CN111584789A

CN111584789A - Electric tool and system thereof

Info

Publication number: CN111584789A
Application number: CN202010557390.8A
Authority: CN
Inventors: 刘传君; 庄宪; 霍晓辉; 严安
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2020-08-25
Anticipated expiration: 2040-06-18
Also published as: CN111584789B

Abstract

The invention provides an electric tool system which comprises an electric tool and a battery pack, wherein the battery pack comprises two battery packs, and the electric tool is correspondingly provided with two negative terminals and two positive terminals. The electric tool is also provided with a linkage switch which comprises two contact pieces, a pressing plate component and a linkage component arranged in a moving way. The two contact pieces are respectively connected with a positive terminal and a negative terminal of different corresponding battery packs. The pressing plate component is provided with four conducting strips which are respectively connected with the four electrode terminals. One side of the linkage component is provided with a guide connecting piece, and the other side of the linkage component is provided with a plurality of switching pieces. When the guide connecting sheet is contacted with the two contact sheets, one positive terminal and one negative terminal corresponding to different battery packs are electrically connected; when the switching piece is contacted with the conducting piece, the two positive terminals are electrically connected, and the two negative terminals are electrically connected. The linkage switch can switch the connection state of the four electrode terminals, and further control the output voltage of the matched battery pack.

Description

Electric tool and system thereof

Technical Field

The present invention relates to an electric tool, and more particularly, to an electric tool with a linked switch.

Background

Currently, there are more and more hand-held power tools on the market, especially in the garden tool industry, such as pruners, lawnmowers, scarifiers, mowers, etc. In order to prolong the service life and improve the power of the electric tool and simultaneously consider the convenience and the general type of battery pack replacement, the electric tool usually adopts a scheme of multiple battery packs, and more commonly adopts double battery packs. When the battery pack is used, the two battery packs are required to be installed in corresponding slots of the electric tool, so that the output voltage matched with the rated working voltage of the electric tool can be provided, and the electric tool can normally work; if only one battery pack is installed, the electric tool cannot work normally.

Therefore, there is a need for an improved power tool that addresses the above-mentioned problems.

Disclosure of Invention

The invention provides an electric tool, which is provided with a linked switch capable of switching the output voltage of a battery pack.

Specifically, the invention is realized by the following technical scheme: the utility model provides an electric tool is equipped with and is used for four electrode terminal with two group battery complex of battery package, includes two positive terminals and two negative terminal, its characterized in that: the electric tool is provided with a linked switch, the linked switch comprises two contact pieces, a pressing plate assembly and a linkage assembly which is movably arranged, the two contact pieces are respectively and electrically connected with a positive terminal and a negative terminal of different corresponding battery packs, and the pressing plate assembly is provided with four conducting strips which are respectively and electrically connected with the four electrode terminals; the linkage assembly is provided with a first side surface and a second side surface which are opposite, wherein the first side surface is provided with a guide connecting piece, and the second side surface is provided with a plurality of adapter pieces; when the conducting sheets are contacted with the two contact sheets, the positive terminal and the negative terminal are electrically connected, and the adapter sheets are separated from the four conducting sheets; when the plurality of adapter plates are contacted with the four conducting plates, the two positive terminals are electrically connected, the two negative terminals are electrically connected, and the conducting plates are separated from the two contact plates. This application electric tool can change the connected mode of four electrode terminal that are connected respectively with each electrode of battery package through gang switch, and then realizes the series-parallel state of two group batteries in the control battery package.

According to an embodiment of the invention, in an initial state, the guide tabs are in contact with the two contact pieces, the linkage assembly moves to the pressing plate assembly after being pressed, so that the guide tabs are separated from the two contact pieces, the number of the adapter pieces includes four, the four adapter pieces are respectively in contact with the four conductive pieces, the two adapter pieces corresponding to the two positive terminals through the conductive pieces are electrically connected, and the two adapter pieces corresponding to the two negative terminals through the conductive pieces are electrically connected.

According to an embodiment of the present invention, the linkage assembly further includes an elastic member disposed between the linkage assembly and the pressure plate assembly, and the elastic member drives the linkage assembly to return.

According to an embodiment of the invention, the pressing plate assembly and the linkage assembly are respectively provided with a containing cavity for containing the elastic member.

According to one embodiment of the invention, the electric tool is further provided with a mounting seat, the linkage switch is mounted on the mounting seat, the mounting seat is provided with a mounting groove, the contact piece is fixed on the side wall of the mounting seat, the pressure plate component is fixed on the top of the mounting groove through a screw, and the linkage component is movably arranged in the mounting groove and located between the contact piece and the pressure plate component.

According to an embodiment of the invention, the linkage switch further comprises a micro-button, the micro-button is provided with a head part and a rod part, and the head part is pressed to drive the rod part to drive the linkage assembly.

The invention can also be realized by the following technical scheme: a power tool system, characterized by: the electric tool system comprises a first battery pack, a second battery pack and the electric tool according to any one of claims 1 to 5, wherein the electric tool comprises two slots including a first slot for accommodating the first battery pack and a second slot for accommodating the second battery pack, four electrode terminals are arranged in each slot, and the two contact pieces and the four conductive pieces of the linked switch are respectively connected with the corresponding electrode terminals in the second slot. This application electric tool system can change the connected mode of four electrode terminal that are connected respectively with each electrode of battery package through gang switch, and then realizes the series-parallel state of two group batteries in the control battery package.

According to an embodiment of the invention, the ganged switch further comprises a micro-button, the micro-button is provided with a head part and a rod part, the head part protrudes into the first slot, and the first battery pack is inserted into the first slot to drive the ganged assembly to move towards the pressure plate assembly.

According to an embodiment of the present invention, the four electrode terminals include a first positive terminal and a first negative terminal electrically connected to the same battery pack, and a second positive terminal and a second negative terminal electrically connected to another battery pack, wherein two of the contact pieces are electrically connected to the first positive terminal and the second negative terminal, respectively; the linkage assembly is further provided with two other contact pieces, the two other contact pieces are respectively connected with the first positive terminal and the second negative terminal in the first slot, and the linkage assembly is further provided with another guide connection piece connected with the two other contact pieces.

According to an embodiment of the present invention, the electric power tool is further provided with another ganged switch having the same structure as the ganged switch, two of the contact pieces and four of the conductive pieces of the another ganged switch are respectively connected to the corresponding electrode terminals in the first slot, the other two contact pieces of the another ganged switch are respectively connected to the first negative terminal and the second positive terminal in the second slot, and the another ganged switch is driven when the second battery pack is inserted into the second slot; the second positive terminal in the first slot remains connected to the first negative terminal in the second slot.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

Fig. 1 is a perspective assembly view of the power tool system of the present invention.

Fig. 2(a) to 2(c) are three operation state diagrams of two battery packs of the electric tool system of the present invention.

Fig. 3(a) and 3(b) are partial perspective views of an electric power tool according to a first embodiment of the present invention.

Fig. 4 is a schematic connection diagram of the switch of the electric power tool in the initial state in the first embodiment.

Fig. 5(a) to 5(c) are schematic connection diagrams of the switch in the first embodiment corresponding to three operating states.

Fig. 6 is a schematic connection diagram of a switch of a power tool according to a second embodiment of the present invention in an initial state.

Fig. 7 is a schematic diagram of the connection between the switch and the micro control unit in the second embodiment.

Fig. 8(a) to 8(c) are schematic connection diagrams of the switch in the second embodiment corresponding to three operating states.

Fig. 9 is a schematic connection diagram of a switch in an initial state in the third embodiment of the electric power tool of the present invention.

Fig. 10 is a partial perspective view of the electric power tool of the third embodiment.

Fig. 11(a) to 11(c) are schematic connection diagrams of the switch in the third embodiment corresponding to three operating states.

Fig. 12 is a partial perspective view of a power tool according to a fourth embodiment of the present invention.

Fig. 13 is a partially exploded perspective view of the power tool of the fourth embodiment.

Fig. 14 is an exploded perspective view of a ganged switch of the power tool of the fourth embodiment.

Fig. 15 is a wiring diagram of a contact piece of the ganged switch.

Fig. 16 is an assembly view of the linkage assembly of the ganged switch.

FIG. 17 is an assembly view of the pressure plate assembly of the ganged switch.

Fig. 18 is a plan view of a linkage assembly of the ganged switch.

Fig. 19 is another plan view of the linkage assembly of the gang switch.

FIG. 20 is a wiring diagram of the pressure plate assembly of the gang switch.

FIG. 21 is a plan view of a pressure plate assembly of the ganged switch.

Fig. 22 is a wiring schematic of the ganged switch.

Fig. 23 is a view similar to fig. 22 showing the change in position of the ganged switch when the first battery pack is inserted.

Fig. 24 is a view similar to fig. 22 showing the change of the position of the ganged switch when the first battery pack and the second battery pack are simultaneously inserted.

Fig. 25 is a partial plan view of a battery pack of a power tool according to a fifth embodiment of the present invention.

Fig. 26 is a partial plan view of the battery pack of fig. 22 in another state.

Fig. 27 is a plan view of the tandem male receptacle of fig. 22.

The reference numbers illustrate:

the electric tool 100, the first battery pack 10, the second battery pack 20, the first slot 11, the second slot 21, the first negative terminal 101, the second negative terminal 103, the first positive terminal 102, the second positive terminal 104, the first negative terminal 105, the second negative terminal 107, the first positive terminal 106, the second positive terminal 108, the switch terminal 12, the switch terminal 22, the switch terminal 13, the first male plug 14, the second male plug 24, the mounting groove 15, the mounting groove 151, the screw post 16, the gang switch 3, the contact piece 31, the first contact 311, the gang assembly 32, the insulating substrate 321, the guide piece 322, the second contact 323, the adapter piece 324, the fourth contact 325, the elastic piece 33, the pressing plate assembly 34, the insulating plate 341, the conductive piece 342, the third contact 343, the male tab button 35, the screw 36, the parallel tab seat 50, the electrode 41, the parallel terminal 51, the series male socket 60, the insulating post 61, the conductive piece 343, the conductive piece 342, the micro-switch button 35, the micro-, And a series terminal 62.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of devices, systems, apparatus, and methods consistent with certain aspects of the invention, as detailed in the following claims. To avoid obscuring the present invention with unnecessary detail, only the structures and/or process steps that are germane to aspects of the present invention are shown in the drawings, while other details that are not germane to the present invention are omitted.

The present invention provides a portable power tool 100 that can be powered for wireless operation using an electrical energy storage device. The electric power tool 100 may be a pruner, a chain saw, a blower, a cleaner, a mower, a ripper, or the like, and in the present embodiment, an electric drill is described as an example.

In this embodiment, the power tool 100 has a rated voltage of 48V, and can be coupled with two battery packs. Each battery pack comprises at least two battery packs with the same rated voltage, each battery pack can comprise 1 or more battery units, and in the embodiment, the output voltage of each battery pack is 24V. Referring to fig. 1, two slots are respectively disposed on the left and right sides of the bottom of the electric tool 100, each slot is used for receiving and matching one of the battery packs, the structures of the two battery packs are completely the same, and the structures of the two slots are also completely the same.

As shown in fig. 2(a) to 2(c), the electric tool 100 of the present invention has three operation states, the first is that only the first battery pack 10 is disposed in the first slot 11; the second is that only the second battery pack 20 is disposed in the second slot 12, and the third is that the first battery pack 10 and the second battery pack 20 are disposed in the first slot 11 and the second slot 12, respectively. The first and second operating states can be regarded as the same operating state, that is, only one of the slots is provided with a battery pack, which can be defined as a single-pack operating state, and the third operating state can be defined as a double-pack operating state, and both the two operating states can achieve a fixed voltage output of 48V, that is, no matter one

battery pack

10, 20 or two battery packs 10, 20 are provided, the electric tool 100 can obtain a rated operating voltage of 48V and can operate normally. Each battery pack of each

battery pack

10, 20 has a pair of positive and negative electrodes, and specifically includes a first negative electrode, a second negative electrode, a first positive electrode, and a second positive electrode. As shown in fig. 3(a) and 3(b), each slot has a set of electrode terminals, and the electrode terminals in the first slot include a first negative terminal 101, a second negative terminal 103, a first positive terminal 102, and a second positive terminal 104, which are respectively connected to the first negative electrode, the second negative electrode, the first positive electrode, and the second positive electrode of the first battery pack 10. The electrode terminals in the second slot are respectively a first negative terminal 105, a second negative terminal 107, a first positive terminal 106 and a second positive terminal 108, and are correspondingly connected with the first negative electrode, the second negative electrode, the first positive electrode and the second positive electrode of the second battery pack 20. The connection method between the two battery packs inside the battery packs 10, 20 inserted into the

slots

11, 12 can be adjusted by providing the eight

electrode terminals

101, 102, 103, 104, 105, 106, 107, 108 with different connection methods.

Fig. 2(a) to 2(c) are schematic connection diagrams of the electrode terminals, in which "1-" and "1 +" on the left side in the drawing represent the first negative terminal 101 and the first positive terminal 102 corresponding to the first negative electrode and the first positive electrode of the first battery pack 10, and "2-" and "2 +" represent the second negative terminal 103 and the second positive terminal 104 corresponding to the second negative electrode and the second positive electrode of the first battery pack 10. The "1-" and "1 +" on the right side in the drawing represent the first negative terminal 105 and the first positive terminal 106 corresponding to the first negative electrode and the first positive electrode of the second battery pack 20, and the "2-" and "2 +" represent the second negative terminal 107 and the second positive terminal 108 corresponding to the second negative electrode and the second positive electrode of the second battery pack 20. Wherein the first negative terminal 101 represented by "1" on the left side is a negative output terminal, and the second positive terminal 108 represented by "2 +" on the right side is a positive output terminal, and the following related drawings are defined by this definition, if different, and will be described in further detail.

Fig. 2(a) corresponds to the first operating state, in which the electric power tool 100 is provided with only the first battery pack 10, and the left side in the drawing represents the "2-" of the second negative terminal 103 and the "1 +" of the first positive terminal 102, so that the second negative electrode and the first positive electrode in the first battery pack 10 can be connected, the two battery packs of the first battery pack 10 can be connected in series, and the output voltage of the first battery pack 10 is 48V; the right side in the drawing represents "1-" of the first negative terminal 105, "1 +" of the first positive terminal 106, "2-" of the second negative terminal 107, and "2 +" of the second positive terminal 108, i.e., all four electrodes for electrical connection with the second battery pack 20. And, 2+ representing the second positive terminal 104 on the left side is connected to 2+ representing the second positive terminal 108 (total positive) on the right side, so that the first battery pack 10 is directly output to the outside, and the output voltage is 48V.

Fig. 2(b) corresponds to the second operating state, in which the electric power tool 100 is provided with only the second battery pack 20, the right side in the drawing represents the "2-" of the second negative terminal 107 and the "1 +" of the first positive terminal 106, the first positive electrode and the second negative electrode in the second battery pack 20 are connected, the two battery packs forming the second battery pack 20 are connected in series, and the output voltage of the second battery pack 20 is 48V; in the drawing, the left side represents "1-" of the first negative terminal 101, "1 +" of the first positive terminal 102, "2-" of the second negative terminal 103, and "2 +" of the second positive terminal 104, that is, all four electrodes for electrical connection with the first battery pack 10 are electrically connected, and the right side represents "1-" of the first negative terminal 105 and the left side represents "1-" (total negative) connection of the first negative terminal 101, and the second battery pack 20 directly outputs to the outside, and the output voltage is 48V.

Fig. 2(c) shows a third operating state, in which the electric power tool 100 is provided with the first battery pack 10 and the second battery pack 20, the left side represents that "1-" of the first negative terminal 101 is connected to "2-" of the second negative terminal 103, and "1 +" of the first positive terminal 102 is connected to "2 +" of the second positive terminal 104, so that the first negative electrode and the second negative electrode of the first battery pack 10 are connected to each other, and the first positive electrode and the second positive electrode are connected to each other, so that the two battery packs of the first battery pack 10 are connected in parallel, and the output voltage of the first battery pack 10 is 24V. The right side represents that "1-" of the first negative terminal 105 is connected to "2-" of the second negative terminal 107, and "1 +" of the first positive terminal 106 is connected to "2 +" of the second positive terminal 108, so that the first negative electrode and the second negative electrode of the second battery pack 20 can be connected, the first positive electrode is connected to the second positive electrode, the two battery packs of the second battery pack 20 are in a parallel connection state, and the output voltage of the second battery pack 20 is 24V. In addition, the left side represents "1 +" of the first positive terminal 102 and "2 +" of the second positive terminal 104 and the right side represents connection of the first negative terminal 105 "1-" and "2-" of the second negative terminal 107, that is, the positive electrode of the first battery pack 10 and the negative electrode of the second battery pack 20 are connected, so that the first battery pack 10 and the second battery pack 20 are in a serial connection state, an operating state in which two battery packs inside a

single battery pack

10, 20 are connected in parallel and the two battery packs 10, 20 are connected in series is formed, and the output voltage is 48V.

It can be seen that, in the above three operating states, the first battery pack 10 and the second battery pack 20 can provide 48V when used alone, and also provide 48V when used together, so as to ensure that the electric power tool 100 operates normally at the rated operating voltage of 48V. Specifically, when the electric tool 100 works with two battery packs, two battery packs in each battery pack are connected in parallel to provide low-voltage output, and the two battery packs are connected in series; when the power tool 100 works with a single battery pack, two battery packs in the single battery pack are connected in series to provide high-voltage output, and the power tool system can adjust the connection mode of the two battery packs in the battery pack according to the condition that the power tool 100 uses the battery pack.

In the present embodiment, the first battery pack 10 and the second battery pack 20 are dual-pack, and output 48V when used alone, and output 24V when used together and are connected in series with each other; as a variation, the first battery pack 10 and the second battery pack 20 may use a single-pressure pack, which outputs 48V when used alone, and outputs 48V when used together and are connected in parallel to each other.

The invention also provides a plurality of switches which are arranged between the electrode terminals, and the adjustment and control of the connection mode of the two battery packs in the battery pack can be realized by controlling the on-off of the switches so as to realize the switching and control mode of the three working states. The present invention provides a number of embodiments of switch arrangements, which will be described separately below.

Example one

Referring to the left side of fig. 4, the power tool 100 is provided with a first group of control switches controlling the first battery pack 10, including a first switch BS1 disposed between "1-" representing the first negative terminal 101 and "2-" representing the second negative terminal 103, a second switch BS2 disposed between "1 +" representing the first positive terminal 102 and "2 +" representing the second positive terminal 104, two third switches AS3 and a third switch BS3 disposed between "2-" representing the second negative terminal 103 and "1 +" representing the first positive terminal 102.

Referring to the left side of fig. 4, the electric power tool 100 is provided with a second group of control switches controlling the second battery pack 20, including a fourth switch AS1 provided between "1-" representing the first negative terminal 105 and "2-" representing the second negative terminal 107, a fifth switch AS2 provided between "1 +" representing the first positive terminal 106 and "2 +" representing the second positive terminal 108, and two sixth switches AS4, BS4 provided between "2-" representing the second negative terminal 103 and "1 +" representing the first positive terminal 102.

The first group of control switches is used to adjust the electrode connection mode of the first battery pack 10, and the second group of control switches is used to adjust the electrode connection mode of the second battery pack 20. Fig. 4 illustrates the initial states of the switches, in which the first switch BS1 and the second switch BS2 are normally open switches, i.e., are initially in an open state, and the third switches AS3 and BS3 are normally closed switches, i.e., are initially in a conductive state. The fourth switch AS1 and the fifth switch AS2 are normally open switches, and the sixth switch AS4 and BS4 are normally closed switches. A direct connection is made between "2 +" representing the second positive terminal 104 of the first battery pack 10 and "1-" representing the first positive terminal 105 of the second battery pack 20. That is, in the case where the respective switches do not switch the states, the first battery pack 10 and the second battery pack 20 may be connected in series, and the two battery packs in each of the battery packs 10, 20 may be connected in series.

The normally closed switch is an initial state in which the two contact portions are in a contact state to electrically connect the electrodes of the two contact portions, and the electrical connection state of the two contact portions can be changed by an external action to switch the two contact portions from the contact state to the disconnection state, for example, a normally closed switch. The normally open switch is a normally open switch, in which two contact portions are in an open state to realize that electrodes electrically connected with the two contact portions are in an open state, and the electrical connection state of the two contact portions can be changed by the action of a foreign object, so that the two contact portions are switched from the open state to the connection state. Of course, the normally open switch is not limited to be a normally open terminal, and the normally closed switch is not limited to be a normally closed terminal, and embodiments capable of achieving the same function are within the scope of the invention.

Referring to fig. 3(a) and 3(b), four switch terminals 12 corresponding to the fourth switch AS1, the fifth switch AS2, the third switch AS3 and the sixth switch AS4 are disposed in the first slot 11 and are triggered by the first battery pack 10. The four switch terminals 22 corresponding to the first switch BS1, the second switch BS2, the third switch BS3 and the sixth switch BS4 are disposed in the second slot 12 and are triggered by the second battery pack 20.

Referring to fig. 5(a) to 5(c) in conjunction with fig. 4, the connection states of the switches corresponding to the three previous operating states are shown. Fig. 5(a) corresponds to the first operation state, in which only the first battery pack 10 is disposed in the first slot 11, and when the first battery pack 10 is inserted, the third switch AS3 and the sixth switch AS4 are turned off from on, and the fourth switch AS1 and the fifth switch AS2 are turned on from off. Then, referring to the right side, among the four switches corresponding to the four electrode terminals connected to the second battery pack 20, although the sixth switch AS4 is open, the fourth switch AS1 and the fifth switch AS2 are closed and conductive, and the sixth switch BS4 is kept closed and conductive, so that all the four electrode terminals corresponding to the second battery pack 20 are connected together. Referring to the left side, only the third switch AS3 is switched off among the four switches corresponding to the four electrode terminals connected to the first battery pack 10, but since the other third switch BS3 is not changed, the circuit connection effect corresponding to the four electrode terminals connected to the first battery pack 10 is not changed, the two battery packs in the first battery pack 10 are maintained in series, and the first battery pack 10 outputs a voltage of 48V to the outside.

Fig. 5(b) corresponds to the second operation state, and similar to fig. 5(a), only the second battery pack 20 is disposed in the second slot 12, after the second battery pack 20 is inserted, the third switch BS3 and the sixth switch BS4 are turned from on to off, and the first switch BS1 and the second switch BS2 are turned from off to on. Then, only the third switch BS4 is switched off among the four switches corresponding to the four electrode terminals connected to the right side of the second pack 20, but since the other sixth switch AS4 is not changed, the two battery packs in the second pack 20 are kept in series. In the four switches corresponding to the four electrode terminals connected to the first battery pack 10 on the left side, although the third switch BS3 is turned off, the first switch BS1 and the second switch BS2 are turned on, and the third switch AS3 is turned on, so that the four electrode terminals corresponding to the first battery pack 10 are all connected together, and the second battery pack 20 outputs a voltage of 48V to the outside.

Fig. 5(c) shows a third operating state, in which the first battery pack 10 and the second battery pack 20 are respectively disposed in the first slot 11 and the second slot 12, and after the first battery pack 10 is inserted, the third switch AS3 and the sixth switch AS4 are turned from on to off, and the fourth switch AS1 and the fifth switch AS2 are turned from off to on; after the second battery pack 20 is inserted, the third switch BS3 and the sixth switch BS4 are turned off from on, and the first switch BS1 and the second switch BS2 are turned on from off. Then, the two battery packs of the first battery pack 10 are connected in parallel, the two battery packs of the second battery pack 20 are connected in parallel, the first and second battery packs 20 are connected in series, and the output voltage is 48V.

In the above switch arrangement, the first switch BS1 and the second switch BS2 are used to connect the two battery packs in the battery pack 10 in parallel, and the fourth switch AS1 and the fifth switch AS2 are used to connect the two battery packs in the battery pack 20 in parallel. The two third switches AS3, BS3 are used to connect two battery packs in series in the battery pack 10, and the two sixth switches AS4, BS4 are used to connect two battery packs in series in the battery pack 20, which may be regarded AS series switches, and are normally closed switches in the present embodiment. In the same stage of circuit, if the series switch and the parallel switch are in a closed conducting state at the same time, a short circuit occurs. Of the four switches controlling the first battery pack 10, two parallel switches BS1, BS2 are triggered by the second battery pack 20, a series switch BS3 is triggered by the second battery pack 20, and another series switch AS3 is triggered by the first battery pack 10 itself. Of the four switches controlling the second battery pack 20, two parallel switches AS1, AS2 are triggered by the first battery pack 10, a series switch AS4 is triggered by the first battery pack 10, and another series switch BS4 is triggered by the second battery pack 20.

It can be seen that only when two battery packs are all inserted, two series switches corresponding to each battery pack are switched to be off, and meanwhile, two parallel switches are switched to be on, so that two battery packs of each battery pack are switched to be in parallel. If a single battery pack is inserted, although two parallel switches of another battery pack are closed and conducted, the absence of the series switch which can be triggered to be opened by the other battery pack can cause the parallel connection and the series connection of the circuit corresponding to the other battery pack, that is, the four electrode terminals corresponding to the other battery pack are all electrically connected with each other, similarly to the short circuit condition. And the two parallel switches of the inserted battery pack remain open due to the absence of the insertion of another battery pack, the series switch switched by itself of the two series switches is opened, but the series switch switched by the opposite battery pack remains connected in series, so that the two battery packs of the inserted battery pack remain connected in series.

The switch can realize the following functions: the insertion of a single battery pack, which outputs a voltage in a high-voltage state, allows all electrode terminals corresponding to another battery pack to be electrically connected together; the insertion of the two battery packs can enable each battery pack to be switched into a low-voltage state, so that the two battery packs are connected in series to form high-voltage output together. Each battery pack corresponds to two series switches, and only when two battery packs are respectively inserted into corresponding slots, the two series switches can be switched to be in parallel connection, so that two battery packs in the battery packs are connected in parallel. When one battery pack is used and another battery pack needs to be inserted, the tool can be stopped firstly and then the other battery pack is inserted, and the two battery packs are connected in series to output 48V voltage.

In this embodiment, all the switches are mechanical switches, and need to be triggered and switched by the insertion of the battery pack.

Carry out two

Referring to fig. 6, the difference between this embodiment and the first embodiment is that an electronic switch is used, and two series switches in the first embodiment can be combined into one series switch. The first group of control switches for adjusting the four-pole connection of the first battery pack 10 includes two parallel switches CS1, CS2 and a series switch CS3, the parallel switch CS1 is connected to the first negative terminal 101 and the second negative terminal 103, the parallel switch CS2 is connected to the first positive terminal 102 and the second positive terminal 104, and the series switch CS3 is connected to the second negative terminal 103 and the first positive terminal 102. The second group of control switches for adjusting the electrode connection of the second battery pack 20 includes two parallel switches DS1 and DS2 and a series switch DS3, the parallel switch DS1 is connected to the first negative terminal 105 and the second negative terminal 107, the parallel switch DS2 is connected to the first positive terminal 106 and the second positive terminal 108, the series switch DS3 is connected to the second negative terminal 107 and the first positive terminal 106, and the first battery pack 10 and the second battery pack 20 are connected in series. Each of the parallel switches CS1, CS2, DS1, and DS2 is a normally open switch and is initially in an open state, and each of the series switches CS3 and DS3 is a normally closed switch and is initially in a closed and conductive state, that is, under the condition that the switches are not switched, the first battery pack 10 and the second battery pack 20 can be connected in series, and the two battery packs in each

battery pack

10 and 20 are connected in series.

Referring to fig. 7, the electric tool 100 is further provided with a micro control unit MCU, all the switches are switched by the micro control unit MCU, the insertion of the first battery pack 10 and the second battery pack 20 does not directly cause any switch switching, and the

slots

11 and 12 are not provided with any switch terminals for controlling the switches.

Referring to fig. 8(a), after the MCU is powered on, the MCU sequentially detects a first voltage between A, B points at two ends of the first battery pack 10 and a second voltage between C, D points at two ends of the second battery pack 20, and if the first voltage is 48V and the second voltage is 0V, it indicates that the electric tool 100 is installed with only the first battery pack 10, and the MCU turns on the parallel switches DS1 and DS2 and keeps on the series switch DS3 corresponding to the first operating state, so that the four electrode terminals of the second battery pack 20 are all electrically connected to form a short circuit; the switches CS1, CS2, and CS3 in the first battery pack 10 are controlled to be kept unchanged, that is, the two battery packs in the first battery pack 10 are connected in series, and the output voltage is 48V.

Referring to fig. 8(b), if the first voltage is 0V and the second voltage is 48V, it indicates that the electric power tool 100 is installed with only the second battery pack 20, and corresponding to the second operating state, the MCU will close and conduct CS1 and CS2, and the series switch CS3 will be kept conducting, so that all the four electrode terminals corresponding to the first battery pack 10 are electrically connected to form a short-circuit-like circuit; the switches DS1, DS2, and DS3 in the second battery pack 20 are controlled to be kept unchanged, and the two battery packs in the second battery pack 20 are connected in series to output a voltage of 48V.

Referring to fig. 8(c), if it is detected that the first voltage and the second voltage are both 48V, it is described that the electric power tool 100 is installed with the first battery pack 10 and the second battery pack 20, and corresponding to the third operating state, the MCU will disconnect the series CS3 and the DS3, and then close and connect the parallel CS1, CS2, DS1, and DS2, that is, the two battery packs in each

battery pack

10, 20 are both switched to be parallel, the two battery packs 10, 20 are connected in series, and the overall output voltage is 48V.

EXAMPLE III

Referring to fig. 9, this embodiment is similar to the embodiment, except that all switches in the first embodiment are single-pole single-throw switches, and the switch using double-pole double-throw in this embodiment mode is replaced by a single-pole single-throw switch. Double pole double throw is equivalent to including two switches, but the switching of two switches can be realized synchronously through once triggering.

In the embodiment, the system comprises 2 parallel switches ASS1, BSS1 and two series switches ASS2 and BSS2, wherein the parallel switches ASS1, BSS1 and the series switches ASS2 and BSS2 are double-pole double-throw switches. The parallel switch BSS1 is equivalent to the first switch BS1 and the second switch BS1 in the first embodiment, and connects the left "1-" representing the first negative terminal 101 and the left "2-" representing the second negative terminal 103, the left "1 +" representing the first positive terminal 102 and the left "2 +" representing the second positive terminal 104, respectively, for connecting the two battery packs in the first battery pack 10 in parallel. The parallel switch ASS1 is equivalent to the fourth switch AS1 and the fifth switch AS2 in the first embodiment, and is connected to the right side "1-" representing the first negative terminal 105 and "2-" representing the second negative terminal 107, and "1 +" representing the first positive terminal 106 and "2 +" representing the second positive terminal 107, respectively, for connecting two battery packs in the second battery pack 20 in parallel.

The series switch ASS2 is equivalent to the third switch AS3 and the sixth switch AS4 in the first embodiment, and is connected to "2-" representing the second negative terminal 107 and "1 +" representing the first positive terminal 106, and "2-" representing the second negative terminal 103 and "1 +" representing the first positive terminal 102, respectively, for controlling a set of series circuits between the first battery pack 10 and the second battery pack 20, respectively. The series switch BSS2 is equivalent to the third switch BS3 and the sixth switch BS4 in the first embodiment, and is connected to "2-" representing the second negative terminal 107 and "1 +" representing the first positive terminal 106, and "2-" representing the second negative terminal 103 and "1 +" representing the first positive terminal 102, respectively, in the same manner as the series switch ASS2, for controlling another set of series circuits between the first battery pack 10 and the second battery pack 20. The parallel switches ASS1 and BSS1 are normally open switches and are in an off state initially; the series switches ASS2 and BSS2 are normally closed switches, and are initially in a closed conducting state, that is, in a state where the switches are not switched, the first battery pack 10 and the second battery pack 20 can be connected in series, and the two battery packs in each

battery pack

10 and 20 are connected in series, as in the first embodiment.

Referring to fig. 10, the first slot 11 for accommodating the first battery pack 10 is provided with two switch terminals 13 corresponding to the parallel switch ASS1 and the series switch ASS2, respectively, and the second slot 12 for accommodating the second battery pack 20 is provided with two switch terminals (not shown) corresponding to the parallel switch BSS1 and the series switch BSS2, respectively.

Referring to fig. 11(a), only the first battery pack 10 is inserted into the first slot 11, the series switch ASS2 is switched off, and the parallel switch ASS1 is switched on. The parallel switch BSS1 is kept open, and the series switch BSS2 is kept closed and turned on, so that the four electrode terminals corresponding to the second battery pack 20 are all electrically connected to each other. The two battery packs in the first battery pack 10 are connected in series and output 48V to the outside.

Referring to fig. 11(b), only the second battery pack 20 is inserted into the second slot 12, the series switch BSS2 is switched to be open, and then the parallel switch BSS1 is switched to be in a closed on state. The parallel switch ASS1 is kept open, and the series switch ASS2 is kept closed and conducted, so that all the four electrode terminals of the first battery pack 10 are electrically connected to each other, as described above, in this section, reference is made to the related contents of the first embodiment. The two battery packs in the second battery pack 20 are connected in series to output 48V externally.

Referring to fig. 11(c), the first battery pack 10 is inserted into the first slot 11, the series switch ASS2 is opened, and the parallel switch ASS1 is switched to a closed on state; at the same time as the second battery pack 20 is inserted into the second slot 12, the series switch BSS2 is opened and the shunt switch BSS1 is switched to a closed conducting state. The first battery pack 10 and the second battery pack 20 are connected in series, and the two battery packs in each

battery pack

10, 20 are connected in parallel to output 48V externally.

Example four

In the first embodiment, four

switch terminals

12, 22 are provided in each slot, and the battery packs 10, 20 inserted into the slots press the

switch terminals

12, 22 to trigger the corresponding switches. In this embodiment, these switch terminals are eliminated and a machine is used instead to achieve control. The difference between this embodiment and the first and third embodiments is that the specific triggering manner of the switch, and other parts, including the specific circuit principle, the setting manner and switching manner of the switch, are the same as those in the first embodiment, and reference may be made to the relevant contents in the first embodiment, which will only be briefly described below.

Referring to fig. 12 and 15, a first male plug 14 is disposed in one of the slots, the first male plug 14 includes an insulating body and four electrode terminals fixed on the insulating body, including a first negative terminal 101, a first positive terminal 102, a second negative terminal 103 and a second positive terminal 104, which are respectively connected to the first negative electrode, the second negative electrode, the first positive electrode and the second positive electrode of the first battery pack 10. A second male plug-in 24 is disposed in the other slot, the second male plug-in 24 includes an insulating body and four electrode terminals fixed on the insulating body, including a first negative terminal 105, a first positive terminal 106, a second negative terminal 107 and a second positive terminal 108, which are respectively connected with the first negative electrode, the second negative electrode, the first positive electrode and the second positive electrode of the second battery pack 20.

AS shown in fig. 4 to 5, the electric power tool 100 is provided with four control switches for controlling the first battery pack 10, including two parallel switches BS1 and BS2 and two series switches AS3 and BS 3; and four control switches for controlling the second battery pack 20, including two parallel switches AS1, AS2, two series switches AS4, BS 4. The parallel switches BS1, BS2, AS1, AS2 realize parallel control of the battery packs in the battery packs 10, 20 by connection with the aforementioned electrode terminals, and the series switches AS3, BS3, AS4, BS4 realize series control of the battery packs in the battery packs 10, 20 by connection with the aforementioned electrode terminals. All parallel switches BS1, BS2, AS1, AS2 are normally open switches, and all series switches AS3, BS3, AS4, BS4 are normally closed switches. That is, in a state where the switches are not switched, the first battery pack 10 and the second battery pack 20 may be connected in series, and the two battery packs in each of the battery packs 10 and 20 may be connected in series. The first battery pack 10 controls the switching of the parallel switches AS1, AS2 and the series switches AS3, AS4, and the second battery pack 20 controls the switching of the parallel switches BS1, BS2 and the series switches BS3, BS 4. When the two battery packs 10 and 20 are inserted, the two battery packs of each

battery pack

10 and 20 are switched to be in parallel connection, and the two battery packs 10 and 20 output 48V voltage together. If a single battery pack is inserted, the inserted battery pack outputs a voltage of 48V to the outside in such a manner that two battery packs are connected in series. The connection mode of each switch and the switching process of the power tool 100 in three operating states can be combined with the related contents in the first embodiment.

The structure of the gang switch and the connection condition with each electrode terminal will be described in detail below.

Referring to fig. 12 and 14, the power tool 100 of the present embodiment is provided with two linking switches 3 respectively disposed inside the two slots. The gang switch 3 is provided in a cavity on the back of the socket of the electric power tool 100. The ganged switch 3 comprises a contact piece 31, a ganged component 32, an elastic piece 33, a pressure plate component 34, a micro-button 35 and a plurality of screws 36. The jog button 35 is provided with a head portion 351 and a shaft portion 352, and the head portion 351 partially protrudes into the slot through the bottom wall of the corresponding slot to be activated by the first battery pack 10 or the first battery pack 20. The two ganged switches 3 have the same structure, and the following description will be made with respect to one ganged switch 3 as an example.

The linkage assembly 32 and the pressing plate assembly 34 are arranged approximately in parallel, the elastic member 33 is located between the linkage assembly 32 and the pressing plate assembly 34, and the pressing plate assembly 34 and the linkage assembly 32 are respectively provided with

accommodating cavities

340 and 320 for accommodating the elastic member 33, so that the elastic member 33 is prevented from being separated. The inching button 35, when the head 351 is pressed, drives the rod 352 to push the linkage assembly 32 toward the pressure plate assembly 34 and compress the elastic member 33. The linkage assembly 32 is substantially in the shape of a cross-piece, the mounting seat 15 is correspondingly provided on the electric power tool 100, the mounting seat 15 is provided with a mounting groove 151, and the linkage assembly 32 is accommodated in the mounting groove 151 and can slide up and down in the mounting groove 151 (as viewed in the placement direction in fig. 14).

Referring to fig. 15 and 18, two contact pieces 31 are respectively disposed at opposite ends of the mounting groove 151, wherein the two contact pieces 31 at one end are connected to the first positive terminal 102 and the second negative terminal 103 of the first male plug 14 by wires, and the two contact pieces 31 at the other end are connected to the first positive terminal 106 and the second negative terminal 107 of the second male plug 24 by wires. The other end of each contact strip 31 not wired is provided with a first contact (not numbered). The linkage assembly 32 includes an insulating base 321 and two guide tabs 322 disposed at opposite ends of the insulating base 321, the guide tabs 322 are disposed on a first side surface a of the insulating base 321 facing the inching button 35, and each of the guide tabs 322 is provided with two second contacts 323 for simultaneously contacting with the first contacts of the two contact pieces 31 disposed at the same end.

AS shown in fig. 22, the contact tab 31 electrically connected to the first battery pack 10 and the corresponding guide tab 322 form the series switch AS3 for connecting the first battery pack 10 in series, and the contact tab 31 electrically connected to the second battery pack 20 and the corresponding guide tab 322 form the series switch AS4 for connecting the first battery pack 20 in series. In the initial state, under the action of the elastic member 33, the guide tabs 322 are kept in contact with the corresponding two contact pieces 31, so that the series switches AS3 and AS4 form normally closed switches.

Referring to fig. 17 to 21, the pressing plate assembly 34 may be fastened to the screw post 16 around the mounting groove 151 by screws 36, and the pressing plate assembly 34 includes an insulating plate 341 and four conductive sheets 342 disposed on the insulating plate 341 and connected to the four

electrode terminals

105, 106, 107, and 108 of the second male plug 24, respectively. The conductive sheet 342 is provided with a third contact 343 exposed to face the linkage assembly 32 through the insulating sheet 341. As shown in fig. 19, the linkage assembly 32 has four adapters 324 on the second side B facing the pressing plate assembly 34 corresponding to the four conductive sheets 342 of the pressing plate assembly 34, and two adapters 324 corresponding to the first and second

negative terminals

105, 107 through the two conductive sheets 342 are connected through wires, and the other two adapters 324 corresponding to the first and second

positive terminals

106, 108 through the other two conductive sheets 342 are also connected through wires. As shown in fig. 19, each interposer 324 is provided with a fourth contact 325 corresponding to the third contact 343 of the conductive sheet 342. AS shown in fig. 22, the four conductive sheets 342, the four adaptor sheets 324 and the conductive wires together form the parallel switches AS1 and AS2 for connecting the two battery packs of the second battery pack 20 in parallel. In the initial state, under the action of the elastic element 33, the guide tabs 322 are separated from the corresponding two contact pieces 31, so that the parallel switches AS1 and AS2 form normally open switches. When the first battery pack 10 is inserted into the slot, the jog button 35 is pressed, and the jog button 35 pushes the link assembly 32 toward the pressing plate assembly 34 by means of the driving post 352, which is extended into the mounting groove 151. In the process, the contact piece 31 and the pressure plate assembly 34 are kept still, so that the contact piece 31 is separated from the guide piece 322, and the series switches AS3 and AS4 are changed from being closed to being opened; the switch plate 324 of the linkage assembly 32 contacts the corresponding conductive plate 342 of the pressure plate assembly 34, so that the parallel switches AS1 and AS2 are turned from open to closed. Thus, the insertion of the first battery pack 10 can realize the switching control of the parallel switches AS1 and AS2 and the series switches AS3 and AS4, and the first battery pack 10 outputs a voltage of 48V, and the specific switching state can be referred to fig. 5(a) and fig. 23. In the same way, another ganged switch 3 forms parallel switches BS1 and BS2 and series switches BS3 and BS4, when the second battery pack 20 is inserted into another slot, the parallel switches BS1 and BS2 and the series switches BS3 and BS4 can be switched completely, the second battery pack 20 outputs 48V voltage, and the specific switching state can refer to fig. 5 (b). If the first battery pack 10 and the second battery pack 20 are inserted simultaneously, all switches are switched, and the two battery packs 10 and 20 output a voltage of 48V together, and the specific switch states can be referred to fig. 5(c) and fig. 24.

EXAMPLE five

In the first to fourth embodiments, the output state of the battery pack is controlled by the switch, and when a

single battery pack

10, 20 is inserted, the inserted

battery pack

10, 20 forms a high-voltage output; when both battery packs 10, 20 are inserted, the

single battery pack

10, 20 forms a low voltage output, and the two battery packs 10, 20 form a high voltage output.

As another alternative, referring to fig. 25 to 27, a third battery pack 40 may be provided, and a parallel tab holder 50 may be disposed inside the third battery pack, the parallel tab holder 50 is provided with two U-shaped parallel terminals 51, and the U-shaped parallel terminals are connected to two electrode tabs 41 with the same polarity in two corresponding battery packs respectively under the action of springs 52, so that the two battery packs in the third battery pack 40 are in a parallel connection state and default to low voltage output. The electric power tool 100 is provided with a male serial socket 60, and the male serial socket 60 is provided with a protruding insulating post 61 and a serial terminal 62. When the third battery pack 40 needs to work, the insulating column 61 of the serial male socket 60 pushes the extension column 53 of the parallel plug sheet seat 50, so that the parallel terminal 51 is separated from the electrode female terminal 41, the parallel state of the two battery packs is cancelled, and then the serial terminal 62 of the serial male socket 60 is connected with two of the electrode female terminals 41 with different polarities in the two corresponding battery packs, so that the two battery packs in the third battery pack 40 are in the serial state, and high-voltage output is formed. The other positive electrode and the other negative electrode of the third battery pack 40, which are not in contact with the series terminal 62, are a total positive electrode and a total negative electrode, and two electrode terminals respectively connected with the total positive electrode and the total negative electrode are disposed in each slot of the electric tool 100.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The present invention is not intended to be limited to the above-described preferred embodiments, but rather, the invention is to be construed in all aspects as including all modifications, equivalents, and improvements that fall within the spirit and scope of the present invention.

Claims

1. The utility model provides an electric tool is equipped with and is used for four electrode terminal with two group battery complex of battery package, includes two positive terminals and two negative terminal, its characterized in that: the electric tool is provided with a linked switch, the linked switch comprises two contact pieces, a pressing plate assembly and a linkage assembly which is movably arranged, the two contact pieces are respectively and electrically connected with a positive terminal and a negative terminal of different corresponding battery packs, and the pressing plate assembly is provided with four conducting strips which are respectively and electrically connected with the four electrode terminals; the linkage assembly is provided with a first side surface and a second side surface which are opposite, wherein the first side surface is provided with a guide connecting piece, and the second side surface is provided with a plurality of adapter pieces; when the conducting sheets are contacted with the two contact sheets, the positive terminal and the negative terminal are electrically connected, and the adapter sheets are separated from the four conducting sheets; when the plurality of adapter plates are contacted with the four conducting plates, the two positive terminals are electrically connected, the two negative terminals are electrically connected, and the conducting plates are separated from the two contact plates.

2. The power tool of claim 1, wherein: in an initial state, the guide tabs are in contact with the two contact pieces, the linkage assembly moves towards the pressing plate assembly after being pressed, so that the guide tabs are separated from the two contact pieces, the number of the switching pieces is four, the switching pieces are respectively in contact with the four conducting strips, the conducting strips correspond to the two switching pieces of the two positive terminals and are electrically connected, and the conducting strips correspond to the two switching pieces of the two negative terminals and are electrically connected.

3. The power tool of claim 2, wherein: the linkage assembly further comprises an elastic piece arranged between the linkage assembly and the pressing plate assembly, and the elastic piece drives the linkage assembly to reset.

4. The power tool of claim 3, wherein: the pressing plate assembly and the linkage assembly are respectively provided with accommodating cavities for accommodating the elastic pieces.

5. The power tool of claim 3, wherein: the electric tool is further provided with a mounting seat, the linkage switch is mounted on the mounting seat, the mounting seat is provided with a mounting groove, the contact piece is fixed on the side wall of the mounting seat, the pressing plate assembly is fixed at the top of the mounting groove through a screw, and the linkage assembly is movably arranged in the mounting groove and located between the contact piece and the pressing plate assembly.

6. The power tool of claim 3, wherein: the linkage switch further comprises a micro-button, the micro-button is provided with a head and a rod, and the head is pressed to drive the rod to drive the linkage assembly.

7. A power tool system, characterized by: the electric tool system comprises a first battery pack, a second battery pack and the electric tool according to any one of claims 1 to 5, wherein the electric tool comprises two slots including a first slot for accommodating the first battery pack and a second slot for accommodating the second battery pack, four electrode terminals are arranged in each slot, and the two contact pieces and the four conductive pieces of the linked switch are respectively connected with the corresponding electrode terminals in the second slot.

8. The power tool system of claim 7, wherein: the linkage switch further comprises a micro button, the micro button is provided with a head and a rod, the head protrudes into the first slot, and the first battery pack is inserted into the first slot and drives the linkage assembly to move towards the pressing plate assembly.

9. The power tool system of claim 8, wherein: the four electrode terminals comprise a first positive terminal and a first negative terminal which are electrically connected with the same battery pack, and a second positive terminal and a second negative terminal which are electrically connected with another battery pack, wherein the two contact pieces are respectively and electrically connected with the first positive terminal and the second negative terminal; the linkage assembly is further provided with two other contact pieces, the two other contact pieces are respectively connected with the first positive terminal and the second negative terminal in the first slot, and the linkage assembly is further provided with another guide connection piece connected with the two other contact pieces.

10. The power tool system of claim 9, wherein: the electric tool is also provided with another linkage switch which has the same structure with the linkage switch, two contact pieces and four conductive pieces of the other linkage switch are respectively connected with the corresponding electrode terminals in the first slot, the other two contact pieces of the other linkage switch are respectively connected with the first negative terminal and the second positive terminal in the second slot, and the other linkage switch is driven when the second battery pack is inserted into the second slot; the second positive terminal in the first slot remains connected to the first negative terminal in the second slot.