Temperature control device for battery pack group of battery changing vehicle

Abstract

The temperature control device comprises a plurality of temperature control plates which are arranged on a mounting frame at the bottom of the vehicle in a lifting and sliding mode, a plurality of guide columns are installed on the mounting frame at the bottom of the vehicle in a relatively vertical and sliding mode, and the upper ends and the lower ends of the guide columns are fixedly connected with a movable frame and the temperature control plates respectively; a pressing structure and a beam body are arranged on the vehicle bottom installation frame, a pressure buffering gasket is arranged between the beam body and the movable frame, and when the beam body is close to the movable frame, the pressure buffering gasket is pressed to deform. According to the device, the whole temperature control plate is divided into small blocks to be arranged at the bottom of the vehicle body, the pressing mechanism is arranged to drive the beam body to apply downward pressure, it is guaranteed that each independent temperature control plate can be tightly pressed and attached to the surface of the battery pack, and the problem that when the temperature control assembly is fixed to the battery pack, the service life of the temperature control assembly is limited due to the fact that a pipeline is repeatedly pulled and inserted is solved; meanwhile, it is still guaranteed that the temperature control assembly plate can be tightly attached to the surface of the battery pack.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery pack temperature control equipment, and specifically relates to a temperature control device for a battery pack of a battery-swap vehicle. Background Art

[0002] Electric vehicles are the development direction of new energy vehicles. They use battery packs to store electrical energy as a power source to drive the vehicle. In order to ensure a certain total power and output voltage requirements, electric vehicles need to be equipped with a certain number of battery packs, and the battery packs are connected through copper bars to form battery modules. In order to improve the safety of the battery modules, the battery modules are encapsulated into a shell to form a battery pack. The charging and discharging heat of the battery modules in the battery pack causes the temperature of the battery pack to rise. Excessive temperature will have an adverse effect on the performance and service life of the battery, and may even cause thermal runaway and endanger personal safety. Therefore, the battery pack in use must be cooled and cooled. At the same time, in areas with lower temperatures, the charging efficiency of the battery pack is lower when the temperature is lower. Therefore, the battery pack needs to be preheated in advance to ensure that it has better charging efficiency and achieves the effect of fast charging. Therefore, it is necessary to add temperature control devices to the battery bottom compartment, battery exchange cabinet and other facilities where the battery pack is placed and needs to be charged and discharged.

[0003] At present, battery-swap electric vehicles complete the battery swap operation by disassembling and replacing the entire battery pack under the vehicle. At the same time, in order to control the temperature of the battery pack, a water-cooling plate that can fit tightly with the surface of the battery pack needs to be set. In order to make the entire water-cooling plate fit tightly with the surface of the battery pack, the water-cooling plate is directly laid relatively fixedly on the surface of the battery module;

[0004] During the battery replacement process, when the battery pack is installed on the bottom of the vehicle body, the pipe joint of the water cooling plate is connected to the vehicle body water pump to form a circulating water circuit with the water cooling plate on the battery pack. However, in actual applications, since the water cooling pipe needs to be connected when replacing the battery pack, on the one hand, it increases the difficulty of battery replacement and limits the efficiency of battery replacement operation. On the other hand, the water cooling pipe is plugged and unplugged many times during the battery replacement process. Due to the impact of multiple instantaneous water pressures, it is easy to cause damage to the pipe, affecting the service life of the temperature control component. Therefore, the temperature control device of the entire battery pack needs to be redesigned. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature control device for a battery pack of a battery-swap vehicle for use, so as to solve the problems of the service life of the water cooling component and the close fit between the water cooling plate and the surface of the battery pack raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a temperature control device for a battery pack of a battery-swap vehicle, comprising a plurality of temperature control plates that are lifted and slidably arranged on a mounting frame at the bottom of the vehicle, a plurality of guide pillars are relatively vertically slidably installed on the mounting frame at the bottom of the vehicle, and the upper and lower ends of the guide pillars are fixedly connected to a movable frame and a temperature control plate respectively;

[0007] The vehicle bottom mounting frame is provided with a clamping structure and a beam body driven by the clamping structure to move downward toward the movable frame. A pressure-absorbing gasket is provided between the beam body and the movable frame. When the beam body and the movable frame are close to each other, the pressure-absorbing gasket is compressed and deformed.

[0008] Preferably, the clamping structure includes a linear drive unit fixedly mounted on the battery compartment, a drive rod driven to translate by the linear drive unit, and a rod mounted on the beam body;

[0009] The side surface on which the driving rod and the rod member are in relative sliding contact is arranged as an inclined surface, and when the rod member is in translation, the rod member always keeps in contact with the inclined surface.

[0010] Preferably, the rod is rotatably mounted on the beam body via a connecting seat, and when the rod is translated, the rod rolls along the inclined surface.

[0011] Preferably, the guide column is sleeved with a return spring for pushing the movable frame to drive the temperature control plate to rise away from the surface of the battery pack.

[0012] Preferably, movable frames are correspondingly arranged at both ends of each beam body, and the two movable frames are symmetrically arranged with the pressure part of the clamping mechanism on the beam body.

[0013] Preferably, the movable frame is in an I-shape, and the force application point of the beam body on the movable frame is located in the middle of the longitudinal rod of the movable frame;

[0014] The guide pillars are symmetrically arranged on the temperature control board, and the two ends of the crossbar of the movable frame are respectively fixedly connected to the symmetrical guide pillars.

[0015] Preferably, a guide seat with a guide groove in the middle is fixedly mounted on the movable frame, the beam body is slidably connected to the guide seat through the guide groove, the guide groove is consistent with the width of the beam body, and a pressure-reducing gasket is arranged at the bottom of the guide groove.

[0016] Preferably, bolts are relatively vertically fixedly installed on the beam body, and the other ends of the bolts pass through the holes reserved on the pressure-reducing gasket, the guide seat and the movable frame in sequence.

[0017] Preferably, a scraper is provided on the edge of the slot entrance close to the temperature control plate.

[0018] Preferably, the temperature control plate is a plate with a flow channel arranged inside, and the water outlet and water inlet of the internal flow channel are respectively connected to the main pipeline on the battery compartment through a hose to form a circulating water circuit.

[0019] Preferably, the pressure relief gasket is in the shape of a truncated cone and has a height of 10-15 mm.

[0020] The technical effects and advantages of the present invention are as follows: the temperature control device of the battery pack of the battery-swap vehicle,

[0021] 1. Set the temperature control board and temperature control equipment such as pipelines and water pumps at the bottom of the vehicle body, instead of laying the temperature control board relatively fixedly on the battery pack and separating it from the pipeline. Avoid the impact pressure problem caused by the need to dock the pipeline every time when changing the battery. In addition, the entire temperature control board in the traditional temperature control equipment is divided into separate small pieces, and the clamping mechanism drives each small piece to drop synchronously to avoid contact with the battery pack. Ensure the output of appropriate pressure to ensure that the small temperature control boards in each position can fit tightly with the battery pack, thereby ensuring heat dissipation efficiency, while eliminating the need for pipeline docking, reducing the difficulty of battery replacement operations, and speeding up battery replacement efficiency.

[0022] 2. To solve the problem that when the temperature control board is divided into several independent small pieces and driven to stick to various areas of the battery pack, the temperature control board at each position is subjected to uneven force, the degree of fit of the temperature control board at some positions is quite different, and some positions are over-pressurized;

[0023] First, the structure of the pressing mechanism is designed. The inclined surface of the driving rod cooperates with the rod to drive the beam body to press down smoothly. On the one hand, it can prevent the temperature control board from impacting the battery pack and causing damage due to excessive downward pressure. On the other hand, the beam body is pressed down smoothly, and the output pressure is greater. The temperature control board is driven by the movable frame to descend relatively smoothly along the guide column, which can avoid the temperature control board from tilting and jamming during the descent process, and completely cover the surface of the battery pack.

[0024] The beam and the movable frame are set to a separate structure. When the beam is pressed down onto the movable frame, the downward pressure of the beam is supported and absorbed by the deformation of the pressure relief gasket, so as to prevent the movable frame from outputting excessive rigid pressure to the battery pack and causing hard damage. This allows the clamping mechanism to output greater pressure to ensure that the temperature control board at each position fits the battery pack, without causing excessive pressure at some positions and causing damage to the battery pack;

[0025] Optimize the structure of the movable frame and the position where the beam applies force to the movable frame, so as to better balance the pressure output by the downward pressure mechanism. The downward pressure of each temperature control board is relatively uniform, further ensuring that the temperature control board at each position fits tightly with the battery pack and the pressure is moderate.

[0026] In addition, a scraper is provided at the entrance of the battery compartment slot to remove debris and dust on the contact surface between the battery pack and the temperature control board, so as to prevent the temperature control board and the battery pack from being blocked by debris and affecting the heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0029] Figure 3 It is a schematic diagram of the coordination between the beam body and the movable frame;

[0030] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0031] Figure 5 It is a structural schematic diagram of the clamping mechanism;

[0032] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0033] Figure 7 Schematic diagram of the cooperation between the driving rod and the beam body.

[0034] In the figure: 1. Mounting frame; 2. Hose; 3. Temperature control board;

[0035] 4. Compression structure; 410. Linear drive unit; 420. Drive rod;

[0036] 5. movable frame; 510. horizontal bar; 520. vertical bar;

[0037] 6. Guide column; 7. Spring; 8. Beam; 9. Pressure relief gasket; 10. Rod;

[0038] 11. Inclined surface; 12. Connecting seat; 13. Guide seat; 14. Guide groove; 15. Bolt; 16. Scraper; 17. Slot. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The present invention provides Figure 1-7 The temperature control device of a battery pack group of a battery-swapping vehicle shown in the figure includes a plurality of temperature control plates 3 which are lifted and slidably arranged on a mounting frame 1 at the bottom of the vehicle, and a plurality of guide pillars 6 are relatively vertically slidably installed on the mounting frame 1 at the bottom of the vehicle, and the upper and lower ends of the guide pillars 6 are respectively fixedly connected to the movable frame 5 and the temperature control plate 3; when performing a battery-swapping operation, the battery pack is installed to the position of the mounting frame 1 at the bottom of the vehicle. At this time, the temperature control plate 3 is located above the battery pack, and by driving a plurality of temperature control plates 3 to be pressed down synchronously and fit with the battery pack, heat exchange can be performed with the battery pack to achieve the effect of controlling the temperature of the battery pack. The degree of fit between the surface of the battery pack and the temperature control plate 3 affects the heat exchange efficiency;

[0041] In actual applications, it is necessary to drive several independent small temperature control plates 3 downward at the same time and provide appropriate pressure so that each temperature control plate 3 fits tightly against the surface of the battery pack. This ensures the efficiency of heat conduction. When driving each temperature control plate 3 to fit against the corresponding battery pack, due to the difference in pressure on the temperature control plates 3 at various positions in the battery compartment, the assembly error of the temperature control plates 3, and the possible deviation of the lifting and lowering activities of the temperature control plates 3, it is easy to cause the temperature control plates 3 at some positions to fail to fit tightly against the battery pack. Although by continuously increasing the pressure output by the clamping mechanism, it can be ensured that there is sufficient fitting pressure between all temperature control plates 3 and the battery pack. However, some positions may also cause the problem of excessive pressure on the battery pack, which is easy to cause damage. Therefore, it is necessary to design the movement guide and clamping mechanism of the temperature control plate 3 to ensure that the temperature control plates 3 at various positions in the battery compartment exert moderate pressure on the battery pack and fit tightly.

[0042] like Figure 3-4 As shown, a clamping structure 4 and a beam body 8 driven by the clamping structure 4 to move downward toward the movable frame 5 are provided on the bottom mounting frame 1 of the vehicle. A pressure-relief gasket 9 is provided between the beam body 8 and the movable frame 5. When the beam body 8 and the movable frame 5 are close to each other, the pressure-relief gasket 9 is deformed by pressure. Compared with the structure in which the beam body 8 and the movable frame 5 are relatively fixedly connected in the traditional structure and the movable frame 5 is directly driven to descend by the beam body 8, in the scheme provided in this embodiment, the beam body 8 is separated from the movable frame 5. When the beam body 8 is pressed down to the movable frame 5, the movable frame 5 is pushed down together with the temperature control plate 3 below. The pressure-relief gasket 9 absorbs and supports the downward pressure of the beam body 8 to prevent the movable frame 5 from outputting excessive rigid pressure to the battery pack and causing hard damage. The clamping mechanism can output greater pressure to ensure that the temperature control plate 3 at each position fits the battery pack without causing excessive pressure on the battery pack at some positions.

[0043] like Figure 2 As shown, the guide column 6 is provided with a return spring 7 for pushing the movable frame 5 to drive the temperature control board 3 to rise away from the surface of the battery pack. It is ensured that during the process of disassembling and assembling the battery pack, the pressing mechanism contacts the downward pressure on the movable frame 5 and the temperature control board 3. At this time, the pressure on the return spring 7 disappears, and the movable frame 5 is pushed up by the restoring force to drive the temperature control board 3 to separate from the battery pack, which is convenient for disassembling and assembling the battery pack.

[0044] like Figure 5-7As shown, the clamping structure 4 in this case includes a linear drive unit 410 fixedly mounted on the vehicle bottom mounting frame 1 (a structure such as an electric push rod can be used to provide a linear driving force), the output end of the linear drive unit 410 is fixedly connected to the drive rod 420 through a connecting assembly, and the linear drive unit 410 and the drive rod 420 are horizontally placed above the battery compartment and remain relatively parallel to the vehicle bottom mounting frame 1. A rod 10 is installed on the beam body 8. The side of the drive rod 420 that is in relative sliding contact with the rod 10 is set as an inclined surface 11, and when the rod 10 is translated, the rod 10 always remains in contact with the inclined surface 11. When the linear drive mechanism pushes the driving rod 420 to translate above the battery compartment, the rod 10 slides along the inclined surface 11. Since the driving rod 420 is horizontally placed above the battery compartment, there is a height difference in the longitudinal direction. The rod 10 slides from the high point of the inclined surface 11 to the low point of the inclined surface 11. At this time, the rod 10 is displaced in the longitudinal direction and descends, thereby driving the beam body 8 to synchronously descend to press the movable frame 5 below. The clamping mechanism has a more linear and gentle pressure output, which can avoid the instantaneous driving of the beam body 8 to press down, causing the movable frame 5 to drive the temperature control plate 3 to impact the surface of the battery pack. In addition, compared with directly using a linear mechanism to push the movable frame 5 and the temperature control plate 3 downward, the downward driving force is more stable, and the temperature control plate 3 is relatively gentle during the descent along the guide column 6, which can avoid jamming and tilting. This allows each temperature control plate 3 to accurately descend to a position close to the battery pack and fit tightly with the surface of the battery pack;

[0045] The rod 10 is rotatably mounted on the beam 8 through the connecting seat 12. When the rod 10 translates, the rod 10 rolls along the inclined surface 11. Compared with sliding along the inclined surface 11, the rod 10 rolls along the inclined surface 11, which has smaller friction, thereby ensuring the service life of the rod 10 and reducing the failure rate.

[0046] like Figure 5 As shown, a movable frame 5 is correspondingly arranged at both ends of each beam 8, and the two movable frames 5 are arranged symmetrically with the pressure part of the clamping mechanism on the beam 8. The movable frame 5 is in an I-shape, and the two ends of the longitudinal rod 520 are respectively fixedly connected to the middle of the cross rod 510, and the force application point of the beam 8 on the movable frame 5 is located in the middle of the longitudinal rod 520; the guide column 6 is symmetrically arranged on the temperature control board 3, and the two ends of the cross rod 510 are respectively fixedly connected to the symmetrical guide columns 6. The downward pressure output by the downward pressure mechanism is transmitted to the temperature control board 3 through the beam 8, the longitudinal rod 520 of the movable frame 5, and the cross rod 510 of the movable frame 5 in sequence. Since the pressure part of the downward pressure mechanism on the beam 8 is in the middle of the beam 8, the two movable frames 5 pressed by the beam 8 are symmetrically arranged at both ends, and the force point of the movable frame 5 is in the middle of its longitudinal rod 520. Thereby, the pressure output by the downward pressure mechanism is better balanced, and the downward pressure of each temperature control plate 3 is relatively uniform, further ensuring that the temperature control plate 3 at each position fits tightly to the battery pack and the pressure is moderate.

[0047] like Figure 3-4 As shown, a guide seat 13 with a guide groove 14 in the middle is fixedly installed on the movable frame 5, and the beam body 8 is slidably connected to the guide seat 13 through the guide groove 14. The guide groove 14 is consistent with the width of the beam body 8, and the pressure-reducing gasket 9 is arranged at the bottom of the guide groove 14. A bolt 15 is relatively vertically fixedly installed on the beam body 8, and the other end of the bolt 15 passes through the pressure-reducing gasket 9, the guide seat 13 and the reserved holes on the movable frame 5 in turn. In the process of the beam body 8 being driven down by the downward pressure mechanism, the beam body 8 is always lifted and lowered longitudinally through the guiding and limiting effects of the guide groove 14 and the bolt 15, so as to apply pressure in a direction vertical to the movable frame 5, thereby avoiding the problem of the temperature control plate 3 being stuck or tilted due to the oblique force.

[0048] like Figure 1 As shown, a scraper 16 is provided at the edge of the slot 17 entrance near the temperature control plate 3. When the battery pack is inserted into the slot 17, the scraper 16 scrapes the upper end surface of the battery pack to remove dust or small debris, so that the subsequent temperature control plate 3 and the battery pack surface are more closely attached.

[0049] The temperature control plate 3 in this case is a plate with a flow channel set inside, and the water inlet and outlet of the internal flow channel are connected to the main pipeline on the battery compartment through a hose 2 to form a circulating water circuit. The water pump circulates the hot medium or cold medium through the main pipeline into the water cooling plate to heat or dissipate the heat of the battery pack. It is connected to the main pipeline through a hose 2 to ensure that the water cooling plate will not be restricted by the pipeline during the lifting and lowering activities. The water cooling pipeline, water pump and water cooling plate are all arranged on the chassis mounting frame 1 of the vehicle body. The water-cooled components are completely separated from the battery pack. On the one hand, the water connection step during the battery replacement operation can be omitted, thereby speeding up the battery replacement efficiency; on the other hand, it effectively avoids the problem of reduced service life of the water cooling pipeline caused by water pressure shock every time the water circuit is connected.

[0050] The pressure relief gasket 9 is truncated cone-shaped and has a height of 1-15 mm. When the beam 8 presses the movable frame 5, the pressure relief gasket 9 needs to be deformed under pressure to absorb the pressure. The truncated cone-shaped pressure relief gasket 9 is placed stably, deforms fully and quickly, and can efficiently absorb the pressure applied by the beam 8, preventing the movable frame 5 from outputting excessive rigid pressure to the battery pack and causing hard damage.

[0051] The temperature control device of this case can be applied to not only the bottom warehouse of new energy electric vehicles or charging cabinets of battery swap stations, but also to any equipment used to store battery cells and perform charging and discharging operations on battery cells.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature control device for a battery pack of a battery-swapping vehicle, characterized in that: It comprises a plurality of temperature control plates (3) which are arranged on a vehicle bottom mounting frame (1) in a lifting and sliding manner, a plurality of guide pillars (6) are relatively vertically slidably mounted on the vehicle bottom mounting frame (1), and the upper and lower ends of the guide pillars (6) are respectively fixedly connected to a movable frame (5) and the temperature control plate (3); The vehicle bottom mounting frame (1) is provided with a clamping structure (4) and a beam body (8) driven by the clamping structure (4) to move downward toward the movable frame (5); a pressure-absorbing gasket (9) is provided between the beam body (8) and the movable frame (5); when the beam body (8) and the movable frame (5) are close to each other, the pressure-absorbing gasket (9) is deformed under pressure.

2. A temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: The clamping structure (4) comprises a linear drive unit (410) fixedly mounted on a vehicle bottom mounting frame (1), a drive rod (420) driven to translate by the linear drive unit (410), and a rod member (10) mounted on a beam body (8); The side surface of the driving rod (420) in contact with the rod (10) is arranged as an inclined surface (11); when the rod (10) is in translation, the rod (10) and the inclined surface (11) move relative to each other and always remain in contact with the inclined surface (11).

3. A temperature control device for a battery pack of a battery-swap vehicle according to claim 2, characterized in that: The rod (10) is rotatably mounted on the beam body (8) via a connecting seat (12); when the rod (10) translates, the rod (10) rolls along the inclined surface (11).

4. The temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: The guide column (6) is sleeved with a return spring (7) for pushing the movable frame (5) to drive the temperature control plate (3) to rise away from the surface of the battery pack.

5. The temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: A movable frame (5) is correspondingly arranged at both ends of each beam body (8), and the two movable frames (5) are arranged axially symmetrically with the pressure applying part of the clamping mechanism to the beam body (8).

6. The temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: The movable frame (5) is in an I-shape, and the force application point of the beam body (8) on the movable frame (5) is located in the middle of the longitudinal rod (520) of the movable frame (5); The guide pillars (6) are symmetrically arranged on the temperature control plate (3), and both ends of the crossbar (510) of the movable frame (5) are respectively fixedly connected to the symmetrical guide pillars (6).

7. The temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: A guide seat (13) having a guide groove (14) in the middle is fixedly mounted on the movable frame (5); the beam body (8) is slidably connected to the guide seat (13) via the guide groove (14); the guide groove (14) and the beam body (8) have the same width; and the pressure-reducing gasket (9) is arranged at the bottom of the guide groove (14).

8. The temperature control device for a battery pack of a battery-swap vehicle according to claim 7, characterized in that: A bolt (15) is relatively vertically fixedly installed on the beam body (8), and the other end of the bolt (15) passes through the pressure-reducing gasket (9), the guide seat (13) and the reserved holes on the movable frame (5) in sequence.

9. The temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: A scraper (16) is provided at the edge of the slot (17) entrance close to the temperature control plate (3).

10. The temperature control device for a battery pack of a battery-swap vehicle according to claim 1, characterized in that: The temperature control plate (3) is a plate with a flow channel arranged inside, and the water inlet and outlet of the internal flow channel are respectively connected to the main pipe on the battery compartment (2) through a hose to form a circulating water circuit.

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