Liquid-cooled battery pack

Abstract

The present invention discloses a liquid-cooled battery pack, comprising an upper cover, a lower cover and a battery assembly, wherein the upper cover and the lower cover are mutually enclosed to form a sealed cavity, wherein the battery assembly is accommodated in the cavity, and further comprising: a transmission belt assembly arranged around the gap of the battery assembly in the cavity, two movable reels respectively connected by two free ends of the transmission belt assembly, and a transmission assembly driving the two movable reels to simultaneously perform reverse reciprocating motions. In the present invention, a heat-conducting belt structure crossing between multi-layer battery racks is adopted, so that the transmission belt is fully in contact with the battery rack during the reciprocating expansion and contraction process, thereby facilitating the transmission belt assembly to absorb heat from the battery assembly, while providing a short heat exchange time, thereby increasing the heat exchange efficiency of the transmission belt assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery boxes, and in particular relates to a liquid-cooled battery pack. Background Art

[0002] Liquid-cooled battery boxes achieve cooling through the phase change of liquid coolant. They have the characteristics of large heat carrying capacity, low flow resistance, and high heat exchange efficiency. They can quickly and effectively remove the heat generated inside the battery pack and keep the battery working within a suitable temperature range, thereby improving the performance and life of the battery. They can better adapt to application scenarios with high energy density of battery packs, fast charging and discharging speeds, and large changes in ambient temperature.

[0003] In the application of new energy passenger vehicles, liquid cooling has gradually become popular. The liquid cooling system is used to exchange heat inside and outside the battery module to achieve the purpose of heat dissipation, instead of relying on the battery box for heat dissipation. This design keeps the power battery module warm in cold winter weather, reduces the temperature difference inside the battery module, and improves the stability of the entire battery module. In addition, the liquid-cooled battery box can be highly integrated with the battery pack, is easy to install on site, and occupies a small area. If used in vehicles, it will not only help improve the space utilization of the vehicle, but also help reduce the weight of the vehicle.

[0004] The existing liquid cooling boxes mainly adopt two configurations: single-cut structure and composite structure. The battery pack liquid cooling plate with single-cut structure is cut into multiple pieces from a whole piece of aluminum plate, and liquid flow channels are cut on the surface. This structure is simple to manufacture and low in cost, but when the area is large, it is also prone to problems such as poor liquid flow and poor cooling effect. The battery pack liquid cooling plate with composite structure is composed of a liquid cooling plate and a copper core plate, which are tightly combined to form an integrated liquid cooling plate structure. This structure is difficult to manufacture, but has good thermal conductivity and stable cooling effect, and is widely used in high-end electric vehicles and new energy vehicles.

[0005] In the latest research, a belt-type structure configuration has been designed. The battery pack with the belt-type structure is composed of a closed cooling belt between multiple layers of battery panels and a cooling liquid channel filled in the cooling belt. However, this structure will cause the cooling belt to be fixedly buried in the liquid cooling box. In the absence of external pump pressure, the liquid flow channel in the cooling belt will not actively generate flow, and the thermal conductivity is weak. In addition, compared with metal cavities such as aluminum plates, the cooling belt can withstand a smaller range of liquid flow pressures and cannot be directly connected to an external liquid cooling pipe system. Summary of the invention

[0006] The purpose of the present invention is to provide a liquid-cooled battery pack in order to address the problem that in the configuration of the internal belt structure of the liquid cooling box, the flexible cooling belt cannot actively generate a liquid flow circuit, resulting in the cooling belt being unable to quickly transfer heat to an external liquid cooling system, and the thin tubes of the flexible material cannot be directly connected to the external liquid cooling system.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A liquid-cooled battery pack comprises an upper cover, a lower cover and a battery assembly, wherein the upper cover and the lower cover are mutually surrounded to form a sealed cavity, and the battery assembly is accommodated in the cavity, and further comprises:

[0009] A transmission belt assembly arranged around the gap of the battery assembly in the cavity, two movable reels respectively connected to the two free ends of the transmission belt assembly, and a transmission assembly driving the two movable reels to simultaneously perform reverse reciprocating motion;

[0010] The battery assembly includes a battery rack with multiple layers of equal spacing, a battery component fixedly installed in the battery rack, and fixing buckles for installation on both sides of the battery rack;

[0011] The upper cover body includes an upper cover assembly and two fixed side plates that are fixedly installed in cooperation with the fixing buckles on the multi-layer battery rack;

[0012] The lower cover body comprises a lower cover assembly which cooperates with the bottom opening of the upper cover assembly to form a sealed cavity;

[0013] The transmission belt assembly includes an inner belt and an outer belt arranged around the gap between the multi-layer battery racks, an inner roller and an outer roller that have a transmission rotation function for the inner belt and the outer belt respectively, and a plurality of springs connecting the inner rollers and the outer rollers adjacent to each other, so that the distances between the adjacent inner rollers and the outer rollers are equal during the spring balance time, the end faces of the inner belt and the outer belt are integrally connected to each other, and the side faces do not fit each other, and the two free ends of the plurality of inner belts and the outer belts after being integrally formed are both outer belts.

[0014] The movable reel comprises a reel frame respectively arranged with the outer belts at the two free end positions, the two reel frames are rotatably connected with a winding roller and a transmission roller which are mutually driven and wound with the outer belts, the end surfaces of the two winding rollers away from the reel frame are fixed with inner shafts, the annular outer edges of the two inner shafts are rotatably connected with outer wheels, and the sides of the two outer wheels are fixed with limit shafts;

[0015] A protruding connecting plate is fixed on one of the two fixed side plates that is arranged close to the outer wheel. A single-groove plate is slidably connected in the vertical sliding groove formed in the gap between the protruding connecting plate and the fixed side plate. A horizontal single groove is provided on the single-groove plate to cooperate with the sliding of the limit shaft. The protruding connecting plate is also provided with a rack that meshes with the outer annular teeth of the outer wheel.

[0016] Wherein, a unidirectionally rotating ratchet mechanism is arranged between the two outer wheels and the inner shaft, and the ratchet directions of the ratchet mechanisms on the two outer wheels are the same.

[0017] Wherein, the ratchet mechanism includes an inner pawl installed at the outer edge of the inner shaft and an outer ratchet installed at the inner edge of the outer wheel, the inner pawl and the outer ratchet are both elastic, and the inner pawl and the outer ratchet are clamped in the counterclockwise direction.

[0018] Among them, a double-groove plate is fixed on one of the two fixed side plates that is close to the reel frame, and the two reel frames are respectively fixed with extension rods. The double-groove plate has two horizontal double grooves that are arranged parallel to each other, and the two connection points between the extension rod and the reel frame are respectively slidably connected to the two horizontal double grooves.

[0019] Wherein, the edges of the inner belt and the outer belt of the multi-layer battery rack are rotatably connected with transmission rollers.

[0020] Among them, the transmission assembly includes two mutually meshing transmission gears, a protruding shaft fixed above the two transmission gears, two sliding plates respectively fixed to the two extension rods, semi-arc grooves on the two sliding plates for cooperating with the protruding shafts to slide, and a motor fixedly installed inside the upper cover assembly, and a driving gear is installed at the output end of the motor, and the driving gear is meshed and connected with one of the two transmission gears.

[0021] Among them, the semi-arc groove is set as a groove structure in which the middle arc segment is connected to two straight line segments, the arc radius of the arc segment is equal to the distance from the protruding shaft to the center of the transmission gear, and the distance between the farthest points of the two straight line segments is greater than twice the distance between the centers of the transmission gears.

[0022] Among them, a vertical groove plate is also fixedly arranged on the inner side of the upper cover body, and a vertical groove is opened on the vertical groove plate for cooperating with the outer roller and the inner roller to penetrate and slide vertically. Fixed rods are also fixed at both ends of the vertical groove, and pull rings are opened at the extended ends of the outer roller and the inner roller passing through the vertical groove, and the gaps between the multiple pull rings and the fixed rods are connected to each other by springs.

[0023] Wherein, the upper cover body also includes bolts for fixing the connection between the fixing buckle and the fixed side plate.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. In the present invention, a heat-conducting belt structure crossing between multiple layers of battery racks is adopted. The transmission belt assembly is cyclically pulled, tightened and released by the transmission assembly, so that the transmission belt assembly can fully contact with the battery rack when loosened, and is displaced relative to the initial state after tightening, thereby achieving full contact between the transmission belt and the battery rack during the reciprocating expansion and contraction process, which is beneficial for the transmission belt to remove heat from the battery rack.

[0026] 2. In the present invention, a movable reel-type winding structure is adopted, and the transmission belt assembly is wound and stored by a winding roller and a transmission roller, and the movable reel can be interconnected with an external liquid cooling pipe through a hose, so that the transmission belt structure wound on the movable reel can be fully cooled, which is beneficial to the transmission belt assembly to absorb heat from the battery assembly.

[0027] 3. In the present invention, an intermittent reciprocating transmission structure is adopted. Through a smoothly rotating motor, the winding, releasing and intermittent cycle of the transmission belt assembly is realized in sequence. During the winding and releasing process, the contact area between the transmission belt assembly and the battery assembly is replaced, which is conducive to fully utilizing the overall length of the transmission belt assembly; during the intermittent process, the transmission belt assembly and the battery assembly are fully contacted, providing a short heat exchange time, thereby increasing the heat exchange efficiency of the transmission belt assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the main structure of the present invention after decomposition (without the lower cover);

[0030] Figure 3 It is a transverse vertical cross-sectional schematic diagram of the transmission assembly in the present invention;

[0031] Figure 4 It is a schematic diagram of a longitudinal vertical section of a transmission assembly in the present invention;

[0032] Figure 5 It is a schematic diagram of a horizontal vertical section of the movable scroll in the present invention;

[0033] Figure 6 This is an exploded view of the front main body of the present invention;

[0034] Figure 7 This is an exploded view of the rear main body of the present invention;

[0035] Figure 8 It is a schematic diagram of a horizontal vertical section of a non-central axis of the motor in the present invention;

[0036] Fig. 9 For the present invention Figure 8 Enlarged view of point A in the middle;

[0037] Fig.10 It is a schematic diagram of a transverse vertical section of a vertical slot plate in the present invention;

[0038] Fig.11 For the present invention Fig.10 Enlarged view of point B in the middle;

[0039] Fig.12 It is a schematic diagram of a longitudinal vertical section at the roller winding position in the present invention;

[0040] Fig.13 It is a horizontal vertical cross-sectional exploded view of the winding roller in the present invention (without the lower cover);

[0041] Fig.14 For the present invention Fig.13 Enlarged view of point C in the middle;

[0042] Fig.15 It is a schematic diagram of a transverse vertical section of a single slot plate in the present invention;

[0043] Fig.16 For the present invention Fig.15 Enlarged view of point D in the middle.

[0044] Markings in the figure:

[0045] 1. Upper cover body; 11. Upper cover assembly; 12. Fixed side plate; 121. Bolt; 13. Protruding connecting plate; 131. Rack; 14. Vertical slot plate; 141. Vertical slot; 142. Fixed rod;

[0046] 2. lower cover body; 21. lower cover assembly;

[0047] 3. Transmission belt assembly; 31. Outer belt; 32. Inner belt; 33. Outer roller; 34. Inner roller; 35. Spring; 36. Pull ring;

[0048] 4. Transmission assembly; 41. Transmission gear; 42. Protruding shaft; 43. Sliding plate; 44. Semi-arc groove; 45. Single groove plate; 451. Horizontal single groove; 46. Double groove plate; 461. Horizontal double groove; 47. Motor; 48. Driving gear;

[0049] 5. movable reel; 51. winding roller; 52. transmission roller; 53. reel frame; 54. inner shaft; 541. inner ratchet; 55. outer wheel; 551. outer ratchet; 56. limit shaft; 57. extension rod;

[0050] 6. Battery assembly; 61. Battery component; 62. Battery rack; 63. Fixing buckle; 64. Transmission roller. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] Embodiment 1, refer to Figure 1-16 A liquid-cooled battery pack includes an upper cover 1, a lower cover 2 and a battery assembly 6, wherein the upper cover 1 and the lower cover 2 are mutually surrounded to form a sealed cavity, and the battery assembly 6 is accommodated in the cavity, and further includes:

[0053] A transmission belt assembly 3 is arranged in the cavity around the gap of the battery assembly 6, two free ends of the transmission belt assembly 3 are respectively connected to two movable reels 5, and a transmission assembly 4 drives the two movable reels 5 to simultaneously perform reverse reciprocating motions;

[0054] The upper cover 1 and the lower cover 2 are closed together at the interface to form a closed cavity structure, and the transmission belt assembly 3, the transmission assembly 4, the movable reel 5 and the battery assembly 6 are accommodated in the cavity of the cavity structure;

[0055] The battery assembly 6 is a multi-layer plate structure with gaps, and the transmission belt assembly 3 is wound around the multi-layer gaps in the battery assembly 6, and the transmission belt assembly 3 is arranged as an inner and outer layer. The inner layer transmission belt assembly 3 has a tendency to contract with each other, and the outer layer transmission belt assembly 3 has a tendency to expand with each other. When the two ends of the transmission belt assembly 3 are not limited by external forces, the inner and outer layers of the transmission belt assemblies 3 contract and expand with each other, so that the transmission belt assembly 3 and the multi-layer plate structure of the battery assembly 6 are fully in contact and friction, which is conducive to taking away the heat accumulated in the battery assembly 6 through the transmission belt assembly 3 during the contact process;

[0056] Specifically, the transmission assembly 4 is configured to drive the movable reel 5 to reciprocate on a horizontal plane, thereby driving the two free ends of the transmission belt assembly 3 to be pulled, tightened, loosened, and unfolded to produce a reciprocating traction effect; this enables the transmission belt assembly 3 to fully fit the battery assembly 6.

[0057] The battery assembly 6 includes a battery rack 62 with multiple layers and equal spacing, a battery component 61 fixedly installed in the battery rack 62, and fixing buckles 63 for installation on both sides of the battery rack 62;

[0058] Specifically, the battery rack 62 is provided to install multiple battery components 61 on the same flat plate, so that both sides of the multiple battery racks 61 are cooled through the gaps between the multiple battery racks 62, and the fixing buckles 63 are provided to fix the multiple battery racks 62 at equal intervals in the inner cavity of the upper cover assembly 11;

[0059] The upper cover body 1 includes an upper cover assembly 11 and two fixed side plates 12 fixedly mounted with the fixing buckles 63 on the multi-layer battery rack 62; the lower cover body 2 includes a lower cover assembly 21 that cooperates with the bottom opening of the upper cover assembly 11 to form a sealed cavity;

[0060] Among them, the upper cover body 1 is used to form an inwardly concave upper cover assembly 11, and then the remaining structures are fixed and installed by fixing the side panels 12; the lower cover assembly 21 in the lower cover body 2 is a hollow plate-like structure, which is used to directly connect with the external liquid cooling pipeline to enhance the thermal conductivity of the overall structure.

[0061] The transmission belt assembly 3 includes an inner belt 32 and an outer belt 31 arranged at the gap between the multi-layer battery rack 62, an inner roller 34 and an outer roller 33 respectively having a transmission function on the inner belt 32 and the outer belt 31, and a spring 35 connected between the adjacent inner rollers 34 and the outer rollers 33, so that the adjacent inner rollers 34 and the outer rollers 33 are at equal distances during the spring balance time, the end faces of the inner belt 32 and the outer belt 31 are integrally connected to each other, and the side faces do not fit each other, and the two free ends of the multiple inner belts 32 and the outer belts 31 after being integrally formed are both the outer belts 31; and the inner rollers 34 and the outer rollers 33 respectively have rotatable rotating sleeves at the interlayer between the inner belt 32 and the outer belt 31;

[0062] Specifically, when the belt structure in the transmission belt assembly 3 is wound around the inner roller 34, the overall belt structure is set to a soft heat-conductive material, and the belt structure at this location is set to the inner belt 32. When the belt structure is wound around the outer roller 33, the belt structure at this location is set to the outer belt 31. Therefore, the inner belt 32 and the outer belt 31 are an integrally formed belt structure; at the same time, the multiple outer rollers 33 and the inner roller 34 on the same side are respectively located on two vertical planes, and the vertical plane of the inner roller 34 is closer to the vertical plane of the outer roller 33. When close to the battery rack 62 and in a balanced state, any inner roller 34 is located on the middle plane of the two adjacent outer rollers 33, and the number of outer rollers 33 is always one more than the number of inner rollers 34. Therefore, the inner belt 32 and the outer belt 31 are always out of contact with each other at this time. On the one hand, it avoids the wear caused by the contact between the inner belt 32 and the outer belt 31, and on the other hand, it is beneficial for the inner belt 32 and the outer belt 31 to have full contact with the battery rack 62, that is, it is beneficial to the heat conduction of the battery component 61.

[0063] The movable reel 5 comprises a reel frame 53 respectively arranged with the outer belts 31 at the two free end positions, and the two reel frames 53 are rotatably connected with a winding roller 51 and a transmission roller 52 which are mutually driven and wound with the outer belts 31, and the end surfaces of the two winding rollers 51 away from the reel frame 53 are fixed with inner shafts 54, and the annular outer edges of the two inner shafts 54 are rotatably connected with outer wheels 55, and the sides of the two outer wheels 55 are fixed with limit shafts 56;

[0064] Specifically, the two reel frames 53 are used to support the winding roller 51 and the driving roller 52 in the same vertical plane, and the centers of the winding roller 51 and the driving roller 52 are rotatably connected to the hollow shaft of the reel frame 53, and the hollow shaft can be connected to the external liquid cooling system through a hose to cool the winding roller 51 and the driving roller 52;

[0065] A protruding connecting plate 13 is fixed on one of the two fixed side plates 12 that is arranged close to the outer wheel 55. A single-groove plate 45 is slidably connected in the vertical slide groove formed at the gap between the protruding connecting plate 13 and the fixed side plate 12. The single-groove plate 45 is provided with a horizontal single groove 451 that cooperates with the sliding of the limit shaft 56. The protruding connecting plate 13 is also provided with a rack 131 that meshes with the outer annular teeth of the outer wheel 55; a unidirectional rotating ratchet mechanism is provided between the two outer wheels 55 and the inner shaft 54, and the ratchet directions of the ratchet mechanisms on the two outer wheels 55 are the same; the ratchet mechanism includes an inner pawl 541 installed at the outer edge of the inner shaft 54 ​​and an outer ratchet 551 installed at the inner edge of the outer wheel 55, and the inner pawl 541 and the outer ratchet 551 are both elastic, and the inner pawl 541 and the outer ratchet 551 are clamped in the counterclockwise direction;

[0066] Specifically, when the two reel racks 53 are close to each other, the outer wheels 55 in the two reel racks 53 are meshed with each other and connected with the rack 131, so that the outer wheels 55 in the two reel racks 53 rotate in opposite directions, and the ratchets in the two reel racks 53 have the same direction, that is, at this time, the first ratchet mechanism in the two reel racks 53 is locked, and the inner shaft 54 ​​is driven to rotate by the outer wheel 55, thereby driving the roller 51 to reel the outer belt 31, and the second ratchet mechanism is not locked, so when the outer wheel 55 rotates, the inner shaft 54 ​​is not driven to rotate, that is, the inner shaft 54 ​​only moves in translation;

[0067] When the two reel racks 53 move away from each other, the outer wheels 55 in the two reel racks 53 rotate in opposite directions through the meshing connection between the outer wheels 55 and the rack 131, and the rotation direction is opposite to that before. However, contrary to the above, the second ratchet mechanism in the two reel racks 53 is locked at this time, and the outer wheels 55 in the second ratchet mechanism drive the inner shaft 54 ​​to rotate, and drive the winding roller 51 to release the outer belt 31;

[0068] To sum up, in the reciprocating motion of the two reel racks 53 moving away from and approaching each other, the outer belt 31 at the second ratchet mechanism is released between the battery racks 62, and then the outer belt 31 is wound up by the winding roller 51 at the first ratchet mechanism. In the process of releasing and winding up, there is a gap period after the release, which is conducive to the full fit between the transmission belt assembly 3 and the battery rack 62.

[0069] The arrangement of the inner pawl 541 and the outer ratchet tooth 551 is only one implementation of the existing ratchet mechanism, and other ratchet mechanisms can also achieve the same effect.

[0070] Among them, a double-grooved plate 46 is fixed on one of the two fixed side plates 12 that is arranged close to the reel frame 53, and an extension rod 57 is fixed to each of the two reel frames 53. The double-grooved plate 46 is provided with two horizontal double grooves 461 that are arranged parallel to each other, and two connecting points between the extension rod 57 and the reel frame 53 are respectively slidably connected to the two horizontal double grooves 461; the edges of the multi-layer battery frame 62 that are attached to the inner belt 32 and the outer belt 31 are rotatably connected to the transmission roller 64;

[0071] Among them, the extension rod 57 is set to a hollow pipe structure, which can be connected to an external liquid hose for rapid heat exchange. The double groove plate 46 and the horizontal double groove 461 are set to support the extension rod 57 to ensure that the extension rod 57 and the structure fixed to it slide in the horizontal direction. The transmission roller 64 is set to reduce the friction generated when the transmission belt assembly 3 contacts the corner of the battery rack 62, thereby reducing the wear of the transmission belt assembly 3.

[0072] The transmission assembly 4 includes two mutually meshing transmission gears 41, a protruding shaft 42 fixed above the two transmission gears 41, two sliding plates 43 respectively fixed to two extension rods 57, a semi-arc groove 44 on the two sliding plates 43 cooperating with the protruding shaft 42 to slide, and a motor 47 fixedly installed inside the upper cover assembly 11, a driving gear 48 is installed at the output end of the motor 47, and the driving gear 48 is meshed and connected with one of the two transmission gears 41; the semi-arc groove 44 is set as a groove structure in which the middle arc segment is connected with two straight line segments, the arc radius of the arc segment is equal to the distance from the protruding shaft 42 to the center of the transmission gear 41, and the distance between the farthest points of the two straight line segments is greater than twice the distance between the centers of the transmission gears 41; the central axes of the two transmission gears 41 are both rotatably connected to the lower cover assembly 21;

[0073] Specifically, when the motor 47 is powered on and rotated, the two transmission gears 41 can be driven to rotate in opposite directions through the driving gear 48, and the protruding shaft 42 on the transmission gear 41 slides in the semi-arc groove 44; when the semi-arc groove 44 coincides with the central axis of the transmission gear 41, the rotation of the protruding shaft 42 in the semi-arc groove 44 does not affect the sliding plate 43, forming an idle period for the reel frame 53; when the semi-arc groove 44 does not coincide with the central axis of the transmission gear 41, the rotation of the protruding shaft 42 in the semi-arc groove 44 drives the sliding plate 43 to slide horizontally back and forth, thereby realizing the cycle of the reel frame 53 approaching and moving away from each other.

[0074] A vertical slot plate 14 is fixedly arranged on the inner side of the upper cover 1, and a vertical slot 141 is provided on the vertical slot plate 14 for the outer roller 33 and the inner roller 34 to penetrate and slide vertically. Fixed rods 142 are fixed to both ends of the vertical slot 141, and pull rings 36 are provided at the extended ends of the outer roller 33 and the inner roller 34 penetrating the vertical slot 141. The gaps between the plurality of pull rings 36 and the fixed rod 142 are connected to each other through springs 35. The upper cover 1 also includes a bolt 121 fixed at the connection between the fixed buckle 63 and the fixed side plate 12.

[0075] Specifically, when the two reel racks 53 move away from each other, the winding roller 51 on one reel rack 53 is locked by the ratchet mechanism, driving the winding roller 51 to release the outer belt 31, and the ratchet mechanism on the other reel rack 53 fails, driving the winding roller 51 not to rotate, so that the total length of the belt structure in the transmission belt assembly 3 increases. At this time, the springs 35 connected between the multiple pull rings 36 change the spacing between the multiple outer rollers 33 and the inner rollers 34, and are no longer in the equal spacing arrangement in the initial state, thereby affecting the inner belt 32 and the outer belt 31 transmitted between the outer roller 33 and the inner roller 34. In addition, the loose belt structure is conducive to the contact between the belt structure and the battery rack 62.

[0076] When the two reel racks 53 approach each other, one winding roller 51 retracts the outer belt 31, and the ratchet mechanism on the other winding roller rack 53 fails, causing the winding roller 51 to stop rotating, thereby shortening the total length of the belt structure in the transmission belt assembly 3. At this time, the spring 35 connected between the multiple pull rings 36 restores the distance between the multiple outer rollers 33 and the inner rollers 34 to the initial state, so that the inner belt 32 and the outer belt 31 are tightened, and the overall belt structure is displaced a certain distance relative to the initial state, which is beneficial for the belt structure to conduct heat to the battery rack 62.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled battery pack, comprising an upper cover (1), a lower cover (2) and a battery assembly (6), wherein the upper cover (1) and the lower cover (2) are mutually enclosed to form a sealed cavity, and the battery assembly (6) is accommodated in the cavity. It is characterized in that Also includes: A transmission belt assembly (3) arranged in the cavity around the gap of the battery assembly (6), two movable reels (5) respectively connected to the two free ends of the transmission belt assembly (3), and a transmission assembly (4) driving the two movable reels (5) to simultaneously perform reverse reciprocating motion; The battery assembly (6) comprises a battery rack (62) with multiple layers of equally spaced distribution, a battery component (61) fixedly installed in the battery rack (62), and fixing buckles (63) on both sides of the battery rack (62) for installation; The upper cover body (1) comprises an upper cover assembly (11) and two fixed side panels (12) fixedly mounted in cooperation with fixed buckles (63) on the multi-layer battery rack (62); The lower cover body (2) comprises a lower cover assembly (21) which cooperates with the bottom opening of the upper cover assembly (11) to form a sealed cavity; The transmission belt assembly (3) comprises an inner belt (32) and an outer belt (31) arranged at the gap between the multi-layer battery rack (62), an inner roller (34) and an outer roller (33) respectively having a transmission rotation function for the inner belt (32) and the outer belt (31), and a plurality of springs (35) connected between adjacent inner rollers (34) and outer rollers (33), so that the distances between adjacent inner rollers (34) and outer rollers (33) are equal during the spring balance time, the end faces of the inner belt (32) and the outer belt (31) are integrally connected to each other, and the side faces do not fit each other, and the plurality of inner belts (32) and the outer belts (31) are integrally formed to form an integral belt structure, and the two free ends of the belt structure are both outer belts (31); the integral belt structure is configured as a soft heat conductive material; The movable reel (5) comprises a reel frame (53) respectively arranged in cooperation with the outer belts (31) at the two free end positions, the two reel frames (53) are rotatably connected with a winding roller (51) and a driving roller (52) which are mutually transmitted and wound in cooperation with the outer belts (31), the end surfaces of the two winding rollers (51) away from the reel frame (53) are fixed with inner shafts (54), the annular outer edges of the two inner shafts (54) are rotatably connected with outer wheels (55), and the sides of the two outer wheels (55) are fixed with limiting shafts (56); the centers of the winding rollers (51) and the driving rollers (52) are rotatably connected with the hollow rotating shaft of the reel frame (53), and the hollow rotating shaft is connected to the external liquid cooling system through a hose.

2. A liquid-cooled battery pack as claimed in claim 1, Features: A protruding connecting plate (13) is fixed on one of the two fixed side plates (12) disposed close to the outer wheel (55); a single groove plate (45) is slidably connected in a vertical sliding groove formed at a gap between the protruding connecting plate (13) and the fixed side plate (12); a horizontal single groove (451) cooperating with the sliding of the limit shaft (56) is provided on the single groove plate (45); and a rack (131) meshing with an outer ring tooth of the outer wheel (55) is also provided on the protruding connecting plate (13).

3. A liquid-cooled battery pack as claimed in claim 2, Features: A unidirectionally rotating ratchet mechanism is provided between the two outer wheels (55) and the inner shaft (54), and the ratchet directions of the ratchet mechanisms on the two outer wheels (55) are the same.

4. A liquid-cooled battery pack as claimed in claim 3, Features: The ratchet mechanism comprises an inner pawl (541) installed at the outer edge of the inner shaft (54) and an outer ratchet (551) installed at the inner edge of the outer wheel (55); the inner pawl (541) and the outer ratchet (551) are both elastic, and the inner pawl (541) and the outer ratchet (551) are arranged to be engaged in a counterclockwise direction.

5. A liquid-cooled battery pack as claimed in claim 2, Features: A double-grooved plate (46) is fixed on one of the two fixed side plates (12) that is arranged close to the reel frame (53). An extension rod (57) is fixed on each of the two reel frames (53). The double-grooved plate (46) is provided with two horizontal double grooves (461) arranged parallel to each other. Two connection points between the extension rod (57) and the reel frame (53) are respectively slidably connected to the two horizontal double grooves (461). The extension rod (57) is arranged as a hollow pipe structure and can be connected to an external liquid hose for rapid heat exchange.

6. A liquid-cooled battery pack as claimed in claim 5, Features: The edges of the multi-layer battery rack (62) that are in contact with the inner belt (32) and the outer belt (31) are rotatably connected to transmission rollers (64).

7. A liquid-cooled battery pack as claimed in claim 5, Features: The transmission assembly (4) comprises two mutually meshing transmission gears (41), a protruding shaft (42) fixed above the two transmission gears (41), two sliding plates (43) respectively fixed to the two extension rods (57), semi-arc grooves (44) on the two sliding plates (43) for sliding with the protruding shafts (42), and a motor (47) fixedly mounted inside the upper cover assembly (11), wherein a driving gear (48) is mounted on the output end of the motor (47), and the driving gear (48) is meshedly connected with one of the two transmission gears (41).

8. A liquid-cooled battery pack as claimed in claim 7, Features: The semi-arc groove (44) is configured as a groove structure in which a middle arc segment is connected to two straight segments, the arc radius of the arc segment is equal to the distance from the protruding shaft (42) to the center of the transmission gear (41), and the distance between the farthest points of the two straight segments is greater than twice the distance from the center of the transmission gear (41).

9. A liquid-cooled battery pack as claimed in claim 1, Features: A vertical groove plate (14) is also fixedly provided on the inner side of the upper cover body (1), and a vertical groove (141) is provided on the vertical groove plate (14) for the outer roller (33) and the inner roller (34) to penetrate and slide vertically. Fixed rods (142) are also fixed at both ends of the vertical groove (141), and pull rings (36) are provided at the extended ends of the outer roller (33) and the inner roller (34) penetrating the vertical groove (141), and the gaps between the plurality of pull rings (36) and the fixed rods (142) are connected to each other via springs (35).

10. A liquid-cooled battery pack as claimed in claim 9, Features: The upper cover body (1) also includes bolts (121) for fixing the connection between the fixing buckle (63) and the fixing side plate (12).

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