Battery pack

Abstract

A battery pack (100), comprising a housing (10), at least two battery cells (20), and a cooling assembly (30), wherein the at least two battery cells (20) are arranged in the housing (10) and spaced apart in a first direction; the cooling assembly (30) comprises a connector (31), a cooling pipe (32), a heat dissipation plate (33), a reversing member (34), and a fire-fighting pipe (35); the connector (31) passes through and is fixed on the housing (10), the cooling pipe (32) is connected to the connector (31), the heat dissipation plate (33) is connected to the cooling pipe (32), the heat dissipation plate (33) is arranged between two adjacent battery cells (20), the reversing member (34) is mounted on the cooling pipe (32), and the fire-fighting pipe (35) is connected to the reversing member (34). The connector (31) is in communication with either the cooling pipe (32) or the fire-fighting pipe (35), and the communication state of the connector (31) is switched by means of the reversing member (34). By providing the fire-fighting pipe (35) on the cooling assembly (30), when a fire breaks out, the fire-fighting pipe (35) is in communication with the connector (31) by means of the reversing member (34), so that a fire-fighting medium can be directly introduced into the housing (10), enabling the fire-fighting medium to directly come into contact with the battery cells (20), extinguishing the source of the fire inside the battery pack (100), effectively controlling the spread of the fire, and improving the safety of the battery pack (100) during use.

Description

battery pack Technical Field

[0001] The utility model relates to the technical field of ship power batteries, in particular to a battery pack. Background Art

[0002] Shipbuilding plays a significant role in driving the development and export expansion of key industries such as steel, petrochemicals, textiles, equipment manufacturing, and electronics and information technology. It is a crucial pillar in China's implementation of its strategies to build a strong maritime and manufacturing nation. However, traditional ship propulsion systems, such as diesel engines, steam turbines, and gas turbines, consume diesel to generate power and suffer from major issues: low fuel-energy conversion efficiency, high vibration and noise levels, and exhaust emissions that pollute the ecological environment. Therefore, research into clean, efficient, and sustainable new energy propulsion technologies has become a key development direction for green shipping. As the core of green power energy in the 21st century, power batteries have become a key technological focus for green shipping. However, the requirements for power batteries in the marine sector differ from those in other terrestrial sectors, such as the automotive sector. The consequences of thermal runaway on a ship are significantly more severe than on land, necessitating much higher safety requirements for marine power batteries than on land, necessitating enhanced thermal runaway protection measures.

[0003] Existing power batteries can experience thermal runaway and fires due to improper use, prolonged overload operation, or impact that damages the battery cells and shorts the positive and negative electrodes. If a power battery fire occurs, existing fire extinguishing methods rely on external spraying of extinguishing media, such as fire extinguishers or high-pressure water guns. However, external spraying of extinguishing media on power batteries cannot directly reach the burning battery cells, effectively extinguishing the fire. This poses a safety hazard and compromises the safety of power batteries.

[0004] Utility Model Content

[0005] The technical problems to be solved by the utility model are:

[0006] After the power battery catches fire, it is impossible to effectively extinguish the fire, resulting in poor safety.

[0007] In order to solve the above technical problems, the present invention provides a battery pack, comprising:

[0008] a housing, wherein a receiving cavity is provided in the housing;

[0009] At least two battery cells; the battery cells are arranged in the accommodating cavity at intervals along a first direction;

[0010] A cooling assembly is installed in the accommodating cavity; the cooling assembly includes a joint, a cooling pipe, a heat sink, a reversing member, and a fire hose; the joint is passed through and fixed to the housing, the cooling pipe is connected to the joint, the heat sink is connected to the cooling pipe, the heat sink is arranged between two adjacent battery cells, the reversing member is installed on the cooling pipe, and the fire hose is connected to the reversing member;

[0011] The cooling pipe extends in a first direction, the fire-fighting pipe extends in a second direction, the joint is connected to the cooling pipe or the fire-fighting pipe, and the connection state of the joint is switched by the reversing member.

[0012] In one embodiment, the heat dissipation plate is provided with an inlet hole, a cavity and a heat dissipation channel; the inlet hole is connected to the interior of the cooling tube, the cavity is connected to the inlet hole, the heat dissipation channel is connected to the cavity, and the heat dissipation channel corresponds to the setting position of the battery cell.

[0013] In one embodiment, the heat dissipation channel is in the shape of an elongated strip extending along the third direction, at least two heat dissipation channels are provided, and the heat dissipation channels are arranged in the heat dissipation plate at intervals along the second direction, and each heat dissipation channel is connected to the chamber.

[0014] In one embodiment, one end of the heat dissipation channel is communicated with the chamber, and the other end of the heat dissipation channel passes through the heat dissipation plate to be communicated with the accommodating cavity.

[0015] In one embodiment, the cross-section of the chamber along the direction perpendicular to the first direction is triangular, and the inlet hole and the heat dissipation channel are arranged on opposite sides of the chamber in the third direction;

[0016] Two opposite side surfaces of the chamber in the second direction expand and extend gradually away from each other along the inlet hole toward the heat dissipation channel.

[0017] In one embodiment, the fire-fighting pipe includes an upright portion and a nozzle head; one end of the upright portion is connected to the reversing member, the upright portion extends along the second direction, the nozzle head is arranged at one end of the upright portion away from the reversing member, and the nozzle head extends from the upright portion toward the direction close to the battery cell.

[0018] In one embodiment, the cross-sectional dimension of the shower head gradually decreases from the upright portion toward the battery cell.

[0019] In one embodiment, the battery pack further includes a fixing seat; two fixing seats are arranged in the accommodating cavity at intervals along the first direction, and each of the battery cells is arranged between the two fixing seats and is clamped and fixed by the two fixing seats.

[0020] In one embodiment, the housing includes a bottom shell and a top cover; the top cover is connected to the bottom shell and surrounds the accommodating cavity;

[0021] A sealing gasket is provided between the bottom shell and the top cover.

[0022] In one embodiment, a rubber ring is provided between the cooling tube and the heat dissipation plate.

[0023] Compared with the prior art, the above battery pack has the following advantages:

[0024] By arranging a fire-fighting pipe on the cooling assembly, when a fire occurs, the fire-fighting pipe is connected to the joint through the reversing piece, so that the fire-fighting medium can be directly introduced into the shell, so that the fire-fighting medium can directly contact the battery cell, thereby realizing fire-fighting treatment from inside the battery pack, directly extinguishing the fire source, effectively controlling the development of the fire, and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

[0026] FIG2 is a schematic diagram of the structure of FIG1 after the housing is hidden;

[0027] FIG3 is a schematic diagram of the exploded structure of the battery pack in FIG1 ;

[0028] FIG4 is an enlarged schematic diagram of the circle A portion in FIG3 ;

[0029] FIG5 is a schematic structural diagram of the heat dissipation plate in FIG3 .

[0030] The meanings of the numbers in the accompanying drawings are: 100, battery pack; 10, shell; 11, bottom shell; 12, top cover; 13, sealing gasket; 15, accommodating chamber; 16, air outlet; 20, battery cell; 30, cooling assembly; 31, connector; 32, cooling pipe; 33, heat sink; 331, inlet hole; 332, chamber; 333, heat dissipation channel; 34, reversing member; 35, fire hose; 351, upright portion; 352, nozzle head; 36, rubber ring; 40, fixing seat. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] 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", "axial", "radial", "circumferential" and the like to 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0037] It should be noted that, as shown in Figures 2 and 3, in the embodiment of the present invention, the X-axis direction, the Y-axis direction, and the Z-axis direction intersect each other. For ease of explanation, the first direction is defined as the X-axis direction, the second direction is defined as the Y-axis direction, and the third direction is defined as the Z-axis direction. In this embodiment, the X-axis direction and the Y-axis direction are coplanar and perpendicular to each other, and the Z-axis direction is perpendicular to the common plane of the X-axis and the Y-axis. The first direction, the second direction, and the third direction are perpendicular to each other. It should be further explained that the definition of vertical in the specification should be understood as vertical within a 90-degree fluctuation of 10%, that is, the angle between the defined first direction and the second direction should be understood as vertical if it is between 80 degrees and 90 degrees.

[0038] Referring to Figures 1 to 5 , a battery pack 100 according to one embodiment of the present invention is shown, comprising a housing 10, battery cells 20, and a cooling assembly 30. The housing 10 includes a housing 15 to accommodate and protect other components. There are at least two battery cells 20, spaced apart along a first direction within the housing 15. These cells 20 are core components for converting chemical energy into electrical energy, thereby providing external power. The cooling assembly 30 is installed in the accommodating cavity 15; the cooling assembly 30 includes a joint 31, a cooling pipe 32, a heat sink 33, a reversing member 34 and a fire hose 35; the joint 31 is passed through and fixed on the shell 10, the cooling pipe 32 is connected to the joint 31, the heat sink 33 is connected to the cooling pipe 32, and the heat sink 33 is arranged between two adjacent battery cells 20. The heat sink 33 is used to exchange heat with the battery cells 20, thereby realizing a cooling operation on the battery cells 20; the reversing member 34 is installed on the cooling pipe 32, and the fire hose 35 is connected to the reversing member 34; wherein, the cooling pipe 32 extends along a first direction, the fire hose 35 extends along a second direction, the joint 31 is connected to the cooling pipe 32 or the fire hose 35, and the connection state of the joint 31 is switched by the reversing member 34.

[0039] Furthermore, the shell 10 is arranged in a hollow structure, and a relatively closed accommodating chamber 15 is formed inside the shell 10, and the shell 10 protects the internal components. In this embodiment, the shell 10 includes a bottom shell 11 and a top cover 12. The bottom shell 11 is arranged at the bottom of the shell 10, and the top cover 12 is arranged at the top of the shell 10. The top cover 12 is connected to the bottom shell 11, and the openings on the bottom shell 11 and the top cover 12 are opposite to each other, and the top cover 12 and the bottom shell 11 are surrounded to form the accommodating chamber 15. It can be understood that the top cover 12 and the bottom shell 11 can be fixed by bolts, welding or snap fastening or other fixing methods. The connection and fixing method of the top cover 12 and the bottom shell 11 is not limited here, and it is sufficient to ensure that the top cover 12 and the bottom shell 11 can be connected to each other to form the accommodating chamber 15.

[0040] Furthermore, a sealing gasket 13 is disposed between the bottom shell 11 and the top cover 12. This sealing gasket 13 is annular and is clamped between the bottom shell 11 and the top cover 12. It extends along the periphery of the open end of the bottom shell 11 and is used to seal the connection between the bottom shell 11 and the top cover 12, thereby improving the airtightness of the housing 10. It is understood that this sealing gasket 13 can be made of plastic, silicone, polytetrafluoroethylene, or other materials. The specific material of the sealing gasket 13 is not limited herein; it is sufficient to ensure that the sealing gasket 13 can seal the connection between the bottom shell 11 and the top cover 12.

[0041] Furthermore, the battery cells 20 are generally rectangular in shape and are spaced apart along a first direction within the accommodating cavity 15. The battery cells 20 are used to generate electrical energy. By connecting the battery cells 20 in series, parallel, or a combination thereof as needed, the battery pack 100 can output the required power, thereby providing external power. The battery cells 20 are provided with positive and negative poles to ensure external power output. The positive and negative poles of each battery cell 20 are located on the side of the battery cell 20 near the top cover 12 to facilitate assembly.

[0042] Furthermore, the cooling assembly 30 is connected to an external air supply or liquid supply device to achieve air cooling or water cooling of the battery cell 20. The specific cooling method is not limited here. In the present embodiment, the cooling assembly 30 is connected to an external air supply device, and the external air supply device inputs a high-pressure airflow to the cooling assembly 30. The space of the high-pressure airflow in the heat sink 33 becomes larger, and the air pressure decreases. The airflow absorbs heat during the pressure reduction process, thereby improving the heat dissipation effect of the air cooling. Furthermore, in the event of thermal runaway of the battery cell 20, the external air supply device will pass a flame retardant medium into the cooling assembly 30, and enter the accommodating cavity 15 through the fire hose 35 to achieve control of the thermal runaway situation. The flame retardant medium is other flame retardant media such as carbon dioxide, nitrogen or heptafluoropropane. When the battery cell 20 is working normally, the external air supply device can pass air into the cooling assembly 30 to reduce the cooling cost of the battery cell 20. Of course, when the battery cell 20 is operating normally, an external gas supply device may also introduce a gas cooling medium with a specific composition ratio to improve the heat dissipation effect of the cooling assembly 30 .

[0043] Furthermore, the connector 31 is passed through the bottom shell 11, one end of the connector 31 is arranged in the accommodating cavity 15, and the other end of the connector 31 is arranged on the outside of the shell 10. The end of the connector 31 arranged in the accommodating cavity 15 is connected to the cooling pipe 32, and the end of the connector 31 arranged on the outside of the shell 10 is connected to the external air supply device. The connector 31 is used to connect to the external air supply device to pass the cooling medium or flame retardant medium into the cooling component 30.

[0044] Furthermore, the cooling pipe 32 is extended in the shape of an elongated strip, and the cooling pipe 32 is extended in the first direction, and the end of the cooling pipe 32 is connected to the joint 31. It is understandable that the cooling pipe 32 can also be of other irregular shapes. The specific shape of the cooling pipe 32 is not limited here, and it is sufficient to ensure that the cooling pipe 32 can be connected to each heat sink 33 in sequence. In this embodiment, the cooling pipe 32 is in the shape of a rectangular strip, and the cooling pipe 32 is connected and fixed to the shell 10. The cubic shape of the cooling pipe 32 can improve the stability of the connection between the cooling pipe 32 and the shell 10, and can better connect and fix the cooling pipe 32 to the heat sink 33. A circular elongated flow channel is provided in the cooling pipe 32 to transport the cooling medium transported by the joint 31.

[0045] Furthermore, the heat sink 33 is arranged in a straight plate structure, and the heat sink 33 is arranged between two adjacent battery cells 20. The extension plane of the heat sink 33 is perpendicular to the extension direction of the cooling tube 32. The heat sink 33 and the battery cells 20 are arranged side by side. The heat sink 33 fits the battery cells 20 on both sides in the first direction to improve the heat exchange efficiency and the heat dissipation effect. It can be understood that in other embodiments, in order to ensure the stability of the heat sink 33 and the battery cells 20, thermal conductive silicone will be installed between the heat sink 33 and the battery cells 20 to ensure that the heat sink 33 and the battery cells 20 are tightly fitted, thereby improving the thermal conductivity between the heat sink 33 and the battery cells 20. In this embodiment, the number of heat sinks 33 is multiple, and the heat sinks 33 are arranged in parallel and spaced apart along the first direction. Each heat sink 33 is connected to the cooling tube 32, and the cooling tube 32 inputs the cooling medium into each heat sink 33. In this embodiment, a rubber ring 36 is provided between the heat sink 33 and the cooling tube 32 . The rubber ring 36 is provided in a ring-shaped structure and is used to seal the joint between the heat sink 33 and the cooling tube 32 .

[0046] Furthermore, the heat sink 33 is provided with an inlet hole 331, a chamber 332 and a heat dissipation channel 333. The inlet hole 331 is connected to the interior of the cooling tube 32, and the inlet hole 331 is in the shape of an elongated strip. The inlet hole 331 is used to introduce the cooling medium into the chamber 332. The chamber 332 is connected to the inlet hole 331, and the inlet hole 331 and the heat dissipation channel 333 are respectively arranged on both sides of the chamber 332 in the third direction. The heat dissipation channel 333 is connected to the chamber 332, and the heat dissipation channel 333 is in the shape of an elongated strip extending along the third direction. The heat dissipation channel 333 corresponds to the setting position of the battery cell 20. The cooling medium in the heat dissipation channel 333 absorbs the heat generated by the battery cell 20 during operation and transports it to the outside to achieve cooling operation of the battery cell 20. In this embodiment, at least two heat dissipation channels 333 are provided, and the heat dissipation channels 333 are arranged at intervals along the second direction in the heat dissipation plate 33. Each heat dissipation channel 333 is connected to the chamber 332. By providing multiple heat dissipation channels 333, the heat dissipation area can be increased, and the gas in each heat dissipation channel 333 can be ensured to be relatively independent flow channels, thereby avoiding turbulence caused by the cooling medium absorbing different heat at different positions, thereby improving the heat dissipation effect of the battery cell 20.

[0047] Furthermore, one end of the heat dissipation channel 333 is connected to the chamber 332, and the other end of the heat dissipation channel 333 passes through the heat sink 33 to be connected to the accommodating chamber 15, that is, the cooling medium in the heat dissipation channel 333 will pass into the accommodating chamber 15. Specifically, the shell 10 is provided with an air outlet 16, and the air outlet 16 is provided on the top cover 12. The air outlet 16 is connected to the external air pipe to discharge the cooling medium in the accommodating chamber 15. By passing the cooling medium in the heat dissipation channel 333 into the chamber 332 and then discharging it together, the cooling medium entering the chamber 332 can absorb the heat from the exposed side of the battery cell 20, thereby avoiding heat dissipation only on the side of the battery cell 20 that is in contact with the heat sink 33, thereby improving the heat dissipation effect of the battery cell 20.

[0048] Furthermore, the cross-section of the chamber 332, perpendicular to the first direction, is triangular. Opposite sides of the chamber 332 in the second direction gradually diverge from each other along the inlet hole 331 toward the heat dissipation channels 333. This means that as the cooling medium enters the chamber 332 from the inlet hole 331, it gradually diffuses toward both sides in the second direction. The greater the pressure exerted on the cooling medium by the side faces, the more evenly the cooling medium is distributed across the heat dissipation channels 333 in the second direction, improving heat dissipation performance.

[0049] Furthermore, the reversing member 34 is provided on the cooling pipe 32, and is installed at one end of the cooling pipe 32 near the connector 31. The reversing member 34 is used to adjust the connection between the cooling pipe 32 and the fire hose 35. In this embodiment, the reversing member 34 is a three-way solenoid valve.

[0050] Furthermore, the fire hose 35 includes an upright portion 351 and a nozzle head 352. One end of the upright portion 351 is connected to the reversing member 34. The upright portion 351 is elongated and extends along the second direction, with the bottom of the upright portion 351 connected to the reversing member 34. The nozzle head 352 is located at the end of the upright portion 351 away from the reversing member 34 and extends from the upright portion 351 toward the battery cell 20. When thermal runaway occurs in the battery cell 20, the reversing member 34 connects the fire hose 35 with the connector 31, and an external air supply device introduces a flame-retardant medium into the fire hose 35. The flame-retardant medium is then sprayed toward the battery cell 20 through the nozzle head 352. In this embodiment, the cross-sectional dimensions of the nozzle head 352 gradually decrease from the upright portion 351 toward the battery cell 20 to increase the spray pressure and flow rate of the flame-retardant medium, thereby increasing the coverage area and ensuring effective control of thermal runaway. Furthermore, a plurality of nozzle heads 352 may be provided on the same fire hose 35 , with each nozzle head 352 facing a different direction, so as to increase the area covered by the spray of the flame retardant medium, thereby improving the control effect on thermal runaway.

[0051] Furthermore, the battery pack 100 also includes a fixing base 40. There are two fixing bases 40, which are arranged in the accommodating cavity 15 at intervals along the first direction. The fixing bases 40 are straight plate-shaped and extend in the same direction. Each battery cell 20 is arranged between the two fixing bases 40 and is clamped and fixed by the two fixing bases 40. The two fixing bases 40 apply a clamping force along the first direction to the battery cell 20, fixing the battery cell 20 and ensuring that the battery cell 20 is in contact with the heat sink 33 to ensure heat dissipation.

[0052] The working process of the present invention is as follows: during normal operation, the reversing member 34 connects the cooling pipe 32 with the joint 31. At this time, the external air supply component passes the cooling medium into the cooling pipe 32. The cooling medium is high-pressure gas. The cooling medium enters each heat dissipation plate 33 through the cooling pipe 32 and is evenly passed into each heat dissipation channel 333 through the chamber 332. The cooling medium absorbs the heat generated by the battery cell 20 in the heat dissipation channel 333, then enters the accommodating cavity 15, and dissipates heat to other exposed outer walls of the battery cell 20. Finally, the cooling medium is discharged to the outside through the air outlet 16 to realize the cooling operation of the battery cell 20. When thermal runaway of the battery cell 20 occurs, the reversing member 34 connects the fire hose 35 with the connector 31, and the external gas supply assembly converts the incoming gas from a cooling medium to a flame retardant medium. The flame retardant medium enters the fire hose 35 through the connector 31 and the reversing member 34, and is sprayed toward the battery cell 20 through the nozzle head 352, separating the fire source from the oxygen to control the thermal runaway and prevent the battery cell 20 from continuing to burn.

[0053] In summary, the present invention provides a battery pack 100, which has the following beneficial effects:

[0054] By arranging a fire-fighting pipe 35 on the cooling assembly 30, when a fire occurs, the fire-fighting pipe 35 is connected to the connector 31 through the reversing member 34, so that the fire-fighting medium can be directly introduced into the shell 10, so that the fire-fighting medium can directly contact the battery cell 20, thereby achieving fire extinguishing from the fire source inside the battery pack 100, effectively controlling the development of the fire, and improving the safety of the battery pack 100.

[0055] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A housing having a receiving cavity disposed therein; At least two battery cells; the battery cells are arranged in the accommodating cavity at intervals along a first direction; A cooling assembly is installed in the accommodating cavity; the cooling assembly includes a joint, a cooling pipe, a heat sink, a commutator and a fire hose; the joint is passed through and fixed on the shell, the cooling pipe is connected to the joint, the heat sink is connected to the cooling pipe, the heat sink is arranged between two adjacent battery cells, the commutator is installed on the cooling pipe, and the fire hose is connected to the commutator; The cooling pipe extends in a first direction, the fire-fighting pipe extends in a second direction, the joint is connected to the cooling pipe or the fire-fighting pipe, and the connection state of the joint is switched by the reversing member.

2. The battery pack according to claim 1, characterized in that: The heat sink is provided with an inlet hole, a chamber and a heat dissipation channel; the inlet hole is connected with the interior of the cooling tube, the chamber is connected with the inlet hole, the heat dissipation channel is connected with the chamber, and the heat dissipation channel corresponds to the setting position of the battery cell.

3. The battery pack according to claim 2, characterized in that: The heat dissipation channel is in a strip shape and extends along the third direction. At least two heat dissipation channels are provided. The heat dissipation channels are arranged in the heat dissipation plate at intervals along the second direction. Each of the heat dissipation channels is connected to the chamber.

4. The battery pack according to claim 3, characterized in that: One end of the heat dissipation channel is communicated with the chamber, and the other end of the heat dissipation channel passes through the heat dissipation plate to be communicated with the accommodating cavity.

5. The battery pack according to claim 2, characterized in that: The cross-section of the chamber along the direction perpendicular to the first direction is triangular, and the inlet hole and the heat dissipation channel are arranged on two opposite sides of the chamber in the third direction; Two opposite side surfaces of the chamber in the second direction expand and extend in a gradually diverging shape along the introduction hole toward the heat dissipation channel.

6. The battery pack according to claim 1, characterized in that: The fire-fighting pipe includes an upright portion and a nozzle head; one end of the upright portion is connected to the reversing member, the upright portion is extended along the second direction, the nozzle head is arranged at one end of the upright portion away from the reversing member, and the nozzle head extends from the upright portion toward the direction close to the battery cell.

7. The battery pack according to claim 6, characterized in that: The cross-sectional dimension of the nozzle head gradually decreases from the upright portion toward the battery core.

8. The battery pack according to claim 1, characterized in that: The battery pack also includes a fixing seat; two fixing seats are arranged in the accommodating cavity at intervals along the first direction, and each of the battery cells is arranged between the two fixing seats and is clamped and fixed by the two fixing seats.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The housing comprises a bottom shell and a top cover; the top cover is connected to the bottom shell and surrounds the accommodating cavity; A sealing gasket is arranged between the bottom shell and the top cover.

10. The battery pack according to any one of claims 1 to 8, characterized in that: A rubber ring is arranged between the cooling tube and the heat dissipation plate.

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