Battery pack of electric motorcycle

Abstract

The utility model relates to a battery pack of an electric motorcycle, which comprises a battery pack shell of the electric motorcycle, a battery cell positioned in the battery pack shell of the electric motorcycle, a semiconductor chilling plate connected with the battery cell and used for cooling the battery cell, and radiating fins arranged on the outer side of the battery pack shell of the electric motorcycle, compared with the prior art, the battery pack of the electric motorcycle disclosed by the utility model has the advantage that the heat dissipation of the battery core can be accelerated by utilizing the air flow outside the shell of the battery pack of the electric motorcycle.

Description

Technical Field

[0001] The utility model relates to the field of power battery thermal management, in particular to a battery pack for an electric motorcycle. Background Art

[0002] As energy technologies mature, new energy electric vehicles are becoming increasingly commonplace. Electric motorcycles are a type of electric vehicle, powered by the energy from their battery packs. Therefore, the performance of these batteries significantly impacts the performance of electric vehicles. However, electric vehicles often experience insufficient power, a sharp drop in range, or even power failure during operation, severely impacting their operation. Utility Model Content

[0003] Based on this, the purpose of this utility model is to overcome the defects or shortcomings of the existing technology and provide an electric motorcycle battery pack, the technical solution of which is as follows:

[0004] An electric motorcycle battery pack comprises: an electric motorcycle battery pack shell, a battery cell located in the electric motorcycle battery pack shell, a semiconductor cooling plate located in the electric motorcycle battery pack shell and connected to the battery cell to cool the battery cell, and a heat dissipation fin, wherein the heat dissipation fin is arranged on the outside of the electric motorcycle battery pack shell to dissipate heat from the semiconductor cooling plate.

[0005] The electric motorcycle battery pack of the utility model can cool the battery cells through the semiconductor refrigeration plate and fully utilize the airflow outside the electric motorcycle battery pack shell to accelerate the heat dissipation of the battery cells without the need for additional air cooling or water cooling devices. It can reduce the lack of power and the sharp decline in cruising ability caused by insufficient heat dissipation of the electric motorcycle battery pack during driving.

[0006] Furthermore, the heat dissipation fins include a heat conducting plate and a plurality of fins; the heat conducting plate is fixed to the electric motorcycle battery pack shell and one side surface is connected to the semiconductor refrigeration fin, the fins are protruded from the other side surface of the heat conducting plate and at least a portion is exposed outside the electric motorcycle battery pack shell, and the plurality of fins are arranged at intervals to form air channels between the fins, so that the external airflow can pass through the fins quickly, thereby improving the heat dissipation speed.

[0007] Furthermore, the electric motorcycle battery pack housing and the heat dissipation fins are an integrated structure to improve strength.

[0008] Furthermore, the battery pack housing of the electric motorcycle is an aluminum alloy housing to facilitate heat dissipation and reduce weight.

[0009] Furthermore, thermally conductive silica gel is provided between the battery core and the semiconductor refrigeration plate to improve the heat conduction capability.

[0010] Furthermore, it also includes a BMS substrate, which is far away from the semiconductor refrigeration chip and is electrically connected to the semiconductor refrigeration chip and the battery cell respectively. The BMS substrate can control the current on the semiconductor refrigeration chip according to the temperature of the battery cell, thereby accurately and effectively controlling the battery cell temperature.

[0011] Furthermore, the BMS substrate includes an NTC probe for measuring the temperature of the battery cell, and the NTC probe can accurately measure the temperature of the battery cell.

[0012] Furthermore, there are two semiconductor refrigeration fins and two heat dissipation fins, and a conductor refrigeration fin and a heat dissipation fin are respectively provided on the opposite sides of the battery core. The double semiconductor refrigeration fins and double heat dissipation fins can improve the cooling and heat dissipation speed.

[0013] Furthermore, it also includes a BMS substrate located on one side of the battery cell, and the BMS substrate is located between two conductive cooling plates. The BMS substrate can control the current on the semiconductor cooling plate according to the temperature of the battery cell, thereby accurately and effectively controlling the battery cell temperature.

[0014] Furthermore, the semiconductor refrigeration plate is provided with a cold end and a hot end, the cold end is connected to the battery core, and the hot end is connected to the heat dissipation fins, so as to achieve cooling of the battery core and heat dissipation of the hot end of the semiconductor refrigeration plate.

[0015] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the electric motorcycle battery pack in Example 1 of the present utility model;

[0017] Figure 2 For the Figure 1 Cross-sectional view of the electric motorcycle battery pack when projected in direction A;

[0018] Figure 3 This is a cross-sectional view of the electric motorcycle battery pack in Example 2 of the present utility model. DETAILED DESCRIPTION

[0019] The inventors analyzed existing electric motorcycles, which suffer from insufficient power and a sharp drop in range, and found that these problems often occur during high-speed driving. This is because high-speed driving often requires the battery pack to output high power, which causes the battery pack to heat up immediately. This heat accumulates in the battery pack over a short period of time, further accelerating the battery pack's discharge and causing a sharp drop in range. Therefore, improving the heat dissipation capacity of the battery pack is crucial.

[0020] To this end, the inventors further studied the existing electric motorcycle battery pack cooling structure and found that the existing electric motorcycle battery pack generally uses semiconductor refrigeration sheets to cool the battery cells. However, the semiconductor refrigeration sheets are affected by power and have limited cooling capacity. If high-power semiconductor refrigeration sheets are used for cooling, it will not only accelerate the loss of original electrical energy, but the semiconductor refrigeration sheets will also generate heat while cooling, which will delay the cooling of the electric motorcycle battery pack and further reduce the cooling capacity of the electric motorcycle battery pack.

[0021] Therefore, the inventors further searched for other factors besides semiconductor cooling sheets that can cool down the battery pack of electric motorcycles. In fact, the time when the battery pack of an electric motorcycle heats up seriously is during high-speed driving, and high-speed driving is also when the gas flow rate on the electric motorcycle is relatively high. If the high-speed airflow generated when the electric motorcycle is running at high speed can be used to quickly take away the heat from the battery pack of the electric motorcycle, the heat accumulation during this period can be reduced, thereby reducing the problems such as insufficient power and a sharp drop in endurance caused by heat dissipation problems. Based on the analysis of this problem, the present invention further provides heat dissipation fins to assist the semiconductor cooling sheet in dissipating heat on the basis of the original electric motorcycle battery pack, and the heat dissipation fins are arranged on the outside of the battery pack shell of the electric motorcycle, and the high-speed airflow generated when the electric motorcycle is running at high speed is used to quickly take away the heat from the heat dissipation fins, thereby improving the heat dissipation efficiency of the semiconductor cooling sheet.

[0022] The electric motorcycle battery pack of the present invention is described in detail below based on two embodiments.

[0023] Example 1

[0024] Please refer to Figure 1 and Figure 2 The electric motorcycle battery pack of the present invention is installed on the body of the electric motorcycle, and includes an electric motorcycle battery pack shell 1, a BMS (battery management system) substrate 2, a battery cell 3, a cooling circuit wire 4, a semiconductor cooling sheet 6 and a heat dissipation fin 7.

[0025] Specifically, the electric motorcycle battery pack housing 1 is a shell used to wrap the electric motorcycle battery pack in the prior art, and can be an aluminum alloy shell, etc.

[0026] The BMS substrate 2 includes an NTC probe (not shown) for measuring the temperature of the battery cell 3. In this embodiment, the BMS substrate 2 detects the temperature of the battery cell 3 and controls the on / off power supply to the semiconductor refrigeration chip 6 and adjusts the current provided by the battery cell 3 to the semiconductor refrigeration chip 6, thereby adjusting the operating state of the semiconductor refrigeration chip 6.

[0027] The battery core 3 and the semiconductor refrigeration plate 6 are stacked in sequence from top to bottom on the inner bottom surface of the battery pack shell 1 of the electric motorcycle, and the BMS substrate 2 and the semiconductor refrigeration plate 6 are electrically connected via the refrigeration circuit wire 4. The heat dissipation fins 7 are connected to the semiconductor refrigeration plate 6, and at least a portion of them are exposed outside the battery pack shell 1 of the electric motorcycle. In order to better dissipate heat, one side of the semiconductor refrigeration plate 6 is in contact with the plane on the battery core 3, and the other side is fixed to the inner bottom surface of the battery pack shell 1 of the electric motorcycle and is connected to the heat dissipation fins 7. The battery core 3 can supply power to the electric motorcycle, the BMS substrate 2 and the semiconductor refrigeration plate 6. The battery core 3 generates heat during operation, and the semiconductor refrigeration plate 6 cools the battery core 3. At the same time, the heat generated by the battery core 3 and the semiconductor refrigeration plate 6 is transferred to the heat dissipation fins 7, and the heat dissipation fins 7 conduct the heat to the external environment.

[0028] The battery core 3 may include, but is not limited to, a square or a cylinder. The upper surface of the battery core 3 of different shapes fits in with the semiconductor cooling plate 6 to achieve better cooling.

[0029] The semiconductor refrigeration chip 6 is a solid-state device that uses the Peltier effect to achieve cooling in the prior art. It includes a cold end and a hot end. The cold end is located below the battery cell 3, and the hot end is located above the heat sink 7. When the semiconductor refrigeration chip 6 is in operation, the cold end cools the battery cell 3, while the hot end generates heat, which is then transferred to the heat sink 7 at the bottom of the electric motorcycle battery pack housing 1. In addition, because the semiconductor refrigeration chip 6 is a device that can achieve a cooling effect solely by passing an electric current, compared to other cooling devices, it does not require additional air cooling or water cooling.

[0030] The heat dissipation fins 7 include a heat conducting plate 71 and a plurality of fins 72. The heat conducting plate 71 is fixed to the bottom surface of the electric motorcycle battery pack housing 1, and one side of the plate surface is in contact with the semiconductor refrigeration plate 6. The fins 72 are protruding from the plate surface of the heat conducting plate 71 facing away from the semiconductor refrigeration plate 6 and at least a portion is exposed outside the electric motorcycle battery pack housing 1, extending along the direction of vehicle travel. Projected along the extension direction of the fins 72, a plurality of fins 72 are arranged at intervals, and air channels 73 are formed between each fin 72. When the vehicle moves forward, air flows in the air channel 73, and the air flow is used to dissipate heat from the heat dissipation fins 7. When the vehicle is running at high speed, the battery cell 3 usually has a large output power and a high temperature. The heat dissipation fins 7 can just make full use of the oncoming convection wind for cooling without the need for additional water cooling or air cooling devices.

[0031] Preferably, the heat dissipation fins 7 and the electric motorcycle battery pack housing 1 are an integrated structure, and the heat dissipation fins 7 are protrudingly provided on the bottom surface of the electric motorcycle battery pack housing 1 .

[0032] Preferably, a thermally conductive silica gel 5 is further provided between the battery core 3 and the semiconductor refrigeration plate 6 , and the thermally conductive silica gel 5 quickly transfers the heat of the battery core 3 to the semiconductor refrigeration plate 6 .

[0033] During operation, as the vehicle moves forward, the temperature of the battery cell 3 gradually rises, and the BMS substrate 2 detects the temperature of the battery cell 3. When the temperature of the battery cell 3 rises to a set threshold, the semiconductor refrigeration chip 6 is connected to begin cooling and dissipating heat. The cold end of the semiconductor refrigeration chip 6 absorbs the heat generated by the battery cell 3, and the heat dissipation fins 7 use the oncoming wind during vehicle driving to dissipate heat from the hot end of the semiconductor refrigeration chip 6. If the temperature of the battery cell 3 continues to rise after exceeding the set threshold, the current passing through the semiconductor refrigeration chip 6 is linearly increased, thereby increasing the cooling capacity. When the maximum allowable temperature of the battery cell 3 is reached, the battery cell 3 outputs the maximum current to the semiconductor refrigeration chip 6, and the semiconductor refrigeration chip 6 reaches its maximum output power. When the temperature of the battery cell 3 is suppressed and begins to drop, the current passing through the semiconductor refrigeration chip 6 is linearly reduced, reducing the cooling capacity. When the temperature of the battery cell 3 drops below the set threshold, the semiconductor refrigeration chip 6 circuit is disconnected, rendering it inactive. At this time, the heat dissipation fins 7 can still maintain a certain heat dissipation capacity. In addition, since the semiconductor refrigeration sheet 6 can still work with extremely low power, under certain extreme working conditions, even if the temperature of the battery core 3 continues to rise and is about to stop working, as long as some of the battery cores 3 can still supply power, the semiconductor refrigeration sheet 6 can still output cooling capacity for cooling. After the battery core 3 stops supplying power, the cold air generated by the semiconductor refrigeration sheet 6 can still be used for cooling for a period of time.

[0034] Example 2

[0035] See also Figure 3 The electric motorcycle battery pack structure of this embodiment is substantially identical to that disclosed in Example 1, differing only in that: the electric motorcycle battery pack includes two semiconductor cooling fins 6 and two heat sink fins 7. The two semiconductor cooling fins 6 are respectively affixed to the opposing upper and lower sides of the battery cell 3, with the battery cell 3 positioned between the cold ends of the two semiconductor cooling fins 6. At least a portion of the heat sink fins 7 is exposed outside the bottom and top surfaces of the electric motorcycle battery pack housing 1. The BMS substrate 2 is disposed on one side of the battery cell 3 and positioned between the two semiconductor cooling fins 6. The BMS substrate 2 is electrically connected to the two semiconductor cooling fins 6 via the cooling circuit conductors 4. The two semiconductor cooling fins 6 and two heat sink fins 7 increase heat dissipation power and improve cooling capacity.

[0036] Compared to the prior art, the electric motorcycle battery pack of the present invention uses the BMS substrate 2 to monitor the temperature of the battery cells 3 and control the operation of the semiconductor cooling fins 6 to cool the battery cells 3. The semiconductor cooling fins 6 are refrigeration devices that achieve both cooling and heating effects solely by supplying current. They feature a simple, lightweight structure and high cooling capacity, eliminating the need for additional air or water cooling devices. By directly adjusting the current, cooling capacity is adjusted, enabling more precise and effective control of the battery cell 3 temperature. This improves the refrigeration system's response speed and reduces energy waste caused by excess cooling capacity. Furthermore, the electric motorcycle battery pack is primarily used in electric motorcycles. As vehicle speed increases and vehicle output power increases, the temperature of the battery cells 3 rises. The exposed heat sink fins 7 on the outer shell 1 of the electric motorcycle battery pack can fully utilize the incoming convection to cool the battery cells, eliminating the need for additional water or air cooling devices. Furthermore, because the semiconductor cooling fins 6 require very low current, they can continue to cool and dissipate heat as long as some of the battery cells 3 are still receiving power. Even after power is removed from the battery cells 3, the semiconductor cooling fins 6 can continue to provide cooling for a period of time, significantly reducing the risk of overheating.

[0037] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the concept of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. An electric motorcycle battery pack, characterized in that: include: Electric motorcycle battery pack housing; A battery cell, which is located in the battery pack housing of the electric motorcycle; a semiconductor cooling sheet located in the battery pack housing of the electric motorcycle and connected to the battery cell to cool the battery cell; The heat dissipation fins are arranged on the outside of the electric motorcycle battery pack shell to dissipate heat for the semiconductor refrigeration fins; the heat dissipation fins include a heat conducting plate and a plurality of fins; the heat conducting plate is fixed to the electric motorcycle battery pack shell and one side of the plate is connected to the semiconductor refrigeration fins, the fins are protruded on the other side of the heat conducting plate and exposed outside the electric motorcycle battery pack shell, and the plurality of fins are arranged at intervals to form air channels between the fins; the number of the semiconductor refrigeration fins and the heat dissipation fins is two, and a conductor refrigeration fin and a heat dissipation fin are respectively provided on the opposite sides of the battery core.

2. The electric motorcycle battery pack according to claim 1, characterized in that: The electric motorcycle battery pack housing and the heat dissipation fins are an integrated structure.

3. The electric motorcycle battery pack according to claim 1, characterized in that: The electric motorcycle battery pack shell is an aluminum alloy shell.

4. The electric motorcycle battery pack according to claim 1, characterized in that: Thermally conductive silica gel is also provided between the battery core and the semiconductor refrigeration plate.

5. The electric motorcycle battery pack according to claim 1, characterized in that: It also includes a BMS substrate, which is far away from the semiconductor refrigeration plate and is electrically connected to the semiconductor refrigeration plate and the battery core respectively.

6. The electric motorcycle battery pack according to claim 5, characterized in that: The BMS substrate includes an NTC probe for measuring the temperature of the battery cell.

7. The electric motorcycle battery pack according to claim 1, characterized in that: It also includes a BMS substrate located on one side of the battery core, and the BMS substrate is located between two conductive cooling plates.

8. The electric motorcycle battery pack according to any one of claims 1 to 7, characterized in that: The semiconductor refrigeration plate is provided with a cold end and a hot end, the cold end is connected to the battery core, and the hot end is connected to the heat dissipation fin.

Images