Power tool and battery pack

Abstract

A power tool and a battery pack. The battery pack comprises: a housing; a power tool interface, configured to be connected to the power tool, the power tool interface comprising a terminal assembly; and a battery cell module, accommodated in the housing and electrically connected to the terminal assembly, the battery cell module at least comprising a plurality of batter cell units, and the continuous discharge power of each battery cell unit being greater than or equal to 300 W.

Description

Power tools and battery packs

[0001] This application claims priority to Chinese patent application number 202310930017.6 filed with the China Patent Office on July 26, 2023, priority to Chinese patent application number 202410865070.7 filed with the China Patent Office on June 28, 2024, priority to Chinese patent application number 202410868943.X filed with the China Patent Office on June 28, 2024, priority to Chinese patent application number 202410873073.5 filed with the China Patent Office on June 28, 2024, and priority to Chinese patent application number 202410869167.5 filed with the China Patent Office on June 28, 2024. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electric tools, for example, to an electric tool and a battery pack. Background Art

[0003] With the advancement of battery technology, power tools are gradually replacing engine tools. To ensure the best performance of cordless power tools, battery packs are also required to have higher output characteristics. For example, garden tools require battery packs with longer battery life, handheld power tools require battery packs with higher energy density, and various types of power tools require battery packs with higher continuous discharge power.

[0004] This section provides background information related to the present application which is not necessarily prior art.

[0005] Summary of the Invention

[0006] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a battery pack with better output performance and a power tool using the battery pack.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] A battery pack for powering an electric tool comprises: a housing; an electric tool interface configured to be connected to the electric tool, the electric tool interface comprising a terminal assembly; a battery cell module housed in the housing and electrically connected to the terminal assembly, the battery cell module comprising at least a plurality of battery cell units; wherein the continuous discharge power of the battery cell units is greater than or equal to 300W.

[0009] In some embodiments, the instantaneous discharge power of the battery cell is greater than or equal to 550W.

[0010] In some embodiments, the power density of the battery pack is greater than or equal to 1500 W / kg.

[0011] In some embodiments, the battery cell unit is a full-tab battery.

[0012] In some embodiments, the terminal assembly includes a first positive terminal, a second positive terminal, a negative terminal, and a communication terminal.

[0013] In some embodiments, the battery pack is further configured to be detachably mounted to a riding vehicle to power the riding vehicle.

[0014] In some embodiments, the battery pack is further configured to be detachably mounted to a mobile power supply to at least supply power to the mobile power supply.

[0015] In some embodiments, the minimum distance between every two adjacent battery cell units in the plurality of battery cell units is greater than or equal to 2 mm.

[0016] A battery pack for powering an electric tool, comprising: a shell; an electric tool interface configured to be connected to the electric tool, the electric tool interface including a terminal assembly; a battery cell module accommodated in the shell and electrically connected to the terminal assembly, the battery cell module including at least one battery cell unit; wherein the maximum discharge rate of the battery pack is greater than or equal to 20C and less than or equal to 50C.

[0017] In some embodiments, at least one of the battery cells is a full-tab battery.

[0018] In some embodiments, the resistance of at least one of the battery cells is less than or equal to 10 mΩ.

[0019] In some embodiments, the energy density of at least one of the battery cells is greater than or equal to 600Wh / L.

[0020] In some embodiments, the charging rate of the battery pack is greater than or equal to 4C and less than or equal to 10C.

[0021] A battery pack comprises: a shell; an interface configured to be connected to an electrical device, the interface comprising a terminal assembly; a battery cell module accommodated in the shell and electrically connected to the terminal assembly, the battery cell module comprising a plurality of battery cell units; wherein, when the remaining power of the battery pack is greater than or equal to 50% and is discharged to the electrical device at a discharge rate greater than or equal to 2C at a preset temperature, the voltage drop of the battery cell unit is less than or equal to 100mV.

[0022] In some embodiments, the battery cell is a cylindrical battery.

[0023] In some embodiments, the battery cell unit is a full-tab battery.

[0024] In some embodiments, the power density of the battery pack is greater than or equal to 1500 W / kg.

[0025] In some embodiments, the preset temperature range is -20°C to 60°C.

[0026] A handheld power tool comprises: a housing; a working piece; a motor, disposed within the housing and configured to drive the working piece; and a battery pack, detachably mounted to the housing and configured to power the motor; wherein the battery pack weighs less than or equal to 4 kg and is capable of continuously providing the motor with a power of greater than or equal to 6 kW.

[0027] In some embodiments, the battery pack includes a plurality of battery cells; at least one of the battery cells is a full-tab battery.

[0028] In some embodiments, the handheld power tool is a garden tool.

[0029] In some embodiments, the handheld power tool is a chainsaw.

[0030] In some embodiments, the battery cell is a cylindrical battery.

[0031] In some embodiments, the resistance of at least one of the battery cells is less than or equal to 10 mΩ.

[0032] A battery pack comprises: a shell; an interface configured to be detachably connected to an electrical device or a charging device, the interface comprising a terminal assembly; a battery cell module accommodated in the shell and electrically connected to the terminal assembly, the battery cell module comprising a plurality of cylindrical battery cell units; wherein, when the interface is electrically connected to the charging device and the power level of the battery pack is less than or equal to a first threshold, the charging rate of the battery pack is greater than or equal to 4C and less than or equal to 10C.

[0033] In some embodiments, the powered device includes a riding lawn mower.

[0034] In some embodiments, the power-consuming device or the charging device includes a mobile power supply.

[0035] In some embodiments, the continuous discharge power of the battery cell unit is greater than or equal to 300W.

[0036] In some embodiments, the power density of the battery pack is greater than or equal to 1500 W / kg.

[0037] In some embodiments, the first threshold is greater than or equal to 70% and less than or equal to 90%.

[0038] In some embodiments, the battery pack includes at least 10 battery cell units, and the battery cell units are full-tab batteries.

[0039] In some embodiments, the battery cell unit is a full-tab battery.

[0040] In some embodiments, the interface is configured to be connected to an adapter, and the adapter can be connected to AC power or DC power as a charging power source.

[0041] A battery pack comprises: a shell; a battery cell module accommodated in the shell, the battery cell module comprising a plurality of battery cell units, the plurality of battery cell units comprising at least one full-tab battery; wherein the battery pack further comprises: a first interface, at least configured to be connected to an electrical device, the first interface comprising a first terminal assembly; a second interface, at least configured to be connected to a charging device, the second interface comprising a second terminal assembly; at least some of the components of the first terminal assembly and the second terminal assembly are different.

[0042] In some embodiments, the battery cell is a cylindrical battery.

[0043] In some embodiments, the electrical device includes a garden tool or a handheld tool.

[0044] In some embodiments, the charging device includes a charger or an adapter.

[0045] In some embodiments, the resistance of at least one of the battery cells is less than or equal to 10 mΩ.

[0046] In some embodiments, the energy density of at least one of the battery cells is greater than or equal to 600Wh / L.

[0047] In some embodiments, the charging rate of the battery pack is greater than or equal to 3C and less than or equal to 10C.

[0048] In some embodiments, the first terminal assembly includes a first positive terminal, a negative terminal, and a communication terminal; and the second terminal assembly includes a second positive terminal, the negative terminal, and the communication terminal.

[0049] A battery pack comprises: a shell; a terminal assembly arranged in the shell; a plurality of battery cell units arranged in the shell, each of the battery cell units comprising a positive electrode tab and a negative electrode tab; wherein the positive electrode tab or the negative electrode tab is a full-tab structure; the shell also includes a heat dissipation structure, and the minimum distance between the positive electrode tab or the negative electrode tab and the heat dissipation structure in the axial direction of the battery cell unit is less than or equal to 1 cm.

[0050] In some embodiments, the heat dissipation structure includes a busbar.

[0051] In some embodiments, the heat dissipation structure includes at least one heat dissipation material selected from the group consisting of nickel strip, copper, and nickel-plated copper.

[0052] In some embodiments, the heat dissipation structure includes a heat dissipation channel; an inlet of the heat dissipation channel faces at least one end surface of the battery core unit.

[0053] In some embodiments, the heat dissipation structure comprises a hydrogel.

[0054] An electric tool comprises: a housing; a workpiece; a motor disposed in the housing and configured to drive the workpiece; an energy storage device configured to supply power to the motor, the energy storage device comprising a plurality of battery cells; wherein the energy storage device is configured to store feedback current, wherein the maximum feedback current of each battery cell is greater than or equal to 10 amperes.

[0055] In some embodiments, the battery cell unit is a full-tab battery.

[0056] In some embodiments, the internal resistance of the battery cell is less than or equal to 10 mΩ.

[0057] In some embodiments, the energy storage device is disposed inside the housing.

[0058] In some embodiments, the energy storage device is detachably mounted to the outside of the housing.

[0059] An electric tool comprises: a housing; a working piece; a motor disposed in the housing and configured to drive the working piece; a battery pack interface disposed on the housing and configured to detachably mount a battery pack, the battery pack interface transmitting electrical energy from the battery pack to power the motor; a drive circuit configured to drive the motor to rotate; a controller configured to control the drive circuit; characterized in that the controller is further configured to: set the overcurrent protection threshold of the electric tool to a first threshold when identifying that the battery pack interface is connected to a first battery pack; and set the overcurrent protection threshold of the electric tool to a second threshold when identifying that the battery pack interface is connected to a second battery pack; wherein the first threshold is greater than or equal to twice the second threshold, and the volumes of the first battery pack and the second battery pack are the same within a preset volume floating range.

[0060] In some embodiments, the first battery pack includes a plurality of battery cell units, and the plurality of battery cell units are full-tab batteries.

[0061] In some embodiments, the controller is further configured to: when identifying that the battery pack interface is connected to a first battery pack, set the overcurrent protection response time to a first duration; when identifying that the battery pack interface is connected to a second battery pack, set the overcurrent protection response time to a second duration; wherein, the first duration is greater than the second duration.

[0062] In some embodiments, the number of battery cell units in the first battery pack is substantially the same as the number of battery cell units in the second battery pack.

[0063] A battery pack comprises: a shell; a terminal assembly disposed in the shell; a cell module accommodated in the shell and electrically connected to the terminal assembly, wherein the cell module comprises a plurality of cylindrical cell units; wherein at least one of the plurality of cell units is a test cell; a temperature detection element is provided at one end of the test cell, and the temperature detection element is configured to detect the temperature of the tab of the test cell.

[0064] In some embodiments, the test cell is substantially located at the center of gravity of the cell module.

[0065] In some embodiments, the battery pack further includes a battery management unit, and the battery management unit communicates with the temperature detection element via a communication line.

[0066] In some embodiments, the test cell is a full-tab battery.

[0067] In some embodiments, the temperature detection element includes at least a temperature sensor.

[0068] A battery pack comprises: a shell; a terminal assembly disposed in the shell; a battery cell module accommodated in the shell and electrically connected to the terminal assembly, the battery cell module comprising a plurality of battery cell units, the plurality of battery cell units comprising at least one full-tab battery; a temperature detection element configured to obtain the temperature of the full-tab battery; a battery management unit disposed in the shell and communicatively connected to the temperature detection element; wherein the battery management unit is configured to: adjust the maximum output power or maximum output current of the battery pack according to the temperature.

[0069] In some embodiments, the temperature detection element is configured to directly detect the temperature of the full-tab battery.

[0070] In some embodiments, the temperature detection element is configured to detect the ambient temperature within the battery pack and estimate the temperature of the full-tab battery based on the ambient temperature.

[0071] In some embodiments, the battery management unit is further configured to select a charging mode for the battery pack according to the temperature.

[0072] In some embodiments, the battery pack is suitable for powering a ride-on vehicle.

[0073] In some embodiments, the battery pack is suitable for powering a power tool.

[0074] An electric tool comprises: a housing; a workpiece; a motor disposed in the housing and configured to drive the workpiece; an energy storage device mounted to the housing, the energy storage device comprising a plurality of battery cells to supply power to the motor; a drive circuit disposed in the housing and configured to drive the motor, the drive circuit comprising a plurality of semiconductor switches; wherein the battery cells are full-tab batteries, and the resistance of the semiconductor switches is less than or equal to 2 milliohms.

[0075] In some embodiments, the motor includes a stator core and a winding, and a slot fill rate of the winding is greater than or equal to 40%.

[0076] In some embodiments, the motor is a flat wire motor.

[0077] In some embodiments, the semiconductor switch comprises gallium nitride.

[0078] In some embodiments, the power range of the motor is greater than or equal to 0 and less than or equal to 10 kW.

[0079] In some embodiments, the energy storage device is disposed inside the housing.

[0080] In some embodiments, the energy storage device is detachably mounted to the outside of the housing.

[0081] A battery pack for powering an electric tool comprises: a shell; an electric tool interface configured to be connected to the electric tool, the electric tool interface including a terminal assembly; a battery cell module accommodated in the shell and electrically connected to the terminal assembly, the battery cell module including a plurality of battery cell units, the plurality of battery cell units including at least one full-tab battery; a magnetic current sensor configured to detect the current of the battery cell module, the magnetic current sensor being disposed within the shell.

[0082] In some embodiments, the terminal assembly includes a first positive terminal, a second positive terminal, a negative terminal, and a communication terminal.

[0083] In some embodiments, the battery pack further includes: a cell connecting piece configured to connect a plurality of cell units; the cell connecting piece has an uneven thickness.

[0084] In some embodiments, the thickness of the battery cell connecting piece at the welding portion is smaller than the thickness of the non-welding portion.

[0085] In some embodiments, the magnetic current sensor is arranged on the charge / discharge circuit of the battery module.

[0086] A battery pack for powering an electric tool, comprising: a housing; an electric tool interface configured to connect to the electric tool; a battery module housed in the housing, the battery module comprising a plurality of battery cells; and a battery connecting piece configured to connect at least two of the battery cells; wherein, when the battery pack continuously powers the electric tool at a current of 100 A for at least 30 seconds, the temperature rise of the battery connecting piece is less than or equal to 120°C.

[0087] In one embodiment, a reinforcing piece is provided on the non-welding surface of the battery cell connecting piece.

[0088] In one embodiment, the reinforcement comprises a metal sheet or a metal coating.

[0089] In one embodiment, the reinforcement comprises a copper sheet or a copper coating.

[0090] In one embodiment, the thickness of the reinforcing piece is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0091] In one embodiment, the thickness of the reinforcing piece is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0092] In one embodiment, the number of welding points between the battery cell connecting piece and the battery cell unit is greater than or equal to 4 and less than or equal to 8.

[0093] In one embodiment, the surface shape of the reinforcing piece is different from the surface shape of the battery cell connecting piece.

[0094] In one embodiment, the surface shape of the reinforcing piece is consistent with the surface shape of the battery cell connecting piece.

[0095] In one embodiment, the reinforcement member is provided on the battery cell connecting piece in a manner including at least one of welding, rolling or composite processes.

[0096] In one embodiment, the reinforcing member is made of a material different from the battery cell connecting piece.

[0097] A battery pack comprises: a shell; a battery cell module accommodated in the shell, the battery cell module comprising a plurality of battery cell units; a battery cell connecting piece configured to connect at least two of the battery cell units; wherein the contact impedance between the battery cell connecting piece and the battery cell units is less than or equal to 10 μΩ.

[0098] In one embodiment, a reinforcing piece is provided on the non-welding surface of the battery cell connecting piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0100] FIG1 is a perspective view of a battery pack provided in one embodiment of the present application;

[0101] FIG2 a is an exploded view of a battery pack provided in one embodiment of the present application;

[0102] FIG2 b is a schematic diagram of a partial structure of a battery pack provided by an embodiment of the present application;

[0103] FIG2c is a schematic structural diagram of a cell connecting piece provided in one embodiment of the present application;

[0104] FIG2 d is a schematic structural diagram of a cell connecting piece provided in one embodiment of the present application;

[0105] FIG3 is a schematic diagram of a battery pack terminal charging and discharging port provided by one embodiment of the present application;

[0106] FIG4 is an exemplary diagram of an electric tool to which a battery pack according to an embodiment of the present application is applicable;

[0107] FIG5 is an exemplary diagram of a power supply device applicable to a battery pack provided in one embodiment of the present application;

[0108] FIG6 is a schematic structural diagram of a battery cell unit provided in one embodiment of the present application;

[0109] FIG7 is a schematic diagram of a tab in a conventional battery cell unit provided by one embodiment of the present application;

[0110] FIG8 is a schematic diagram of a full-tab battery cell unit provided by one embodiment of the present application;

[0111] FIG9 is a schematic diagram of voltage changes of a cell unit during discharge of a battery pack provided by one embodiment of the present application;

[0112] FIG10 is an example diagram of a test cell in a battery pack provided by one embodiment of the present application;

[0113] FIG11 is a control circuit diagram of an electric tool used with a battery pack provided in one embodiment of the present application. DETAILED DESCRIPTION

[0114] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0115] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0116] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0117] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0118] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0119] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0120] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0121] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0122] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0123] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0124] Referring to the battery pack 100 shown in Figures 1 and 2, it mainly includes a shell 11, an interface 12, and a battery module 13. In the present application, the interface 12 may also be referred to as a power tool interface, which is mainly configured to connect to a power tool. The interfaces or power tool interfaces hereinafter may be interchangeable. Among them, the power tool interface 12 includes a terminal assembly 121. The terminal assembly 121 can at least transmit electrical energy between the battery pack 100 and the power tool. In other embodiments, the terminal assembly 121 can also transmit electrical energy between the battery pack 100 and a charger or adapter, or can transmit electrical energy between the battery pack 100 and other electrical devices. In one embodiment, the terminal assembly 121 may include a positive terminal, a negative terminal and a communication terminal, or at least a positive terminal and a negative terminal. The battery module 13 is disposed in the shell 11 and can be directly or indirectly electrically connected to the terminal assembly 121. As shown in FIG. 2 a to FIG. 2 d , the battery cell module 13 may include a plurality of battery cell units 131 , a battery cell support 132 for supporting the battery cell units 131 , and a battery cell connecting piece 133 for electrically connecting the plurality of battery cell units 131 .

[0125] In this embodiment, the interface 12 may include a first interface 12a and a second interface 12b. The first interface 12a and the second interface 12b may be two completely independent groups of interfaces, or they may share some terminal assemblies. In one embodiment, the first interface 12a may include a first terminal assembly 12a1, and the second interface 12b may include a second terminal assembly 12b1, wherein at least some of the components of the first terminal assembly 12a1 and the second terminal assembly 12b1 are the same or different. Exemplarily, the first terminal assembly 12a1 includes a first positive terminal, a negative terminal and a communication terminal, and the second terminal assembly 12b1 includes a second positive terminal, a negative terminal and a communication terminal, that is, the first terminal assembly 12a1 and the second terminal assembly 12b1 share a negative terminal and a communication terminal, but have different positive terminals.

[0126] In one embodiment, both the first interface 12a and the second interface 12b can serve as charging interfaces. For example, both can be connected to a charger, a mobile power supply, or an adapter to charge the battery pack 100 using AC power or other battery packs as a charging power source. In one embodiment, the first interface 12a and the second interface 12b can both be discharge interfaces. In alternative implementations, the output voltage or output power of the two interfaces can be different or the same.

[0127] In one embodiment, the first interface 12a can be configured to connect to an electrical device, such as various power tools or other DC devices, while the second interface 12b is configured to connect to a charging device, such as a charger or a mobile power supply. In other words, the battery pack 100 is a battery pack with different charging and discharging ports. As shown in Figure 3, the battery pack 100 can be connected to the power tool 200 or the charger 300a via the interface 12. The selection switch 121 within the battery pack 100 can control the interface 12 to be the first interface 12a or the second interface 12b depending on the electrical device connected to the interface 12. In this embodiment, the first interface 12a can be connected to the charger 300a. When the selection switch 121 is closed, the positive terminals p+ and c+, the negative terminal p-, and the communication terminal D constitute the first interface 12a. The second interface 12b can be connected to the power tool 200. When the selection switch 121 is open, the positive terminal p+, the negative terminal p-, and the communication terminal D constitute the second interface 12b.

[0128] In this embodiment, a variety of different types of power tools 200 can be powered by the battery pack 100. FIG4 illustrates several common power tools, such as a riding lawn mower 200a, an electric drill 200b, a chainsaw 200c, a lawn trimmer 200d, and a hair dryer 200e. It should be noted that the power tool 200 can also be a handheld power tool, such as a drill, a pruner, or a sander. Alternatively, the power tool 200 can be a benchtop tool, such as a table saw or a miter saw. Alternatively, the power tool 200 can be a push power tool, such as a push lawn mower or a push snow blower. Alternatively, the power tool 200 can be a ride-on power tool, such as a ride-on lawn mower, a ride-on vehicle, or an all-terrain vehicle. Alternatively, the power tool 200 can be a robotic tool, such as a lawn mower robot or a snow blower robot. In some embodiments, the power tool 200 can be an electric drill, an electric light, or an electric vehicle. In some embodiments, the power tool 200 can also be a gardening tool, such as a pruner, hair dryer, lawn mower, or chainsaw. Alternatively, the power tool 200 can also be a decorating tool, such as a screwdriver, nail gun, circular saw, or sander. In some embodiments, the power tool 200 can also be a vegetation care tool, such as a lawn mower, lawn mower, pruner, or chainsaw. Alternatively, the power tool 200 can also be a cleaning tool, such as a hair dryer, snow blower, or washer. Alternatively, the power tool 200 can also be a drilling tool, such as a drill, screwdriver, wrench, or electric hammer. Alternatively, the power tool 200 can also be a sawing tool, such as a reciprocating saw, jig saw, or circular saw. Alternatively, the power tool 200 can also be a benchtop tool, such as a table saw, miter saw, metal cutter, or router. Alternatively, the power tool 200 can also be a grinding tool, such as an angle grinder or sander. Alternatively, the power tool 200 can also be other tools, such as a lamp or fan.

[0129] The power tool 200 powered by the battery pack 100 may have a battery pack mounting portion configured to mount the battery pack 100. In one embodiment, the battery pack 100 is removably mounted to the housing 201 of the power tool 200. In one embodiment, the battery pack 100 is fixedly mounted within a receiving cavity formed by the housing 201, that is, the battery pack 100 is built into the power tool 200.

[0130] The battery pack 100 can also be connected to the mobile power supply 300 shown in Figure 5. The mobile power supply 300 can serve as a small mobile power station, capable of connecting to the power grid, a car charging station, or a photovoltaic charging panel to obtain charging energy. The mobile power supply 300 can be equipped with an energy storage device such as a battery pack or a capacitor. The mobile power supply 300 can also have a DC output interface or an AC output interface, capable of outputting DC power or AC power.

[0131] In this embodiment, the mobile power supply 300 can also be detachably connected to the battery pack 100. The mobile power supply 300 can charge the connected battery pack 100, and can also use the electrical energy of the battery pack 100 to reversely charge the energy storage device in the mobile power supply 300. In other words, the battery pack 100 can supply power to the mobile power supply 300, and can also obtain electrical energy from the mobile power supply 300. In one embodiment, the battery pack 100 can be connected to the housing of the mobile power supply 300, or to the closed or semi-closed accommodating cavity formed by the housing of the mobile power supply 300. This embodiment does not specifically limit the structural form of the mobile power supply 300 as a mobile power station.

[0132] The battery pack 100 is an energy storage element, and the battery cell 131 therein can be considered a core component. The structure or composition of the battery cell 131 directly affects the output characteristics of the battery pack 100. In this embodiment, the battery cell 131 can be a cylindrical battery, as shown in Figure 6, and can include an anode 1311, a cathode 1312, an electrolyte 1313, and a cylindrical casing 1317. In one implementation, the anode 1311 and cathode 1312 are longitudinally wound together to form a battery cell. In the wound configuration, the electrolyte 1313 is disposed between the opposing surfaces of the anode 1311 and cathode 1312. In one embodiment, the electrolyte 1313 can be an organic solvent, a solid electrolyte, a lithium-ion liquid electrolyte, or a polymer electrolyte. The anode 1311 and cathode 1312 can be formed of any suitable material. For example, the cathode and anode can include a sheet or panel coated with or formed from a lithium oxide alloy or a lithium compound. In one embodiment, the anode 1311 and cathode 1312 can include a sheet or panel made of graphite, graphene, silicon, or silicon oxide.

[0133] To conduct electrical energy from the battery cell 131, the battery cell 131 also includes tabs 1314 connected to the anode 1311 and cathode 1312, which can conduct electricity out of the battery cell 131. In a single-tab battery as shown in FIG7 , the tabs 1314 can be configured as electrode material extending along the longitudinal edge of the battery cell 131. For example, tabs 1314 can be configured as protrusions, grooves, or teeth on a conductive sheet material extending beyond the coating material of the anode 1311 or cathode 1312.

[0134] The structure of the battery cell 131 shown in Figure 7 can be wound in the winding direction indicated by the arrow to form a single battery cell. After winding, the two ends of the battery cell 131 transmit electrical energy through the tabs 1314. As shown in Figures 6 and 7, the battery cell 131 may also include a positive terminal cap 1315 and a negative terminal cap 1316. The positive terminal cap 1315 is electrically connected to the tab 1314 of the anode 1311, and the negative terminal cap 1316 is electrically connected to the tab 1314 of the cathode 1312. The battery cell connector 133 can connect the positive terminal caps 1315 or the negative terminal caps 1316 of multiple battery cells 131, thereby electrically connecting the multiple battery cells 131.

[0135] The battery tabs 1314 are generally designed to be one or more, which to a certain extent limits the size of the power conduction path, thereby affecting the output characteristics of the battery pack 100, such as the output power or discharge rate or overcurrent capability of the battery pack 100.

[0136] In this embodiment of the present application, the battery cell 131 is a full-tab battery. As shown in Figure 8, the tabs 1314 of the full-tab battery are configured as conductive plates that are continuously arranged along the entire longitudinal extension of the anode 1311 or cathode 1312. In other embodiments, full-tab batteries may also be referred to as tab-free batteries. In this embodiment, the full-tab battery unit or full-tab battery cell can be understood as a full-tab battery.

[0137] In this embodiment, the continuous discharge power of the full-tab battery cell 131 is greater than or equal to 300 W. In other embodiments, the continuous discharge power of the battery cell 131 is greater than or equal to 350 W, or greater than or equal to 400 W, or greater than or equal to 500 W. In this embodiment, the instantaneous discharge power of the battery cell 131 is greater than or equal to 550 W, or greater than or equal to 600 W, or greater than or equal to 650 W. In other words, the full-tab battery cell 131 in this application can provide a larger instantaneous power or continuous discharge power, so that it can adapt to the power requirements of different power tools under different working conditions.

[0138] Since the full-tab battery cells 131 have a strong discharge capacity, to prevent the heat generated by the battery cells 131 from being unable to be promptly dissipated due to continuous high-current discharge, the minimum distance between the battery cells 131 can be set to be greater than or equal to 2 mm, or greater than or equal to 2.5 mm, or greater than or equal to 3 mm. In this embodiment, the minimum distance between the battery cells 131 can be the minimum distance between adjacent battery cells 131 in the horizontal or vertical direction.

[0139] In one embodiment, the diameter of the full-tab battery cell 131 is greater than or equal to 3 cm, for example, the diameter of the full-tab battery cell 131 is 3 cm, 3.5 cm, or 4 cm. In one embodiment, the diameter of the full-tab battery cell 131 is greater than or equal to 4 cm, for example, it can be 4.5 cm, 4.6 cm, or 5 cm. In this embodiment, the height of the full-tab battery cell 131 is greater than or equal to 8 cm, for example, the height of the full-tab battery cell 131 is 8 cm, 9 cm, 10 cm, 11 cm, 12 cm, 13 cm, or 13.5 cm.

[0140] By adopting full-electrode tabs, the ability of the electrode to transmit electrical energy is increased, while the internal resistance of the battery cell 131 is reduced. Exemplarily, the internal resistance of the battery cell 131 is less than or equal to 10mΩ, or less than or equal to 9mΩ, or less than or equal to 8mΩ, or less than or equal to 7mΩ, or less than or equal to 6mΩ, or less than or equal to 5mΩ. In this embodiment, the battery cell 131 can be a 4680 battery cell. In one embodiment, the energy density of the battery cell 131 is greater than or equal to 600Wh / L, or greater than or equal to 620Wh / L, or greater than or equal to 650Wh / L, or greater than or equal to 660Wh / L, or greater than or equal to 680Wh / L, or greater than or equal to 700Wh / L. In this embodiment, to match the discharge capacity of the battery cell 131, the battery cell connecting piece 133 connecting multiple battery cells 131 can be locally thickened. In one embodiment, the thickness of the battery cell connecting piece 133 at the connection point with the battery cell 131 is less than the thickness at the non-connection point. In one embodiment, the ratio of the thickness of the cell connecting piece 133 at the connection point between the cell connecting piece 133 and the cell unit 131 to the thickness at the non-connection point is less than 1, or less than 0.8, or less than 0.6, or less than 0.5, etc. In one embodiment, the cell connecting piece 133 can be connected to the cell unit 131 by welding, and the number of welds or welding points at the weld is greater than or equal to 2, or is continuous welding without breakpoints, or is less than or equal to 8, which can ensure the overcurrent capacity of the connection. In one embodiment, in order to enhance the overcurrent capacity of the cell connecting piece 133, a reinforcement piece 1331 can be provided on the non-welding surface 133a of the cell connecting piece 133, as shown in Figures 2c and 2d. Among them, the non-welding surface 133a of the cell connecting piece 133 can be understood as the side facing away from the cell unit 131 to which it is connected. Alternatively, based on the connection between the cell connecting piece 133 and the cell unit 131, the side of the cell connecting piece 133 that is directly connected to the cell unit 131 is defined as the welding surface 133b, and the other side opposite to the welding surface is defined as the non-welding surface 133a. In other words, the non-welding surface 133a of the cell connecting piece 133 is not in direct contact or in other words, not in contact with the cell unit 131 to which it is connected. In this application, the welding surface 133a and the non-welding surface 133a of the cell connecting piece 133 are only used to distinguish and define whether it is in direct contact with the connected cell unit 131, and do not mean that welding is not performed on the non-welding surface 133a or that welding is performed on the welding surface 133b.

[0141] In one embodiment, the reinforcement 1331 may be a metal member or metal coating disposed on the non-welding surface 133a. For example, it may be a copper sheet or copper coating, or other types of metal sheets or coatings. In one embodiment, the reinforcement 1331 may be disposed on the non-welding surface 133a by welding, rolling, laminating, or other processes.

[0142] In one implementation, the surface shape of the reinforcement 1331 is different from the surface shape of the battery cell connecting piece 133 as shown in Figure 2c. The reinforcement 1331 can be welded to the non-welding surface 133a of the battery cell connecting piece 133 by resistance welding or laser welding, thereby forming a battery cell connecting piece assembly with stronger overcurrent capability and better heat dissipation performance.

[0143] In one implementation, the surface shape of the reinforcing piece 1331, as shown in FIG2d , is consistent with the surface shape of the cell connection piece 133. That is, the reinforcing piece 1331 can be completely attached to the non-welding surface 133a of the cell connection piece 133, forming a cell connection piece assembly having two metal layers. In this embodiment, the reinforcing piece 1331 can be processed onto the non-welding surface 133a by rolling or other composite processes.

[0144] In one embodiment, the thickness of the reinforcing piece 1331 is greater than or equal to 0.1 mm and less than or equal to 2 mm. In one embodiment, the thickness of the reinforcing piece 1331 is greater than or equal to 0.5 mm and less than or equal to 1 mm. In one embodiment, the thickness of the reinforcing piece 1331 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. For example, the thickness of the reinforcing piece 1331 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, etc.

[0145] In one embodiment, the cell connection piece 133 is made of a different material than the reinforcing piece 1331. For example, the reinforcing piece 1331 is made of copper, while the cell connection piece 133 is made of nickel. Alternatively, the reinforcing piece 1331 is made of copper, while the cell connection piece 133 is made of a nickel alloy, such as NB109.

[0146] In this embodiment, the contact impedance or welding internal resistance between the battery cell connecting piece 133 and the battery cell unit 131 is less than or equal to 10 μΩ. Therefore, the temperature rise rate of the battery pack is relatively slow during the charging or discharging process of the battery pack.

[0147] In this embodiment, when the battery pack is continuously discharged at a current of 100 A for 30 seconds, the temperature rise of the cell connection tab 133 is less than or equal to 120° C. Therefore, the cell connection tab 133 can meet the discharge or charge requirements of a full-tab battery.

[0148] In this embodiment, in order to better dissipate heat for the battery cell unit 131, a heat dissipation structure 14 is further provided in the battery pack 100. As shown in Figure 6, the heat dissipation structure 14 can be provided near the positive terminal cap 1315 or the negative terminal cap 1316 of the battery cell unit 131 to enhance the heat dissipation capacity of the tab 1314. In this embodiment, the minimum straight-line distance between the heat dissipation structure 14 and the anode or cathode tab 1314 is less than or equal to 0.5 cm, or less than or equal to 1 cm, or less than or equal to 1.5 cm. In one embodiment, the heat dissipation structure 14 may include a busbar that can dissipate the heat dissipated by the battery cell unit 131. The busbar at the connection with the tab 1314 is at least partially configured as a channel with a wavy shape or other shapes such as a serrated shape to increase the exhaust path of hot gas. In this embodiment, the heat dissipation structure 14 may include at least one heat dissipation material selected from nickel strips, copper, and nickel-plated copper. In one embodiment, the heat dissipation structure 14 may also be a hydrogel.

[0149] In this embodiment, some or all of the cell units 131 of the battery pack 100 are configured as full-tab batteries, which significantly improves the power density of the battery pack 100. In one embodiment, the output power density of the battery pack 100 is greater than or equal to 1500W / kg, or greater than or equal to 1600W / kg, or greater than or equal to 1700W / kg, or greater than or equal to 1800W / kg, or greater than or equal to 1900W / kg, or greater than or equal to 2000W / kg. In this embodiment, the number of full-tab batteries in the battery pack 100 is greater than or equal to 10, or greater than or equal to 15, and the continuous discharge power of any full-tab battery is greater than or equal to 300W.

[0150] Under certain conditions, the battery pack 100 can be fast charged. For example, when the remaining power of the battery pack 100 is less than or equal to a first threshold, the charge rate of the battery pack 100 is greater than or equal to 4C and less than or equal to 10C. The first threshold can be a percentage of the remaining power of the battery pack 100 to the total power of the battery pack. The threshold can be any value between greater than or equal to 70% and less than or equal to 90%, for example, 70%, 75%, 80%, 85%, 90%, etc.

[0151] In one embodiment, a power interface can be provided in the riding lawn mower so as to be connected to at least the battery pack 100, so that the battery pack 100 can power the riding lawn mower. The battery cell unit 131 in the battery pack 100 is a full-tab battery. In this embodiment, the battery pack 100 can also be referred to as a first energy storage device, and the output power density of the energy storage device is greater than or equal to 1500W / kg. In an optional implementation, the riding lawn mower can also be configured with a second energy storage device different from the first energy storage device, and the second battery cell unit in the second energy storage device can be a non-full-tab battery. The power density of the second energy storage device is less than the power density of the first energy storage device.

[0152] In one embodiment, the power bank 300 can also charge the battery pack 100. When the remaining power of the battery pack 100 is less than or equal to a first threshold, the charge rate of the battery pack 100 is greater than or equal to 4C and less than or equal to 10C. The first threshold can be a percentage of the remaining power of the battery pack 100 to the total power of the battery pack. The threshold can be any value between greater than or equal to 70% and less than or equal to 90%, for example, 70%, 75%, 80%, 85%, 90%, etc.

[0153] In one embodiment, the adapter can also be connected to AC mains to charge the battery pack 100. When the remaining power of the battery pack 100 is less than or equal to a first threshold, the charge rate of the battery pack 100 is greater than or equal to 4C and less than or equal to 10C. In this embodiment, the adapter can be connected to AC mains to use AC power as the charging power source for charging the battery pack 100, or it can be connected to other energy storage devices to use DC power as the charging power source for charging the battery pack 100.

[0154] In this embodiment, the battery pack 100 can power electrical devices at a maximum discharge rate of greater than or equal to 20C and less than or equal to 50C, such as powering various power tools or powering the mobile power supply 300. Exemplarily, the maximum discharge rate of the battery pack 100 is 20C, 25C, 30C, 35C, 40C, 45C, 50C, etc. In this embodiment, the battery pack 100 includes a maximum of 7 full-tab batteries, or the battery pack 100 can include a maximum of 8 full-tab batteries, or the battery pack 100 can include a maximum of 9 full-tab batteries, or the battery pack 100 can include a maximum of 10 full-tab batteries, etc. In some embodiments, the number of full-tab batteries in the battery pack 100 can be set according to the rated voltage of the battery pack 100 as required.

[0155] In one embodiment, due to the low internal resistance and strong overcurrent capability of full-tab batteries, the voltage drop across the cell 131 during the discharge of the battery pack 100 is small. For example, when the remaining charge of the battery pack 100 is greater than or equal to 50% and the battery pack 100 is discharged to an electrical device at a discharge rate greater than or equal to 2C at a preset temperature, the voltage drop across the cell 131 is less than or equal to 90mV, or less than or equal to 100mV, or less than or equal to 110mV, or less than or equal to 120mV. The preset temperature can be room temperature or normal temperature, for example, approximately 20°C, approximately 25°C, or approximately 30°C. In this embodiment, the preset temperature range can be any temperature or temperature interval within the temperature range of -20°C to 60°C. In one embodiment, assuming that the preset temperatures and discharge rates are substantially the same, the greater the remaining charge in the battery pack 100, the smaller the voltage drop across the cell 131 during discharge. For example, when the remaining power of the battery pack 100 is greater than or equal to 70% and is discharged to an electrical device at a discharge rate greater than or equal to 2C at a preset temperature, the voltage drop of the battery cell 131 is less than or equal to 80mV, or less than or equal to 85mV.

[0156] FIG9 illustrates the voltage variation of a cell 131 during discharge of a battery pack 100, with the remaining charge of the battery pack 100 at 70%, 50%, and 30%, respectively, at a preset temperature and at a discharge rate of 2C or greater. Line 1 represents the voltage variation of a cell 131 when the remaining charge of the battery pack 100 is 70%, line 2 represents the voltage variation of a cell 131 when the remaining charge of the battery pack 100 is 70%, and line 3 represents the voltage variation of a cell 131 when the remaining charge of the battery pack 100 is 70%. As can be seen from the figure, the greater the remaining charge of the battery pack 100, the smaller the voltage drop of the cell 131 during discharge. Furthermore, the voltage drop of the cell 131 during the voltage plateau period of discharge is smaller than the voltage drop during the non-voltage plateau period.

[0157] In the present embodiment, at least one of the multiple battery cells 131 in the battery pack 100 is set as a test cell, and a temperature detection element 15 is provided at one end of the test cell to detect the temperature of the test cell. In the present embodiment, the temperature of the test cell can be basically considered to be the internal temperature of the battery pack 100, or the temperature of the test cell is basically the temperature of the battery module 13. As shown in Figure 10, one or more battery cells 131 in the rectangular frame can be set as a test cell, and the test cell is basically located at the geometric center of the battery module 13, or basically located at the center of gravity of the battery module 13. In one embodiment, the test cell is basically consistent with the other battery cells 131 or the test cell is more sensitive to temperature changes, and its temperature is more representative of the temperature inside the battery pack 100. For example, the material in the test cell is more sensitive to temperature changes and is more easily detected by the temperature detection element 15.

[0158] In this embodiment, the test cell is a full-tab battery, and the temperature sensing element 15 is capable of detecting at least the temperature of the full-tab battery. Alternatively, the temperature sensing element 15 may also detect the temperature of other full-tab batteries in the battery pack 100. In one embodiment, the temperature sensing element 15 may be disposed at one end of the full-tab battery, at any circumferential position of the full-tab battery, or within the full-tab battery to directly detect the internal temperature of the battery.

[0159] The battery pack 100 also includes a battery management unit (not shown), which is mainly configured to manage the charge / discharge of the battery pack 100. In this embodiment, the temperature detection element 15 can communicate with the battery management unit via a communication line to transmit temperature data to the battery management unit. The temperature data can be the temperature of the test cell or the temperature of any full-tab battery in the battery pack. The battery management unit can determine whether the battery pack 100 is at risk of overheating based on the acquired temperature data, or control the charge / discharge rate of the battery pack based on the temperature, or control the battery pack to start charging / discharging or stop charging / discharging based on the temperature, or estimate the internal core temperature of the battery cell unit 131 based on the temperature data, or adjust the maximum output power or maximum output current of the battery pack 100 based on the temperature data, or select different charging modes or discharging modes based on the temperature data.

[0160] In one embodiment, the temperature detection element 15 can be a temperature measuring resistor, a temperature sensor, or a thermocouple.

[0161] In one embodiment, a magnetic current sensor (not shown) is further provided within the battery pack 100, which is capable of at least non-destructively detecting or monitoring the charge / discharge current of the battery module 13. In one implementation, the magnetic current sensor is electrically or communicatively connected to the battery management unit and is capable of transmitting current data to the battery management unit. In this embodiment, the magnetic current sensor can be provided in the charge / discharge circuit of the battery module 13, for example, at the power input or output of the charge / discharge circuit.

[0162] In one embodiment, the weight of the battery pack 100 can be less than or equal to 4 kg, and the battery pack 100 can continuously provide the power tool 200 with a power greater than or equal to 6 kW, so that the handheld power tool 200 can be lightweight while also having a strong discharge capacity, greatly improving the performance of the handheld power tool. In this embodiment, the weight of the battery pack 100 can also be less than or equal to 3.5 kg, or less than or equal to 3 kg, etc., and the battery pack 100 can continuously output a power greater than or equal to 6.5 kW, or greater than or equal to 7 kW. In other embodiments, the weight and continuous output power of the battery pack 100 in the handheld power tool 200 can also be a combination of any of the above parameters, such as a weight less than or equal to 3.4 kg and a continuous output power greater than or equal to 6 kW. In this embodiment, the handheld power tool 200 can be a handheld garden tool or a home improvement tool, such as a chain saw.

[0163] Referring to the control circuit diagram of power tool 200 shown in FIG11 , power tool 200 may further include a working element 21, a motor 22, a battery pack interface 23, a drive circuit 24, and a controller 25. The working element 21 may vary depending on the type of power tool 200. For example, the working element of a lawn mower may be a mowing blade, while the working element of a handheld electric drill may be a drill bit. Motor 22 may be a brushed or brushless motor. In one embodiment, motor 22 may be a hub motor. This application does not limit the type of motor 22. Battery pack interface 23 can at least connect to a battery pack 100 that includes full-tab batteries. In this embodiment, motor 22 includes a stator core and windings, wherein the windings have a slot fill factor greater than or equal to 40%, greater than or equal to 45%, or greater than or equal to 50%. In one embodiment, motor 22 may be a flat wire motor. When powered by full-tab batteries, after optimizing the motor slot fill factor and changing the motor type, the output power of motor 22 is greater than or equal to 0 and less than or equal to 10 kW.

[0164] The output end of the drive circuit 24 is electrically connected to the stator winding of the motor 22 and is used to transfer the current received from the battery pack interface 23 to the stator windings A, B, and C to drive the motor 22 to rotate. In one embodiment, the drive circuit 24 includes a plurality of switching elements Q1, Q2, Q3, Q4, Q5, and Q6. The gate end of each switching element is electrically connected to the controller 25 for receiving a control signal from the controller 25. The drain or source of each switching element is connected to the stator windings A, B, and C of the motor 22. The switching elements Q1-Q6 receive control signals from the controller 25 to change their respective conduction states, thereby changing the current loaded on the stator winding of the motor 22 by the power supply. In one embodiment, the drive circuit 24 can be a three-phase bridge driver circuit including six controllable semiconductor power devices (such as FETs, BJTs, IGBTs, etc.). It will be understood that the above-mentioned semiconductor switches can also be any other type of solid-state switches, such as insulated gate bipolar transistors (IGBTs), bipolar junction transistors (BJTs), etc. In this embodiment, the semiconductor switch includes at least gallium nitride (GaN). The resistance of the semiconductor switch is less than or equal to 2 milliohms, for example, 1 milliohm or 2 milliohms.

[0165] To drive the motor 22 shown in FIG10 , the drive circuit 24 has multiple drive states. In different drive states, the speed or direction of the motor 22 can be different. This application does not describe in detail the process by which the controller 25 controls the drive circuit 24 to change different drive states to achieve different speeds or directions for the motor 22.

[0166] In this embodiment, the battery pack interface 23 is capable of connecting to at least a first battery pack and a second battery pack. The multiple battery cells in the first battery pack are partially or entirely full-tab batteries, while the multiple battery cells in the second battery pack are partially full-tab batteries. The first battery pack can be referred to as a full-tab battery pack, and the second battery pack as a standard battery pack. In this embodiment, the number of battery cells in the first battery pack is substantially the same as the number of battery cells in the second battery pack, and the volumes of the first and second battery packs are substantially the same.

[0167] The controller 25 can identify the type of battery connected to the battery pack interface 23, and then set the overcurrent protection threshold of the power tool 200 in response to overcurrent protection according to the different connected battery packs. In one embodiment, when the controller 25 identifies that the battery pack connected to the battery pack interface 23 is the first battery pack, it can set the overcurrent protection threshold of the power tool 200 to the first threshold. When the controller identifies that the battery pack connected to the battery pack interface 23 is the second battery pack, it can set the overcurrent protection threshold of the power tool 200 to the second threshold. The first threshold is greater than or equal to twice the second threshold, that is, the ratio of the first threshold to the second threshold is greater than or equal to 2. In other embodiments, the ratio of the first threshold to the second threshold is greater than or equal to 2.5, or greater than or equal to 3, or greater than or equal to 3.5, etc.

[0168] In one embodiment, the controller 25 can also set the power tool 200 to have different overcurrent protection response times according to different settings of the connected battery pack. The overcurrent protection response time can be understood as the time period from when the controller 25 detects that the working current of the motor 22 is greater than the overcurrent protection threshold to when it outputs the overcurrent protection instruction, or the time period from when the controller 25 detects that the working current of the motor 22 is greater than the overcurrent protection threshold to when it takes overcurrent protection measures, or the time period from when the controller 25 receives the overcurrent protection instruction to when it executes the instruction. In one embodiment, when the controller 25 recognizes that the battery pack interface 23 is connected to the first battery pack, the overcurrent protection response time is set to the first duration; when the controller recognizes that the battery pack interface 23 is connected to the second battery pack, the overcurrent protection response time is set to the second duration. The first duration is greater than the second duration.

[0169] Continuing to refer to Figure 10, the controller 25 can control the braking of the motor 22 or control the deceleration of the motor 22. During the braking or deceleration of the motor, a feedback current can be generated, and the feedback current can reversely charge the energy storage device connected to the battery pack interface 23. This embodiment does not elaborate on the process of how the feedback current is generated during the braking or deceleration of the motor 22. The above-mentioned energy storage device capable of receiving the feedback current can be a battery pack 100 including a full-tab battery. In this embodiment, the maximum feedback current that each battery cell 131 in the battery pack 100 can withstand is greater than or equal to 10 amperes, or greater than or equal to 15 amperes, or greater than or equal to 20 amperes.

[0170] The technical features contained in each embodiment of this application can be combined with each other to form new implementation methods, which will not be listed one by one here.

[0171] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A battery pack for powering an electric tool, comprising: case; A power tool interface, configured to be connected to the power tool, the power tool interface comprising a terminal assembly; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module comprises at least a plurality of battery cell units; The continuous discharge power of the battery cell unit is greater than or equal to 300 watts.

2. The battery pack according to claim 1, wherein: The instantaneous discharge power of the battery cell unit is greater than or equal to 550 watts.

3. The battery pack according to claim 1, wherein: The power density of the battery pack is greater than or equal to 1500 watts per kilogram.

4. The battery pack according to claim 1, wherein: The battery cell unit is a full-tab battery.

5. The battery pack according to claim 1, wherein: The terminal assembly includes a first positive terminal, a second positive terminal, a negative terminal and a communication terminal.

6. The battery pack according to claim 1, wherein: The battery pack is also configured to be detachably mounted to a riding vehicle to power the riding vehicle.

7. The battery pack according to claim 1, wherein: The battery pack is also configured to be detachably mounted on a mobile power source to at least supply power to the mobile power source.

8. The battery pack according to claim 1, wherein: The minimum distance between every two adjacent battery cell units in the plurality of battery cell units is greater than or equal to 2 mm.

9. A battery pack for powering an electric tool, comprising: case; A power tool interface, configured to be connected to the power tool, the power tool interface comprising a terminal assembly; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module includes at least one battery cell unit; The maximum discharge rate of the battery pack is greater than or equal to 20 times and less than or equal to 50 times.

10. The battery pack according to claim 9, wherein: At least one of the battery cells is a full-tab battery.

11. The battery pack according to claim 9, wherein: The resistance of at least one of the battery cells is less than or equal to 10 milliohms.

12. The battery pack according to claim 9, wherein: The energy density of at least one of the battery cells is greater than or equal to 600 watt-hours per liter.

13. The battery pack according to claim 9, wherein: The charging rate of the battery pack is greater than or equal to 4 times and less than or equal to 10 times.

14. A battery pack comprising: case; An interface, configured to be connected to an electrical device, the interface comprising a terminal assembly; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module comprises a plurality of battery cell units; When the remaining power of the battery pack is greater than or equal to 50% and the battery pack is discharged to the electrical device at a discharge rate greater than or equal to 2 times at a preset temperature, the voltage drop of the battery cell unit is less than or equal to 100 millivolts.

15. The battery pack according to claim 14, wherein: The battery cell unit is a cylindrical battery.

16. The battery pack according to claim 14, wherein: The battery cell unit is a full-tab battery.

17. The battery pack according to claim 14, wherein: The power density of the battery pack is greater than or equal to 1500 watts per kilogram.

18. The battery pack according to claim 16, wherein: The temperature range of the preset temperature is -20 degrees Celsius to 60 degrees Celsius.

19. A handheld electric tool comprising: case; Workpiece; A motor, disposed in the housing and configured to drive the working member; a battery pack, detachably mounted to the housing and configured to supply power to the motor; The weight of the battery pack is less than or equal to 4 kilograms, and the battery pack can continuously provide the motor with a power greater than or equal to 6 kilowatts.

20. The electric power tool according to claim 19, wherein: The battery pack includes a plurality of battery cells; at least one of the battery cells is a full-tab battery.

21. The electric power tool according to claim 19, wherein: The handheld electric tool is a garden tool.

22. The electric power tool according to claim 19, wherein: The handheld power tool is a chain saw.

23. The electric power tool according to claim 20, wherein: The battery cell unit is a cylindrical battery.

24. The electric power tool according to claim 20, wherein: The resistance of at least one of the battery cells is less than or equal to 10 milliohms.

25. A battery pack comprising: case; An interface, configured to be detachably connected to an electric device or a charging device, the interface comprising a terminal assembly; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module comprises a plurality of cylindrical battery cell units; When the interface is electrically connected to the charging device and the power level of the battery pack is less than or equal to a first threshold, the charging rate of the battery pack is greater than or equal to 4 times and less than or equal to 10 times.

26. The battery pack according to claim 25, wherein: The electrical equipment includes a riding lawn mower.

27. The battery pack according to claim 25, wherein: The power-consuming device or the charging device includes a mobile power source.

28. The battery pack according to claim 25, wherein: The continuous discharge power of the battery cell unit is greater than or equal to 300 watts.

29. The battery pack according to claim 25, wherein: The power density of the battery pack is greater than or equal to 1500 watts per kilogram.

30. The battery pack according to claim 25, wherein: The first threshold is greater than or equal to 70% and less than or equal to 90%.

31. The battery pack according to claim 25, wherein: The battery pack includes at least 10 battery cell units, and the battery cell units are full-tab batteries.

32. The battery pack according to claim 25, wherein: The battery cell unit is a full-tab battery.

33. The battery pack according to claim 25, wherein: The interface is configured to be connected to an adapter, and the adapter can be connected to alternating current or direct current as a charging power source.

34. A battery pack comprising: case; A battery cell module is contained in the housing, wherein the battery cell module includes a plurality of battery cell units, and the plurality of battery cell units include at least one full-tab battery; The battery pack further comprises: A first interface, at least configured to be connected to an electrical device, the first interface comprising a first terminal assembly; A second interface, at least configured to be connected to a charging device, the second interface comprising a second terminal assembly; At least some of the components of the first terminal assembly and the second terminal assembly are different.

35. The battery pack according to claim 34, wherein: The battery cell unit is a cylindrical battery.

36. The battery pack according to claim 34, wherein: The electrical equipment includes garden tools or handheld tools.

37. The battery pack according to claim 34, wherein: The charging device includes a charger or an adapter.

38. The battery pack according to claim 34, wherein: The resistance of at least one of the battery cells is less than or equal to 10 milliohms.

39. The battery pack according to claim 34, wherein: The energy density of at least one of the battery cells is greater than or equal to 600 watt-hours per liter.

40. The battery pack according to claim 34, wherein: The charging rate of the battery pack is greater than or equal to 3 times and less than or equal to 10 times.

41. The battery pack according to claim 34, wherein: The first terminal assembly includes a first positive terminal, a negative terminal and a communication terminal; the second terminal assembly includes a second positive terminal, the negative terminal and the communication terminal.

42. A battery pack comprising: case; A terminal assembly, arranged in the housing; A plurality of battery cell units are arranged in the housing, each of the battery cell units comprising a positive electrode tab and a negative electrode tab; The positive electrode tab or the negative electrode tab is a full-tab structure; The shell also includes a heat dissipation structure, and the minimum distance between the positive electrode tab or the negative electrode tab and the heat dissipation structure in the axial direction of the battery cell unit is less than or equal to 1 cm.

43. The battery pack according to claim 42, wherein: The heat dissipation structure includes a current collector.

44. The battery pack according to claim 42, wherein: The heat dissipation structure includes at least one heat dissipation material selected from the group consisting of nickel strip, copper, and nickel-plated copper.

45. The battery pack according to claim 42, wherein: The heat dissipation structure comprises a heat dissipation channel; an inlet of the heat dissipation channel faces at least one end surface of the battery core unit.

46. ​​The battery pack according to claim 42, wherein: The heat dissipation structure includes hydrogel.

47. An electric tool comprising: case; Workpiece; A motor, disposed in the housing and configured to drive the working member; An energy storage device, configured to supply power to the motor, the energy storage device comprising a plurality of battery cells; The energy storage device is configured to store feedback current, wherein the maximum feedback current of each of the battery cells is greater than or equal to 10 amperes.

48. The power tool according to claim 47, wherein: The battery cell unit is a full-tab battery.

49. The power tool according to claim 47, wherein: The internal resistance of the battery cell unit is less than or equal to 10 milliohms.

50. The power tool according to claim 47, wherein: The energy storage device is arranged inside the shell.

51. The power tool according to claim 47, wherein: The energy storage device is detachably mounted to the outside of the housing.

52. An electric tool comprising: case; Workpiece; A motor, disposed in the housing and configured to drive the working member; A battery pack interface, disposed on the housing, configured to detachably mount a battery pack, the battery pack interface transmitting electrical energy from the battery pack to power the motor; A driving circuit, configured to drive the motor to rotate; a controller configured to control the driving circuit; The controller is also configured to: When it is recognized that the battery pack interface is connected to a first battery pack, setting an overcurrent protection threshold of the electric tool to a first threshold; When it is recognized that the battery pack interface is connected to a second battery pack, setting the overcurrent protection threshold of the electric tool to a second threshold; The first threshold is greater than or equal to twice the second threshold, and the volumes of the first battery pack and the second battery pack are the same within a preset volume floating range.

53. The power tool according to claim 52, wherein: The first battery pack includes a plurality of battery cell units, and the plurality of battery cell units are full-tab batteries.

54. The power tool according to claim 52, wherein: The controller is also configured to: when identifying that the battery pack interface is connected to a first battery pack, set the overcurrent protection response time to a first duration; when identifying that the battery pack interface is connected to a second battery pack, set the overcurrent protection response time to a second duration; wherein the first duration is greater than the second duration.

55. The power tool according to claim 52, wherein: The number of battery cell units in the first battery pack is substantially the same as the number of battery cell units in the second battery pack.

56. A battery pack comprising: case; A terminal assembly, arranged in the housing; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module comprises a plurality of cylindrical battery cell units; At least one of the plurality of battery cell units is a test battery cell; A temperature detection element is provided at one end of the test cell, and the temperature detection element is configured to detect the temperature of the tab of the test cell.

57. The battery pack according to claim 56, wherein: The test cell is substantially located at the center of gravity of the cell module.

58. The battery pack according to claim 56, further comprising a battery management unit, wherein the battery management unit communicates with the temperature detection element via a communication line.

59. The battery pack according to claim 56, wherein: The test battery cell is a full-tab battery.

60. The battery pack according to claim 56, wherein: The temperature detection element includes at least a temperature sensor.

61. A battery pack comprising: case; A terminal assembly, arranged in the housing; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module comprises a plurality of battery cell units, and the plurality of battery cell units comprises at least one full-tab battery; A temperature detection element, configured to obtain the temperature of the full-tab battery; A battery management unit is disposed in the housing and is in communication connection with the temperature detection element; Wherein, the battery management unit is configured as: The maximum output power or the maximum output current of the battery pack is adjusted according to the temperature.

62. The battery pack according to claim 61, wherein: The temperature detection element is configured to directly detect the temperature of the full-tab battery.

63. The battery pack according to claim 61, wherein: The temperature detection element is configured to detect the ambient temperature in the battery pack and estimate the temperature of the full-tab battery according to the ambient temperature.

64. The battery pack according to claim 61, wherein: The battery management unit is further configured to select a charging mode of the battery pack according to the temperature.

65. The battery pack according to claim 61, wherein: The battery pack is suitable for powering a riding vehicle.

66. The battery pack according to claim 61, wherein: The battery pack is suitable for powering an electric tool.

67. An electric tool comprising: case; Workpiece; A motor, disposed in the housing and configured to drive the working member; An energy storage device, mounted to the housing, the energy storage device comprising a plurality of battery cells to supply power to the motor; A drive circuit, disposed in the housing and configured to drive the motor, the drive circuit comprising a plurality of semiconductor switches; The battery cell unit is a full-tab battery, and the resistance of the semiconductor switch is less than or equal to 2 milliohms.

68. The power tool according to claim 67, wherein: The motor comprises a stator core and a winding, and the slot fill rate of the winding is greater than or equal to 40%.

69. The power tool according to claim 67, wherein: The motor is a flat wire motor.

70. The power tool according to claim 67, wherein: The semiconductor switch includes gallium nitride.

71. The power tool according to claim 67, wherein: The power range of the motor is greater than or equal to 0 and less than or equal to 10 kilowatts.

72. The power tool according to claim 67, wherein: The energy storage device is arranged inside the shell.

73. The power tool according to claim 67, wherein: The energy storage device is detachably mounted to the outside of the housing.

74. A battery pack for powering an electric tool, comprising: case; A power tool interface, configured to be connected to the power tool, the power tool interface comprising a terminal assembly; A battery cell module, contained in the housing and electrically connected to the terminal assembly, wherein the battery cell module comprises a plurality of battery cell units, and the plurality of battery cell units comprises at least one full-tab battery; The magnetic current sensor is configured to detect the current of the battery core module, and the magnetic current sensor is arranged in the shell.

75. The battery pack according to claim 74, wherein: The terminal assembly includes a first positive terminal, a second positive terminal, a negative terminal and a communication terminal.

76. The battery pack according to claim 74, further comprising: A battery cell connecting piece, configured to connect a plurality of battery cell units; The thickness of the battery core connecting sheet is uneven.

77. The battery pack according to claim 76, wherein: The thickness of the battery core connecting piece at the welding part is smaller than the thickness of the non-welding part.

78. The battery pack according to claim 76, wherein: The magnetic current sensor is arranged on the charging / discharging circuit of the battery core module.

79. A battery pack for powering an electric tool, comprising: case; An electric tool interface, configured to connect to the electric tool; A battery cell module is contained in the housing, wherein the battery cell module comprises a plurality of battery cell units; A battery cell connecting sheet, configured to connect at least two of the battery cell units; Wherein, when the battery pack continuously supplies power to the electric tool at a current of 100 amperes for at least 30 seconds, the temperature rise of the battery cell connecting piece is less than or equal to 120 degrees Celsius.

80. The battery pack according to claim 79, wherein: A reinforcing piece is arranged on the non-welding surface of the battery core connecting piece.

81. The battery pack according to claim 80, wherein: The reinforcing member includes a metal sheet or a metal coating.

82. The battery pack according to claim 80, wherein: The reinforcing member includes a copper sheet or a copper coating.

83. The battery pack according to claim 80, wherein: The thickness of the reinforcing piece is greater than or equal to 0.1 mm and less than or equal to 2 mm.

84. The battery pack according to claim 80, wherein: The thickness of the reinforcing piece is greater than or equal to 0.2 mm and less than or equal to 1 mm.

85. The battery pack according to claim 79, wherein: The number of welding points between the battery cell connecting sheet and the battery cell unit is greater than or equal to 4 and less than or equal to 8.

86. The battery pack according to claim 80, wherein: The surface shape of the reinforcing member is different from the surface shape of the battery cell connecting piece.

87. The battery pack according to claim 80, wherein: The surface shape of the reinforcing piece is consistent with the surface shape of the battery core connecting piece.

88. The battery pack according to claim 80, wherein: The reinforcing member is arranged on the battery cell connecting sheet in a manner including at least one of welding, rolling or composite process.

89. The battery pack according to claim 80, wherein: The reinforcing member is made of a material different from the battery cell connecting sheet.

90. A battery pack comprising: case; A battery cell module is contained in the housing, wherein the battery cell module comprises a plurality of battery cell units; A battery cell connecting sheet, configured to connect at least two of the battery cell units; Wherein, the contact impedance between the battery cell connecting sheet and the battery cell unit is less than or equal to 10 microohms.

91. The battery pack according to claim 90, wherein: A reinforcing piece is arranged on the non-welding surface of the battery core connecting piece.

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