A power battery cooling device

Abstract

The present invention discloses a power battery heat dissipation device, comprising a box body and a ventilation device. The box body comprises a placement box with an open upper end surface and a cover. The cover is detachably installed on the upper end surface of the placement box. An air inlet end connected to an external cold air source is arranged at the center position of the cover. An air outlet end is also arranged on the cover. The ventilation device comprises an air inlet component, a ventilation component and a stepper fan. The air inlet component is located at the bottom of the placement box, and the ventilation component is located on both sides of the placement box. The air inlet components are connected to both ends of the ventilation component. The ventilation component is connected to the air inlet component to form a channel for gas circulation. The other end of the ventilation component is installed with a stepper fan. The present invention has a simple structure and can well cool the power battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries, and in particular relates to a power battery heat dissipation device. Background Art

[0002] As electric vehicles are gradually introduced to the market, the thermal safety issues of power batteries in electric vehicles are gradually exposed. In electric vehicles, power batteries often need to be charged and discharged with large currents, which will generate a lot of heat including Joule heat, reaction heat and polarization heat in the process. The space in the car is small, and usually a large number of single cells in the battery pack are closely arranged together, and the accumulated heat is difficult to discharge. The temperature of the battery may exceed the normal range when working for a long time. At the same time, due to the different spatial positions, the temperature of each single cell will also be different. The excessively high temperature of the battery pack will reduce the efficiency of battery charging and discharging, affect the safety and reliability of the battery pack, and cause thermal failure in severe cases. Therefore, it is necessary to perform thermal management on the power battery of electric vehicles. The air-cooled heat dissipation system is widely used in the battery heat dissipation system due to its simple structure, light weight, low cost, and ability to meet the heat dissipation requirements of the battery pack. The existing air-cooled heat dissipation device is generally a one-way serial or parallel ventilation method, which is easy to cause the local temperature of the battery pack to be too high or the temperature distribution to be uneven, and the heat dissipation effect of the battery pack cannot be guaranteed. Therefore, it is necessary to develop a new type of air-cooled heat dissipation device with a simple structure, convenient operation, and good heat dissipation effect of the battery pack.

[0003] Chinese patent CN201610089162.6 discloses a circulating air-cooling heat dissipation device for power batteries, including a battery box with a support plate, a stepping fan, a temperature sensor, and a control device. One side of the battery box is provided with a top air outlet, an air inlet for inputting air to the battery box through a stepping fan, and a bottom air outlet in sequence from top to bottom. The top air outlet, the bottom air outlet, and the air inlet channel in the battery box are all provided with an electric control valve. The control device is connected to the temperature sensor and each valve circuit, and is used to control the opening and closing of each valve according to the temperature difference of each part of the power battery collected by the temperature sensor, so as to switch the flow path of the air in the battery box. The present invention uses the battery pack temperature information obtained by the temperature sensor to control the opening and closing of each valve, realize the cyclic switching of the cooling air direction of the battery pack, ensure that the maximum temperature and temperature difference of the battery pack are within the normal range, and realize the good temperature consistency of the battery pack. However, when the temperature sensor is used to detect the temperature of the battery pack, there is a hysteresis of the data. When it is detected that the temperature of the battery pack is too high, it is obvious that the battery pack has reduced the efficiency of the battery pack due to the high temperature. Using a temperature sensor to detect the temperature of the battery pack and then using a stepping fan to cool it down is a cumbersome process, prone to errors, and has a complex structure.

[0004] In order to cool the battery pack more effectively, refrigeration equipment is sometimes installed. The refrigeration equipment box injects cold air into the battery pack to cool it down. However, excessive cooling will affect the life and usage of the battery pack. It is very important to ensure the temperature balance of the entire battery pack while cooling it down. Summary of the invention

[0005] The purpose of the present invention is to provide a power battery heat dissipation device, which forms an airflow circulation heat exchange process in a box where the power battery is assembled, so as to avoid the situation where the temperature of the part of the power battery directly in contact with the cold air is too low due to direct blowing of cold air, while other parts cannot be fully cooled down. The circulating airflow makes the temperature in the box more uniform, and the specially designed sealing device not only discharges the gas in the box, but also plays a good sealing role.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A power battery heat dissipation device comprises a box body and a ventilation device. The box body comprises a placement box with an open upper end surface and a cover. The cover is detachably mounted on the upper end surface of the placement box. An air inlet end connected to an external cold air source is arranged at the center of the cover. An air outlet end is also arranged on the cover. The ventilation device comprises an air inlet component, a ventilation component and a stepper fan. The air inlet component is located at the bottom of the placement box, the ventilation component is located on both sides of the placement box, both ends of the ventilation component are connected to the air inlet component, the ventilation component is connected to the air inlet component to form a channel for gas circulation, and the other end of the ventilation component is mounted with a stepper fan.

[0008] Preferably, the air inlet component is specifically a through groove located in the bottom of the placement box, the through groove is connected to the placement box, and the ventilation component is specifically a channel located in the two sides of the placement box.

[0009] Preferably, a control unit is also provided, and the control unit is electrically connected to the stepping fan to control the forward and reverse rotation of the stepping fan.

[0010] Furthermore, a protrusion is arranged on the top edge of the placement box, and a groove is arranged on the bottom of the cover, and the groove cooperates with the protrusion.

[0011] Furthermore, the air outlet end includes an air outlet hole and a sealing device. The air outlet hole runs through both sides of the groove, and the height of the outer air outlet hole is higher than that of the inner air outlet hole. An installation cavity is arranged on the protrusion, and the installation cavity is connected with the air outlet holes on both sides. A slider is slidably installed in the installation cavity, and the slider seals the installation cavity. A through hole is also arranged on the top of the slider for gas discharge. A cylinder with the same diameter as the through hole is arranged in the installation cavity. A spring is also arranged near the outer air outlet hole. The spring is located in the installation cavity, pushes the slider toward the inner air outlet hole, and inserts the cylinder into the through hole to seal the through hole.

[0012] The beneficial effects of the present invention are:

[0013] 1. A circulating gas flow process is formed in the box by using the ventilation device. A part of the cold air at the top of the box will be attracted to the bottom of the box to cool down the bottom of the power battery. At the same time, the cold air at the top of the box will cool down the top of the power battery. Since the cold air will flow in the side of the box during the delivery process, that is to say, the air at the side of the box will also be cooled down, so that the air in the box can be cooled down at the same time under the flow of cold air, so that the air temperature in the box is more uniform, the cooling effect of the power battery is better, and the working efficiency is higher.

[0014] 2. The designed sealing device can be opened when the air pressure in the box is too high. When the air pressure in the box is too high and water or other substances appear outside to exert pressure on the air outlet, the sealing device will prevent the water or other substances from entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 is a cross-sectional view of the present invention;

[0017] Figure 2 Schematic diagram of the ventilation device of the first flow path of the present invention.

[0018] Figure 3 Schematic diagram of the ventilation device of the second flow path of the present invention.

[0019] Figure 4 It is a cross-sectional view of the sealing device of the present invention.

[0020] Among them: box body -1, placement box -2, cover -3, bump -4, groove -5, air outlet -6, air inlet component -7, ventilation component -8, stepping fan -9, air outlet -10, installation cavity -11, slider -12, through hole -13, cylinder -14, spring -15, air inlet -16. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] Please attach Figure 1A power battery heat dissipation device comprises a box body 1 and a ventilation device. The box body 1 comprises a placement box 2 with an open upper end face and a cover 3. The cover 3 is detachably mounted on the upper end face of the placement box 2. It is pointed out here that in order to improve the sealing effect of the box body 1, a convex block 4 is arranged on the top edge of the placement box 1, and a groove 5 is arranged at the bottom of the cover 3. The groove 5 cooperates with the convex block 4. The assembly in the form of a snap connection makes the sealing effect between the cover 3 and the placement box 2 excellent. External water cannot pass through the contact surface between the cover 3 and the placement box 2. The cover 3 and the placement box 2 are connected by bolts. The center of the cover 3 is provided with a contact with the outside cold An air inlet end 16 is connected to an air source, and an air outlet end 6 is also provided on the cover 3. The ventilation device includes an air inlet component 7, a ventilation component 8 and a stepper fan 9. The air inlet component 7 is specifically a through groove located in the bottom of the placement box 2, and the through groove is connected to the placement box 2. The ventilation component 8 is specifically a channel located in the two sides of the placement box 2. The air inlet components 7 are connected to both ends of the ventilation component 8. The ventilation component 8 is connected to the air inlet component 7 to form a channel for gas circulation. A stepper fan 9 is installed at the other end of the ventilation component 8, and a control unit is also provided. The control unit is electrically connected to the stepper fan 9 to control the forward and reverse rotation of the stepper fan 9.

[0023] Assuming that the stepping fan 9 absorbs hot air when rotating forward, please refer to the attached Figure 2 The air entering at the air inlet end 5 will be sucked into the ventilation component 8 by the stepping fan 9, and then discharged by the air inlet component 7. In this way, the cold air will be absorbed into the bottom of the placement box 2 to cool the bottom of the power battery. At the same time, the hot air at the bottom of the placement box 2 will be pushed upward. When the air pressure in the placement box 2 is too high, the gas will be discharged at the air outlet end 6, thus forming a first flow path. The first flow path uses cold air to cool the power battery. The cooling effect is obvious and more uniform, which effectively reduces the surface temperature of the power battery.

[0024] Please attach Figure 3 When the stepper fan 9 reverses, air is exhausted. When the stepper fan 9 rotates, a negative pressure is formed, so that the air intake component 7 at the bottom of the placement box 2 inhales the hot air at the bottom of the placement box 2, passes through the ventilation component 8 and is finally discharged from the air outlet 6 at the top of the placement box 2. This process is to enter and discharge the hot air at the bottom of the placement box 2, which can effectively reduce the temperature in the placement box 2 and form a second flow path. This path is used when the temperature of the power battery is not high and the outside temperature is low. If combined with cold air, the temperature in the placement box 2 can be further reduced.

[0025] Please attach Figure 4The outlet end 6 includes an outlet hole 10 and a sealing device. The outlet hole 10 runs through both sides of the groove 5, and the height of the outer outlet hole 10 is higher than the inner outlet hole 10. A mounting cavity 11 is provided on the protrusion 4. The mounting cavity 11 is connected with the outlet holes 10 on both sides. A slider 12 is slidably installed in the mounting cavity 11, and the slider 12 seals the mounting cavity. A through hole 13 is also provided on the top of the slider 12 for gas discharge. A cylinder 14 with the same diameter as the through hole 13 is provided in the mounting cavity 11. A spring 15 is also provided near the outer outlet hole 10. The spring 15 is located in the mounting cavity, pushes the slider 12 toward the inner outlet hole 10, and inserts the cylinder 14 into the through hole 13, and the through hole 13 is Sealing. Obviously, the through hole 13 is the only part of the slider 12 through which air can pass. When the air pressure in the placement box 2 is insufficient, the spring 15 is sufficient to push the slider 12 so that the cylinder 14 blocks the through hole 13. Of course, water and other substances from the outside will enter the placement box 2. When the air pressure in the placement box 2 is high enough, the slider 12 will be pushed to move outward, the through hole 13 will be separated from the cylinder 14, and the gas in the placement box 2 will be discharged. When water and other substances from the outside try to enter the placement box 2 through the through hole 13, pressure will be applied to the slider 12 to make the cylinder 14 enter the through hole 13 to prevent water from entering the placement box 2. The air discharged to the outside will also blow away the water in the through hole 13, which also plays a role in sealing.

[0026] Working principle:

[0027] The temperature of the power battery and the temperature of the outside air can be monitored in real time. The control unit cools the power according to the specific temperature. For example, when the temperature of the power battery is below 30°C, the stepper fan 9 can be selected to reverse and discharge the hot air at the bottom of the placement box 2. There is no need to use cold air for cooling. Of course, cold air can also be introduced to speed up the cooling. When the temperature of the power battery reaches above 30°C, cold air is connected and the stepper fan 9 rotates forward to cool the power battery, and the cooling effect is good.

[0028] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of 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 claims of the present invention.

Claims

1. A power battery heat dissipation device, characterized in that: It includes a box body, a ventilation device and a control unit. The box body includes a placement box with an open upper end surface and a cover. The cover is detachably installed on the upper end surface of the placement box. An air inlet end connected to an external cold air source is arranged at the center of the cover. An air outlet end is also arranged on the cover. The ventilation device includes an air inlet component, a ventilation component and a stepper fan. The air inlet component is located at the bottom of the placement box. The ventilation component is located on both sides of the placement box. Both ends of the ventilation component are connected with the air inlet component. The ventilation component is connected with the air inlet component to form a channel for gas circulation. A stepper fan is installed at the other end of the ventilation component. The control unit is electrically connected to the stepper fan to control the forward and reverse rotation of the stepper fan. A convex block is provided on the top edge of the box, and a groove is provided at the bottom of the cover, and the groove cooperates with the convex block; the air outlet end includes an air outlet hole and a sealing device, the air outlet hole runs through both sides of the groove, and the height of the outer air outlet hole is higher than that of the inner air outlet hole, and an installation cavity is provided on the convex block, and the installation cavity is connected with the air outlet holes on both sides, and a slider is slidably installed in the installation cavity, and the slider seals the installation cavity, and a through hole is also provided on the top of the slider for gas discharge, and a cylinder with the same diameter as the through hole is provided in the installation cavity, and a spring is also provided near the outer air outlet hole, and the spring is located in the installation cavity, pushes the slider toward the inner air outlet hole, and inserts the cylinder into the through hole to seal the through hole.

2. A power battery heat dissipation device according to claim 1, characterized in that: The air intake component is specifically a through groove located in the bottom of the placement box, the through groove is connected with the placement box, and the ventilation component is specifically a channel located in the two sides of the placement box.

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