Battery pack for engineering machinery and battery pack safety system

Abstract

The invention discloses a battery pack for engineering machinery and a battery pack safety system, the battery pack comprises a shell, at least one battery module, at least one buffer assembly and a cover body, an accommodating cavity is formed in the shell, an opening communicated with the accommodating cavity is formed in the shell, at least one buffer cavity is formed in the circumferential side wall of the shell, the battery module is arranged in the accommodating cavity, and the buffer assembly is arranged in the accommodating cavity. The buffer cavity is arranged in the shell and connected to the shell, the buffer assembly is arranged in the buffer cavity and connected to the shell, and the cover body is arranged opposite to the opening and detachably connected to the shell. The battery pack can effectively solve the problem that the battery pack for the engineering machinery is lack of a protection structure, so that the battery is easy to be accidentally bumped to cause a fire during use, and serious potential safety hazards exist.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack for engineering machinery and a battery pack safety system. Background Art

[0002] With the continuous development of new energy technologies, the electrification of construction machinery has become a development trend in the industry.

[0003] For example, the Chinese invention patent with publication number CN119447687A is titled: Battery and Engineering Machinery. The battery includes a battery cell, and the battery cell includes a battery box, a battery module, and an explosion-proof valve. The battery box includes a bottom plate and a plurality of side plates extending in the circumferential direction of the bottom plate. The bottom plate and the plurality of side plates enclose a receiving cavity. The battery module is arranged in the receiving cavity and each battery module includes a plurality of battery cells. At least one of the plurality of side plates includes a smoke exhaust cavity. The smoke exhaust cavity includes an inner cavity, a flue hole provided on the cavity wall of the smoke exhaust cavity close to the receiving cavity, and a smoke exhaust hole provided on the cavity wall of the smoke exhaust cavity away from the receiving cavity. The explosion-proof valve is installed at the smoke exhaust hole. The inner cavity of the smoke exhaust cavity forms a flue. When thermal runaway occurs in the battery module, high-temperature and high-pressure medium enters the flue through the flue hole and acts on the explosion-proof valve. This device can improve the safety of battery use.

[0004] As a core component of electric construction machinery, the performance and reliability of batteries directly affect the overall efficiency and operational safety of construction machinery. However, the lack of protective structure in battery packs used in construction machinery makes the batteries prone to fire due to accidental bumps, posing a serious safety hazard. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a battery pack and a battery pack safety system for construction machinery, so as to solve the technical problem in the prior art that the battery pack for construction machinery lacks a protective structure, which makes the battery prone to fire due to accidental bumps during use, thus leading to serious safety hazards.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a battery pack for construction machinery, comprising: A shell having an accommodating cavity formed therein and an opening communicating with the accommodating cavity, wherein at least one buffer cavity is formed on a circumferential side wall of the shell; at least one battery module, the battery module being built into the accommodating cavity and connected to the housing; at least one buffer assembly, the buffer assembly being built into the buffer cavity and connected to the housing; and The cover is arranged relative to the opening and is detachably connected to the shell.

[0007] In some embodiments, the buffer assembly includes a partition and at least one elastic buffer member, the partition is built into the buffer cavity and separates the buffer cavity into a first cavity and a second cavity that are independent of each other, the first cavity is arranged away from the accommodating cavity relative to the second cavity, and the elastic buffer member is built into the second cavity.

[0008] In some embodiments, two ends of the elastic buffer are respectively connected to two opposite inner side walls of the second cavity, and the length of the elastic buffer is retractable to generate a buffering force to resist the shrinkage of the volume of the second cavity.

[0009] In some embodiments, the elastic buffer includes a fixed tube, a sliding rod and a first elastic portion, one end of the fixed tube is connected to an inner wall of the second cavity, and the other end is provided with a sliding groove along its axis, one end of the sliding rod is slidably inserted in the sliding groove, and the other end is connected to the inner wall of the other opposite side of the second cavity, one end of the first elastic portion is connected to one end of the sliding rod, and the other end is connected to the bottom inner wall of the sliding groove, which is used to push the sliding rod to automatically reset after sliding along the guide of the sliding groove.

[0010] In some embodiments, at least one connecting hole is provided on the side wall of the fixed cylinder, and the connecting hole is connected to the slide groove. The buffer assembly also includes an elastic airbag, a high-pressure gas storage box and a ejector pin. The elastic airbag is built into the second cavity, and the air inlet end of the elastic airbag is connected to the connecting hole. The high-pressure gas storage box is connected to the bottom of the slide groove. The ejector pin is arranged relative to the high-pressure gas storage box and is connected to the sliding rod. The ejector pin can slide close to the high-pressure gas storage box with the sliding rod and puncture the high-pressure gas storage box.

[0011] In some embodiments, the number of the sliding rods in the buffer assembly is multiple, and the multiple sliding rods are arranged at intervals along the surface of the partition, and two adjacent elastic airbags are spaced apart from each other and staggered.

[0012] In some embodiments, buffer cavities are formed on the circumferential side walls of the shell, and the buffer assemblies are arranged in a one-to-one correspondence with the buffer cavities.

[0013] In some embodiments, a water trough is further provided inside the shell, and a wiring trough is provided on the cover body, and the wiring trough is mesh-shaped. The battery for engineering machinery also includes a spray assembly, and the spray assembly includes a temperature sensor, a gas sensor, a wiring hose, multiple nozzles and a water pump. The temperature sensor and the gas sensor are respectively connected to the shell, and the wiring hose is embedded in the wiring trough. The nozzle is arranged relative to the battery module and connected to the wiring hose, and the interior of the nozzle is connected to the interior of the wiring hose. The liquid inlet end of the water pump is connected to the interior of the water trough, and the liquid outlet end is connected to the interior of the wiring hose.

[0014] In some embodiments, the battery pack for engineering machinery further includes a plurality of buffer racks, each of which is in an I-shape and connected to the circumferential outer wall of the shell.

[0015] In the second aspect, the present invention also provides a battery pack safety system for engineering machinery, including a power management module, a signal control module, a temperature control management module, a command control module, a fire warning synchronization module, a control chip, a wireless signal transceiver and the battery pack for engineering machinery as described above, the power management module, signal control module, temperature control management module, command control module, fire warning synchronization module, control chip, and wireless signal transceiver are all connected to the shell, and the power management module, temperature control management module, command control module, fire warning synchronization module, temperature sensor, and gas sensor are bidirectionally communicated with the signal control module, and the output end of the command control module is electrically connected to the external control end.

[0016] Compared with the prior art, the beneficial effects of the battery pack and battery pack safety system for engineering machinery provided by the present invention include: a housing for accommodating a battery module is provided on the shell of the battery pack for engineering machinery, and at least one buffer cavity is further provided on the circumferential side wall of the shell, at least one buffer assembly is built into the buffer cavity, and the buffer assembly is capable of generating a buffering force to resist the volume reduction of the buffer cavity, and the cover body is detachably connected to the shell to achieve wrapping protection for the battery module. Compared with the prior art, by providing at least one buffer cavity in the circumference of the battery module and utilizing the buffering force generated by the buffer assembly to resist the deformation or volume reduction of the buffer cavity caused by accidental collisions, the extrusion of the battery module caused by the deformation or volume reduction of the buffer cavity and the fire of the battery pack caused by the extrusion can be reduced. This can solve the technical problem in the prior art that the battery pack for engineering machinery lacks a protective structure, making the battery easy to catch fire due to accidental collisions during use, thereby causing serious safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of a battery pack for engineering machinery provided by one embodiment of the present invention; Figure 2 is a cross-sectional view of a battery pack for engineering machinery provided by one embodiment of the present invention; Figure 3 is a cross-sectional view of the connection between the housing and the buffer assembly provided by one embodiment of the present invention; Figure 4 This is a schematic diagram of the electrical connections of a battery pack safety system for engineering machinery provided by one embodiment of the present invention.

[0018] Description of reference numerals: Shell 100; accommodating cavity 110; opening 120; buffer cavity 130; first cavity 131; second cavity 132; battery module 200; buffer assembly 300; partition 310; elastic buffer member 320; fixing cylinder 321; sliding rod 322; first elastic part 323; elastic airbag 330; high-pressure gas storage box 340; ejector pin 350; cover body 400; spray assembly 500; temperature sensor 510; gas sensor 520; wiring hose 530; nozzle 540; water pump 550; buffer rack 600; power management module 710; signal control module 720; temperature control management module 730; instruction control module 740; fire warning synchronization module 750; control chip 760; wireless signal transceiver 770. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem that the battery pack for engineering machinery lacks a protective structure, which makes the battery easy to catch fire due to accidental bumps during use, thereby causing serious safety hazards, the present invention provides a battery pack for engineering machinery and a battery pack safety system, which can achieve this by arranging at least one buffer cavity 130 in the circumference of the battery module 200, and using the buffer force generated by the buffer assembly 300 to resist the deformation or volume reduction of the buffer cavity 130 caused by accidental bumps, thereby reducing the extrusion of the battery module 200 caused by the deformation or volume reduction of the buffer cavity 130 and the fire of the battery pack after the extrusion.

[0021] See also Figures 1 to 4 , Figures 1 to 3This is a structural schematic diagram of a battery pack for engineering machinery and a battery pack safety system in one embodiment of the present invention. The battery pack for engineering machinery includes: a shell 100, at least one battery module 200, at least one buffer assembly 300 and a cover body 400. A accommodating cavity 110 is formed inside the shell 100, and an opening 120 connected to the accommodating cavity 110 is provided. At least one buffer cavity 130 is provided on the circumferential side wall of the shell 100. The battery module 200 is built into the accommodating cavity 110 and connected to the shell 100. The buffer assembly 300 is built into the buffer cavity 130 and connected to the shell 100. The cover body 400 is arranged relative to the opening 120 and is detachably connected to the shell 100.

[0022] In the present device, at least one buffer cavity 130 is provided in the circumference of the battery module 200, and the buffer force generated by the buffer assembly 300 is used to resist the deformation or volume reduction of the buffer cavity 130 caused by accidental bumps, thereby reducing the squeezing of the battery module 200 caused by the deformation or volume reduction of the buffer cavity 130 and the fire of the battery pack after being squeezed. This can solve the technical problem in the prior art that the battery pack for engineering machinery lacks a protective structure, which makes the battery easy to catch fire due to accidental bumps during use, thereby leading to serious safety hazards.

[0023] Furthermore, the shell 100 in the present device is in the shape of a rectangular parallelepiped, which is a common and easy-to-purchase device on the market, and the shell 100 is also provided with an explosion-proof valve, a high-voltage output connector interface, a communication connector interface, a manual maintenance switch and a liquid outlet. The explosion-proof valve here is used to realize the pressure relief and explosion-proof function, the high-voltage output connector interface is used to realize the electrical connection between the battery pack and the external device, the communication connector interface is used to realize the communication connection between the battery pack and the external device, the manual maintenance switch is used to facilitate the maintenance and replacement of the battery pack, and the liquid outlet is used to discharge the liquid in the battery pack. These are all conventional settings known to those skilled in the art. Reference can be made to the Chinese invention patent with publication number: CN119133756A, entitled: Battery Pack, Power Battery and Engineering Machinery Vehicle, which will not be elaborated here.

[0024] Furthermore, the battery module 200 in this device is detachably connected to the inner wall of the shell 100 to facilitate the removal or installation of the battery module 200 from the battery pack. This is a conventional setting known to those skilled in the art and will not be described in detail here.

[0025] In this embodiment, Figures 1 to 3As shown, the buffer assembly 300 includes a partition 310 and at least one elastic buffer member 320. The partition 310 is built into the buffer cavity 130 and separates the buffer cavity 130 into a first cavity 131 and a second cavity 132 that are independent of each other. The first cavity 131 is arranged away from the accommodating cavity 110 relative to the second cavity 132. The elastic buffer member 320 is built into the second cavity 132 and can generate a buffer force for resisting the volume reduction of the second cavity 132.

[0026] The partition 310 separates the buffer cavity 130 into a first cavity 131 and a second cavity 132 which are independent of each other, and the elastic buffer 320 is built into the second cavity 132. When the battery pack is accidentally bumped, the first cavity 131 is squeezed and deformed or its volume is reduced to prevent the battery module 200 from being squeezed. When the bump or impact is large, the impact force continues to squeeze the second cavity 132. The elastic recovery force generated by the elastic buffer 320 can partially offset the impact force or squeezing force, thereby reducing the impact or squeezing on the battery module 200.

[0027] Furthermore, the material of the partition 310 here is the same as that of the shell 100. It is a common and easy-to-purchase device on the market and a conventional setting known to those skilled in the art. It will not be described in detail here.

[0028] In one embodiment, see Figure 3 The two ends of the elastic buffer 320 are respectively connected to the two opposite inner walls of the second cavity 132, and the length of the elastic buffer 320 is retractable.

[0029] The two ends of the elastic buffer 320 are respectively connected to the two opposite inner side walls of the second cavity 132 , and the elastic restoring force generated by the length expansion and contraction of the elastic buffer 320 counteracts the volume reduction or deformation of the second cavity 132 .

[0030] In one embodiment, see Figure 3 The elastic buffer member 320 includes a fixed cylinder 321, a sliding rod 322 and a first elastic portion 323. One end of the fixed cylinder 321 is connected to an inner wall of the second cavity 132, and the other end is provided with a sliding groove along its axis. One end of the sliding rod 322 is slidably inserted in the sliding groove, and the other end is connected to the inner wall of the other opposite side of the second cavity 132. One end of the first elastic portion 323 is connected to one end of the sliding rod 322, and the other end is connected to the bottom inner wall of the sliding groove, which is used to push the sliding rod 322 to slide along the guide of the sliding groove and then automatically reset.

[0031] The fixed cylinder 321, the sliding rod 322 and the first elastic part 323 form an elastic telescopic structure, which is similar to a pneumatic spring. After being squeezed, the partition 310 can push the sliding rod 322 to slide relative to the fixed cylinder 321, and the first elastic part 323 can abut the sliding rod 322 to slide relative to the cylinder, thereby generating a buffering force or resistance force.

[0032] Furthermore, the first elastic portion 323 here is a spring, a spring sheet and an elastic block that are common and easy to purchase on the market. This is a conventional setting known to those skilled in the art and will not be described in detail here.

[0033] In one embodiment, see Figure 3 The side wall of the fixed cylinder 321 is provided with at least one connecting hole, which is connected to the slide groove. The buffer assembly 300 also includes an elastic airbag 330, a high-pressure gas storage box 340 and a ejector pin 350. The elastic airbag 330 is built into the second cavity 132, and the air inlet end of the elastic airbag 330 is connected to the connecting hole. The high-pressure gas storage box 340 is connected to the bottom of the slide groove. The ejector pin 350 is arranged relative to the high-pressure gas storage box 340 and is connected to the sliding rod 322. The ejector pin 350 can slide close to the high-pressure gas storage box 340 with the sliding rod 322 and puncture the high-pressure gas storage box 340.

[0034] By arranging an elastic airbag 330 and a high-pressure gas storage box 340 in the second cavity 132, and arranging a ejector pin 350 relative to the high-pressure gas storage box 340, and utilizing the ejector pin 350 to slide relative to the fixed cylinder 321 along with the sliding rod 322 to drive the ejector pin 350 to puncture the high-pressure gas storage box 340, and then utilizing the high-pressure gas in the high-pressure gas storage box 340 to increase the volume of the elastic airbag 330, a buffering force can be generated to resist the volume reduction of the second cavity 132.

[0035] Furthermore, the high-pressure gas storage box 340 and the elastic airbag 330 here are common and easy-to-purchase equipment on the market. The gas stored in the high-pressure gas storage box 340 can only cause the volume expansion of the elastic airbag 330, and will not cause the high-pressure gas storage box 340 or the elastic airbag 330 to explode. This is a conventional setting known to technical personnel in this field and will not be elaborated here.

[0036] In addition, in some embodiments, solid sodium azide or ammonium nitrate can be set in the high-pressure gas storage box 340, and the fixed rod is used to collide with the bottom of the slide groove to make the solid sodium azide or ammonium nitrate expand and release a large amount of nitrogen within 0.1 seconds, so that the elastic airbag 330 is expanded. No more details are given here.

[0037] In one embodiment, referring to the figure, the buffer assembly 300 includes a plurality of sliding rods 322 , which are spaced apart along the surface of the partition 310 , and two adjacent elastic airbags 330 are spaced apart and staggered.

[0038] The plurality of sliding rods 322 are spaced apart along the surface of the partition 310 , which can increase the probability of the elastic airbag 330 expanding in volume, thereby improving the buffering effect and increasing the stability of the device operation.

[0039] Furthermore, the two adjacent elastic airbags 330 are spaced apart along the inner space of the second cavity 132 , which can increase the probability of volume expansion of the elastic airbags 330 , thereby improving the buffering effect and increasing the stability of the device operation.

[0040] In one embodiment, see Figure 2 The circumferential side walls of the housing 100 are each provided with a buffer cavity 130 , and the buffer assembly 300 is disposed in a one-to-one correspondence with the buffer cavity 130 .

[0041] Buffer cavities 130 are provided on the four side walls and the bottom side wall of the shell 100. Five buffer assemblies 300 are respectively built into the five buffer cavities 130, which are used to resist deformation or extrusion around and at the bottom of the battery module 200, thereby improving the safety of the battery pack.

[0042] In this embodiment, Figure 2 、 Figure 4 As shown, a water trough is provided inside the shell 100, and a wiring trough is provided on the cover 400, which is in a mesh shape. The battery for engineering machinery also includes a spray assembly 500, which includes a temperature sensor 510, a gas sensor 520, a wiring hose 530, multiple nozzles 540 and a water pump 550. The temperature sensor 510 and the gas sensor 520 are respectively connected to the shell 100, and the wiring hose 530 is embedded in the wiring trough. The nozzle 540 is arranged relative to the battery module 200 and is connected to the wiring hose 530, and the interior of the nozzle 540 is connected to the interior of the wiring hose 530. The liquid inlet end of the water pump 550 is connected to the interior of the water trough, and the liquid outlet end is connected to the interior of the wiring hose 530.

[0043] By setting a temperature sensor 510 and a gas sensor 520 in the shell 100, it is possible to check whether a fire or explosion occurs in the battery pack, and use the spray structure set on the shell 100 relative to the battery module 200 to perform targeted spraying to extinguish the battery module 200 or battery cell that has caught fire or exploded.

[0044] Furthermore, by providing a wiring groove on the cover 400 , not only can the thickness of the battery pack be reduced, but also a targeted spraying fire extinguishing method can be implemented for the battery modules 200 or cells that are on fire or exploding, thereby improving safety.

[0045] In one embodiment, see Figure 1The battery pack for engineering machinery further includes a plurality of buffer racks 600 , which are in an I-shape and connected to the circumferential outer wall of the shell 100 .

[0046] By arranging an I-shaped buffer frame 600 in the circumferential direction of the housing 100 , it is possible to resist some external impacts or collisions, thereby improving safety.

[0047] Furthermore, the material of the buffer rack 600 is the same as that of the shell 100 , and is a common and easily purchased device on the market. It is a conventional setting well known to those skilled in the art and will not be described in detail here.

[0048] like Figure 4 As shown, this embodiment also provides a battery pack safety system for engineering machinery, characterized in that it includes a power management module 710, a signal control module 720, a temperature control management module 730, a command control module 740, a fire warning synchronization module 750, a control chip 760, a wireless signal transceiver 770 and a battery pack for engineering machinery, the power management module 710, the signal control module 720, the temperature control management module 730, the command control module 740, the fire warning synchronization module 750, the control chip 760, and the wireless signal transceiver 770 are all connected to the shell 100, and the power management module 710, the temperature control management module 730, the command control module 740, the fire warning synchronization module 750, the temperature sensor 510, and the gas sensor 520 are bidirectionally communicated with the signal control module 720, and the output end of the command control module 740 is electrically connected to the external control end.

[0049] The power management module 710 is used to monitor the power change data of the battery pack, control chip 760, wireless signal transceiver 770, and surveillance camera during normal use in real time; the signal control module 720 is used to manage the signal quality during communication between modules within the system and make corresponding adjustments; the temperature control management module 730 is used to monitor the temperature changes inside the shell 100 through the temperature sensor 510, and to feed back the signal to the command control module 740 when monitoring fire or smoke inside the shell 100 through the smoke sensor, and perform remote management through the external control terminal.

[0050] Furthermore, the power management module 710, signal control module 720, temperature control management module 730, instruction control module 740, fire warning synchronization module 750, control chip 760, and wireless signal transceiver 770 are all common and easy-to-procure equipment on the market. Electrical connection or communication connection can be achieved here to achieve automated and intelligent monitoring. This is a conventional setting known to those skilled in the art and will not be elaborated on here.

[0051] Furthermore, the command control module 740 is also electrically connected to the water pump 550 to realize the automatic and intelligent control of the spray assembly 500, which will not be elaborated here.

[0052] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: The housing 100 of the battery pack for construction machinery has a housing cavity 110 for accommodating the battery module 200. The housing 100 also has at least one buffer cavity 130 defined along its circumferential sidewalls. At least one buffer assembly 300 is located within the buffer cavity 130, generating a buffering force to resist volume reduction in the buffer cavity 130. A cover 400 is detachably connected to the housing 100 to provide protective wrapping for the battery module 200. Compared to the prior art, this design provides at least one buffer cavity 130 circumferentially around the battery module 200, utilizing the buffering force generated by the buffer assembly 300 to resist deformation or volume reduction of the buffer cavity 130 due to accidental impacts. This reduces the risk of compression of the battery module 200 and fire in the battery pack caused by compression.

[0053] According to the specific working process of the present invention, when the engineering machinery is in use, slight collisions are absorbed by the buffer frame 600. When a larger impact or collision occurs, the first cavity 131 is destroyed and the second cavity 132 is continuously squeezed. Under the action of the first elastic part 323, the impact force can be absorbed or resisted to prevent it from directly acting on the battery module 200. When the impact or collision is further increased, the ejector pin 350 slides with the sliding rod 322 and pierces the high-pressure gas storage box 340, causing the volume of the elastic airbag 330 to expand, thereby generating secondary resistance and absorption to the impact, which can effectively prevent the impact force from directly acting on the battery module 200 and causing the battery module 200 to catch fire or explode.

[0054] Furthermore, when a fire or explosion occurs, the temperature sensor 510, the gas sensor 520, the power management module 710, the signal control module 720, the temperature control management module 730, the instruction control module 740, the fire warning synchronization module 750, the control chip 760, and the wireless signal transceiver 770 can be used to start the water pump 550, and use the nozzle to perform targeted spraying to extinguish the fire of the battery module 200 that has caught fire or exploded, which can effectively improve the safety of the battery pack.

[0055] Through the above-mentioned structure and system, this device can solve the technical problem in the prior art that the battery pack for engineering machinery lacks a protective structure, which makes the battery prone to fire due to accidental bumps during use, thereby causing serious safety hazards.

[0056] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A battery pack for construction machinery, characterized in that: include: A shell having an accommodating cavity formed therein and an opening communicating with the accommodating cavity, wherein at least one buffer cavity is formed on a circumferential side wall of the shell; at least one battery module, the battery module being built into the accommodating cavity and connected to the housing; at least one buffer assembly, the buffer assembly being built into the buffer cavity and connected to the housing; and The cover is arranged relative to the opening and is detachably connected to the shell.

2. The battery pack for construction machinery according to claim 1, characterized in that: The buffer assembly includes a partition and at least one elastic buffer member. The partition is built into the buffer cavity and divides the buffer cavity into a first cavity and a second cavity that are independent of each other. The first cavity is arranged away from the accommodating cavity relative to the second cavity, and the elastic buffer member is built into the second cavity.

3. The battery pack for construction machinery according to claim 2, characterized in that: Two ends of the elastic buffer are respectively connected to two opposite inner side walls of the second cavity, and the length of the elastic buffer is retractable to generate a buffering force to resist the shrinkage of the volume of the second cavity.

4. The battery pack for construction machinery according to claim 2, characterized in that: The elastic buffer includes a fixed tube, a sliding rod and a first elastic part. One end of the fixed tube is connected to an inner wall of the second cavity, and the other end is provided with a sliding groove along its axis. One end of the sliding rod is slidably inserted in the sliding groove, and the other end is connected to the inner wall of the other opposite side of the second cavity. One end of the first elastic part is connected to one end of the sliding rod, and the other end is connected to the bottom inner wall of the sliding groove, which is used to push the sliding rod to automatically reset after sliding along the guide of the sliding groove.

5. The battery pack for construction machinery according to claim 4, characterized in that: The side wall of the fixed cylinder is provided with at least one communicating hole, which is connected to the slide groove. The buffer assembly also includes an elastic airbag, a high-pressure gas storage box and a ejector pin. The elastic airbag is built into the second cavity, and the air inlet end of the elastic airbag is connected to the connecting hole. The high-pressure gas storage box is connected to the bottom of the slide groove. The ejector pin is arranged relative to the high-pressure gas storage box and is connected to the sliding rod. The ejector pin can slide close to the high-pressure gas storage box with the sliding rod and puncture the high-pressure gas storage box.

6. The battery pack for construction machinery according to claim 5, characterized in that: There are multiple sliding rods in the buffer assembly, and the multiple sliding rods are arranged at intervals along the surface of the partition, and two adjacent elastic airbags are spaced apart and staggered.

7. The battery pack for construction machinery according to claim 5, characterized in that: The circumferential side walls of the shell are each provided with a buffer cavity, and the buffer components are arranged in a one-to-one correspondence with the buffer cavities.

8. The battery pack for construction machinery according to claim 1, characterized in that: A water trough is also provided inside the shell, and a wiring trough is provided on the cover body, and the wiring trough is mesh-shaped. The battery for engineering machinery also includes a spray assembly, and the spray assembly includes a temperature sensor, a gas sensor, a wiring hose, multiple nozzles and a water pump. The temperature sensor and the gas sensor are respectively connected to the shell, and the wiring hose is embedded in the wiring trough. The nozzle is arranged relative to the battery module and is connected to the wiring hose, and the interior of the nozzle is connected to the interior of the wiring hose. The liquid inlet end of the water pump is connected to the interior of the water trough, and the liquid outlet end is connected to the interior of the wiring hose.

9. The battery pack for construction machinery according to claim 1, characterized in that: The battery pack for engineering machinery further includes a plurality of buffer racks, each of which is in the shape of an I and is connected to the circumferential outer wall of the shell.

10. A battery pack safety system for engineering machinery, characterized in that: It includes a power management module, a signal control module, a temperature control management module, a command management module, a fire warning synchronization module, a control chip, a wireless signal transceiver and a battery pack for engineering machinery as described in any one of claims 1 to 9, wherein the power management module, signal control module, temperature control management module, command management module, fire warning synchronization module, control chip and wireless signal transceiver are all connected to the shell, and the power management module, temperature control management module, command management module, fire warning synchronization module, temperature sensor and gas sensor are bidirectionally communicated with the signal control module, and the output end of the command management module is electrically connected to the external control end.

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