A heating system for an explosion-proof battery

Abstract

This application relates to a heating system for explosion-proof batteries, specifically in the field of battery heating technology. It is used to heat battery modules within a battery box and includes a heat exchange unit and a heat source assembly. The heat exchange unit has two switchable heating modes: centralized heating and uniform heating. The heat exchange unit includes heat exchange tubes, a support frame, and a switching assembly. The switching assembly includes a first switching part and a second switching part. The first switching part includes a switching spring, and the second switching part includes a hydraulic motor, a spool, and a pull rope. The heat source assembly includes a circulation pipe, a heater, and a power pump. The switching assembly can adjust the distribution position of the heat exchange tubes, allowing them to switch between the centralized heating and uniform heating modes. This effectively activates the charging and startup states of the battery modules. The heat source assembly is externally located within the battery box, eliminating the risk of ignition within the battery box. This application effectively activates low-temperature battery modules while meeting the explosion-proof requirements for mining applications.

Description

Technical Field

[0001] This application relates to the technical field of battery heating, and in particular to a heating system for explosion-proof batteries. Background Technology

[0002] Explosion-proof lithium-ion batteries are the core power source for electric explosion-proof trackless rubber-wheeled vehicles, providing a safe and stable power supply for these vehicles in underground coal mines.

[0003] In cold winters, low ambient temperatures can cause lithium-ion battery electrolyte viscosity to increase, internal resistance to rise, and usable capacity to drop sharply, even making it difficult for lithium-ion batteries to discharge normally. To facilitate the normal use of electric explosion-proof trackless rubber-wheeled vehicles in cold winters, additional heating plates or heating films are usually attached to lithium-ion batteries. The heating plates or heating films heat the surface of the lithium-ion batteries to effectively activate the low-temperature lithium-ion batteries. For example, Chinese Patent Publication No. CN116345010A discloses a battery pack heating device, and Chinese Patent Publication No. CN118829023A discloses a battery heating tray.

[0004] In the above-mentioned scheme, due to the presence of gas and coal dust in underground coal mines, the heating plate or heating film attached to the lithium-ion battery can easily become an ignition source, reducing the explosion-proof performance of the explosion-proof lithium-ion battery. Therefore, there is an urgent need for a heating system that can effectively activate low-temperature lithium-ion batteries and meet the explosion-proof requirements for mining. Summary of the Invention

[0005] In order to enable the heating system to effectively activate low-temperature lithium-ion batteries and meet the requirements of explosion-proof mining, this application provides a heating system for explosion-proof batteries.

[0006] This application provides a heating system for explosion-proof batteries, which adopts the following technical solution: A heating system for explosion-proof batteries is used to heat battery modules inside a battery box. The system includes a heat exchange unit and a heat source assembly. The heat exchange unit has two heating modes that can be switched between: centralized heating and uniform heating. The heat exchange unit includes heat exchange tubes, a support frame, and a switching assembly. Four or more heat exchange tubes are arranged in parallel. The heat exchange tubes are slidably mounted on the support frame, which is connected to the inner wall of the battery box. The switching component includes a first switching unit and a second switching unit; The first switching section is connected to all the heat exchange tubes, and the second switching section is mounted on the support frame and connected to the two outermost heat exchange tubes. With the cooperation of the second switching unit, the first switching unit is used to drive all the heat exchange tubes to be distributed below the battery module so that the heat exchange unit switches to the centralized heating mode; With the cooperation of the first switching unit, the second switching unit is used to drive all the heat exchange tubes to be distributed below and on both sides of the battery module so that the heat exchange unit switches to a uniform heating mode. The heat source assembly is located outside the battery box and is connected to all the heat exchange tubes. The heat source assembly is used to circulate and supply the heating fluid medium to the heat exchange tubes.

[0007] Optionally, the first switching unit includes three or more switching springs, which are connected one-to-one between two adjacent heat exchange tubes. When all the switching springs are in their original length state, all the heat exchange tubes are located below the battery module.

[0008] Optionally, the second switching unit includes a hydraulic motor, a spool, and a pull rope. Two hydraulic motors, two spools, and two pull ropes are provided, and they are symmetrically arranged on both sides of the support frame. The hydraulic motor is connected to the support frame, and the spools are connected to the output shafts of the hydraulic motors one by one. One end of the pull rope is connected to and wound around the spool, and the other end of the pull rope is connected to the heat exchange tube located at the edge of the tube. The elastic modulus of the switching springs increases from the switching spring in the center position to the switching spring in the edge position.

[0009] Optionally, the switching component further includes a limiting part, which includes a limiting block and a limiting plate. There are four or more limiting blocks and limiting plates, and each one corresponds to a heat exchange tube. The limiting block is connected to the heat exchange tube, and the limiting plate is connected to the support frame. All the limiting plates are arranged along the sliding path of the heat exchange tube. When the heat exchange unit switches from centralized heating mode to uniform heating mode, the limiting plate is used to restrict the movement position of the corresponding limiting block.

[0010] Optionally, the heat source assembly includes a circulation pipe, a heater, and a power pump. Both ends of the circulation pipe are mounted on the battery box. One end of the circulation pipe is connected to one end of all the heat exchange pipes, and the other end of the circulation pipe is connected to the other end of all the heat exchange pipes. The circulation pipe contains a fluid medium. The heater and the power pump are both mounted on the circulation pipe. The heater is used to heat the fluid medium, and the power pump is used to drive the fluid medium to flow.

[0011] Optionally, it also includes a cold source component, which includes a support frame and a fan. The circulation pipe runs through the support frame, and the portion inside the support frame is serpentine. The fan is connected to the support frame and is positioned directly opposite the serpentine section of the circulation pipe.

[0012] Optionally, the power pump is a bidirectional pump. When heating the battery module, the power pump pumps the fluid medium in the forward direction so that the fluid medium flows directly into the heat exchange tube. When cooling the battery module, the power pump pumps the fluid medium in the reverse direction so that the fluid medium first flows through the serpentine section of the circulation pipe and then flows into the heat exchange tube.

[0013] Optionally, the fan can blow air in both directions. When the fan blows air in the forward direction, the air blows through the circulation pipe in a direction away from the battery box. When the fan blows air in the reverse direction, the air blows through the circulation pipe in a direction towards the battery box.

[0014] Optionally, the second switching unit, heater, power pump, and fan are electrically connected to a first controller. The first controller is used to control the second switching unit, heater, power pump, and fan to perform actions so that the battery module switches between three modes: uniform heating, concentrated heating, and uniform cooling.

[0015] Optionally, it also includes a temperature control component, which includes a first temperature sensor, a second temperature sensor, and a second controller. The first temperature sensor and the second temperature sensor are respectively located at both ends of the circulation tube. The fluid medium flows into the heat exchange tube after passing through the first temperature sensor. The first temperature sensor is used to output a first temperature signal of the fluid medium, and the second temperature sensor is used to output a second temperature signal of the fluid medium. The battery module is electrically connected to a battery management system. The battery management system is used to output the third temperature signal and health signal of the battery module. The second controller is electrically connected to the first temperature sensor, the second temperature sensor, the heater, and the battery management system. The second controller responds to the first temperature signal of the first temperature sensor, the second temperature signal of the second temperature sensor, the third temperature signal of the battery management system, and the health signal of the battery management system. The second controller is used to control the heating of the fluid medium by the heater.

[0016] In summary, this application includes at least one of the following beneficial technical effects: This application discloses a heating system for explosion-proof batteries, comprising a heat exchange unit and a heat source assembly. An external heater and power pump circulate a heating fluid medium within the heat exchange tubes, stably heating the battery module. During charging, a hydraulic motor rewinds a rope to drive the edge heat exchange tubes to slide, which in turn drive the remaining heat exchange tubes to slide, distributing all heat exchange tubes below and to the sides of the battery module, thus ensuring uniform heating. During startup, the hydraulic motor unwinds the rope, and under the force of a switching spring, all heat exchange tubes are distributed below the battery module, enabling rapid and concentrated heating. Therefore, by using an external heat source assembly and adjusting the distribution of the heat exchange tubes, this application effectively activates low-temperature battery modules while meeting the explosion-proof requirements for mining applications. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a schematic diagram of the battery module structure; Figure 3 This is a schematic diagram of the heat exchange tube in centralized heating mode; Figure 4 yes Figure 3 Enlarged view at point A in the middle; Figure 5 This is a schematic diagram of the heat exchange tube in a uniform heating mode. Figure 6 yes Figure 3 A magnified view of point B in the middle.

[0018] Explanation of reference numerals in the attached figures: 1. Battery box; 2. Battery module; 21. Battery module; 3. Heat exchange tube; 31. Slider; 32. Support shaft; 4. Support frame; 41. Slide rail; 5. Switching assembly; 51. First switching part; 511. Switching spring; 52. Second switching part; 521. Hydraulic motor; 522. Bollard; 523. Pull rope; 53. Limiting part; 531. Limiting block; 532. Limiting plate; 6. Heat source assembly; 61. Circulation pipe; 62. Heater; 63. Power pump; 7. Cold source assembly; 71. Support frame; 72. Fan; 8. First controller; 9. Temperature control assembly; 91. First temperature sensor; 92. Second temperature sensor; 93. Second controller. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0020] This application discloses a heating system for explosion-proof batteries. (Refer to...) Figures 1-3 A heating system for explosion-proof batteries is used to heat battery modules 2 inside a battery box 1. The system includes a heat exchange unit and a heat source assembly 6. The heat exchange unit has two heating modes that can be switched between: centralized heating and uniform heating. The heat exchange unit includes a heat exchange tube 3, a support frame 4, and a switching assembly 5.

[0021] Reference Figures 2-4 There are four or more heat exchange tubes 3 arranged in parallel. Both ends of the heat exchange tubes 3 are slidably mounted on the support frame 4. The support frame 4 is U-shaped and fixed to the inner wall of the battery box 1. Both ends of the heat exchange tubes 3 are fixedly connected to sliders 31. The sliders 31 are slidably mounted in the slide rails 41 provided on the support frame 4. The sliders 31 and the slide rails 41 form a sliding connection structure between the heat exchange tubes 3 and the support frame 4.

[0022] Reference Figure 2 and Figure 3 In this embodiment, the battery module 2 is composed of multiple battery modules 21, each of which is a lithium-ion battery. Multiple heat exchange units are provided, each corresponding to a battery module 21. The battery modules 21 are located inside the support frame 4, and the heat exchange tubes 3 of the multiple heat exchange units are connected sequentially through flexible hoses.

[0023] Reference Figure 3 The switching component 5 includes a first switching part 51 and a second switching part 52; in this embodiment, the switching component 5 is provided in two sets, and is located at both ends of the heat exchange tube 3 respectively.

[0024] The first switching unit 51 is connected to all the heat exchange tubes 3, and the second switching unit 52 is mounted on the support frame 4 and connected to the two outermost heat exchange tubes 3.

[0025] With the cooperation of the second switching unit 52, the first switching unit 51 is used to drive all the heat exchange tubes 3 to be distributed below the battery module 2 so that the heat exchange unit switches to the centralized heating mode.

[0026] Reference Figure 5 With the cooperation of the first switching unit 51, the second switching unit 52 is used to drive all the heat exchange tubes 3 to be distributed below and on both sides of the battery module 2 so that the heat exchange unit switches to a uniform heating mode.

[0027] Reference Figure 1 and Figure 2 The heat source component 6 is located outside the battery box 1 and is connected to all the heat exchange tubes 3. The heat source component 6 is used to circulate and supply the heating fluid medium to the heat exchange tubes 3. In this embodiment, the fluid medium is a 50% ethylene glycol aqueous solution.

[0028] In use, the heat source component 6 outside the battery box 1 can circulate and supply the heated fluid medium to the heat exchange tube 3. When the heated fluid medium flows through the heat exchange tube 3, it can exchange heat with the battery module 21 to heat the battery module 21 and activate it. Since the heat source component 6 is located outside the battery box 1, there is a physical isolation between the heat source component 6 and the battery module 21, making it less likely for the heat source component 6 to become an ignition source for the battery module 21, eliminating the risk of ignition inside the battery box 1. Moreover, compared with heating plates and heating films, the heating effect of the fluid medium on the battery module 21 is more stable and less likely to cause local high temperature situations, so that this application can meet the requirements of mine explosion protection while heating the battery module 2.

[0029] During charging, the first switching unit 51 cooperates with the second switching unit 52 to enable the second switching unit 52 to drive all the heat exchange tubes 3 to slide, so that all the heat exchange tubes 3 can be distributed below and on both sides of the battery module 21 to heat the battery module 21 evenly. This makes it easier for the overall temperature of the battery module 21 to rise evenly, avoiding local heating that would result in poor charging performance, and thus effectively activating the battery module 21 for charging.

[0030] During startup, the second switching unit 52 works in conjunction with the first switching unit 51 to enable the first switching unit 51 to drive all the heat exchange tubes 3 to be distributed below the battery module 21, so that the battery module 21 can be heated in a concentrated manner, making it easy for the bottom of the battery module 21 to heat up quickly, and making it easy for the battery module 21 to heat up and discharge quickly, thereby effectively activating the battery module 2 to discharge.

[0031] Based on the above analysis, by adjusting the distribution position of the heat exchange tubes 3, the battery module 2 can be heated in a concentrated and rapid manner and heated in a dispersed and uniform manner, so that the battery module 2 can be heated and charged evenly and discharged quickly. Since the heat source component 6 is placed outside the battery box 1, this application can effectively activate the low-temperature battery module 2 and meet the requirements of explosion-proof mining.

[0032] Specifically, refer to Figure 3 and Figure 4 The first switching unit 51 includes three or more switching springs 511, which are connected one-to-one between two adjacent heat exchange tubes 3. When all the switching springs 511 are in their original length state, all the heat exchange tubes 3 are located below the battery module 2.

[0033] With the cooperation of the second switching part 52, the switching spring 511 can drive the two heat exchange tubes 3 connected to it to slide towards each other through its elastic force. Under the combined action of all the switching springs 511, all the heat exchange tubes 3 can slide to the bottom of the battery module 21, thereby facilitating the switching of the heat exchange unit to the centralized heating mode.

[0034] Specifically, refer to Figure 6 The second switching unit 52 includes a hydraulic motor 521, a spool 522, and a pull rope 523.

[0035] Reference Figure 3 and Figure 6 Two hydraulic motors 521, two spools 522, and two pull ropes 523 are provided, and they are symmetrically arranged on both sides of the support frame 4. The hydraulic motors 521 are fixed to the support frame 4. The spools 522 are fixed to the output shafts of the hydraulic motors 521. One end of the pull ropes 523 is fixed to and wound around the spools 522. The other end of the pull ropes 523 is connected to the heat exchange tubes 3 located at the edge of the tubes. The elastic modulus of the switching springs 511 increases from the central switching spring to the edge switching spring.

[0036] The hydraulic motor 521 can drive the spool 522 to wind up the pull rope 523. The pull rope 523 can drive the heat exchange tube 3 at the edge to slide. Since the elastic modulus of the switching spring 511 at the center position is the smallest, the distance between the two heat exchange tubes 3 connected to the switching spring 511 at the center position increases first. Then, from the center position to the edge position, the distance between two adjacent heat exchange tubes 3 increases sequentially, so that all the heat exchange tubes 3 can be distributed below and on both sides of the battery module 21, thereby facilitating the switching of the heat exchange unit to a uniform heating mode.

[0037] Specifically, refer to Figure 3 and Figure 4 The switching component 5 also includes a limiting part 53, which includes a limiting block 531 and a limiting plate 532.

[0038] There are four or more limiting blocks 531 and limiting plates 532, and each one corresponds to a heat exchange tube 3. The limiting blocks 531 are connected to the heat exchange tube 3, and the limiting plates 532 are fixed to the support frame 4. All the limiting plates 532 are arranged along the sliding path of the heat exchange tube 3. When the heat exchange unit switches from centralized heating mode to uniform heating mode, the limiting plates 532 are used to limit the movement position of the corresponding limiting blocks 531.

[0039] In this embodiment, a support shaft 32 is fixedly connected to the slider 31, and a limiting block 531 is fixedly sleeved on the support shaft 32. From the center position to the edge position, the size of the limiting block 531 gradually decreases, and the size of the limiting plate 532 gradually increases. The limiting plate 532 can prevent the corresponding limiting block 531 from sliding past itself. The switching spring 511 is fixedly connected to the limiting block 531. The switching spring 511 is connected to the heat exchange tube 3 through the limiting block 531, the support shaft 32, and the slider 31. The pull rope 523 is fixedly connected to the limiting block 531 at the edge position. The pull rope 523 is connected to the heat exchange tube 3 through the limiting block 531, the support shaft 32, and the slider 31.

[0040] By limiting the sliding position of the corresponding limiting block 531 by the limiting plate 532, when the heat exchange unit switches to uniform heating mode, each heat exchange tube 3 can be stably slid to the preset position, so that the uniform heating effect of the heat exchange tube 3 is stable and reliable.

[0041] Specifically, refer to Figure 1 The heat source component 6 includes a circulation pipe 61, a heater 62, and a power pump 63.

[0042] Reference Figure 1 and Figure 2Both ends of the circulation pipe 61 are fixedly installed on the battery box 1. One end of the circulation pipe 61 is connected to one end of all the heat exchange pipes 3, and the other end of the circulation pipe 61 is connected to the other end of all the heat exchange pipes 3. In this embodiment, an explosion-proof sealing joint is provided at the connection between the circulation pipe 61 and the battery box 1. One end of the circulation pipe 61 is connected to all the heat exchange pipes 3 of the heat exchange unit at the beginning position, and the other end of the circulation pipe 61 is connected to all the heat exchange pipes 3 of the heat exchange unit at the end position.

[0043] Reference Figure 1 The circulation pipe 61 contains a fluid medium. The heater 62 and the power pump 63 are both installed on the circulation pipe 61. The heater 62 is used to heat the fluid medium, and the power pump 63 is used to drive the fluid medium to flow. In this embodiment, the heater 62 is an explosion-proof PTC heater, and the power pump 63 is an explosion-proof water pump.

[0044] The heater 62 can heat the fluid medium through the circulation pipe 61, and the power pump 63 can pump the heated fluid medium into the heat exchange pipe 3. During the circulation of the fluid medium, the fluid medium can circulate and heat the battery module 2, thereby enabling the battery module 2 to be heated stably.

[0045] Reference Figure 1 and Figure 2 In order to cool down the battery module 2 that generates heat due to driving the vehicle, the heating system for explosion-proof batteries in this application also includes a cold source component 7.

[0046] Reference Figure 1 The cold source component 7 includes a support frame 71 and a fan 72. The circulation pipe 61 is fixedly installed on the support frame 71. The part of the circulation pipe 61 inside the support frame 71 is serpentine. The fan 72 is fixedly connected to the support frame 71 and is positioned directly opposite the serpentine section of the circulation pipe 61.

[0047] When the battery module 2 discharges to drive the vehicle, the battery module 2 will generate heat. In the cold winter, the underground temperature is usually higher than the ground temperature, and the heat dissipation effect of the battery module 2 is poor. At this time, the heater 62 is stopped, and the fan 72 is started to blow air into the serpentine section of the circulation pipe 61, so that the fluid medium in the circulation pipe 61 can be cooled by air. The cooled fluid medium can flow into the heat exchange pipe 3 under the action of the power pump 63. The cooled fluid medium can absorb the heat of the battery module 2, so that this application can not only heat the battery module 2, but also cool the battery module 2.

[0048] Reference Figure 1 and Figure 2In order to improve the cooling effect of the fluid medium on the battery module 2, the power pump 63 is a bidirectional pump. When heating the battery module 2, the power pump 63 pumps the fluid medium in the forward direction so that the fluid medium flows directly into the heat exchange tube 3; when cooling the battery module 2, the power pump 63 pumps the fluid medium in the reverse direction so that the fluid medium first flows through the serpentine section of the circulation pipe 61 and then flows into the heat exchange tube 3.

[0049] When heating the battery module 2, the heated fluid medium can flow into the heat exchange tube 3 at the fastest speed, reducing the loss of heat energy of the fluid medium in the environment, thereby enhancing the heating effect of the fluid medium on the battery module 2; when cooling the battery module 2, the fluid medium is cooled by air in the serpentine section of the circulation tube 61, and the cooled fluid medium can flow into the heat exchange tube 3 at the fastest speed, reducing the loss of cold energy of the fluid medium in the environment, thereby enhancing the cooling effect of the fluid medium on the battery module 2.

[0050] Reference Figure 1 and Figure 2 In order to improve the heating effect on the battery module 2, the fan 72 can blow air in both directions. When the fan 72 blows air in the forward direction, the air blows through the circulation pipe 61 in the direction away from the battery box 1; when the fan 72 blows air in the reverse direction, the air blows through the circulation pipe 61 in the direction towards the battery box 1.

[0051] The forward airflow of fan 72 allows air to blow away from the battery box 1 through the circulation pipe 61, enabling the air to carry the heat energy of the fluid medium away from the battery box 1, thereby helping to cool the battery module 2; the reverse airflow of fan 72 allows air to blow towards the battery box 1 through the circulation pipe 61, enabling the air to carry the heat energy of the fluid medium closer to the battery box 1, increasing the ambient temperature around the battery box 1, thereby helping to heat the battery module 2.

[0052] Reference Figure 1 and Figure 3 In order to facilitate the switching of battery module 2 between different modes, the second switching unit 52, heater 62, power pump 63 and fan 72 are electrically connected to the first controller 8. The first controller 8 is used to control the second switching unit 52, heater 62, power pump 63 and fan 72 to perform actions so that the battery module 2 can switch between three modes: uniform heating, concentrated heating and uniform cooling.

[0053] The first controller 8 controls the hydraulic motor 521 of the second switching unit 52 to wind up the pull rope 523, controls the heater 62 to heat the fluid medium, and controls the power pump 63 to pump the fluid medium, so that the battery module 2 can be in a uniform heating mode, which is conducive to the charging of the battery module 2. In this embodiment, in the uniform heating mode, the first controller 8 controls the power pump 63 to pump the fluid medium in the forward direction and controls the fan 72 to blow air in the reverse direction.

[0054] The first controller 8 controls the hydraulic motor 521 of the second switching unit 52 to unwind the rope 523, controls the heater 62 to heat the fluid medium, and controls the power pump 63 to pump the fluid medium, so that the battery module 2 can be in a centralized heating mode, which is conducive to the start-up of the battery module 2. In this embodiment, in the centralized heating mode, the first controller 8 controls the power pump 63 to pump the fluid medium in the forward direction and controls the fan 72 to blow air in the reverse direction.

[0055] The first controller 8 controls the hydraulic motor 521 of the second switching unit 52 to wind up the pull rope 523, controls the heater 62 to stop heating the fluid medium, controls the power pump 63 to pump the fluid medium, and controls the fan 72 to blow air, so that the battery module 2 can be in a uniform cooling mode, which is beneficial to the cooling of the battery module 2. In this embodiment, in the uniform cooling mode, the first controller 8 controls the power pump 63 to pump the fluid medium in reverse and controls the fan 72 to blow air in the forward direction.

[0056] Reference Figure 1 and Figure 2 In order to improve the safety of heating the battery module 2, the heating system for explosion-proof batteries in this application further includes a temperature control component 9, which includes a first temperature sensor 91, a second temperature sensor 92, and a second controller 93.

[0057] The first temperature sensor 91 and the second temperature sensor 92 are respectively disposed at both ends of the circulation pipe 61. When heating the battery module 2, the fluid medium flows through the first temperature sensor 91 and then into the heat exchange pipe 3. The first temperature sensor 91 is used to output the first temperature signal of the fluid medium, and the second temperature sensor 92 is used to output the second temperature signal of the fluid medium.

[0058] Battery module 2 is electrically connected to a battery management system, which is existing technology and is not shown in the figure. The battery management system is used to output a third temperature signal and a health signal of battery module 2. The health signal includes the cell voltage value, insulation resistance value, and CAN communication status.

[0059] Reference Figure 1 The second controller 93 is electrically connected to the first temperature sensor 91, the second temperature sensor 92, the heater 62, and the battery management system. The second controller 93 responds to the first temperature signal from the first temperature sensor 91, the second temperature signal from the second temperature sensor 92, the third temperature signal from the battery management system, and the health signal from the battery management system. The second controller 93 is used to control the heating of the fluid medium by the heater 62.

[0060] The first temperature signal is denoted as T1, the second temperature signal as T2, the third temperature signal as T3, the individual voltage value of the health signal as V0, and the insulation resistance value of the health signal as R.

[0061] When T2 < 45℃ and T3 < 5℃, the second controller 93 controls the heater 62 to heat the fluid medium.

[0062] When T2≥50℃ or T3>15℃, the second controller 93 controls the heater 62 to stop heating the fluid medium.

[0063] When T2-T1 > 8℃, the second controller 93 controls the heater 62 to reduce the heating power.

[0064] When V0 < 2.5V or V0 > 4.25V, R < 500Ω / V, or CAN communication is interrupted for more than 3 cycles, the second controller 93 controls the heater 62 to stop heating the fluid medium.

[0065] Under the above control logic, this application not only ensures the effectiveness of low-temperature activation of battery module 2, but also reduces the risk of thermal runaway.

[0066] The implementation principle of a heating system for an explosion-proof battery according to an embodiment of this application is as follows: During charging, the hydraulic motor 521 winds up the pull rope 523 to drive the heat exchange tube 3 at the edge to slide. Under the elastic force of all the switching springs 511, all the heat exchange tubes 3 can be distributed below and on both sides of the battery module 2. The external heat source component 6 supplies the heating fluid medium to the heat exchange tubes 3, and the heating fluid medium uniformly heats the battery module 2.

[0067] During startup, the hydraulic motor 521 unwinds the rope 523. Driven by the elasticity of all the switching springs 511, all the heat exchange tubes 3 can be distributed below the battery module 2. The external heat source component 6 supplies the heating fluid medium to the heat exchange tubes 3. The heated fluid medium concentrates the heating of the battery module 2. Thus, this application can effectively activate the low-temperature battery module 2 and meet the requirements of explosion-proof mining.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heating system for explosion-proof batteries, used to heat battery modules (2) inside a battery box (1), characterized in that: It includes a heat exchange unit and a heat source assembly (6). The heat exchange unit has two heating modes that can be switched between: centralized heating and uniform heating. The heat exchange unit includes heat exchange tubes (3), a support frame (4) and a switching assembly (5). There are four or more heat exchange tubes (3) arranged in parallel. The heat exchange tubes (3) are slidably arranged on the support frame (4). The support frame (4) is connected to the inner wall of the battery box (1). The switching component (5) includes a first switching part (51) and a second switching part (52); The first switching part (51) is connected to all the heat exchange tubes (3), and the second switching part (52) is mounted on the support frame (4) and connected to the two outermost heat exchange tubes (3); With the cooperation of the second switching unit (52), the first switching unit (51) is used to drive all the heat exchange tubes (3) to be distributed below the battery module (2) so that the heat exchange unit is switched to the centralized heating mode. With the cooperation of the first switching unit (51), the second switching unit (52) is used to drive all the heat exchange tubes (3) to be distributed below and on both sides of the battery module (2) so that the heat exchange unit switches to uniform heating mode. The heat source assembly (6) is located outside the battery box (1) and is connected to all the heat exchange tubes (3). The heat source assembly (6) is used to circulate and supply the heating fluid medium to the heat exchange tubes (3).

2. The heating system for an explosion-proof battery according to claim 1, characterized in that: The first switching part (51) includes three or more switching springs (511). The switching springs (511) are connected one-to-one between two adjacent heat exchange tubes (3). When all the switching springs (511) are in their original length state, all the heat exchange tubes (3) are located below the battery module (2).

3. A heating system for an explosion-proof battery according to claim 2, characterized in that: The second switching unit (52) includes a hydraulic motor (521), a bobbin (522), and a pull rope (523). Two hydraulic motors (521), two bobbins (522), and two pull ropes (523) are provided and are symmetrically arranged on both sides of the support frame (4). The hydraulic motor (521) is connected to the support frame (4). The bobbins (522) are connected to the output shaft of the hydraulic motor (521) in a corresponding manner. One end of the pull rope (523) is connected to and wound around the bobbin (522) in a corresponding manner. The other end of the pull rope (523) is connected to the heat exchange tube (3) located at the edge position. The elastic modulus of the switching springs (511) increases from the switching spring (511) in the central position to the switching spring (511) in the edge position.

4. A heating system for an explosion-proof battery according to claim 3, characterized in that: The switching component (5) also includes a limiting part (53), which includes a limiting block (531) and a limiting plate (532). There are four or more limiting blocks (531) and limiting plates (532), and each one corresponds to a heat exchange tube (3). The limiting block (531) is connected to the heat exchange tube (3), and the limiting plate (532) is connected to the support frame (4). All the limiting plates (532) are arranged along the sliding path of the heat exchange tube (3). When the heat exchange unit switches from centralized heating mode to uniform heating mode, the limiting plate (532) is used to restrict the movement position of the corresponding limiting block (531).

5. A heating system for an explosion-proof battery according to claim 1, characterized in that: The heat source assembly (6) includes a circulation pipe (61), a heater (62), and a power pump (63). Both ends of the circulation pipe (61) are mounted on the battery box (1). One end of the circulation pipe (61) is connected to one end of all the heat exchange pipes (3), and the other end of the circulation pipe (61) is connected to the other end of all the heat exchange pipes (3). The circulation pipe (61) contains a fluid medium. The heater (62) and the power pump (63) are both mounted on the circulation pipe (61). The heater (62) is used to heat the fluid medium, and the power pump (63) is used to drive the fluid medium to flow.

6. A heating system for an explosion-proof battery according to claim 5, characterized in that: It also includes a cold source component (7), which includes a support frame (71) and a fan (72). The circulation pipe (61) passes through the support frame (71), and the part located inside the support frame (71) is serpentine. The fan (72) is connected to the support frame (71), and the fan (72) is positioned directly opposite the serpentine section of the circulation pipe (61).

7. A heating system for an explosion-proof battery according to claim 6, characterized in that: The power pump (63) is a bidirectional pump. When heating the battery module (2), the power pump (63) pumps the fluid medium in the forward direction so that the fluid medium flows directly into the heat exchange tube (3); when cooling the battery module (2), the power pump (63) pumps the fluid medium in the reverse direction so that the fluid medium first flows through the serpentine section of the circulation pipe (61) and then flows into the heat exchange tube (3).

8. A heating system for an explosion-proof battery according to claim 7, characterized in that: The fan (72) can blow air in both directions. When the fan (72) blows air in the forward direction, the air blows through the circulation pipe (61) in the direction away from the battery box (1). When the fan (72) blows air in the reverse direction, the air blows through the circulation pipe (61) in the direction towards the battery box (1).

9. A heating system for an explosion-proof battery according to claim 6, characterized in that: The second switching unit (52), heater (62), power pump (63) and fan (72) are electrically connected to a first controller (8). The first controller (8) is used to control the second switching unit (52), heater (62), power pump (63) and fan (72) to perform actions so that the battery module (2) switches between three modes: uniform heating, concentrated heating and uniform cooling.

10. A heating system for an explosion-proof battery according to claim 5, characterized in that: It also includes a temperature control component (9), which includes a first temperature sensor (91), a second temperature sensor (92), and a second controller (93). The first temperature sensor (91) and the second temperature sensor (92) are respectively set at both ends of the circulation pipe (61). After the fluid medium flows through the first temperature sensor (91), it flows into the heat exchange tube (3). The first temperature sensor (91) is used to output the first temperature signal of the fluid medium, and the second temperature sensor (92) is used to output the second temperature signal of the fluid medium. The battery module (2) is electrically connected to the battery management system. The battery management system is used to output the third temperature signal and health signal of the battery module (2). The second controller (93) is electrically connected to the first temperature sensor (91), the second temperature sensor (92), the heater (62) and the battery management system. The second controller (93) responds to the first temperature signal of the first temperature sensor (91), the second temperature signal of the second temperature sensor (92), the third temperature signal of the battery management system and the health signal of the battery management system. The second controller (93) is used to control the heating of the fluid medium by the heater (62).

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