Mining explosion-proof lithium iron phosphate battery pack

Abstract

A mining explosion-proof lithium iron phosphate battery pack is composed of a double-material shell with an inner layer structure and an outer layer structure, comprises a steel outer layer shell with heat dissipation ribs, a lithium iron phosphate battery pack inner layer box body made of ABS (Acrylonitrile Butadiene Styrene) materials, a lithium iron phosphate battery box, a miniature pipeline pump and an explosion-proof junction box, structurally integrates intrinsic safety, heat dissipation and explosion-proof wiring into a whole, and is strong in protection, safe and reliable. The device allows stable power supply in a severe environment containing explosive mixed gas of methane, coal dust and rock dust. A CAN FD bus, a dust concentration sensor and a gas concentration sensor can be well combined together, and even a battery pack of a storage battery type electric motor car in a mine or a mine can be changed into a movable dust and gas concentration flow monitoring station based on CAN FD bus control, so that trans-boundary innovation is implemented; the system can be specially used for dealing with vibration caused by bumpiness in mines or roadways and invasion of gas or dust, and it is guaranteed that the system is most economical and overall optimal.

Description

Technical Field

[0001] This invention relates to a mine-use explosion-proof lithium iron phosphate battery pack, which is mainly used as a backup power source in mines or underground battery-powered electric locomotives and underground refuge chambers. Background Technology

[0002] Safety and reliability are paramount concerns for high-power battery packs. Outbursts of rock dust and high-concentration methane gas can cause sudden bursts of broken rock dust and methane gas into the goaf, posing a serious threat to the safety of miners and workers. Even a tiny spark can have disastrous consequences. Therefore, to adapt to the harsh environments of mines and underground mines, there is a strong demand for specially designed mobile high-power battery packs and their enclosures for mining applications. Accordingly, this invention proposes a mining-grade explosion-proof lithium iron phosphate battery pack structure that integrates intrinsic safety, coolant cooling, a local area network bus, and explosion-proof wiring.

[0003] The most significant feature of this mine-use explosion-proof lithium iron phosphate battery pack is its intrinsically safe structure and robust protection, allowing it to operate normally in harsh environments containing explosive mixtures of methane, coal dust, and rock dust. In the embodiments of this invention, it can easily withstand atmospheric pressures of 80 kPa to 106 kPa, relative humidity less than or equal to 95%, and ambient temperatures of -20°C to 50°C. Its robust steel casing provides multiple protection functions, including explosion-proof and shock wave protection, making it an ideal backup power source for mines or underground mines. It is specifically designed to handle vibrations from uneven terrain and the intrusion of gas or dust in mines or tunnels, and can withstand multiple safety tests, including lithium dendrite puncture, short circuit, high temperature, extrusion, drop, and electromagnetic interference tests.

[0004] Unfortunately, most high-power mining batteries are still dominated by lead-acid batteries. The only reason these long-outdated lead-acid batteries still have a market is their low price. However, these cheap lead-acid batteries have many intolerable drawbacks: First, they have low energy density, especially low specific energy and specific power; second, they have a short lifespan; third, they require frequent and demanding maintenance; fourth, lead-acid batteries contain heavy metals harmful to the environment and human health, and their acidic electrolyte is particularly prone to leakage; fifth, they charge slowly, taking at least 8 hours to fully charge; sixth, they are relatively large and heavy for the same energy output; seventh, due to their high internal resistance and self-discharge, lead-acid batteries degrade quickly, making recycling and disposal difficult; and eighth, lead-acid batteries are particularly susceptible to temperature changes, with significantly reduced discharge and charging efficiency in low-temperature environments. Therefore, following the natural progression of battery technology, it is only a matter of time before lead-acid batteries are replaced by advanced lithium-ion battery packs.

[0005] Compared to lead-acid batteries, condensed-state pouch lithium iron phosphate batteries have significant advantages. First, they utilize a multi-layered film packaging consisting of an outer nylon layer, an adhesive layer, a middle layer of aluminum foil, an adhesive layer, and an inner heat-sealing layer (CPP). This multi-layered aluminum-plastic film has excellent ductility; therefore, in abnormal situations such as overcharging, over-discharging, or lithium dendrite puncture short circuits, pouch lithium iron phosphate batteries packaged in aluminum-plastic film will only expand or crack, unlike metal-cased batteries which may explode, indicating higher safety. Second, compared to lead-acid batteries, lithium iron phosphate battery cells have significantly lower ohmic and polarization resistance, greatly reducing self-discharge and improving charging, discharging, and energy conversion efficiency. Third, for the same size, lithium iron phosphate batteries have higher capacity and energy density than lead-acid batteries, and a longer cycle life.

[0006] It should be pointed out that, regardless of whether the steel casing contains lead-acid batteries or lithium iron phosphate batteries, the key is to safely bring out the positive and negative terminals of the power supply in the battery pack inside the steel casing for it to be useful. It is hard to imagine that this small requirement has become the biggest safety hazard and weakness of mining power battery packs, because no matter how mining battery packs are packaged, they cannot be completely sealed. This actually constitutes the origin of this invention application.

[0007] Based on this, the applicant boldly proposed a design scheme for a mine-use explosion-proof lithium iron phosphate battery pack that is completely different from traditional technical approaches. This lithium iron phosphate battery pack structure, which integrates intrinsic safety, coolant heat dissipation, local CAN FD network, sensing, and explosion-proof wiring, can effectively combine the CAN FD bus, dust concentration sensor, and gas concentration sensor by adding an explosion-proof junction box to the steel shell. This transforms the battery pack of a battery-powered electric locomotive in a mine into a mobile monitoring station for dust and gas concentrations, controlled by the CAN FD bus. Particularly significant is that, because the overall battery pack structure is intrinsically safe and the junction box is explosion-proof, even in the most adverse circumstances, the battery power supply bus circuit can be promptly disconnected. Thus, the hazards of the battery pack will at least not leak through the junction box and cause secondary damage. Summary of the Invention

[0008] The details are as follows: A mining-grade explosion-proof lithium iron phosphate battery pack, employing a double-layer structure, comprises the following components: an outer shell with heat dissipation ribs and an outer shell cover, an inner lithium iron phosphate battery pack housing and an inner housing cover, a lithium iron phosphate battery box, a micro pipeline pump, and an explosion-proof junction box. Its key features are as follows: The outer shell cover plate has a built-in reinforcing rib P and has screw holes for fastening the outer shell cover plate; The outer shell has its own heat dissipation ribs, and the bottom edge also has outer shell fixing ears. The outer shell fixing ears have annular fixing holes. During installation, the bolt passes through the annular fixing holes to connect the outer shell to the fixing bracket. On the contact surface between the outer shell and the outer shell cover plate, there is an outer shell groove. During installation, the outer shell cover plate is embedded into the outer shell groove, and then the steel screw is connected to the outer shell through the outer shell cover plate fastening screw hole. The outer shell has a connection hole for connecting the outer shell and the explosion-proof junction box. An internal thread R is engraved at the connection hole. During installation, the explosion-proof junction box is screwed into the internal thread R of the outer shell through the external thread of the top cover, thus realizing the installation of the explosion-proof junction box and the outer shell. The inner casing of the lithium iron phosphate battery pack is an integral injection-molded composite structure. The inner casing of the lithium iron phosphate battery pack is divided into the following parts: coolant storage tank, lithium iron phosphate battery mounting chamber, inner casing cover, and coolant chamber, which can be embedded in the outer casing. In the embodiment, the lithium iron phosphate battery pack consists of 12 independent soft-pack lithium iron phosphate battery boxes connected in series via a busbar, and then installed in the lithium iron phosphate battery mounting chamber in the inner layer of the lithium iron phosphate battery pack. Each lithium iron phosphate battery box has a positive terminal, a negative terminal, and a vent hole. The coolant storage tank is connected to a sealed cover. The lithium iron phosphate battery mounting chamber and the coolant chamber have the following spatial connection in their topological structure: coolant pipe X and coolant pipe Y are connected to the coolant storage tank. Coolant pipe X is first connected to a micro-pipe pump and then connected to the coolant storage tank. Coolant pipe X is connected to the coolant chamber via connecting pipe S. Coolant pipe Y is connected to the coolant chamber via connecting pipe Z. During installation, each lithium iron phosphate battery box is embedded in the lithium iron phosphate battery mounting chamber. The coolant chamber is adjacent to the lithium iron phosphate battery mounting chamber. In order to promote the circulation of coolant, the coolant pipe X and coolant pipe Y are placed with a height difference. Coolant pipe X is placed in the lower part of the inner layer of the lithium iron phosphate battery pack, connected to the micro-pipe pump, and then connected to the coolant storage tank. Coolant pipe Y is placed in the upper part of the inner layer of the lithium iron phosphate battery pack and then connected to the coolant storage tank to form a height difference for coolant circulation. The coolant chamber connected to coolant pipe X has a circular opening T at the bottom and a circular opening U at the top of coolant chamber connected to coolant pipe Y. In this way, the coolant in the coolant storage tank can pass through the coolant chamber through the connecting pipe S of coolant pipe X, driven by the micro-pipe pump, and then through the connecting pipe Z of coolant pipe Y and back to the coolant storage tank. During assembly, the inner cover of the lithium iron phosphate battery pack is tightly connected to the inner casing of the lithium iron phosphate battery pack with welding adhesive. That is, the inner cover of the lithium iron phosphate battery pack just closes the coolant chamber, but leaves an opening for the lithium iron phosphate battery installation chamber. The explosion-proof junction box is connected to the explosion-proof junction box connection hole through the outer shell. The three-dimensional topology of the explosion-proof junction box consists of an upper cover plate, a middle shell, a lower shell, and a base plate. A PCB circuit board is installed in the middle shell, and a microcontroller, an interface chip, and a VMOS transistor are soldered on the PCB circuit board. The lower shell is hexagonal and has six wiring terminals installed externally, namely wiring terminal A, wiring terminal B, wiring terminal C, wiring terminal D, wiring terminal E, and wiring terminal F. CAN FD socket M is screwed into wiring terminal A, CAN FD socket N is screwed into wiring terminal B, the dust sensor is screwed into wiring terminal C, and the gas sensor is screwed into wiring terminal D. The remaining two wiring terminals E and F are connected to the cables. For more detailed claims and technical details regarding the explosion-proof junction box, please refer to the invention patent filed on the same day: "Dual CAN FD Bus Explosion-proof Junction Box with Gas and Dust Sensors," both of which have the same reference numerals.

[0009] Furthermore, both the outer shell with heat dissipation ribs and the outer shell cover are made of cast steel.

[0010] Furthermore, the inner casing of the lithium iron phosphate battery pack, embedded in the outer shell, is made of heat-resistant and flame-retardant ABS engineering plastic and is injection molded in one piece.

[0011] Furthermore, the coolant stored in the coolant tank is a colorless and odorless diol, namely ethylene glycol, rather than pure water.

[0012] Furthermore, the explosion-proof junction box has six terminals, two of which are connected to the gas and dust sensors respectively, two of which are connected to the dual CAN FD sockets respectively, and the remaining two terminals are connected to the cable.

[0013] Furthermore, the microcontroller on the PCB circuit board in the explosion-proof junction box not only controls the explosion-proof junction box, but also controls the VMOS transistor and the micro pipeline pump. The resident program in the microcontroller can be rewritten.

[0014] Furthermore, the inner casing cover of the lithium iron phosphate battery pack is tightly connected to the inner casing of the lithium iron phosphate battery pack using a moisture-proof and heat-resistant strong adhesive. This adhesive is an epoxy resin adhesive, suitable for filling gaps in high-strength ABS. Attached Figure Description

[0015] To clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments are briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. Those skilled in the art can, without creative effort, draw inferences from these drawings and obtain other similar drawings.

[0016] Figure 1 A mining explosion-proof lithium iron phosphate battery pack Figure 1 ; Figure 2 A mining explosion-proof lithium iron phosphate battery pack Figure 2 ; Figure 3 A mining explosion-proof lithium iron phosphate battery pack Figure 3 ; Figure 4 A mining explosion-proof lithium iron phosphate battery pack Figure 4 ; Figure 5 A mining explosion-proof lithium iron phosphate battery pack Figure 5 ; Figure 6 A front view of a mine-use explosion-proof lithium iron phosphate battery pack; Figure 7 Side view of a mine explosion-proof lithium iron phosphate battery pack Figure 8 A mining explosion-proof lithium iron phosphate battery pack decomposition Figure 1 ; Figure 9 A mining explosion-proof lithium iron phosphate battery pack decomposition Figure 2 ; Figure 10 A mining explosion-proof lithium iron phosphate battery pack decomposition Figure 3 ; Figure 11 A mining explosion-proof lithium iron phosphate battery pack decomposition Figure 4 ; Figure 12 Internal view of the lithium iron phosphate battery pack after removing the steel casing Figure 1 ; Figure 13 Internal view of the lithium iron phosphate battery pack after removing the steel casing Figure 2 ; Figure 14Internal view of the lithium iron phosphate battery pack after removing the steel casing Figure 3 ; Figure 15 Circuit diagram of explosion-proof junction box PCB board.

[0017] Label Explanation: 11 Outer shell cover plate 11-1 Reinforcing rib P 11-2 Outer shell cover plate fastening screw holes 12 outer shells 12-1 Outer shell heat dissipation ribs 12-2 Outer shell fixing lug 12-3 Annular fixing hole 12-4 Connection hole between outer shell and explosion-proof junction box 12-5 Outer shell groove 12-6 Internal thread R 14 Lithium Iron Phosphate Battery Box 14-1 Battery box positive terminal 14-2 Battery box negative terminal 14-3 Exhaust port 16-1 Coolant Storage Tank 16-2 Coolant reservoir cap 17. Inner casing of lithium iron phosphate battery pack 17-1 Coolant Chamber 17-2 Coolant Pipe X 17-2-1 Connecting pipe S 17-2-2 Circular Opening T 17-3 Coolant Pipe Y 17-3-1 Connecting pipe Z 17-3-2 Circular Opening U 17-4 Inner box lid 17-5 Miniature Inline Pump 17-6 Lithium iron phosphate battery mounting chamber 1. Top cover plate 1-1 External thread of the top cover 2 shells 3 Lower housing 3-1 Terminal A 3-2 Terminal B 3-3 Terminal C 3-4 Terminal D 3-5 Terminal E 3-6 Terminal F 4 base plates 5PCB circuit board 5-1 Microcontroller 5-2 Interface Chip 5-3 VMOS transistor 6-1 CAN FD socket M 6-2 CAN FD socket N 6-3 Dust Sensor 6-4 Gas Sensor Detailed Implementation The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0018] It should be noted that the manufacturing process of the soft-pack lithium iron phosphate battery is not described in detail in the embodiments of this specification, because the lithium iron phosphate battery is nothing more than a few major processes such as sheet making, winding, sealing, liquid injection, and formation; of course, busbars, screws or nuts are not shown in the drawings either. The inventors believe that these connection and welding techniques are conventional process operations and are not within the scope of this invention.

[0019] Furthermore, the terms "upper," "lower," "inner," and "outer" used in this specification refer to the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of illustrating this embodiment and do not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "installation," "connection," and "cavity" should be interpreted broadly. For example, the term "connection" can refer to a fixed connection, a detachable connection, a mechanical connection, or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. For simplicity, the specification sometimes uses the abbreviation "lithium iron phosphate battery" as "battery" or "lithium battery." Do not assume these terms are ambiguous, as they refer to the same thing. Similarly, "explosion-proof junction box" is sometimes referred to as "explosion-proof type junction box," which is also unambiguous. Those skilled in the art can readily understand the specific meaning of the above terms in this invention application based on the specific circumstances.

[0020] The implementation method is as follows: A mining explosion-proof lithium iron phosphate battery pack adopts a double-layer structure and includes the following components: an outer shell with heat dissipation ribs and an outer shell cover, an inner box (17) and an inner box cover (17-4), a lithium iron phosphate battery box (14), a micro pipeline pump (17-5), and an explosion-proof junction box. Its key features are as follows: The outer shell cover plate (11) has a built-in reinforcing rib P (11-1) and has fastening screw holes (11-2) for the outer shell cover plate. The outer shell (12) has its own heat dissipation ribs (12-1), and the bottom edge also has an outer shell fixing ear (12-2). The outer shell fixing ear (12-2) has an annular fixing hole (12-3). During installation, after the bolt passes through the annular fixing hole (12-3), the outer shell (12) is connected to the fixing bracket. On the contact surface between the outer shell (12) and the outer shell cover plate (11), there is an outer shell groove (12-5). During installation, the outer shell cover plate (11) is embedded into the outer shell groove (12-5), and then the steel screw is connected to the outer shell (12) through the outer shell cover plate fastening screw hole (11-2) on the outer shell cover plate (11). The outer shell (12) has a connection hole (12-4) for connecting the outer shell and the explosion-proof junction box. An internal thread R (12-6) is engraved at the connection hole (12-4) for connecting the outer shell and the explosion-proof junction box. During installation, the explosion-proof junction box is screwed into the internal thread R (12-6) of the outer shell (12) through the external thread (1-1) of the top cover, thus realizing the installation of the explosion-proof junction box and the outer shell (12). The inner casing (17) of the lithium iron phosphate battery pack is an integral injection-molded composite structure. The inner casing (17) of the lithium iron phosphate battery pack is divided into the following parts: coolant storage tank (16-1), lithium iron phosphate battery mounting chamber (17-6), inner casing cover (17-4), coolant chamber (17-1), which can be embedded in the outer shell (12); In the embodiment, the lithium iron phosphate battery pack consists of 12 independent soft-pack lithium iron phosphate battery boxes (14) connected in series via a busbar, and then installed in the lithium iron phosphate battery mounting chamber (17-6) in the inner box (17) of the lithium iron phosphate battery pack. Each lithium iron phosphate battery box (14) has a battery box positive terminal (14-1) terminal, a battery box negative terminal (14-2) terminal and an exhaust hole (14-3). The coolant storage tank (16-1) is connected to the storage tank sealing cover (16-2). The lithium iron phosphate battery mounting chamber (17-6) and the coolant chamber (17-1) have the following spatial connection relationship in their topological structure: coolant pipes X (17-2) and Y (17-3) are connected to the coolant storage tank (16-1). Coolant pipe X (17-2) is first connected to a micro-pipe pump (17-5), and then connected to the coolant storage tank (16-1). Coolant pipe X (17-2) is connected to the coolant chamber (17-1) through connecting pipe S (17-2-1). Coolant pipe Y (17-3) is connected to the coolant chamber (17-1) through connecting pipe Z (17-3-1). During installation, each lithium iron phosphate battery box (14) is embedded in the lithium iron phosphate battery mounting chamber (17-6). Adjacent to the lithium iron phosphate battery mounting chamber (17-6) is the coolant chamber (17-1). In order to promote the circulation of coolant, the coolant pipe X (17-2) and coolant pipe Y (17-3) are placed with a height difference. Coolant pipe X (17-2) is placed at the lower part of the inner layer box (17) of the lithium iron phosphate battery pack, connected to the micro pipeline pump (17-5) and then connected to the coolant storage tank (16-1). Coolant pipe Y (17-3) is placed at the upper part of the inner layer box (17) of the lithium iron phosphate battery pack and then connected to the coolant storage tank (16-1) to form a position difference for the circulation of coolant. The coolant chamber (17-1) connected to the coolant pipe X (17-2) has a circular opening T (17-2-2) at its lower part, and the coolant chamber (17-1) connected to the coolant pipe Y (17-3) has a circular opening U (17-3-2) at its upper part. In this way, the coolant in the coolant storage tank (16-1) can pass through the connecting pipe S (17-2-1) of the coolant pipe X (17-2) under the push of the micro pipeline pump (17-5), pass through the coolant chamber (17-1), and then through the connecting pipe Z (17-3-1) of the coolant pipe Y (17-3) and return to the coolant storage tank (16-1). During installation, the inner cover plate (17-4) of the lithium iron phosphate battery pack is tightly connected to the inner cover plate (17) of the lithium iron phosphate battery pack by welding glue. That is, the inner cover plate (17-4) of the lithium iron phosphate battery pack just closes the coolant chamber (17-1), but leaves an opening for the lithium iron phosphate battery installation chamber (17-6). The explosion-proof junction box is connected to the explosion-proof junction box connection hole (12-4) through the outer shell. The three-dimensional topology of the explosion-proof junction box consists of an upper cover plate (1), a middle shell (2), a lower shell (3), and a bottom plate (4). A PCB circuit board (5) is installed in the middle shell (2). A microcontroller (5-1), a CAN interface chip (5-2), and a VMOS transistor (5-3) are soldered on the PCB circuit board (5). The lower shell (3) is hexagonal and has six wiring terminals installed on the outside, namely wiring terminal A (3-1), wiring terminal B (3-2), wiring terminal C (3-3), wiring terminal D (3-4), wiring terminal E (3-5), and wiring terminal F (3-6). Among them, the CAN FD socket M (6-1) is screwed into the wiring terminal A (3-1), the CAN FD socket N (6-2) is screwed into the wiring terminal B (3-2), and the dust sensor (6-3) is screwed into the wiring terminal C. (3-3), Screw the gas sensor (6-4) into terminal D (3-4), and connect the remaining two terminals E (3-5) and F (3-6) to the cable respectively. For more detailed claims and technical details of the explosion-proof junction box, please refer to the invention patent filed on the same day: "Dual CAN FD bus explosion-proof junction box with gas and dust sensors". The reference numerals of the two are the same.

[0021] Furthermore, both the outer shell (12) with heat dissipation ribs and the outer shell cover (11) are cast steel parts.

[0022] Furthermore, the inner casing (17) of the lithium iron phosphate battery pack, which is embedded in the outer casing (12), is made of heat-resistant and flame-retardant ABS engineering plastic and is injection molded in one piece.

[0023] Furthermore, the coolant stored in the coolant storage tank (16-1) is a colorless and odorless diol, namely ethylene glycol, which is highly hygroscopic, with a boiling point of 197.5°C and a freezing point of -13°C.

[0024] Furthermore, the explosion-proof junction box has six terminals, two of which are connected to the gas and dust sensors respectively, two of which are connected to the dual CAN FD sockets respectively, and the remaining two terminals are connected to the cable.

[0025] Furthermore, the microcontroller (5-1) of the PCB circuit board (5) in the explosion-proof junction box not only controls the explosion-proof junction box, but also controls the VMOS tube and the micro pipeline pump (17-5). The resident program in the microcontroller (5-1) can be rewritten.

[0026] Furthermore, the inner casing cover (17-4) of the lithium iron phosphate battery pack is tightly connected to the inner casing (17) of the lithium iron phosphate battery pack by a moisture-proof and heat-resistant strong adhesive. This adhesive is an epoxy resin adhesive, which is suitable for filling the gaps between high-strength ABS engineering plastics.

[0027] It should be noted that a related component of the explosion-proof lithium iron phosphate battery pack for mining proposed in this invention, namely the "explosion-proof junction box with dual CAN FD bus and gas and dust sensors," was filed for patent on the same day. Therefore, this application only provides the reference numerals for the explosion-proof junction box associated with the explosion-proof lithium iron phosphate battery pack for mining. If those skilled in the art are interested in the technical details of the explosion-proof junction box or wish to learn more, they can refer to its patent application claims and patent specification. Beneficial effects

[0028] This invention proposes a mine-use explosion-proof lithium iron phosphate battery pack, the most significant feature of which is that it uses an intrinsically safe steel shell with robust protection, allowing it to supply power normally in harsh environments containing explosive mixtures of methane, coal dust, and rock dust.

[0029] The most substantial improvement of this invention is the integration of intrinsic safety, heat dissipation, CAN FD network, sensing, and explosion-proof wiring into one unit. By adding an explosion-proof junction box to the steel housing, it is possible to effectively combine the CAN FD bus, dust concentration sensor, and gas concentration sensor, turning the battery pack of a battery-powered electric locomotive in a mine or underground mine into a mobile monitoring station for dust and gas concentration based on CAN FD bus control, thus implementing cross-industry innovation.

[0030] This invention eliminates the biggest safety hazard of mining power battery packs. It can be specifically designed to deal with vibrations caused by the uneven terrain in mines or tunnels, as well as the intrusion of gas or dust. It can fully withstand multiple safety tests inside the lithium battery pack, including lithium dendrite puncture, short circuit, high temperature, extrusion, drop, and electromagnetic interference, thereby ensuring the system is the most economical and the overall system is optimal.

[0031] This specification uses specific examples to illustrate the principles and operation of the invention, intended only to aid in understanding its core ideas and not to limit its scope. Those skilled in the art will understand that the publication of this patent application has greatly promoted technological exchange and progress, but this does not mean that those skilled in the art can simply implement it without critical thinking, as there is a difference between a patent and a patented product. Furthermore, this invention also employs a balance between technological disclosure and corresponding protection to avoid excessive disclosure that could further diminish its innovative technological value. Clearly, any changes in form and detail made to this invention without departing from the spirit and scope defined in the appended specification are within the scope of protection of this invention.

Claims

1. A mining explosion-proof lithium iron phosphate battery pack, adopting an inner and outer double-layer structure, comprising the following components: an outer shell with heat dissipation ribs and an outer shell cover, an inner box (17) and an inner box cover (17-4) of the lithium iron phosphate battery pack, a lithium iron phosphate battery box (14), a micro pipeline pump (17-5), and an explosion-proof junction box, characterized as follows: The outer shell cover plate (11) has a built-in reinforcing rib P (11-1) and has fastening screw holes (11-2) for the outer shell cover plate. The outer shell (12) has its own heat dissipation ribs (12-1), and the bottom edge also has an outer shell fixing ear (12-2). The outer shell fixing ear (12-2) has an annular fixing hole (12-3). During installation, after the bolt passes through the annular fixing hole (12-3), the outer shell (12) is connected to the fixing bracket. On the contact surface between the outer shell (12) and the outer shell cover plate (11), there is an outer shell groove (12-5). During installation, the outer shell cover plate (11) is embedded into the outer shell groove (12-5), and then the steel screw is connected to the outer shell (12) through the outer shell cover plate fastening screw hole (11-2) on the outer shell cover plate (11). The outer shell (12) has a connection hole (12-4) for connecting the outer shell and the explosion-proof junction box. An internal thread R (12-6) is engraved at the connection hole (12-4) for connecting the outer shell and the explosion-proof junction box. During installation, the explosion-proof junction box is screwed into the internal thread R (12-6) of the outer shell (12) through the external thread (1-1) of the top cover, thus realizing the installation of the explosion-proof junction box and the outer shell (12). The inner casing (17) of the lithium iron phosphate battery pack is an integral injection-molded composite structure. The inner casing (17) of the lithium iron phosphate battery pack is divided into the following parts: coolant storage tank (16-1), lithium iron phosphate battery mounting chamber (17-6), inner casing cover (17-4), coolant chamber (17-1), which can be embedded in the outer shell (12); In the embodiment, the lithium iron phosphate battery pack consists of 12 independent soft-pack lithium iron phosphate battery boxes (14) connected in series via a busbar, and then installed in the lithium iron phosphate battery mounting chamber (17-6) in the inner box (17) of the lithium iron phosphate battery pack. Each lithium iron phosphate battery box (14) has a battery box positive terminal (14-1) terminal, a battery box negative terminal (14-2) terminal and an exhaust hole (14-3). The coolant storage tank (16-1) is connected to the storage tank sealing cover (16-2). The lithium iron phosphate battery mounting chamber (17-6) and the coolant chamber (17-1) have the following spatial connection relationship in their topological structure: coolant pipes X (17-2) and Y (17-3) are connected to the coolant storage tank (16-1). Coolant pipe X (17-2) is first connected to a miniature pipeline pump (17-5), and then connected to the coolant storage tank (16-1). The coolant pipe X (17-2) is connected to pipe S (… 17-2-1) are respectively connected to the coolant chamber (17-1), and the coolant pipe Y (17-3) is connected to the coolant chamber (17-1) through the connecting pipe Z (17-3-1). During installation, each lithium iron phosphate battery box (14) is embedded in the lithium iron phosphate battery mounting chamber (17-6). Adjacent to the lithium iron phosphate battery mounting chamber (17-6) is the coolant chamber (17-1). In order to promote the circulation of coolant, the coolant pipe X (17-2) and coolant pipe Y (17-3) are placed with a height difference. Coolant pipe X (17-2) is placed at the bottom of the inner layer box (17) of the lithium iron phosphate battery pack, connected to the micro pipeline pump (17-5) and then connected to the coolant storage tank (16-1). Coolant pipe Y (17-3) is placed at the top of the inner layer box (17) of the lithium iron phosphate battery pack and then connected to the coolant storage tank (16-1) to form a positional difference for coolant circulation. The coolant chamber (17-1) connected to the coolant pipe X (17-2) has a circular opening T (17-2-2) at its lower part, and the coolant chamber (17-1) connected to the coolant pipe Y (17-3) has a circular opening U (17-3-2) at its upper part. In this way, the coolant in the coolant storage tank (16-1) can pass through the connecting pipe S (17-2-1) of the coolant pipe X (17-2) under the push of the micro pipeline pump (17-5), pass through the coolant chamber (17-1), and then through the connecting pipe Z (17-3-1) of the coolant pipe Y (17-3) and return to the coolant storage tank (16-1). During installation, the inner cover plate (17-4) of the lithium iron phosphate battery pack is tightly connected to the inner cover plate (17) of the lithium iron phosphate battery pack by welding glue. That is, the inner cover plate (17-4) of the lithium iron phosphate battery pack just closes the coolant chamber (17-1), but leaves an opening for the lithium iron phosphate battery installation chamber (17-6). The explosion-proof junction box is connected to the explosion-proof junction box connection hole (12-4) through the outer shell. The three-dimensional topology of the explosion-proof junction box consists of an upper cover plate (1), a middle shell (2), a lower shell (3), and a bottom plate (4). A PCB circuit board (5) is installed in the middle shell (2). A microcontroller (5-1), a CAN interface chip (5-2), and a VMOS transistor (5-3) are soldered on the PCB circuit board (5). The lower shell (3) is hexagonal and has six wiring terminals installed on the outside, namely wiring terminal A (3-1), wiring terminal B (3-2), wiring terminal C (3-3), wiring terminal D (3-4), wiring terminal E (3-5), and wiring terminal F (3-6). Among them, the CAN FD socket M (6-1) is screwed into the wiring terminal A (3-1), the CAN FD socket N (6-2) is screwed into the wiring terminal B (3-2), and the dust sensor (6-3) is screwed into the wiring terminal C. (3-3), screw the gas sensor (6-4) into terminal D (3-4), and connect the remaining two terminals E (3-5) and F (3-6) to the cable respectively.

2. The explosion-proof lithium iron phosphate battery pack for mining as described in claim 1, characterized in that: Both the outer shell (12) with heat dissipation ribs and the outer shell cover (11) are cast steel parts.

3. A mining explosion-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The inner casing (17) of the lithium iron phosphate battery pack, which is embedded in the outer casing (12), is made of heat-resistant and flame-retardant ABS engineering plastic and is injection molded in one piece.

4. A mining explosion-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The coolant stored in the coolant storage tank (16-1) is a colorless and odorless diol, namely ethylene glycol, which is highly hygroscopic, with a boiling point of 197.5℃ and a freezing point of -13℃.

5. A mining explosion-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The explosion-proof junction box has six terminals. Two terminals are connected to the gas and dust sensors, respectively, two terminals are connected to the dual CAN FD sockets, and the remaining two terminals are connected to the cable.

6. A mining explosion-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The microcontroller (5-1) of the PCB circuit board (5) in the explosion-proof junction box not only controls the explosion-proof junction box, but also controls the VMOS tube and the micro pipeline pump (17-5). The resident program in the microcontroller (5-1) can be rewritten.

7. A mining explosion-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The inner casing cover (17-4) of the lithium iron phosphate battery pack is tightly connected to the inner casing (17) of the lithium iron phosphate battery pack by a moisture-proof and heat-resistant strong adhesive. This adhesive is an epoxy resin adhesive, which is suitable for filling the gaps between high-strength ABS engineering plastics.

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