Battery pack

Abstract

The present invention relates to the technical field of batteries, and discloses a battery pack, which comprises: a battery module, which comprises: a battery row; the adjustable steel belt mechanism extends to pass through the battery row or surround the battery row along the arrangement direction of the battery row, and the extension length of the adjustable steel belt mechanism is adjustable; the detection unit is connected with the adjustable steel belt mechanism and is suitable for detecting the stretching degree of the adjustable steel belt mechanism; the battery pack further comprises a box body which is provided with an accommodating space, and the battery module is arranged in the accommodating space; and the fire-fighting mechanism is electrically connected with the detection unit, and when the detection unit detects that the stretching degree of the adjustable steel belt mechanism reaches a preset value, the fire-fighting mechanism is controlled to communicate with the containing space. The detection unit is used for detecting the stretching degree of the adjustable steel belt mechanism, when the detection unit detects that the stretching degree of the adjustable steel belt mechanism reaches a preset value, it is proved that the battery is in the initial stage of thermal runaway, at the moment, the fire fighting mechanism is controlled to be started to introduce a fire extinguishing material into the containing space, and larger safety accidents are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] With the increasing development of energy storage systems, the safety requirements for these systems are also increasing. Thermal runaway can occur within battery packs, leading to fires that can spread to the entire battery module and pack, causing serious safety risks and economic losses. Although battery packs are currently equipped with fire extinguishing devices, these devices are unable to accurately and quickly identify and initiate firefighting responses in the early stages of thermal runaway, resulting in a high fire risk in battery packs. Summary of the Invention

[0003] In view of this, the present invention provides a battery pack to solve the problem that existing fire extinguishing devices are unable to accurately and quickly identify and respond to fire in the early stages of battery thermal runaway, resulting in a high fire risk in the battery pack.

[0004] The present invention provides a battery pack, comprising: a battery module, the battery module comprising: a battery row; an adjustable steel belt mechanism, extending through the battery row or surrounding the battery row along the arrangement direction of the battery row, the extension length of the adjustable steel belt mechanism being adjustable; a detection unit, connected to the adjustable steel belt mechanism and suitable for detecting the stretching degree of the adjustable steel belt mechanism; the battery pack also comprises: a box body, having a accommodating space, the battery module being arranged in the accommodating space; a fire-fighting mechanism, electrically connected to the detection unit, the detection unit detecting that the stretching degree of the adjustable steel belt mechanism reaches a preset value, and controlling the fire-fighting mechanism to be connected to the accommodating space.

[0005] In an optional embodiment, the adjustable steel belt mechanism includes: a steel belt body; a rotating structure that is rotatably arranged, and the steel belt body is wound around the rotating structure; an adjustment structure that is transmission-connected to the rotating structure, and the adjustment structure is suitable for rotating the rotating structure to drive the steel belt body to extend or retract from the rotating structure.

[0006] In an optional embodiment, the adjustment structure includes a torsion elastic member, one end of the torsion elastic member is fixedly arranged, and the other end of the torsion elastic member is connected to the rotation structure.

[0007] In an optional embodiment, the detection unit is transmission-connected to the rotating structure.

[0008] In an optional embodiment, the battery module further includes end plates, which are provided on opposite sides of the battery row along the arrangement direction. The adjustable steel belt mechanism is fixedly provided on the end plate on one side, and extends through the battery row and is connected to the end plate on the other side, or surrounds the battery row and is connected to the same end plate.

[0009] In an optional embodiment, the battery module further includes a mounting bracket, which is connected to the detection unit and to the end plate.

[0010] In an optional embodiment, the fire-fighting mechanism includes an input pipeline, a one-way valve and a tail pipe pipeline. The first end of the input pipeline is suitable for connecting with fire extinguishing materials. The second end of the input pipeline is connectable to the first end of the tail pipe pipeline through the one-way valve. The second end of the tail pipe pipeline is closed. The tail pipe pipeline has a bursting part, which is suitable for being flushed open when a predetermined pressure is reached inside the tail pipe pipeline. The one-way valve is electrically connected to the detection unit.

[0011] In an optional embodiment, the box body is provided with an explosion-proof valve, and the accommodating space is suitable for communicating with the outside of the box body through the explosion-proof valve.

[0012] In an optional embodiment, a plurality of battery modules are arranged in the accommodating space.

[0013] In an optional embodiment, the battery pack further includes a partition, which is arranged in the box body and divides the accommodating space into several sub-cavities, several battery modules are arranged in several of the sub-cavities, several fire-fighting mechanisms are provided and respectively correspond to several of the sub-cavities, and several explosion-proof valves are provided and respectively correspond to several of the sub-cavities.

[0014] The technical solution of this application has the following advantages:

[0015] An adjustable steel belt mechanism is used to fix the battery row, and the extension length of the adjustable steel belt mechanism is adjustable. Therefore, when the battery expands or contracts, the preload force on the battery row can be adjusted by adjusting the extension length of the adjustable steel belt mechanism, ensuring that the adjustable steel belt mechanism can provide a stable preload force to the battery row, thereby ensuring the stability and accuracy of the position of each battery; when the battery undergoes thermal runaway, it will expand, which will cause the adjustable steel belt mechanism to further stretch, and the stretching degree of the adjustable steel belt mechanism is detected by a detection unit. When the detection unit detects that the stretching degree of the adjustable steel belt mechanism reaches a preset value, it proves that the battery is in the early stage of thermal runaway. At this time, the fire-fighting mechanism is controlled to start the introduction of fire-extinguishing materials into the accommodation space to avoid causing a larger safety accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of a battery module according to an embodiment of the present invention;

[0019] Figure 3 This is a structural schematic diagram of an adjustable steel belt mechanism and a detection unit according to an embodiment of the present invention;

[0020] Figure 4 This is a structural diagram of a box and a fire-fighting mechanism according to an embodiment of the present invention;

[0021] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0022] Figure 6 for Figure 2 A schematic structural diagram of the battery module from another angle;

[0023] Figure 7 for Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0024] Figure 8 Schematic diagram of the structure of another battery pack according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Battery module; 11. Battery row; 111. Battery; 12. Adjustable steel belt mechanism; 121. Steel belt body; 122. Rotating structure; 123. Adjusting structure; 124. Casing; 13. Detection unit; 14. End plate; 15. Mounting bracket; 16. Buckle structure; 17. Slot; 2. Box; 21. Accommodating space; 211. Sub-chamber; 3. Fire-fighting mechanism; 31. Input pipeline; 32. One-way valve; 33. Tail pipe pipeline; 331. Blasting part; 34. Pipeline joint; 4. Explosion-proof valve; 5. Partition; 6. Main pipeline; 7. Main valve; 8. Box joint; 100. Battery pack. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The following combination Figures 1 to 8 , describing embodiments of the present invention.

[0029] According to an embodiment of the present invention, a battery pack 100 is provided, comprising: a battery module 1, a housing 2, and a fire-fighting mechanism 3. The battery module 1 comprises: a battery row 11; an adjustable steel belt mechanism 12, extending through the battery row 11 or arranged around the battery row 11 along the arrangement direction of the battery row 11, and the extension length of the adjustable steel belt mechanism 12 is adjustable; a detection unit 13, connected to the adjustable steel belt mechanism 12, and suitable for detecting the degree of stretching of the adjustable steel belt mechanism 12. The housing 2 has a receiving space 21, and the battery module 1 is arranged in the receiving space 21. The fire-fighting mechanism 3 is electrically connected to the detection unit 13. The detection unit 13 detects that the degree of stretching of the adjustable steel belt mechanism 12 reaches a preset value, and controls the fire-fighting mechanism 3 to be connected to the receiving space 21.

[0030] The battery pack 100 of this embodiment uses an adjustable steel belt mechanism 12 to fix the battery array 11, and the extension length of the adjustable steel belt mechanism 12 is adjustable. Therefore, when the battery 111 expands or contracts, the preload force on the battery array 11 can be adjusted by adjusting the extension length of the adjustable steel belt mechanism 12, thereby ensuring that the adjustable steel belt mechanism 12 can provide a stable preload force to the battery array 11, thereby ensuring the stability and accuracy of the position of each battery 111; when the battery 111 undergoes thermal runaway, it will expand, thereby causing the adjustable steel belt mechanism 12 to further stretch, and the stretching degree of the adjustable steel belt mechanism 12 is detected by the detection unit 13. When the detection unit 13 detects that the stretching degree of the adjustable steel belt mechanism 12 reaches a preset value, it proves that the battery 111 is in the early stage of thermal runaway. At this time, the fire-fighting mechanism 3 is controlled to start the introduction of fire-extinguishing materials into the accommodating space 21 to avoid causing a larger safety accident.

[0031] It is worth noting that in the related art, one fire extinguishing scheme is to use a temperature sensor to detect the temperature inside the box 2. When the battery 111 thermally runs away, the temperature inside the box 2 rises. When the temperature reaches a predetermined value, the fire-fighting mechanism 3 is controlled to start extinguishing the fire. Another fire-fighting scheme is to use a gas analyzer to detect the gas concentration of flammable gases such as H2 and CO in the box 2. When the gas concentration reaches a predetermined value, it is determined that thermal runaway has occurred, and the fire-fighting mechanism 3 is controlled to start extinguishing the fire. However, in the early stage of thermal runaway of the battery 111, the temperature changes relatively slowly. Generally, it is necessary to wait until an open flame is generated before a large temperature change can be detected. At this time, the best time for fire extinguishing has passed, which can easily cause a larger fire. In addition, because the gas concentration released by different batteries 111 during thermal runaway will deviate, it is difficult for a gas detection and analysis mechanism to adapt to multiple batteries 111. Not only is the monitoring process complicated, but the setup cost is also high.

[0032] In this embodiment, a detection scheme is set based on the physical characteristic changes of the battery 111 during thermal runaway (expansion of the battery 111), rather than electrochemical monitoring, which improves the detection accuracy and reaction speed. Firefighting can be carried out in the early stage of thermal runaway of the battery 111, reducing the risk of accidents.

[0033] Specifically, in this embodiment, Figure 2 As shown, the battery array 11 includes a plurality of batteries 111 arranged in an array. The battery array 11 formed by the plurality of batteries 111 is tied and fixed using an adjustable steel belt mechanism 12.

[0034] It should be noted that in the related art, the steel belt provided on the battery array 11 is of fixed length. When the battery 111 shrinks (for example, shrinking when switching from a hot environment to a cold environment), the steel belt cannot be tightened and cannot stably restrict the battery array 11. However, on one side of the battery array 11, multiple batteries 111 are connected by a busbar to achieve electrical connection of multiple batteries 111, so that the battery array 11 forms a whole. During the use or transportation of the battery module 1, due to factors such as vibration or bumps and shaking, the battery 111 may move, causing the welding points between the busbar and the battery 111 to be disconnected, causing the battery 111 to be short-circuited, and even causing the entire battery module 1 to fail. Therefore, in this embodiment, by providing an adjustable steel belt mechanism 12, it is possible to achieve reliable restriction of the battery array 11, thereby ensuring reliable connection of the busbar between the batteries 111 and ensuring normal and safe operation of the battery module 1.

[0035] Furthermore, when the battery 111 expands (e.g., during charge and discharge cycles), the steel belt will be further tightened, posing the risk of damaging the battery 111 and possibly breaking the steel belt. Therefore, in the related art, a buffer structure is typically provided between adjacent batteries 111 and / or between the battery 111 and the end plate 14 to absorb the expansion of the battery 111. However, the provision of a buffer structure takes up additional space in the battery pack 100, affecting the energy density of the battery pack 100. Therefore, in this embodiment, by providing an adjustable steel belt mechanism 12, excessive tightening of the steel belt can be avoided without providing a buffer structure, thereby ensuring the integrity of the battery 111 and the steel belt.

[0036] Furthermore, in the related art, for different models of battery modules 1, it is usually necessary to set corresponding fixed-length steel strips according to their sizes. Therefore, when the number of batteries 111 changes, the steel strips need to be replaced with different lengths to adapt to the new battery modules 1, resulting in complex processes and wasteful materials. In this embodiment, the extension length of the adjustable steel strip mechanism 12 can be adjusted at any time according to the size of the battery module 1, thereby improving the compatibility with the battery module 1, simplifying the process, and reducing consumables.

[0037] At the same time, in this embodiment, the stretchability of the adjustable steel belt mechanism 12 is utilized to detect the degree of stretching of the adjustable steel belt mechanism 12, thereby determining the degree of expansion of the battery 111 and, further, determining whether thermal runaway has occurred in the battery 111. Specifically, when thermal runaway occurs in the battery 111, it will expand to a certain extent, thereby causing the adjustable steel belt mechanism 12 to further stretch out. By detecting the further stretched length (i.e., the degree of stretching) of the adjustable steel belt mechanism 12, it is determined whether the fire-fighting mechanism 3 needs to be activated. When it is detected that the degree of stretching of the adjustable steel belt mechanism 12 reaches a preset value, the fire-fighting mechanism 3 is controlled to start and introduce fire-extinguishing material into the accommodating space 21.

[0038] In one embodiment, Figure 3 As shown, the adjustable steel belt mechanism 12 includes: a steel belt body 121; a rotating structure 122, which is rotatably arranged, and the steel belt body 121 is wound around the rotating structure 122; an adjusting structure 123, which is transmission-connected to the rotating structure 122, and the adjusting structure 123 is suitable for rotating the rotating structure 122 to drive the steel belt body 121 to extend or retract from the rotating structure 122.

[0039] It is understandable that when the steel belt body 121 needs to be retracted from the rotating structure 122, the rotating structure 122 can be rotated in the positive direction; when the steel belt body 121 needs to be extended from the rotating structure 122, the rotating structure 122 can be rotated in the reverse direction.

[0040] Furthermore, in one embodiment, Figure 3As shown, the detection unit 13 is in transmission connection with the rotating structure 122. That is, the detection unit 13 detects the rotation amount of the rotating structure 122, and then obtains the stretching degree of the steel belt body 121, thereby judging the expansion degree of the battery 111.

[0041] Specifically, in one embodiment, the adjustment structure 123 includes a torsion elastic member, one end of which is fixedly mounted, and the other end of which is connected to the rotating structure 122. Therefore, when the steel strip body 121 extends, it drives the rotating structure 122 to rotate, while simultaneously causing the torsion elastic member to twist and store energy, thereby tensioning the steel strip body 121 under the action of the elastic force. Furthermore, by providing the torsion elastic member, the torsion elastic member can be further twisted or relaxed when the battery cell expands or contracts, thereby enabling the extension length of the steel strip body 121 to be adjusted in real time according to the state of the battery cell, ensuring that the steel strip body 121 provides a stable preload to the battery array 11.

[0042] In one embodiment, Figure 3 As shown, the adjustable steel belt mechanism 12 further includes a housing 124, the rotating structure 122 and the adjusting structure 123 are both disposed within the housing 124, and the steel belt body 121 is adapted to extend out from the interior of the housing 124. Specifically, in one embodiment, a first end of the torsion elastic member is fixedly connected to the housing 124, and a second end of the torsion elastic member is connected to the rotating structure 122.

[0043] In one embodiment, Figure 3 As shown, the rotating structure 122 includes a drum and a rotating shaft. The steel belt body 121 is wound on the drum. The rotating shaft is coaxially connected to the drum, and the rotating shaft is connected to the second end of the torsional elastic member.

[0044] Specifically, in one embodiment, the torsion elastic member is a torsion spring. Furthermore, the adjustable steel belt mechanism 12 further includes a limiting shell, which is disposed in the outer shell 124 and surrounds the outer periphery of the torsion elastic member.

[0045] It is worth noting that a torsion elastic member with appropriate elastic force can be selected according to actual needs.

[0046] In one embodiment, Figure 2 As shown, the battery module 1 also includes an end plate 14, and the end plates 14 are provided on opposite sides of the battery row 11 along the arrangement direction. The adjustable steel belt mechanism 12 is fixedly provided on the end plate 14 on one side, and extends through the battery row 11 and is connected to the end plate 14 on the other side, or surrounds the battery row 11 and is connected to the same end plate 14.

[0047] It is worth noting that, please refer to Figure 2When the adjustable steel band mechanism 12 is fixed to the end plate 14 on one side and extends through the battery row 11 to connect to the end plate 14 on the other side, one side of the end plate 14 is fixed to the box 2 of the battery pack 100, and the adjustable steel band mechanism 12 extends from the other side of the battery row 11, thereby fixing the battery row 11 in the longitudinal direction to ensure the alignment of multiple battery cells on the top surface. When the adjustable steel band mechanism 12 is fixed to the end plate 14 on one side and surrounds the battery row 11 and connects to the same end plate 14, the battery row 11 can be fixed in the circumferential direction through the adjustable steel band mechanism 12 to ensure the alignment of multiple battery cells on the side.

[0048] It should be noted that the steel belt body 121 is a belt-like structure with a certain length and two ends, one of which is connected to the rotating structure 122 so that the steel belt body 121 is wound on the rotating structure 122, and the other end is a free end and can be connected and fixed to the end plate 14.

[0049] In one embodiment, the end of the steel belt body 121 away from the rotating structure 122 is detachably connected to the end plate 14. This arrangement facilitates the disassembly and assembly of the steel belt body 121, facilitates the repair and replacement of the battery row 11, and reduces the maintenance cost of the battery pack 100.

[0050] It is worth noting that in related art, adjacent battery cells are typically bonded together using a colloid to form a single unit, which is then secured circumferentially using a steel band. Consequently, when one or more battery cells fail, the individual cells cannot be removed for replacement, resulting in the entire battery module 1 being scrapped. In this embodiment, however, the adjustable steel band mechanism 12 provides a stable preload to the battery array 11, eliminating the need to bond adjacent battery cells or reduce the bonding area between adjacent cells. The fixed action of the adjustable steel band mechanism 12 allows the battery array 11 to form a stable unit. Furthermore, when one or more battery cells need to be replaced, or when additional or reduced battery cells are required, the battery array 11 can be adjusted by removing the end of the steel band body 121 away from the rotating structure 122 from the end plate 14 (i.e., cancelling the connection with the end plate 14). This facilitates maintenance of the battery module 1 and reduces the repair cost of the battery pack 100.

[0051] Specifically, in one embodiment, the fasteners penetrate the steel strip body 121 and are fastened to the end plate 14. That is, the steel strip body 121 and the end plate 14 are connected by fasteners (e.g., bolts), and the steel strip body 121 and the end plate 14 can be fixed and separated by disassembling the fasteners.

[0052] Or, in other alternative embodiments, such as Figure 6 and Figure 7As shown, the battery module 1 further includes a snap-fit ​​structure 16 disposed on one end of the steel strip body 121 away from the rotating structure 122 and one of the end plates 14. A snap-fitting slot 17 is defined on the end of the steel strip body 121 away from the rotating structure 122 and the other of the end plates 14. The snap-fitting structure 16 and the snap-fitting slot 17 engage with each other. This engagement between the snap-fitting structure 16 and the snap-fitting slot 17 enables a removable connection between the steel strip body 121 and the end plate 14. Furthermore, when the steel strip body 121 is cached within the rotating structure 122 (i.e., when the battery array 11 is not required to be positionally fixed), the snap-fitting structure 16 can be exposed outside the housing 124. This means that the snap-fitting structure 16 does not need to be housed within the housing 124. This facilitates grabbing the snap-fitting structure 16 when the steel strip body 121 is needed to secure the battery array 11, allowing the steel strip body 121 to be pulled out to secure the battery array 11 longitudinally or circumferentially. At this time, it is easier to realize automation of steel belt installation, for example, a robot is used to grab the buckle structure 16 and drive the buckle structure 16 to move and the steel belt body 121 to extend and engage with the slot 17 .

[0053] It is understandable that when the end of the steel belt body 121 away from the adjustment structure 123 is provided with a slot 17, correspondingly, the end plate 14 is provided with a buckle structure 16 (see Figure 7 ); when the steel belt body 121 is away from the end of the adjustment structure 123 is provided with a buckle structure 16, and accordingly, a card slot 17 is provided on the end plate 14.

[0054] Of course, as an alternative embodiment, the end of the steel belt body 121 away from the rotating structure 122 can also be fixedly connected to the end plate 14, for example, by welding, bonding, etc.

[0055] In one embodiment, Figure 3 As shown, the battery module 1 further includes a mounting bracket 15, which is connected to the detection unit 13 and the end plate 14. The detection unit 13 is mounted on the end plate 14 by the mounting bracket 15, which improves the stability of the detection unit 13 and ensures detection accuracy.

[0056] It is worth noting that the detection unit 13 can be an encoder, which is coaxially connected to the reel via a coupling. Of course, the detection unit 13 can also be other linear sensors. Furthermore, the encoder has millimeter-level accuracy and a temperature resistance of not less than 150°C.

[0057] In one embodiment, Figure 5As shown, the fire-fighting mechanism 3 includes an input pipeline 31, a one-way valve 32 and a tail pipe pipeline 33. The first end of the input pipeline 31 is suitable for connecting with the fire-extinguishing material. The second end of the input pipeline 31 is connectable to the first end of the tail pipe pipeline 33 through the one-way valve 32. The second end of the tail pipe pipeline 33 is closed. The tail pipe pipeline 33 has a bursting part 331. The bursting part 331 is suitable for being flushed open when a predetermined pressure is reached inside the tail pipe pipeline 33. The one-way valve 32 is electrically connected to the detection unit 13. When the detection unit 13 detects that the stretching degree of the adjustable steel belt mechanism 12 reaches a preset value (that is, the detection unit 13 detects that the rotation amount of the rotating structure 122 reaches a preset value), a signal is transmitted to the controller. The controller controls the one-way valve 32 to open, allowing the fire extinguishing material to enter the tail pipe pipeline 33 through the input pipeline 31. Under the action of the fire extinguishing material pressure, the bursting part 331 of the tail pipe pipeline 33 is flushed open, and the fire extinguishing material overflows from the tail pipe pipeline 33 and quickly enters the accommodating space 21 to extinguish the battery 111 and control the thermal runaway of the battery 111.

[0058] It is worth noting that the one-way valve 32 and the tail pipe 33 are both disposed within the housing 2. The input pipe 31 can also be disposed within the housing 2. The first end of the input pipe 31 is connected to the housing 2 via a pipe connector 34 and is connected to an external water pump or water tank. Of course, the input pipe 31 can also be disposed outside the housing 2, or can be disposed partially within the housing 2 and partially outside the housing 2.

[0059] It should be noted that the bursting portion 331 can be a bursting valve or a plug structure additionally connected to the tail pipe line 33. For example, the tail pipe line 33 has an opening (which can be, but is not limited to, at the second end of the tail pipe line 33), and the plug structure blocks the opening to prevent fire extinguishing material from accidentally entering the housing 2 in a safe state (i.e., when no fire extinguishing is required), thereby preventing the fire extinguishing material from accidentally entering the housing 2 and causing a safety risk. Furthermore, when the one-way valve 32 is opened and the fire extinguishing material enters the tail pipe line 33, the fire extinguishing material can break open the plug structure, allowing the fire extinguishing material to overflow from the opening. Furthermore, the bursting portion 331 can also be a weak area formed in the tail pipe line 33. For example, the wall thickness of a certain area of ​​the tail pipe line 33 can be reduced. When the one-way valve 32 is opened and the fire extinguishing material enters the tail pipe line 33, the fire extinguishing material can break through the weak area, causing the fire extinguishing material to overflow.

[0060] It is understandable that the fire extinguishing material can be a liquid, such as water, coolant, etc.; it can also be a gas, such as nitrogen; it can also be a solid, such as dry powder fire extinguishing agent.

[0061] It should be noted that, in order to prevent the battery 111 from reigniting, a flooding firefighting method may be used on the battery 111 .

[0062] Specifically, the one-way valve 32 may be a solenoid valve.

[0063] In one embodiment, Figure 4 As shown, the box body 2 is provided with an explosion-proof valve 4, and the accommodating space 21 is adapted to communicate with the outside of the box body 2 through the explosion-proof valve 4. This arrangement can discharge excess gas and fire extinguishing materials in the box body 2 during fire fighting, thereby preventing excessive pressure in the box body 2 from affecting the speed at which the fire extinguishing materials enter.

[0064] In one embodiment, Figure 1 As shown, a plurality of battery modules 1 are arranged in the accommodation space 21. Figure 8 As shown, the battery pack 100 further includes a partition 5, which is disposed within the housing 2 and divides the accommodating space 21 into a plurality of sub-cavities 211. A plurality of battery modules 1 are disposed in the sub-cavities 211. Several fire-fighting mechanisms 3 are provided and correspond to the sub-cavities 211, and several explosion-proof valves 4 are provided and correspond to the sub-cavities 211. With this arrangement, each battery module 1 is individually isolated. When thermal runaway occurs in one or more batteries 111 in a battery module 1, fire-extinguishing materials can be introduced into the sub-cavity 211 where the battery module 1 is located to achieve firefighting, thereby achieving precise firefighting, preventing the scrapping of other normal battery modules 1, and reducing economic costs.

[0065] Specifically, such as Figure 8 As shown, the battery pack 100 further includes a main pipeline 6 and a main valve 7. The main valve 7 is disposed on the main pipeline 6, and the main pipeline 6 is connected to the input pipelines 31 of several fire-fighting agencies 3. Furthermore, the main pipeline 6 is connected to the input pipeline 31 of an adjacent fire-fighting agency 3 via a box-through joint 8. This input pipeline 31 is then connected to the input pipeline 31 of another fire-fighting agency 3 via a box-through joint 8. Of course, the input pipelines 31 of other fire-fighting agencies 3 may also be connected to each other; that is, the input pipelines 31 of several fire-fighting agencies 3 and the main pipeline 6 can be connected in parallel, in series, or in series-parallel.

[0066] When using the battery pack 100 of this embodiment, when one or more batteries 111 experience thermal runaway, the battery 111 expands, causing the steel belt body 121 to stretch, and the steel belt body 121 drives the reel to rotate, causing the encoder reading to change significantly; when the encoder reading exceeds the preset value, a signal is sent to the controller, and the controller controls the one-way valve 32 to open, allowing the fire extinguishing material to enter the tail pipe pipeline 33 through the input pipeline 31. Under the action of the fire extinguishing material pressure, the bursting part 331 of the tail pipe pipeline 33 is flushed open, and the fire extinguishing material overflows from the tail pipe pipeline 33 and quickly enters the accommodating space 21 to extinguish the battery 111.

[0067] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A battery module (1), comprising: Battery row (11); an adjustable steel belt mechanism (12) extending along the arrangement direction of the battery row (11) and passing through the battery row (11) or being arranged around the battery row (11), wherein the extension length of the adjustable steel belt mechanism (12) is adjustable; a detection unit (13), connected to the adjustable steel belt mechanism (12) and adapted to detect the stretching degree of the adjustable steel belt mechanism (12); The battery pack (100) further includes: The box (2) has a receiving space (21), and the battery module (1) is arranged in the receiving space (21); The fire-fighting mechanism (3) is electrically connected to the detection unit (13). The detection unit (13) detects that the stretching degree of the adjustable steel belt mechanism (12) reaches a preset value, and controls the fire-fighting mechanism (3) to communicate with the accommodating space (21).

2. The battery pack according to claim 1, wherein: The adjustable steel belt mechanism (12) comprises: Steel strip body (121); A rotating structure (122) is rotatably arranged, and the steel strip body (121) is wound around the rotating structure (122); The adjusting structure (123) is in transmission connection with the rotating structure (122), and the adjusting structure (123) is suitable for rotating the rotating structure (122) to drive the steel belt body (121) to extend or retract from the rotating structure (122).

3. The battery pack according to claim 2, wherein: The adjustment structure (123) comprises a torsion elastic member, one end of which is fixedly arranged, and the other end of which is connected to the rotating structure (122).

4. The battery pack according to claim 2, wherein: The detection unit (13) is transmission-connected to the rotating structure (122).

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery module (1) further comprises an end plate (14), and the end plates (14) are provided on opposite sides of the battery row (11) along the arrangement direction. The adjustable steel belt mechanism (12) is fixedly provided on the end plate (14) on one side, and extends through the battery row (11) and is connected to the end plate (14) on the other side, or surrounds the battery row (11) and is connected to the same end plate (14).

6. The battery pack according to claim 5, characterized in that: The battery module (1) further comprises a mounting bracket (15), wherein the mounting bracket (15) is connected to the detection unit (13) and to the end plate (14).

7. The battery pack according to any one of claims 1 to 4, characterized in that: The fire-fighting mechanism (3) comprises an input pipeline (31), a one-way valve (32) and a tail pipe pipeline (33); the first end of the input pipeline (31) is suitable for communicating with fire-extinguishing materials; the second end of the input pipeline (31) is communicable with the first end of the tail pipe pipeline (33) via the one-way valve (32); the second end of the tail pipe pipeline (33) is closed; the tail pipe pipeline (33) has a bursting portion (331); the bursting portion (331) is suitable for being opened when a predetermined pressure is reached inside the tail pipe pipeline (33); the one-way valve (32) is electrically connected to the detection unit (13).

8. The battery pack according to claim 7, characterized in that: The box body (2) is provided with an explosion-proof valve (4), and the accommodating space (21) is suitable for communicating with the outside of the box body (2) through the explosion-proof valve (4).

9. The battery pack according to claim 8, characterized in that: A plurality of battery modules (1) are arranged in the accommodating space (21).

10. The battery pack according to claim 9, characterized in that: The battery pack (100) further includes a partition (5), the partition (5) being arranged in the box (2) and dividing the accommodating space (21) into a plurality of sub-cavities (211), a plurality of the battery modules (1) being arranged in the plurality of sub-cavities (211), a plurality of the fire-fighting mechanisms (3) being arranged and corresponding to the plurality of the sub-cavities (211), and a plurality of the explosion-proof valves (4) being arranged and corresponding to the plurality of the sub-cavities (211).

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