Fire-fighting device and method for realizing automatic cooling of battery

Abstract

The invention discloses a fire-fighting device for realizing automatic cooling of a battery. The fire-fighting device comprises a battery pack and a liquid cooling pipeline, the battery pack comprises a packaging shell and a battery cell mounted in a sealed cavity of the packaging shell, and the packaging shell comprises an upper cover plate positioned above the battery cell and a bottom supporting plate positioned below the battery cell; when the temperature in the sealing cavity reaches the melting points of the first hot melting piece and the second hot melting piece due to thermal runaway of the battery cell, the first hot melting piece and the second hot melting piece are melted through, so that a liquid cooling loop between the first opening of the upper cover plate and the second opening of the bottom supporting plate is formed in the sealing cavity; the cooling liquid of the first transverse pipeline flows into the sealing cavity through the first opening of the upper cover plate, flows through the liquid cooling loop to directly cool and fire the battery cell, and then flows out of the sealing cavity through the second opening of the bottom supporting plate to flow into the second transverse pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a fire-fighting device and method for realizing automatic cooling of batteries. Background Art

[0002] The status of energy storage system in the power system is becoming increasingly prominent. With the continuous expansion of battery energy storage scale, the safety of battery packs has become a focus of attention.

[0003] Existing energy storage boxes are usually assembled from multiple battery cells into a battery box, and then the multiple battery boxes are placed in the energy storage box. When the battery cells in the energy storage box thermally run away and catch fire, if firefighting cannot be carried out in time, it will trigger thermal runaway of other lithium battery cells in the energy storage box, thereby causing a major safety accident and affecting personal safety and property safety.

[0004] At present, there are mainly two types of fire-fighting devices for thermal runaway of battery cells:

[0005] One solution is to set a detection device for each battery cell and a puncture valve installed on each of the battery packs. The puncture valve is connected to the liquid cooling pipe through a fire-fighting pipeline. When the detection device detects that the real-time temperature of the battery cell is greater than a preset temperature threshold, the puncture valve on the corresponding battery pack is used to perform targeted spraying on the battery pack to achieve fire fighting. This fire fighting solution requires additional detection devices and puncture valves for active fire fighting, which increases additional costs and space costs, and can only achieve targeted spraying for fire fighting, which is not ideal.

[0006] Another solution is to set a receiving chamber for each battery cell to hold the fire extinguishing agent. The receiving chamber is isolated from the sealed cavity where the battery cell is located by a hot melt film. When the battery cell is thermally runaway, the high temperature caused by the hot melt film melts, so that the fire extinguishing agent in the receiving chamber enters the sealed cavity where the battery cell is located to react and extinguish the fire in the battery cell. This fire fighting solution also requires the additional setting of receiving chambers and fire extinguishing agents, which increases additional costs and space costs. Moreover, if the receiving chamber is set too large, it will occupy space costs, which is not conducive to meeting the needs of miniaturization of equipment. If the receiving chamber is set too small, the fire extinguishing agent contained is insufficient, which will affect the fire fighting effect.

[0007] In addition, when implementing the present invention, the inventors found that the above two solutions in the prior art not only require additional equipment costs and space costs, but also the fire-fighting media (coolant or fire extinguishing agent) used in the two solutions are quantitative. For example, the amount of fire extinguishing agent used in Scheme 2 is determined by the size of the receiving cavity, and the amount of coolant sprayed in Scheme 1 is also pre-set (and the set amount cannot be greater than the excess space of the sealed cavity where the battery cell is located). However, the size of the fire caused by thermal runaway of the battery cell is often different, and a quantitative fire extinguishing agent or coolant cannot guarantee that it can completely extinguish the fire, thereby affecting the fire-fighting effect. Summary of the invention

[0008] The object of the present invention is to provide a fire-fighting device and method for realizing automatic cooling of batteries, which can effectively solve the above-mentioned technical problems existing in the prior art.

[0009] In order to achieve the above-mentioned object, an embodiment of the present invention provides a fire-fighting device for realizing automatic cooling of a battery, comprising a battery pack and a liquid cooling pipe; the battery pack comprises a packaging shell and a battery cell installed in a sealed cavity of the packaging shell, the packaging shell comprises an upper cover plate located above the battery cell and a bottom support plate located below the battery cell;

[0010] The liquid cooling pipe has cooling liquid flowing in it, and the liquid cooling pipe includes a first transverse pipe arranged in contact with the upper surface of the upper cover plate and a second transverse pipe arranged in contact with the lower surface of the bottom support plate, and the first transverse pipe is connected with the second transverse pipe through a longitudinal pipe to realize the circulation of cooling liquid;

[0011] The upper cover plate is provided with a first opening, the first transverse pipe is communicated with the sealed cavity through the first opening, and a first hot melt is provided on the first opening to isolate the first transverse pipe from the sealed cavity; the bottom support plate is provided with a second opening, the second transverse pipe is communicated with the sealed cavity through the second opening, and a second hot melt is sealed on the second opening to isolate the second transverse pipe from the sealed cavity; the melting points of the first hot melt and the second hot melt are lower than the melting point of the packaging shell;

[0012] When the battery cell thermal runaway causes the temperature in the sealed cavity to reach the melting points of the first hot melt component and the second hot melt component, the first hot melt component and the second hot melt component melt through, thereby forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate in the sealed cavity, and the cooling liquid in the first transverse pipe flows into the sealed cavity through the first opening of the upper cover plate, flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, and then flows out of the sealed cavity through the second opening of the bottom support plate into the second transverse pipe.

[0013] As an improvement of the above solution, the first opening of the upper cover plate and the second opening of the bottom support plate are staggered, thereby extending the liquid cooling circuit.

[0014] As an improvement of the above solution, the thickness of the first hot melt component and the second hot melt component is less than the thickness of the packaging shell; the first hot melt component and the second hot melt component are made of metal or alloy material with a low melting point.

[0015] As an improvement of the above solution, the cooling liquid is a liquid with low conductivity.

[0016] As an improvement of the above solution, the first openings include at least two, and the at least two first openings are located on the same horizontal straight line to connect the first horizontal pipe; the second openings include at least two, and the at least two second openings are located on the same horizontal straight line to connect the second horizontal pipe.

[0017] As an improvement of the above solution, the first openings include at least two, the number of the first transverse pipes is arranged corresponding to the number of the first openings, and the at least two first openings are staggered to correspond to one of the first transverse pipes respectively;

[0018] The second openings include at least two, the number of the second transverse pipes is arranged corresponding to the number of the second openings, and the at least two second openings are staggered to correspond to one second transverse pipe respectively.

[0019] In an optimized embodiment, the battery pack includes a plurality of battery packs, and the plurality of battery packs are arranged in sequence from top to bottom;

[0020] Except for the battery pack located at the bottom, the second transverse pipe in the liquid cooling pipe that is arranged on the lower surface of the bottom support plate of any battery pack also serves as the first transverse pipe that is arranged on the upper surface of the upper cover plate of the next adjacent battery pack; all the first transverse pipes and the second transverse pipes are connected through the longitudinal pipe to realize the circulation of cooling liquid.

[0021] In another optimized embodiment, the battery pack includes multiple battery packs, and the multiple battery packs are arranged in sequence from left to right; the first transverse pipe of the liquid cooling pipe is arranged to fit the upper surface of the upper cover plate of the multiple battery packs, and the second transverse pipe of the liquid cooling pipe is arranged to fit the lower surface of the bottom support plate of the multiple battery packs.

[0022] In another optimized embodiment, the battery pack includes a plurality of battery packs, and the plurality of battery packs are arranged in multiple rows from top to bottom, and each row includes at least two battery packs arranged in sequence from left to right;

[0023] In each row, the first transverse pipe of the liquid cooling pipe is arranged in contact with the upper surface of the upper cover plate of the at least two battery packs, and the second transverse pipe of the liquid cooling pipe is arranged in contact with the lower surface of the bottom support plate of the at least two battery packs;

[0024] Except for the battery packs located in the bottom row, the second transverse pipe in the liquid cooling pipe that is arranged on the lower surface of the bottom support plate of any row of battery packs also serves as the first transverse pipe that is arranged on the upper surface of the upper cover plate of the adjacent next row of battery packs; all the first transverse pipes and the second transverse pipes are connected through the longitudinal pipe to realize the circulation of cooling liquid.

[0025] Another embodiment of the present invention discloses a method for realizing automatic cooling and fire protection of a battery, comprising the steps of:

[0026] A battery pack is provided, the battery pack comprising a packaging shell and a sealed cavity installed in the packaging shell

[0027] The battery cell in the body, the packaging shell includes an upper cover plate located above the battery cell and a bottom support plate located below the battery cell, the upper cover plate is provided with a first opening, and the bottom support plate is provided with a second opening;

[0028] A liquid cooling pipe is provided, wherein a cooling liquid flows in the liquid cooling pipe, wherein the liquid cooling pipe comprises a first transverse pipe arranged in contact with the upper surface of the upper cover plate and a second transverse pipe arranged in contact with the lower surface of the bottom support plate, wherein the first transverse pipe is connected to the second transverse pipe through a longitudinal pipe to realize the circulation of the cooling liquid; the first transverse pipe is connected to the sealed cavity through the first opening, and the second transverse pipe is connected to the sealed cavity through the second opening;

[0029] Providing a first hot melt, and sealingly disposing the first hot melt on the first opening to isolate the first transverse pipe and the sealing cavity;

[0030] providing a second hot melt, and sealingly disposing the second hot melt on the second opening to isolate the second transverse pipe from the sealing cavity;

[0031] When the battery cell thermal runaway causes the temperature in the sealed cavity to reach the melting points of the first hot melt component and the second hot melt component, the first hot melt component and the second hot melt component melt through, thereby forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate in the sealed cavity, and the cooling liquid in the first transverse pipe flows into the sealed cavity through the first opening of the upper cover plate, flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, and then flows out of the sealed cavity through the second opening of the bottom support plate into the second transverse pipe.

[0032] Compared with the prior art, an embodiment of the present invention provides an automatic cooling fire-fighting device and method for a battery, the device comprising a battery pack and a liquid cooling pipe; the battery pack comprises a packaging shell and a battery cell installed in a sealed cavity of the packaging shell, the packaging shell comprises an upper cover plate located above the battery cell and a bottom support plate located below the battery cell; cooling liquid flows in the liquid cooling pipe, the liquid cooling pipe comprises a first transverse pipe arranged in contact with the upper surface of the upper cover plate and a second transverse pipe arranged in contact with the lower surface of the bottom support plate, the first transverse pipe is connected to the second transverse pipe through a longitudinal pipe to achieve the circulation of cooling liquid; a first opening is provided on the upper cover plate, the first transverse pipe is connected to the sealed cavity through the first opening, and a first hot melt is provided on the first opening to isolate the first transverse pipe from the sealed cavity; A second opening is provided on the bottom support plate, and the second transverse pipe is connected with the sealed cavity through the second opening, and a second hot melt is sealed on the second opening to isolate the second transverse pipe and the sealed cavity; the melting points of the first hot melt and the second hot melt are lower than the melting point of the packaging shell; when the thermal runaway of the battery cell causes the temperature in the sealed cavity to reach the melting points of the first hot melt and the second hot melt, the first hot melt and the second hot melt melt melt through, thereby forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate in the sealed cavity, and the cooling liquid of the first transverse pipe flows into the sealed cavity through the first opening of the upper cover plate, flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, and then flows out of the sealed cavity through the second opening of the bottom support plate into the second transverse pipe. It can be seen that the automatic cooling fire-fighting device and method for batteries provided by the present invention improves the connection structure between the battery pack and the liquid cooling pipe on the basis of the original liquid cooling pipe for cooling and heat exchange so as to utilize the cooling liquid in the liquid cooling pipe to achieve the fire-fighting effect on the thermal runaway of the battery cell without increasing the cost of additional equipment and space. In addition, by forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate inside the battery pack, when the thermal runaway of the battery cell occurs, not only can the cooling liquid continuously flow into the liquid cooling pipe through the first opening of the upper cover plate, so that it flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, but also the high-temperature liquid water after the fire can be discharged from the inside of the battery cell through the second opening of the bottom support plate, thereby improving the fire-fighting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 The present invention is a structural block diagram of a fire-fighting device for realizing automatic cooling of batteries provided by an embodiment of the present invention.

[0035] Figure 2 It is a structural schematic diagram of an automatic cooling fire fighting device for a battery provided by an embodiment of the present invention, which works when a battery cell has thermal runaway.

[0036] Figure 3 It is a structural schematic diagram of another fire-fighting device for realizing automatic cooling of batteries provided by an embodiment of the present invention.

[0037] Figure 4 It is a schematic structural diagram of another fire-fighting device for realizing automatic cooling of batteries provided by an embodiment of the present invention.

[0038] Figure 5 It is a schematic structural diagram of another fire-fighting device for realizing automatic cooling of batteries provided by an embodiment of the present invention.

[0039] Figure 6 The present invention is a flowchart of a method for realizing automatic cooling and fire protection of a battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] refer to Figure 1 The embodiment of the present invention provides a fire-fighting device 100 for realizing automatic cooling of a battery, which includes a battery pack 1 and a liquid cooling pipe 2. The battery pack 1 includes a packaging shell 11 and a battery cell 12 installed in a sealed cavity 10 of the packaging shell 11. The packaging shell 11 includes an upper cover plate 111 located above the battery cell 12 and a bottom support plate 112 located below the battery cell 12.

[0045] Cooling liquid flows in the liquid cooling pipe 2, and the liquid cooling pipe 2 includes a first transverse pipe 21 arranged in contact with the upper surface of the upper cover plate 111 and a second transverse pipe 22 arranged in contact with the lower surface of the bottom support plate 112. The first transverse pipe 21 is connected to the second transverse pipe 22 through a longitudinal pipe 23 to realize the circulation of cooling liquid.

[0046] Specific, combined Figure 1 and Figure 2 The upper cover plate 111 is provided with a first opening 1110, through which the first transverse pipe 21 is communicated with the sealed cavity 10, and the first opening 1110 is provided with a first hot melt component 1111 to isolate the first transverse pipe 21 from the sealed cavity 10. The bottom support plate 112 is provided with a second opening 1120, through which the second transverse pipe 22 is communicated with the sealed cavity 10, and the second opening 1120 is sealed with a second hot melt component 1121 to isolate the second transverse pipe 22 from the sealed cavity 10.

[0047] Among them, the melting points of the first hot melt member 1111 and the second hot melt member 1121 are lower than the melting point of the packaging shell 11. Specifically, the thickness of the first hot melt member 1111 and the second hot melt member 1121 is less than the thickness of the packaging shell 11. It can be understood that the specific thickness of the first hot melt member 1111 and the second hot melt member 1121 is not specifically limited here as long as it is guaranteed to meet the melting point requirements so that it can melt through (fuse) when the preset temperature is reached when the battery cell has thermal runaway. Similarly, the thickness of the packaging shell 11 must ensure that thermal melting through does not occur at the preset temperature. Similarly, the melting points of the first hot melt member 1111 and the second hot melt member 1121 can be set accordingly according to the fire protection requirements of the battery cell, and are not specifically limited here.

[0048] Preferably, the first hot melt member 1111 and the second hot melt member 1121 have the same melting point.

[0049] In addition, the first hot melt member 1111 and the second hot melt member 1121 are made of metal or alloy materials with a low melting point, such as tin, bismuth, indium, lead, cadmium or alloys thereof.

[0050] like Figure 1 and Figure 2 As shown, when the battery cell 12 thermally runs away and causes the temperature in the sealed cavity 10 to reach the melting points of the first hot melt member 1111 and the second hot melt member 1121, the first hot melt member 1111 and the second hot melt member 1121 melt through, thereby forming a liquid cooling loop from the first opening 1110 of the upper cover plate 111 to the second opening 1120 of the bottom support plate 112 in the sealed cavity 10 (as shown in FIG. Figure 2 (as indicated by the direction of the dashed arrow), the cooling liquid in the first transverse pipe 21 flows into the sealed cavity 10 through the first opening 1110 of the upper cover plate 111, flows through the liquid cooling circuit to directly cool and extinguish the battery cell 12, and then flows out of the sealed cavity 10 into the second transverse pipe 22 through the second opening 1120 of the bottom support plate 112.

[0051] It can be understood that in this embodiment, the liquid cooling pipe 2 can be connected to a cooling liquid supply device. The cooling liquid is a liquid with low conductivity.

[0052] like Figure 2 As shown, the first opening 1110 of the upper cover plate 111 and the second opening 1120 of the bottom support plate 112 are staggered, thereby extending the liquid cooling circuit.

[0053] As an optimization of this embodiment, the first openings 1110 include at least two, and the at least two first openings 110 are located on the same horizontal straight line to connect the first horizontal pipe 21. The second openings 1120 include at least two, and the at least two second openings 1120 are located on the same horizontal straight line to connect the second horizontal pipe 22. It can be understood that each first opening 1110 is correspondingly provided with a first hot melt member 1111, and each second opening 1120 is correspondingly provided with a second hot melt member 1121.

[0054] As another optimization of this embodiment, the first openings 1110 include at least two, the number of the first transverse pipes 21 is set corresponding to the number of the first openings 1110, and the at least two first openings 1110 are staggered to correspond to one of the first transverse pipes 21. The second openings 1120 include at least two, the number of the second transverse pipes 22 is set corresponding to the number of the second openings 1120, and the at least two second openings 1120 are staggered to correspond to one of the second transverse pipes 22. It can be understood that a first hot melt component 1111 is correspondingly arranged on each first opening 1110, and a second hot melt component 1121 is correspondingly arranged on each second opening 1120.

[0055] It is understandable that in the above two optimization schemes, the melting points of the first hot melt components 1111 disposed on each first opening 1110 may be the same or different. Similarly, the melting points of the second hot melt components 1121 disposed on each second opening 1120 may be the same or different.

[0056] refer to Figure 3 , Figure 3 2 is a schematic diagram of another fire-fighting device 200 for realizing automatic cooling of batteries provided by an embodiment of the present invention. In this embodiment, the battery pack 1 includes a plurality of battery packs 1, and the plurality of battery packs 1 are arranged in sequence from top to bottom. It can be understood that Figure 3 The battery packs 1 shown include four, but in other embodiments, the number of battery packs 1 is not limited to four, and may also be three or five, etc.

[0057] like Figure 3 As shown, except for the battery pack located at the bottom, the second transverse pipe 22 in the liquid cooling pipe 2 that is arranged to fit the lower surface of the bottom support plate 112 of any of the battery packs 1 also serves as the first transverse pipe 111 that is arranged to fit the upper surface of the upper cover plate 111 of the next adjacent battery pack 1; all the first transverse pipes 21 and the second transverse pipes 22 are connected through the longitudinal pipe 23 to realize the circulation of the cooling liquid.

[0058] exist Figure 3In the embodiment shown, when the thermal runaway of the battery cells 12 of any one or more battery packs 1 causes the temperature in the corresponding sealed cavity 10 to reach the melting point of the first hot melt member 1111 and the second hot melt member 1121, the first hot melt member 1111 and the second hot melt member 1121 melt through, thereby forming a liquid cooling circuit from the first opening 1110 of the upper cover plate 111 to the second opening 1120 of the bottom support plate 112 in the sealed cavity 10 (e.g., Figure 2 (as indicated by the direction of the dashed arrow), the cooling liquid in the first transverse pipe 21 flows into the sealed cavity 10 through the first opening 1110 of the upper cover plate 111, flows through the liquid cooling circuit to directly cool and extinguish the battery cell 12, and then flows out of the sealed cavity 10 into the second transverse pipe 22 through the second opening 1120 of the bottom support plate 112.

[0059] refer to Figure 4 , Figure 4 3 is a schematic diagram of another automatic cooling fire fighting device 300 for batteries provided by an embodiment of the present invention. In this embodiment, the battery pack 1 includes a plurality of battery packs, which are arranged in sequence from left to right. It can be understood that Figure 4 The battery packs 1 shown include three, but in other embodiments, the number of battery packs 1 is not limited to three, and may also be four or five, etc.

[0060] like Figure 4 As shown, the first transverse pipe 21 of the liquid cooling pipe 2 is arranged to fit the upper surface of the upper cover plate 111 of the multiple battery packs 1, and the second transverse pipe 22 of the liquid cooling pipe 2 is arranged to fit the lower surface of the bottom support plate 112 of the multiple battery packs 1.

[0061] exist Figure 4 In the embodiment shown, when the thermal runaway of the battery cells 12 of any one or more battery packs 1 causes the temperature in the corresponding sealed cavity 10 to reach the melting point of the first hot melt member 1111 and the second hot melt member 1121, the first hot melt member 1111 and the second hot melt member 1121 melt through, thereby forming a liquid cooling circuit from the first opening 1110 of the upper cover plate 111 to the second opening 1120 of the bottom support plate 112 in the sealed cavity 10 (e.g., Figure 2 (as indicated by the direction of the dashed arrow), the cooling liquid in the first transverse pipe 21 flows into the sealed cavity 10 through the first opening 1110 of the upper cover plate 111, flows through the liquid cooling circuit to directly cool and extinguish the battery cell 12, and then flows out of the sealed cavity 10 into the second transverse pipe 22 through the second opening 1120 of the bottom support plate 112.

[0062] refer to Figure 5 , Figure 54 is a schematic diagram of another fire-fighting device 400 for realizing automatic cooling of batteries provided by an embodiment of the present invention. The battery pack 1 includes a plurality of battery packs 1, which are arranged in multiple rows from top to bottom, and each row includes at least two battery packs 1 arranged in sequence from left to right. It can be understood that Figure 5 The battery packs 1 shown include 9 batteries, which are arranged in 3 rows from top to bottom, with 3 batteries arranged in each row from left to right. However, in other embodiments, the number of battery packs 1 is not limited to 9, and may also be 12 or 15, etc.

[0063] like Figure 5 As shown, in each row, the first transverse pipe 21 of the liquid cooling pipe 2 is arranged to fit the upper surface of the upper cover plate 111 of the at least two battery packs 1, and the second transverse pipe 22 of the liquid cooling pipe 2 is arranged to fit the lower surface of the bottom support plate 112 of the at least two battery packs 1.

[0064] Except for the battery packs located in the bottom row, the second transverse pipe 22 in the liquid cooling pipe 2 that is arranged on the lower surface of the bottom support plate 112 of any row of battery packs 1 also serves as the first transverse pipe 11 that is arranged on the upper surface of the upper cover plate 111 of the adjacent next row of battery packs 1; all the first transverse pipes 21 and the second transverse pipes 22 are connected through the longitudinal pipe 23 to realize the circulation of cooling liquid.

[0065] exist Figure 5 In the embodiment shown, when the thermal runaway of the battery cells 12 of any one or more battery packs 1 causes the temperature in the corresponding sealed cavity 10 to reach the melting point of the first hot melt member 1111 and the second hot melt member 1121, the first hot melt member 1111 and the second hot melt member 1121 melt through, thereby forming a liquid cooling circuit from the first opening 1110 of the upper cover plate 111 to the second opening 1120 of the bottom support plate 112 in the sealed cavity 10 (e.g., Figure 2 (as indicated by the direction of the dashed arrow), the cooling liquid in the first transverse pipe 21 flows into the sealed cavity 10 through the first opening 1110 of the upper cover plate 111, flows through the liquid cooling circuit to directly cool and extinguish the battery cell 12, and then flows out of the sealed cavity 10 into the second transverse pipe 22 through the second opening 1120 of the bottom support plate 112.

[0066] refer to Figure 6 This embodiment provides a method for realizing automatic cooling and fire protection of a battery, comprising the steps of:

[0067] S1. Provide a battery pack, the battery pack comprising a packaging shell and a battery cell installed in a sealed cavity of the packaging shell, the packaging shell comprising an upper cover plate located above the battery cell and a bottom support plate located below the battery cell, the upper cover plate being provided with a first opening, and the bottom support plate being provided with a second opening;

[0068] S2. Provide a liquid cooling pipeline, wherein cooling liquid flows in the liquid cooling pipeline, wherein the liquid cooling pipeline comprises a first transverse pipeline arranged in contact with the upper surface of the upper cover plate and a second transverse pipeline arranged in contact with the lower surface of the bottom support plate, wherein the first transverse pipeline is connected to the second transverse pipeline via a longitudinal pipeline to realize the circulation of cooling liquid; the first transverse pipeline is connected to the sealed cavity via the first opening, and the second transverse pipeline is connected to the sealed cavity via the second opening;

[0069] S3, providing a first hot melt component, and sealingly disposing the first hot melt component on the first opening to isolate the first transverse pipe and the sealing cavity;

[0070] S4, providing a second hot melt component, and sealingly disposing the second hot melt component on the second opening to isolate the second transverse pipe and the sealing cavity;

[0071] S5. When the battery cell thermal runaway causes the temperature in the sealed cavity to reach the melting points of the first hot melt component and the second hot melt component, the first hot melt component and the second hot melt component melt through, thereby forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate in the sealed cavity, and the cooling liquid in the first transverse pipe flows into the sealed cavity through the first opening of the upper cover plate, flows through the liquid cooling circuit to directly cool down and extinguish the battery cell, and then flows out of the sealed cavity through the second opening of the bottom support plate into the second transverse pipe.

[0072] It can be understood that the specific implementation process and working principle of the automatic cooling fire protection method for batteries provided in this embodiment can be referred to Figure 1 to Figure 5 The relevant processes and principles of the automatic cooling fire fighting device for batteries provided in the different embodiments are not described in detail here.

[0073] In summary, the automatic cooling fire-fighting device and method for batteries provided by the present invention improves the connection structure between the battery pack and the liquid cooling pipe on the basis of the original liquid cooling pipe used for cooling and heat exchange so as to utilize the cooling liquid in the liquid cooling pipe to achieve the fire-fighting effect on the thermal runaway of the battery cell without increasing the cost of additional equipment and space. In addition, by forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate inside the battery pack, when the thermal runaway of the battery cell occurs, not only can the cooling liquid continuously flow into the liquid cooling pipe through the first opening of the upper cover plate, so that it flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, but also the high-temperature liquid water after the fire can be discharged from the inside of the battery cell through the second opening of the bottom support plate, thereby improving the fire-fighting effect.

[0074] The above disclosures are only some preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims

1. A fire-fighting device for realizing automatic cooling of batteries, characterized in that: The invention comprises a battery pack and a liquid cooling pipe; the battery pack comprises a packaging shell and a battery cell installed in a sealed cavity of the packaging shell, and the packaging shell comprises an upper cover plate located above the battery cell and a bottom support plate located below the battery cell; The liquid cooling pipe has cooling liquid flowing in it, and the liquid cooling pipe includes a first transverse pipe arranged in contact with the upper surface of the upper cover plate and a second transverse pipe arranged in contact with the lower surface of the bottom support plate, and the first transverse pipe is connected with the second transverse pipe through a longitudinal pipe to realize the circulation of cooling liquid; The upper cover plate is provided with a first opening, the first transverse pipe is communicated with the sealed cavity through the first opening, and a first hot melt is provided on the first opening to isolate the first transverse pipe from the sealed cavity; the bottom support plate is provided with a second opening, the second transverse pipe is communicated with the sealed cavity through the second opening, and a second hot melt is sealed on the second opening to isolate the second transverse pipe from the sealed cavity; the melting points of the first hot melt and the second hot melt are lower than the melting point of the packaging shell; When the battery cell thermal runaway causes the temperature in the sealed cavity to reach the melting points of the first hot melt component and the second hot melt component, the first hot melt component and the second hot melt component melt through, thereby forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate in the sealed cavity, and the cooling liquid in the first transverse pipe flows into the sealed cavity through the first opening of the upper cover plate, flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, and then flows out of the sealed cavity through the second opening of the bottom support plate into the second transverse pipe.

2. The fire-fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The first opening of the upper cover plate and the second opening of the bottom support plate are arranged in an offset manner, thereby extending the liquid cooling circuit.

3. The fire-fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The thickness of the first hot melt component and the second hot melt component is smaller than the thickness of the packaging shell; the first hot melt component and the second hot melt component are made of metal or alloy material with a low melting point.

4. The fire-fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The cooling liquid is a liquid with low electrical conductivity.

5. The fire-fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The first openings include at least two, and the at least two first openings are located on the same transverse straight line to connect to the first transverse pipe; the second openings include at least two, and the at least two second openings are located on the same transverse straight line to connect to the second transverse pipe.

6. The fire-fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The first openings include at least two, the number of the first transverse pipes is set corresponding to the number of the first openings, and the at least two first openings are staggered to correspond to one of the first transverse pipes respectively; the second openings include at least two, the number of the second transverse pipes is set corresponding to the number of the second openings, and the at least two second openings are staggered to correspond to one of the second transverse pipes respectively.

7. The fire-fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The battery pack includes a plurality of battery packs, and the plurality of battery packs are arranged in sequence from top to bottom; Except for the battery pack located at the bottom, the second transverse pipe in the liquid cooling pipe that is arranged on the lower surface of the bottom support plate of any battery pack also serves as the first transverse pipe that is arranged on the upper surface of the upper cover plate of the next adjacent battery pack; all the first transverse pipes and the second transverse pipes are connected through the longitudinal pipe to realize the circulation of cooling liquid.

8. The fire fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The battery packs include multiple battery packs, which are arranged in sequence from left to right; the first transverse pipe of the liquid cooling pipe is arranged to fit the upper surface of the upper cover plate of the multiple battery packs, and the second transverse pipe of the liquid cooling pipe is arranged to fit the lower surface of the bottom support plate of the multiple battery packs.

9. The fire fighting device for realizing automatic cooling of batteries according to claim 1, characterized in that: The battery packs include a plurality of battery packs, which are arranged in a plurality of rows from top to bottom, and each row includes at least two battery packs which are arranged in a plurality of rows from left to right; In each row, the first transverse pipe of the liquid cooling pipe is arranged in contact with the upper surface of the upper cover plate of the at least two battery packs, and the second transverse pipe of the liquid cooling pipe is arranged in contact with the lower surface of the bottom support plate of the at least two battery packs; Except for the battery packs located in the bottom row, the second transverse pipe in the liquid cooling pipe that is arranged on the lower surface of the bottom support plate of any row of battery packs also serves as the first transverse pipe that is arranged on the upper surface of the upper cover plate of the adjacent next row of battery packs; all the first transverse pipes and the second transverse pipes are connected through the longitudinal pipe to realize the circulation of cooling liquid.

10. A method for realizing automatic cooling and fire fighting of batteries, characterized in that: Includes steps: A battery pack is provided, the battery pack comprising a packaging shell and a battery cell installed in a sealed cavity of the packaging shell, the packaging shell comprising an upper cover plate located above the battery cell and a bottom support plate located below the battery cell, the upper cover plate is provided with a first opening, and the bottom support plate is provided with a second opening; A liquid cooling pipe is provided, wherein a cooling liquid flows in the liquid cooling pipe, wherein the liquid cooling pipe comprises a first transverse pipe arranged in contact with the upper surface of the upper cover plate and a second transverse pipe arranged in contact with the lower surface of the bottom support plate, wherein the first transverse pipe is connected to the second transverse pipe through a longitudinal pipe to realize the circulation of the cooling liquid; the first transverse pipe is connected to the sealed cavity through the first opening, and the second transverse pipe is connected to the sealed cavity through the second opening; Providing a first hot melt, and sealingly disposing the first hot melt on the first opening to isolate the first transverse pipe and the sealing cavity; providing a second hot melt, and sealingly disposing the second hot melt on the second opening to isolate the second transverse pipe from the sealing cavity; When the battery cell thermal runaway causes the temperature in the sealed cavity to reach the melting points of the first hot melt component and the second hot melt component, the first hot melt component and the second hot melt component melt through, thereby forming a liquid cooling circuit from the first opening of the upper cover plate to the second opening of the bottom support plate in the sealed cavity, and the cooling liquid in the first transverse pipe flows into the sealed cavity through the first opening of the upper cover plate, flows through the liquid cooling circuit to directly cool the battery cell and extinguish the fire, and then flows out of the sealed cavity through the second opening of the bottom support plate into the second transverse pipe.

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