Power tools and power tool systems

Abstract

The present invention provides an electric tool and an electric tool system, the electric tool system comprising the electric tool and two battery packs. The electric tool comprises two slots, each of which is provided with a group of electrode terminals for electrically connecting to the battery pack. The electric tool has a dual-pack working state and a single-pack working state. In the dual-pack working state, the two slots are respectively provided with battery packs; in the single-pack working state, only one of the slots is provided with a battery pack. In these two working states, the electric tool operates at the same rated voltage. The electric tool and the electric tool system of the present application can obtain the rated working voltage when configured with one or two battery packs and can operate normally.

Description

Technical Field

[0001] The present invention relates to an electric tool, in particular to an electric tool using a battery pack. Background Art

[0002] At present, there are more and more handheld power tools on the market, especially in the garden tool industry, such as pruners, mowers, tillers, and lawn mowers. In order to extend the use time and increase the power of power tools, while taking into account the simplicity and versatility of battery pack replacement, power tools usually adopt a multi-battery pack solution, and the most common one is a dual battery pack. When using, both battery packs need to be installed in the corresponding slots of the power tool to provide an output voltage that matches the rated working voltage of the power tool, so that the power tool can work normally; if only one battery pack is installed, the power tool cannot work normally.

[0003] Therefore, in view of the above problems, it is necessary to improve the existing electric tools. Summary of the invention

[0004] The invention provides an electric tool which can work normally under rated voltage in the case of single-pack or double-pack configuration.

[0005] Specifically, the present invention is implemented through the following technical solutions: an electric tool, the electric tool includes two slots, each of the slots is provided with a group of electrode terminals for electrically connecting to a battery pack; the electric tool has a single-pack working state and a double-pack working state, in the single-pack working state, only one of the slots is configured with a battery pack; in the double-pack working state, the two slots are respectively configured with battery packs, and in these two working states, the electric tool works at the same rated voltage. The electric tool of the present invention can obtain the rated working voltage when configured with one or two battery packs and can work normally.

[0006] According to one embodiment of the present invention, the two slots are defined as a first slot and a second slot, the battery pack configured in the first slot is defined as a first battery pack, and the battery pack configured in the second slot is defined as a second battery pack, the first battery pack and the second battery pack have the same structure and respectively include two battery packs with the same output voltage value; the power tool also includes two groups of control switches, a first control switch and a second control switch, wherein the first control switch is used to control the connection status of the two battery packs in the second battery pack, and the second control switch is used to control the connection status of the two battery packs in the first battery pack.

[0007] According to one embodiment of the present invention, each of the battery packs has a positive electrode and a negative electrode, and each group of electrode terminals includes a first negative terminal and a second negative terminal respectively connected to the negative electrodes of the two battery packs, and a first positive terminal and a second positive terminal respectively connected to the positive electrodes of the two battery packs, wherein the second negative terminal and the first positive terminal correspond to different battery packs; the first negative terminal corresponding to the first battery pack is the total negative electrode, the second positive terminal corresponding to the second battery pack is the total positive electrode, and the second positive terminal corresponding to the first battery pack is always connected to the first negative terminal corresponding to the second battery pack.

[0008] According to one embodiment of the present invention, the first control switch is arranged between the electrode terminals corresponding to the second battery pack, and the second control switch is arranged between the electrode terminals corresponding to the first battery pack; each of the control switches includes two parallel switches and at least one series switch, wherein one of the parallel switches connects the first negative terminal and the second negative terminal, the other parallel switch connects the first positive terminal and the second positive terminal, and the at least one series switch connects the second negative terminal and the first positive terminal; initially, the two parallel switches are in an open state, and the at least one series switch is in a closed state.

[0009] According to one embodiment of the present invention, each of the control switches includes two series switches respectively connected to the second negative terminal and the first positive terminal, the two parallel switches and one of the series switches in the first control switch are controlled and switched by the first battery pack inserted into the first slot, and the other series switch in the first control switch is controlled and switched by the second battery pack inserted into the second slot; the two parallel switches and one of the series switches in the second control switch are controlled and switched by the second battery pack inserted into the second slot, and the other series switch in the second control switch is controlled and switched by the first battery pack inserted into the first slot.

[0010] According to one embodiment of the present invention, the parallel switch and the series switch are both single-pole single-throw switches, and the electric tool is provided with four switch terminals in the first slot, which respectively control the two parallel switches and the two series switches triggered by the first battery pack.

[0011] According to one embodiment of the present invention, the two parallel switches and the two series switches controlled by the same battery pack respectively adopt double-pole double-throw switches, and the electric tool is provided with two switch terminals in the first slot, respectively controlling the two double-pole double-throw switches triggered by the first battery pack.

[0012] According to one embodiment of the present invention, the electric tool is provided with a linkage switch, which includes a plurality of contact pieces, a linkage assembly having a plurality of conductive pieces and a plurality of conductive pieces, a pressure plate assembly having a conductive piece and a micro-button, wherein the contact pieces and the conductive pieces are respectively connected to corresponding electrode terminals, so that two series switches controlled by the first battery pack are formed between the contact pieces, the conductive pieces and the plurality of electrode terminals, and two parallel switches controlled by the first battery pack are formed between the adapter pieces, the conductive pieces and the electrode terminals.

[0013] According to one embodiment of the present invention, the linkage switch includes an elastic member between the linkage assembly and the pressure plate assembly, the conductive sheet is provided on the side of the linkage assembly facing the contact sheet, the adapter sheet is provided on the side of the linkage assembly facing the pressure plate assembly, and the micro-button protrudes into the first slot; initially, the conductive sheet is connected to the contact sheet, and the adapter sheet is separated from the conductive sheet, and when the first battery pack is inserted into the first slot, the micro-button is pressed, and the micro-button drives the linkage assembly to move toward the pressure plate assembly, so that the conductive sheet is separated from the contact sheet, and the adapter sheet is in contact and connected with the conductive sheet.

[0014] According to one embodiment of the present invention, the electric tool is also provided with a microcontroller unit connected to the two parallel switches and the at least one series switch. If the microcontroller unit detects that only the first battery pack is connected to the first slot, the parallel switch of the first control switch is closed; if the microcontroller unit detects that only the second battery pack is connected to the second slot, the parallel switch of the second control switch is closed; if the microcontroller unit detects that the first battery pack and the second battery pack are respectively connected to the first slot and the second slot, the series switch of the second control switch and the series switch of the first control switch are disconnected, and then the parallel switch of the second control switch and the parallel switch of the first control switch are closed.

[0015] According to one embodiment of the present invention, the two battery packs have the same structure, and each battery pack includes two battery groups with the same output voltage value. When the two battery packs are configured on the power tool at the same time, the two battery groups in each battery pack are connected in parallel, and the two battery packs are connected in series; when only one battery pack is configured on the power tool, the two battery groups of the configured battery pack are connected in series.

[0016] According to one embodiment of the present invention, the battery pack is provided with a slidable parallel plug-in seat, the parallel plug-in seat connects the two battery packs in parallel, and the electric tool is provided with a series male socket, and when only one battery pack is configured on the electric tool, the series male socket pushes open the internal connector and connects the two battery packs in series.

[0017] According to one embodiment of the present invention, the battery pack is a single-pressed pack or a double-pressed pack.

[0018] The present invention also provides the following technical solution: an electric tool system, comprising an electric tool and two identical battery packs, the electric tool being provided with two slots for respectively configuring the two battery packs, the slots being provided with a group of electrode terminals, the electric tool having a single-pack working state and a double-pack working state, wherein only one battery pack is configured in the single-pack working state, and two battery packs are configured simultaneously in the double-pack working state, and in both working states, the electric tool operates at the same rated voltage. The electric tool of the present invention can obtain the rated working voltage when configured with one or two battery packs and can operate normally.

[0019] According to one embodiment of the present invention, the battery pack includes two battery groups with the same output voltage value, and the power tool also includes two groups of control switches, which respectively control the connection status of the two battery groups in the battery pack. When two battery packs are configured on the power tool at the same time, the two groups of control switches control the two battery groups in each battery pack to be connected in parallel; when only one battery pack is configured on the power tool, the corresponding control switch controls the two battery groups of the configured battery pack to be connected in series.

[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional combination diagram of the electric tool system of the present invention.

[0022] Figure 2(a) to Figure 2(c) Schematic diagram of three working states of two battery packs of the electric tool system of the present invention.

[0023] 3( a ) and 3 ( b ) are partial perspective views of an electric tool according to a first embodiment of the present invention.

[0024] Figure 4 FIG. 1 is a connection diagram of the switch of the electric tool in the initial state in the first embodiment.

[0025] Figure 5(a) to Figure 5(c) Schematic diagram of the connection of the switch in the first embodiment corresponding to three working states.

[0026] Figure 6 FIG. 1 is a connection diagram of a switch of an electric tool in an initial state according to a second embodiment of the present invention.

[0027] Figure 7 FIG. 4 is a schematic diagram showing the connection between the switch and the micro control unit in the second embodiment.

[0028] Figure 8(a) to Figure 8(c) Schematic diagram of the connection of the switch in the second embodiment corresponding to three working states.

[0029] Fig. 9 FIG. 1 is a connection diagram of a switch in an initial state in a third embodiment of the electric tool of the present invention.

[0030] Fig.10 It is a partial three-dimensional view of the electric tool of the third embodiment.

[0031] Figure 11(a) to Figure 11(c) Schematic diagram of the connection of the switch in the third embodiment corresponding to three working states.

[0032] Fig.12 FIG. 4 is a partial perspective view of an electric tool according to a fourth embodiment of the present invention.

[0033] Fig.13 It is a partial three-dimensional exploded view of the electric tool of the fourth embodiment.

[0034] Fig.14 It is a three-dimensional exploded view of the linkage switch of the electric tool according to the fourth embodiment.

[0035] Fig.15 This is the wiring diagram of the contact piece of the linkage switch.

[0036] Fig.16 This is the assembly drawing of the linkage components of the linkage switch.

[0037] Fig.17 This is the assembly drawing of the pressure plate assembly of the linkage switch.

[0038] Fig.18 The figure is a plan view of the linkage assembly of the linkage switch.

[0039] Fig.19 Another plan view of the linkage assembly of the linkage switch.

[0040] Fig. 20 This is the wiring diagram for the pressure plate assembly of the linkage switch.

[0041] Fig.21 A plan view of the pressure plate assembly of the linkage switch.

[0042] Fig. 22 This is the wiring schematic diagram of the linkage switch.

[0043] Fig.23 and Fig. 22 Similarly, the position change of the linkage switch is shown when the first battery pack is inserted.

[0044] Fig.24 and Fig. 22 Similarly, the position change of the linkage switch is shown when the first battery pack and the second battery pack are inserted at the same time.

[0045] Fig.25 FIG. 5 is a partial plan view of a battery pack for an electric tool according to a fifth embodiment of the present invention.

[0046] Fig.26 for Fig. 22 A partial plan view of the battery pack in another state.

[0047] Fig. 27 for Fig. 22 Plan view of the serial male socket in .

[0048] Description of Figure Numbers:

[0049] Power tool 100, first battery pack 10, second battery pack 20, first slot 11, second slot 21, first negative terminal 101, second negative terminal 103, first positive terminal 102, second positive terminal 104, first negative terminal 105, second negative terminal 107, first positive terminal 106, second positive terminal 108, switch terminal 12, switch terminal 22, switch terminal 13, first male plug 14, second male plug 24, mounting slot 15, mounting slot 1 51, screw column 16, linkage switch 3, contact piece 31, first contact 311, linkage assembly 32, insulating substrate 321, conductive piece 322, second contact 323, adapter piece 324, fourth contact 325, elastic member 33, pressure plate assembly 34, insulating plate 341, conductive piece 342, third contact 343, micro button 35, screw 36, parallel plug seat 50, electrode plug 41, parallel terminal 51, series male socket 60, insulating column 61, series terminal 62. DETAILED DESCRIPTION

[0050] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices, systems, equipment and methods consistent with some aspects of the present invention as detailed in the appended claims. In order to avoid obscuring the present invention with unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the drawings, and other details that are not closely related to the present invention are omitted.

[0051] The present invention provides a portable electric tool 100 that can be powered by an electric energy storage device for wireless operation. The electric tool 100 can be a pruner, a chain saw, a hair dryer, a cleaning machine, a lawn mower, a tiller, etc. In this embodiment, an electric drill is used as an example for description.

[0052] In this embodiment, the rated voltage of the power tool 100 is 48V, and two battery packs can be connected. Each battery pack includes at least two battery packs with the same rated voltage, and each battery pack may include one or more battery cells. In this embodiment, the output voltage of each battery pack is 24V. Figure 1 As shown, two slots are respectively provided on the left and right sides of the bottom of the electric tool 100, and each slot is used to accommodate and cooperate with one of the battery packs. The structures of the two battery packs are exactly the same, and the structures of the two slots are also exactly the same. For the convenience of description, the present invention defines the two battery packs as a first battery pack 10 and a second battery pack 20, respectively. Each battery pack includes two battery groups, and the two slots are respectively defined as a first slot 11 that cooperates with the first battery pack 10 and a second slot 21 that cooperates with the second battery pack 20.

[0053] Combination Figure 2(a) to Figure 2(c)As shown, the electric tool 100 of the present invention has three working states. The first state is that only the first battery pack 10 is configured in the first slot 11; the second state is that only the second battery pack 20 is configured in the second slot 12; and the third state is that the first battery pack 10 and the second battery pack 20 are respectively configured in the first slot 11 and the second slot 12. The first and second working states can be regarded as the same working state, that is, only one of the slots is configured with a battery pack, which can be defined as a single-pack working state, and the third working state can be defined as a dual-pack working state. Both working states can achieve a fixed voltage output of 48V, that is, whether one battery pack 10, 20 or two battery packs 10, 20 are configured, the electric tool 100 can obtain a rated working voltage of 48V and can work normally. Each battery pack of each battery pack 10, 20 is provided with a pair of positive and negative electrodes, specifically including a first negative electrode, a second negative electrode, a first positive electrode and a second positive electrode. As shown in FIG. 3(a) and FIG. 3(b), a group of electrode terminals is provided in each slot, 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, which are respectively connected to the first negative electrode, the second negative electrode, the first positive electrode, and the second positive electrode of the second battery pack 20. By setting different connection modes of the eight electrode terminals 101, 102, 103, 104, 105, 106, 107, and 108, the connection mode between the two battery packs inside the battery packs 10 and 20 inserted into the slots 11 and 12 can be adjusted.

[0054] Figure 2(a) to Figure 2(c) In the connection diagram of the electrode terminals, "1-" and "1+" on the left side of the figure 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. "1-" and "1+" on the right side of the figure 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 "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. The first negative terminal 101 represented by "1-" on the left side is the negative output terminal, and the second positive terminal 108 represented by "2+" on the right side is the positive output terminal. The following related figures follow this definition, and if there is any difference, it will be explained separately.

[0055] FIG2(a) corresponds to the first working state, in which the electric tool 100 is only equipped with the first battery pack 10. The "2-" on the left side of the figure representing the second negative terminal 103 and the "1+" on the right side of the figure representing the first positive terminal 102 are connected, so that the second negative electrode and the first positive electrode in the first battery pack 10 are connected, so that the two battery groups of the first battery pack 10 are connected in series, and the output voltage of the first battery pack 10 is 48V; the "1-" on the right side of the figure representing the first negative terminal 105, the "1+" on the right side of the figure representing the first positive terminal 106, the "2-" on the right side of the figure representing the second negative terminal 107 and the "2+" on the right side representing the second positive terminal 108 (total positive) are connected, that is, all four electrodes for electrical connection with the second battery pack 20 are electrically connected. Moreover, the "2+" on the left side representing the second positive terminal 104 is connected to the "2+" on the right side representing the second positive terminal 108 (total positive), so that the first battery pack 10 directly outputs to the outside, and the output voltage is 48V.

[0056] FIG2(b) corresponds to the second working state, in which the electric tool 100 is only equipped with the second battery pack 20. The "2-" on the right side of the figure represents the second negative terminal 107 and the "1+" on the first positive terminal 106 are connected, so that the first positive electrode and the second negative electrode in the second battery pack 20 are connected to form two battery groups in series of the second battery pack 20, and the output voltage of the second battery pack 20 is 48V; the "1-" on the left side of the figure represents the first negative terminal 101, the "1+" on the first positive terminal 102, the "2-" on the second negative terminal 103 and the "2+" on the second positive terminal 104 are connected, that is, the four electrodes for electrical connection with the first battery pack 10 are all electrically connected, and the "1-" on the right side representing the first negative terminal 105 is connected to the "1-" (total negative) on the left side representing the first negative terminal 101, and the second battery pack 20 directly outputs to the outside, and the output voltage is 48V.

[0057] Figure 2(c) corresponds to the third working state. The electric tool 100 is configured with the first battery pack 10 and the second battery pack 20 at the same time. The "1-" representing the first negative terminal 101 on the left is connected to the "2-" representing the second negative terminal 103, and the "1+" representing the first positive terminal 102 is connected to the "2+" representing the second positive terminal 104, so that the first negative electrode and the second negative electrode of the first battery pack 10 are connected, and the first positive electrode is connected to the second positive electrode, so that the two battery groups of the first battery pack 10 are in parallel state, and the output voltage of the first battery pack 10 is 24V. The "1-" on the right side representing the first negative terminal 105 is connected to the "2-" representing the second negative terminal 107, and the "1+" representing the first positive terminal 106 is connected to the "2+" representing the second positive terminal 108, so that the first negative electrode and the second negative electrode of the second battery pack 20 are connected, and the first positive electrode is connected to the second positive electrode, so that the two battery groups of the second battery pack 20 are in a parallel state, and the output voltage of the second battery pack 20 is 24V. In addition, the "1+" on the left side representing the first positive terminal 102 and the "2+" representing the second positive terminal 104 are connected to the "1-" on the right side representing the first negative terminal 105 and the "2-" representing the second negative terminal 107, that is, the positive electrode of the first battery pack 10 is connected to the negative electrode of the second battery pack 20, so that the first battery pack 10 and the second battery pack 20 are in a series state, forming a working state in which the two battery groups inside the single battery pack 10, 20 are connected in parallel and the two battery packs 10, 20 are connected in series, and the output voltage is 48V.

[0058] It can be seen that in the above three working states, the first battery pack 10 and the second battery pack 20 can provide a voltage of 48V when used alone, and can also provide a voltage of 48V when used together, ensuring that the power tool 100 works normally under the rated working voltage of 48V. Specifically, when the power tool 100 is working with a dual battery pack, the two battery packs in each battery pack are connected in parallel to provide a low-voltage output, and the two battery packs are connected in series; when the power tool 100 is working with a single battery pack, the two battery packs in the single battery pack are connected in series to provide a high-voltage output. The power tool system can adjust the connection method of the two battery packs in the battery pack according to the situation of the power tool 100 using the battery pack.

[0059] In this embodiment, the first battery pack 10 and the second battery pack 20 are dual-pressure packs, which output 48V when used alone, and output 24V respectively and are connected in series with each other when used together; as a variation, the first battery pack 10 and the second battery pack 20 can also use a single-pressure pack, which outputs 48V when used alone, and outputs 48V when used together and are connected in parallel with each other.

[0060] The present invention also provides a plurality of switches, which are arranged between the electrode terminals. By controlling the on and off of the switches, the connection mode of the two battery packs in the battery pack can be adjusted and controlled to achieve the switching and control mode of the above three working states. The present invention provides multiple embodiments of switch settings, which will be described below.

[0061] Embodiment 1

[0062] refer to Figure 4 As shown on the left side, the electric tool 100 is provided with a first group of control switches for controlling the first battery pack 10, including a first switch BS1 set between "1-" representing the first negative terminal 101 and "2-" representing the second negative terminal 103, a second switch BS2 set between "1+" representing the first positive terminal 102 and "2+" representing the second positive terminal 104, and two third switches AS3 and BS3 set between "2-" representing the second negative terminal 103 and "1+" representing the first positive terminal 102.

[0063] refer to Figure 4 As shown on the left side, the power tool 100 is provided with a second group of control switches for controlling the second battery pack 20, including a fourth switch AS1 set between "1-" representing the first negative terminal 105 and "2-" representing the second negative terminal 107, a fifth switch AS2 set between "1+" representing the first positive terminal 106 and "2+" representing the second positive terminal 108, and two sixth switches AS4 and BS4 set between "2-" representing the second negative terminal 103 and "1+" representing the first positive terminal 102.

[0064] 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 . Figure 4 The diagram shows the initial state of each switch, wherein the first switch BS1 and the second switch BS2 are normally open switches, i.e., they are initially in an open state, and the third switches AS3 and BS3 are normally closed switches, i.e., they are initially in an on state. The fourth switch AS1 and the fifth switch AS2 are normally open switches, and the sixth switches AS4 and BS4 are normally closed switches. The "2+" representing the second positive terminal 104 of the first battery pack 10 and the "1-" representing the first positive terminal 105 of the second battery pack 20 are directly connected. That is, when each switch does not switch state, 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, 20 can be connected in series.

[0065] It should be noted that a normally closed switch refers to a switch in which, in an initial state, its two contact parts are in a contact state so that the electrodes electrically connected to the two contact parts are in a connected state, and the electrical connection state of the two contact parts can be changed by an external object, so that the two contact parts are switched from a contact state to a disconnected state, for example, a normally closed switch. A normally open switch refers to a switch in which, in an initial state, its two contact parts are in a disconnected state so that the electrodes electrically connected to the two contact parts are in a disconnected state, and the electrical connection state of the two contact parts can be changed by an external object, so that the two contact parts are switched from a disconnected state to a connected state, for example, a normally open switch. Of course, a normally open switch is not limited to a normally open terminal, and a normally closed switch is not limited to a normally closed terminal. All implementations that can achieve the same function are within the protection scope of this invention.

[0066] 3(a) and 3(b), the four switch terminals 12 corresponding to the fourth switch AS1, the fifth switch AS2, the third switch AS3 and the sixth switch AS4 are arranged in the first slot 11 and 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 arranged in the second slot 12 and triggered by the second battery pack 20.

[0067] refer to Figures 5(a) to 5(c) , and combined with Figure 4 As shown, the connection states of each switch in the above three working states are shown. FIG5(a) corresponds to the first working state, where only the first battery pack 10 is configured in the first slot 11. After the first battery pack 10 is inserted, the third switch AS3 and the sixth switch AS4 change from closed to open, and the fourth switch AS1 and the fifth switch AS2 change from open to closed. Therefore, referring to the right side, among the four switches corresponding to the four electrode terminals of the second battery pack 20, although the sixth switch AS4 is open, the fourth switch AS1 and the fifth switch AS2 are closed, and the sixth switch BS4 remains closed, so that the four electrode terminals of the corresponding second battery pack 20 are all connected together. Referring to the left side, among the four switches corresponding to the four electrode terminals of the first battery pack 10, only the third switch AS3 is switched to open, but since the other third switch BS3 does not change, the circuit connection effect corresponding to the four electrode terminals of the first battery pack 10 remains unchanged, and the two battery groups in the first battery pack 10 remain in series, and the first battery pack 10 outputs a voltage of 48V to the outside.

[0068] FIG5(b) corresponds to the second working state. Similar to FIG5(a), only the second battery pack 20 is configured in the second slot 12. After the second battery pack 20 is inserted, the third switch BS3 and the sixth switch BS4 are changed from closed to open, and the first switch BS1 and the second switch BS2 are changed from open to closed. Therefore, among the four switches on the right side corresponding to the four electrode terminals of the second battery pack 20, only the third switch BS4 is switched to open, but because the other sixth switch AS4 is unchanged, the two battery groups in the second battery pack 20 remain in series. Among the four switches on the left side corresponding to the four electrode terminals of the first battery pack 10, although the third switch BS3 is opened, the first switch BS1 and the second switch BS2 are changed to closed, and the third switch AS3 remains 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.

[0069] FIG5(c) corresponds to the third working state. The first battery pack 10 and the second battery pack 20 are respectively arranged in the first slot 11 and the second slot 12. After the first battery pack 10 is inserted, the third switch AS3 and the sixth switch AS4 are changed from closed to open, and the fourth switch AS1 and the fifth switch AS2 are changed from open to closed; after the second battery pack 20 is inserted, the third switch BS3 and the sixth switch BS4 are changed from closed to open, and the first switch BS1 and the second switch BS2 are changed from open to closed. Thus, the two battery groups of the first battery pack 10 are connected in parallel, the two battery groups of the second battery pack 20 are connected in parallel, and the first and second battery packs 20 are kept in series, and the output voltage is 48V.

[0070] In the above switch settings, 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, which can be regarded as parallel switches, and are normally open switches in this embodiment. The two third switches AS3 and BS3 are used to connect the two battery packs in the battery pack 10 in series, and the two sixth switches AS4 and BS4 are used to connect the two battery packs in the battery pack 20 in series, which can be regarded as series switches, and are normally closed switches in this embodiment. In the same circuit, if the series switch and the parallel switch are in the closed conductive state at the same time, a short circuit will occur. Among the four switches that control the first battery pack 10, the two parallel switches BS1 and BS2 are triggered by the second battery pack 20, the series switch BS3 is triggered by the second battery pack 20, and the other series switch AS3 is triggered by the first battery pack 10 itself. Among the four switches controlling the second battery pack 20 , two parallel switches AS1 and AS2 are triggered by the first battery pack 10 , the series switch AS4 is triggered by the first battery pack 10 , and the other series switch BS4 is triggered by the second battery pack 20 .

[0071] It can be seen that only when two battery packs are inserted, the two series switches corresponding to each battery pack will be switched to open, and the two parallel switches will be switched to closed and turned on, so that the two battery groups of each battery pack are switched to parallel. If a single battery pack is inserted, although the two parallel switches of the other battery pack will be closed and turned on, due to the lack of the series switch that can only be triggered to open by the other battery pack itself, the circuit corresponding to the other battery pack will be in parallel and series at the same time, that is, the four electrode terminals of the other battery pack are all electrically connected to each other, similar to a short circuit. And due to the lack of insertion of another battery pack, the two parallel switches of the inserted battery pack remain open, and the series switch switched by itself is disconnected, but the series switch switched by the other battery pack remains in series, so the two battery groups of the inserted battery pack remain in series.

[0072] The above switch settings can achieve the following functions: the insertion of a single battery pack can make all the electrode terminals of the corresponding other battery pack be electrically connected together, and the single battery pack outputs voltage in a high-voltage state; the insertion of two battery packs can switch each battery pack to a low-voltage state, so that the two battery packs are connected in series to form a high-voltage output together. Each battery pack corresponds to two series switches. Only when the two battery packs are respectively inserted into the corresponding slots can the two series switches be switched to parallel connection, so that the two battery groups in the battery pack are connected in parallel. When a battery pack is already in use and another battery pack needs to be inserted, the tool can be stopped first, and then the other battery pack can be inserted. The two battery packs output a 48V voltage in series.

[0073] In this embodiment, all switches are mechanical switches, which need to be triggered by the insertion action of the battery pack.

[0074] Implementation II

[0075] refer to Figure 6As shown, the difference between this embodiment and the first embodiment is that an electronic switch is used, and the two series switches in the first embodiment can be merged into one series switch. The first group of control switches for adjusting the connection mode of the four electrodes of the first battery pack 10 includes two parallel switches CS1, CS2 and a series switch CS3, the parallel switch CS1 connects the first negative terminal 101 and the second negative terminal 103, the parallel switch CS2 connects the first positive terminal 102 and the second positive terminal 104, and the series switch CS3 connects the second negative terminal 103 and the first positive terminal 102. The second group of control switches for adjusting the connection mode of the electrodes of the second battery pack 20 includes two parallel switches DS1, DS2 and a series switch DS3, the parallel switch DS1 connects the first negative terminal 105 and the second negative terminal 107, the parallel switch DS2 connects the first positive terminal 106 and the second positive terminal 108, and the series switch DS3 connects 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. Among them, each parallel switch CS1, CS2, DS1, DS2 is a normally open switch, which is initially in an open state, and each series switch CS3, DS3 is a normally closed switch, which is initially in a closed and conducting state, that is, without any switching of the switches, the first battery pack 10 and the second battery pack 20 can be connected in series, and the two battery groups in each battery pack 10, 20 can be connected in series.

[0076] Combination Figure 7 As shown, the electric tool 100 is also provided with a microcontroller unit MCU. All switch switching is controlled by the microcontroller unit MCU. The insertion of the first battery pack 10 and the second battery pack 20 will not directly cause the switching of any switch. No switch terminals for controlling the switches are provided in the slots 11 and 12.

[0077] As shown in Figure 8(a), after the microcontroller unit MCU is powered on, it will sequentially detect the first voltage between the points A and B at both ends of the first battery pack 10 and the second voltage between the points C and D at both ends of the second battery pack 20. If the first voltage is detected to be 48V and the second voltage is 0V, it means that the power tool 100 is only installed with the first battery pack 10. Corresponding to the first working state mentioned above, the microcontroller unit MCU will close and turn on the parallel switches DS1 and DS2, and keep the series switch DS3 turned on, so that the four electrode terminals of the corresponding second battery pack 20 are all electrically connected to form a short-circuit circuit; the corresponding switches CS1, CS2, and CS3 in the first battery pack 10 are controlled to remain unchanged, that is, the two battery groups in the first battery pack 10 remain connected in series, and the output voltage is 48V.

[0078] As shown in Figure 8(b), if the first voltage is detected to be 0V and the second voltage is 48V, it means that the power tool 100 is only installed with the second battery pack 20. Corresponding to the second working state mentioned above, the microcontroller unit MCU will close and turn on CS1 and CS2, and the series switch CS3 will remain turned on to make all the four electrode terminals of the corresponding first battery pack 10 electrically connected to form a short-circuit circuit; the corresponding switches DS1, DS2, and DS3 in the second battery pack 20 remain unchanged, and the two battery groups in the second battery pack 20 remain connected in series, and the output voltage is 48V.

[0079] Combined with Figure 8(c), if it is detected that the first voltage and the second voltage are both 48V, it means that the power tool 100 is installed with the first battery pack 10 and the second battery pack 20. Corresponding to the third working state mentioned above, the microcontroller unit MCU will disconnect the series connection CS3 and DS3, and then close the parallel connection CS1, CS2 and DS1, DS2, that is, the two battery packs in each battery pack 10, 20 are switched to parallel connection, and the two battery packs 10, 20 are connected in series, and the overall output voltage is 48V.

[0080] Embodiment 3

[0081] refer to Fig. 9 As shown, this embodiment is similar to the first embodiment, except that all switches in the first embodiment are single-pole single-throw, and the double-pole double-throw switch used in this embodiment is replaced by a single-pole single-throw switch. The double-pole double-throw is equivalent to including two switches, but the switching of the two switches can be realized synchronously by one trigger.

[0082] In this embodiment, two parallel switches ASS1 and BSS1 and two series switches ASS2 and BSS2 are included. The parallel switches ASS1 and BSS1 and the series switches ASS2 and BSS2 are all 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 is respectively connected to the "1-" representing the first negative terminal 101 and the "2-" representing the second negative terminal 103 on the left, the "1+" representing the first positive terminal 102 and the "2+" representing the second positive terminal 104, and is used to connect 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 respectively connected to the "1-" representing the first negative terminal 105 and the "2-" representing the second negative terminal 107 on the right, the "1+" representing the first positive terminal 106 and the "2+" representing the second positive terminal 107, and is used to connect the two battery packs in the second battery pack 20 in parallel.

[0083] The series switch ASS2 is equivalent to the third switch AS3 and the sixth switch AS4 in the first embodiment, and is respectively 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, and is used to respectively control a set of series circuits between the first battery pack 10 and the second battery pack 20. The series switch BSS2 is equivalent to the third switch BS3 and the sixth switch BS4 in the first embodiment, and is connected in the same manner as the series switch ASS2, and is respectively 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, and is used to control 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 initially in an open state; the series switches ASS2 and BSS2 are normally closed switches and are initially in a closed and conducting state, that is, when 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, 20 can be connected in series, which is the same as in the first embodiment.

[0084] refer to Fig.10 As shown, the first slot 11 accommodating the first battery pack 10 is provided with two switch terminals 13 corresponding to the parallel switch ASS1 and the series switch ASS2, and the second slot 12 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.

[0085] As shown in 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 to a closed and conductive state. The parallel switch BSS1 remains open, and the series switch BSS2 remains closed and conductive, so that the four electrode terminals corresponding to the second battery pack 20 are all electrically connected to each other. The specific circuit switching process has been described in detail in the first embodiment, and the relevant contents in the first embodiment can be referred to, and will not be repeated here. The two battery packs in the first battery pack 10 remain in series and output 48V to the outside.

[0086] As shown in FIG. 11( b ), only the second battery pack 20 is inserted into the second slot 12, the series switch BSS2 is switched to the open state, and then the parallel switch BSS1 is switched to the closed state. The parallel switch ASS1 remains open, and the series switch ASS2 remains closed and turned on, so that all four electrode terminals of the first battery pack 10 are electrically connected to each other. As above, this part of the content can refer to the relevant content in the first embodiment. The two battery packs in the second battery pack 20 remain in series and output 48V to the outside.

[0087] Referring to FIG. 11(c), the first battery pack 10 is inserted into the first slot 11, the series switch ASS2 is disconnected, and the parallel switch ASS1 is switched to a closed conductive state; at the same time, the second battery pack 20 is inserted into the second slot 12, the series switch BSS2 is disconnected, and the parallel switch BSS1 is switched to a closed conductive state. Thus, 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, and output 48V to the outside.

[0088] Embodiment 4

[0089] In the first embodiment, four switch terminals 12 and 22 are set in each slot, and the battery packs 10 and 20 inserted into the slots press these switch terminals 12 and 22 to trigger the corresponding switches. In this embodiment, these switch terminals are cancelled and a mechanical control is adopted instead. The difference between this embodiment and the first and third embodiments lies in the specific triggering method of the switch. The other parts, including the specific circuit principle, the setting method and the switching method of the switch, are the same as those in the first embodiment. Please refer to the relevant content in the first embodiment, and only a brief description is given below.

[0090] refer to Fig.12 and Fig.15 As shown, a first male connector 14 is provided in one of the slots, and the first male connector 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 connector 24 is provided in the other slot, and the second male connector 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 to the first negative electrode, the second negative electrode, the first positive electrode and the second positive electrode of the second battery pack 20.

[0091] Combination Figure 4As shown in FIG. 5 , the electric tool 100 is provided with four control switches for controlling the first battery pack 10, including two parallel switches BS1, BS2 and two series switches AS3, BS3; and four control switches for controlling the second battery pack 20, including two parallel switches AS1, AS2 and two series switches AS4, BS4. The parallel switches BS1, BS2, AS1, AS2 realize parallel control of the battery groups in the battery packs 10, 20 by connecting to the aforementioned electrode terminals, and the series switches AS3, BS3, AS4, BS4 realize series control of the battery groups in the battery packs 10, 20 by connecting to the aforementioned electrode terminals. All the parallel switches BS1, BS2, AS1, AS2 are normally open switches, and all the series switches AS3, BS3, AS4, BS4 are normally closed switches. That is, when each switch is not switched, the first battery pack 10 and the second battery pack 20 can be connected in series, and the two battery groups in each battery pack 10, 20 can 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, BS4. When both battery packs 10, 20 are inserted, the two battery packs of each battery pack 10, 20 are switched in parallel, and the two battery packs 10, 20 jointly output a 48V voltage to the outside. If a single battery pack is inserted, the inserted battery pack outputs a 48V voltage to the outside in the form of two battery packs connected in series. The connection method of each switch and the switch switching process of the power tool 100 in the three working states can be combined with the relevant content in Example 1.

[0092] The structure of the linkage switch and the connection status with each electrode terminal will be described in detail below.

[0093] refer to Fig.12 and Fig.14 As shown, the electric tool 100 of this embodiment is provided with two linkage switches 3, which are respectively arranged on the inner sides of the two slots. The linkage switch 3 is arranged in the cavity on the back side of the slot of the electric tool 100. The linkage switch 3 includes a contact piece 31, a linkage assembly 32, an elastic member 33, a pressure plate assembly 34, a micro button 35 and a plurality of screws 36. The micro button 35 is provided with a head 351 and a rod 352, and the head 351 partly protrudes into the slot through the bottom wall of the corresponding slot to be triggered by the first battery pack 10 or the first battery pack 20. The two linkage switches 3 have the same structure, and the following will be described by taking one linkage switch 3 as an example.

[0094] The linkage assembly 32 is arranged roughly parallel to the pressure plate assembly 34, and the elastic member 33 is located between the linkage assembly 32 and the pressure plate assembly 34. The pressure plate assembly 34 and the linkage assembly 32 are respectively provided with accommodating cavities 340 and 320 for accommodating the elastic member 33 to prevent the elastic member 33 from being separated. After the head 351 of the micro-button 35 is compressed, the rod 352 drives the linkage assembly 32 toward the pressure plate assembly 34 and compresses the elastic member 33. The linkage assembly 32 is roughly in the shape of a cross. The electric tool 100 is correspondingly provided with a mounting seat 15, and the mounting seat 15 is provided with a mounting groove 151. The linkage assembly 32 is accommodated in the mounting groove 151 and can slide up and down in the mounting groove 151 (in Fig.14 Observe the placement direction in the figure).

[0095] refer to Fig.15 and Fig.18 As shown, two contact pieces 31 are respectively provided 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 connector 14 through wires, and the two contact pieces 31 at the other end are respectively connected to the first positive terminal 106 and the second negative terminal 107 of the second male connector 24 through wires. A first contact point (not numbered) is provided at the other end of each contact piece 31 that is not connected. The linkage assembly 32 includes an insulating substrate 321 and two conductive pieces 322 located at opposite ends of the insulating substrate 321, the conductive pieces 322 are arranged on the first side surface A of the insulating substrate 321 facing the micro-button 35, and each conductive piece 322 is provided with two second contacts 323, which are used to contact the first contacts of the two contact pieces 31 located at the same end at the same time.

[0096] Combination Fig. 22 As shown, the contact piece 31 electrically connected to the first battery pack 10 and the corresponding conductive piece 322 form the aforementioned series switch AS3 of the first battery pack 10, and the contact piece 31 electrically connected to the second battery pack 20 and the corresponding conductive piece 322 form the aforementioned series switch AS4 of the first battery pack 20. In the initial state, under the action of the elastic member 33, the conductive piece 322 maintains contact with the corresponding two contact pieces 31, so that the series switches AS3 and AS4 form normally closed switches.

[0097] refer to Figures 17 to 21 The pressure plate assembly 34 can be fixed on the screw column 16 around the installation groove 151 by screws 36. The pressure plate assembly 34 includes an insulating plate 341 and four conductive sheets 342 located on the insulating plate 341, which are respectively connected to the four electrode terminals 105, 106, 107, and 108 of the second male plug 24. The conductive sheet 342 is provided with a third contact 343 that passes through the insulating plate 341 and is exposed to the linkage assembly 32. Fig.19As shown, the linkage assembly 32 is provided with four adapters 324 on the second side B facing the pressure plate assembly 34 corresponding to the four conductive sheets 342 of the pressure plate assembly 34, and the two adapters 324 corresponding to the first and second negative terminals 105 and 107 through the two conductive sheets 342 are connected by wires, and the other two adapters 324 corresponding to the first and second positive terminals 106 and 108 through the other two conductive sheets 342 are also connected by wires. Fig.19 As shown, each transfer sheet 324 is provided with a fourth contact 325 corresponding to the third contact 343 of the conductive sheet 342. Fig. 22 As shown, the four conductive sheets 342, the four adapter sheets 324 and the wires together form the parallel switches AS1 and AS2 of the two battery groups of the second battery pack 20 connected in parallel. In the initial state, under the action of the elastic member 33, the conductive sheet 322 is separated from the corresponding two contact sheets 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 micro button 35 is pressed, and the micro button 35 pushes the linkage assembly 32 toward the pressure plate assembly 34 through its drive column 352 extending into the installation slot 151. During this process, the contact sheet 31 and the pressure plate assembly 34 remain stationary, so that the contact sheet 31 is separated from the conductive sheet 322, so that the series switches AS3 and AS4 are changed from closed to open; the adapter sheet 324 of the linkage assembly 32 contacts the corresponding conductive sheets 342 on the pressure plate assembly 34, respectively, so that the parallel switches AS1 and AS2 are changed from open to closed. Therefore, the insertion of the first battery pack 10 can realize the switching control of the parallel switches AS1, AS2 and the series switches AS3, AS4, and the first battery pack 10 outputs a voltage of 48V. The specific switch states can be referred to FIG. 5(a) and Fig.23 Similarly, another linkage switch 3 forms parallel switches BS1, BS2 and series switches BS3, BS4. When the second battery pack 20 is inserted into another slot, all the parallel switches BS1, BS2 and series switches BS3, BS4 can be switched, and the second battery pack 20 outputs a 48V voltage. For specific switch states, refer to FIG. 5(b). If the first battery pack 10 and the second battery pack 20 are inserted at the same time, all switches are switched, and the two battery packs 10 and 20 jointly output a 48V voltage. For specific switch states, refer to FIG. 5(c) and Fig.24 .

[0098] Embodiment 5

[0099] In the above-mentioned embodiments 1 to 4, the output state of the battery pack is controlled by a switch. 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.

[0100] As another alternative, refer to Figure 25 to Figure 27 As shown, a third battery pack 40 may be provided, wherein a parallel plug seat 50 may be provided inside the third battery pack 40, and the parallel plug seat 50 is provided with two U-shaped parallel terminals 51, which are respectively connected to two electrode plugs 41 of the same polarity in the corresponding two battery packs under the action of a spring 52, so that the two battery packs in the third battery pack 40 are in a parallel state, and the default low voltage output is achieved. A serial male socket 60 is provided on the power tool 100, and the serial male socket 60 is provided with a protruding insulating column 61 and a serial terminal 62. When the third battery pack 40 needs to be used for work, the insulating column 61 of the serial male socket 60 pushes the extension column 53 of the parallel plug seat 50, so that the parallel terminal 51 is separated from the electrode female terminal 41, and the parallel state of the two battery packs is cancelled, and then the serial terminal 62 of the serial male socket 60 is connected to two of the electrode female terminals 41 of the corresponding two battery packs with different polarities, so that the two battery packs in the third battery pack 40 are in a serial state, and a high voltage output is formed. Another positive electrode and another negative electrode of the third battery pack 40 that are not in contact with the series terminal 62 are the total positive electrode and the total negative electrode. Each slot of the power tool 100 is provided with two electrode terminals connected to the total positive and the total negative, respectively.

[0101] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0102] Terms such as "disposed" and the like appearing in this document may indicate that one component is directly attached to another component or that one component is attached to another component through an intermediate component. Features described in this document in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0103] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus.

[0104] The above electric tool of the present invention is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric tool, comprising two slots, each of which is provided with a group of electrode terminals for electrically connecting to a battery pack; characterized in that: The electric tool has a dual-pack working state and a single-pack working state. In the dual-pack working state, two of the slots are respectively equipped with battery packs; in the single-pack working state, only one of the slots is equipped with a battery pack, and in these two working states, the electric tool works at the same rated voltage; The two battery packs have the same structure, and each battery pack includes two battery groups with the same output voltage value. When the two battery packs are configured on the power tool at the same time, the two battery groups in each battery pack are connected in parallel, and the two battery packs are connected in series; when only one battery pack is configured on the power tool, the two battery groups of the configured battery pack are connected in series; The battery pack is a double-pressed pack; The electric tool also includes two groups of control switches, a first control switch and a second control switch, wherein the first control switch is used to control the connection status of the two battery packs in one of the battery packs, and the second control switch is used to control the connection status of the two battery packs in the other battery pack.

2. The electric tool according to claim 1, characterized in that: The two slots are defined as a first slot and a second slot, the battery pack configured in the first slot is defined as a first battery pack, and the battery pack configured in the second slot is defined as a second battery pack, the first battery pack and the second battery pack have the same structure and respectively include two battery packs with the same output voltage value.

3. The electric tool according to claim 2, characterized in that: Each of the battery packs has a positive electrode and a negative electrode, and each group of electrode terminals includes a first negative terminal and a second negative terminal respectively connected to the negative electrodes of the two battery packs, and a first positive terminal and a second positive terminal respectively connected to the positive electrodes of the two battery packs, wherein the second negative terminal and the first positive terminal correspond to different battery packs; the first negative terminal corresponding to the first battery pack is the total negative electrode, the second positive terminal corresponding to the second battery pack is the total positive electrode, and the second positive terminal corresponding to the first battery pack is always connected to the first negative terminal corresponding to the second battery pack.

4. The electric tool according to claim 3, characterized in that: The first control switch is arranged between the electrode terminals corresponding to the first battery pack, and the second control switch is arranged between the electrode terminals corresponding to the second battery pack; each of the control switches includes two parallel switches and at least one series switch, wherein one of the parallel switches connects the first negative terminal and the second negative terminal, the other parallel switch connects the first positive terminal and the second positive terminal, and the at least one series switch connects the second negative terminal and the first positive terminal; initially, the two parallel switches are in an open state, and the at least one series switch is in a closed state.

5. The electric tool according to claim 4, characterized in that: Each of the control switches includes two series switches respectively connected to the second negative terminal and the first positive terminal, the two parallel switches and one of the series switches in the first control switch are controlled and switched by the first battery pack inserted into the first slot, and the other series switch in the first control switch is controlled and switched by the second battery pack inserted into the second slot; the two parallel switches and one of the series switches in the second control switch are controlled and switched by the second battery pack inserted into the second slot, and the other series switch in the second control switch is controlled and switched by the first battery pack inserted into the first slot.

6. The electric tool according to claim 5, characterized in that: The parallel switch and the series switch are both single-pole single-throw switches. The electric tool is provided with four switch terminals in the first slot, which respectively control the two parallel switches and the two series switches triggered by the first battery pack.

7. The electric tool according to claim 5, characterized in that: The two parallel switches and the two series switches controlled by the same battery pack respectively adopt double-pole double-throw switches. The electric tool is provided with two switch terminals in the first slot, which respectively control the two double-pole double-throw switches triggered by the first battery pack.

8. The electric tool according to claim 5, characterized in that: The electric tool is provided with a linkage switch, which includes a plurality of contact pieces, a linkage assembly having a plurality of conductive pieces and a plurality of conductive pieces, a pressure plate assembly having a conductive piece and a micro-button, wherein the contact pieces and the conductive pieces are respectively connected to the corresponding electrode terminals, so that two series switches controlled by the first battery pack are formed between the contact pieces, the conductive pieces and the plurality of electrode terminals; an adapter piece is provided on the side of the linkage assembly facing the pressure plate assembly, and two parallel switches controlled by the first battery pack are formed between the adapter piece, the conductive piece and the electrode terminals.

9. The electric tool according to claim 8, characterized in that: The linkage switch includes an elastic member between the linkage component and the pressure plate component, the conductive sheet is provided on the side of the linkage component facing the contact sheet, and the micro-button protrudes into the first slot; initially, the conductive sheet is connected to the contact sheet, and the adapter sheet is separated from the conductive sheet, and when the first battery pack is inserted into the first slot, the micro-button is pressed to drive the linkage component to move toward the pressure plate assembly, the conductive sheet is separated from the contact sheet, and the adapter sheet is in contact and connected with the conductive sheet.

10. The electric tool according to claim 4, characterized in that: The electric tool is also provided with a microcontroller unit connected to the two parallel switches and the at least one series switch. If the microcontroller unit detects that only the first battery pack is connected to the first slot, the parallel switch of the second control switch is closed; if the microcontroller unit detects that only the second battery pack is connected to the second slot, the parallel switch of the first control switch is closed; if the microcontroller unit detects that the first battery pack and the second battery pack are respectively connected to the first slot and the second slot, the series switch of the second control switch and the series switch of the first control switch are disconnected, and then the parallel switch of the second control switch and the parallel switch of the first control switch are closed.

11. The electric tool according to claim 1, characterized in that: The battery pack is provided with a slidable parallel plug seat, the parallel plug seat connects the two battery packs in parallel, and the electric tool is provided with a series male socket. When only one battery pack is configured on the electric tool, the series male socket pushes open the parallel plug seat and connects the two battery packs in series.

12. An electric tool system, comprising an electric tool and two battery packs of the same structure, wherein the electric tool is provided with two slots for respectively arranging the two battery packs, each of the slots being provided with a group of electrode terminals electrically connected to the corresponding battery pack, characterized in that: The electric tool has a single-pack working state and a dual-pack working state, wherein only one battery pack is configured in the single-pack working state, and two battery packs are configured simultaneously in the dual-pack working state, and in both working states, the electric tool operates at the same rated voltage; Each of the battery packs includes two battery groups with the same output voltage value. When the two battery packs are configured on the power tool at the same time, the two battery groups in each battery pack are connected in parallel and the two battery packs are connected in series. When only one of the battery packs is configured on the power tool, the two battery groups of the configured battery pack are connected in series. The battery pack is a double-pressed pack; The electric tool also includes two groups of control switches, a first control switch and a second control switch, wherein the first control switch is used to control the connection status of the two battery packs in one of the battery packs, and the second control switch is used to control the connection status of the two battery packs in the other battery pack.

13. The electric tool system according to claim 12, characterized in that: When two of the battery packs are configured on the power tool at the same time, the two groups of control switches control the two battery packs in each battery pack to be connected in parallel, and the two battery packs to be connected in series; when only one of the battery packs is configured on the power tool, the corresponding control switch controls the two battery packs of the configured battery pack to be connected in series.

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