suppression, and environmentally friendly and low-toxicity characteristics. A temperature sensor and a buzzer alarm are installed inside the barrier box 1. The temperature sensor integrates a temperature-sensitive element, ADC, and digital interface. It measures the temperature by measuring the change of semiconductor PN junction voltage with temperature. When the temperature sensor detects that the temperature of the battery 3 inside the barrier box 1 reaches an abnormal value of 80°, it sends a signal to the buzzer alarm to remind the user to perform a quality inspection of the battery 3. The temperature data is also displayed on the user's monitoring terminal for real-time monitoring of the battery.
[0033] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. This meets the high flame-retardant requirements of scenarios such as electronic packaging and automotive interiors, effectively retarding the combustion of batteries.
[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A battery flame-retardant device, comprising a barrier box (1), characterized in that: The top of the barrier box (1) is equipped with a top cover plate (2), the inside of the barrier box (1) is equipped with a storage battery (3), the inside of the barrier box (1) is equipped with a flame retardant mechanism (4), the top of the top cover plate (2) is equipped with a liquid storage box (5), the inside of the top cover plate (2) is equipped with a triggering mechanism (6), and one end of the triggering mechanism (6) is equipped with a limit mechanism (7). The flame-retardant mechanism (4) includes a first baffle (401), a first barrier strip (402), and a second baffle (403). The first baffle (401) is movably connected to the inside of the barrier box (1), and the first barrier strip (402) is fixed to the outside of the first baffle (401). The second baffle (403) is movably connected to the inside of the barrier box (1), and the second barrier strip (404) is fixed to the outside of the second baffle (403). The triggering mechanism (6) includes a liquid storage tank (601), a liquid blocking component (602), and a trigger block (603). The liquid storage tank (601) is located inside the liquid storage box (5). The liquid blocking component (602) is installed inside the top cover plate (2). The trigger block (603) is movably connected inside the top cover plate (2). The limiting mechanism (7) includes a mounting base (701) and a connecting rod (702). The mounting base (701) is fixed to the top of the trigger block (603), and the connecting rod (702) is fixed to the top of the mounting base (701).
2. The battery flame-retardant device according to claim 1, characterized in that: The first baffle (401) is fixed with a first return spring (405), the barrier box (1) is provided with a liquid outlet (406), the barrier box (1) is provided with a sandwich layer, the sandwich layer of the barrier box (1) is filled with a phosphorus flame retardant, and one end of the liquid outlet (406) is connected to the sandwich layer.
3. The battery flame-retardant device according to claim 2, characterized in that: The outer walls of the first baffle (401) and the second baffle (403) are close to the inner wall of the barrier box (1). The first baffle (401) and the second baffle (403) are slidably connected to the barrier box (1). One end of the first baffle (401) and the second baffle (403) is in contact with the battery (3). The outer walls of the first barrier strip (402) and the second barrier strip (404) are close to the inner wall of the barrier box (1). The first barrier strip (402) and the second barrier strip (404) are slidably connected to the barrier box (1).
4. The battery flame-retardant device according to claim 2, characterized in that: The liquid outlet (406) is provided in four sets. The liquid outlet (406) is distributed at equal intervals about the central axis of the barrier box (1). The first return spring (405) is used to squeeze the first baffle (401) and the second baffle (403) and keep them moving outward. The first return spring (405) is provided in two sets. The first return spring (405) is symmetrically distributed about the central axis of the first baffle (401).
5. The battery flame-retardant device according to claim 1, characterized in that: The liquid storage tank (601) is filled with a nitrogen-based flame retardant. The top cover plate (2) has a through hole. A liquid blocking component (602) is installed in the through hole of the top cover plate (2). The outer wall of the trigger block (603) is close to the inner wall of the top cover plate (2). The trigger block (603) and the top cover plate (2) are slidably connected. The top of the trigger block (603) is spike-shaped.
6. The battery flame-retardant device according to claim 1, characterized in that: The top end of the connecting rod (702) is fixed with a limiting plate (703), the top end of the top cover plate (2) is fixed with a limiting seat (704), the limiting seat (704) is movably connected with a limiting rod (705), a second return spring (706) is sleeved on the outside of the limiting rod (705), and a limiting block (707) is fixed on the outside of the limiting rod (705).
7. The battery flame-retardant device according to claim 6, characterized in that: The mounting base (701) is provided in four sets, and the mounting base (701) is distributed at equal intervals about the central axis of the trigger block (603). The limiting base (704) is provided in four sets, and the limiting base (704) is distributed at equal intervals about the central axis of the top cover plate (2). The diameter of the limiting plate (703) is equal to the inner diameter of the limiting base (704).
8. The battery flame-retardant device according to claim 6, characterized in that: Two sets of limiting rods (705) are provided. The limiting rods (705) are symmetrically distributed about the central axis of the limiting seat (704). The outer wall of the limiting rod (705) is close to the inner wall of the limiting seat (704). The limiting rod (705) and the limiting seat (704) are slidably connected.
9. The battery flame-retardant device according to claim 6, characterized in that: The second reset spring (706) is used to press the limiting rod (705) and the limiting block (707) and keep them moving inward. One end of the limiting block (707) is provided with an inclined surface, and the top end of the limiting disc (703) is provided with an inclined surface.
10. The battery flame-retardant device according to claim 1, characterized in that: The bottom end of the top cover plate (2) is fixed with a card block, the top end of the barrier box (1) is provided with a card slot, the top cover plate (2) and the barrier box (1) are connected by a card, and the storage battery (3) is provided with four sets.