A heat dissipation structure of a battery pack

Abstract

The application discloses a heat dissipation structure of a battery pack, which comprises an upper cover, a plurality of trapezoidal air inlets are formed in the outer surface of the upper cover, a lower cover is arranged below the upper cover, a plurality of heat dissipation holes are formed in the lower cover, an electric core support is arranged between the upper cover and the lower cover, air guide holes are formed below the trapezoidal air inlets of the support, the air guide holes are embeddedly connected with the upper cover, an electric core group is composed of a plurality of electric cores connected in series, a PCB is arranged above the electric core support and covers the top area of the electric core support, the electric core support, the lower cover and the PCB form a cavity for accommodating the electric core group, air can enter the cavity through the trapezoidal air inlets and the air guide holes to cool the electric core group and the PCB, and finally, the air is discharged from the heat dissipation holes.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and in particular to a heat dissipation structure for a battery pack. Background Technology

[0002] Currently, many power tools use battery packs that can be detached from the machine as their power source. These battery packs consist of a housing, a battery pack installed inside the housing, a circuit board that controls the discharge and charging of the battery pack, and an interface for electrical connection with the charger and the power tool.

[0003] As proposed in CN209544558U, a battery pack with an enhanced active cooling airflow structure utilizes the charger's ventilation structure to blow cool air into the upper and lower shells of the battery pack to cool its interior. However, the air inlet and outlet are designed as a straight channel. When the sizes of the two are mismatched, the surrounding panels will obstruct the airflow and affect the air circulation. Furthermore, after the air enters the air inlet connection hole, it directly cools the cells directly below, while the cells and PCB board above receive less airflow and have poor heat dissipation. Therefore, the purpose of this application is to solve the above problems.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0005] Based on this, this application provides a heat dissipation structure for a battery pack to solve one of the aforementioned technical problems.

[0006] The technical solution adopted by this application to solve its technical problem is a heat dissipation structure for a battery pack, comprising: an upper cover with several trapezoidal air inlets on its outer surface; a lower cover disposed below the upper cover with heat dissipation holes; a cell support frame disposed between the upper cover and the lower cover support frame, wherein the support frame has an air guide port below the trapezoidal air inlets, and the air guide port is fitted and connected to the upper cover; a cell assembly composed of multiple cells connected in series; and a PCB board disposed above the cell support frame and covering the top area of ​​the cell support frame; the cell support frame, the lower cover, and the PCB board together form a cavity for accommodating the cell assembly, through which air can enter from the trapezoidal air inlets and through the air guide port into the cavity to cool the cell assembly and the PCB board, and finally be discharged from the heat dissipation holes.

[0007] In some embodiments, a male stop is provided on the edge of the air guide of the battery cell bracket, and a female stop is provided below the trapezoidal air inlet to cooperate with the male stop. The battery cell bracket and the top cover are connected by the fitting between the male stop and the female stop.

[0008] In some embodiments, the cell support is composed of a left support and a right support, and the top of the left support and the right support are provided with a flow guide shell covering the top of a single cell. The flow guide shell can form a flow guide channel with the inner wall of the air duct.

[0009] In some embodiments, the top of the flow guide housing has a groove, and the PCB board can cover the area of ​​the groove.

[0010] In some embodiments, the battery cell has two layers, and a flow-guiding slope is formed on the side of the battery cell support away from the battery cell assembly, which can guide air to the space between the two battery cell layers.

[0011] In some embodiments, the heat dissipation holes are located at the bottom of the lower cover and on the side away from the trapezoidal air inlet of the upper cover.

[0012] In some embodiments, the bottom of the lower cover has several small holes on both sides to assist in heat dissipation.

[0013] The beneficial effects of this application are as follows: A trapezoidal air inlet is designed on the top cover to guide the air blown in by the charger into the battery cell assembly, enhancing airflow. Simultaneously, the cavity is formed by left and right supports cooperating to create an interlocking structure between the air guide vent and the trapezoidal air inlet on the top cover, allowing air to enter along the air guide groove. Under the action of the air guide shell and the inclined air guide surface, the airflow flows within the cavity, carrying away heat from the battery cells and PCB board. The heat generated by the battery pack is then dissipated through the heat dissipation holes and small holes on the bottom cover. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of this application.

[0016] Figure 2 This is a cross-sectional view of this application.

[0017] Figure 3 yes Figure 2 A magnified view of part A.

[0018] Figure 4 This is a schematic diagram of the cell support structure of this application.

[0019] Figure 5 This is a schematic diagram of the bottom structure of the cover in this application.

[0020] The following are the symbols and their meanings: 1. Top cover; 11. Trapezoidal air inlet; 111. Female stop; 2. Bottom cover; 21. Heat dissipation hole; 22. Small hole; 3. Battery cell bracket; 31. Air guide; 311. Male stop; 32. Left bracket; 33. Right bracket; 34. Air guide shell; 341. Groove; 342. Air guide slope; 4. Battery cell assembly; 5. PCB board. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0022] In the embodiments of this application, please refer to Figure 1-5 As shown, this application provides a heat dissipation structure for a battery pack, mainly comprising: an upper cover 1, on the outer surface of which are provided several trapezoidal air inlets 11; a lower cover 2, disposed below the upper cover 1, on which are provided heat dissipation holes 21; a cell support 3, disposed between the upper cover 1 and the lower cover 2 support, the support having an air guide 31 below the trapezoidal air inlets 11, the air guide 31 being fitted and connected to the upper cover 1; a cell assembly 4, composed of multiple cells connected in series; and a PCB board 5, disposed above the cell support 3 and covering the top area of ​​the cell support 3; the cell support 3, the lower cover 2, and the PCB board 5 together form a cavity for accommodating the cell assembly 4, through which air can enter from the trapezoidal air inlets 11 and pass through the air guide 31 into the cavity to cool the cell assembly 4 and the PCB board 5, and finally be discharged from the heat dissipation holes 21.

[0023] For illustration, the air intake method of the battery pack refers to a battery pack with an enhanced active heat dissipation air duct structure proposed in CN209544558U. After the battery pack is inserted into the charger, the trapezoidal air intake hole on the top cover 1 is aligned and connected with the exhaust port of the charger's ventilation mechanism. When the charger starts charging the battery pack, the charger's ventilation mechanism is activated, drawing in air and blowing it into the trapezoidal air intake 11 of the battery pack through the charger's exhaust port.

[0024] Specifically, compared to traditional rectangular or circular air inlets, the trapezoidal structure reduces wind resistance and prevents airflow from generating vortices at the inlet, thereby improving airflow efficiency. The fitted connection between the top cover 1 and the cell support 3 allows the air entering the trapezoidal air inlet 11 to flow completely into the cavity. The air passes over the surface of the cell and flows on the surface of the cylindrical cell, and passes through the PCB board 5, forming a low-inlet, high-outlet airflow path. This avoids airflow short-circuiting and ensures that the cold air flows fully through the cell assembly 4 before being discharged.

[0025] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0026] Reference Figure 3 As shown, a male stop 311 is provided on the edge of the air guide 31 of the cell bracket 3, and a female stop 111 that mates with the male stop 311 is provided below the trapezoidal air inlet 11. The cell bracket 3 and the upper cover 1 are connected by the fitting between the male stop 311 and the female stop 111. This arrangement can improve the structural stability, reduce airflow leakage, and ensure that the air flows to the cell group 4 and the PCB board 5 in a concentrated manner.

[0027] Reference Figure 4 As shown, the cell support 3 is composed of a left support 32 and a right support 33. The top of the left support 32 and the right support 33 is provided with a flow guide shell 34 covering the top of a single cell. The flow guide shell 34 can form a flow guide channel with the inner wall of the air guide 31. The flow guide channel can restrict the air from entering from the air guide 31 and concentrate it to flow at one angle, thereby enhancing air flow.

[0028] Specifically, the top of the airflow guide shell 34 has a groove 341, and the PCB board 5 can cover the area of ​​the groove 341. With this configuration, when the air flows, the cold air will pass through the inner wall of the cavity, so that the PCB board 5 located on the top of the airflow guide shell 34 can also be cooled down.

[0029] Reference Figure 2-3 As shown, the battery cell has two layers. The battery cell support 3 has a flow guiding slope 342 on the side away from the battery cell assembly 4. The flow guiding slope 342 can guide air to the gap between the two battery cells.

[0030] Preferably, in order to allow air to pass through all the battery cells after entering the cavity from the air vent 31, the heat dissipation hole 21 is located at the bottom of the lower cover 2 and on the side away from the trapezoidal air inlet 11 of the upper cover 1.

[0031] Preferably, the bottom of the lower cover 2 has several small holes 22 on both sides to assist the heat dissipation holes 21 in dissipating heat. The auxiliary heat dissipation holes 22 added to both sides of the lower cover 2 can further accelerate the exhaust of hot air and improve the overall heat dissipation capacity. Various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A heat dissipation structure for a battery pack, characterized in that, include: The top cover has several trapezoidal air inlets on its outer surface; The lower cover is located below the upper cover, and the lower cover has heat dissipation holes. A cell support is provided between the upper cover and the lower cover support. The support has an air guide port below the trapezoidal air inlet, and the air guide port is fitted and connected to the upper cover. A battery cell assembly consists of multiple battery cells connected in series. A PCB board is disposed above the cell support and covers the top area of ​​the cell support; The battery cell bracket, lower cover, and PCB board together form a cavity to accommodate the battery cell assembly. Air can enter from the trapezoidal air inlet and pass through the air guide to enter the cavity to cool the battery cell assembly and PCB board, and finally be discharged from the heat dissipation holes.

2. The heat dissipation structure of a battery pack according to claim 1, characterized in that, The battery cell bracket has a male stop on the edge of the air vent, and a female stop that mates with the male stop is provided below the trapezoidal air inlet. The battery cell bracket and the top cover are connected by the fitting of the male stop and the female stop.

3. The heat dissipation structure of a battery pack according to claim 1, characterized in that, The battery cell support consists of a left support and a right support. The top of the left support and the right support is provided with a flow guide shell covering the top of a single battery cell. The flow guide shell can form a flow guide channel with the inner wall of the air duct.

4. The heat dissipation structure of a battery pack according to claim 3, characterized in that, The top of the flow guide shell has a groove, and the PCB board can cover the area of ​​the groove.

5. The heat dissipation structure of a battery pack according to claim 3, characterized in that, The battery cell has two layers, and a flow-guiding slope is formed on the side of the battery cell support away from the battery cell assembly. The flow-guiding slope can guide air to the space between the two battery cell layers.

6. The heat dissipation structure of a battery pack according to claim 1, characterized in that, The heat dissipation holes are located at the bottom of the lower cover and on the side away from the trapezoidal air inlet of the upper cover.

7. The heat dissipation structure of a battery pack according to claim 1, characterized in that, The bottom of the lower cover has several small holes on both sides to assist in heat dissipation.

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