Cold liquid power battery and fire extinguishing system thereof

Abstract

The utility model discloses a fire extinguishing system of a cold liquid power battery and the cold liquid power battery. A cold liquid power battery body comprises a packaging box body and a battery module in the packaging box body, the packaging box body comprises a battery module upper cover body and a cooling liquid bottom plate box body, and the cooling liquid bottom plate box body and the battery module upper cover body define the packaging box body for packaging the battery module; a closed cavity is formed in the cooling liquid bottom plate box body, and high-pressure cooling liquid is arranged in the closed cavity; one or more channels communicated with the battery module upper cover body and the closed cavity are arranged above the cooling liquid bottom plate box body, and fire-fighting sprayers are arranged in the channels; and a spraying opening of the fire-fighting sprayer is correspondingly formed in the inner part of the upper cover body of the battery module. The cold liquid power battery solves the problems that a traditional cold liquid power battery is difficult to quickly reach a fire origin from outside fire extinguishing, and fire-fighting gas stored in an energy storage system provided by a traditional fire extinguishing system for inside fire extinguishing is limited, so that timely fire extinguishing or thorough fire extinguishing is easily caused, and fire re-combustion is easily caused at high temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle energy storage batteries, in particular to a cold liquid power battery and a fire extinguishing system thereof. Background Art

[0002] As we all know, currently, when a fire occurs in an electric vehicle, it is often necessary to use multiple fire extinguishers or a large amount of water to extinguish the fire from the outside of the electric vehicle, which takes a long time and even if the fire is extinguished, the car is severely damaged.

[0003] This phenomenon is related to the fire mechanism of electric vehicles. When an electric vehicle experiences thermal runaway or impact fire, the flames typically ignite within the battery cells inside the battery pack. The battery panel housing and the vehicle exterior separate the ignition point from the fire extinguisher (or fire hose). This results in only visible smoke, but no visible fire. This makes it difficult for fire extinguishing powder or water to reach the ignition point, making it difficult to extinguish the fire immediately.

[0004] To address these issues, traditional firefighting systems currently employ built-in perfluorohexanone and heptafluoropropane gas fire extinguishing solutions, spraying the interior of the battery upon triggering the fire alarm. However, this also presents drawbacks: the energy storage system stores a limited amount of firefighting gas, resulting in a single-action response. If a fire is not completely extinguished on the first attempt or if the electronic components of the traditional firefighting system fail, the system loses the ability to extinguish the fire again, resulting in the risk of fire rekindling at high temperatures, even after a delay or incomplete extinguishing. Utility Model Content

[0005] The purpose of the present invention is to overcome the shortcomings of the traditional cold liquid power battery proposed in the above background technology, that is, it is difficult to quickly reach the source of the fire from the outside, and the traditional fire extinguishing system for internal fire extinguishing provides a limited storage system for fire-fighting gas, resulting in failure to extinguish the fire in time or completely, and the risk and problem of fire reigniting at high temperature, and propose a cold liquid power battery and its fire extinguishing system.

[0006] In order to solve the above technical problems, the utility model provides a fire extinguishing system for a cold liquid power battery, which is applied to:

[0007] A cold liquid power battery body, the cold liquid power battery body comprising a packaging box and a battery module arranged in the packaging box;

[0008] The packaging box includes a battery module upper cover and a coolant bottom box located at the bottom, and the coolant bottom box and the battery module upper cover form a packaging box that encapsulates the battery module;

[0009] The interior of the cooling liquid bottom plate box includes a sealed cavity, and high-pressure cooling liquid is arranged in the sealed cavity;

[0010] One or more channels connecting the battery module upper cover and the sealed cavity are installed above the coolant bottom plate box, and fire sprinklers are installed in the channels;

[0011] The spray port of the fire sprinkler is correspondingly arranged at a position inside the upper cover of the battery module.

[0012] Preferably, the high-pressure coolant in the closed cavity is a circulating coolant.

[0013] Preferably, a coolant inlet and a coolant outlet are provided on the coolant bottom plate box body, and the coolant inlet and the coolant outlet are provided on the outside of the battery module upper cover body, and the coolant inlet and the coolant outlet are connected in series to the coolant circuit, and the coolant circuit is connected to a liquid storage tank and a circulating compression pump.

[0014] Preferably, one or more battery pack modules are connected in series in the coolant circuit.

[0015] Preferably, it includes a fire fighting system, which includes a fire extinguishing tank filled with a fire extinguishing agent, and a delivery pipeline and a fire fighting valve for introducing the fire extinguishing agent into the battery body, so as to spray and extinguish the cold liquid power battery that triggers the fire alarm.

[0016] The utility model also provides a cold liquid power battery, which includes:

[0017] A cold liquid power battery body, comprising a packaging box and a battery module arranged in the packaging box; and also comprising the above-mentioned cold liquid power battery fire extinguishing system.

[0018] Compared with related technologies, the cold liquid power battery and fire extinguishing system provided by the present invention have the following beneficial effects:

[0019] 1. This utility model extinguishes fire from the source inside the battery, has a timely temperature sensor response, and can still work normally in a non-sealed and non-high-pressure environment of the battery box;

[0020] 2. The utility model has an ingenious structural design, simple and reliable parts assembly, and low cost;

[0021] 3. The utility model can be triggered actively or passively, and has high application flexibility;

[0022] 4. This utility model can be triggered by passive temperature sensing and does not rely on electronic components. It can still work normally under extreme conditions such as battery fire and electronic component failure.

[0023] 5. This utility model uses the coolant in the cold liquid power battery as a fire-fighting material, directly extinguishing the fire from inside the battery without adding additional fire-fighting materials, thus reducing costs;

[0024] 6. This utility model can serve as a first-trigger fire extinguishing system or as a supplementary fire extinguishing system after a traditional fire extinguishing system is triggered. If the traditional fire extinguishing system fails, it can spray and immerse the battery in coolant to completely extinguish the fire. This helps to achieve timely or complete fire extinguishing, prevent high temperatures from igniting other battery modules, solve the problem of complete fire extinguishing caused by battery thermal runaway, and improve the safety factor of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0026] Figure 2 This is one of the structural schematic diagrams of the coolant bottom plate box part of an embodiment of the present utility model;

[0027] Figure 3 This is the second structural diagram of the coolant bottom plate box part of the embodiment of the present utility model;

[0028] Figure 4 This is the third structural diagram of the coolant bottom plate box part of the embodiment of the present utility model;

[0029] Figure 5 This is a perspective schematic diagram of an embodiment of the present invention in a coolant immersion fire extinguishing state.

[0030] Among them: 1. Coolant power battery body, 2. Packaging box, 3. Battery module, 201. Battery module upper cover, 202. Coolant bottom plate box, 203. Bending slide, 204. Limit baffle, 4. Channel, 5. Fire sprinkler, 6. Coolant inlet, 7. Coolant outlet, 8. Coolant. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0032] In the description of this application, “plurality” means two or more, unless otherwise clearly defined.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0035] In some instances, methods, means, components and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of the present application.

[0036] like Figures 1 to 5 As shown, a fire extinguishing system for a cold liquid power battery is used for

[0037] A cold liquid power battery body 1, comprising a packaging box 2 and a battery module 3 arranged in the packaging box 2;

[0038] The packaging box 2 includes a semi-enclosed battery module upper cover 201 and a coolant bottom plate box 202 located at the bottom. The coolant bottom plate box 202 is a hollow structure, and plugs are welded at the front and rear ends to seal the hollow structure and form a closed cavity. The closed cavity is filled with circulating high-pressure coolant. Bending grooves 203 are set on both sides of the coolant bottom plate box 202, and the two sides of the battery module upper cover 201 are buckled with the bending grooves 203. A limiting baffle 204 is set at the end of the coolant bottom plate box 202 for limiting and positioning the installed battery module upper cover 201, so that the battery module upper cover 201 and the coolant bottom plate box 202 are combined to form a packaging box 2 that encapsulates the battery module.

[0039] A channel 4 is installed above the coolant bottom plate box 202, connecting the battery module upper cover 202 and the closed cavity. A fire sprinkler 5 is installed in the channel 4. The fire sprinkler 5 is a temperature-sensitive mechanical bursting device that does not rely on electronic components. The spray head of the fire sprinkler 5 is correspondingly arranged at a position inside the battery module upper cover 201. A coolant inlet 6 and a coolant outlet 7 are provided on the coolant bottom plate box 202. The coolant inlet 6 and the coolant outlet 7 are arranged on the outside of the battery module upper cover 202. The coolant inlet 6 and the coolant outlet 7 are connected in series to the coolant circuit. A liquid storage tank (not shown) and a circulating compression pump (not shown) are connected to the coolant circuit to keep the coolant under high pressure. The cold pressure in the closed cavity of this embodiment is 2-3 atmospheres.

[0040] The working method of this embodiment is as follows: when thermal runaway occurs in the cold liquid power battery body, the thermal runaway temperature is detected to exceed the temperature threshold of the fire sprinkler, and the fire sprinkler bursts to open a channel connecting the upper cover of the battery module and the closed cavity. The high-pressure coolant in the closed cavity is sprayed into the target battery module from the channel, and the fire is extinguished at the first time with the self-contained cooling night. The fire is extinguished from the inside of the battery module at the first time, which helps to extinguish the fire in the early stage of budding and reduce the fire hazard.

[0041] In this embodiment, a coolant inlet 6 and a coolant outlet 7 are provided on the liquid cooling base plate housing 202. The coolant is injected into the liquid cooling base plate housing 202 through the coolant inlet 6 and is discharged from the coolant outlet 7 after circulating inside the closed cavity. A fire sprinkler 5 is provided on the upper part of the liquid cooling base plate housing 202. The fire sprinkler 5 uses the water pressure of the liquid cooling internal circulation to quickly spray the coolant 8 into the battery system to extinguish the fire. Figure 5 The figure shows a perspective diagram of a coolant immersion fire extinguishing system. This embodiment utilizes the existing coolant in the cold liquid power battery as a firefighting agent, eliminating the need for additional firefighting materials and reducing costs. This embodiment also features an ingenious structural design, simple and reliable assembly of parts, and low cost. It can be triggered both actively and passively, offering high application flexibility. It can be triggered passively by temperature sensing, independent of electronic components, and can function normally under extreme conditions such as battery fires and electronic component failures. This embodiment extinguishes fires from within the battery, providing a timely temperature response and enabling normal operation even in non-sealed, non-high-pressure environments.

[0042] In other specific embodiments, the fire extinguishing system and cold liquid power battery of the present invention are used in combination with a traditional fire extinguishing system. The traditional fire extinguishing system includes a fire extinguishing tank filled with fire extinguishing agent, and a delivery pipeline and a fire valve for introducing the fire extinguishing agent into the battery body, which is used to spray and extinguish the cold liquid power battery that triggers the fire alarm. The temperature sensing threshold of the temperature sensing mechanical bursting device of the fire extinguishing system and the cold liquid power battery of this embodiment is higher than the temperature sensing threshold of the fire protection system. The fire sprinkler is normally closed. When a fire occurs in the battery system, the fire fighting gas stored in the fire protection system is discharged. If the fire is not extinguished at this time, the fire sprinkler 5 performs backup protection, and the valve of the fire sprinkler 5 bursts to open the channel. The coolant in the liquid cooling base plate box 202 is immediately sprayed out from the fire sprinkler 5 under water pressure, preventing the fire from spreading further, thereby achieving the purpose of extinguishing the fire.

[0043] This embodiment serves as a supplementary fire extinguishing system after the traditional fire extinguishing system is triggered. When the traditional fire extinguishing system fails, such as power outages in high-temperature fires, electronic device failures, or incomplete fire extinguishing and re-ignition after a fire extinguishing operation, the large amount of coolant held by the liquid storage tank and the coolant system can be transported to the thermal runaway battery pack to achieve coolant 8 immersion fire extinguishing and achieve a more thorough fire fighting purpose.

[0044] Example 2

[0045] The utility model also provides a cold liquid power battery, which includes:

[0046] A cold liquid power battery body, comprising a packaging box and a battery module arranged in the packaging box; and also comprising the fire extinguishing system of the cold liquid power battery as described above.

[0047] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fire extinguishing system for a cold liquid power battery, which is used for: A cold liquid power battery body, the cold liquid power battery body comprising a packaging box and a battery module arranged in the packaging box; Its characteristics are: The packaging box includes a battery module upper cover and a coolant bottom plate box located at the bottom, and the coolant bottom plate box and the battery module upper cover form a packaging box that encapsulates the battery module; The interior of the cooling liquid bottom plate box includes a sealed cavity, and high-pressure cooling liquid is arranged in the sealed cavity; One or more channels connecting the battery module upper cover and the sealed cavity are installed above the coolant bottom plate box, and fire sprinklers are installed in the channels; The spray port of the fire sprinkler is correspondingly arranged at a position inside the upper cover of the battery module.

2. A fire extinguishing system for a cold liquid power battery according to claim 1, characterized in that: The high-pressure coolant in the closed cavity is a circulating coolant.

3. The fire extinguishing system for a cold liquid power battery according to claim 1, characterized in that: A coolant inlet and a coolant outlet are provided on the coolant bottom plate box body, and the coolant inlet and the coolant outlet are provided on the outside of the battery module upper cover body. The coolant inlet and the coolant outlet are connected in series to the coolant circuit, and the coolant circuit is connected to a liquid storage tank and a circulating compression pump.

4. A fire extinguishing system for a cold liquid power battery according to claim 3, characterized in that: One or more battery pack modules are connected in series in the coolant circuit.

5. The fire extinguishing system for a cold liquid power battery according to claim 1, characterized in that: It includes a fire fighting system, which includes a fire extinguishing tank filled with fire extinguishing agent, a delivery pipeline for introducing the fire extinguishing agent into the battery body, and a fire fighting valve, which is used to spray and extinguish the cold liquid power battery that triggers the fire alarm.

6. A cold liquid power battery comprising: A cold liquid power battery body, the cold liquid power battery body comprising a packaging box and a battery module arranged in the packaging box; Its characteristics are: It also includes a fire extinguishing system for a cold liquid power battery as described in any one of claims 1 to 5.

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