CN109360929B - Electric energy storage device and electric tool - Google Patents

Abstract

The invention provides an electric energy storage device, which comprises N energy units with equal voltage and can provide at least three output voltages. N is the total number, and N energy units are equally divided into a plurality of energy unit modules, and each energy unit module is provided with a control part in the module. In the initial state, the in-module control unit connects the energy units in the same energy unit module in parallel. The electric power tool is plugged into the electric energy storage device by using different plugs so that the electric power tool outputs one of at least three output voltages to the electric power tool using the electric energy storage device. By the arrangement, the application range of the electric energy storage device is increased, and the use cost is reduced.

Description

Electric energy storage device and electric tool

Technical Field

The present invention relates to the technical field of electric tools, and in particular to an electric energy storage device and an electric tool using the electric energy storage device.

Background technique

In the garden machinery and power tool industries, electric tools usually have a rated working voltage, that is, machines with different voltage platforms require battery packs with different voltage platforms to provide power. Therefore, different battery packs need to be prepared to adapt to electric tools with different rated working voltages, which increases the cost of use and causes waste of resources.

In view of this, it is necessary to design an improved electric energy storage device and an electric tool using the electric energy storage device to solve the above problems.

Summary of the invention

An object of the present invention is to provide an electric energy storage device capable of providing at least three output voltages and an electric tool using the electric energy storage device.

To achieve the above-mentioned purpose of the invention, the present invention provides an electric energy storage device, including N energy units with equal voltages, which can provide at least three output voltages; N is a composite number, and the N energy units are equally divided into a number of energy unit modules, each energy unit module has an internal module control unit; in an initial state, the internal module control unit connects the energy units in the same energy unit module in parallel.

As a further improvement of the present invention, the positive and negative electrodes of each energy unit module are correspondingly connected to a pair of voltage output terminals, and the energy unit modules are connected in series or in parallel by plugging several pairs of the voltage output terminals into docking plugs.

As a further improvement of the present invention, the electric energy storage device also has an inter-module control unit arranged between the several energy unit modules; in an initial state, the inter-module control unit connects the several energy unit modules in parallel so that the several energy units are connected in parallel.

As a further improvement of the present invention, the electric energy storage device has two voltage output terminals connected to the total positive and total negative electrodes of the plurality of energy unit modules connected in parallel or in series.

As a further improvement of the present invention, N is four; the four energy units are equally divided into two energy unit modules, and the control part in the module includes a normally open switch and two normally closed switches; the normally closed switch and the normally open switch each include two contact parts connected to the electrodes of the energy unit; the two contact parts of the two normally closed switches are respectively connected to the electrodes of the same polarity of different energy units, and control the connection or disconnection of the electrodes of the same polarity of two energy units in the same energy unit module; the two contact parts of the normally open switch are respectively connected to one group of electrodes of opposite polarity of different energy units, and control the disconnection or connection of the electrodes of opposite polarity of different energy units in the same energy unit module, and the one normally open switch and the two normally closed switches jointly control the two energy units in the same energy unit module to be in a parallel or series connection state.

As a further improvement of the present invention, N is four; the four energy units are equally divided into two energy unit modules, and the intra-module control unit and the inter-module control unit each include a normally open switch and two normally closed switches; the normally closed switch and the normally open switch each include two contact portions connected to the electrodes of the energy unit; the two contact portions of the two normally closed switches of the intra-module control unit are respectively connected to electrodes of the same polarity of different energy units, controlling the connection or disconnection of the electrodes of the same polarity of two energy units in the same energy unit module; the two contact portions of the normally open switch of the intra-module control unit are respectively connected to one group of electrodes of opposite polarity of different energy units, controlling the disconnection or connection of electrodes of opposite polarity of different energy units in the same energy unit module, and the one normally open switch and the two normally closed switches of the intra-module control unit jointly control the two energy units in the same energy unit module to be in a parallel or series connection state.

As a further improvement of the present invention, the two contact parts of the two normally closed switches of the inter-module control part are respectively connected to electrodes with the same polarity of different energy unit modules, controlling the connection or disconnection of the electrodes with the same polarity of the two energy unit modules; the two contact parts of the normally open switch of the inter-module control part are respectively connected to one group of electrodes with opposite polarity of different energy unit modules, controlling the disconnection or connection of electrodes with opposite polarity of different energy unit modules, and the one normally open switch and two normally closed switches of the inter-module control part jointly control the two energy unit modules to be in a parallel or series connection state.

As a further improvement of the present invention, N is six; the six energy units are equally divided into two energy unit modules, and the control part in the module includes two normally open switches and four normally closed switches; the normally closed switch and the normally open switch each include two contact parts connected to the electrodes of the energy unit; the two contact parts of the four normally closed switches are respectively connected to the electrodes with the same polarity of different energy units, so as to control the connection or disconnection of the electrodes with the same polarity of different energy units in the same energy unit module; the two contact parts of the two normally open switches are respectively connected to the electrodes with opposite polarities of different energy units, so as to control the disconnection or connection of the electrodes with opposite polarities of different energy units in the same energy unit module, and the two normally open switches and the four normally closed switches of the control part in the module jointly control the three energy units in the same energy unit module to be in parallel or series connection state.

As a further improvement of the present invention, in the initial state, the two normally open switches and the four normally closed switches jointly control the three energy units in the same energy unit module to be connected in parallel.

In order to achieve the above-mentioned purpose of the invention, the present invention also provides an electric tool, which uses the electric energy storage device described in any of the technical solutions mentioned above.

The beneficial effects of the present invention are as follows: the electric energy storage device of the present invention comprises N energy units with equal voltages, N being a composite number, the N energy units being equally divided into a plurality of energy unit modules, each energy unit module having an internal module control unit, and in an initial state, the internal module control unit connects the energy units in the same energy unit module in parallel. By using different plugs to plug into the electric energy storage device, it outputs at least one of three output voltages to the electric tool using the electric energy storage device. Such a configuration increases the applicable scope of the electric energy storage device and reduces the use cost.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing the connection of N internal energy units of the first embodiment of the electric energy storage device of the present invention.

FIG. 2 is a circuit diagram of the electric energy storage device of the first embodiment when it cooperates with the low-voltage plug.

FIG3 is a circuit diagram of the electric energy storage device of the first embodiment when it cooperates with the medium voltage plug.

FIG. 4 is a schematic diagram showing the effect of the cooperation between the electric energy storage device and the high-voltage plug of the first embodiment.

FIG5 is a circuit diagram of the electric energy storage device of the first embodiment when it cooperates with the high-voltage plug.

FIG. 6 is a schematic diagram of circuit connections of N internal energy units of the second embodiment of the electric energy storage device of the present invention.

FIG. 7 is a circuit diagram of the electric energy storage device of the second embodiment when it cooperates with the low-voltage plug.

FIG8 is a schematic diagram showing the effect of the cooperation between the electric energy storage device and the medium voltage plug of the second embodiment.

FIG. 9 is a circuit diagram of the electric energy storage device of the second embodiment when it cooperates with the medium voltage plug.

FIG. 10 is a schematic diagram showing the effect of the cooperation between the electric energy storage device and the high-voltage plug of the second embodiment.

FIG. 11 is a schematic structural diagram of the high voltage plug in FIG. 10 .

FIG. 12 is a schematic diagram of the structure of the electric energy storage device of the second embodiment when it cooperates with the high-voltage plug.

FIG. 13 is a circuit diagram of the electric energy storage device of the second embodiment when it cooperates with the high-voltage plug.

FIG. 14 is a schematic diagram showing the connection of N internal energy units of the third embodiment of the electric energy storage device of the present invention.

FIG. 15 is a schematic circuit diagram of the electric energy storage device of the third embodiment when it cooperates with the low-voltage plug.

FIG. 16 is a schematic diagram of a circuit when the electric energy storage device in the third embodiment cooperates with the first medium voltage plug.

FIG. 17 is a schematic diagram of a circuit diagram of the electric energy storage device in the third embodiment cooperating with the second medium voltage plug.

FIG. 18 is a schematic diagram of a circuit when the electric energy storage device in the third embodiment cooperates with the second medium voltage plug.

FIG. 19 is a schematic diagram of a circuit diagram of the cooperation between the electric energy storage device and the high-voltage plug in the third embodiment.

FIG. 20 is a schematic diagram of a circuit diagram of the electric energy storage device in the third embodiment when it cooperates with the high-voltage plug.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to the scheme of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so 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 inherent to such process, method, article or apparatus.

Please refer to Figures 1 to 20. The present invention provides an energy storage device, which includes N energy units with equal voltages. The energy unit refers to an object that can provide electrical energy, such as a battery cell, a lithium battery or other energy carrier. Of course, multiple batteries can also be electrically combined to form an energy unit; the battery includes but is not limited to rechargeable batteries such as lithium batteries, nickel-hydrogen batteries, and cadmium-nickel batteries. The rated voltage of the energy unit is nV. Among them, N is a composite number, which refers to a natural number that can be divided by other numbers (except 0) in addition to 1 and itself. The smallest composite number is four. N energy units are equally divided into M energy unit modules, and each energy unit module has an internal module control unit; in the initial state, the internal module control unit connects N/M energy units in the same energy unit module in parallel. It should be noted that the measured voltage of each energy unit is n±5%V and can be regarded as equal.

By using different plugs to plug into the electric energy storage device to change the connection state of N/M energy units in the same energy unit module and the connection state between different energy unit modules, the N energy units are in one of the states of all parallel connection, all series connection, series connection of energy units in the same energy unit module, parallel connection between different energy unit modules, or parallel connection of energy units in the same energy unit module, and series connection between different energy unit modules, so as to output one of at least three voltages that the electric energy storage device can provide to the electric tool using the electric energy storage device. In different connection states, the N energy units are all electrically connected to the electric tool.

Please refer to Figures 1 to 5. In Example 1, the electric energy storage device includes four energy units with the same voltage, all of which are nV; the four energy units are equally divided into two energy unit modules, namely energy unit module 10a and energy unit module 20a; the socket of the electric energy storage device includes an internal module control unit that connects two energy units in the same energy unit module in parallel and four voltage output terminals corresponding to the positive and negative electrodes of the two energy unit modules, namely: voltage output terminals 101a and 102a connected to the positive and negative electrodes of the energy unit module 10a and voltage output terminals 201a and 202a connected to the positive and negative electrodes of the energy unit module 20a.

Specifically, the control unit in the module includes two normally open switches and four normally closed switches. Each energy unit module is provided with a normally open switch 30a and two normally closed switches 41a and 42a to connect two energy units in the same energy unit module in parallel. In this embodiment, the normally open switch 30a and the two normally closed switches 41a and 42a each include two contact portions (not numbered) connected to the electrodes of the energy unit. The two contact portions of the normally closed switches 41a and 42a are respectively connected to electrodes with the same polarity of different energy units in the same energy unit module, such as: the two contact portions of the normally closed switch 41a are respectively connected to the negative electrodes of different energy units, and the two contact portions of the normally closed switch 42a are respectively connected to the positive electrodes of different energy units in the same energy unit module; the two contact portions of the normally open switch 30a are respectively connected to electrodes with opposite polarities of different energy units in the same energy unit module to realize parallel connection of two energy units in the same energy unit module. That is, in the initial state, the two energy units in the same energy unit module are connected in parallel.

It should be noted that a normally closed switch refers to a switch in which, in the 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 terminal; a normally open switch refers to a switch in which, in the 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 terminal. 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.

Referring to FIG. 2 and in combination with FIG. 1 , the electric tool with a working voltage of nV has a low-voltage plug (not shown), and the low-voltage plug has two connecting pieces that connect in parallel the voltage output terminals with the same polarity among the four voltage output terminals. When the low-voltage plug is matched with the socket, one connecting piece connects the voltage output terminal 101a with the voltage output terminal 201a, and the other connecting piece connects the voltage output terminal 102a with the voltage output terminal 202a, so that the two energy unit modules are connected in parallel, as shown in FIG. 2 .

That is, when the low-voltage plug is matched with the electric energy storage device, the two energy units in the same energy unit module are maintained in parallel connection through the control part inside the module, and the two energy unit modules are connected in parallel through two connecting pieces to respectively connect the voltage output terminals of the same polarity to achieve parallel connection, so that the four energy units are connected in parallel to output low voltage nV to the power tool.

Please refer to Figure 3 and combine it with Figure 1. The electric tool with an operating voltage of 2nV has a medium voltage plug (not shown), and the medium voltage plug has a connecting piece for connecting a group of voltage output terminals with different polarities of different energy unit modules among the four voltage output terminals. The connecting piece connects the voltage output terminals 101a and 202a or connects the voltage output terminals 201a and 102a; when the medium voltage plug is plugged into the socket, the voltage output terminals with different polarities of a group of different energy unit modules among the four voltage output terminals are connected so that two energy unit modules are connected in series. The connection circuit of the four energy units is shown in Figure 3.

That is, when the medium voltage plug is matched with the electric energy storage device, the two energy cells in the same energy cell module are connected in parallel through the control unit in the module, and the two energy cell modules are connected in series through the connecting piece, so that the two energy cell modules are connected in series. The parallel voltage of the same energy cell module is nV, and the voltage of the two energy cell modules connected in series is 2nV, that is, the two energy cells in the same energy cell module are connected in parallel, and the two energy cell modules are connected in series to output the medium voltage 2nV to the power tool.

Please refer to FIG. 4 and FIG. 5 , the electric tool with a working voltage of 4nV has a high-voltage plug, and the high-voltage plug is provided with an insulating portion 51a, a conductive portion 61a and a connecting portion (not shown) for connecting two energy unit modules in series. When the high-voltage plug is plugged into the socket, the insulating portion 51a contacts the two contact portions of the normally closed switches 41a and 42a, and the conductive portion 61a contacts the two contact portions of the normally open switch 30a, so that the electrodes with opposite polarities of different energy units in the same energy unit module are switched from the disconnected state to the connected state, and the electrodes with the same polarity of different energy units in the same energy unit module are switched from the connected state to the disconnected state, that is, the two energy units in the same energy unit module are connected in series, and the series voltage is 2nV. The connecting portion connects the voltage output terminals with different polarities of one group of different energy unit modules among the four voltage output terminals so that the two energy unit modules are connected in series. The connection circuit diagram of the four energy units is shown in FIG. 5 , so that the four energy units are connected in series to output a high voltage of 4nV to the electric tool.

That is, when an electric tool with an operating voltage of 4nV uses the electric energy storage device, the high-voltage plug cooperates with the control unit inside the module to switch the energy units in the same energy unit module from parallel connection to series connection, and connects two energy unit modules in series through the connecting part, so that the four energy units in the electric energy storage device are connected in series, and a high voltage of 4nV is output to the electric tool.

In other embodiments, the electric energy storage device also has an inter-module control unit that connects M energy unit modules in parallel and two voltage output terminals that are connected correspondingly to the total positive and total negative electrodes after the M energy unit modules are connected in parallel, that is, in the initial state, the N energy units in the electric energy storage device are in a parallel connection state.

Please refer to Figures 6 to 11. In Example 2, the electric energy storage device includes four energy units with equal voltages, all of which are nV; the four energy units are equally divided into two energy unit modules, namely energy unit module 10b and energy unit module 20b; the socket of the electric energy storage device includes an intra-module control unit that connects two energy units in the same energy unit module in parallel, an inter-module control unit that connects the two energy unit modules in parallel, and two voltage output terminals 301b and 302b that are connected to the positive and negative electrodes of the two energy unit modules connected in parallel.

Specifically, the control part within the module includes two normally open switches and four normally closed switches. Each energy unit module is provided with a normally open switch 30b and two normally closed switches 41b and 42b to connect the two energy units in the same energy unit module in parallel; the structure of the control part within the module and its connection relationship with the two energy units in the same energy unit module are the same as those in Example 1 and will not be repeated here.

The inter-module control unit is described in detail below: In this embodiment, the inter-module control unit includes a normally open switch 31b and two normally closed switches 43b and 44b, each including two contact portions (unnumbered) connected to the electrodes of the energy unit, and the two contact portions of the normally closed switches 43b and 44b are respectively connected to electrodes of the same polarity of different energy unit modules, such as: the two contact portions of the normally closed switch 43b are respectively connected to the negative electrodes of different energy unit modules, and the two contact portions of the normally closed switch 44b are respectively connected to the positive electrodes of different energy unit modules; the two contact portions of the normally open switch 31b are respectively connected to electrodes of opposite polarities of different energy unit modules to achieve parallel connection of two energy unit modules, that is, two energy units in the same energy unit module among the four energy units are connected in parallel through the intra-module control unit, and the two energy unit modules are connected in parallel through the inter-module control unit to achieve parallel connection of four energy units. The connection circuit diagram of the four energy units is shown in Figure 7, that is, in the initial state, the four energy units in the electric energy storage device are connected in parallel, and the voltage is nV.

As shown in FIG. 7 , the electric tool with a working voltage of low voltage nV has a low voltage plug, and the low voltage plug has a connecting piece for plugging with two voltage output terminals 301b and 302b. Since the four energy units of the electric energy storage device are in a parallel connection state in the initial state, as shown in FIG. 7 , the voltage thereof is nV. Therefore, it is only necessary to connect the two connecting pieces on the low voltage plug with the two voltage output terminals 301b and 302b respectively to realize outputting low voltage nV to the electric tool using the electric energy storage device.

Please refer to Figures 8 and 9, the electric tool with a working voltage of medium voltage 2nV has a medium voltage plug, and the medium voltage plug is provided with an insulating portion 51b, a conductive portion 61b and connecting pieces respectively connected to two voltage output terminals. When the medium voltage plug is plugged into the socket, the insulating portion 51b contacts the two contact portions of the normally closed switches 41b and 42b in the control portion in the module, and the conductive portion 61b contacts the two contact portions of the normally open switch 30b in the control portion in the module, so that the electrodes with opposite polarities of different energy units in the same energy unit module are switched from the disconnected state to the connected state, and the electrodes with the same polarity of different energy units in the same energy unit module are switched from the connected state to the disconnected state, that is, the two energy units in the same energy unit module are connected in series, and the series voltage is 2nV.

That is, when the electric tool with a working voltage of 2nV uses the electric energy storage device, the medium voltage plug cooperates with the control unit in the module to switch the two energy units in the same energy unit module from a parallel connection state to a series connection, and the two energy unit modules are maintained in a parallel connection state through the inter-module control unit. The connection circuit diagram of the four energy units is shown in Figure 9. That is, the two energy units in the same energy unit module are connected in series, and the two energy unit modules are connected in parallel to output a medium voltage of 2nV to the electric tool.

Referring to Figures 10 to 13, the electric tool with a working voltage of 4nV has a high-voltage plug 70b, which is provided with a first switching part plugged with the control part within the module, a second switching part plugged with the control part between modules, and a connecting piece 71b connected to two voltage output terminals 301b and 302b respectively. The first switching part includes a first insulating part 52b and a first conductive part 62b, and the second switching part includes a second insulating part 53b and a second conductive part 63b.

When the high-voltage plug is plugged into the socket, the first insulating part 52b contacts the two contact parts of the normally closed switches 41b and 42b in the control part inside the module, and the first conductive part 62b contacts the two contact parts of the normally open switch 30b in the control part inside the module, so that the electrodes with opposite polarities of different energy units in the same energy unit module are switched from the disconnected state to the connected state, and the electrodes with the same polarity of different energy units in the same energy unit module are switched from the connected state to the disconnected state, that is, the two energy units in the same energy unit module are connected in series, and the series voltage is 2nV.

The second insulating part 53b contacts the two contact parts of the normally closed switches 43b and 44b in the inter-module control part, and the second conductive part 63b contacts the two contact parts of the normally open switch 31b in the inter-module control part, so that the electrodes with opposite polarities of different energy unit modules are switched from the disconnected state to the connected state, and the electrodes with the same polarity of different energy unit modules are switched from the connected state to the disconnected state. Two energy unit modules are connected in series, and the circuit diagram of the four energy units is shown in Figure 13.

That is, when an electric tool with an operating voltage of 4nV uses the electric energy storage device, the first switching part of the high-voltage plug cooperates with the control part inside the module to switch the connection between different energy units in the same energy unit module from parallel to series, and the second switching part of the high-voltage plug cooperates with the inter-module control part to switch the connection between different energy unit modules from parallel to series, so that the four energy units are connected in series to output a high voltage of 4nV to the electric tool.

It can be seen that when N is four and the voltage of a single energy unit is nV, the energy storage device can provide three voltages, namely low voltage nV, high voltage 4nV and medium voltage 2nV.

Please refer to Figures 14 to 20. In the third embodiment, the electric energy storage device includes six energy units with the same voltage, all of which are nV; the six energy units are evenly divided into two energy unit modules, namely, energy unit module 10f and energy unit module 20f. The socket of the electric energy storage device includes a module control unit that connects three energy units in the same energy unit module in parallel and four voltage output terminals that are respectively connected to the positive and negative electrodes of the two energy unit modules, namely, voltage output terminals 101f and 102f that are respectively connected to the positive and negative electrodes of the energy unit module 10f and voltage output terminals 201f and 202f that are respectively connected to the positive and negative electrodes of the energy unit module 20f.

Specifically, the control unit in the module includes eight normally closed switches and four normally open switches, wherein each energy unit module is provided with two normally open switches 31f, 32f and four normally closed switches 41f, 42f, 43f, 44f to connect the three energy units in the same energy unit module in parallel; in this embodiment, the normally open switches 31f, 32f, and the normally closed switches 41f, 42f, 43f, 44f all include two contact portions (unnumbered) connected to the electrodes of the energy units, and the two contact portions of the normally closed switches 41f, 42f, 43f, 44f are respectively connected to electrodes of the same polarity of different energy units, such as: the two contact portions of the normally closed switches 41f, 42f are respectively connected to the negative poles of different energy units, and the two contact portions of the normally closed switches 43f, 44f are respectively connected to the positive poles of different energy units; the two contact portions of the normally open switches 31f, 32f are respectively connected to electrodes of opposite polarity of different energy units to realize the parallel connection of the three energy units in the same energy unit module.

Please refer to FIG. 15 and FIG. 14 , the electric tool with a working voltage of nV has a low-voltage plug, and the low-voltage plug has two connecting pieces connecting electrodes of the same polarity of two energy unit modules. When the low-voltage plug is plugged into the socket, one connecting piece connects the voltage output terminals 101f and 201f corresponding to the positive poles of the two energy unit modules, and the other connecting piece connects the voltage output terminals 102f and 202f corresponding to the negative poles of the two energy unit modules, so that the voltage output terminals of the same polarity among the four voltage output terminals are connected in parallel, and the two energy unit modules 10f and 20f are connected in parallel. The connection circuit diagram of the six energy units is shown in FIG. 15 .

That is, when an electric tool with a working voltage of nV uses the electric energy storage device, the two connecting pieces of the low-voltage plug control the two energy unit modules 10f and 20f to be connected in parallel, and the three energy units of the same energy unit module are maintained in parallel through the control part inside the module, so that the six energy units of the electric energy storage device are connected in parallel to output a low voltage of nV to the electric tool.

Please refer to FIG. 16 and FIG. 14 , the electric tool with a working voltage of 2nV has a first medium voltage plug, and the first medium voltage plug is provided with a connecting piece (not shown) for connecting two energy unit modules in series. When the electric tool with a working voltage of 2nV uses the electric energy storage device, the first medium voltage plug is plugged into the socket, and the connecting piece connects the voltage output terminals with different polarities of one group of different energy unit modules among the four voltage output terminals, such as connecting the positive electrode 101f of the energy unit module 10f with the negative electrode 202f of the energy unit module, or connecting the negative electrode 102f of the energy unit module 10f with the positive electrode 201f of the energy unit module, so that the two energy unit modules are connected in series, and the three energy units of the same energy unit module are kept in parallel connection through the control unit in the module. The circuit diagram of the connection of six energy units is shown in FIG. 16 , and the parallel voltage of the three energy units in the energy unit module is nV, and the two energy unit modules are connected in series to output the first medium voltage 2nV to the electric tool.

Please refer to Figures 17 to 18 and in combination with Figure 14, the electric tool with an operating voltage of 3nV has a second medium voltage plug, and the second medium voltage plug is provided with a first switching part that cooperates with the control part in the module and two connecting pieces (not shown) that connect two energy unit modules in parallel. The first switching part includes an insulating part 51f and a conductive part 61f. When the second medium voltage plug is plugged into the socket, the insulating part 51f is inserted between the two contact parts of the normally closed switches 41f, 42f, 43f, and 44f to insulate and separate the two contact parts, so that the electrodes with the same polarity in the same energy unit module are switched from the connected state to the disconnected state; the conductive part 61f contacts the two contact parts of the normally open switches 31f and 32f to conduct the electrodes with opposite polarities of different energy units in the same energy unit module, so that the electrodes with opposite polarities of different energy units in the same energy unit module are switched from the disconnected state to the connected state; that is, the three energy units in the same energy unit module are connected in series, and the voltage is 3nV. One connecting piece connects the voltage output terminals 101f and 201f corresponding to the positive poles of the two energy unit modules, and another connecting piece connects the voltage output terminals 102f and 202f corresponding to the negative poles of the two energy unit modules, so that the voltage output terminals with the same polarity among the four voltage output terminals are connected in parallel, the two energy unit modules 10f and 20f are connected in parallel, and the circuit diagram of the six energy units is shown in Figure 18.

That is, when an electric tool with an operating voltage of 3nV uses the electric energy storage device, the first switching part of the second medium voltage plug cooperates with the control part inside the module to switch the three energy units in the same energy module from parallel connection to series connection, and the two energy unit modules are connected in parallel through two connecting plates to output a second medium voltage of 3nV to the electric tool.

Referring to Figures 19 to 20 and in conjunction with Figure 14, the electric tool with an operating voltage of 6nV has a high-voltage plug, on which a first switching portion cooperating with the control portion in the module and a connecting piece (not shown) connecting two energy unit modules in series are provided. The first switching portion includes an insulating portion 52f and a conductive portion 62f. When the high-voltage plug is plugged into the socket, the insulating portion 52f is inserted between the two contact portions of the normally closed switches 41f, 42f, 43f, and 44f to insulate and separate the two contact portions, so that the electrodes with the same polarity in the same energy unit module are switched from the connected state to the disconnected state; the conductive portion 62f contacts the two contact portions of the normally open switches 31f and 32f to conduct the electrodes with opposite polarities in the same energy unit module, so that the electrodes with opposite polarities in the same energy unit module are switched from the disconnected state to the connected state; the three energy units in the same energy unit module are connected in series; the connecting piece connects the voltage output terminals with different polarities of one group of different energy unit modules among the four voltage output terminals, such as connecting the positive electrode 101f of the energy unit module 10f to the negative electrode 202f of the energy unit module, or connecting the negative electrode 102f of the energy unit module 10f to the positive electrode 201f of the energy unit module, so that the two energy unit modules are connected in series. The circuit diagram of the connection of six energy units is shown in Figure 20.

That is, when an electric tool with an operating voltage of 6nV uses the electric energy storage device, the first switching part of the high-voltage plug cooperates with the control part inside the module to switch the three energy units in the same energy module from parallel connection to series connection, with a voltage of 3nV; the two energy unit modules are connected in series through a connecting plate to output a high voltage of 6nV to the electric tool.

It can be seen that when N is six and the voltage of a single energy unit is nV, the energy storage device can provide four voltages, namely low voltage nV, high voltage 6nV, first medium voltage 2nV and second medium voltage 3nV.

It should be noted that the specific forms of the intra-module control unit and the inter-module control unit are not limited to the aforementioned normally open switch or normally closed switch, and all components that can achieve the same function are within the scope of this protection.

It should also be noted that, in the aforementioned embodiments 1 to 3, a normally open switch may be provided with a corresponding conductive part (first conductive part or second conductive part), or a conductive part plugged with multiple normally open switches may be formed in one piece, such as multiple normally open switches are stacked up and down, and multiple normally open switches can be turned on using one conductive part; similarly, a normally closed switch may be provided with an insulating part (second insulating part or second insulating part), or an insulating part plugged with multiple normally closed switches may be formed in one piece, such as multiple normally closed switches are stacked up and down, and multiple normally closed switches can be insulated and separated using one insulating part; the insulating part and the conductive part may also be provided in one piece, such as: one section is an insulating part made of insulating material, and one section is a conductive part made of conductive material. The structure of the conductive part and the insulating part is not limited here, and it is only necessary to ensure that the conductive part turns on the corresponding normally open switch, and the insulating part insulates and separates the corresponding normally closed switch.

In summary, the electric energy storage device of the present invention includes N energy units with the same voltage, and the N energy units are equally divided into M energy unit modules. Each energy unit module has an internal module control unit. In the initial state, the internal module control unit connects the N/M energy units in the same energy unit module in parallel. By using different plugs to plug into the electric energy storage device, the N energy units are connected in parallel, in series, or the energy units in the same module are connected in series or in parallel, and the energy unit modules are connected in series or in parallel to output one of at least three output voltages to the electric tool using the electric energy storage device. This arrangement increases the scope of application of the electric energy storage device and reduces the cost of use.

The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (5)

1. An electric energy storage device, characterized in that: it comprises N energy units with equal voltages, which can provide at least three output voltages; N is a composite number, the N energy units are equally divided into a number of energy unit modules, each of which has an internal module control unit; in an initial state, the internal module control unit connects the energy units in the same energy unit module in parallel, the positive and negative electrodes of each of the energy unit modules are correspondingly connected to a pair of voltage output terminals, the several energy unit modules are connected in series or in parallel by plugging several pairs of the voltage output terminals with docking plugs, and the energy unit modules are connected in series or in parallel to output one of the at least three output voltages to the electric tool using the electric energy storage device; The electric energy storage device further comprises an inter-module control unit disposed between the plurality of energy unit modules; in an initial state, the inter-module control unit connects the plurality of energy unit modules in parallel so that the plurality of energy units are connected in parallel; The N is four; the four energy units are equally divided into two energy unit modules, and the intra-module control unit and the inter-module control unit each include a normally open switch and two normally closed switches; the normally closed switch and the normally open switch each include two contact portions connected to the electrodes of the energy unit; the two contact portions of the two normally closed switches of the intra-module control unit are respectively connected to electrodes of the same polarity of different energy units, and control the connection or disconnection of electrodes of the same polarity of two energy units in the same energy unit module; the two contact portions of the normally open switch of the intra-module control unit are respectively connected to one group of electrodes of opposite polarity of different energy units, and control the disconnection or connection of electrodes of opposite polarity of different energy units in the same energy unit module, and the one normally open switch and the two normally closed switches of the intra-module control unit jointly control the two energy units in the same energy unit module to be in a parallel or series connection state; The two contact parts of the two normally closed switches of the inter-module control unit are respectively connected to electrodes with the same polarity of different energy unit modules, controlling the connection or disconnection of the electrodes with the same polarity of the two energy unit modules; the two contact parts of the normally open switch of the inter-module control unit are respectively connected to one group of electrodes with opposite polarity of different energy unit modules, controlling the disconnection or connection of electrodes with opposite polarity of different energy unit modules, and the one normally open switch and two normally closed switches of the inter-module control unit jointly control the two energy unit modules to be in a parallel or series connection state. 2. The electric energy storage device according to claim 1 is characterized in that: the electric energy storage device has two voltage output terminals connected correspondingly to the total positive and total negative electrodes of the plurality of energy unit modules connected in parallel or in series. 3. An electric energy storage device, characterized in that: it comprises N energy units with equal voltages, which can provide at least three output voltages; N is a composite number, and the N energy units are equally divided into a number of energy unit modules, each of which has an internal module control unit; in an initial state, the internal module control unit connects the energy units in the same energy unit module in parallel, and the positive and negative electrodes of each of the energy unit modules are correspondingly connected to a pair of voltage output terminals, and the energy unit modules are connected in series or in parallel by plugging a number of pairs of the voltage output terminals into docking plugs, and the energy unit modules are connected in series or in parallel to output one of the at least three output voltages to the electric tool using the electric energy storage device; Among them, the N is six; the six energy units are equally divided into two energy unit modules, and the control part in the module includes two normally open switches and four normally closed switches; the normally closed switch and the normally open switch each include two contact parts connected to the electrodes of the energy unit; the two contact parts of the four normally closed switches are respectively connected to the electrodes with the same polarity of different energy units, and control the connection or disconnection of the electrodes with the same polarity of different energy units in the same energy unit module; the two contact parts of the two normally open switches are respectively connected to the electrodes with opposite polarities of different energy units, and control the disconnection or connection of the electrodes with opposite polarities of different energy units in the same energy unit module, and the two normally open switches and the four normally closed switches of the control part in the module jointly control the three energy units in the same energy unit module to be in a parallel or series connection state. 4. The electric energy storage device according to claim 3 is characterized in that: in the initial state, the two normally open switches and the four normally closed switches jointly control the three energy units in the same energy unit module to be connected in parallel. 5. An electric tool, characterized in that the electric tool uses the electric energy storage device described in any one of claims 1 to 4.