Heat dissipation type electric tool lithium battery pack

Abstract

The utility model relates to the technical field of lithium battery packs, in particular to a heat dissipation type electric tool lithium battery pack which comprises a battery pack shell and a protection frame, the battery pack shell is fixedly installed in an inner cavity of the protection frame, and the two sides and the bottom of the battery pack shell are each fixedly provided with a heat dissipation device. The inner wall of the protection frame is fixedly connected with a plurality of buffer devices, the heat dissipation device comprises a cooling row, an inner cavity of the cooling row is fixedly connected with a plurality of cooling fins, the two sides of the cooling row are fixedly connected with three heat conduction pipes respectively, one end of each heat conduction pipe is located in the battery pack shell, and the other end of each heat conduction pipe is located in the battery pack shell. According to the lithium battery heat dissipation device, the heat dissipation efficiency of the lithium battery shell is improved through the heat dissipation device, the lithium battery heat dissipation device is convenient to use, heat dissipation media do not need to be added, the service life of a lithium battery is prolonged, and meanwhile the heat dissipation mode is simpler, more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery packs, in particular to a heat dissipation type lithium battery pack for electric tools. Background Art

[0002] With the progress of society, portable power tools are more and more widely used in our lives. The battery technology as the source of power is also constantly developing. The development of portable power tools shows a trend of miniaturization, lightness and cordlessness, which makes lithium batteries have a good growth in the field of power tools. At present, most of the power tools combined with lithium battery packs on the market are generally installed at the lower end of the power tool through the plug-in part, and the power energy of the power tool is transmitted through the plug-in part to power the power tool.

[0003] The Chinese patent with publication number CN218769725U provides a heat dissipation type electric tool lithium battery pack. The utility model reduces the temperature through the heat dissipation frame on the lithium battery pack, reduces the heat generated by the electric tool during use, increases the service life of the lithium battery pack, and improves work efficiency.

[0004] In addition to the above-mentioned advantages, this utility model patent still has some shortcomings: first, the device dissipates heat by adding a medium in the heat dissipation frame, but the medium is a consumable and needs to be replaced frequently, which is inconvenient to use; second, in order to achieve a longer battery life and usage time, some lithium battery packs are larger in size and heavier in weight. Because the power tool is often moved during use, it also produces violent vibrations, which makes it easy to drop it and cause damage to the lithium battery pack. Utility Model Content

[0005] The purpose of the utility model is to provide a heat dissipation type electric tool lithium battery pack to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A heat dissipation type electric tool lithium battery pack comprises a battery pack shell and a protective frame, wherein the inner cavity of the protective frame is fixedly installed with the battery pack shell, and a heat dissipation device is fixedly installed on both sides and the bottom of the battery pack shell, and a plurality of buffer devices are fixedly connected to the inner wall of the protective frame, and the heat dissipation device comprises a cold row, and a plurality of heat sinks are fixedly connected to the inner cavity of the cold row, and three heat conducting pipes are fixedly connected to the two sides of the cold row respectively, one end of the heat conducting pipe is located inside the battery pack shell, and the other end of the heat conducting pipe passes through a plurality of heat sinks, and two bellows are fixedly connected to one side of the cold row, and a servo motor is fixedly connected to the interior of the bellows, and a drive shaft is fixedly connected to the output end of the servo motor, and a fan is fixedly connected to one end of the drive shaft.

[0008] Preferably, the buffer device includes an oil storage tank, the inner cavity of the oil storage tank is movably connected to a pressure reducing plate, the center of one side of the pressure reducing plate is fixedly connected to a linkage shaft, one end of the inner cavity of the oil storage tank is fixedly connected to a sealing cover, one side of the sealing cover is fixedly connected to a fixing plate, one side of the fixing plate is fixedly connected to a spring, one end of the linkage shaft is fixedly connected to a pressure cover, and one end of the pressure cover is in contact with the surface of the battery pack shell.

[0009] Preferably, two heat dissipation openings are provided on both sides and the bottom of the protection frame, and the bellows is located in the inner cavity of the heat dissipation openings.

[0010] Preferably, a plurality of flow openings are provided on the back side of the bellows, and the number of the flow openings is the same as the number of the heat sinks and corresponds one to one.

[0011] Preferably, one side of the pressure reducing plate is provided with a number of oil filter holes penetrating the pressure reducing plate, and the inner cavity of the oil storage tank is filled with shock absorbing oil.

[0012] Preferably, an outer edge of one side of the sealing cover is transitionally matched with an inner wall of one end of the oil storage tank.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. In the utility model, a heat dissipation device is provided to increase the heat dissipation efficiency of the lithium battery housing, and the use is more convenient without adding a heat dissipation medium, thereby increasing the service life of the lithium battery and making the heat dissipation method simpler, more convenient and faster;

[0015] 2. In the present invention, when a lithium battery falls or collides, it is first protected by a protective frame. At the same time, a buffer device is provided to buffer the impact force and reaction force on the lithium battery, thereby improving the anti-collision and anti-fall capabilities of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is an exploded schematic diagram of the overall structure of the utility model;

[0018] Figure 3 For this utility model Figure 2 The overall structural diagram of the heat dissipation device;

[0019] Figure 4 For this utility model Figure 2 The overall structural diagram of the middle buffer device;

[0020] In the figure: 1. battery pack shell; 2. protection frame; 3. heat dissipation device; 4. buffer device; 21. heat dissipation port; 31. radiator; 32. heat sink; 33. heat pipe; 34. bellows; 35. servo motor; 36. drive shaft; 37. fan; 38. circulation port; 41. oil storage tank; 42. pressure relief plate; 43. sealing cover; 44. linkage shaft; 45. fixing plate; 46. spring; 47. pressure cover. DETAILED DESCRIPTION

[0021] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0022] See also Figure 1-3 , the utility model provides a technical solution:

[0023] A heat dissipation type electric tool lithium battery pack comprises a battery pack shell 1 and a protective frame 2, wherein the inner cavity of the protective frame 2 is fixedly mounted with the battery pack shell 1, both sides and the bottom of the battery pack shell 1 are fixedly mounted with a heat dissipation device 3, a plurality of buffer devices 4 are fixedly connected to the inner wall of the protective frame 2, the heat dissipation device 3 comprises a cold row 31, a plurality of heat sinks 32 are fixedly connected to the inner cavity of the cold row 31, three heat pipes 33 are fixedly connected to both sides of the cold row 31, one end of the heat pipe 33 is located inside the battery pack shell 1, and the other end of the heat pipe 33 passes through a plurality of heat sinks 32, two bellows 34 are fixedly connected to one side of the cold row 31, a servo motor 35 is fixedly connected to the interior of the bellows 34, a drive shaft 36 is fixedly connected to the output end of the servo motor 35, and a fan 37 is fixedly connected to one end of the drive shaft 36.

[0024] In this embodiment, please refer to Figure 4 The buffer device 4 includes an oil storage tank 41, the inner cavity of the oil storage tank 41 is movably connected with a pressure reducing plate 42, a linkage shaft 44 is fixedly connected to the center of one side of the pressure reducing plate 42, a sealing cover 43 is fixedly connected to one end of the inner cavity of the oil storage tank 41, a fixing plate 45 is fixedly connected to one side of the sealing cover 43, a spring 46 is fixedly connected to one side of the fixing plate 45, one end of the linkage shaft 44 is fixedly connected to a pressure cover 47, and one end of the pressure cover 47 contacts with the surface of the battery pack shell 1.

[0025] In this embodiment, please refer to Figure 2-3 Two heat dissipation ports 21 are provided on both sides and the bottom of the protection frame 2. The bellows 34 is located in the inner cavity of the heat dissipation ports 21, which is beneficial for providing space for high-speed air circulation through the heat dissipation ports 21, so as to facilitate heat dissipation to the outside.

[0026] In this embodiment, please refer to Figure 3A number of flow openings 38 are provided on the back of the bellows 34. The number of the flow openings 38 is the same as the number of the heat sinks 32 and corresponds one to one, which is conducive to evenly circulating air on the surface of each heat sink 32, making the heat dissipation of the heat sink 32 more uniform and ensuring the heat dissipation effect.

[0027] In this embodiment, please refer to Figure 4 A number of oil filter holes are provided on one side of the pressure reducing plate 42 and penetrate the plate. The inner cavity of the oil storage tank 41 is filled with shock-absorbing oil. When the pressure reducing plate 42 moves along the inner cavity of the oil storage tank 41, the shock-absorbing oil is squeezed through the oil filter holes, thereby generating a damping force and slowing down the movement speed of the pressure reducing plate 42.

[0028] In this embodiment, please refer to Figure 4 The outer edge of one side of the sealing cover 43 is transitionally matched with the inner wall of one end of the oil storage tank 41, which is beneficial to prevent the shock absorber oil in the oil storage tank 41 from leaking from the connection between the sealing cover 43 and the oil storage tank 41.

[0029] Working principle of this utility model:

[0030] Step 1, in the utility model, when the lithium battery is working, since the heat pipe 33 passes through the shell of the lithium battery, the heat of the lithium battery shell is transferred to the heat sink 32 through the thermal conductivity of the heat pipe 33, and the servo motor 35 is used to give power to control the high-speed rotation of the drive shaft 36, and the high-speed rotation of the drive shaft 36 drives the fan 37 to rotate at a high speed. Since the fan blades of the fan 37 have a certain inclination angle, when the air passes through, the air on one side of the fan blade goes in a straight line, and the air on the other side follows the oblique line of the blade. Under the same time, the air flow rate on the oblique line side must be faster than the air flow rate on the straight line, resulting in different air pressures on both sides. The straight-line air will continuously flow to the oblique side of the air, and the air flow forms wind, thereby accelerating the convection speed between the heat sink 32 and the air, so that the temperature on the surface of the heat sink 32 can be quickly dissipated, so that the heat of the lithium battery shell continues to be absorbed through the heat pipe 33, and the cycle is repeated, so that the lithium battery is kept working at a constant temperature;

[0031] Step 2, in the present invention, when the lithium battery falls or hits, the pressure cover 47 moves backward under pressure, and the pressure cover 47 moves backward to drive the linkage shaft 44 to move backward, and squeezes the spring 46 to deform it, and the linkage shaft 44 moves backward to push the pressure relief plate 42 to move backward along the inner wall of the oil storage tank 41. Since the inner cavity of the oil storage tank 41 is filled with shock-absorbing oil, when the pressure relief plate 42 moves backward, the shock-absorbing oil is compressed, so that the shock-absorbing oil is squeezed out through the oil filter hole opened on the surface of the pressure relief plate 42, thereby generating The damping force slows down the movement speed of the pressure relief plate 42, and the backward movement speed of the pressure cover 47 is slowed down by slowing down the movement speed of the pressure relief plate 42, thereby alleviating part of the impact force. After the impact disappears, the spring 46 loses pressure and returns to its original state, thereby lifting the pressure cover 47 to move forward, and the pressure cover 47 moves forward to enable the linkage shaft 44 to drive the pressure relief plate 42 to move forward. Due to the existence of the damping force, the forward movement speed of the pressure relief plate 42 is slowed down, thereby slowing down the forward movement speed of the pressure cover 47, thereby buffering part of the reaction force.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. The utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A heat dissipation type electric tool lithium battery pack, comprising a battery pack housing (1) and a protective frame (2), characterized in that: A battery pack shell (1) is fixedly installed in the inner cavity of the protection frame (2), a heat dissipation device (3) is fixedly installed on both sides and the bottom of the battery pack shell (1), a plurality of buffer devices (4) are fixedly connected to the inner wall of the protection frame (2), the heat dissipation device (3) comprises a cold row (31), a plurality of heat sinks (32) are fixedly connected to the inner cavity of the cold row (31), three heat conduction pipes (33) are fixedly connected to both sides of the cold row (31), one end of the heat conduction pipe (33) is located inside the battery pack shell (1), and the other end of the heat conduction pipe (33) passes through the plurality of heat sinks (32), one side of the cold row (31) is fixedly connected to two bellows (34), the interior of the bellows (34) is fixedly connected to a servo motor (35), the output end of the servo motor (35) is fixedly connected to a drive shaft (36), and one end of the drive shaft (36) is fixedly connected to a fan (37).

2. A heat dissipation type electric tool lithium battery pack according to claim 1, characterized in that: The buffer device (4) comprises an oil storage tank (41), the inner cavity of the oil storage tank (41) is movably connected to a pressure relief plate (42), a linkage shaft (44) is fixedly connected to the center of one side of the pressure relief plate (42), one end of the inner cavity of the oil storage tank (41) is fixedly connected to a sealing cover (43), one side of the sealing cover (43) is fixedly connected to a fixing plate (45), one side of the fixing plate (45) is fixedly connected to a spring (46), one end of the linkage shaft (44) is fixedly connected to a pressure cover (47), and one end of the pressure cover (47) contacts the surface of the battery pack shell (1).

3. The heat dissipation type electric tool lithium battery pack according to claim 1, characterized in that: Two heat dissipation openings (21) are provided on both sides and the bottom of the protection frame (2), and the bellows (34) is located in the inner cavity of the heat dissipation openings (21).

4. The heat dissipation type electric tool lithium battery pack according to claim 1, characterized in that: A plurality of flow openings (38) are provided on the back of the wind box (34), and the number of the flow openings (38) is the same as the number of the heat sinks (32) and corresponds one to one.

5. The heat dissipation type electric tool lithium battery pack according to claim 2, characterized in that: A plurality of oil filter holes are formed on one side of the pressure reducing plate (42) and penetrate the pressure reducing plate (42). The inner cavity of the oil storage tank (41) is filled with shock absorbing oil.

6. The heat dissipation type electric tool lithium battery pack according to claim 2, characterized in that: An outer edge of one side of the sealing cover (43) is transitionally matched with an inner wall of one end of the oil storage tank (41).

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