A battery pack and power tool

Abstract

The application discloses a battery pack and an electric tool, the battery pack comprising a main battery module and at least one voltage regulating module, the main battery module comprising a first positive electrode end and a first negative electrode end, and being connected to a battery pack positive electrode and a battery pack negative electrode respectively, and supplying power to an external device through the battery pack positive electrode and the battery pack negative electrode; the at least one voltage regulating module being connected between the main battery module and the external device; the voltage regulating module comprising a battery cell, a first output end, a second output end and an intermediate connection end; the intermediate connection end of the voltage regulating module being electrically connected to the first positive electrode end or the first negative electrode end, one of the first output end and the second output end being electrically connected to the battery pack positive electrode, and the other being electrically connected to the battery pack negative electrode; the voltage regulating module changing the voltage superposition relationship between the main battery module and the battery cell by controlling the on-off state of the first output end and the second output end. The technical scheme provided by the application improves the versatility, adaptability and use convenience of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of voltage conversion technology, and more particularly to a battery pack and a power tool. Background Technology

[0002] For power tools powered by lithium batteries, since there is no unified standard for power supply voltage among manufacturers and brands, the power supply voltage of various types of power tools is different. This means that power tools with different power supply voltages need to be compatible with different battery packs in order to work normally after receiving the power supply voltage.

[0003] Currently, more and more power tools are switching to more portable and efficient battery power; however, battery packs typically only provide a single power supply voltage, making them incompatible with the various types of power tool heads. Therefore, how to provide a battery pack with an adjustable power supply voltage to adapt to a variety of power tools has become a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This invention provides a battery pack and a power tool. The battery pack can output a variety of different voltage signals to adapt to external devices with different power supply voltages, thereby improving the power supply adaptability and reliability of the battery pack.

[0005] In a first aspect, the present invention provides a battery pack, comprising: The main battery module includes a first positive terminal and a first negative terminal; and is respectively connected to the positive terminal and the negative terminal of the battery pack, and supplies power to external devices through the positive terminal and the negative terminal of the battery pack; At least one voltage regulating module is connected between the main battery module and the external device; the voltage regulating module includes a battery cell, a first output terminal, a second output terminal, and an intermediate connection terminal; the intermediate connection terminal of the voltage regulating module is electrically connected to either the first positive terminal or the first negative terminal, and one of the first output terminal and the second output terminal is electrically connected to the positive terminal of the battery pack, and the other is electrically connected to the negative terminal of the battery pack; the voltage regulating module changes the voltage superposition relationship between the main battery module and the battery cell by controlling the on / off state of the first output terminal and the second output terminal.

[0006] Optionally, when the number of voltage regulating modules is two or more, in two adjacent voltage regulating modules, the intermediate connection terminal of one voltage regulating module is electrically connected to the first output terminal of the other voltage regulating module; the second output terminal of each voltage regulating module is electrically connected.

[0007] Optionally, the voltage regulating module further includes: a first switch module, a second switch module, and a third switch module; The positive terminal of the battery cell is electrically connected to the first output terminal, the negative terminal of the battery cell is electrically connected to the second output terminal through the third switch module, the negative terminal of the battery cell is also electrically connected to the intermediate connection terminal through the second switch module, and the intermediate connection terminal is electrically connected to the positive terminal of the battery cell through the first switch module.

[0008] Optionally, the battery pack also includes: The control module is electrically connected to the control terminals of the first switch module, the second switch module, and the third switch module in each of the voltage regulating modules; the control module is used to control the on / off state of the first switch module, the on / off state of the second switch module, and the on / off state of the third switch module.

[0009] Optionally, the control module includes: a main control unit and a drive unit that corresponds one-to-one with each of the switch modules; The main control unit is used to provide control signals to each of the drive units, and the drive units are used to provide conduction control signals or disconnection control signals to the switch module according to the control signals.

[0010] Optionally, the main control unit includes a voltage switching level input terminal; The main control unit is used to provide the control signal to each of the drive units according to the voltage switching level provided by the voltage switching level input terminal.

[0011] Optionally, when the battery pack is electrically connected to an external device with a different power supply voltage, the voltage switching input terminal provides different voltage switching levels.

[0012] Optionally, the driving unit includes a boost converter chip.

[0013] Optionally, the first switching module includes a first MOSFET and a second MOSFET connected in reverse series, the second switching module includes a third MOSFET and a fourth MOSFET connected in reverse series, and the third switching module includes a fifth MOSFET and a sixth MOSFET connected in reverse series.

[0014] Optionally, the battery pack also includes: The overcurrent protection unit is electrically connected in the series circuit between the battery pack and the external device.

[0015] In a second aspect, the present invention provides an electric tool including the battery pack described in the first aspect.

[0016] The technical solution provided by this invention changes the voltage superposition relationship between the main battery module and the battery cells by controlling the on / off state of the first and second output terminals of the voltage regulating module. This allows a single battery pack to output multiple different levels of power supply voltage to adapt to various external devices with different power supply voltage requirements. Thus, a single battery pack can meet the power supply needs of multiple electrical devices, eliminating the need for multiple battery packs for different devices, significantly improving the battery pack's versatility, adaptability, and ease of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another battery pack structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of another battery pack provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of another battery pack provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of another battery pack structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of a battery pack provided in an embodiment of the present invention. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present invention, such as... Figure 1As shown, the battery pack 100 includes a main battery module 10 and at least one voltage regulating module 20. The main battery module 10 includes a first positive terminal B+ and a first negative terminal B-, which are respectively connected to the positive terminal V+ and the negative terminal V- of the battery pack, and supply power to external devices through the positive terminal V+ and the negative terminal V- of the battery pack. The voltage regulating module 20 is connected between the main battery module 10 and the external device. The voltage regulating module 20 includes a battery cell 34, a first output terminal V1, a second output terminal V2, and an intermediate connection terminal V3. The intermediate connection terminal V3 of the voltage regulating module 20 is electrically connected to either the first positive terminal B+ or the first negative terminal B-. One of the first output terminal V1 and the second output terminal V2 is electrically connected to the positive terminal V+ of the battery pack, and the other is electrically connected to the negative terminal V- of the battery pack. The voltage regulating module 20 changes the voltage superposition relationship between the main battery module 20 and the battery cell 32 by controlling the on / off state of the first output terminal V1 and the second output terminal V2.

[0020] The voltage regulating module 20 electrically connected to the main battery module 10 is the first voltage regulating module 21. The intermediate connection terminal V3 of the first voltage regulating module 21 is electrically connected to either the first positive terminal B+ or the first negative terminal B-. When the intermediate connection terminal V3 of the first voltage regulating module 21 is electrically connected to the first positive terminal B+, the first output terminal V1 of the voltage regulating module 20 is electrically connected to the positive terminal V+ of the battery pack, and the second output terminal V2 of the voltage regulating module 20 is electrically connected to the negative terminal V- of the battery pack. Correspondingly, when the intermediate connection terminal V3 of the first voltage regulating module 21 is electrically connected to the first negative terminal B-, the first output terminal V1 of the voltage regulating module 20 is electrically connected to the negative terminal V- of the battery pack, and the second output terminal V2 of the voltage regulating module 20 is electrically connected to the positive terminal V+ of the battery pack. When there are two or more voltage regulating modules 20, in two adjacent voltage regulating modules 20, the intermediate connection terminal V3 of one voltage regulating module 20 is electrically connected to the first output terminal V1 of the other voltage regulating module 20, and the second output terminals V2 of each are electrically connected.

[0021] In this embodiment, the main battery module 10 can supply power to the external device solely through the positive terminal V+ and the negative terminal V- of the battery pack, or the main battery module 10 and at least one voltage regulating module 20 can supply power to the external device through the positive terminal V+ and the negative terminal V- of the battery pack. One of these two power supply methods can be selected to provide power signals to the external device according to actual needs. To enable the battery pack to output multiple power supply voltages, this embodiment of the invention uses the main battery module 10 and at least one voltage regulating module 20 supplying power to the external device through the positive terminal V+ and the negative terminal V- of the battery pack as an example for illustration.

[0022] The main battery module 10 is formed by multiple battery cells connected in series and / or in parallel, for example Figure 1The diagram shows that the main battery module 10 consists of five cells connected in series. The voltage of each cell can be set according to actual needs. For example, the voltage range of the cells is 2.7V to 4.2V, and the voltage range provided by the main battery module 10 is 13.5V to 21V. Other voltage ranges are also possible, but no specific limitation is made here.

[0023] The voltage regulating module 20 may include a battery module formed by multiple battery cells connected in series and / or in parallel, as well as other switching modules, etc., which can be set according to actual needs. After the voltage regulating module 20 is electrically connected to the main battery module 10, it can regulate the on / off state of the first output terminal V1 and the second output terminal V2 in each voltage regulating module 20, so as to regulate the electrical connection relationship between the main battery module 10 and the battery cells 34 in each voltage regulating module 20, thereby changing the voltage superposition relationship between the main battery module 10 and each battery cell 34, so that the main battery module 10 and each battery cell 34 can output different voltage signals after superposition, so that the battery pack 100 can output different voltage signals to meet the power supply of different devices. The battery pack 100 realizes multi-voltage power supply, improving the power supply adaptability and reliability of the battery pack 100.

[0024] The number of voltage regulating modules 20 can be set according to actual needs. The battery pack 100 may include n voltage regulating modules 20, namely the first voltage regulating module 21, the second voltage regulating module 22, ..., the nth voltage regulating module 2n. The battery unit in the first voltage regulating module 21 is the first battery unit 341, the battery unit in the second voltage regulating module 22 is the second battery unit 342, ..., the battery unit in the nth voltage regulating module 2n is the nth battery unit 34n, where n is a positive integer greater than or equal to 1.

[0025] The positive terminal V+ and negative terminal V- of the battery pack can serve as the positive and negative output terminals of the battery pack 100, respectively. After the positive terminal V+ and negative terminal V- are electrically connected to the power supply terminal of an external device, the battery pack 100 can provide power to the external device through these terminals to supply the necessary operating voltage. The external device includes power tool heads such as leather brush heads, bristle brush heads, saw blades, or grinding discs; specific external devices can be selected based on actual needs, and no specific limitations are made here.

[0026] Specifically, by configuring the battery pack 100 to include multiple voltage regulating modules 20, the on / off states of the first output terminal V+ and the second output terminal V- can be controlled by adjusting the internal connection method of the voltage regulating module 20, so that different voltage outputs can be achieved after the voltage regulating module 20 is electrically connected to the main battery module 10. The connection methods in each voltage regulating module 20 can be the same or different to achieve multiple voltage outputs. The voltage signals between the first output terminal V1 and the second output terminal V2 of each voltage regulating module 20 can be the same or different to achieve multiple power supply voltage outputs to meet the power supply needs of different external devices, enabling the battery pack 100 to achieve multi-voltage power supply and improving the power supply adaptability and reliability of the battery pack 100.

[0027] The technical solution provided by this invention changes the voltage superposition relationship between the main battery module and the battery cells by controlling the on / off state of the first and second output terminals of the voltage regulating module. This allows a single battery pack to output multiple different levels of power supply voltage to adapt to various external devices with different power supply voltage requirements. Thus, a single battery pack can meet the power supply needs of multiple electrical devices, eliminating the need for multiple battery packs for different devices, significantly improving the battery pack's versatility, adaptability, and ease of use.

[0028] Optional, Figure 2 This is a schematic diagram of another battery pack structure provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the voltage regulating module 20 also includes a first switch module 31, a second switch module 32, and a third switch module 33; the positive terminal of the battery unit 34 is electrically connected to the first output terminal V1, the negative terminal of the battery unit 34 is electrically connected to the second output terminal V2 through the third switch module 33, the negative terminal of the battery unit 34 is also electrically connected to the intermediate connection terminal V3 through the second switch module 32, and the intermediate connection terminal V3 is electrically connected to the positive terminal of the battery unit 34 through the first switch module 31.

[0029] To facilitate the explanation of the structure of the voltage regulating module 20, Figure 2 The diagram only shows the structure of the battery pack 100 including one voltage regulating module 20. When the battery pack 100 includes multiple voltage regulating modules 20, please refer to... Figure 2 and Figure 1 The following description of the voltage regulating module 20 leads to the overall structural diagram and working principle of the battery pack 100.

[0030] The battery cell 34 can be formed by multiple cells connected in series and / or in parallel, for example... Figure 2 The diagram shows that the battery unit 34 consists of five cells connected in series. The voltage of each cell can be set according to actual needs. For example, the voltage range of the cells is 2.7V to 4.2V, and the voltage range provided by the battery unit 34 is 13.5V to 21V. Other voltage ranges are also possible, but no specific limitation is made here.

[0031] Specifically, when the battery pack 100 includes a voltage regulating module 20 (first voltage regulating module 21), the first output terminal V1 and the second output terminal V2 of the first voltage regulating module 21 are the positive terminal V+ and the negative terminal V- of the battery pack 100. By adjusting the on / off states of the first switch module 31, the second switch module 32, and the third switch module 33 in the voltage regulating module 20, different electrical connection structures are achieved inside the voltage regulating module 20, thereby achieving different output voltages for the first output terminal V1 and the second output terminal V2. When the first switch module 31 and the third switch module 33 are in the on state, and the second switch module 32 is in the off state, the main battery module 10 and the battery cell 34 are connected in parallel. At this time, the output voltages of the positive output terminal V+ and the negative output terminal V- of the battery pack 100 are the parallel voltages after the main battery module 10 and the battery cell 34 are connected in parallel. For example, if the voltages of the main battery module 10 and the battery cell 34 are both 21V, then the parallel voltage output after parallel connection is also 21V. When the first switch module 31 and the third switch module 33 are in the off state, and the second switch module 32 is in the on state, the main battery module 10 and the battery unit 34 are connected in series. At this time, the output voltage of the positive output terminal V+ and the negative output terminal V- of the battery pack 100 is the series voltage of the main battery module 10 and the battery unit 34. For example, if the voltage of the main battery module 10 and the battery unit 34 are both 21V, then the series voltage output is 42V. Thus, by setting the voltage regulating module 20 to include the battery unit 34, the first switch module 31, the second switch module 32 and the third switch module 33, and by adjusting the on / off state of the first switch module 31, the second switch module 32 and the third switch module 33, the battery pack 100 can achieve different output voltages.

[0032] It should be noted that the on / off states of the first switch module 31, the second switch module 32, and the third switch module 33 can be controlled by external control devices, or a control module capable of controlling the on / off states of the first switch module 31, the second switch module 32, and the third switch module 33 can be provided within the battery pack 100, depending on actual needs. In an optional embodiment, Figure 3 This is a schematic diagram of another battery pack provided in an embodiment of the present invention, such as... Figure 3 As shown, the battery pack 100 also includes a control module 40, which is electrically connected to the control terminals of the first switch module 31, the second switch module 32 and the third switch module 33 in each voltage regulating module 20. The control module 40 is used to control the on / off state of the first switch module 31, the second switch module 32 and the third switch module 33.

[0033] Specifically, the control module 40 can simultaneously provide on control signals to the first switch module 31 and the third switch module 33 in the same voltage regulating module 20, and provide off control signals to the second switch module 32 in the same voltage regulating module 20, to control the first switch module 31 and the third switch module 33 to be in the on state and the second switch module 32 to be in the off state. Correspondingly, the control module 40 can also simultaneously provide off control signals to the first switch module 31 and the third switch module 33 in the same voltage regulating module 20, and provide on control signals to the second switch module 32 in the same voltage regulating module 20, to control the first switch module 31 and the third switch module 33 to be in the off state and the second switch module 32 to be in the on state. Thus, by including the control module 40 in the battery pack 100, the on / off state of each switch module can be actively controlled by the control module 40, achieving automated control, reducing the need for external control equipment, reducing control steps and processes, and improving ease of use.

[0034] Optional, Figure 4 This is a schematic diagram of another battery pack provided in an embodiment of the present invention, such as... Figure 4 As shown, the control module 40 includes a main control unit 41 and a drive unit 42 corresponding to each switch module. The main control unit 41 is used to provide control signals to each drive unit 42, and the drive unit 42 is used to provide conduction control signals or disconnection control signals to the switch modules according to the control signals.

[0035] The main control unit 41 includes a microcontroller unit (MCU), and the drive unit 42 includes a voltage converter. These can be configured according to actual needs, and no specific limitations are made here.

[0036] The number of drive units 42 is the same as the number of switch modules. When the battery pack 100 includes n voltage regulating modules 20, and each voltage regulating module 20 includes 3 switch modules, the number of drive units 42 is 3n. Figure 4 The diagram shows that the battery pack 100 includes only a first voltage regulating module 21, a first driving unit 421 electrically connected to the first switching module 31 in the first voltage regulating module 21, a second driving unit 422 electrically connected to the second switching module 32 in the first voltage regulating module 21, and a third driving unit 423 electrically connected to the third switching module 33 in the first voltage regulating module 21.

[0037] Specifically, the main control unit 41 provides control signals to each drive unit 42. When the control signal is a first control signal that controls the switch module to be in the on state, the drive unit 42 provides an on control signal to the switch module according to the first control signal. When the control signal is a second control signal that controls the switch module to be in the off state, the drive unit 42 provides an off control signal to the switch module according to the second control signal. The first control signal and the second control signal are different, and the on control signal and the off control signal are different. For example, the first control signal is 3.3V, the second control signal is 1V, the on control signal is 12V, and the off control signal is 8V. These can be set according to actual needs and are not specifically limited here. In this way, by setting the drive unit 42, the drive unit 42 can output an on control signal that controls the switch module to be in the on state or an off control signal that controls the switch module to be in the off state according to the control signal provided by the main control unit 41, thereby accurately controlling the on / off state of the switch module and improving control reliability.

[0038] Optional, Figure 5 This is a schematic diagram of another battery pack structure provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the main control unit 41 includes a voltage switching gear input terminal U0; the main control unit 41 is used to provide control signals to each drive unit 42 according to the voltage switching gear provided by the voltage switching gear input terminal U0.

[0039] The voltage switching input terminal U0 includes a button or knob for adjusting the voltage level, which can be set according to actual needs; no specific limitations are made here.

[0040] Specifically, the number of voltage switching levels that the voltage switching input terminal U0 can provide is related to the number of voltage regulating modules 20 in the battery pack 100. When the battery pack 100 includes one voltage regulating module 20, the voltage switching input terminal U0 can provide two voltage switching levels; when the battery pack 100 includes n voltage regulating modules 20, the voltage switching input terminal U0 can provide 2 n There are several voltage switching levels. Each voltage switching level corresponds to a connection structure in each voltage regulating module 20 of the battery pack 100. The main control unit 41 can control the on / off state of the switching modules in each voltage regulating module 20 corresponding to the current voltage switching level according to the current voltage switching level provided by the voltage switching level input terminal U0, so as to realize the voltage output corresponding to the current voltage switching level.

[0041] Optionally, when the battery pack 100 is electrically connected to an external device with a different supply voltage, the voltage switching input terminal U0 provides different voltage switching levels.

[0042] Specifically, the voltage switching input U0 can be manually controlled. When the operator using the battery pack 100 determines the power supply voltage of the external device, they can adjust the voltage switching position of the voltage switching input U0 so that the battery pack 100 can output a power supply voltage that matches the external device through the first output V1 and the second output V2 of one of the voltage regulating modules 20. When the external device is electrically connected to the battery pack 100, the power supply voltage provided by the battery pack 100 can maintain the normal operation of the external device.

[0043] For example, refer to Figure 5 When the battery pack 100 includes only one voltage regulating module 20, the power supply voltage required by the external device is the first voltage signal obtained by connecting the main battery module 10 and the battery unit 34 in parallel. The voltage switching input terminal U0 provides the first voltage switching position. Based on the first voltage switching position, the main control unit 41 controls the first switch module 31 and the third switch module 33 to be in the on state and controls the second switch module 32 to be in the off state via the drive unit 42. Conversely, when the power supply voltage required by the external device is the second voltage signal obtained by connecting the main battery module 10 and the battery unit 34 in series, the voltage switching input terminal U0 provides the second voltage switching position. Based on the second voltage switching position, the main control unit 41 controls the first switch module 31 and the third switch module 33 to be in the off state and controls the second switch module 32 to be in the on state via the drive unit 42.

[0044] Optionally, the drive unit 42 includes a boost converter chip. Thus, the drive unit 42 can boost the reference signal in the drive unit 42 according to the control signal provided by the main control unit 41, and then output the turn-on or turn-off control signal required by the switching module, improving the drive reliability of the drive unit 42.

[0045] Optional, Figure 6 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present invention, such as... Figure 6 As shown, the first switching module 31 includes a first MOSFET Q1 and a second MOSFET Q2 connected in reverse series, the second switching module 32 includes a third MOSFET Q3 and a fourth MOSFET Q4 connected in reverse series, and the third switching module 33 includes a fifth MOSFET Q5 and a sixth MOSFET Q6 connected in reverse series.

[0046] Among them, the first MOSFET Q1, the second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, the fifth MOSFET Q5, and the sixth MOSFET Q6 can be either N-type or P-type MOSFETs, and can be set according to actual needs. Figure 5The diagram shows the case where the first MOSFET Q1, the second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, the fifth MOSFET Q5, and the sixth MOSFET Q6 are all N-type MOSFETs.

[0047] Specifically, the first terminal of the first MOSFET Q1 is electrically connected to the intermediate connection terminal V3; the second terminal of the first MOSFET Q1 is electrically connected to the first terminal of the second MOSFET Q2; the second terminal of the second MOSFET Q2 is electrically connected to the first output terminal V1; and the control terminals of both the first and second MOSFETs Q1 and Q2 are electrically connected to the drive unit 42. The first terminal of the third MOSFET Q3 is electrically connected to the intermediate connection terminal V3; the second terminal of the third MOSFET Q3 is electrically connected to the first terminal of the fourth MOSFET Q4; the second terminal of the fourth MOSFET Q4 is electrically connected to the negative terminal of the battery cell 34; and the control terminals of both the third and fourth MOSFETs Q3 and Q4 are electrically connected to the drive unit 42. The first terminal of the fifth MOSFET Q5 is electrically connected to the negative terminal of the battery cell 34; the second terminal of the fifth MOSFET Q5 is electrically connected to the first terminal of the sixth MOSFET Q6; the second terminal of the sixth MOSFET Q6 is electrically connected to the second output terminal V2; and the control terminals of both the fifth and sixth MOSFETs Q5 and Q6 are electrically connected to the drive unit 42. By setting the two MOSFETs in each switching module to be connected in reverse series, the reverse current flow between the two ends of the switching module can be effectively prevented when the two MOSFETs in the switching module are in the off state, thus ensuring the controllability of the circuit state inside the battery pack 100 and protecting the battery pack 100.

[0048] Optional, see reference Figure 6 The voltage regulating module 20 also includes an overcurrent protection unit 35, which is electrically connected to the series circuit between the battery pack 100 and the external device.

[0049] The overcurrent protection unit 35 includes devices such as fuses FU, which can be configured according to actual needs.

[0050] Specifically, when the battery pack 100 includes a voltage regulating module 20, an overcurrent protection unit 35 can be connected in series between the first output terminal V1 of the voltage regulating module 20 and the positive output terminal V+ that provides a positive signal to the external device. When the battery pack 100 supplies power to the external device, the overcurrent protection unit 35 can detect the current signal flowing through the external device and the battery pack 100 in real time, so as to disconnect the electrical connection between the battery pack 100 and the external device when the current signal exceeds the threshold, thereby improving the safety of use.

[0051] Based on the same inventive concept, the present invention also provides an electric tool, including a battery pack 100 provided in any embodiment of the present invention. The battery pack 100 is compatible with various working heads. The working heads include leather brush heads, bristle brush heads, saw blades, or grinding discs, etc., and specific working heads can be selected according to actual needs; no specific limitations are made here. This electric tool includes the battery pack provided in any embodiment of the present invention. Therefore, this electric tool possesses the technical features of the battery pack provided in the embodiments of the present invention and can achieve the beneficial effects of the battery pack provided in the embodiments of the present invention. Similarities can be referred to the above description of the battery pack provided in the embodiments of the present invention, and will not be repeated here.

[0052] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A battery pack, characterized in that, include: The main battery module includes a first positive terminal and a first negative terminal, which are respectively connected to the positive terminal and the negative terminal of the battery pack, and supply power to external devices through the positive terminal and the negative terminal of the battery pack; At least one voltage regulating module is connected between the main battery module and the external device; the voltage regulating module includes a battery cell, a first output terminal, a second output terminal, and an intermediate connection terminal; the intermediate connection terminal of the voltage regulating module is electrically connected to either the first positive terminal or the first negative terminal, and one of the first output terminal and the second output terminal is electrically connected to the positive terminal of the battery pack, and the other is electrically connected to the negative terminal of the battery pack; the voltage regulating module changes the voltage superposition relationship between the main battery module and the battery cell by controlling the on / off state of the first output terminal and the second output terminal.

2. The battery pack according to claim 1, characterized in that, When there are two or more voltage regulating modules, in two adjacent voltage regulating modules, the intermediate connection terminal of one voltage regulating module is electrically connected to the first output terminal of the other voltage regulating module; the second output terminal of each voltage regulating module is electrically connected.

3. The battery pack according to claim 1, characterized in that, The voltage regulating module further includes: a first switch module, a second switch module, and a third switch module; The positive terminal of the battery cell is electrically connected to the first output terminal, the negative terminal of the battery cell is electrically connected to the second output terminal through the third switch module, the negative terminal of the battery cell is also electrically connected to the intermediate connection terminal through the second switch module, and the intermediate connection terminal is electrically connected to the positive terminal of the battery cell through the first switch module.

4. The battery pack according to claim 3, characterized in that, Also includes: The control module is electrically connected to the control terminals of the first switch module, the second switch module, and the third switch module in each of the voltage regulating modules; the control module is used to control the on / off state of the first switch module, the on / off state of the second switch module, and the on / off state of the third switch module.

5. The battery pack according to claim 4, characterized in that, The control module includes: a main control unit and a drive unit that corresponds to each of the switch modules; The main control unit is used to provide control signals to each of the drive units, and the drive units are used to provide conduction control signals or disconnection control signals to the switch module according to the control signals.

6. The battery pack according to claim 5, characterized in that, The main control unit includes a voltage switching level input terminal; The main control unit is used to provide the control signal to each of the drive units according to the voltage switching level provided by the voltage switching level input terminal.

7. The battery pack according to claim 6, characterized in that, When the battery pack is electrically connected to an external device with a different power supply voltage, the voltage switching level provided by the voltage switching level input terminal is different.

8. The battery pack according to claim 5, characterized in that, The driving unit includes a boost converter chip.

9. The battery pack according to claim 3, characterized in that, The first switching module includes a first MOSFET and a second MOSFET connected in reverse series; the second switching module includes a third MOSFET and a fourth MOSFET connected in reverse series; and the third switching module includes a fifth MOSFET and a sixth MOSFET connected in reverse series.

10. The battery pack according to claim 1, characterized in that, Also includes: The overcurrent protection unit is electrically connected in the series circuit between the battery pack and the external device.

11. A power tool, characterized in that, include: The battery pack according to any one of claims 1 to 10.

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