Electric tool and battery pack suitable for electric tool

Abstract

The utility model discloses an electric tool and a battery pack suitable for the electric tool. The electric tool comprises a tool main machine which comprises an output piece used for outputting power, a motor driving the output piece to move and a main machine shell containing at least part of the motor; and the battery pack is used for being detachably connected to the host shell to supply power to the motor. The tool host comprises a host interface, the battery pack comprises a battery pack interface matched with the host interface, the host interface is connected with the battery pack interface when the battery pack is installed on the tool host, and the battery pack further comprises a battery pack shell; the battery cell unit is arranged in the battery pack shell and is electrically connected with the battery pack interface; the battery cell units are bag-shaped battery cells, at least part of at least one battery cell unit is stacked along a stacking direction, the volume energy density of the battery pack is greater than or equal to 100mWh / cm < 3 >, and the nominal voltage of the battery pack is less than or equal to 9V. The electric tool is long in endurance time and small in size.

Description

Technical Field

[0001] The present application relates to the field of tools, and in particular to an electric tool and a battery pack suitable for the electric tool. Background Art

[0002] Power tools in the related art typically include a tool body and a battery pack. Existing tool bodies typically include high-voltage platform power tools and low-voltage platform power tools. The battery packs in low-voltage platform power tools have lower energy density, resulting in shorter battery life.

[0003] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0004] 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 power tool with long battery life and convenient operation for users, and a battery pack suitable for the power tool.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A power tool comprises: a tool main body, including an output member for outputting power, a motor for driving the output member to move, and a main body housing accommodating at least part of the motor; a battery pack for being detachably connected to the main body housing to power the motor; wherein the tool main body includes a main body interface, and the battery pack includes a battery pack interface that cooperates with the main body interface. When the battery pack is installed on the tool main body, the main body interface and the battery pack interface are connected. The battery pack also includes: a battery pack housing; a battery cell unit disposed in the battery pack housing and electrically connected to the battery pack interface; the battery cell unit is a pouch-shaped battery cell, and the volume energy density of the battery pack is greater than or equal to 100mWh / cm 3 , the nominal voltage of the battery pack is less than or equal to 9V.

[0007] In some embodiments, the volume energy density of the battery pack is greater than or equal to 120 mWh / cm 3 .

[0008] In some embodiments, the battery pack has a gravimetric energy density greater than or equal to 100 mWh / g.

[0009] In some embodiments, the nominal voltage of the battery pack is 8V.

[0010] In some embodiments, the number of battery cell units in the battery pack housing is 2, and the weight of the battery pack is less than or equal to 200 g.

[0011] In some embodiments, the number of battery cells in the battery pack housing is 2, and the volume of the battery pack is less than or equal to 200 cm 3 .

[0012] In some embodiments, the capacity of the battery pack is greater than or equal to 1.5 Ah and less than or equal to 5 Ah.

[0013] In some embodiments, the number of battery cell units in the battery pack shell is 4, wherein the 4 battery cell units constitute a 2P battery cell group.

[0014] In some embodiments, the main body housing includes: a motor accommodating portion for accommodating the motor and a gripping portion for a user to hold. When the battery pack is coupled to the tool main body, at least part of the battery cell unit is located in the gripping portion.

[0015] A battery pack suitable for an electric tool comprises: a battery pack housing having a joint for connecting to the electric tool; a battery cell unit disposed within the battery pack housing; and a battery pack interface for outputting power to the electric tool, the battery pack interface being electrically connected to the battery cell unit; wherein the battery cell unit is a pouch-shaped battery cell, and the volume energy density of the battery pack is greater than or equal to 100 mWh / cm 3 , the nominal voltage of the battery pack is less than or equal to 9V.

[0016] An electric tool comprises: a tool main body, including an output member for outputting power, a motor for driving the output member to move, and a main body housing that accommodates at least part of the motor; a battery pack for detachably connecting to the main body housing to power the motor; wherein, the tool main body includes a main body interface, and the battery pack includes a battery pack interface that cooperates with the main body interface. When the battery pack is installed on the tool main body, the main body interface and the battery pack interface are connected. The battery pack also includes: a battery pack housing; a battery cell unit, which is arranged in the battery pack housing and electrically connected to the battery pack interface; the battery cell unit is a bag-shaped battery cell, the weight energy density of the battery pack is greater than or equal to 100mWh / g, and the nominal voltage of the battery pack is less than or equal to 9V.

[0017] The benefit of the present application is that the battery cell unit of the power tool is a bag-shaped battery cell, which makes the energy density of the battery pack higher, improves the battery life of the battery pack and can reduce the size of the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a plan view of a power tool system according to an embodiment of the present application;

[0019] Figure 2 yes Figure 1 The plan view of the electric drill in

[0020] Figure 3 yes Figure 2A plan view of the electric drill with the tool unit and battery pack separated;

[0021] Figure 4 yes Figure 2 A three-dimensional view of a portion of the grip of an electric drill;

[0022] Figure 5 yes Figure 1 A three-dimensional diagram of the battery pack;

[0023] Figure 6a yes Figure 5 A plan view of the battery pack in FIG;

[0024] Figure 6b yes Figure 6a A cross-sectional view of the battery pack along line AA;

[0025] Figure 6c yes Figure 6a A cross-sectional view of the battery pack along line BB;

[0026] Figure 7a yes Figure 5 A side view of the battery pack;

[0027] Figure 7b yes Figure 7a Cross-sectional view of the battery pack along line CC;

[0028] Figure 8 yes Figure 5 Exploded view of the battery pack in Figure 1;

[0029] Figure 9 yes Figure 8 A perspective view of the structure shown from another perspective;

[0030] Figure 10 yes Figure 8 A plan view of the battery cell unit, battery cell bracket and circuit board assembly;

[0031] Figure 11a yes Figure 10 A three-dimensional view of the structure shown when the circuit board assembly and the battery cell holder are separated;

[0032] Figure 11b yes Figure 11a Another perspective view of the structure shown;

[0033] Figure 12a yes Figure 10 Exploded view of the structure shown;

[0034] Figure 12b yes Figure 12a Another perspective view of the structure shown;

[0035] Figure 13 yes Figure 2 A cross-sectional view of the power tool in plane P;

[0036] Figure 14 A perspective view of a charging assembly of the present application;

[0037] Figure 15 It is a module diagram of the charging combination shown in 14;

[0038] Figure 16 An exploded view of a battery pack according to another embodiment of the present application;

[0039] Figure 17 It is a three-dimensional diagram of another charging combination;

[0040] Figure 18 yes Figure 16 A plan view of the battery pack in FIG;

[0041] Figure 19 yes Figure 16 A plan view of a battery pack and a fan;

[0042] Figure 20 is a plan view of a charging assembly according to another embodiment of the present application;

[0043] Figure 21 is a plan view of another power tool of the present application;

[0044] Figure 22 is a three-dimensional diagram of a battery pack according to another embodiment of the present application;

[0045] Figure 23 yes Figure 22 A plan view of the battery pack when the first housing portion is separated;

[0046] Figure 24 yes Figure 22 Exploded view of the battery pack in Figure 1;

[0047] Figure 25 yes Figure 22 A schematic diagram of a cell unit in a battery pack;

[0048] Figure 26 Shown is a schematic diagram of the arrangement of battery cell units in another battery pack in this application. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 the specific value, the tolerance caused by manufacturing, assembly, and use associated with the specific value, etc. 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" when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular) may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0058] 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.).

[0059] like Figure 1 The battery pack 100 shown is used to power an electric tool. As an energy storage device, the battery pack 100 can transmit electricity to the electric tool to power the electrical components in the electric tool. Figure 1 As shown, the power tool can be an electric drill 200a, a grinder 200b, a wrench 200c, or a cutter 200d. It is understandable that in other embodiments, the power tool can also be a torque output tool such as a screwdriver, an impact drill, an electric hammer, a ratchet wrench, etc. The power tool can also be a grinding tool such as an angle grinder, a sander, a straight grinder, a polisher, etc. The power tool can also be a cutting tool such as an electric circular saw, a reciprocating saw, a jigsaw, etc. In some embodiments, the battery pack 100 can also be configured to be detachably coupled to devices such as electric fans and lights to power these devices, and the battery pack 100 can power the motor 212 that drives the fan blades or the light-emitting element.

[0060] like Figure 2 and Figure 3 As shown, an electric drill 200a is used as a specific example of an electric tool in this embodiment. In the following, the electric tool 200a is used to replace the electric drill 200a.

[0061] The power tool 200a includes: a tool main body 21, and a battery pack 100 is detachably connected to the tool main body 21 to provide power to the tool main body 21. The tool main body 21 includes: an output member 211, a motor 212 and a main body housing 22. The output member 211 is used to realize the functions of the power tool 200a, and the output member 211 outputs power. The output member 211 can rotate or reciprocate. In this embodiment, for the electric drill 200a, the output member 211 can be connected to the drill bit to drive the drill bit to rotate. For other power tools 200a, the output member 211 can also be a bit, a blade, a saw blade, a saw blade, a sanding base, a grinding base, etc. The motor 212 is used to drive the output member 211 to rotate, and the motor 212 is arranged in the main body housing 22. A transmission assembly can also be arranged between the motor 212 and the output member 211.

[0062] The main body housing 22 is used to accommodate the motor 212. The main body housing 22 includes a housing portion 221 for accommodating the motor 212. The battery pack 100 can be removably connected to the main body housing 22. When the battery pack 100 is connected to the main body housing 22, the battery pack 100 can establish an electrical connection with the motor 212 to power the motor 212. The tool main body 21 may also include a trigger 213 for activating the motor 212. When the trigger 213 is triggered by the user, the battery pack 100 outputs power to the motor 212, causing the motor 212 to operate.

[0063] like Figure 4 The host housing 22 includes a coupling portion 222 and a host interface 223. The coupling portion 222 is used to detachably couple the battery pack 100 to the tool host 21, and the host interface 223 is used to form an electrical connection with the battery pack 100. Figure 5 As shown, the battery pack 100 includes a mating portion 111 and a battery pack interface 12. The mating portion 111 mates with the coupling portion 222 to guide the battery pack 100 along the first straight line 101 and into the main body housing 22. The battery pack interface 12 mates with the main body interface 223 to establish an electrical connection between the battery pack 100 and the tool main body 21 when the battery pack 100 is coupled to the main body housing 22.

[0064] like Figure 4 and Figure 5As shown, the main body housing 22 is formed with a slot 224, into which the battery pack 100 is inserted along the first straight line 101. When the battery pack 100 is attached to the main body housing 22, a portion of the battery pack 100 is positioned within the slot 224, thereby reducing the size of the entire power tool 200a and facilitating the miniaturization of the power tool 200a. When the battery pack 100 is attached to the main body housing 22, a portion of the battery pack 100 is positioned outside the main body housing 22, making it easier for the user to install and remove the battery pack 100 and allowing for easier viewing of the battery pack 100.

[0065] like Figures 5 to 9 As shown, the battery pack 100 includes: a battery pack housing 11, a battery cell unit 13, a battery cell holder 14 and a circuit board assembly 15. The battery pack housing 11 is used to form a battery cell accommodating cavity 112 for accommodating the battery cell unit 13, the battery cell holder 14 and the circuit board assembly 15. The number of the battery cell unit 13 is at least one, and the battery cell unit 13 is used to store electrical energy. For example, Figures 5 to 9 In the illustrated embodiment, the number of the battery cell units 13 is 2. In some embodiments, the number of the battery cell units 13 may be multiple, that is, the number of the battery cell units 13 is greater than or equal to 2. It is understandable that the number of the battery cell units 13 is not limited to this. The battery cell holder 14 is used to support the battery cell units 13. It is understandable that in other embodiments, the battery cell holder 14 may not be provided independently, and the battery cell holder 14 may be formed by the battery pack shell 11, and the battery pack shell 11 constitutes the battery cell holder 14 that supports the battery cell units 13. The circuit board assembly 15 is used to control the charging process and the discharging process of the battery pack 100.

[0066] In this embodiment, the battery cell unit 13 is disposed within the battery pack housing 11 and is electrically connected to the battery pack interface 12 , with the battery cell unit 13 supplying power to the motor 212 via the battery pack interface 12 . The battery cell unit 13 is a pouch-shaped battery cell. The pouch-shaped battery cell includes a packaging bag and, among other things, an electrolyte disposed within the packaging bag. Pouch-shaped batteries are susceptible to deformation, so the battery cell holder 14 can serve to stabilize the shape of the pouch-shaped battery cell. The pouch-shaped battery cell has a volumetric energy density greater than or equal to 0.4 Wh / cm³. In some embodiments, the pouch-shaped battery cell has a volumetric energy density greater than or equal to 0.42 Wh / cm³. In some embodiments, the pouch-shaped battery cell has a volumetric energy density greater than or equal to 0.44 Wh / cm³. In some embodiments, the pouch-shaped battery cell has a volumetric energy density greater than or equal to 0.45 Wh / cm³. In some embodiments, the pouch-shaped battery cell has a volumetric energy density greater than or equal to 0.46 Wh / cm³. In some embodiments, the pouch-shaped battery cell has a volumetric energy density greater than or equal to 0.48 Wh / cm³. In some embodiments, the volumetric energy density of the pouch-shaped battery cell is greater than or equal to 0.5 Wh / cm³. In some embodiments, the volumetric energy density of the pouch-shaped battery cell is greater than or equal to 0.51 Wh / cm³. In some embodiments, the volumetric energy density of the pouch-shaped battery cell is greater than or equal to 0.52 Wh / cm³. In some embodiments, the volumetric energy density of the pouch-shaped battery cell is greater than or equal to 0.53 Wh / cm³.

[0067] In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 3V and less than or equal to 9V. Among them, for power tools 200a and battery packs, the nominal voltage generally refers to the voltage specified by the manufacturer or seller on the label, packaging, user manual, instruction manual, advertisement, marketing or other supporting documents of these products so that users can understand which power tools 200a and battery packs can operate with each other. Alternatively, the voltage of the battery pack 100 can also be obtained by detection or calculation. The voltage of a single battery cell 13 is generally between 3.6V and 4.2V. Figures 5 to 9 In the illustrated embodiment, the battery pack 100 includes two battery cells 13, each with a voltage of approximately 4V. The two battery cells 13 are connected in series, so the nominal voltage of the battery pack 100 can be considered to be 8V. It will be appreciated that the nominal voltage of the battery pack 100 is related to the number of battery cells 13 connected in series within the battery pack 100. For example, when the number of battery cells 13 within the battery pack 100 is one, the nominal voltage of the battery pack 100 can be considered to be between 3.6V and 4.2V, specifically 3.6V, 4V, or 4.2V.

[0068] In some embodiments, the nominal voltage of the battery pack is greater than or equal to 3 V and less than or equal to 17 V. Similarly, when the number of battery cells 13 connected in series in the battery pack 100 is 3, the nominal voltage of the battery pack 100 can be considered to be 10.8 V to 12.6 V, specifically 10.8 V, 12 V, or 12.6 V. Similarly, when the number of battery cells 13 connected in series in the battery pack 100 is 4, the nominal voltage of the battery pack 100 can be considered to be 14.4 V to 16.8 V, specifically 14.4 V, 16 V, or 16.8 V.

[0069] In this embodiment, the nominal voltage of the battery pack 100 is greater than or equal to 7 V and less than or equal to 9 V. For example, in this embodiment, the number of battery cells 13 is two, and two battery cells 13 are connected in series. Therefore, the nominal voltage of the battery pack 100 can be considered to be 7.2 V to 8.4 V, specifically 7.2 V, 8 V, or 8.4 V.

[0070] In some other embodiments, the number of battery cell units 13 of the battery pack 100 is less than or equal to 4, and the four battery cell units 13 can be connected in series. Alternatively, the four battery cell units 13 can also form two battery cell groups, the two battery cell groups are connected in parallel, and the two battery cell units 13 in each battery cell group are connected in series. When the four battery cell units form two battery cell groups, similarly, the nominal voltage of the battery pack 100 can be considered to be 8V. In some embodiments, the nominal voltage of the battery pack 100 is less than or equal to 9V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 7V.

[0071] In some embodiments, the nominal voltage of the battery pack 100 is less than or equal to 13 V. For example, the battery pack 100 includes three battery cells 13 connected in series. In this case, the nominal voltage of the battery pack 100 may be 10.8 V, 12 V, or 12.6 V. Figure 6b and 6c As shown, multiple battery cells 13 are stacked within the battery pack housing 11. Here, we can define a direction perpendicular to the battery cells 13 as a stacking direction 102 of the multiple battery cells 13. In other words, the multiple battery cells 13 are stacked sequentially along the stacking direction 102. In this embodiment, the stacking direction 102 of the multiple battery cells 13 is perpendicular to the first straight line 101 connecting the battery pack 100 to the tool body 21.

[0072] In this embodiment, the battery pack 100 is detachably connected to the tool main body 21. In fact, in other embodiments, it can be understood that the battery pack can also be a battery pack built into the main body housing, and the battery pack is used to supply power to the motor. The battery pack includes at least one battery cell unit, and the battery cell unit is used to store electrical energy. The battery cell unit is arranged in the holding part, and the extension plane of the battery cell unit is parallel to the first straight line direction. All technical solutions applicable to the battery pack built into the main body housing in this application can be applied to the power tool with a built-in battery pack. Details are not described herein again.

[0073] As Figure 3 and Figure 4 shown, the power tool 200a is a handheld power tool 200a. The main body housing 22 further includes a holding part 225, and the holding part 225 is used for the user to hold. The holding part 225 is connected to the accommodating part 221 and extends along the first straight line 101 direction from the accommodating part 221. The extending direction of the holding part 225 intersects with the extending direction of the accommodating part 221. The battery pack 100 is combined with the holding part 225 along the extending direction of the holding part 225. One end of the holding part 225 is connected to the accommodating part 221, and the other end forms the above-mentioned slot 224. The slot 224 is arranged in the holding part 225 and is formed by the holding part 225. Or rather, the slot wall forming the slot 224 constitutes a part of the holding part 225. When the user holds the power tool 200a, the user's hand will hold on the outer wall of the slot 224. When the battery pack 100 is combined with the tool main body 21, a part of the battery pack housing 11 is arranged in the slot 224 formed by the holding part 225, and a part of the battery cell unit 13 is also located in the slot 224 formed by the holding part 225. In this way, a part of the battery pack 100 is located in the holding part 225. When the user operates the power tool 200a, a part of the battery pack 100 will be located in the holding space surrounded by the user's palm and fingers.

[0074] It can be understood that as Figure 1 shown, when the power tool is the Figure 1 ratchet wrench 200c or the cutting machine 200d in

[0075] In this embodiment, the battery cells 13 are pouch-shaped cells, and the nominal voltage of the battery pack 100 is less than or equal to 9V. This reduces the size of the battery pack 100, allowing the grip 225 to remain relatively thin even when the battery pack 100 is partially positioned within the grip 225, making it easier for the user to operate the power tool 200a. Furthermore, the partial placement of the battery pack 100 within the grip 225 fully utilizes the space within the grip 225, thereby reducing the overall size of the power tool 200a and facilitating its miniaturization.

[0076] In some embodiments, the nominal voltage of the battery pack may also be less than or equal to 17V.

[0077] In this embodiment, the output power of the battery pack 100 is greater than or equal to 140W and less than or equal to 750W. The output power is calculated based on the rated current of the battery pack 100 and the nominal voltage of the battery pack 100. The rated current of the battery pack 100 can be the average operating current of the power tool 200a. Similarly, it can be understood that the output power of the battery pack 100 can also be considered as the operating power of the power tool 200a. For the power tool 200a, the average operating current is usually within a range, and the corresponding operating power can also vary within a certain range. For example, in this embodiment, the power tool 200a is an electric drill 200a, and the average current of the electric drill 200a is 21A to 48A, while the nominal voltage of the battery pack 100 is 8V. In this case, the operating power of the power tool 200a is 168W to 384W. In this case, the output power of the battery pack 100 can be considered to be 168W to 384W.

[0078] In this way, the nominal voltage of the battery pack 100 is 8V, and the battery pack 100 can meet the requirements of the electric tool 200a with higher power, thereby improving the adaptability of the battery pack 100.

[0079] In some embodiments, the output power of the battery pack 100 is greater than or equal to 140 W and less than or equal to 600 W. In some embodiments, the output power of the battery pack 100 is greater than or equal to 150 W and less than or equal to 550 W.

[0080] In some embodiments, the volume energy density of the battery pack 100 is greater than or equal to 100 mWh / cm 3, the nominal voltage is less than or equal to 9V. In this way, for a low-voltage battery pack 100, the battery pack 100 can provide a smaller volume and greater energy, so as to increase the energy of the battery pack 100 while meeting the requirements of the low-voltage platform of the power tool 200a, thereby increasing the battery life of the battery pack 100. Among them, the volume energy density is the ratio of the energy to the volume of the battery pack 100. The volume of the battery pack 100 can refer to the amount of three-dimensional (3D) space occupied by the entire battery pack 100, expressed in cubic units (for example, cubic centimeters (cm 3 ), or cubic millimeters (mm 3 The total volume of the battery pack 100 can be measured in various ways, including by measuring the volume of water displaced when the entire sealed battery pack 100 is submerged in water. Other methods commonly used by those skilled in the art may also be used to measure the volume of the battery pack 100.

[0081] In some embodiments, the volume energy density of the battery pack 100 is greater than or equal to 120 mWh / cm 3 In some embodiments, the volume energy density of the battery 100 is greater than or equal to 130 mWh / cm 3

[0082] In some embodiments, the gravimetric energy density of the battery pack 100 can be further defined as greater than or equal to 100 mWh / g. Gravimetric energy density is the ratio of the energy of the battery pack 100 to its weight. This can reduce the overall weight of the battery pack 100 while ensuring that the battery pack 100 provides sufficient battery life.

[0083] In some embodiments, the battery pack has a gravimetric energy density greater than or equal to 110 mWh / g. In some implementations, the battery pack has a gravimetric energy density greater than or equal to 120 mWh / g.

[0084] In this embodiment, the number of the battery cell units 13 included in the battery pack 100 is 2, and the volume of the battery pack 100 is less than or equal to 250 cm 3 The weight of the battery pack 100 is less than or equal to 200 g. In some embodiments, the weight of the battery pack is less than or equal to 180 g. In some embodiments, the weight of the battery pack is less than or equal to 150 g. In some embodiments, the weight of the battery pack is less than or equal to 140 g. In some embodiments, the volume of the battery pack is less than or equal to 200 cm 3 In some embodiments, the volume of the battery pack is less than or equal to 180 cm 3 In some embodiments, the volume of the battery pack is less than or equal to 150 cm 3 In some embodiments, the volume of the battery pack is less than or equal to 130 cm 3 .

[0085] In some embodiments, the capacity of the battery pack 100 is greater than or equal to 1.5 Ah and less than or equal to 5 Ah. The energy of the battery pack 100 is greater than or equal to 7 Wh and less than or equal to 9 Wh. This increases the total capacity of the battery pack 100 and improves the battery life of the battery pack 100.

[0086] In some embodiments, the ratio of the output power of the battery pack 100 to the volume of the battery pack 100 is greater than or equal to 1 W / cm³. The ratio of the output power of the battery pack 100 to the volume of the battery pack 100 can be defined as the power density. In this embodiment, the battery cells 13 are pouch-shaped cells, which improve the output power of the battery pack 100 while also reducing the volume of the battery pack 100. This allows the power tool 200a to meet operating power requirements while also reducing the volume of the battery pack 100 and increasing its battery life.

[0087] In some embodiments, a ratio of the output power of the battery pack 100 to the volume of the battery pack 100 is greater than or equal to 1.1 W / cm³.

[0088] like Figure 6b The figure shows a cross-sectional view of the portion of the battery pack 100 located in the slot 224 of the gripping portion 225 in a plane P perpendicular to the direction of the first straight line 101. Figure 6b As shown, the cross section of the battery pack 100 in the plane P perpendicular to the first straight line 101 has an outer contour 11a. Figure 6b The bold lines in the figure. The circumference of the outer contour 11a is greater than or equal to 10 cm and less than or equal to 14 cm. The circumference of the outer contour 11a can be measured by the rope winding method, and the length of a rope used to wrap a rope around the outer contour 11a can be defined as the circumference of the outer contour 11a. It is understandable that those skilled in the art can also use other common methods of measuring circumference. In this way, for the handheld power tool 200a, the battery pack 100 is relatively thin, so that the battery pack 100 is more suitable for inserting into the grip portion 225 without increasing the size of the grip portion 225, thereby effectively utilizing the space in the grip portion 225. In particular, for the power tool 200a with a smaller voltage platform, it is hoped that the size of the power tool 200a can be small enough while meeting the working power. In some embodiments, the circumference of the outer contour 11a is greater than or equal to 11 cm and less than or equal to 13.5 cm.

[0089] like Figure 6bAs shown, the area of ​​the outer contour 11a of the cross section of the battery pack 100 in a plane perpendicular to the first straight line 101 is greater than or equal to 8 cm² and less than or equal to 14 cm². In this way, the size of the battery pack 100 is smaller and more convenient for the user to hold, and the size of the battery pack 100 is not too small to be convenient for arranging internal components such as the battery cell unit 13 and the circuit board assembly 15. The area can be measured using measurement methods commonly used by those skilled in the art, such as the grid method. The grid method is to simulate the outer contour 11a and divide it into several squares, then calculate the area of ​​each square, and then sum the areas of several squares to approximately obtain the area of ​​the outer contour 11a. Of course, those skilled in the art may also use other measurement methods, as long as they can approximately estimate the area of ​​the outer contour 11a. In some embodiments, the area of ​​the outer contour of the cross section of the battery pack in a plane perpendicular to the first straight line is greater than or equal to 10 cm² and less than or equal to 12.5 cm².

[0090] like Figure 13 The diagram shows a cross-sectional view of the grip portion 225 and the battery pack 100 positioned within the grip portion 225, taken within plane P. The inner bold line in the cross-sectional view represents the outer contour 11a of the battery pack 100, while the outer bold line represents the outer contour 225a of the grip portion 225. In this embodiment, because the outer contour 11a of the cross section of the battery pack 100 within plane P is relatively small, the outer contour 225a of the cross section of the grip portion 225 within plane P can be designed to be correspondingly smaller. For example, the circumference of the outer contour 225a of the cross section of the grip portion 225 within plane P, which is perpendicular to the first line 101, can be greater than or equal to 12.5 cm and less than or equal to 16 cm. Alternatively, the area of ​​the outer contour 225a of the cross section of the grip portion 225 within plane P, which is perpendicular to the first line 101, can be greater than or equal to 13 cm² and less than or equal to 18 cm². This not only reduces the grip portion 225 from being too thin, thereby reducing the grip contact surface, but also prevents the grip portion 225 from being too thick and uncomfortable to hold. In some implementations, the perimeter of the outer contour 225a of the cross section of the grip portion 225 in the plane P perpendicular to the first straight line 101 is greater than or equal to 13 cm and less than or equal to 15 cm. In some embodiments, the area of ​​the outer contour 225a of the cross section of the grip portion 225 in the plane P perpendicular to the first straight line 101 is greater than or equal to 14 cm² and less than or equal to 16.5 cm².

[0091] like Figure 6bAs shown, the dimension L1 of the cross section of the battery pack 100 in the width direction perpendicular to the first line 101 within plane P is greater than or equal to 3.7 cm and less than or equal to 4.7 cm. This allows the width of the grip 225 to be suitable for a user to hold comfortably and stably. The dimension L2 of the cross section of the battery pack 100 in the thickness direction, perpendicular to the first line 101 and perpendicular to the width direction, within plane P is greater than or equal to 2.7 cm and less than or equal to 3.7 cm. The cross section dimension in the width direction is also greater than the dimension in the thickness direction. For example, the ratio of the cross section dimension L1 in the width direction to the cross section dimension L2 in the thickness direction is greater than or equal to 1.1 and less than or equal to 1.5. In some embodiments, the ratio of the cross section dimension L1 in the width direction to the cross section dimension L2 in the thickness direction is greater than or equal to 1.2 and less than or equal to 1.5. This allows the cross section of the battery pack 100 to be substantially elliptical, facilitating the design of the grip 225 that accommodates the battery pack 100 to also be approximately elliptical. In some embodiments, a dimension L1 of a cross section of the battery pack 100 in the plane P in a width direction perpendicular to the first straight line 101 is greater than or equal to 3.9 cm and less than or equal to 4.5 cm, and a dimension L2 of a cross section of the battery pack 100 in the plane P in a thickness direction perpendicular to the first straight line 101 and perpendicular to the width direction is greater than or equal to 2.9 cm and less than or equal to 3.5 cm.

[0092] like Figure 13 As shown, the cross-section dimension L3 of the grip portion 225 in the width direction perpendicular to the first line 101 within plane P is greater than or equal to 4.5 cm and less than or equal to 5.3 cm. This allows the width of the grip portion 225 to be adapted for a comfortable and stable grip by the user. The cross-section dimension L4 of the grip portion 225 in the thickness direction, perpendicular to the first line 101 and perpendicular to the width direction, within plane P is greater than or equal to 3.5 cm and less than or equal to 4.5 cm. The cross-section dimension in the width direction is also greater than the dimension in the thickness direction. For example, the ratio of the cross-section dimension L1 in the width direction to the cross-section dimension L2 in the thickness direction is greater than or equal to 1.1 and less than or equal to 1.5. In some embodiments, the ratio of the cross-section dimension L1 in the width direction to the cross-section dimension L2 in the thickness direction is greater than or equal to 1.2 and less than or equal to 1.5. This allows the cross-section of the grip portion 225 to be substantially elliptical, allowing the user to comfortably operate the power tool 200 a and taking into account the ergonomics of the power tool 200 a.

[0093] like Figures 4 to 7bAs shown, the battery cell unit 13 is a pouch-shaped battery cell, and the pouch-shaped battery cell extends within the extension plane P2. Alternatively, it can be understood that the plane where the largest surface of the pouch-shaped battery cell is located is the extension plane P2. The extension plane of the battery cell unit 13 is basically parallel to the first straight line 101. The extension direction of the gripping portion 225 is the first straight line 101, and the gripping portion 225 has the largest size in the direction of the first straight line 101, while the plane where the largest surface of the battery cell unit 13 is located is the extension plane. In this way, by making most of the battery cell units 13 located in the gripping portion 225 and the extension plane basically consistent with the first straight line 101, the overall volume of the gripping portion 225 and the battery pack 100 can be reduced, and the battery cell units 13 can fully utilize the space formed by the gripping portion 225 in the direction of the first straight line 101.

[0094] like Figure 7b As shown, the battery cell 13 is substantially rectangular, with a length L6 of the battery cell 13 greater than or equal to 5.7 cm and less than or equal to 6.7 cm, and a width L7 of the battery cell 13 greater than or equal to 2.7 cm and less than or equal to 3.7 cm. The length L6 of the battery cell 13 is the dimension of the battery cell 13 along the first straight line 101, and the width L7 of the battery cell 13 is the dimension of the battery cell 13 along a direction perpendicular to the first straight line 101 and parallel to the extended plane of the battery cell 13. In some embodiments, the length L6 of the battery cell 13 is greater than or equal to 5.9 cm and less than or equal to 6.9 cm, and the width L7 of the battery cell 13 is greater than or equal to 2.9 cm and less than or equal to 3.9 cm.

[0095] like Figures 6a to 12b As shown, the circuit board assembly 15 is used to control the charge and discharge of the battery pack 100 and protect the battery pack 100. The circuit board assembly 15 is disposed in the battery pack housing 11. A plurality of electronic components are disposed on the circuit board assembly 15.

[0096] The circuit board assembly 15 includes a power management board 151. This board manages the relationships between the multiple battery cells 13 and controls the parameters and processes of charging and discharging the battery pack 100. The plane extending from the power management board 151 is substantially parallel to the plane extending from the battery cells 13 within the grip 225. This allows the power management board 151 and the battery cells 13 to fully utilize the space within the ellipse.

[0097] The power management board 151 is stacked on the side of the battery cell unit 13 located within the grip portion 225. The extended plane of the power management board 151 is also parallel to the first straight line 101 of the grip portion 225. It should be noted that the side of the battery cell unit 13 can be understood as the area of ​​the battery cell unit 13 located on both sides of the extended plane. In this embodiment, both battery cell units 13 are arranged parallel to the power management board 151.

[0098] In this embodiment, the battery cell units 13 located at least partially within the grip portion 225 are defined as a first group of battery cells 13a. Along the first straight line 101, the first group of battery cells 13a includes a first end 13b and a second end 13c. The first end 13b is the end of the first group of battery cells 13a closest to the host interface 223, while the second end 13c is opposite the first end 13b and further away from the host interface 223. When the battery pack 100 is coupled to the grip portion 225, the first end 13b is located within the grip portion 225, while the second end 13c is located outside the grip portion 225. In other words, when the battery pack 100 is coupled to the grip portion 225, the first end 13b is located within the slot 224, while the second end 13c is located outside the slot 224. The battery pack interface 12 is located at the first end 13b of the first group of battery cells 13a. Thus, when the battery pack 100 is inserted into the slot 224, the battery pack interface 12 first enters the slot 224. When the battery pack 100 reaches the bottom of the slot 224, the battery pack interface 12 at the first end 13b can first connect with the host interface 223 at the bottom of the slot. This ensures a stable connection between the battery pack interface 12 and the host interface 223 when the battery pack 100 is inserted into the slot. This not only ensures a more stable connection between the battery pack 100 and the tool host 21, but also protects the host interface 223 and the battery pack interface 12 from external interference.

[0099] The circuit board assembly 15 also includes a terminal circuit board 152. The battery pack interface 12 includes at least one battery pack 100 terminal. For example, the battery pack interface 12 may include a positive terminal 152a, a negative terminal 152b, a detection terminal 152c, a communication terminal 152d, and other terminals. The terminal circuit board 152 is used to support and mount the battery pack 100 terminals, namely, the positive terminal 152a, the negative terminal 152b, the detection terminal 152c, and the communication terminal 152d. The positive and negative terminals 152a, 152b are connected to the battery cell units 13. In this embodiment, the terminal circuit board 152 is positioned at the first end 13b of the first group of battery cells 13a. This facilitates placement of the battery pack interface 12 near the bottom of the slot 224 of the battery pack 100. This also reduces the size of the battery pack 100 in a plane P perpendicular to the first straight line 101, facilitating the design of a grip 225 that is comfortable for the user.

[0100] The terminal circuit board 152 extends substantially perpendicular to the first straight line 101, thereby fully utilizing the space at the first end 13b of the first group of battery cells 13a. It is understood that in other embodiments, the terminal circuit board 152 may also be tilted relative to the first straight line 101.

[0101] In this embodiment, the extension plane P2 of the battery cell units 13 can be defined as the first plane. The power management board 151 is provided separately from the terminal circuit board 152. The power management board 151 is provided on the side of the first group of battery cells 13a and parallel to the first plane. As is known, the terminals of the battery pack 100 typically have a certain length. Therefore, placing the battery pack 100 terminals at the ends of the battery cell units 13 rather than on the sides can reduce the size of the battery pack 100 within the plane P perpendicular to the first straight line 101, fully utilizing the space of the grip portion 225 in the direction of the first straight line 101. The extension plane of the terminal circuit board 152 is not parallel to the extension plane of the power management board 151. For example, in this embodiment, the extension plane of the terminal circuit board 152 is substantially perpendicular to the extension plane of the power management board 151. The terminal circuit board 152 is located at the ends of the battery cell units 13 stacked along the stacking direction 102. Thus, the battery pack 100 terminals are located at the ends of the long sides of the rectangle.

[0102] like Figure 6b 、 6c and Figure 10 As shown, the power management board 151 has components 151a, which are mounted on the side of the power management board 151 away from the battery cell unit 13. The volume of the component 151a is greater than or equal to 100mm 3 Component 151a is also positioned on the central axis 103 in the length or width direction of the power management board 151. The dimension L5 of component 151a in a direction perpendicular to the extension plane is greater than or equal to 3 mm. The length direction is aligned with the direction of the first straight line 101 and is also perpendicular to the width and thickness directions. For example, in this embodiment, component 151a is positioned on the central axis 103 in the width direction of the power management board 151. This allows full utilization of the bulged space in the center of the ellipse, thereby increasing the volumetric energy density of the battery pack 100. In this embodiment, the dimension L5 of component 151a in a direction perpendicular to the extension plane is greater than or equal to 3 mm, resulting in a relatively high height of component 151a. If component 151a is mounted elsewhere on the power management board 151, the size of the battery pack 100 will be larger. Heightened components 151a may be, for example, capacitors, inductors, and other devices.

[0103] like Figures 8 to 12bAs shown, the cell holder 14 is used to support the cell unit 13. In this embodiment, the cell holder 14 includes a first support portion 141 and a second support portion 142. The first support portion 141 is provided on four end surfaces of the cell unit 13.

[0104] The first support portion 141 surrounds the four end surfaces of the cell unit 13 to form a cell accommodating cavity 112. One side of the cell accommodating cavity 112 is open to improve the heat dissipation effect of the cell unit 13, and the other side of the cell accommodating cavity 112 is provided with a second support portion 142.

[0105] The second support portion 142 is provided on one side of the battery cell unit 13. The first support portion 141 includes a terminal board support portion 141a provided at the first end 13b of the battery cell unit 13. The outer side of the terminal board support portion 141a, facing away from the battery cell unit 13, supports the terminal circuit board 152. The inner side of the second support portion 142 is adjacent to the surface of the battery cell unit 13, while the outer side of the second support portion 142 is used to mount the power management board 151. The outer side of the second support portion 142 may be formed with a groove 142a and a clamping portion 142b. The groove 142a is used to accommodate at least a portion of the power management board 151, and the clamping portion 142b is used to secure the power management board 151. A detection device 151b is also provided on the side of the power management board 151 near the second support portion 142. The detection device 151b and the aforementioned components 151a are respectively provided on different sides of the power management board 151. The detection device 151b is used to detect the temperature of the battery cell 13. The detection device 151b is arranged on the side of the power management board 151 close to the battery cell 13 to make temperature detection more accurate. The second support portion 142 is also provided with a through hole 142c, which connects the spaces on both sides of the second support portion 142. The detection device 151b is arranged on the power management board 151 at a position directly opposite the through hole 142c. The detection device 151b can be located within the through hole 142c, or even pass through the through hole 142c and be located on the side of the second support portion 142 close to the battery cell 13, so that the distance between the detection device 151b and the surface of the battery cell 13 is closer. For example, the detection device 151b can be arranged in contact with the surface of the battery cell 13, so that the temperature of the battery cell 13 can be more accurately detected.

[0106] like Figure 3 、 Figure 8 and Figure 9As shown, the battery pack housing 11 includes a first housing portion 111 and a second housing portion 112, which are detachably connected along a first straight line 101. This facilitates installation of the battery pack 100. The first housing portion 111 forms a first barrel portion 111a, which extends along the first straight line 101. The end of the first barrel portion 111a closest to the second housing portion 112 is open, and the end of the first barrel portion 111a remote from the second housing portion 112 houses the battery pack 100 terminals. The end of the first barrel portion 111a remote from the second housing portion 112 is partially closed and defines a through-hole 142c for passing a tool terminal or a battery pack 100 terminal. The second housing portion 112 forms a second barrel portion 112a, which, when mated with the first barrel portion 111a, forms a cell-receiving cavity 112 for accommodating the battery cells 13. The second barrel portion 112a is open at one end near the first barrel portion 111a and at least partially closed at the other end. The dimension of the first housing portion 111 along the direction of the first straight line 101 is larger than the dimension of the second housing portion 112 along the direction of the first straight line 101 .

[0107] The outer wall of the second barrel portion 112a also forms a locking structure 112b. This locking structure 112b mates with the mating structure 226 on the main body housing 22 to lock the battery pack 100 when it is coupled to the main body housing 22. This prevents the battery pack 100 from detaching from the power tool 200a due to vibration and ensures the stability of the connection between the battery pack interface 12 and the tool interface. Specifically, the locking structure 112b is a buckle.

[0108] like Figure 2 、 Figure 5 as well as Figure 8 As shown, the battery pack 100 also includes a power display assembly 161 and a first interface 162. The first interface 162 is used to connect to an external charging device to charge the power tool 200a. The power display assembly 161 is used to display the remaining power of the battery pack 100. The power display assembly 161 and the first interface 162 are both located on the side of the power management board 151 away from the battery cell units 13. The first interface 162 is also configured so that the charging device can be connected to the first interface 162 in a direction parallel to the power management board 151 and perpendicular to the first line 101.

[0109] The first interface 162 is at least partially disposed within the battery pack housing 11, specifically within the second housing portion 112. When the battery pack 100 is coupled to the tool body, the first interface 162 is located outside the body. This allows the user to charge the battery pack 100 without removing it. In this embodiment, when the battery pack 100 is coupled to the grip portion 225, the first interface 162 is located outside the grip portion 225.

[0110] Among them, the first interface 162 is a USB charging interface, which can not only be used for charging, but also output power to power other electrical devices. In some embodiments, the first interface 162 is a type-c interface. Setting the first interface 162 as a type-c interface allows the battery pack 100 to adapt to more types of charging devices. The charging device can be a dedicated charger manufactured by the manufacturer of the battery pack 100 to match the battery pack 100, or it can be a common type-c universal charger on the market. In this embodiment, the battery cell unit 13 in the battery pack 100 is a bag-shaped battery cell, which makes the volume energy density of the battery pack 100 larger, so that the battery pack 100 can not only power the power tool 200a, but also allow the battery pack 100 to have a sufficiently long battery life to charge other electrical devices. In other words, the first interface 162 can also output power so that the battery pack 100 can power other electrical devices.

[0111] like Figure 14 The charging assembly 300 shown includes: a battery pack 100 and a first charger 31. The battery pack 100 is Figures 1 to 3 The battery pack 100 in the battery pack 100. The first charger 31 is adapted to the first interface 162, and the first charger 31 includes a first charging interface 311 that is detachably connected to the first interface 162. The first charger 31 is a Type-C charger, and the first charging interface 311 is a Type-C interface.

[0112] In some embodiments, the first charger 31 is a commercially available Type-C universal charger that can charge a mobile phone. The charging power of the first charger 31 is less than or equal to 15W.

[0113] Alternatively, in some embodiments, the charging power of the first charger 31 is greater than or equal to 15 W. Alternatively, the charging power of the first charger 31 is greater than or equal to 18 W. In this way, the charging time of the battery pack 100 can be shortened.

[0114] When the battery pack 100 is installed in the power tool 21, the first interface 162 is also configured to allow access to power for charging the battery pack 100. This means that the first charger 31 can charge the battery pack 100 while the battery pack 100 is installed. This allows the user to charge the battery pack 100 directly through the first charger 31 without removing the battery pack 100. Alternatively, while the power tool 200a is in operation, the first interface 162 allows access to power for charging the battery pack 100. This allows the user to charge the battery pack 100 while the power tool 200a is in operation, enabling the user to charge the battery pack 100 while the tool is still in operation.

[0115] In some embodiments, the battery pack interface 12 can also be configured as a charging interface, through which it is connected to an external charging device to charge the battery pack 100. Figure 14 As shown, the charging assembly 300 also includes a second charger 32, which includes a second charging port 321 that is detachably connected to the battery pack port 12 for charging the battery pack 100. In other words, the battery pack port 12 can be configured to both output power to charge the power tool 200a and receive power to charge the battery cell unit 13. The charging power of the battery pack port 12 is greater than or equal to 30W.

[0116] The second charger 32 is formed with a charging interface 322, to which the battery pack 100 can be coupled. The charging interface 322 is also configured with charging terminals 323 that connect to the terminals of the battery pack 100. The charging interface 322 can be similar in structure to the slot 224 of the grip 225 described above. Thus, when the battery pack 100 is coupled to the second charger 32, the battery pack interface 12 is electrically connected to the second charging interface 321. The charging power of the second charger 32 is greater than or equal to 30W. In some embodiments, the charging power of the second charger 32 is greater than or equal to 40W.

[0117] like Figure 14 and Figure 15 As shown, the charging assembly 300 may further include a controller 33. In this embodiment, the controller 33 is disposed in the battery pack 100. The controller 33 is configured to prevent power from being connected to the battery pack interface 12 when the first charger 31 is connected to the battery pack 100. In other words, when the first charger 31 is charging the battery pack 100, the second charger 32 is prevented from charging the battery pack 100.

[0118] In other embodiments, the controller 33 may also be configured to prevent power from being connected to the first interface 162 when the second charger 32 is connected to the battery pack 100. In other words, the first charger 31 is prevented from charging the battery pack 100 when the second charger 32 is charging the battery pack 100.

[0119] In some other embodiments, the charging assembly 300 may only include the battery pack 100 and the first charger 31 . That is, the battery pack 100 can only be charged by the first charger 31 .

[0120] like Figure 16 Another battery pack 400 is shown, which is Figure 5 The battery pack 100 shown is basically the same, the main difference is that it also has a wireless charging device 401. Figure 5The structure of the battery pack 100 in the embodiment can be applied to the embodiment, and the details will not be repeated. The following mainly introduces the structure of the embodiment and the Figure 5 The differences between the embodiments shown.

[0121] like Figure 16 Shown to Figure 19 As shown, wireless charging device 401 is used to connect to power to charge battery cells 403. It includes a receiving coil 402, which is arranged at one end of the stacked battery cells 403 away from the battery pack interface 404. In other words, receiving coil 402 is arranged at the second end of the first group of battery cells 405. Receiving coil 402 is electrically connected to a power management board 406.

[0122] like Figure 17 As shown, another charging combination 45 is formed by a battery pack 400 and a wireless charging device 43. The wireless charging device 401 is connected to the power management board 406, and the wireless charging device 401 cooperates with the wireless charging device 43 so that the wireless charging device 43 charges the battery cell 403.

[0123] The wireless charging device 43 includes: a power output module and a power interface 432. The power output module is used to cooperate with the wireless charging device 401. Specifically, the power output module includes a transmitting coil 433, which matches the receiving coil 402. The transmitting coil 433 and the receiving coil 402 can realize energy transfer. The power interface 432 is used to connect to an external power device. For example, the power interface 432 can be connected to the mains power grid. The maximum charging power of the wireless charging device 401 is less than or equal to 15W. In this way, the battery pack 400 of this embodiment can be charged using conventional wireless charging devices 43 on the market. For example, some wireless charging devices 43 that charge mobile phones can also be used to charge the battery pack 400 of this embodiment. In this way, when users purchase the battery pack 400 of this embodiment, they do not need to purchase a wireless charging device 43 separately. Instead, they can use the wireless charging device 43 already at home to charge the battery pack 400, reducing the user's usage cost.

[0124] In some embodiments, the maximum charging power of the wireless charging device 401 is greater than or equal to 15W. This allows the battery pack 400 to be fully charged quickly. Users can purchase a dedicated wireless charging device 43 for charging. The wireless charging device 43 can charge the battery pack 400 at a power greater than or equal to 20W.

[0125] In another embodiment of the battery pack 400, the battery pack 400 and Figure 16The battery pack 400 shown is substantially the same, with the main difference being that the battery cell 403 is a cylindrical battery cell. Thus, the wireless charging device 401 can cooperate with the wireless charging device 43 to charge the cylindrical battery cell.

[0126] like Figure 17 and Figure 18 As shown, battery pack 400 includes a positioning structure 407 that allows it to be positioned at the charging position of wireless charging device 43. In this embodiment, positioning structure 407 can be a first magnetic device 408, and the corresponding wireless charging device 43 is equipped with a corresponding second magnetic device 434 at the charging position. The cooperation between first magnetic device 408 and second magnetic device 434 can ensure that battery pack 400 is attracted to the charging position, thereby facilitating the user to accurately position battery pack 400 and ensuring charging stability.

[0127] like Figure 19 As shown, an external fan 44 can also be adsorbed by the first magnetic device 408. The external fan 44 can cooperate with the air duct structure on the battery pack 400 to dissipate heat for the battery pack 400. The external fan 44 is provided with a third magnetic device 441 that cooperates with the first magnetic device 408.

[0128] In some embodiments, the positioning structure may also be a snap structure, and the battery pack is positioned at the charging position of the wireless charging device through the snap structure.

[0129] In some embodiments, the positioning structure can also be a specific positioning protrusion or groove on the surface of the battery pack. The corresponding wireless charging device is provided with a corresponding positioning groove or protrusion. The battery pack is positioned in the charging position through the cooperation of the protrusion and the groove.

[0130] In some embodiments, the positioning structure may also be an outer shape formed on the surface of the battery pack itself, and the wireless charging device may be formed with a corresponding matching outer shape that can cooperate with the outer shape to position the battery pack at the charging position.

[0131] like Figure 20 Another charging assembly 500 shown includes a first battery pack 501, a second battery pack 502 and a wireless charging device 503. The first battery pack 501 can be connected to the wireless charging device 503. Figure 16 The second battery pack 502 can also be connected to the wireless charging device 503. Figure 16The wireless charging device 503 is similar to the battery pack in FIG. It includes a second battery cell unit and a second wireless charging device capable of charging the second battery cell unit. The second battery cell unit is a pouch-shaped battery cell, and its specific structure is not further described. The wireless charging device 503 is configured to charge the first battery pack 501 and the second battery pack 502 in a predetermined sequence. This allows one of the first battery packs 501 to be fully charged before the other is charged, making it easier for the user to use the first battery pack 501 in a timely manner.

[0132] In some embodiments, the wireless charging device 503 can also charge the first battery pack 501 and the second battery pack 502 simultaneously. In this way, when a tool host that requires two battery packs is operating, the first battery pack 501 and the second battery pack 502 can be used in a timely manner. Alternatively, when two tool hosts need to operate, the first battery pack 501 and the second battery pack 502 can be used separately in a timely manner.

[0133] In some embodiments, the wireless charging device 503 may also first charge the battery pack with lower power among the first battery pack 501 and the second battery pack 502, and then when the battery pack with lower power is charged to the same power as the other battery pack, the first battery pack 501 and the second battery pack 502 are charged simultaneously.

[0134] In this embodiment, both the first and second battery cells are pouch-shaped cells. In other embodiments, the first battery cell may be a pouch-shaped cell, while the second battery cell may be a cylindrical cell. Alternatively, in other embodiments, both the first and second battery cells may be cylindrical cells.

[0135] In this embodiment, the wireless charging device 503 can charge the first battery pack 501 and the second battery pack 502. It is understandable that in other embodiments, the wireless charging device 503 can also charge more battery packs.

[0136] In this embodiment, the wireless charging device 503 has a first charging position for charging the first battery pack 501, and a second charging position for charging the second battery pack 502. It is understood that in other embodiments, the wireless charging device 503 is further provided with multiple charging positions. Multiple charging positions eliminate the need for placing the first battery pack 501 and the second battery pack 502 in specific locations for charging. Instead, they can be charged at any location within a charging area of ​​the wireless charging device 503, thereby improving charging convenience.

[0137] In another embodiment of the power tool, the power tool includes: a tool main body, a first battery pack and a second battery pack. The tool main body includes: an output member, a motor, a first tool interface and a second tool interface. The output member is used to output power, and the motor is used to drive the output member to move. The first tool interface is used to be detachably connected to the first battery pack, and the second tool interface is used to be detachably connected to the second battery pack. The first battery pack can be Figure 5 ,or Figure 16 The specific structure of the battery pack is not described in detail. The second battery can be Figure 5 or Figure 16 The specific structure of the battery pack is not described here. In this embodiment, the first battery pack includes: a first battery pack housing and a first battery cell unit, wherein the first battery cell unit is disposed within the first battery pack housing. The second battery pack includes a second battery pack housing and a second battery cell unit within the second battery pack housing. The first battery cell unit is a pouch-shaped battery cell, and the second battery cell unit is also a pouch-shaped battery cell. This allows the volumetric energy density of both the first and second battery packs to be set relatively high, thereby improving the battery life of the power tool.

[0138] like Figure 21 and Figure 25 As shown, the present application also provides another battery pack 600 suitable for a tool host 600a. Figure 5 The battery pack 100 in the embodiment can be adapted to the same tool host 21, the main difference being the number of battery cells 601 contained in the battery pack 600. For example, Figure 5 In the battery pack 100 shown, the number of battery cells 601 is 2, and two battery cells 601 are connected in series, so that the two battery cells 601 constitute a first group of battery cells 602, also called a 1P group of battery cells. In this embodiment, the number of battery cells 601 included in the battery pack 600 is 4. The four battery cells 601 constitute a 2P battery group, which can be defined as follows: Figure 5 The two battery cells 601 with the same battery cells 601 are the first group of battery cells 602, and the other two battery cells 601 are the second group of battery cells 603. In this embodiment, the two battery cells 601 in the first group of battery cells 602 are connected in series, the two battery cells 601 in the second group of battery cells 603 are connected in series, and the first group of battery cells 602 and the second group of battery cells 603 are connected in parallel, so that the four battery cells 601 constitute a 2P battery cell group. Alternatively, in some embodiments, the two battery cells 601 in the first group of battery cells 602 are connected in parallel, the two battery cells 601 in the second group of battery cells 603 are connected in parallel, and the first group of battery cells 602 and the second group of battery cells 603 are connected in series. In this way, it can also be considered that the four battery cells 601 constitute a 2P battery cell group.

[0139] In this embodiment, when the battery pack 600 is coupled to the tool main body 600 a , the first group of battery cells 602 are at least partially disposed within the grip portion 604 , and the second group of battery cells 603 are located outside the grip portion 604 .

[0140] For the convenience of explanation, in this embodiment, the battery cell unit 601 in the first group of battery cells 602 can also be defined as the first battery cell unit 605, and the battery cell unit 601 in the second group of battery cells 603 can be defined as the second battery cell unit 606. Among them, the first battery cell unit 605 and the second battery cell unit 606 are both bag-shaped battery cells. The first battery cell unit 605 is partially or completely located in the holding portion 604, and the second battery cell unit 606 is located outside the holding portion 604. The extension of the first battery cell unit 605 is parallel to the first straight line 607. The extension plane of the second battery cell unit 606 is perpendicular to the first straight line 607. The extension plane of the second battery cell unit 606 is perpendicular to the extension plane of the first battery cell unit 605. The arrangement of the circuit board assembly 608 and the first group of battery cells 602 is the same as Figure 5 The main difference is that the second group of battery cells 603 is vertically arranged at the first end of the first group of battery cells 602 away from the battery pack interface 609.

[0141] The battery pack housing 610 includes a first housing portion 611 and a second housing portion 612. Figure 3 Similar to the battery pack 100 in FIG. 1 , the first housing portion 611 and the second housing portion 612 form a detachable connection. The second housing portion 612 includes a left housing portion 613 and a right housing portion 614, which are connected to form a storage space for the second group of battery cells 603. The battery pack housing 610 is generally T-shaped, thereby increasing the capacity of the battery pack 600 while reducing the volume of the battery pack 600. Alternatively, in some embodiments, the battery pack housing 610 can also be generally L-shaped.

[0142] like Figure 26 As shown, it can be understood that in some embodiments, the first group of battery cells 701 and the second group of battery cells 702 can be arranged along the first straight line 703, that is, the second battery cell unit 704 is arranged below the first battery cell unit 705.

[0143] 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. An electric tool comprising: A tool host, comprising an output member for outputting power, a motor for driving the output member to move, and a host housing accommodating at least a portion of the motor; a battery pack, adapted to be detachably connected to the main body housing to power the motor; The tool host includes a host interface, the battery pack includes a battery pack interface that cooperates with the host interface, and when the battery pack is installed on the tool host, the host interface and the battery pack interface are connected, and the battery pack further includes: Battery pack housing; A battery cell unit, disposed in the battery pack housing and electrically connected to the battery pack interface; The battery cell unit is a bag-shaped battery cell, at least part of at least one of the battery cell units is stacked along a stacking direction, and the volume energy density of the battery pack is greater than or equal to 100mWh / cm 3 , the nominal voltage of the battery pack is less than or equal to 9V.

2. The electric tool according to claim 1, wherein: The volume energy density of the battery pack is greater than or equal to 120mWh / cm 3 .

3. The electric tool according to claim 1, wherein: The weight energy density of the battery pack is greater than or equal to 100 mWh / g.

4. The electric tool according to claim 1, wherein: The nominal voltage of the battery pack is 8V.

5. The electric tool according to claim 1, wherein: The number of the battery cell units in the battery pack shell is 2, and the weight of the battery pack is less than or equal to 200g.

6. The electric tool according to claim 1, wherein: The capacity of the battery pack is greater than or equal to 1.5 Ah.

7. The electric tool according to claim 1, wherein: The number of the battery cell units in the battery pack shell is 4, wherein the 4 battery cell units constitute a 2P battery cell group.

8. The electric tool according to claim 1, wherein: The main body housing includes: a motor accommodating portion for accommodating a motor and a gripping portion for a user to hold. When the battery pack is coupled to the tool main body, at least a portion of the battery cell unit is located within the gripping portion.

9. A battery pack suitable for an electric tool, comprising: a battery pack housing having a coupling portion for connecting to the power tool; The battery cell unit is arranged in the battery pack shell; A battery pack interface, used to output power to the power tool, the battery pack interface being electrically connected to the battery cell unit; The battery pack is characterized in that the battery cell unit is a bag-shaped battery cell, at least part of the plurality of battery cell units are stacked along a stacking direction, the battery pack interface is arranged at the end of the plurality of battery cell units stacked along the stacking direction, and the volume energy density of the battery pack is greater than or equal to 100mWh / cm 3 , the nominal voltage of the battery pack is less than or equal to 9V.

10. An electric tool comprising: A tool host, comprising an output member for outputting power, a motor for driving the output member to move, and a host housing accommodating at least a portion of the motor; a battery pack, adapted to be detachably connected to the main body housing to power the motor; The tool host includes a host interface, the battery pack includes a battery pack interface that cooperates with the host interface, and when the battery pack is installed on the tool host, the host interface and the battery pack interface are connected, and the battery pack further includes: Battery pack housing; A battery cell unit, disposed in the battery pack housing and electrically connected to the battery pack interface; The battery cell unit is a pouch-shaped battery cell, the weight energy density of the battery pack is greater than or equal to 100mWh / g, and the nominal voltage of the battery pack is less than or equal to 9V.

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