CN216389523U - BDU heat radiation structure of automobile battery pack - Google Patents

Abstract

The utility model provides a BDU heat dissipation structure of an automobile battery pack, and particularly relates to the technical field of electric vehicles, which comprises the following components: overflowing the row and the heat dissipation box, overflow the row with the inside components and parts of BDU are connected, the heat dissipation box is installed overflow on the upper surface of row, be equipped with the radiating groove in the heat dissipation box, be equipped with a plurality of radiating fin in the radiating groove, the radiating medium is equipped with in the radiating groove, the radiating groove outside be equipped with a plurality of louvres on the heat dissipation box. The heat dissipation box is used for absorbing the heat transferred by the overflowing row, the heat dissipation medium is light in weight compared with a copper bar, more heat can be absorbed, the heat dissipation capacity of the BDU can be effectively improved, the heat dissipation requirement of the BDU under severe working conditions is met, the safety of the BDU is guaranteed, and the service life of the BDU is prolonged.

Description

A car battery pack BDU heat dissipation structure

technical field

The utility model relates to the technical field of electric vehicles, in particular to a BDU heat dissipation structure of an automobile battery pack.

Background technique

The Battery Disconnect Unit (BDU) is a device for disconnecting and connecting high-voltage power to the power battery of a new energy vehicle. The BDU is located inside the battery pack and is a working unit for high-voltage distribution, cut-off and short-circuit protection of the battery system. Safety plays a vital role, so it is a more critical component of new energy vehicles. BDU integrates components such as relays, pre-charging resistors, current sensors, fuses, high-voltage copper bars, low-voltage connectors, high-voltage voltage sampling connectors, wiring harness assemblies, etc. The life and safety of BDU directly affect the life and safety of battery packs, thus Affect the safety and performance of new energy vehicles.

With the rapid development of new energy vehicles, the speed of charging directly affects the user experience. Most of the best-selling new energy vehicles at this stage can charge the battery to 80% SOC in 30 minutes. In the process of fast charging, the battery The internal high-voltage part needs to withstand a very large current, and the part passing through the large current will generate a lot of electrothermal reactions, especially the high-voltage electrical connections, relays, and fuses inside the BDU generate a lot of heat due to the relatively large internal resistance. At present, the heat dissipation of BDU mainly relies on copper bars for heat dissipation, that is, adding heat dissipation copper bars to components such as relays and fuses can meet the heat dissipation requirements under normal charging and discharging conditions. Under working conditions, the temperature of relays, fuses and other components will rise sharply. Due to the limited heat dissipation capacity of the copper bars, the temperature of the entire BDU will also rise sharply, which affects the service life and safety of the BDU, and is limited by the copper bar process. , cost, space layout, electrical safety distance, lightweight and other requirements, the heat dissipation capacity of copper bars has been unable to improve.

Utility model content

The purpose of the utility model is to provide a BDU heat dissipation structure of an automobile battery pack, which can improve the heat dissipation capability of the BDU, ensure the safety of the BDU, and prolong the service life of the BDU.

In order to achieve the above purpose and other related purposes, the present invention provides a BDU heat dissipation structure for an automobile battery pack, comprising:

an overcurrent row, the overcurrent row is connected to the components inside the BDU;

a heat dissipation box, the heat dissipation box is installed on the upper surface of the overcurrent row, the heat dissipation box is provided with a heat dissipation groove, the heat dissipation groove is provided with a number of heat dissipation fins, and the heat dissipation groove is equipped with a heat dissipation medium, The heat dissipation box outside the heat dissipation slot is provided with a plurality of heat dissipation holes.

In an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation box includes a shell, a heat dissipation slot and a cover plate, the bottom of the shell is connected to the overcurrent row, and the heat dissipation slot is arranged in the shell , the opening of the heat dissipation groove is upward, the cover plate is installed at the opening of the heat dissipation groove, and the cover plate is matched with the opening of the heat dissipation groove.

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the cover plate and the heat dissipation groove are in a sealed connection.

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the bottom of the casing is provided with an overcurrent row fixing slot, and the overcurrent row is installed in the overcurrent row fixing slot.

In an example of the BDU heat dissipation structure of the automobile battery pack of the present invention, the width of the overcurrent row fixing slot is equal to the width of the overcurrent row, and the depth of the overcurrent row fixing slot is the same as the thickness of the overcurrent row. equal.

In an example of the heat dissipation structure of the vehicle battery pack BDU of the present invention, the connection between the overcurrent row and the overcurrent row fixing groove is coated with thermally conductive structural adhesive.

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the width of the heat dissipation groove is equal to the width of the overcurrent row.

In an example of the BDU heat dissipation structure of the automobile battery pack of the present invention, the heat dissipation fins are evenly distributed on the bottom surface of the heat dissipation groove, and the height of the heat dissipation fins is greater than or equal to 0.5 times the height of the heat dissipation groove, And less than or equal to 0.75 times the height of the heat sink.

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the heat dissipation fins are in the shape of straight teeth, cylindrical shape, twill shape or honeycomb shape.

In an example of the heat dissipation structure of the vehicle battery pack BDU of the present invention, the heat dissipation medium is a phase change material or a high specific heat capacity material.

In an example of the heat dissipation structure of the vehicle battery pack BDU of the present invention, the phase change enthalpy of the phase change material is greater than or equal to 140 J/g.

In an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the specific heat capacity of the high specific heat capacity material is greater than or equal to 1.2 J/(g·K).

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the heat dissipation box is made of a thermally conductive and insulating plastic material.

In an example of the BDU heat dissipation structure of the automobile battery pack of the present invention, the thermal conductivity of the thermally conductive insulating plastic material is greater than or equal to 0.8W/(m·K), and its specific heat capacity is greater than or equal to 1.2J/(g·K).

In an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation holes are vertical, the heat dissipation holes are passages penetrating the upper and lower surfaces of the heat dissipation box, and the heat dissipation holes are connected to the outer surface of the heat dissipation groove. Surface connection.

In an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the overcurrent bars are copper bars or aluminum bars, bolt holes are provided on the overcurrent bars, and the overcurrent bars are connected to the internal BDU through bolts. Component connection.

The heat dissipation structure of the automobile battery pack BDU of the present invention uses the heat dissipation box to absorb the heat transferred by the overcurrent bars. Compared with the copper bars, the heat dissipation medium is lighter in weight, can absorb more heat, and can effectively improve the The heat dissipation capacity of the BDU can meet the heat dissipation requirements of the BDU under severe working conditions, ensure the safety of the BDU, and prolong the service life of the BDU.

Description of drawings

Fig. 1 is the structural schematic diagram of the heat dissipation structure of the BDU of the automobile battery pack of the present invention;

FIG. 2 is a cross-sectional view of the heat dissipation structure of the BDU of the automobile battery pack of the present invention.

Component label description:

100 overcurrent row

110 Bolt holes

200 cooling box

210 shell

211 Thermal vents

212 Overcurrent row fixing groove

220 heat sink

221 Cooling fins

222 Cooling medium

230 Cover

300 relays

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other under the condition of no conflict. It should also be understood that the terms used in the embodiments of the present invention are used to describe specific embodiments, rather than to limit the protection scope of the present invention. In the following examples, the test methods without specific conditions are usually in accordance with conventional conditions or in accordance with the conditions suggested by various manufacturers.

When numerical ranges are given in the examples, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any number between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present utility model and those skilled in the art have mastered the prior art and the description of the present utility model, and can also use the methods, equipment, and methods in the embodiments of the present utility model. Any methods, devices and materials of the prior art with similar or equivalent materials can be used to implement the present invention.

Please refer to FIGS. 1 and 2 , FIG. 1 is a schematic structural diagram of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, and FIG. 2 is a cross-sectional view of the heat dissipation structure of the BDU of the automobile battery pack of the present invention. The utility model provides a BDU heat dissipation structure for an automobile battery pack, comprising: an overcurrent row 100 and a heat dissipation box 200, the overcurrent row 100 is connected with the components inside the BDU, and the heat dissipation box 200 is installed in the overcurrent row 100. On the upper surface of the flow row 100, the heat dissipation box 200 is provided with a heat dissipation groove 220, a number of heat dissipation fins 221 are disposed in the heat dissipation groove 220, a heat dissipation medium 222 is installed in the heat dissipation groove 220, and the heat dissipation groove 220 The heat dissipation box 200 on the outer side is provided with a plurality of heat dissipation holes 211 .

As shown in FIG. 1 , the overcurrent row 100 is installed on the relay 300 inside the BDU, and can absorb the heat generated by the relay 300 , and the heat dissipation box 200 is arranged on the overcurrent row 100 for absorbing all the heat generated by the relay 300 . The heat transferred by the flow bar 100, the heat dissipation box 200 quickly transfers the absorbed heat to the heat dissipation medium 222 through the heat dissipation fins 221. Compared with the copper bar, the heat dissipation box 200 and the heat dissipation medium 222 is light in weight and can absorb more heat, which can effectively improve the heat dissipation capacity of the BDU, meet the heat dissipation requirements of the BDU under severe working conditions, ensure the safety of the BDU, and prolong the service life of the BDU. Of course, the overcurrent bar 100 may also be installed on other components inside the BDU to enhance the heat dissipation capability of the BDU.

Referring to FIGS. 1 and 2 , in an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation box 200 includes a casing 210 , a heat dissipation slot 220 and a cover plate 230 , and the bottom of the casing 210 is connected to the overcurrent The row 100 is connected, the heat dissipation slot 220 is arranged in the housing 210, the opening of the heat dissipation slot 220 is upward, the cover plate 230 is installed at the opening of the heat dissipation slot 220, and the cover plate 230 is connected to the The openings of the heat dissipation slots 220 are matched. The cover plate 230 and the heat dissipation groove 220 are in a sealed connection. The sealing connection between the cover plate 230 and the heat dissipation groove 220 can prevent the heat dissipation medium 222 from flowing out, contaminating or damaging the components inside the BDU.

Referring to FIG. 1 , in an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the bottom of the casing 210 is provided with a flow-through fixing groove 212 , and the flow-through 100 is installed in the flow-through fixing groove 212 Inside. The width of the overflow bar fixing slot 212 is equal to the width of the overflow bar 100 , and the depth of the overflow bar fixing slot 212 is equal to the thickness of the overflow bar 100 . The overcurrent row fixing groove 212 can more stably fix the housing 210 on the overcurrent row 100 .

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, a thermal conductive structural adhesive is coated on the connection between the overcurrent row 100 and the overcurrent row fixing groove 212 . The thermally conductive structural adhesive can stably bond the casing 210 to the overcurrent row 100 , and can reduce the thermal resistance between the overcurrent row 100 and the casing 210 , so that heat can be transferred more quickly.

In an example of the heat dissipation structure of the BDU of the automobile battery pack of the present invention, the width of the heat dissipation groove 220 is equal to the width of the overcurrent row 100 . The length of the heat dissipation slot 220 can be set according to the length of the housing 210 . The larger the volume of the heat dissipation slot 220 is, the more heat dissipation medium is loaded in the heat dissipation slot 220 , and the better the heat dissipation effect is.

Referring to FIG. 2 , in an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation fins 221 are evenly distributed on the bottom surface of the heat dissipation groove 220 , and the height of the heat dissipation fins 221 is greater than or equal to 0.5 times. The height of the heat dissipation groove 220 is less than or equal to 0.75 times the height of the heat dissipation groove 220 . The heat dissipation fins 221 are straight teeth, cylindrical, twill or honeycomb. The heat dissipation fins 221 can quickly transfer the heat absorbed by the heat dissipation slot 220 to the heat dissipation medium 222, thereby enhancing the heat dissipation capability of the BDU.

In an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation medium 222 is a phase change material or a high specific heat capacity material. The phase change enthalpy of the phase change material is greater than or equal to 140 J/g. The specific heat capacity of the high specific heat capacity material is greater than or equal to 1.2 J/(g·K). The density of the heat dissipation medium 222 is much lower than that of copper. The heat dissipation medium 222 of the same volume is lighter in weight and can absorb more heat, and can improve the heat dissipation capability of the BDU as much as possible under the premise of light weight. , and the cost is lower.

In an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation box 200 is made of a thermally conductive and insulating plastic material. The thermal conductivity of the thermally conductive insulating plastic material is greater than or equal to 0.8W/(m·K), and the specific heat capacity thereof is greater than or equal to 1.2J/(g·K). The heat-dissipating box 200 is made of a thermally conductive and insulating plastic material, which can conduct heat well and has insulating properties, which can make the installation design of the heat-dissipating box 200 more flexible, not limited by the copper bar process, and more easily satisfied electrical safety requirements.

Referring to FIG. 1 , in an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the heat dissipation holes 211 are channels passing through the upper and lower surfaces of the heat dissipation box 200 . Surface connection. The heat dissipation holes 211 can effectively increase the heat dissipation area of the heat dissipation box 200 , facilitate the flow of air, and increase the heat dissipation rate of the heat dissipation box 200 .

Referring to FIG. 1 , in an example of the heat dissipation structure of the BDU for the automobile battery pack of the present invention, the overcurrent bar 100 is a copper bar or an aluminum bar, and the overcurrent bar 100 is provided with bolt holes 110 . 100 is connected to the components inside the BDU through bolts.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims (10)

1. The utility model provides an automobile battery package BDU heat radiation structure which characterized in that includes:

the overcurrent bar is connected with the components inside the BDU;

the heat dissipation box is installed on the upper surface of the overflowing row, a heat dissipation groove is formed in the heat dissipation box, a plurality of radiating fins are arranged in the heat dissipation groove, a radiating medium is arranged in the heat dissipation groove, and a plurality of radiating holes are formed in the heat dissipation box and outside the heat dissipation groove.

2. The BDU heat dissipation structure of automobile battery pack as claimed in claim 1, wherein the heat dissipation box comprises a housing, a heat dissipation groove and a cover plate, the bottom of the housing is connected with the overflow row, the heat dissipation groove is arranged in the housing, the opening of the heat dissipation groove faces upwards, the cover plate is arranged at the opening of the heat dissipation groove, and the cover plate is matched with the opening of the heat dissipation groove.

3. The BDU heat dissipation structure for vehicle battery packs as claimed in claim 2, wherein the cover plate is hermetically connected to the heat dissipation groove.

4. The BDU heat dissipation structure for vehicle battery pack according to claim 2, wherein the bottom of the housing is formed with a flow bar fixing groove, the flow bar is installed in the flow bar fixing groove, and the width of the heat dissipation groove is equal to the width of the flow bar.

5. The BDU heat dissipation structure of an automobile battery pack is characterized in that the joint of the overflowing row and the overflowing row fixing groove is coated with heat conduction structural adhesive.

6. The BDU heat dissipation structure for vehicle battery packs as claimed in claim 1, wherein the heat dissipation fins are uniformly distributed on the bottom surface of the heat dissipation groove.

7. The BDU heat dissipation structure of automobile battery pack as claimed in claim 1, wherein the heat dissipation medium is a phase change material or a high specific heat capacity material, the enthalpy of phase change of the phase change material is greater than or equal to 140J/g, and the specific heat capacity of the high specific heat capacity material is greater than or equal to 1.2J/(g-K).

8. The BDU heat dissipation structure of an automobile battery pack according to claim 1, wherein the heat dissipation box is made of a heat conductive and insulating plastic material, the heat conductivity of the heat conductive and insulating plastic material is greater than or equal to 0.8W/(m-K), and the specific heat capacity of the heat conductive and insulating material is greater than or equal to 1.2J/(g-K).

9. The BDU heat dissipation structure of vehicle battery pack as claimed in claim 1, wherein the heat dissipation holes are holes penetrating the upper and lower surfaces of the heat dissipation box, and the heat dissipation holes are connected to the outer surface of the heat dissipation groove.

10. The BDU heat dissipation structure of automobile battery pack is characterized in that the overflow row is a copper row or an aluminum row, bolt holes are formed in the overflow row, and the overflow row is connected with components inside the BDU through bolts.

Images