Electric motorcycle lithium battery liquid cooling circulation system

Abstract

The utility model discloses a kind of electric motorcycle lithium battery liquid cooling circulation systems including battery pack and the cooling liquid circulation system of battery pack heat dissipation, cooling liquid circulation system includes the cooling layer of high thermal conductivity, air cooling heat sink, radiator pipe, temperature sensor and control system, cooling layer is located between two layers of battery pack, air cooling heat sink is located in the side of battery pack, cooling liquid is circulated in radiator pipe, and the both ends of radiator pipe are equipped with the circulation pump that will radiator pipe form closed loop, circulation pump is used to provide power to the cooling liquid in radiator pipe, radiator pipe has heat collection section in cooling layer and refrigeration section in air cooling heat sink, temperature sensor is located in battery pack, control system is electrically connected with temperature sensor, air cooling heat sink and circulation pump respectively. Compared with prior art, the utility model has the advantages that cooling layer can absorb the heat of adjacent battery pack by "face-face", quickly transfer to cold heat dissipation device through closed loop and concentrate the effect of external discharge, realize that battery still keeps uniform temperature low resistance operation under high rate charge-discharge.

Description

Technical Field

[0001] This utility model relates to the field of battery thermal management technology, and in particular to a liquid cooling circulation system for electric motorcycle lithium batteries. Background Technology

[0002] Currently, lithium batteries are widely used in electric vehicles, energy storage systems, and portable electronic devices. However, during battery charging and discharging, electrochemical reactions inevitably generate a large amount of heat, causing the battery temperature to rise. Excessively high battery temperatures not only significantly reduce the battery's energy density and power performance but also shorten its cycle life and may even trigger safety hazards such as thermal runaway.

[0003] Traditional lithium battery cooling solutions primarily rely on natural convection or forced air cooling. Natural convection has limited cooling capacity and struggles to handle the enormous heat generated by high-power charging and discharging. While forced air cooling provides some cooling, its efficiency is limited by the specific heat capacity and flow rate of the air, making it prone to localized overheating under high heat flux. Furthermore, traditional air cooling solutions typically direct the fan directly at the battery pack, resulting in uneven cooling and potentially causing uneven temperature distribution within the battery pack, affecting battery consistency. Utility Model Content

[0004] This invention addresses the problem that lithium batteries suffer from low heat dissipation efficiency and uneven heat dissipation when cooled by natural convection or forced air cooling, which may increase the size and power consumption of the system. The technical problem this invention aims to solve is to provide a liquid cooling circulation system for electric motorcycle lithium batteries with higher heat dissipation efficiency and more uniform temperature distribution.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a liquid cooling circulation system for electric motorcycle lithium batteries, including a battery pack and a coolant circulation system for dissipating heat from the battery pack, characterized in that the coolant circulation system includes a highly thermally conductive cooling layer, a wind-cooled heat dissipation device, a heat dissipation pipe, a temperature sensor, and a control system; the cooling layer is attached to at least one main thermal contact surface of the battery pack (when there are two or more battery packs, the cooling layer preferably contacts the spacer surface between two adjacent battery packs); the wind-cooled heat dissipation device is located on one side of the battery pack; coolant flows inside the heat dissipation pipe, and both ends of the heat dissipation pipe are provided with a shape that allows the heat dissipation pipe to be shaped. A closed-loop circulation pump is provided to power the coolant in the heat dissipation pipe, enabling the coolant to circulate within the pipe. The heat dissipation pipe has a heat collection section located within the cooling layer and a cooling section located within the air-cooled heat dissipation device. A temperature sensor is located inside the battery pack. The control system is electrically connected to the temperature sensor, the air-cooled heat dissipation device, and the circulation pump. When the temperature sensor detects that the battery pack temperature is higher than a preset value, the control system starts the circulation pump and the air-cooled heat dissipation device. At this time, the coolant in the heat collection section carries heat and is transported to the cooling section for heat dissipation under the action of the circulation pump. Simultaneously, the coolant in the cooling section flows into the cooling layer to cool the battery pack.

[0006] A further preferred embodiment of this utility model is: the cooling layer includes a box with a high thermal conductivity, the box has a built-in cooling channel, the cooling channel meanders multiple times within the box and covers the entire plane of the box, and the outer contour shape of the heat collection section matches the shape of the cooling channel.

[0007] A further preferred embodiment of this utility model is: the cooling layer further includes a high thermal conductivity composite material layer, the high thermal conductivity composite material layer covers the side or both sides of the housing near the battery pack, and the high thermal conductivity composite material layer is closely attached to the battery pack.

[0008] A further preferred embodiment of this utility model is: the air-cooled heat dissipation device includes a heat dissipation plate assembly that encloses the cooling section and a heat dissipation fan that blows air onto the heat dissipation plate assembly.

[0009] A further preferred embodiment of this utility model is as follows: the heat sink assembly includes an upper heat sink and a lower heat sink, and the upper heat sink and the lower heat sink are provided with multiple meandering mounting grooves on their opposite surfaces. When the upper heat sink covers the lower heat sink, the openings of the two mounting grooves are opposite to each other to form a closed heat dissipation channel. The cooling section is embedded in the heat dissipation channel, and the outer contour of the cooling section matches the shape of the heat dissipation channel.

[0010] A further preferred embodiment of this utility model is that the heat sink assembly has multiple heat dissipation fins distributed on it.

[0011] A further preferred embodiment of this utility model is that the coolant has high thermal conductivity, insulation and corrosion resistance.

[0012] A further preferred embodiment of this utility model is that the heat dissipation pipe is a metal pipe with high thermal conductivity, or a plastic pipe with good chemical corrosion resistance and high temperature resistance.

[0013] A further preferred embodiment of this utility model is: the heat dissipation pipe has two exposed sections outside the cooling layer and the air-cooled heat dissipation device, and the two exposed sections are bent to the same side and have a gap.

[0014] A further preferred embodiment of this utility model is as follows: the battery pack is fixedly installed inside the battery box, the air-cooled heat dissipation device is installed outside the battery box, the side wall of the battery box corresponding to the air-cooled heat dissipation device is provided with through holes for heat dissipation pipes to pass through, and the battery box is a metal box with high thermal conductivity or a high-strength composite material box.

[0015] Compared with the prior art, the present invention has the following advantages: 1. By attaching the cooling layer to at least one of the main thermal contact surfaces of the battery pack, and in conjunction with the closed-loop heat dissipation pipe and external air-cooling device, the cooling layer can absorb a large amount of heat from the battery pack as a whole from the surface to the surface, quickly transfer it to the air-cooling device through a closed loop, and dissipate it externally. This achieves the effect of maintaining uniform temperature and low resistance operation of the battery even under high-rate charging and discharging, and solves the problems of local overheating, large temperature gradient and low heat dissipation efficiency of traditional air-cooling solutions.

[0016] 2. By integrating circulation pumps at both ends of the heat pipe and connecting them in a closed loop with temperature sensors and control systems, it achieves the effect of "on-demand start and stop" active liquid cooling. This allows the fan to operate at low speed or even stop when the vehicle is stationary or at low speed, avoiding the problems of high noise and high power consumption caused by continuous high-speed air cooling. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a three-dimensional structural diagram of the coolant circulation system and battery box after installation according to a preferred embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the preferred embodiment of the present invention after disassembling the battery box; Figure 3 This is a three-dimensional structural diagram of the coolant circulation system according to a preferred embodiment of the present invention; Figure 4 This is a preferred embodiment of the present utility model. Figure 3 Rear view; Figure 5 This is a preferred embodiment of the present utility model. Figure 4 Sectional view at point AA.

[0019] In the diagram: 1. Battery pack; 2. Coolant circulation system; 21. Cooling layer; 211. High thermal conductivity composite material layer; 212. Box body; 2121. Shell; 2122. Cover plate; 213. Cooling channel; 22. Air-cooled heat dissipation device; 221. Upper heat sink; 222. Lower heat sink; 223. Cooling fan; 224. Mounting slot; 225. Heat dissipation fins; 23. Heat dissipation pipe; 231. Heat collection section; 232. Cooling section; 233. Exposed section; 24. Temperature sensor; 25. Control system; 26. Circulation pump; 6. Battery box; 7. Through hole. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0021] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0022] This embodiment mainly describes a liquid cooling cycle system for electric motorcycle lithium batteries, as detailed below: like Figures 1 to 5 As shown, a liquid cooling circulation system for an electric motorcycle lithium battery includes a battery pack 1 and a coolant circulation system 2 for dissipating heat from the battery pack 1. The coolant circulation system 2 includes a high thermal conductivity cooling layer 21, an air-cooled heat dissipation device 22, a heat dissipation pipe 23, a temperature sensor 24, and a control system 25. The cooling layer 21 is attached to at least one major thermal contact surface of the battery pack 1. For example, the cooling layer 21 can be located on the end surface or side surface of the battery stack. When there are two or more battery packs 1, the cooling layer 21 preferably contacts the spacer surface between two adjacent battery packs 1. This design achieves high thermal conductivity contact between the surface of the upper and lower battery packs 1 through a single cooling layer 21, thereby rapidly absorbing and conducting away the accumulated heat generated during the charging and discharging of the cells, achieving the effect of equal-intensity cooling for the upper and lower battery packs 1, and avoiding the defects of bulky structure, high energy consumption, and poor space adaptability caused by setting up multiple independent air ducts.

[0023] The air-cooled heat dissipation device 22 is placed on one side of the battery pack 1, dissipating the heat absorbed by the cooling layer 21 to the outside air. Coolant flows through the heat dissipation pipe 23, and circulation pumps 26 are provided at both ends to form a closed loop within the heat dissipation pipe 23. The circulation pumps 26 provide power to the coolant within the heat dissipation pipe 23, enabling the coolant to circulate within the heat dissipation pipe 23. The heat dissipation pipe 23 has a heat collection section 231 located within the cooling layer 21 and a cooling section 232 located within the air-cooled heat dissipation device 22. A temperature sensor 24 is embedded inside the battery pack 1 to detect the temperature of the battery pack 1 in real time. The control system 25 is electrically connected to the temperature sensor 24, the air-cooled heat dissipation device 22, and the circulation pumps 26. When the temperature sensor 24 detects that the temperature is higher than a preset threshold, the control system 25 immediately starts the circulation pump 26 and the air-cooled heat dissipation device 22. Driven by the circulation pump 26, the coolant in the heat collection section 231 of the heat pipe 23 located in the cooling layer 21 flows rapidly, transferring heat to the cooling section 232 located in the air-cooled heat dissipation device 22 for release. The cooled liquid then flows back to the cooling layer 21, thus forming a continuous cycle of "heat absorption-heat transfer-heat release," keeping the battery pack 1 in the optimal temperature range at all times. This avoids the risk of thermal runaway caused by local overheating of the battery pack 1, improves the overall safety of the battery system, and extends the life of the battery pack 1. At the same time, the heat pipe 23 is made of a metal material with high thermal conductivity. During the process of the coolant carrying heat from the cooling layer 21 to the air-cooled heat dissipation device 22, the heat pipe 23 can dissipate some of the heat into the air, thereby reducing the heat dissipation pressure on the air-cooled heat dissipation device 22 and further improving the heat dissipation effect.

[0024] like Figure 2 and Figure 3 As shown, the cooling layer 21 includes a box 212 with high thermal conductivity. The box 212 has a built-in cooling channel 213. The cooling channel 213 meanders multiple times within the box 212 and covers the entire plane of the box 212. The outer contour of the heat collection section 231 is completely matched with the cooling channel 213. In this utility model, the cooling channel 213 is set in a meandering shape, which greatly increases the heat exchange area between the heat dissipation pipe 23 and the box 212. This allows the coolant to continuously "skim" away heat along the flow path, achieving efficient surface-to-surface temperature uniformity. This eliminates the phenomenon of local overheating or uneven temperature that is common in traditional air cooling, ensuring high temperature consistency between the two battery packs 1, improving capacity retention and safety, and extending the service life of the battery pack 1.

[0025] To facilitate the installation of the cooling channel 213, the housing 212 includes a shell 2121 with an opening and a cover plate 2122 that closes the opening. When the cover plate 2122 is closed on the shell 2121, it forms a cavity with the shell 2121. The cooling channel 213 is disposed within the cavity. A slot for installing the heat collector section 231 is provided on one side wall of the shell 2121. When installing the heat collector section 231, the cover plate 2122 is opened, and the heat collector section 231 is placed into the cooling channel 213 and the slot. The cooling channel 213 can be integrally formed with the shell 2121, or it can be fixed by screws or other means. The shell 2121 and the cover plate 2122 can also be a single unit, with the heat collector section 231 embedded between the shell 2121 and the cover plate 2122.

[0026] Specifically, the cooling layer 21 also includes a high thermal conductivity composite material layer 211, which covers the cover plate 2122 on one or both sides near the battery pack 1. The high thermal conductivity composite material layer 211 is in close contact with the battery pack 1. This high thermal conductivity composite material layer 211 not only has a high thermal conductivity but also has a certain compressive elasticity. After installation, it is in close contact with the battery surface and can fill the air gaps caused by microscopic unevenness, so that heat can be transferred to the cooling channel 213 with "zero waiting time". The cooling channel 213 immediately and quickly and evenly introduces the heat of the cell into the housing 212 along the thickness direction. The housing 212 evenly diffuses the heat laterally to the heat collection section 231 of the heat sink 23, avoiding excessive local temperature rise caused by poor adhesion of traditional rigid heat sinks and improving the temperature uniformity of the entire battery pack. The high thermal conductivity composite material layer 211 includes, but is not limited to, thermally conductive silicone sheets, thermally conductive graphite sheets, thermally conductive graphene sheets, thermally conductive aluminum sheets, etc.

[0027] Specifically, the housing 212 and the cooling channel 213 are both made of metal materials with high thermal conductivity, such as copper, aluminum, iron, etc., preferably aluminum. Aluminum is lightweight, corrosion-resistant and has high thermal conductivity, which reduces the weight of the whole vehicle and ensures that the thermal resistance of the path of heat from the high thermal conductivity composite material layer 211 to the heat pipe 23 is extremely low.

[0028] Specifically, the air-cooled heat dissipation device 22 consists of a heat sink assembly and a cooling fan 223. The heat sink assembly encloses the cooling section 232, and the cooling fan 223 is used to continuously blow air onto the heat sink assembly. The heat of the coolant in the cooling section 232 is rapidly diffused into the outside air through the wall of the heat sink assembly, and the cooling fan 223 forces convection to remove the heat, causing the coolant temperature to drop rapidly, thereby ensuring that the coolant flowing back to the cooling layer 21 always has sufficient heat absorption capacity.

[0029] The heat sink assembly includes an upper heat sink 221 and a lower heat sink 222. Both the upper and lower heat sinks 221 and 222 have multiple meandering mounting grooves 224 on their opposite surfaces. When the upper heat sink 221 covers the lower heat sink 222, the openings of the two mounting grooves 224 form a closed heat dissipation channel. A cooling section 232 is embedded within the heat dissipation channel, and the outer contour of the cooling section 232 matches the shape of the heat dissipation channel. The upper and lower heat sinks 221 and 222 are made of metals with high thermal conductivity, such as copper, aluminum, or iron, preferably aluminum. The meandering heat dissipation channel significantly prolongs the residence time of the coolant within the heat sink, increases the contact area between the cooling section 232 and the upper and lower heat sinks 221 and 222, improves the efficiency of the cooling section 232 in releasing heat to the heat sink, and avoids the problem of excessively high coolant return temperature caused by insufficient heat dissipation at the liquid cooling rear end.

[0030] like Figure 2 and Figure 3 As shown, in order to further improve the heat exchange capacity of the heat sink assembly, multiple heat dissipation ribs 225 are distributed on the outer surface of the upper heat sink 221 and the lower heat sink 222. The heat dissipation ribs 225 are integrally extruded with the heat sink assembly, serving as structural reinforcing ribs to improve the strength of the plate and also rapidly dissipating the heat from the heat dissipation pipe 23 along the height direction of the heat dissipation ribs 225, significantly increasing the turbulent contact area with the flowing air, improving the convective heat transfer coefficient, and further reducing the outlet coolant temperature of the cooling section 232.

[0031] Specifically, the coolant is a special fluid with high thermal conductivity, insulation, and corrosion resistance; it has a high thermal conductivity and can absorb a large amount of heat in a short time; it has extremely low electrical conductivity, so even if the heat sink 23 leaks slightly due to vibration or extreme working conditions, it will not form a conductive path in the battery box 6, completely eliminating the risk of short circuits that may be caused by traditional water cooling solutions; its corrosion resistance ensures that the coolant will not corrode the circulating pump 26, heat sink 23, and cooling channel 213 during circulation, improving the system life and reliability.

[0032] Specifically, the heat dissipation pipe 23 is a metal pipe with high thermal conductivity or a plastic pipe with good chemical corrosion resistance and high temperature resistance. The metal pipe material can be copper, iron, aluminum, or other metals, with copper being preferred. Copper has excellent thermal conductivity and excellent bending workability, which can easily form a complex three-dimensional shape that completely fits the cooling channel 213 of the cooling layer 21 and the heat dissipation channel of the air-cooled heat dissipation device 22, reducing contact thermal resistance. After the copper surface is treated with an anti-oxidation coating, it is not easy to accumulate scale for a long time, maintaining a long-lasting high heat exchange efficiency. At the same time, copper has good toughness and can withstand the continuous vibration and thermal expansion and contraction fatigue during vehicle operation, ensuring that the liquid cooling cycle does not leak or crack throughout its entire life cycle, providing a reliable circulation path for stable system operation. The plastic pipe with good chemical corrosion resistance and high temperature resistance can be an engineering plastic pipe such as nylon PA12, PPS, PEEK, or PTFE.

[0033] Specifically, in this utility model, taking a two-layer battery pack 1 as an example, the battery liquid cooling circulation system is not limited to use on a two-layer battery pack 1. Each layer of battery pack 1 consists of multiple lithium battery cells arranged in parallel. The cooling layer 21 is sandwiched between the two layers of battery pack 1, which can dissipate heat from both the upper and lower layers of battery pack 1 at the same time. There is no need to arrange each layer separately, which simplifies the pipeline and reduces the energy consumption of the circulation pump 26. A small gap is left between the parallel cells. With the surface-to-surface temperature uniformity of the cooling layer 21, the problem of excessive temperature gradient caused by dead zone between cells in the traditional air cooling solution is completely eliminated, and the cycle life of the entire pack is extended.

[0034] Specifically, the heat dissipation pipe 23 has two exposed sections 233 exposed outside the cooling layer 21 and the air-cooled heat dissipation device 22. The two exposed sections 233 are bent to the same side and have a gap. The two exposed sections 233 are bent to the same side to save installation space. The exposed sections 233 maintain a certain gap to prevent adjacent heat dissipation pipes 23 from generating noise and wear due to vibration contact. At the same time, it avoids heat exchange between the two exposed sections 233, thereby reducing the heat dissipation effect.

[0035] Specifically, the battery pack 1 is fixedly installed inside the battery box 6, and the air-cooled heat dissipation device 22 is installed outside the battery box 6. The side wall of the battery box 6 corresponding to the air-cooled heat dissipation device 22 is provided with through holes 7 for the heat dissipation pipe 23 to pass through. The battery box 6 is a metal box with high thermal conductivity or a high-strength composite material box. The metal box can be made of metals such as aluminum, copper, and iron, preferably aluminum, as aluminum battery box 6 is lightweight and has good electromagnetic shielding and temperature uniformity. The composite material box can be made of high-strength glass fiber composite material, SMC (sheet molding compound), carbon fiber reinforced composite material, etc.

[0036] In this scheme, the heat pipe 23 and the coolant form a liquid cooling system. This system has a high degree of integration and controllable volume, and can better adapt to battery packs 1 of different shapes and sizes. Compared with the complex air duct design, the pipe layout of the liquid cooling system is more flexible. At the same time, the liquid cooling system is usually quieter than the air cooling system in high-temperature environments. Especially when high-power heat dissipation is required, the fan speed is reduced and the noise is also reduced.

[0037] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] The above provides a detailed description of the liquid cooling circulation system for electric motorcycle lithium batteries provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A liquid cooling circulation system for an electric motorcycle lithium battery, comprising a battery pack and a coolant circulation system for dissipating heat from the battery pack, characterized in that, The coolant circulation system includes a highly thermally conductive cooling layer, an air-cooled heat dissipation device, heat pipes, a temperature sensor, and a control system. The cooling layer is attached to at least one major thermal contact surface of the battery pack. The air-cooled heat dissipation device is located on one side of the battery pack. Coolant flows through the heat pipes, and circulation pumps are provided at both ends of the heat pipes to form a closed loop. The circulation pumps provide power to the coolant in the heat pipes. The heat pipes have a heat-collecting section located in the cooling layer and a cooling section located in the air-cooled heat dissipation device. The temperature sensor is located inside the battery pack. The control system is electrically connected to the temperature sensor, the air-cooled heat dissipation device, and the circulation pumps. When the temperature sensor detects that the battery pack temperature is higher than a preset value, the control system starts the circulation pumps and the air-cooled heat dissipation device. At this time, the coolant in the heat-collecting section carries heat and is transported to the cooling section for heat dissipation under the action of the circulation pump. At the same time, the coolant in the cooling section flows into the cooling layer to cool the battery pack.

2. The liquid cooling circulation system for an electric motorcycle lithium battery according to claim 1, characterized in that: The cooling layer includes a box with high thermal conductivity, and the box has a built-in cooling channel. The cooling channel meanders multiple times within the box and covers the entire plane of the box. The outer contour shape of the heat collection section matches the shape of the cooling channel.

3. The liquid cooling circulation system for an electric motorcycle lithium battery according to claim 2, characterized in that: The cooling layer also includes a high thermal conductivity composite material layer, which covers one or both sides of the housing near the battery pack and is in close contact with the battery pack.

4. A liquid cooling cycle system for an electric motorcycle lithium battery according to claim 1 or 2, characterized in that: The air-cooled heat dissipation device includes a heat dissipation plate assembly that encloses the cooling section and a heat dissipation fan that blows air onto the heat dissipation plate assembly.

5. The liquid cooling circulation system for an electric motorcycle lithium battery according to claim 4, characterized in that: The heat sink assembly includes an upper heat sink and a lower heat sink. The upper and lower heat sinks have multiple meandering mounting grooves on their opposite surfaces. When the upper heat sink covers the lower heat sink, the openings of the two mounting grooves face each other to form a closed heat dissipation channel. The cooling section is embedded in the heat dissipation channel, and the outer contour of the cooling section matches the shape of the heat dissipation channel.

6. The liquid cooling circulation system for an electric motorcycle lithium battery according to claim 4, characterized in that: The heat sink assembly has multiple heat dissipation fins distributed on it.

7. The liquid cooling cycle system for an electric motorcycle lithium battery according to claim 1, characterized in that: The coolant has high thermal conductivity, insulation and corrosion resistance.

8. The liquid cooling cycle system for an electric motorcycle lithium battery according to claim 1, characterized in that: The heat dissipation pipe is a metal pipe with high thermal conductivity or a plastic pipe with good chemical corrosion resistance and high temperature resistance.

9. The liquid cooling cycle system for an electric motorcycle lithium battery according to claim 1, characterized in that: The heat dissipation pipe has two exposed sections that are exposed outside the cooling layer and the air-cooled heat dissipation device. The two exposed sections are bent to the same side and have a gap.

10. The liquid cooling cycle system for an electric motorcycle lithium battery according to claim 1, characterized in that: The battery pack is fixed inside the battery box, and the air-cooled heat dissipation device is located outside the battery box. The side wall of the battery box corresponding to the air-cooled heat dissipation device is provided with through holes for heat dissipation pipes to pass through. The battery box is a metal box with high thermal conductivity or a high-strength composite material box.

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