Electric tool combination

Abstract

The present invention discloses an electric tool combination, including a first device and a second device, wherein the first device includes a male terminal, and the second device includes a female terminal, wherein the male terminal includes a first flat plate portion and a second flat plate portion arranged at intervals; the female terminal includes a first elastic plate portion and a second elastic plate portion arranged at intervals; when the male terminal and the female terminal are butted, the first flat plate portion contacts the first elastic plate portion, and the second flat plate portion contacts the second elastic plate portion. By providing a female terminal having a first elastic plate portion and a second elastic plate portion and a male terminal having a first flat plate portion and a second flat plate portion, the contact area when the male terminal and the female terminal are butted can be increased, the current flowing through the contact portion can be reduced, and the contact stability of the male terminal and the female terminal can be improved, and the problem of poor contact and excessive temperature rise of the contact portion of the male terminal and the female terminal under high current conditions can be solved.

Description

Technical Field

[0001] The present invention relates to the field of electric tools, and in particular to an electric tool combination. Background Art

[0002] As the power demand of power tools increases, the output current demand of battery packs as the energy source of DC power tools is also increasing. Under high current conditions, if the contact resistance of the terminal structure that realizes the electrical connection between the battery pack and the power tool is too large or the contact is poor, it will not only affect the user experience, but also cause the temperature rise of the contact part between the battery pack and the power tool to be too high, damage the battery pack shell and the power tool shell, and also cause electrical corrosion of the connection terminals. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, an object of the present invention is to provide an electric tool combination that can solve the problems of poor contact and excessive temperature rise when the connecting terminals of the electric tool combination are in contact under high current conditions.

[0004] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solution: an electric tool combination, including a first device and a second device, the first device including a male terminal, the second device including a female terminal, characterized in that: the male terminal includes a first flat plate portion and a second flat plate portion arranged at intervals; the female terminal includes a first elastic plate portion and a second elastic plate portion arranged at intervals; when the male terminal and the female terminal are docked, the first flat plate portion contacts the first elastic plate portion, and the second flat plate portion contacts the second elastic plate portion.

[0005] Further, the first flat plate portion and the second flat plate portion of the male terminal are connected to each other; and the first elastic plate portion and the second elastic plate portion of the female terminal are connected to each other.

[0006] Further, the female terminal comprises a support plate, the first elastic plate portion and the second elastic plate portion are adjacently arranged on the left and right sides of the support plate, and the support plate is used to support the first elastic plate portion and the second elastic plate portion.

[0007] Further, the supporting plate includes a first supporting portion, a second supporting portion, a third supporting portion, a fourth supporting portion and a first connecting portion, a second connecting portion, and a third connecting portion; the first elastic plate portion includes a left elastic plate portion and a right elastic plate portion, the left elastic plate portion of the first elastic plate portion is horizontally supported on the first supporting portion, and the right elastic plate portion of the first elastic plate portion is horizontally supported on the second supporting portion; the second elastic plate portion includes a left elastic plate portion and a right elastic plate portion, the left elastic plate portion of the second elastic plate portion is horizontally supported on the third supporting portion, and the right elastic plate portion of the second elastic plate portion is horizontally supported on the fourth supporting portion; the first connecting portion connects the first supporting portion and the second supporting portion, the second connecting portion connects the second supporting portion and the third supporting portion, and the third connecting portion connects the third supporting portion and the fourth supporting portion.

[0008] Furthermore, the first connecting part connects the upper parts of the first supporting part and the second supporting part, the second connecting part connects the lower parts of the second supporting part and the third supporting part, the third connecting part connects the upper parts of the third supporting part and the fourth supporting part, and the lower parts of the first supporting part and the fourth supporting part are provided with fixing feet for fixing the supporting plate to another supporting plate.

[0009] Further, male terminals and female terminals are provided for power terminals.

[0010] Further, the first device is an electric tool, and the second device is a battery pack.

[0011] Further, the first device is a battery pack, and the second device is an electric tool.

[0012] Further, the first device is a charger, and the second device is a battery pack.

[0013] Further, the first device is a battery pack, and the second device is a charger.

[0014] Another electric tool combination includes a first device and a second device, the first device includes a male terminal, and the second device includes a female terminal, characterized in that: the male terminal includes a first flat plate portion and a second flat plate portion; the female terminal includes a first pair of elastic plate portions and a second pair of elastic plate portions; when the male terminal and the female terminal are connected, the first flat plate portion is inserted between the first pair of elastic plate portions to contact the first pair of elastic plate portions, and the second flat plate portion is inserted between the second pair of elastic plate portions to contact the second pair of elastic plate portions.

[0015] The benefit of the present invention lies in that by providing a female terminal having a first elastic plate portion and a second elastic plate portion and a male terminal having a first flat plate portion and a second flat plate portion, the contact area when the male terminal and the female terminal are docked can be increased, the current flowing through the contact portion can be reduced, and the contact stability of the male terminal and the female terminal can be improved. This can solve the problems of poor contact and excessive temperature rise at the contact portion of the male terminal and the female terminal under high current conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a combination of power tools;

[0017] Figure 2-4 It is a schematic diagram of the connection between the male terminal and the female terminal in three directions;

[0018] Figure 5 It is a stereogram of power tools;

[0019] Figure 6 This is a three-dimensional diagram of the battery pack. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figure 1 The electric tool combination includes a first device 100 and a second device 200, and the first device 100 and the second device 200 can be used in conjunction with each other. In this embodiment, the first device 100 is an electric tool, and the second device 200 is a battery pack. It can be understood that the first device 100 can be a battery pack, and the second device 200 can be an electric tool. As another option, the first device 100 is a charger, and the second device 200 is a battery pack, or the first device 100 is a battery pack, and the second device 200 is a charger.

[0022] Reference Figures 2 to 4 The first device 100 has a male terminal 10 , and the second device 200 has a female terminal 20 . When the second device 200 is engaged with the first device 100 , the female terminal 20 is in contact with and connected to the male terminal 10 to provide an electrical connection between the first device 100 and the second device 200 .

[0023] Usually, the female terminal 20 includes an elastic plate portion, and the male terminal 10 includes a flat plate portion. The flat plate portion of the male terminal 10 can be inserted between the elastic plate portions of the female terminal 20, thereby achieving contact connection between the female terminal 20 and the male terminal 10. Under high current conditions, when the female terminal 20 contacts the male terminal 10, the current flowing through the contact portion is too large, which will cause the temperature rise of the contact portion to be too high. To this end, multiple sets of mutually cooperating elastic plates and flat plate portions can be added to increase the contact area between the male terminal 10 and the female terminal 20, thereby reducing the current flowing through the contact portion.

[0024] Reference Figures 2 to 4 The female terminal 20 includes a first elastic plate portion 21 and a second elastic plate portion 22 , and the male terminal 10 includes a first flat plate portion 11 and a second flat plate portion 12 .

[0025] The first elastic plate portion 21 of the female terminal 20 includes a left elastic plate portion 211 and a right elastic plate portion 212, which are arranged at the same height and parallel to each other, that is, the left elastic plate portion 211 and the right elastic plate portion 212 are symmetrical with respect to the insertion center line of the first flat plate portion 11 of the male terminal 10, that is, the left elastic plate portion 211 and the right elastic plate portion 212 of the first elastic plate portion 21 are symmetrical with respect to the first insertion center line x1.

[0026] The second elastic plate portion 22 of the female terminal 20 includes a left elastic plate portion 221 and a right elastic plate portion 222, which are arranged at the same height and parallel to each other, that is, the left elastic plate portion 221 and the right elastic plate portion 222 are symmetrical with respect to the insertion center line 12 of the second flat plate portion 10 of the male terminal 10, that is, the left elastic plate portion 221 and the right elastic plate portion 222 of the second elastic plate portion 22 are symmetrical with respect to the second insertion center line x2.

[0027] The left elastic plate portion 211 and the right elastic plate portion 212 of the first elastic plate portion 21 and the left elastic plate portion 221 and the right elastic plate portion 222 of the second elastic plate portion 22 can be bent into a shape in which the first flat plate portion 11 and the second flat plate portion 12 of the male terminal 10 are inserted between the elastic halves on the left and right sides to generate an elastic force that squeezes the flat plate portions. For example, the left elastic plate portions 211, 221 and the right elastic plate portions 221, 222 are bent into a tulip shape or a plum blossom shape.

[0028] The first elastic plate portion 21 and the second elastic plate portion 22 of the female terminal are supported by the support plate 23 and are adjacently arranged on the left and right sides of the support plate, and the first elastic plate portion 21 and the second elastic plate portion 22 are connected to each other. The support plate 23 is configured to be in a shape that is conducive to supporting and connecting the first elastic plate portion 21 and the second elastic plate portion 22, while meeting the size requirements of the battery pack.

[0029] In one embodiment, the support plate 23 is configured to resemble an M shape or a concave shape.

[0030] Specifically, the support plate 23 includes a first support portion 231, a second support portion 233, a third support portion 235, a fourth support portion 237, and a first connection portion 232, a second connection portion 234, and a third connection portion 236. Each support portion is used to support one elastic plate portion, and each connection portion is used to connect two support portions.

[0031] Specifically, the first supporting portion 231 supports the left elastic plate portion 211 of the first elastic plate portion 21, the second supporting portion 233 supports the right elastic plate portion 212 of the first elastic plate portion 21, the third supporting portion 235 supports the left elastic plate portion 221 of the second elastic plate portion 22, and the fourth supporting portion 237 supports the right elastic plate portion 222 of the second elastic plate portion 22. The first connecting portion 232 connects the first supporting portion 231 and the second supporting portion 233, that is, connects the left elastic plate portion 211 and the right elastic plate portion 212 of the first elastic plate portion 21, the second connecting portion 234 is used to connect the second supporting portion 233 and the third supporting portion 235, that is, connects the right elastic plate portion 212 of the first elastic plate portion 21 and the left elastic plate portion 221 of the second elastic plate portion 22, and the third connecting portion 236 connects the third supporting portion 235 and the fourth supporting portion 237, that is, connects the left elastic plate portion 221 and the right elastic plate portion 222 of the second elastic plate portion 22.

[0032] The first support portion 231 and the second support portion 233 are symmetrically arranged on the left and right sides of the first insertion center line x1, and the third support portion 235 and the fourth support portion 237 are symmetrically arranged on the left and right sides of the second insertion center line x2. The first support portion 231, the second support portion 233, the third support portion 235, and the fourth support portion 237 are parallel to each other in the vertical direction.

[0033] The first connecting portion 232 connects the upper portion of the first supporting portion 231 and the second supporting portion 233, the second connecting portion 234 connects the lower portion of the second supporting portion 233 and the third supporting portion 235, and the third connecting portion 236 connects the upper portion of the third supporting portion 235 and the fourth supporting portion 237. Fixing feet are provided at the lower portion of the first supporting portion 231 and the fourth supporting portion 237, so that the supporting portions and the supporting plates 23 connected to each other can be fixed to other supporting plates 24, such as the circuit board of the battery pack.

[0034] Of course, other structures of the support plate 23 that are conducive to supporting and connecting the elastic plate part and that can be easily thought of by those skilled in the art all fall within the protection scope of the present invention.

[0035] The four supporting parts and three connecting parts of the supporting plate can be made of the same conductive material to form an integral structure, or the four supporting parts and the three connecting parts can be welded together by welding. In addition, the first elastic plate part 21, the second elastic plate part 22 and the supporting plate 23 can also be made of the same conductive material to form an integral structure, or the first elastic plate part 21 and the second elastic plate part 22 can be welded to the supporting plate 23 by welding. The four supporting parts are parallel to each other and can be distributed in a straight line along the direction perpendicular to the insertion center of the flat plate part of the male terminal 10, and the three connecting parts are parallel to each other and perpendicular to the above four supporting parts.

[0036] The male terminal 10 includes a first flat plate portion 11 and a second flat plate portion 12, and the first flat plate portion and the second flat plate portion are connected to each other through a connecting portion 13. The first flat plate portion 11 of the male terminal 10 can be inserted between the left elastic plate portion 211 and the right elastic plate portion 212 of the first elastic plate portion 21 along the first insertion center line x1, and the second flat plate portion 12 can be inserted between the left elastic plate portion 221 and the right elastic plate portion 222 of the second elastic plate portion 22 along the second insertion center x2. Under the elastic force of the left elastic plate portion and the right elastic plate portion, the first flat plate portion 11 and the first elastic plate portion 21 are in contact and connection, and the second flat plate portion 12 and the second elastic plate portion 22 are in contact and connection.

[0037] In one implementation, the connection plate 13 connects the rear surface of the first flat plate portion 11 and the rear surface of the second flat plate portion 12 , where the rear surface refers to the surface of the first flat plate portion 11 and the second flat plate portion 12 that is away from the female terminal in the insertion direction.

[0038] In another embodiment, the connecting plate 13 connects the upper surface of the first flat plate portion 11 and the upper surface or lower surface of the second flat plate portion 12 , where the upper surface and lower surface here refer to the upper surface and lower surface of the first flat plate portion 11 and the second flat plate in the vertical direction.

[0039] When each flat plate portion contacts each pair of elastic plate portions, the temperature of the contact portion will increase due to the action of the current. Therefore, a plurality of small holes 14 may be provided in the non-contact portion between each flat plate portion and the elastic plate portion for heat dissipation.

[0040] In this way, by providing a female terminal 20 having a first elastic plate portion 21 and a second elastic plate portion 22 and a male terminal 10 having a first flat plate portion 11 and a second flat plate portion 12, the contact area when the male terminal 10 and the female terminal 20 are docked can be increased, the current flowing through the contact portion can be reduced, and the contact stability of the male terminal 10 and the female terminal 20 can be improved, which can solve the problem of poor contact and excessive temperature rise of the contact portion of the male terminal 10 and the female terminal 20 under high current conditions.

[0041] The female terminal 20 is arranged in the battery pack, and the male terminal 10 is arranged in the power tool. Of course, the female terminal 20 can also be arranged in the power tool, and the male terminal 10 is arranged in the battery pack. In addition, the female terminal 20 can be arranged in the battery pack, and the male terminal 10 is arranged in the charger. Of course, the female terminal 20 can also be arranged in the charger, and the male terminal 10 can be arranged in the battery pack.

[0042] The application of the male terminal 10 and the female terminal 20 in a battery pack and an electric tool will be described in detail below.

[0043] Reference Figure 5 and Figure 6The electric tool comprises a body having a receiving portion for at least partially receiving a battery pack, wherein the battery pack can be detachably inserted into the receiving portion of the electric tool.

[0044] The battery pack includes a battery group of several battery cells, a housing for accommodating the several battery cells, a circuit board, and a female power terminal group for electrically connecting to a male power terminal group of an electric tool.

[0045] The negative power terminal group is electrically connected to the battery pack, and the positive power terminal group is electrically connected to the power components, electronic components and circuits of the power tool. When the battery pack is inserted into the receiving portion of the power tool, the negative power terminal group of the battery pack is electrically connected to the positive power terminal group of the power tool.

[0046] The negative power terminal group of the battery pack includes a positive negative terminal 61 and a negative negative terminal 62, the positive negative terminal 61 is electrically connected to the positive electrode of the battery pack, and the negative negative terminal 62 is electrically connected to the negative electrode of the battery pack. The positive negative terminal 61 and the negative negative terminal 62 each include two pairs of elastic plate portions, each pair of elastic plate portions includes a left elastic plate portion and a right elastic plate portion, the left elastic plate portion and the right elastic plate portion are arranged in parallel at the same height, and the left elastic plate portion and the right elastic plate portion are symmetrical with respect to the insertion center line when the flat plate portion of the male terminal is inserted.

[0047] The negative power terminal group of the battery pack is specifically described below by taking the positive negative terminal 61 of the battery pack as an example.

[0048] The positive negative terminal 61 of the battery pack includes a first elastic plate portion 611, a second elastic plate portion 612 and a support plate 613. The first elastic plate portion 611 and the second elastic plate portion 612 are adjacently arranged on the left and right sides of the support plate 613. The first elastic plate portion 611, the second elastic plate portion 612 and the support plate 613 are an integral structure.

[0049] Each of the first elastic plate portion 611 and the second elastic plate portion 612 includes a left elastic plate portion and a right elastic plate portion, and the left elastic plate portion and the right elastic plate portion are bent into a tulip shape so that the first flat plate portion 511 and the second flat plate portion 512 of the positive positive terminal 51 of the positive power terminal of the power tool are clamped and contacted by the first elastic plate portion 611 and the second elastic plate portion 612 respectively, so that the positive negative terminal 61 of the battery pack is in contact and connected with the positive positive terminal 51 of the power tool.

[0050] The support plate 613 is configured to be in a shape similar to a Chinese character "concave". Specifically, the support plate 613 includes a first support portion, a second support portion, a third support portion, a fourth support portion, and a first connecting portion, a second connecting portion, and a third connecting portion. The structure of the support plate 613 is the same as that of the support plate 23 described above, and will not be described again here.

[0051] The structure of the negative electrode terminal 62 of the battery pack is the same as that of the positive electrode terminal 61 of the battery pack, and will not be described again here.

[0052] The male power terminal group is disposed in the receiving portion of the electric tool, and includes a positive male terminal 51 and a negative male terminal 52 of the electric tool. The positive male terminal 51 and the negative male terminal 52 of the electric tool each include a first flat plate portion and a second flat plate portion.

[0053] The following specifically describes the positive power terminal group of the electric tool by taking the positive positive terminal 51 of the electric tool as an example.

[0054] The positive positive terminal 51 of the electric tool includes a first flat plate portion 511 and a second flat plate portion 512 electrically connected to each other. The first flat plate portion 511 can be inserted between the left elastic plate portion and the right elastic plate portion of the first elastic plate portion 611 of the positive negative terminal 61 of the battery pack, and the second flat plate portion 512 can be inserted between the left elastic plate portion and the right elastic plate portion of the second elastic plate portion 612 of the positive negative terminal 61 of the battery pack.

[0055] The first flat plate portion 511 and the second flat plate portion 512 of the positive male terminal 51 of the electric tool are connected to each other via a connecting plate. The positive male terminal 51 of the electric tool has the same structure as the male terminal 10 described above, and will not be repeated here. The negative male terminal 52 of the electric tool has the same structure as the positive male terminal 51 of the electric tool, and will not be repeated here.

[0056] A plurality of small holes may be provided at the non-contact portion of each flat plate portion of the male power terminal group of the electric tool and each elastic plate portion of the female power terminal group of the battery pack for heat dissipation.

[0057] When using the electric tool, the battery pack is inserted into the accommodating portion of the electric tool. At this time, the positive male terminal 51 and the negative male terminal 52 of the electric tool are respectively in contact and connected with the positive female terminal 61 and the negative female terminal 62 of the battery pack along the insertion direction. Specifically, the first flat plate portion 511 and the second flat plate portion 512 of the positive male terminal 51 of the electric tool are respectively inserted between the left elastic plate portion and the right elastic plate portion of the first elastic plate portion 611 of the positive female terminal 61 of the battery pack and between the left elastic plate portion and the right elastic plate portion of the second elastic plate portion 612, so that the positive male terminal 51 of the electric tool is in contact and connected with the positive female terminal 61 of the battery pack, and the negative male terminal 52 of the electric tool is in contact and connected with the negative female terminal 62 of the battery pack. As a result, the positive power terminal of the electric tool and the negative power terminal of the battery pack are electrically connected.

[0058] It is easy for a person skilled in the art to think that in order to increase the contact area between the male terminal 10 and the female terminal 20, the female terminal 20 can be provided with multiple pairs of elastic plate portions in parallel and transversely on the support plate 23, and the number of the flat plate portions of the male terminal 10 is the same as the number of the elastic plate portions of the female terminal 20. Alternatively, multiple pairs of elastic plate portions can be provided in the longitudinal direction of the first elastic plate portion 21 and the second elastic plate portion 22, and the number of the flat plate portions of the male terminal 10 is still two. The number of pairs of the elastic plate portions of the female terminal 20 is determined according to the specific current working conditions. In principle, the larger the current, the more pairs of the elastic plate portions, so as to increase the contact area between the male terminal 10 and the female terminal 20, but the overall size and cost of the battery pack need to be considered for optimal selection.

[0059] In this way, by providing mutually matching female terminals 20 having multiple pairs of elastic plate portions and male terminals 10 having multiple flat plate portions, the contact area when the male terminal 10 and the female terminal 20 are docked can be increased, the current flowing through the contact portion can be reduced, and the contact stability of the male terminal 10 and the female terminal 20 can be improved. This can solve the problems of poor contact and excessive temperature rise of the contact portions of the male terminal 10 and the female terminal 20 under high current conditions.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. An electric tool assembly, comprising a first device and a second device, wherein the first device comprises a male terminal and the second device comprises a female terminal, wherein: One of the male terminals includes a first flat plate portion and a second flat plate portion that are spaced apart; one of the female terminals includes a first elastic plate portion and a second elastic plate portion that are spaced apart; when one of the male terminals and one of the female terminals are butted against each other, the first flat plate portion is inserted between the first elastic plate portions to contact the first elastic plate portions, and the second flat plate portion is inserted between the second elastic plate portions to contact the second elastic plate portions; The first flat plate portion and the second flat plate portion of the male terminal are electrically connected to each other; the first elastic plate portion and the second elastic plate portion of the female terminal are electrically connected to each other; the electric tool combination is a combination of a battery pack and an electric tool or a combination of a battery pack and a charger.

2. The electric tool assembly according to claim 1, characterized in that: The female terminal includes a support plate, the first elastic plate portion and the second elastic plate portion are adjacently disposed on left and right sides of the support plate, and the support plate is used to support the first elastic plate portion and the second elastic plate portion.

3. The electric tool assembly according to claim 2, characterized in that: The support plate includes a first support portion, a second support portion, a third support portion, a fourth support portion and a first connecting portion, a second connecting portion and a third connecting portion; the first elastic plate portion includes a left elastic plate portion and a right elastic plate portion, the left elastic plate portion of the first elastic plate portion is horizontally supported on the first support portion, and the right elastic plate portion of the first elastic plate portion is horizontally supported on the second support portion; the second elastic plate portion includes a left elastic plate portion and a right elastic plate portion, the left elastic plate portion of the second elastic plate portion is horizontally supported on the third support portion, and the right elastic plate portion of the second elastic plate portion is horizontally supported on the fourth support portion; the first connecting portion connects the first supporting portion and the second supporting portion, the second connecting portion connects the second supporting portion and the third supporting portion, and the third connecting portion connects the third supporting portion and the fourth supporting portion.

4. The electric tool assembly according to claim 3, characterized in that: The first connecting portion connects the upper portions of the first supporting portion and the second supporting portion, the second connecting portion connects the lower portions of the second supporting portion and the third supporting portion, the third connecting portion connects the upper portions of the third supporting portion and the fourth supporting portion, and the lower portions of the first supporting portion and the fourth supporting portion are provided with fixing feet for fixing the supporting plate to another supporting plate.

5. The electric tool assembly according to any one of claims 1 to 4, characterized in that: The male terminal and the female terminal are provided for power terminals.

6. The electric tool assembly according to any one of claims 1 to 4, characterized in that: The first device is an electric tool, and the second device is a battery pack.

7. The electric tool assembly according to any one of claims 1 to 4, characterized in that: The first device is a battery pack, and the second device is a power tool.

8. The electric tool assembly according to any one of claims 1 to 4, characterized in that: The first device is a charger, and the second device is a battery pack.

9. The electric tool assembly according to any one of claims 1 to 4, characterized in that: The first device is a battery pack, and the second device is a charger.

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