Battery pack of electric tool and electric tool

Abstract

The utility model provides a battery pack of an electric tool, which belongs to the technical field of electric equipment and comprises a box body, a battery pack cover and a battery pack, the battery is located in the mounting cavity, and an output end is arranged on the box body and electrically connected with the battery; the flow guide part comprises a positive electrode flow guide part and a negative electrode flow guide part, the positive electrode flow guide part is electrically connected with the positive electrode of the battery and the positive electrode of the output end, the negative electrode flow guide part is electrically connected with the negative electrode of the battery and the negative electrode of the output end, the positive electrode flow guide part comprises one of flow guide sheets or flow guide strips, and the negative electrode flow guide part comprises one of flow guide sheets or flow guide strips; the battery box has the advantages that a connecting wire in the existing battery box is replaced by the sheet-shaped or strip-shaped diversion piece, so that the sectional area of the conductive connecting piece between the output end and the battery is increased, the resistance value of a current loop is reduced, and a current with a higher value can be output under the same voltage; and the contact area with the outside can be increased due to the existence of the flow guide sheets and the flow guide strips, so that the heat dissipation efficiency is improved, and the charging / discharging efficiency of the battery pack is improved. The utility model further provides an electric tool.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the electric tool mechanical technical field especially relates to a battery pack of electric tool and electric tool. BACKGROUND

[0002] Electric tools are widely used in the fields of building, housing decoration, automobile assembly, engineering machinery, electric power, metallurgy, mine, bridge, gardening and so on, and a large number of electric tools enter the family. Electric tools can adopt various power supply modes, and a commonly used power supply mode is that electric tools are attached with external power supply devices so that the power supply devices supply power for the electric tools.

[0003] In the scheme of using external power supply devices, the output end is generally electrically connected with the power supply in the shell, and when the output end is fixed with the electric tool, the output end on the power supply device is plugged with the input end on the electric tool to be electrified. However, in the above power supply device, the electrical connection between the power supply in the shell and the output end can only be connected through the connecting wire, and the diameter of the connecting wire is relatively small, so that the resistance value is relatively high when the connecting wire is used as a conductive connecting piece, and the current output efficiency is not high under the same voltage. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at the above problems existing in the prior art, and provides a battery pack capable of reducing the resistance value of the conductive connecting piece for electrification between the power supply and the output end.

[0005] The utility model discloses a battery pack of electric tool, which comprises:

[0006] A box body is internally provided with a mounting cavity;

[0007] A battery is located in the mounting cavity, and an output end is electrically connected with the battery on the box body;

[0008] A flow guide piece comprises a positive electrode flow guide part and a negative electrode flow guide part, the positive electrode flow guide part is electrically connected with the positive electrode of the battery and the positive electrode of the output end, the negative electrode flow guide part is electrically connected with the negative electrode of the battery and the negative electrode of the output end, the positive electrode flow guide part comprises one of a flow guide sheet or a flow guide strip, and the negative electrode flow guide part comprises one of a flow guide sheet or a flow guide strip; the flow guide piece is used for reducing the internal resistance of the current loop, reducing the heat of the loop and improving the charge / discharge efficiency of the battery pack.

[0009] In the above battery pack of electric tool, the mounting cavity is provided with a mounting plate, the output end and the flow guide piece are mounted on the mounting plate, and the mounting plate is used for fixing the positive electrode flow guide part and / or the negative electrode flow guide part.

[0010] In the battery pack of the electric tool, the positive current guide part and / or the negative current guide part is provided with an overload protection part for protecting the current guide part from overload.

[0011] In the battery pack of the electric tool, the current guide part is electrically connected with a current sampling module for sampling the current of the current guide part.

[0012] In the battery pack of the electric tool, the positive current guide part and / or the negative current guide part is provided with a positioning sheet, and the mounting plate is provided with a positioning hole, and the positioning sheet is inserted into the positioning hole.

[0013] In the battery pack of the electric tool, the electrode of the battery is electrically connected with a connecting part, and the electrode of the output end is fixedly provided with a connecting end, and the connecting end and the connecting part are electrically connected through the positive current guide part or the negative current guide part.

[0014] In the battery pack of the electric tool, when the positive current guide part and / or the negative current guide part comprises a current guide sheet, the connecting sheet is integrally arranged on the current guide sheet, the connecting end is provided with a positioning notch, the connecting sheet passes through the positioning notch, and the connecting sheet abuts against the positioning notch.

[0015] In the battery pack of the electric tool, the end of the connecting part is bent and also passes through the positioning notch, and the connecting part does not contact the inner side wall of the positioning notch, and the end of the connecting part abuts against the connecting sheet.

[0016] In the battery pack of the electric tool, the positive current guide part and / or the negative current guide part is provided with a voltage detection module, and the voltage detection module is connected with a control module.

[0017] The electric tool comprises the battery pack of the electric tool.

[0018] Compared with the prior art, the beneficial effects of the battery pack of the electric tool are that: the current guide part in the form of a sheet or a strip is used to replace the connecting wire in the existing battery box, the cross-sectional area of the conductive connecting part between the output end and the battery is increased, the resistance value of the current loop is reduced, and under the same voltage, a higher value of current can be output; and the existence of the current guide sheet and the current guide strip can also increase the contact area with the outside, thereby increasing the heat dissipation efficiency and improving the charging / discharging efficiency of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of the three-dimensional structure of the battery pack.

[0020] Figure 2 It is Figure 1the internal structure schematic view of the battery pack;

[0021] Figure 3 is Figure 2 the local enlarged schematic view at A in the battery pack;

[0022] Figure 4 is Figure 1 the cross-sectional structure schematic view of the battery pack;

[0023] Figure 5 is the connection explosion schematic view between the mounting plate and the flow guide piece;

[0024] Figure 6 is one of the implementation schematic views of the overload protector;

[0025] Figure 7 is the second implementation schematic view of the overload protector.

[0026] In the figure, the box body 100; the mounting cavity 101; the mounting plate 102; the positioning hole 103; the output end 104; the connection end 105; the positioning notch 106; the battery 200; the connection part 201; the positive flow guide part 300; the negative flow guide part 301; the flow guide piece 302; the flow guide strip 303; the positioning piece 304; the connection piece 305; the welding through slot 306. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the utility model and is combined with the drawings, and the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0028] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0029] As Figures 1-6 shown, a battery pack of an electric tool includes:

[0030] The box body 100 is internally provided with the mounting cavity 101;

[0031] The battery 200 is located in the mounting cavity 101, and the box body 100 is provided with the output end 104 electrically connected with the battery 200;

[0032] The flow guide piece includes a positive flow guide part 300 and a negative flow guide part 301, the positive flow guide part 300 is electrically connected with the positive pole of the battery 200 and the positive pole of the output terminal 104, the negative flow guide part 301 is electrically connected with the negative pole of the battery 200 and the negative pole of the output terminal 104, the positive flow guide part 300 includes one of the flow guide sheet 302 or the flow guide strip 303, and the negative flow guide part 301 includes one of the flow guide sheet 302 or the flow guide strip 303.

[0033] In the embodiment, the flow guide piece in the form of sheet or strip is used to replace the connecting wire in the existing battery box, the cross-sectional area of the conductive connection between the output terminal 104 and the battery 200 is increased, the resistance value of the current loop is reduced, and a higher current value can be output under the same voltage; and the existence of the flow guide sheet 302 and the flow guide strip 303 can also increase the contact area with the outside, thereby increasing the heat dissipation efficiency and improving the charge / discharge efficiency of the battery pack.

[0034] Specifically, the current loop refers to the current path between the output terminal 104 and the positive and negative poles of the battery 200.

[0035] It is worth mentioning that the positive flow guide part 300 and the negative flow guide part 301 are preferably flow guide sheets 302, which have a larger heat dissipation area, and for some spaces with limited installation area, the flow guide strip 303 can be selected.

[0036] As shown in Figure 2 , as one of the embodiments, the positive pole of the output terminal 104 is connected with the positive pole of the battery 200 through the flow guide sheet 302, and the negative pole of the output terminal 104 is connected with the negative pole of the battery 200 through the flow guide strip 303; as shown in Figure 7 , as one of the embodiments, the positive pole of the output terminal 104 is connected with the positive pole of the battery 200 through the flow guide sheet 302, and the negative pole of the output terminal 104 is connected with the negative pole of the battery 200 through the flow guide strip 303

[0037] As preferred, the mounting cavity 101 is provided with a mounting plate 102, and the output terminal 104 and the flow guide piece are mounted on the mounting plate 102, and the mounting plate 102 is used to fix the positive flow guide part 300 and / or the negative flow guide part 301.

[0038] In the embodiment, the mounting plate 102 of the mounting cavity 101 divides the mounting cavity 101 into two parts, one part is used to mount the battery 200, and the other part is used to mount the output terminal 104 and the flow guide piece, the output terminal 104 and the flow guide piece are located at the upper end surface of the mounting plate 102, and the battery 200 is located at the lower end of the mounting plate 102, so that the battery 200 does not contact the output terminal 104 and the flow guide piece, and there is no direct conduction phenomenon.

[0039] Specifically, the material of the conductive member can be selected from silver, aluminum, copper and the like; the mounting plate 102 is a circuit board, and the conductive fins 302 or the conductive strips 303 can be formed by directly soldering on the mounting plate 102.

[0040] Further preferably, the positive conductive part and / or the negative conductive part is provided with an overload protection part, such as Figure 6 As shown, the overload protection part includes a fuse 308, the positive conductive part 300 includes two conductive fins 302, and the two conductive fins 302 are electrically connected by the fuse 308; or as Figure 7 As shown, the "V"-shaped melting gap 307 is symmetrically formed on the conductive fin 302, and when the current is overloaded, the cross section of the gap will heat and melt, achieving the function of the fuse.

[0041] As preferred, the conductive member is electrically connected with a current sampling module for sampling the current of the conductive member; it is worth mentioning that the battery pack is also provided with a current sampling module and a control module, and the conductive member is electrically connected with the current sampling module and the control module, and the current sampling module can be selected from a current transformer, a Hall effect sensor and other measuring components to achieve the above-mentioned current sampling function.

[0042] Further preferably, the positive conductive part 300 and / or the negative conductive part 301 is provided with a positioning fin 304, and the mounting plate 102 is provided with a positioning hole 103, and the positioning fin 304 is inserted into the positioning hole 103.

[0043] In the embodiment, in order to facilitate the installation of the conductive member, the positioning fin 304 is integrally bent or formed by welding or other fixing methods on the conductive member, the mounting plate 102 is provided with the positioning hole 103, and the positioning fin 304 is inserted into the positioning hole 103 to realize the positioning of the conductive member and increase the stability of the connection between the conductive member and the mounting plate 102.

[0044] As preferred, the electrode of the battery 200 is electrically connected with a connecting part 201, and the electrode of the output end 104 is fixedly provided with a connecting end 105, and the corresponding connecting end 105 and the connecting part 201 are electrically connected through the positive conductive part 300 or the negative conductive part 301.

[0045] In the embodiment, in order to facilitate the connection of the conductive member as the conductive connecting part between the battery 200 and the output end 104, the electrode of the battery 200 is electrically connected with the connecting part 201, and the electrode of the output end 104 is fixedly provided with the connecting end 105 as the connecting part for connection.

[0046] Specifically, when the positive current guide part 300 and / or the negative current guide part 301 comprises the current guide sheet 302, the connecting sheet 305 is integrally arranged on the current guide sheet 302, the positioning notch 106 is arranged on the connecting end 105, the connecting sheet 305 passes through the positioning notch 106 and the connecting sheet 305 abuts against the positioning notch 106.

[0047] In the embodiment, in order to ensure the connection stability of the current guide sheet 302 and the output end 104, the connecting sheet 305 is integrally upwardly bent on the current guide sheet 302, the positioning notch 106 is arranged at the connecting end 105 of the output end 104, the connecting sheet 305 passes through the positioning notch 106 and abuts against the positioning notch 106, the connecting sheet 305 and the connecting end 105 are pre-connected, and then the connecting sheet 305 and the connecting end 105 are fixed by welding.

[0048] It is worth mentioning that the connection between the connecting sheet 305 and the positioning notch 106 is preferably interfered, that is, after the connecting sheet 305 abuts against the inner side wall of the positioning notch 106, the connecting sheet 305 tightly abuts against the inner side wall of the positioning notch 106 under the elastic force.

[0049] Further preferably, the end of the connecting part 201 also passes through the positioning notch 106 after being bent, and the connecting part 201 does not contact the inner side wall of the positioning notch 106, and the end of the connecting part 201 abuts against the connecting sheet 305.

[0050] In the embodiment, in order to facilitate the electrical connection between the battery 200 and the current guide sheet 302, the end of the connecting part 201 is also upwardly bent, the connecting part 201 is located below the mounting plate 102, the end of the connecting part 201 passes through the mounting plate 102 and the positioning notch 106 in sequence and then abuts against the connecting sheet 305, thereby realizing the pre-connection between the connecting sheet 305 and the connecting part 201.

[0051] It is worth mentioning that one of the connecting sheet 305 and the end of the connecting part 201 is provided with the welding through slot 306, and the other one closes one end of the welding through slot 306, and the connecting sheet 305 and the end of the connecting part 201 are fixed by welding.

[0052] In the embodiment, after the pre-connection between the connecting sheet 305 and the connecting part 201, the connecting sheet 305 and the connecting part 201 are fixed by welding, the connection is strengthened, and the welding through slot 306 can increase the welding area between the connecting sheet 305 and the end of the connecting part 201, thereby ensuring the connection stability between the two.

[0053] It is worth mentioning that, preferably, an opening is arranged at the upper end of the welding channel 306 to facilitate the welding operation; and the cross-sectional shape of the connecting end 105 is arc-shaped, and the current guide strip 303 can be directly placed on the connecting end 105 for welding and fixing, and after the connecting piece 305 extends out through the positioning gap 106, an included angle is formed between the connecting end 105 and the connecting piece 305, which facilitates subsequent welding.

[0054] Further preferably, a voltage detection module is arranged on the positive electrode current guide part 300 and / or the negative electrode current guide part 301, and the voltage detection module is connected with the control module.

[0055] In the embodiment, the voltage detection module is also arranged, and the voltage detection module is electrically connected with the existing control module in the battery box to measure the voltage difference between the two ends of the current guide part. When an excessive current is detected, the protection mechanism is triggered to cut off the power supply: and the control module can also record the current values and other related parameters before and after the failure, facilitating subsequent analysis.

[0056] An electric power tool comprises the battery pack of the electric power tool.

[0057] It should be noted that the description of "first", "second", "one" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0059] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A battery pack of a power tool, characterized by, The utility model relates to a battery pack of electric tool, including: A box body is arranged with a mounting cavity; A battery is arranged in the mounting cavity, and an output end is arranged on the box body and electrically connected with the battery; A flow guide piece includes a positive electrode flow guide part and a negative electrode flow guide part, the positive electrode flow guide part is electrically connected with the positive electrode of the battery and the positive electrode of the output end, the negative electrode flow guide part is electrically connected with the negative electrode of the battery and the negative electrode of the output end, the positive electrode flow guide part includes one of flow guide piece or flow guide strip, the negative electrode flow guide part includes one of flow guide piece or flow guide strip; the flow guide piece is used to reduce the internal resistance of the current loop, reduce the loop heating, improve the charge / discharge efficiency of the battery pack.

2. The battery pack of claim 1, wherein, The mounting cavity is arranged with a mounting plate, the output end and the flow guide piece are mounted on the mounting plate, and the mounting plate is used to fix the positive electrode flow guide part and / or the negative electrode flow guide part.

3. The battery pack of claim 1, wherein, The positive electrode flow guide part and / or the negative electrode flow guide part are arranged with an overload protection part, and the overload protection part is used to protect the flow guide piece from overload.

4. The battery pack of claim 1, wherein, The flow guide piece is electrically connected with a current sampling module, which is used to sample the current of the flow guide piece.

5. The battery pack of claim 2, wherein, The positive electrode flow guide part and / or the negative electrode flow guide part are arranged with a positioning piece, and the mounting plate is arranged with a positioning hole, and the positioning piece is inserted into the positioning hole.

6. The battery pack of claim 1, wherein, The electrode of the battery is electrically connected with a connecting part, and the electrode of the output end is fixedly arranged with a connecting end, and the connecting end and the connecting part are electrically connected through the positive electrode flow guide part or the negative electrode flow guide part.

7. The battery pack of claim 6, wherein, When the positive electrode flow guide part and / or the negative electrode flow guide part include a flow guide piece, the flow guide piece is integrally arranged with a connecting piece, the connecting end is arranged with a positioning notch, the connecting piece passes through the positioning notch, and the connecting piece abuts against the inner side wall of the positioning notch.

8. The battery pack of claim 7, wherein, The end of the connecting part is bent and also passes through the positioning notch, and the connecting part does not contact the inner side wall of the positioning notch, and the end of the connecting part abuts against the connecting piece.

9. The battery pack of claim 1, wherein, The positive electrode flow guide part and / or the negative electrode flow guide part are arranged with a voltage detection module, and the voltage detection module is used to be connected with a control module.

10. An electric power tool characterized by comprising: The utility model relates to a battery pack of electric tool, including: As claimed in any one of claims 1-9.

Images