A chain saw

Abstract

This application relates to a chainsaw, including a housing, a cutting assembly, a motor, and a battery pack housing. The cutting assembly is mounted in the housing and includes a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain. The motor is mounted in the housing and configured to drive the saw chain to move around the guide plate. The battery pack housing is configured to house a battery pack, which is configured to provide power to at least the motor. The rated input power of the motor is greater than or equal to 1200W and less than or equal to 5500W. The ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 778W / Kg, where the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, saw chain, and battery pack installed. The chainsaw of this application can balance the requirements of cutting performance and lightweight design.

Description

[0001] This application claims priority to Chinese patent application No. 202411388067.7, filed on September 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power tool technology, and more particularly to a chainsaw. Background Technology

[0003] Chainsaws, as a type of garden power tool, are widely used in various settings such as homes and gardens. A chainsaw typically consists of a housing, a guide plate, a chain mounted around the guide plate, and a motor housed within the housing. During operation, the chainsaw chain rotates around the guide plate under the drive of the motor to cut the target object. Users have different performance requirements for chainsaws under different working conditions, and balancing cutting performance with ease of use has always been a pressing technical challenge. Utility Model Content

[0004] The purpose of this application is to provide a chainsaw that can balance the requirements of cutting performance and lightweight design.

[0005] The technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing, configured to drive the saw chain to move around the guide plate; and a battery pack housing configured to house a battery pack, the battery pack being configured to provide electrical energy to at least the motor; the rated input power of the motor being greater than or equal to 1200W and less than or equal to 5500W; the ratio of the rated input power of the motor to the bare weight of the chainsaw being greater than or equal to 778W / Kg, wherein the bare weight of the chainsaw is the weight of the chainsaw in the state without the guide plate, the saw chain, and the battery pack assembled.

[0007] In one embodiment, the housing includes a main housing that at least accommodates the motor; the chainsaw also includes a main handle disposed along the length extension direction of the chainsaw; the main handle is disposed above the main housing in the height extension direction of the chainsaw; the orthographic projection of the main housing on a reference plane P includes the leading edge of the main housing projection near the cutting assembly in the length extension direction L of the chainsaw; the orthographic projection of the motor on the reference plane P includes the leading edge of the motor projection near the cutting assembly and the trailing edge of the motor projection away from the cutting assembly in the length extension direction L of the chainsaw; in the length extension direction L of the chainsaw, the orthographic projection of the main handle on the reference plane P is at least partially located between the leading edge of the main housing projection and the trailing edge of the motor projection; wherein, the reference plane P is a plane perpendicular to the height extension direction H; the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than 800 W / Kg.

[0008] In one embodiment, the rated input power of the motor is greater than or equal to 1800W and less than or equal to 5500W; and / or, the bare weight of the chainsaw is less than or equal to 3.5Kg.

[0009] In one embodiment, the rated input power of the motor is greater than or equal to 2100W and less than or equal to 5500W.

[0010] In one embodiment, the bare weight of the chainsaw is less than 3 kg.

[0011] In one embodiment, the ratio of the rated output power of the motor to the bare weight of the chainsaw is greater than or equal to 600 W / kg.

[0012] In one embodiment, the rated output power of the motor is greater than or equal to 1600W.

[0013] In one embodiment, the ratio of the rated input power of the motor to the bare volume of the chainsaw is greater than or equal to 0.162 W / cm². 3 .

[0014] In one embodiment, the ratio of the rated output power of the motor to the bare volume of the chainsaw is greater than or equal to 0.125 W / cm². 3 .

[0015] In one embodiment, the total weight of the chainsaw is greater than or equal to 1.8 kg and less than or equal to 4.5 kg. The total weight of the chainsaw is the weight of the chainsaw without the guide plate and the saw chain and with the battery pack installed.

[0016] In one embodiment, the ratio of the rated output power of the motor to the total weight of the chainsaw is greater than or equal to 385 W / kg.

[0017] In one embodiment, the ratio of the rated input power of the motor to the total weight of the chainsaw is greater than or equal to 467 W / kg.

[0018] In one embodiment, the rated output power of the battery pack is greater than 2100W; and / or, the weight of the battery pack is less than 1.8Kg.

[0019] In one embodiment, the battery pack includes a plurality of cells configured as omni-tab cells.

[0020] In one embodiment, the rated voltage of the battery pack is greater than 40V and less than or equal to 100V; and / or, the rated current of the battery pack is configured to be 30 to 200A.

[0021] In one embodiment, the battery pack has a discharge rate of 5 to 20C.

[0022] In one embodiment, the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167 W / Kg; and / or, the energy density of the battery pack is greater than or equal to 135 Wh / Kg.

[0023] In one embodiment, the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1334 W / Kg.

[0024] In one embodiment, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 1800W, and the bare weight of the chainsaw is greater than or equal to 1.4Kg and less than or equal to 2.3Kg; and / or, the rated input power of the motor is greater than or equal to 1800W and less than or equal to 3000W, and the bare weight of the chainsaw is less than or equal to 3Kg; and / or, the rated input power of the motor is greater than or equal to 2500W and less than or equal to 3500W, and the bare weight of the chainsaw is less than or equal to 3.4Kg; and / or, the rated input power of the motor is greater than or equal to 3200W and less than or equal to 5500W, and the bare weight of the chainsaw is less than or equal to 3.8Kg.

[0025] In one embodiment, the battery pack is configured with a capacity of 70–450 Wh.

[0026] In one embodiment, the motor is configured as an external rotor motor.

[0027] In one embodiment, the weight of the motor is 450–900g.

[0028] In one embodiment, the cutting assembly is mounted on one end of the housing along the length extension direction of the chainsaw, and the housing is provided with a hanging ring at the end of the chainsaw away from the cutting assembly along the length extension direction of the chainsaw, the hanging ring being configured to attach the chainsaw to an external component.

[0029] Secondly, this application also provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted inside the housing, configured to drive the saw chain to move around the guide plate; and a battery pack mounted on the housing, configured to provide electrical energy to at least the motor; the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 778 W / Kg, wherein the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack; the battery pack includes a plurality of cells, the cells being configured as all-tab cells; and the rated voltage of the battery pack is greater than 40V and less than or equal to 100V.

[0030] In one embodiment, the motor is an external rotor motor.

[0031] Thirdly, this application also provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain surrounding the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing, configured to drive the saw chain to move around the guide plate; a battery pack mounted on the housing, configured to provide electrical power to at least the motor; and a main handle disposed along the length extension direction of the chainsaw, the main handle including a gripping section for a user to hold; the battery pack including a plurality of battery cells, the battery cells being configured as all-tab battery cells; the rated voltage of the battery pack being greater than 40V and less than or equal to 100V; and the motor being configured as an external rotor motor;

[0032] The grip section of the main handle is at least partially located above the motor in the height extension direction of the chainsaw; the rated input power of the motor is greater than or equal to 1200W and less than or equal to 3200W;

[0033] Alternatively, the battery pack includes a front side near the cutting assembly and a rear side away from the cutting assembly along the length extension direction of the chainsaw. One side of the front side of the battery pack is defined as the front side region, and the other side is defined as the rear side region. The cutting assembly and the grip section of the main handle are both located within the front side region, and the rear side of the battery pack is located within the rear side region. The rated input power of the motor is greater than or equal to 600W and less than or equal to 1200W.

[0034] In one embodiment, the rated input power of the motor is greater than or equal to 600W and less than or equal to 1200W, and the bare weight of the chainsaw is greater than or equal to 1Kg and less than or equal to 2Kg; and / or, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 3200W, and the bare weight of the chainsaw is less than or equal to 3Kg.

[0035] Fourthly, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing, configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing, configured to provide electrical energy to the motor; the rated input power of the motor being greater than or equal to 1200W; the ratio of the rated input power of the motor to the bare weight of the chainsaw being greater than or equal to 778W / Kg; wherein, the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack assembled.

[0036] In one embodiment, the chainsaw further includes a main handle, which is disposed above the housing in the height extension direction of the chainsaw.

[0037] In one embodiment, the rated input power of the motor is less than or equal to 4000W.

[0038] In one embodiment, the bare weight of the chainsaw is less than or equal to 3.5 kg.

[0039] In one embodiment, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 1800W, and the bare weight of the chainsaw is less than or equal to 2.3Kg.

[0040] In one embodiment, the rated input power of the motor is greater than or equal to 1400W and less than or equal to 1600W.

[0041] In one embodiment, the rated input power of the motor is greater than or equal to 1800W and less than or equal to 3000W, and the bare weight of the chainsaw is less than or equal to 3.5Kg.

[0042] In one embodiment, the rated input power of the motor is greater than or equal to 2000W and less than or equal to 3000W.

[0043] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W, and the bare weight of the chainsaw is less than or equal to 4Kg.

[0044] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 3600W.

[0045] In one embodiment, the rated input power of the motor is greater than or equal to 2400W and less than or equal to 3000W, and the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 800W / Kg.

[0046] In one embodiment, the rated output power of the battery pack is greater than or equal to 1200W.

[0047] In one embodiment, the rated output power of the battery pack is greater than or equal to 2100W.

[0048] In one embodiment, the battery pack weighs less than 3.5 kg.

[0049] In one embodiment, the battery pack weighs less than 2 kg.

[0050] In one embodiment, the battery pack includes a plurality of cells configured as omni-tab cells.

[0051] In one embodiment, the battery pack has a discharge rate of 5 to 20C.

[0052] In one embodiment, the rated voltage of the battery pack is greater than or equal to 38V and less than or equal to 100V.

[0053] In one embodiment, the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167 W / Kg.

[0054] In one embodiment, the energy density of the battery pack is greater than or equal to 135Wh / Kg.

[0055] In one embodiment, the battery pack is configured with a capacity of 70–450 Wh.

[0056] In one embodiment, the battery pack is configured with a capacity of 180–300 Wh.

[0057] In one embodiment, the rated current of the battery pack is configured to be 30 to 200 A.

[0058] In one embodiment, the rated current of the battery pack is configured to be 30 to 100 A.

[0059] In one embodiment, the weight of the motor is 450–900g.

[0060] In one embodiment, the total weight of the chainsaw is greater than or equal to 1.8 kg and less than or equal to 4.5 kg. The total weight of the chainsaw is the weight of the chainsaw without the guide plate and the saw chain and with the battery pack installed.

[0061] In one embodiment, the chainsaw has a total weight of 1.8 kg or more and 4.2 kg or less.

[0062] In one embodiment, the ratio of the rated input power of the motor to the total weight of the chainsaw is greater than or equal to 467 W / kg.

[0063] In one embodiment, the ratio of the rated input power of the motor to the bare volume of the chainsaw is greater than or equal to 0.162 W / cm². 3 .

[0064] In one embodiment, the cutting assembly is mounted on one end of the housing along the length extension direction of the chainsaw, and the housing is provided with a hanging ring at the end of the chainsaw away from the cutting assembly along the length extension direction of the chainsaw, the hanging ring being configured to attach the chainsaw to an external component.

[0065] In one embodiment, the housing includes a main housing and a battery pack housing, the main housing being configured to house the motor and the battery pack housing being configured to house the battery pack; the main handle is arranged along the length of the housing and positioned above the main housing in the height of the chainsaw.

[0066] Fifthly, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing, configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing, configured to provide electrical energy to the motor; the rated input power of the motor being greater than or equal to 1800W; the bare weight of the chainsaw being less than or equal to 4.8Kg; the ratio of the rated input power of the motor to the bare weight of the chainsaw being greater than or equal to 715W / Kg; wherein, the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack assembled.

[0067] In one embodiment, the chainsaw further includes a main handle, the cutting assembly is disposed at one end of the housing in the length extension direction of the chainsaw, and the main handle is disposed at the other end of the housing away from the cutting assembly in the length extension direction of the chainsaw.

[0068] In one embodiment, the rated input power of the motor is less than or equal to 5500W.

[0069] In one embodiment, the rated input power of the motor is greater than or equal to 2200W and less than or equal to 5500W.

[0070] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W.

[0071] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W, and the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 800W / Kg.

[0072] In one embodiment, the rated input power of the motor is greater than or equal to 3000W and less than or equal to 5500W, and the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 860W / Kg.

[0073] Sixthly, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing and configured to provide electrical power to the motor; and a main handle disposed above the housing in the height extension direction of the chainsaw; the rated input power of the motor is greater than or equal to 1800W; the bare weight of the chainsaw is less than or equal to 3.5Kg; and the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 778W / Kg.

[0074] The bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack.

[0075] In one embodiment, the rated input power of the motor is less than or equal to 4000W.

[0076] In one embodiment, the rated input power of the motor is greater than or equal to 2100W, and the bare weight of the chainsaw is less than 2.7Kg.

[0077] In a seventh aspect, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing and configured to provide electrical power to the motor; and a main handle disposed above the housing in the height extension direction of the chainsaw; the rated input power of the motor is greater than or equal to 2100W; the bare weight of the chainsaw is less than or equal to 3.5Kg; wherein, the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack assembled;

[0078] The chainsaw further includes: an electronic control device configured to control at least the start and stop of the motor; and a temperature detection device disposed on the electronic control device and configured to collect temperature data of the electronic control device;

[0079] The electronic control device is configured to: receive temperature data from the electronic control device; compare the temperature data from the electronic control device with a preset temperature threshold to determine whether the temperature protection conditions are met; and execute a temperature protection action when the temperature protection conditions are met; wherein the preset temperature threshold is less than or equal to 150°C.

[0080] In one embodiment, the bare weight of the chainsaw is less than or equal to 2.7 kg.

[0081] In one embodiment, the preset temperature threshold is greater than or equal to 80°C and less than or equal to 130°C.

[0082] In one embodiment, the temperature protection condition is configured such that the temperature data of the electronic control device is greater than or equal to a preset temperature threshold.

[0083] In one embodiment, the temperature protection action is configured to control the motor to stop.

[0084] In one embodiment, the electronic control device is further configured to: control the motor to restart when the temperature data of the electronic control device is less than a preset recovery threshold, wherein the preset recovery threshold is less than the preset temperature threshold.

[0085] In one embodiment, the chainsaw further includes an axial fan, an air inlet, and an air outlet; the housing forms an internal accommodating space, within which the axial fan, the motor, and the electronic control device are all disposed; the air inlet and the air outlet are disposed on the housing and configured to connect the internal accommodating space to the outside of the housing; the axial fan is mounted on the power output shaft of the motor, the motor drives the axial fan to rotate around a fan axis, and the power output shaft of the motor coincides with the fan axis; the axial fan includes multiple fan blades, the outermost edge of which rotates around the fan axis to form a circular surface; the motor includes a main body with a circular cross-section; the orthographic projection of the main body on the circular surface does not exceed the area defined by the circular surface; the orthographic projection of the electronic control device on the plane containing the circular surface at least partially coincides with the circular surface; the projection of the electronic control device on the fan axis is a first segment, and the projection of the motor on the fan axis is a second segment, the first segment and the second segment at least partially coincide.

[0086] In one embodiment, the chainsaw further includes an axial fan, an air inlet, and an air outlet; the housing forms an internal accommodating space, within which the axial fan, the motor, and the electronic control device are all disposed; the air inlet and the air outlet are disposed on the housing and configured to connect the internal accommodating space to the outside of the housing; the axial fan is mounted on the power output shaft of the motor, the motor drives the axial fan to rotate around the fan axis, and the power output shaft of the motor coincides with the fan axis; the axial fan includes an air inlet side and an air outlet side located on opposite sides of its axial direction; the motor and The electronic control devices are all located on the air outlet side of the axial fan; the motor includes an outer wall extending in the direction of the power output shaft; the electronic control device includes a heat dissipation surface disposed opposite to the outer wall of the motor; a gap is provided between the outer wall of the motor and the heat dissipation surface for airflow to pass through; the axial fan is configured such that airflow enters the housing from the air inlet, flows from the air inlet side of the axial fan to the air outlet side, then enters the gap between the outer wall of the motor and the heat dissipation surface, flows through the outer wall of the motor and the heat dissipation surface to cool the motor and the electronic control device, and finally flows out from the air outlet.

[0087] In one embodiment, the chainsaw further includes an axial fan, an air inlet, and an air outlet; the housing forms an internal accommodating space, within which the axial fan, the motor, and the electronic control device are all disposed; the air inlet and the air outlet are disposed on the housing and configured to connect the internal accommodating space to the outside of the housing; the axial fan is mounted on the power output shaft of the motor, the motor drives the axial fan to rotate around the fan axis, and the power output shaft of the motor coincides with the fan axis; the axial fan is configured to draw airflow from the air inlet into the housing, flow through the motor and the electronic control device, and discharge from the air outlet to the outside of the housing; the electronic control device includes a heat sink, which is disposed at an angle of 5° to 175° relative to a plane parallel to both the fan axis and the length extension direction of the chainsaw.

[0088] In one embodiment, the heat sink is inclined upwards.

[0089] In one embodiment, the electronic control device further includes a control board, which is fixedly disposed relative to the heat sink; the heat sink is configured to conduct and dissipate the heat emitted by the control board into the surrounding air to dissipate heat from the control board; a plurality of heat dissipation ribs are protruding from the heat sink, which are configured to extend at an angle of 5° to 175° relative to a plane parallel to the length extension direction of the fan axis and the chainsaw, so that debris slides off along the heat dissipation ribs.

[0090] In one embodiment, the heat dissipation fins extend in a direction perpendicular to the fan axis.

[0091] In one embodiment, the electronic control device includes a control board and a heat sink fixedly disposed relative to the control board; the heat sink includes the heat dissipation surface; the heat sink is configured to conduct and dissipate the heat emitted by the control board into the surrounding air, thereby dissipating heat from the control board.

[0092] In one embodiment, the control board includes a MOSFET; the orthographic projection of the MOSFET on a preset plane is located within the area defined by the orthographic projection of the motor on the preset plane, and the vertical distance relative to the orthographic projection of the fan axis on the preset plane is less than or equal to 10 mm, wherein the preset plane is perpendicular to a plane perpendicular to the fan axis; and / or, the spacing between the projection of the MOSFET on the fan axis and the projection of the axial fan on the fan axis is configured to be 10 mm to 50 mm.

[0093] In one embodiment, in the extending direction of the fan axis, the axial distance between the end face of the motor near the axial fan and the end face of the axial fan near the motor is 0.5 to 6 mm.

[0094] In one embodiment, the air inlet is located on the side of the housing, and the air outlet is located at the bottom of the housing.

[0095] In one embodiment, the heat dissipation surface is arranged parallel to the fan axis, and the perpendicular distance between the plane parallel to the heat dissipation surface and tangent to the motor and the tangent of the motor to the heat dissipation surface is configured to be 1mm to 40mm.

[0096] In one embodiment, the battery pack includes a plurality of cells, the cells being multi-tab cells.

[0097] In one embodiment, the rated voltage of the battery pack is greater than or equal to 36V and less than or equal to 100V; preferably, the rated voltage of the battery pack is greater than or equal to 38V and less than or equal to 100V.

[0098] Eighthly, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing and configured to provide electrical power to the motor; and a main handle disposed above the housing in the height extension direction of the chainsaw; the rated input power of the battery pack is greater than or equal to 1800W; the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167W / Kg; the weight of the battery pack is less than or equal to 3.5Kg; and the energy density of the battery pack is greater than or equal to 135Wh / Kg.

[0099] In one embodiment, the battery pack weighs less than 1.8 kg.

[0100] In one embodiment, the ratio of the rated input power of the motor to the total weight of the chainsaw is greater than or equal to 467 W / Kg, and the total weight of the chainsaw is the weight of the chainsaw without the guide plate and the saw chain and with the battery pack installed.

[0101] In one embodiment, the battery pack includes a plurality of cells configured as omni-tab cells.

[0102] Ninthly, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing, configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing, configured to provide electrical power to the motor; and a main handle disposed above the housing in the height extension direction of the chainsaw; the ratio of the rated output power of the motor to the bare weight of the chainsaw is greater than or equal to 778 W / Kg; wherein, the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack; the rated output power of the motor is greater than or equal to 1800 W; the battery pack includes a plurality of cells, the cells being configured as all-tab cells; the rated voltage of the battery pack is greater than or equal to 36V and less than or equal to 100V.

[0103] In one embodiment, the rated output power of the motor is less than or equal to 4000W;

[0104] In one embodiment, the rated output power of the motor is greater than or equal to 2100W and less than or equal to 4000W.

[0105] In one embodiment, the battery pack weighs less than 1.8 kg.

[0106] In one embodiment, the rated current of the battery pack is 30 to 200 A; preferably, the rated current of the battery pack is 30 to 100 A.

[0107] In one embodiment, the rated voltage of the battery pack is greater than or equal to 38V and less than or equal to 100V.

[0108] In a tenth aspect, this application provides a chainsaw, comprising: a housing; a cutting assembly mounted on the housing, including a guide plate and a saw chain disposed around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted within the housing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing and configured to provide electrical power to the motor; and a main handle disposed above the housing in the height extension direction of the chainsaw; the rated output power of the motor being greater than or equal to 1600W; the bare weight of the chainsaw being less than or equal to 3.5Kg; the ratio of the rated output power of the motor to the bare weight of the chainsaw being greater than or equal to 600W / Kg; wherein, the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack assembled.

[0109] In one embodiment, the rated output power of the motor is less than or equal to 3000W.

[0110] In one embodiment, the ratio of the rated output power of the motor to the bare weight of the chainsaw is greater than 700W / Kg and less than or equal to 1200W / Kg.

[0111] In one embodiment, the ratio of the rated output power of the motor to the total weight of the chainsaw is greater than or equal to 385 W / kg. Attached Figure Description

[0112] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0113] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0114] Figure 1 This is a perspective view of the overall structure of a chainsaw according to an embodiment of this application;

[0115] Figure 2 This is a left view of a chainsaw according to an embodiment of this application, in the state where the left housing is not assembled;

[0116] Figure 3 This is a rear view of the overall structure of a chainsaw according to an embodiment of this application;

[0117] Figure 4 This is a working scene diagram of a chainsaw used for tree work according to an embodiment of this application;

[0118] Figure 5 This is a perspective view of a chainsaw according to an embodiment of this application in a state without the battery pack and cutting components installed;

[0119] Figure 6 This is a partial three-dimensional structural view of a chainsaw according to an embodiment of this application;

[0120] Figure 7 This is a left view of a partial structure of a chainsaw according to an embodiment of this application, showing the positional relationship between the axial fan and the electronic control device;

[0121] Figure 8 This is a left view of a partial structure of a chainsaw according to an embodiment of this application, showing the positional relationship between the motor and the electronic control device;

[0122] Figure 9This is a partial front view of a chainsaw according to an embodiment of this application, showing the positional relationship between the motor, axial fan and electronic control device;

[0123] Figure 10 This is a left view of an axial fan and motor according to an embodiment of this application;

[0124] Figure 11 This is a left view of a motor, axial fan, and electronic control device according to an embodiment of this application;

[0125] Figure 12 This is a left view of a motor and electronic control device according to an embodiment of this application;

[0126] Figure 13 This is a cross-sectional view of an embodiment of this application;

[0127] Figure 14 This is a flowchart of a temperature protection strategy according to an embodiment of this application;

[0128] Figure 15 This is a flowchart of a temperature protection strategy according to a specific embodiment of this application;

[0129] Figure 16 This is a perspective view of the overall structure of a chainsaw according to another embodiment of this application;

[0130] Figure 17 This is a schematic diagram of the structure of a chainsaw according to another embodiment of this application;

[0131] Figures 18a-18d This is a schematic diagram showing the positional relationship between the electronic control device and the axial fan projected onto the first plane P1 in several embodiments of this application.

[0132] Figure label:

[0133] Chainsaw 100, housing 10, internal accommodating space 101, flow guide 102, flow guide cavity 1021, main housing 103, main housing projection leading edge 1031, battery pack accommodating part 104, reinforcing rib 105, left housing 1001, right housing 1002, bottom surface 1003, cutting assembly 20, guide plate 201, saw chain 202, safety guard 203, motor 30, motor projection leading edge 3001, motor projection trailing edge 3002, power output shaft 301, main body 302, motor outer wall 303, front end 3031, rear end 3032, airflow outlet 304, battery pack 40, front side 401, rear side 402, main handle 501, auxiliary handle 502, electronic control device 60, control board 601, MOSFET 6011, heat sink 602, heat dissipation surface 6021, heat dissipation fins 6022, temperature detection device 70, temperature sensor 701, axial fan 801, fan blade 8011, circular surface 8012, fan axis F, air inlet 802, air outlet 803, chip removal port 804, hanging ring 90, first hanging ring 901, second hanging ring 902. Detailed Implementation

[0134] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0135] A chainsaw is a handheld garden tool used for cutting wood. Different applications and cutting targets place varying demands on the chainsaw's cutting performance, weight, and size. In related technologies, cutting large or hard wood typically requires a high-power motor. However, meeting this high power output often results in increased weight and size of the battery pack and motor, increasing the overall weight and hindering weight reduction. This reduces operator comfort, increases fatigue, and causes significant inconvenience. To alleviate user burden, chainsaws are typically lightweight to improve comfort and reduce fatigue. However, this often leads to reduced size or weight, which in turn results in lower power output, failing to meet cutting performance requirements. This can cause slow cutting speeds, low efficiency, or even inability to cut, impacting operator productivity. In other words, chainsaws in this technology either have high power and good cutting performance but are heavy, or are lightweight but have low power and poor cutting performance. For those skilled in the art, the pressing technical challenge is how to simultaneously balance the requirements of cutting performance and lightweight design.

[0136] To address the aforementioned issues, this application provides a chainsaw that improves motor output power while also meeting the requirement for overall machine lightweighting.

[0137] Reference Figures 1 to 4 A chainsaw 100 includes a housing 10, a cutting assembly 20, a motor 30, and a battery pack housing 104. The cutting assembly 20 is mounted in the housing 10 and includes a guide plate 201 and a saw chain 202 surrounding the guide plate 201. The guide plate 201 provides support and guides the saw chain 202. The motor 30 is mounted in the housing 10 and configured to drive the saw chain 202 to move around the guide plate 201. The battery pack housing 104 is configured to house a battery pack 40, which is configured to provide electrical power to at least the motor 30. The rated input power of the motor 30 is greater than or equal to 1200W and less than or equal to 5500W. The ratio of the rated input power of the motor 30 to the bare weight of the chainsaw 100 is greater than or equal to 778W / kg, where the bare weight of the chainsaw 100 is the weight of the chainsaw 100 without the guide plate 201, saw chain 202, and battery pack 40.

[0138] It should be noted that the bare weight of the chainsaw 100 refers to the weight of the chainsaw 100 without the guide plate 201, saw chain 202, and battery pack 40 installed. In some embodiments, the chainsaw 100 includes a safety guard covering the cutting assembly 20; and / or, the chainsaw 100 includes a lubrication mechanism, which includes an oil reservoir for containing lubricating fluid. Further, the bare weight of the chainsaw 100 refers to the weight of the chainsaw 100 without the guide plate 201, saw chain 202, battery pack 40, and safety guard installed, and without lubricating fluid in the oil reservoir of the lubrication mechanism.

[0139] The chainsaw motor boasts high output power and lightweight design, simultaneously meeting the demands for cutting performance and lightweight construction. It's understood that the higher the rated input power of motor 30, the higher its upper limit of output power. A larger ratio of motor 30's rated input power to the bare weight of chainsaw 100 further enhances the chainsaw's ability to balance high output power and lightweight construction. On one hand, motor 30's high power meets cutting performance requirements; on the other hand, chainsaw 100's light weight reduces user fatigue. Furthermore, for users, high power also improves cutting efficiency, shortens working time, and ultimately creates greater economic benefits for the landscaping team.

[0140] Furthermore, the rated input power of the motor 30 can be 1200W, 1300W, 1400W, 1500W, 1600W, 1800W, 2000W, 2400W, 3000W, 3500W, 4000W, 4500W, 5000W, 5500W, etc. Optionally, the rated input power of the motor 30 is greater than or equal to 1800W and less than or equal to 5500W. Also optionally, the rated input power of the motor 30 is greater than or equal to 2100W and less than or equal to 5500W.

[0141] Furthermore, the ratio of the rated input power of the motor 30 to the bare weight of the chainsaw 100 can be 778W / Kg, 800W / Kg, 850W / Kg, 900W / Kg, 940W / Kg, 1000W / Kg, 1070W / Kg, etc. Optionally, the ratio of the rated input power of the motor 30 to the bare weight of the chainsaw 100 is greater than 800W / Kg.

[0142] Further, the bare weight of the chainsaw 100 is less than or equal to 4 kg. Exemplarily, the bare weight of the chainsaw 100 can be 1.5 kg, 1.8 kg, 2 kg, 2.2 kg, 2.35 kg, 2.55 kg, 2.7 kg, 2.8 kg, 3 kg, 3.5 kg, 4 kg, etc. Optionally, the bare weight of the chainsaw 100 is less than or equal to 3.5 kg. Also optionally, the bare weight of the chainsaw 100 is less than 3 kg. Further optionally, the bare weight of the chainsaw 100 is less than 2.7 kg.

[0143] It is understandable that the chainsaw 100 is lighter at the same power level, meaning that the chainsaw 100 is lighter while achieving the same cutting performance, thus better meeting the needs of high power and lightweight design.

[0144] In some embodiments, the rated input power of the motor 30 is greater than or equal to 1800W and less than or equal to 5500W. The bare weight of the chainsaw 100 is less than or equal to 3.5Kg.

[0145] In some embodiments, the rated input power of the motor 30 is greater than or equal to 2100W and less than or equal to 5500W. The bare weight of the chainsaw 100 is less than 3Kg.

[0146] In some embodiments, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 4000W. The bare weight of the chainsaw is less than or equal to 3.5Kg.

[0147] In some embodiments, the rated input power of the motor 30 is greater than or equal to 1200W and less than or equal to 1800W, and the bare weight of the chainsaw 100 is greater than or equal to 1.4Kg and less than or equal to 2.3Kg. Exemplarily, the rated input power of the motor 30 can be 1200W, 1400W, 1500W, 1600W, 1700W, 1800W, etc. The bare weight of the chainsaw 100 can be 1.4Kg, 1.5Kg, 1.6Kg, 1.7Kg, 1.8Kg, 2Kg, 2.1Kg, 2.3Kg, etc.

[0148] In some embodiments, the rated input power of the motor 30 is greater than or equal to 1800W and less than or equal to 3000W, and the bare weight of the chainsaw 100 is less than or equal to 3Kg. Exemplarily, the rated input power of the motor 30 can be 1800W, 2000W, 2100W, 2400W, 2800W, 3000W, etc. The bare weight of the chainsaw 100 can be 1.5Kg, 1.8Kg, 2Kg, 2.2Kg, 2.55Kg, 2.8Kg, 3Kg, etc.

[0149] In some embodiments, the rated input power of the motor 30 is greater than or equal to 2500W and less than or equal to 3500W, and the bare weight of the chainsaw 100 is less than or equal to 3.4Kg. Exemplarily, the rated input power of the motor 30 can be 2500W, 2600W, 2800W, 3000W, 3100W, 3200W, 3500W, etc. The bare weight of the chainsaw 100 can be 1.8Kg, 2Kg, 2.2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.4Kg, etc.

[0150] In some embodiments, the rated input power of the motor 30 is greater than or equal to 3200W and less than or equal to 5500W, and the bare weight of the chainsaw 100 is less than or equal to 3.8Kg. Exemplarily, the rated input power of the motor 30 can be 3200W, 3400W, 3500W, 3800W, 4000W, 4500W, 5000W, 5500W, etc. The bare weight of the chainsaw 100 can be 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.8Kg, etc.

[0151] In some embodiments, the rated input power of the motor is greater than or equal to 1800W and less than or equal to 3000W. Exemplarily, the rated input power of the motor can be 1800W, 2000W, 2100W, 2400W, 2800W, 3000W, etc. The bare weight of the chainsaw is less than or equal to 3.5Kg. Exemplarily, the bare weight of the chainsaw can be 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.5Kg, etc. Preferably, the rated input power of the motor is greater than or equal to 2000W and less than or equal to 3000W. Exemplarily, the rated input power of the motor can be 2000W, 2100W, 2400W, 2600W, 2800W, 3000W, etc.

[0152] In some embodiments, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W. Exemplarily, the rated input power of the motor can be 2800W, 3000W, 3200W, 3500W, 3600W, 4000W, etc. Preferably, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 3600W. The bare weight of the chainsaw is less than or equal to 4Kg. Exemplarily, the bare weight of the chainsaw can be 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 4Kg, etc. Preferably, the bare weight of the chainsaw is less than or equal to 3.5Kg. Exemplarily, the bare weight of the chainsaw can be 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.5Kg, etc.

[0153] In some embodiments, the rated input power of the motor is greater than or equal to 2400W and less than or equal to 3000W. Exemplarily, the rated input power of the motor can be 2400W, 2600W, 2800W, 3000W, etc. The ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 800W / Kg.

[0154] As an example, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 4000W; the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 778W / Kg. The bare weight of the chainsaw is less than or equal to 3.5Kg. Preferably, the rated input power of the motor is greater than or equal to 2000W and less than or equal to 3000W, and the bare weight of the chainsaw is less than or equal to 3Kg. As a specific example, the rated input power of the motor is 2400W, and the bare weight of the chainsaw is 2.55Kg; as another specific example, the rated input power of the motor is 1500W, and the bare weight of the chainsaw is 1.8Kg; as yet another specific example, the rated input power of the motor is 3000W, and the bare weight of the chainsaw is 2.87Kg.

[0155] For ease of understanding, please refer to Figure 2 and Figure 3 As shown, the chainsaw extends along three orthogonal spatial directions: the length extension direction L (also known as the X-axis direction), the width extension direction W (also known as the Y-axis direction), and the height extension direction H (also known as the Z-axis direction). The length extension direction L is the same as the length extension direction of the guide plate 201; the width extension direction W is the same as the thickness extension direction of the guide plate 201; and the height extension direction H is the same as the height extension direction of the guide plate 201. The side of the chainsaw 100 with the cutting component 20 along its length extension direction is defined as front, and the side away from the cutting component 200 is defined as rear. When the user uses the chainsaw and faces forward, the left-hand side of the chainsaw 100 along its width extension direction is defined as left, and the right-hand side is defined as right; the top of the chainsaw 100 along its height extension direction is defined as top, and the bottom as bottom. It should be understood that the above definitions are for illustrative purposes only and should not be construed as limiting this application.

[0156] In some scenarios, operators may need to climb trees to perform their work. Compared to regular chainsaws, chainsaws for tree work are typically used by arborists to cut branches. Because they need to be carried to the tree and the space for extension on the tree is limited, they often need to be lightweight and compact.

[0157] In some embodiments, the housing 10 includes a main housing 103 that at least accommodates a motor 30. The chainsaw 100 also includes a main handle 501 for a user to grip when operating the chainsaw 100. The main handle 501 is disposed along the length extension direction L of the chainsaw 100. The main handle 501 is disposed above the main housing 103 in the height extension direction H of the chainsaw 100. The orthographic projection of the main housing 103 onto the reference plane P includes the leading edge 1031 of the main housing projection near the cutting assembly 20 in the length extension direction L of the chainsaw 100; the orthographic projection of the motor 30 onto the reference plane P includes the leading edge 3001 of the motor projection near the cutting assembly 20 and the trailing edge 3002 of the motor projection away from the cutting assembly 20 in the length extension direction L of the chainsaw 100; in the length extension direction L of the chainsaw 100, the orthographic projection of the main handle 501 onto the reference plane P is at least partially located between the leading edge 1031 of the main housing projection and the trailing edge 3002 of the motor projection; wherein, the reference plane P is a plane perpendicular to the height extension direction H of the chainsaw 100. That is, the main handle 501 at least partially falls on Figure 2 Within area E.

[0158] The main handle 501 is positioned above the housing 10 along the height extension direction of the chainsaw 100. Compared to a structure where the main handle is located at the rear of the housing, positioning the main handle 501 above the housing 10 makes the chainsaw 100 more compact and portable.

[0159] Furthermore, the ratio of the rated input power of the motor 30 to the bare weight of the chainsaw 100 is greater than 800 W / Kg.

[0160] In some embodiments, the ratio of the rated input power of the motor 30 to the bare volume of the chainsaw 100 is greater than or equal to 0.162 W / cm². 3 For example, the ratio of the rated input power of the motor to the bare volume of the chainsaw can be 0.162 W / cm². 3 0.165W / cm 3 0.170W / cm 3 0.175W / cm 3 0.178W / cm 3 0.185W / cm 3 Etc. Preferably, the ratio of the rated input power of the motor to the bare volume of the chainsaw is greater than or equal to 0.170 W / cm². 3 As a specific example, the motor has a rated input power of 2400W, and the chainsaw's length, width, and height are 31.6cm, 20.4cm, and 21.0cm respectively, with a volume of 13537.44cm². 3 The ratio of the rated input power of the motor to the bare volume of the chainsaw is 0.1773 W / cm². 3 It should be noted that the length, width, and height dimensions of the chainsaw are the maximum dimensions of the chainsaw in the length extension direction L, width extension direction W, and height extension direction H, respectively. These dimensions can be measured by clamping the chainsaw between two parallel planes.

[0161] It's understandable that the higher the ratio of the motor's rated input power to the chainsaw's bare volume, the larger the volume will be for the same input power, and the higher the input power will be for the same volume. And the higher the input power, the higher the output power. Therefore, it's possible to achieve a chainsaw with high power and a small size, balancing cutting performance and portability.

[0162] In some embodiments, the rated output power of the motor 30 is greater than or equal to 1600W. The rated output power of the motor 30 is the maximum output power that the motor 30 can operate stably for a long period under normal operating conditions. It should be noted that "the motor can operate stably for a long period" should be understood as meaning that the motor 30 can operate continuously for at least the time it takes for the battery pack 40 to be completely depleted from a full charge. For example, the rated output power of the motor 30 can be 1600W, 1800W, 2000W, 2400W, 2800W, 3000W, etc. Further, the rated output power of the motor 30 is greater than or equal to 1600W and less than or equal to 5000W. For example, the rated output power of the motor 30 can be 1600W, 1800W, 2000W, 2400W, 2800W, 3000W, 3500W, 4000W, 4500W, 5000W, etc. Optionally, the rated output power of motor 30 is greater than or equal to 1600W and less than or equal to 3000W.

[0163] In some embodiments, the ratio of the rated output power of the motor 30 to the bare weight of the chainsaw 100 is greater than or equal to 600 W / kg. Exemplarily, the ratio of the rated output power of the motor 30 to the bare weight of the chainsaw 100 can be 600 W / kg, 625 W / kg, 700 W / kg, 800 W / kg, 900 W / kg, 1000 W / kg, 1100 W / kg, 1200 W / kg, etc. Optionally, the ratio of the rated output power of the motor 30 to the bare weight of the chainsaw 100 is greater than or equal to 625 W / kg and less than or equal to 1200 W / kg. More preferably, the ratio of the rated output power of the motor 30 to the bare weight of the chainsaw 100 is greater than 700 W / kg and less than or equal to 1200 W / kg. Among them, the ratio of the rated output power of motor 30 to the bare weight of chainsaw 100 is 625W / Kg compared to 700W / Kg. The embodiment with a ratio of 700W / Kg better balances the requirements of high power and lightweight, and has better overall performance.

[0164] As a specific example, the rated output power of the motor is 2000W; the bare weight of the chainsaw is 2.55Kg; the ratio of the rated output power of the motor to the bare weight of the chainsaw is 784.3W / Kg.

[0165] It's understandable that a higher ratio of the rated output power of motor 30 to the bare weight of chainsaw 100 results in a lighter weight for the same power output and a higher power output for the same weight, better balancing the needs for high power and lightweight design. On one hand, the high power of motor 30 meets the cutting performance requirements; on the other hand, the lightweight chainsaw 100 reduces user fatigue. Furthermore, for users, high power can improve cutting efficiency, shorten working time, and thus create greater economic benefits for the landscaping team.

[0166] In some embodiments, the ratio of the rated output power of the motor 30 to the bare volume of the chainsaw 100 is greater than or equal to 0.125 W / cm². 3 For example, the ratio of the motor's rated output power to the bare volume of the chainsaw can be 0.125 W / cm². 3 0.135W / cm 3 0.145W / cm 3 0.16W / cm 3 Etc. Optionally, in some embodiments, the ratio of the motor's rated output power to the bare volume of the chainsaw is greater than or equal to 0.13 W / cm². 3 Less than or equal to 0.2 W / cm 3 For example, the ratio of the motor's rated output power to the bare volume of the chainsaw can be 0.13 W / cm². 3 0.15W / cm 3 0.18W / cm 3 0.2W / cm 3 wait.

[0167] It's understandable that the higher the ratio of the motor's rated output power to the chainsaw's bare volume, the larger the volume will be for the same output power, and the higher the output power will be for the same volume. Therefore, it's possible to achieve a chainsaw with high power and a small size, balancing cutting performance and portability.

[0168] In some embodiments, the total weight of the chainsaw 100 is greater than or equal to 1.8 kg and less than or equal to 4.5 kg. The total weight of the chainsaw 100 is the weight of the chainsaw 100 without the guide plate 201 and saw chain 202 and with the battery pack 40 installed. That is, the total weight of the chainsaw 100 is the sum of the weight of the bare chainsaw and the weight of the battery pack. Exemplarily, the total weight of the chainsaw 100 can be 1.8 kg, 2 kg, 2.5 kg, 3 kg, 3.5 kg, 3.8 kg, 4 kg, 4.15 kg, 4.2 kg, 4.4 kg, 4.5 kg, etc. Optionally, the total weight of the chainsaw 100 is greater than or equal to 3.5 kg and less than or equal to 4.5 kg. Preferably, the total weight of the chainsaw 100 is less than or equal to 4.2 kg. In one specific embodiment, the total weight of the chainsaw 100 is 4.15 kg.

[0169] In some embodiments, the ratio of the rated output power of the motor 30 to the total weight of the chainsaw 100 is greater than or equal to 385 W / Kg. Exemplarily, the ratio of the rated output power of the motor to the total weight of the chainsaw can be 385 W / Kg, 425 W / Kg, 475 W / Kg, 500 W / Kg, 550 W / Kg, etc.

[0170] It is understandable that a high ratio of the rated output power of the motor to the total weight of the chainsaw means that, for the same power, it is lighter and for the same weight, it has greater power. This also indicates that the chainsaw can better balance high output power and lightweight design.

[0171] In some embodiments, the ratio of the rated input power of the motor 30 to the total weight of the chainsaw 100 is greater than or equal to 467 W / kg. Exemplarily, the ratio of the rated input power of the motor 30 to the total weight of the chainsaw 100 can be 467 W / kg, 480 W / kg, 500 W / kg, 550 W / kg, 578 W / kg, 600 W / kg, 700 W / kg, etc. Preferably, the ratio of the rated input power of the motor to the total weight of the chainsaw is greater than or equal to 500 W / kg. As a specific example, the rated input power of the motor is 2400 W, and the total weight of the chainsaw is 4.15 kg. The ratio of the rated input power of the motor 30 to the total weight of the chainsaw 100 is 578 W / kg.

[0172] To achieve both high output power and lightweight design, one possible solution is to increase the output power of the motor, while another is to reduce the overall weight of the machine.

[0173] In some embodiments, the rated output power of the battery pack is greater than or equal to 1200W. Exemplarily, the rated output power of the battery pack 40 can be 1200W, 1600W, 2000W, 2100W, 2400W, 2800W, 3000W, 3200W, 3600W, 4000W, 4500W, 5000W, 5500W, etc. Preferably, the rated output power of the battery pack 40 is greater than 2100W.

[0174] In some embodiments, the battery pack 40 weighs less than 3.5 kg. Exemplarily, the battery pack 40 may weigh 1.3 kg, 1.5 kg, 1.6 kg, 1.7 kg, 1.8 kg, 1.9 kg, 2 kg, 2.5 kg, 3 kg, 3.5 kg, etc. Optionally, the battery pack 40 weighs less than 3 kg. Further optionally, the battery pack 40 weighs less than 2 kg. More preferably, the battery pack 40 weighs less than 1.8 kg.

[0175] It is understandable that the battery pack is an integral part of the entire machine. A lightweight battery pack contributes to a lighter overall machine weight compared to the same bare machine. Furthermore, to achieve high motor output power, the battery pack also needs to provide high output power; that is, the battery pack's output power must also be high. This embodiment achieves high power and a lightweight overall machine through the high power and light weight of the battery pack.

[0176] In some embodiments, the battery pack 40 includes multiple battery cells configured as tabless cells. Tabless cells are also called multi-tab cells. For the structure of tabless cells, any existing tabless cell can be used, configured according to actual needs, and is not limited here. As a specific example, the tabless cells are configured as 21700 tabless cells, where "21" in "21700" indicates a battery diameter of 21mm, "70" indicates a height of 70mm, and "0" represents a cylindrical battery.

[0177] In a multi-tab battery cell, the positive electrode is directly formed on the entire cell body using metal extension technology, connecting the metal body of the positive electrode directly to the cell casing. The negative electrode is extended using the same technology and connected to the lower end of the cell casing. With a multi-tab cell, the entire current collector becomes a tab, allowing current to flow through countless paths along the entire length of the anode and cathode, rather than being limited to one or a few tabs. This significantly shortens the current path within the battery, substantially reduces internal resistance, and improves current conduction efficiency.

[0178] Omni-tab cells have the advantages of low internal resistance, less heat generation, and a large maximum current carrying capacity, which allows for a larger maximum discharge current. At the same discharge current, fewer cells are needed, reducing the overall cell weight and consequently the battery pack weight. With the same number of cells, a larger discharge current can be achieved, resulting in greater output power at the same voltage. This allows for both high power output and lightweight design.

[0179] Furthermore, the internal resistance of the battery pack is configured to ensure that the maximum depth of discharge is greater than or equal to 85%. Preferably, the maximum depth of discharge is greater than or equal to 90%. It is understood that even as the voltage decreases and the current increases, the heat generated is still lower than that of a conventional battery pack due to the low internal resistance, preventing equipment damage from overheating. Therefore, the undervoltage protection value can be set lower than that of a conventional battery pack, achieving a greater depth of discharge and longer single-pack battery life. Because of the use of all-tab cells, the internal resistance of the battery pack is an order of magnitude lower than that of a conventional battery pack, only about one-tenth of the internal resistance of a conventional battery pack. As an example, the maximum depth of discharge of the battery pack is approximately 95%.

[0180] In some embodiments, the rated voltage of the battery pack is greater than or equal to 36V and less than or equal to 100V. Exemplarily, the rated voltage of the battery pack can be 36V, 38V, 40V, 48V, 54V, 60V, 80V, 100V, etc. Optionally, the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. Preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 100V. More preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 80V. In one specific embodiment, the rated voltage of the battery pack is 54V.

[0181] It is understandable that power equals the product of voltage and current, while heat generation increases exponentially with increasing current; the higher the current, the more heat is generated. Therefore, on the one hand, under the same current, the higher the voltage, the higher the power. That is, given the same maximum current allowed by the battery pack, this embodiment achieves higher output power through a higher voltage. On the other hand, under the same output power, the higher the voltage, the lower the current, and the less heat is generated. That is, under the same output power, this embodiment reduces heat generation through a higher voltage, thus making it less likely to trigger temperature protection, ensuring the motor can operate continuously and stably under high power, reducing losses, and extending battery pack life. This achieves both high power and light weight in the battery pack and high power and light weight in the overall machine, balancing the needs of high power and lightweight design.

[0182] In some embodiments, the rated current of the battery pack 40 is configured to be 30-200A. Exemplarily, the rated current of the battery pack can be 30A, 40A, 50A, 60A, 70A, 80A, 100A, 120A, 140A, 150A, 180A, 200A, etc. Preferably, the rated current of the battery pack is 30-100A. In one specific embodiment, the rated current of the battery pack is 60A.

[0183] In some embodiments, the discharge rate of the battery pack 40 is 5 to 20C. Exemplarily, the discharge rate of the battery pack can be 5C, 7.5C, 10C, 15C, 20C, etc. Optionally, in some embodiments, the discharge rate of the battery pack is 7.5 to 12C. Exemplarily, the discharge rate of the battery pack can be 7.5C, 10C, 12C, etc. As a specific example, the discharge rate of the battery pack is 10C. Here, C is a multiple of the battery capacity; for example, a 1Ah battery that discharges 1Ah of energy in 1 hour has a discharge rate of 1C.

[0184] Generally, the higher the discharge rate of a battery pack, the stronger its discharge capacity, allowing it to release more energy in a shorter time, resulting in faster discharge speeds and higher chainsaw cutting efficiency. Furthermore, all-tab cells have low internal resistance, generate less heat, and have a higher maximum current carrying capacity (the maximum current a cell can withstand under specific conditions). This allows for a larger maximum allowable discharge current, requiring fewer cells for the same discharge current, thus reducing the overall cell weight and consequently the battery pack weight. With the same number of cells, a larger discharge current can be achieved, resulting in greater output power at the same voltage. This allows for both high power output and lightweight design.

[0185] In some embodiments, the ratio of the rated output power of the battery pack 40 to the weight of the battery pack 40 (also referred to as the power density of the battery pack) is greater than or equal to 1167 W / Kg. Exemplarily, the power density of the battery pack 40 may be 1167 W / Kg, 1200 W / Kg, 1300 W / Kg, 1334 W / Kg, 1400 W / Kg, 1500 W / Kg, 1600 W / Kg, etc. Optionally, the ratio of the rated output power of the battery pack 40 to the weight of the battery pack 40 is greater than or equal to 1334 W / Kg.

[0186] In some embodiments, the energy density of the battery pack 40 is greater than or equal to 135 Wh / kg. Exemplarily, the energy density of the battery pack can be 135 Wh / kg, 140 Wh / kg, 150 Wh / kg, 160 Wh / kg, etc. Here, the energy density of the battery pack is the electrical energy that the battery pack can store per unit mass. It is understood that the higher the energy density of the battery pack, the lighter its weight will be for the same capacity.

[0187] In some embodiments, the capacity of the battery pack 40 is configured to be 70–450 Wh. Exemplarily, the capacity of the battery pack can be 70 Wh, 120 Wh, 150 Wh, 180 Wh, 200 Wh, 240 Wh, 270 Wh, 300 Wh, 380 Wh, 450 Wh, etc. Optionally, the capacity of the battery pack 40 is configured to be greater than or equal to 180 Wh and less than or equal to 300 Wh.

[0188] In one specific embodiment, the battery pack has a capacity of 240Wh. The energy density of the battery pack is 150Wh / kg.

[0189] In some embodiments, the motor 30 is configured as an external rotor motor. In some embodiments, the weight of the motor 30 is 450–900g. Exemplarily, the weight of the motor can be 450g, 550g, 600g, 675g, 700g, 800g, 900g, etc. Optionally, the weight of the motor 30 is 550–750g. In a specific example, the weight of the motor is 675g.

[0190] It's understandable that external rotor motors, compared to internal rotor motors, offer advantages such as higher efficiency, less rapid speed drop as torque increases, smaller size, and lighter weight for the same motor output power. Therefore, they are more suitable for chainsaws to output high power, maintain high speeds under high torque, provide better cutting performance, and simultaneously meet the requirements for lightweight design.

[0191] In some embodiments, the battery pack is configured such that the maximum power that the motor can continuously output over a period of 8 to 20 seconds is greater than or equal to 2400W and less than or equal to 6000W. For example, the maximum power that the motor can continuously output over a period of 8 to 20 seconds could be 2400W, 3000W, 3600W, 4800W, 6000W, etc.

[0192] It is understandable that the short-term output power of a motor can be higher than the long-term output power. Chainsaws are tools for intermittent operation, with each operation lasting a short time, generally within 20 seconds. The short-term time range is greater than the single cutting time, and the maximum power that the motor can output can also measure the maximum cutting capacity of the chainsaw.

[0193] In some embodiments, refer to Figure 1 The housing 10 includes a main housing 103 and a battery pack housing 104. The main housing 103 is configured to house the motor 30, and the battery pack housing 104 is configured to house the battery pack 40. The main handle 501 is arranged along the length extension direction L (X-axis direction) of the housing 10 and is positioned above the main housing 103 in the height extension direction H (Y-axis direction) of the chainsaw. Optionally, the battery pack 40 is detachably installed within the battery pack housing 104.

[0194] In some embodiments, refer to Figure 3 The cutting component 20 is installed at one end of the housing 10 along the length extension direction L of the chainsaw. The housing 10 is provided with a hanging ring 90 at the end away from the cutting component 20 along the length extension direction L of the chainsaw 100. The hanging ring 90 is configured to attach the chainsaw 100 to an external component.

[0195] The external components are configured as safety ropes and / or self-locking hooks. As an example, the guide plate 201 and saw chain 202 are mounted on the front of the main housing 103 and extend at least partially beyond the main housing 103, and the hanging ring 90 is located at the rear of the battery pack receiving portion 104.

[0196] Reference Figure 4In tree-climbing operations using chainsaws, users often need to carry the chainsaw with them while climbing or moving, allowing for immediate use once at the target location. To ensure safety, the chainsaw is typically connected to a safety rope to prevent falls. By installing a hanging loop, two methods can be used: firstly, the safety rope can be attached, with the other end connected to a safety harness worn by the user or a fixed suspension point, preventing falls and allowing the chainsaw to be transported to the target location; secondly, a self-locking hook can be attached to the hanging loop, usually attached to the operator's safety harness or belt, allowing the user to carry the chainsaw freely while climbing or moving, thus improving safety.

[0197] In one specific embodiment, the housing 10 is provided with a first hanging ring 901 and a second hanging ring 902. One of the first hanging ring 901 and the second hanging ring 902 is used to connect a safety rope, and the other is used to connect a self-locking hook. By providing two hanging rings 901 for connecting the safety rope and the self-locking hook respectively, it is more convenient and safer for users to use the chainsaw for tree work.

[0198] The chainsaw of this embodiment can output greater power while being lightweight. Compared with existing chainsaws, it is lighter, more flexible, and easier to use while maintaining the same cutting performance.

[0199] In some embodiments, refer to Figure 1 The chainsaw also includes an auxiliary handle 502, which is located on the left side of the housing 10, i.e., the side of the chainsaw 100 closest to the user during use. In use, the user typically holds the main handle 501 with their right hand and the auxiliary handle 502 with their left hand. The auxiliary handle 502 works in conjunction with the main handle 501 to facilitate user operation of the chainsaw.

[0200] Specifically, the housing 10 includes a left housing 1001 and a right housing 1002. The main handle 501 and the battery pack receiving part 104 are integrally formed with the housing 10. The main handle 501 is formed on the upper part of the left housing 1001 and the right housing 1002, and the battery pack receiving part 104 is formed on the rear part of the left housing 1001 and the right housing 1002.

[0201] During the discharge process, the voltage of the battery pack gradually decreases from full charge to empty charge, and the maximum output power of the battery pack gradually decreases. This may result in the chainsaw being very powerful when fully charged, but gradually weakening as the power decreases, leading to a significant difference in user experience.

[0202] To address this technical problem, the chainsaw provided in this application also includes a control board configured to control the output power of the battery pack to not exceed a power limiting threshold, wherein the power limiting threshold is less than the rated output power of the battery pack. Optionally, the power limiting threshold is configured to be 50% to 80% of the rated output power of the battery pack. As a specific example, the rated output power of the battery pack is 3600W, and the power limiting threshold is 2400W.

[0203] This embodiment sets a power limit threshold and controls the output power of the battery pack to not exceed the power limit threshold. During use, even when the battery is low, the output power of the chainsaw can reach the power limit threshold or be only slightly different. This ensures that the output power of the chainsaw does not vary much as the battery pack discharges, and the chainsaw outputs stably throughout the entire use process, resulting in a better user experience.

[0204] Reference Figure 2 The chainsaw cutting assembly 20 also includes a safety guard 203 for covering the guide plate 201 and the saw chain 202 to prevent injury.

[0205] To balance the requirements of cutting performance and lightweight design, refer to Figures 1 to 4 This application also provides a chainsaw 100, including a housing 10, a cutting assembly 20, a motor 30, and a battery pack 40. The cutting assembly 20 is mounted on the housing 10 and includes a guide plate 201 and a saw chain 202 arranged around the guide plate 201. The guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is mounted inside the housing 10 and configured to drive the saw chain 202 to move around the guide plate 201. The battery pack 40 is mounted on the housing 10 and configured to provide electrical energy to at least the motor 30. The ratio of the rated input power of the motor 30 to the bare weight of the chainsaw 100 is greater than or equal to 778 W / kg, where the bare weight of the chainsaw 100 is the weight of the chainsaw without the guide plate 201, saw chain 202, and battery pack 40. The battery pack 40 includes multiple battery cells configured as all-tab cells. The rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V.

[0206] This application also provides a chainsaw 100, including a housing 10, a cutting assembly 20, a motor 30, a battery pack 40, and a main handle 501. The cutting assembly 20 is mounted on the housing 10 and includes a guide plate 201 and a saw chain 202 arranged around the guide plate 201. The guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is mounted inside the housing 10 and configured to drive the saw chain 202 to move around the guide plate 201. The battery pack 40 is mounted on the housing 10 and configured to provide power to at least the motor 30. The main handle 501 is arranged along the length extension direction L of the chainsaw and includes a gripping section for the user to hold. The battery pack 40 includes multiple battery cells, which are configured as all-tab battery cells. The rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. The motor 30 is configured as an external rotor motor.

[0207] The grip section of the main handle 501 is the part that the user can grip and lift the chainsaw for cutting operations. Parts that are difficult for the user to grip or that are inconvenient for cutting operations when gripped should not be considered as grip sections.

[0208] It is understood that the technical solution of this embodiment, by using all-tab battery cells in the battery pack 40, setting the battery pack 40 to a high voltage, and using an external rotor motor in the motor 30, is beneficial in balancing the requirements of high power and lightweight design, while also improving the cutting efficiency of the chainsaw. For users, high power can also improve cutting efficiency, shorten working time, and thus create greater economic benefits for the landscaping team.

[0209] In some embodiments, refer to Figures 1 to 4 The grip section of the main handle 501 is at least partially located above the motor 30 in the height extension direction of the chainsaw; the rated input power of the motor 30 is greater than or equal to 1200W and less than or equal to 3200W.

[0210] Furthermore, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 3200W, and the bare weight of the chainsaw is less than or equal to 3Kg. For example, the rated input power of the motor 30 can be 1200W, 1300W, 1400W, 1500W, 1600W, 1800W, 2000W, 2400W, 2500W, 2800W, 3000W, 3200W, etc., and the bare weight of the chainsaw can be 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.6Kg, 2.7Kg, 2.8Kg, 3Kg, etc.

[0211] In some embodiments, refer to Figure 17The battery pack 40 includes a front side 401 near the cutting assembly 20 and a rear side 402 away from the cutting assembly 20 along the length extension direction L of the chainsaw 100. One side of the front side 401 of the battery pack 40 is defined as the front side front region F1, and the other side is defined as the front side rear region F2. The gripping sections of the cutting assembly 20 and the main handle 501 are both located within the front side front region F1, and the rear side 402 of the battery pack 40 is located within the front side rear region F2. The rated input power of the motor 30 is greater than or equal to 600W and less than or equal to 1200W.

[0212] Furthermore, the rated input power of the motor is greater than or equal to 600W and less than or equal to 1200W, and the bare weight of the chainsaw is greater than or equal to 1Kg and less than or equal to 2Kg. For example, the rated input power of the motor 30 can be 600W, 630W, 700W, 750W, 800W, 850W, 900W, 930W, 960W, 1000W, 1100W, 1200W, etc., and the bare weight of the chainsaw can be 1Kg, 1.05Kg, 1.1Kg, 1.2Kg, 1.3Kg, 1.38Kg, 1.4Kg, 1.45Kg, 1.5Kg, 1.6Kg, 1.7Kg, 1.8Kg, 1.9Kg, 2Kg, etc.

[0213] In some embodiments, the rated input power of the motor is greater than or equal to 600W and less than or equal to 900W, and the bare weight is greater than or equal to 1Kg and less than or equal to 1.5Kg. As one example, the rated input power of the motor is 600W and the bare weight is 1.05Kg; as another example, the rated input power of the motor is 630W and the bare weight is 1.38Kg; as yet another example, the rated input power of the motor is 850W and the bare weight is 1.45Kg.

[0214] In other embodiments, the motor's rated input power is greater than or equal to 900W and less than or equal to 1200W, and the bare motor weight is greater than or equal to 1Kg and less than or equal to 2Kg. As one example, the motor's rated input power is 930W and the bare motor weight is 1.1Kg; as another example, the motor's rated input power is 960W and the bare motor weight is 1.9Kg; as yet another example, the motor's rated input power is 1200W and the bare motor weight is 2Kg.

[0215] Furthermore, referring to Figure 17 The chainsaw motor 30 is positioned above the cutting assembly 20. This structure effectively utilizes space, making the chainsaw more compact in its length direction L. It is understood that the chainsaw in this embodiment is a low-power chainsaw, and users have certain requirements regarding its small size, light weight, and portability. Therefore, it is necessary to balance the chainsaw's cutting capacity with a compact structure and light weight.

[0216] Based on this, all technical features or combinations of technical features in the foregoing embodiments can be applied to this embodiment as long as they do not contradict or conflict with this embodiment. To keep the description concise, not all possible combinations of each technical feature will be described.

[0217] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict or conflict with each other, they can be freely combined and applied to the same embodiment.

[0218] It's understandable that high-power operation of a motor results in a higher temperature rise compared to low-power operation. Therefore, to meet high-power requirements, an increase in temperature is likely. If operation exceeds a certain temperature, it can lead to tool burnout or reduced lifespan. High heat generation can also trigger temperature protection, preventing the tool from operating continuously. Therefore, it's necessary to increase power while maintaining the temperature below the safe point (i.e., stable temperature rise) and without triggering temperature protection to ensure continuous tool operation and a long lifespan.

[0219] To address the aforementioned technical issues, this application also provides a chainsaw with good heat dissipation performance, which reduces temperature rise and increases power while maintaining stable temperature rise. This allows the chainsaw to operate safely and continuously even when outputting high power, without triggering temperature protection.

[0220] Reference Figures 1 to 3 A chainsaw 100 extends along three orthogonal spatial directions: length extension direction L, width extension direction W, and height extension direction H. The chainsaw 100 includes a housing 10, a cutting assembly 20, a motor 30, and a battery pack housing 104. The cutting assembly 20 is mounted in the housing 10 and includes a guide plate 201 and a saw chain 202 surrounding the guide plate 201. The guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is mounted inside the housing 10 and configured to drive the saw chain 202 to move around the guide plate 201. The battery pack housing 104 is configured to house a battery pack 40, which is configured to provide power to at least the motor 30.

[0221] The rated output power of motor 30 is greater than or equal to 1600W and less than or equal to 3200W; the bare weight of the chainsaw is less than or equal to 3.5Kg, wherein the bare weight of chainsaw 100 is the weight of the chainsaw without the guide plate 201, saw chain 202 and battery pack 10 installed.

[0222] Reference Figure 14The chainsaw 100 also includes an electronic control unit 60 and a temperature detection unit 70. The electronic control unit 60 is configured to control at least the starting and stopping of the motor 30; the temperature detection unit 70 is located on and communicatively connected to the electronic control unit 60, and is configured to collect temperature data from the electronic control unit 60. The electronic control unit 60 is configured as follows:

[0223] Step S1: Receive temperature data from the electronic control device 60 sent by the temperature detection device 70;

[0224] Step S2: Compare the temperature data of the electronic control device 60 with the preset temperature threshold to determine whether the temperature protection conditions are met.

[0225] Step S3: When the temperature protection conditions are met, execute the temperature protection action;

[0226] The preset temperature threshold is less than or equal to 150℃.

[0227] It is understandable that the preset temperature threshold is set based on a safe temperature point. By setting temperature protection, the chainsaw can be guaranteed to operate below the safe temperature point. According to actual needs, the preset temperature threshold is configured such that within this temperature range, the components of the motor 30 and the electronic control device 60 will not be damaged, the tool will not burn out, and the chainsaw's lifespan will not be affected.

[0228] The chainsaw in this embodiment can achieve both high power and lightweight design while maintaining stable temperature rise.

[0229] All the technical features of the foregoing embodiments can be applied to the chainsaw of this embodiment. For the sake of brevity, not all possible combinations of each technical feature are described. However, as long as the combination of these technical features does not contradict or conflict with each other, they can be freely combined and applied to the same embodiment.

[0230] Furthermore, the bare weight of the chainsaw can be 1.5Kg, 1.8Kg, 2Kg, 2.2Kg, 2.35Kg, 2.55Kg, 2.7Kg, 2.8Kg, 3Kg, 3.5Kg, etc. Optionally, the bare weight of the chainsaw is less than 3Kg. Even more optionally, the bare weight of the chainsaw is less than or equal to 2.7Kg.

[0231] In some embodiments, the ratio of the rated output power of the motor 30 to the bare weight of the chainsaw is greater than 800 W / Kg. Exemplarily, the ratio of the rated input power of the motor 30 to the bare weight of the chainsaw 100 can be 801 W / Kg, 850 W / Kg, 900 W / Kg, 940 W / Kg, 1000 W / Kg, 1070 W / Kg, etc.

[0232] Furthermore, the rated output power of the motor 30 can be 1600W, 1800W, 2000W, 2100W, 2400W, 3000W, 3200W, etc. Optionally, the rated input power of the motor is greater than or equal to 2100W.

[0233] Optionally, the rated output power of the motor 30 is greater than or equal to 2100W and less than or equal to 3000W; the bare weight of the chainsaw 100 is less than or equal to 3Kg.

[0234] Further, the preset temperature threshold can be 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, etc. Optionally, the preset temperature threshold is greater than or equal to 80℃ and less than or equal to 130℃.

[0235] In some embodiments, the condition for meeting the temperature protection requirement is configured as follows: the temperature data of the electronic control device is greater than or equal to a preset temperature threshold. That is, it is determined whether the temperature data of the electronic control device is greater than or equal to the preset temperature threshold. If it is, it is determined that the temperature protection requirement is met; otherwise, it is determined that the temperature protection requirement is not met. Specifically, the electronic control device 60 compares its temperature data with the preset temperature threshold. When the temperature data of the electronic control device 60 is greater than or equal to the preset temperature threshold, a temperature protection action is performed.

[0236] In some embodiments, the temperature protection action is configured to: control the motor 30 to stop. That is, the electronic control device 60 compares the temperature data of the electronic control device 60 with a preset temperature threshold, and controls the motor 30 to stop when it determines that the temperature protection conditions are met.

[0237] In some embodiments, refer to Figure 15 The electronic control device 60 is further configured to: when the motor is stopped, if the temperature data of the electronic control device 60 is less than a preset recovery threshold, control the motor 30 to restart, where the preset recovery threshold is less than the preset temperature threshold. By setting this step, the chainsaw can automatically restart when the temperature drops below the safe temperature point, so that the user can quickly and easily know that the tool can continue to be used.

[0238] As one specific example, the preset temperature threshold is 110℃, and the preset recovery threshold is 100℃. As another specific example, the preset temperature threshold is 105℃, and the preset recovery threshold is 95℃. As yet another specific example, the preset temperature threshold is 110℃, and the preset recovery threshold is 105℃.

[0239] In a specific example, refer to Figure 12The electronic control device 60 includes a control board 601, on which a MOSFET 6011 is mounted. A temperature detection device 70 is configured as a temperature sensor 701, which is attached to the MOSFET 6011. It is understood that frequent operation of the MOSFET generates considerable heat; the MOSFET is the primary heat-generating component. Before the MOSFET reaches a preset temperature threshold, neither the motor 30 nor other electronic components of the control board 601 will reach that preset temperature threshold. Therefore, by detecting the temperature of the MOSFET 6011 using the temperature sensor 70 and setting corresponding control strategies, it can be ensured that both the motor 30 and the electronic control device 60 operate below a safe temperature range.

[0240] Reference Figure 15 The temperature control methods of the control board specifically include:

[0241] Step S1.1: Receive temperature data from the control board 601 sent by the temperature sensor 701;

[0242] Step S2.1: Compare the received temperature data of the control board 601 with the preset temperature threshold. If the temperature data of the control board 601 is greater than or equal to the preset temperature threshold, it is determined that the temperature protection conditions are met; otherwise, it is determined that the temperature protection conditions are not met.

[0243] Step S3.1: When the temperature data on the control board is greater than or equal to the preset temperature threshold, control the motor to stop;

[0244] When the motor is stopped, if the temperature data on the control board is lower than the preset recovery threshold, the motor will restart after 30 seconds.

[0245] The preset temperature threshold is set to 110℃, and the preset recovery threshold is set to 100℃.

[0246] Understandably, to maintain stable temperature rise while increasing power, one possible solution is to improve heat dissipation, and another is to reduce heat generation. High power also leads to higher temperature rise. Even if the battery pack and motor can provide high power, if the chainsaw itself cannot meet the heat dissipation requirements, overheating will prevent the chainsaw from operating at high power. During chainsaw operation, the motor 30 and electronic control device 60 are the main heat sources. To avoid the chainsaw 100 stopping due to overheating, more effective heat dissipation for the motor 30 and electronic control device 60 inside the housing 10 needs to be considered.

[0247] To reduce heat generation, the battery pack 40 includes multiple cells, all of which are all-tab cells. All-tab cells have the advantage of low internal resistance, thus generating less heat under the same discharge current. Less heat generation allows the battery pack to maintain a low temperature rise under higher discharge currents, meaning the battery pack can operate safely at higher discharge currents and, at the same voltage, can increase the output power of the battery pack. Furthermore, it's understandable that for a battery pack, since the maximum current carrying capacity of a cell is limited—that is, the maximum current a cell can withstand under specific conditions—increasing the battery pack's power often requires more cells when the required voltage is fixed. This leads to an increase in battery pack weight, which is detrimental to overall device lightweighting. All-tab cells, with their high current carrying capacity, can achieve the same output power with fewer cells, contributing to overall device lightweighting.

[0248] In some embodiments, the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. Exemplarily, the rated voltage of the battery pack can be 36V, 38V, 40V, 48V, 54V, 60V, 80V, 100V, etc. Optionally, the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. Preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 100V. More preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 80V. In one specific embodiment, the rated voltage of the battery pack is 54V.

[0249] It is understood that power equals the product of voltage and current, and the higher the current, the more heat is generated. Therefore, under the same output power, the higher the voltage and the lower the current, the less heat is generated. That is, under the same output power, this embodiment can reduce heat generation by using high voltage, thus making it less likely to trigger temperature protection, ensuring that the motor can continue to operate stably under high power, and reducing losses and extending battery pack life.

[0250] Furthermore, the discharge rate of the battery pack is 5-20C. Exemplarily, the discharge rate of the battery pack can be 5C, 7.5C, 10C, 15C, 20C, etc. Optionally, in some embodiments, the discharge rate of the battery pack is 7.5-12C. Exemplarily, the discharge rate of the battery pack can be 7.5C, 10C, 12C, etc. As a specific example, the discharge rate of the battery pack is 10C. Here, C is a multiple of the battery capacity. For example, a 1Ah battery that discharges 1Ah of energy in 1 hour has a discharge rate of 1C.

[0251] It is understandable that the higher the discharge rate of the battery pack, the stronger the discharge capacity of the battery pack, the more electrical energy the battery pack can release in a shorter time, the faster the discharge speed, and the higher the cutting efficiency of the tool.

[0252] To improve the heat dissipation effect of the tool, in some embodiments, reference is made to Figures 5 to 9 The electronic control device 60 is disposed inside the housing 10, which has an air inlet 802 and an air outlet 803 communicating with the outside. The chainsaw also includes an axial fan 801, which is disposed inside the housing 10 and configured to draw cooling air into the interior of the housing 10 from the air inlet 802. The motor 30 is connected to and drives the axial fan 801 to rotate around the fan axis F. The orthographic projection of the axial fan 801 on the first plane P1 is at least partially coincident with or tangent to the orthographic projection of the electronic control device 60 on the first plane P1. The first plane P1 is a plane perpendicular to the fan axis F and parallel to the height extension direction H. In the extension direction of the fan axis F, the axial distance L1 between the axial fan 801 and the electronic control device 60 is configured to be less than or equal to 50 mm.

[0253] Furthermore, the axial distance L1 between the axial fan 801 and the electronic control device 60 is configured to be 2mm to 50mm. Optionally, the axial distance L1 can be configured to be 2mm to 10mm; or, the axial distance L1 can be configured to be 10mm to 16.8mm; or, the axial distance L1 can be configured to be 16.8mm to 20mm; or, the axial distance L1 can be configured to be 20mm to 35mm; or, the axial distance L1 can be configured to be 35mm to 40mm; or, the axial distance L1 can be configured to be 40mm to 50mm. For example, the axial spacing L1 can be configured as 2mm, 5mm, 8mm, 11mm, 13mm, 15mm, 16mm, 16.8mm, 17mm, 18mm, 22mm, 28mm, 33mm, 35mm, 36mm, 38mm, 40mm, 43mm, 45mm, 47mm, 48mm, or 50mm. Preferably, the axial spacing L1 is configured as 16.8mm.

[0254] It is understandable that, under the premise that the position of the motor 30 relative to the axial fan 801 remains unchanged, if the position of the electronic control device 60 is further moved closer to the axial fan 801, the closer the electronic control device 60 is to the axial fan 801, the larger the flow area of ​​the cooling air on the surface of the electronic control device 60 and the larger the airflow, resulting in a better cooling effect. However, if the distance between the two is too small, the axial fan 801 is prone to deformation after long-term operation, and the edge of the fan blades of the axial fan 801 may scrape against the electronic control device 60, causing unnecessary damage to both the axial fan 801 and the electronic control device 60. The technical solution of this embodiment can both increase the flow area of ​​the cooling air blown out from the air outlet side S2 of the axial fan 801 on the electronic control device 30, increase the airflow, and improve the heat dissipation effect, and reserve a safe distance between the axial fan 801 and the electronic control device 60 to avoid scraping the electronic control device 60 due to the deformation of the fan blades of the axial fan 801.

[0255] In some embodiments, the axial fan 801 includes an air inlet side W1 and an air outlet side W2 located on opposite sides of its axial direction; the motor 30 and the electronic control device 60 are both disposed on the air outlet side W2 of the axial fan 801; the orthographic projection of the motor 30 on the second plane P2 is at least partially located within the orthographic projection of the electronic control device 60 on the second plane P2, the second plane P2 being a plane parallel to both the fan axis F and the height extension direction H.

[0256] In some embodiments, the motor 30 includes an outer wall 303 extending axially upward on its power output shaft; the electronic control device 60 includes a heat sink 602 disposed opposite to the outer wall 303 in the length extension direction L, the heat sink 602 extending substantially along the heat dissipation plane 6021 (also called the heat dissipation surface), the fan axis F being substantially parallel to the heat dissipation plane 6021; the shortest distance L2 from the fan axis F to the heat dissipation plane 6021 is configured to be 33mm to 43.5mm.

[0257] In some embodiments, the orthographic projection of the rotating surface of the axial fan 801 onto the first plane P1 is defined as the projection circle R, and the ratio L2:r1 of the shortest distance L2 from the fan axis F to the heat dissipation plane 6021 to the radius r1 of the projection circle R is configured to be greater than 1 and less than or equal to 2.5.

[0258] In some embodiments, the electronic control device 60 includes a control board 601 and a heat sink 602. The heat sink 602 is configured to conduct and dissipate the heat emitted by the control board 601 into the surrounding air to dissipate heat from the control board 601. The control board 601 includes a MOSFET 6011. The orthographic projection of the motor outer wall 303 on the second plane P2 and the orthographic projection of the heat sink 602 on the second plane P2 have at least a partial overlap area, and the orthographic projection of the MOSFET 6011 on the second plane P2 is at least partially located within the overlap area.

[0259] In some embodiments, the axial spacing D3 between the MOS transistor 6011 and the axial fan 801 is configured to be 10 mm to 80 mm in the extending direction of the fan axis F.

[0260] In some embodiments, the orthographic projection of the fan axis F onto the first plane P1 is projection point U, the orthographic projection of the MOS transistor 6011 onto the first plane P1 is projection M, and the shortest distance D4 from projection point U to projection M is configured to be 33mm to 44mm.

[0261] Furthermore, referring to Figure 12The control board 601 includes a MOSFET 6011. The orthographic projection of the MOSFET 6011 onto a preset plane lies within the region LX defined by the orthographic projection of the motor onto the preset plane PX, and its vertical distance relative to the orthographic projection of the fan axis F onto the preset plane is less than or equal to 10 mm. The preset plane PX is perpendicular to a plane perpendicular to the fan axis F. And / or, the distance D3 between the projection of the MOSFET 6011 onto the fan axis F and the projection of the axial fan 801 onto the fan axis F is configured to be 10 mm to 50 mm. The heat sink 602 is arranged parallel to the fan axis F. It is understood that frequent operation of the MOSFET generates a significant amount of heat. The MOSFET is the main heat-generating component of the electronic control device. Placing the MOSFET in areas with high airflow velocity both radially and / or axially along the motor effectively improves heat dissipation. In other words, placing the MOSFET 6011 within the projection area of ​​the motor diameter, and placing the MOSFET 6011 closer to the air outlet, results in greater airflow, higher airflow velocity, lower temperature, and better heat dissipation.

[0262] Optionally, the vertical distance between the orthogonal projection of the MOSFET 6011 on the preset plane and the orthogonal projection of the fan axis F on the preset plane is less than or equal to 5 mm. The distance D3 between the projection of the MOSFET on the fan axis and the projection of the axial fan on the fan axis is configured to be 10 mm to 30 mm. As a specific example, the distance D3 between the projection of the MOSFET on the fan axis and the projection of the axial fan on the fan axis is configured to be 20 mm. The MOSFET is positioned at this location, resulting in better heat dissipation. In a specific embodiment, the heat sink 602 extends parallel to the preset plane PX.

[0263] Furthermore, referring to Figure 9 In the direction of the extension of the fan axis F, the axial distance D1 between the end face of the motor 30 near the axial fan 801 and the end face of the axial fan 801 near the motor 30 is 0.5mm to 6mm. For example, the axial distance D1 between the end face of the motor near the axial fan and the end face of the axial fan near the motor can be 0.5mm, 1mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, etc. Optionally, the axial distance D1 between the end face of the motor near the axial fan and the end face of the axial fan near the motor is 1 to 3mm. In a specific example, the axial distance D1 between the end face of the motor near the axial fan and the end face of the axial fan near the motor is 2.2mm. It can be understood that since the airflow direction of the axial fan is axial intake and axial exhaust, by keeping the axial distance between the axial fan and the motor small, it is possible to prevent wood chips from entering the motor and affecting its normal operation.

[0264] The angle between the connecting line from any position on the MOS transistor to the center of the axial end face of the axial fan on the air outlet side and the fan axis is 10° to 60°, preferably 20° to 50°.

[0265] Furthermore, referring to Figure 12 The heat dissipation surface 6021 is arranged parallel to the fan axis F. The perpendicular distance D2 between the plane parallel to the heat dissipation surface and tangent to the motor and the tangent of the motor to the heat dissipation surface is configured to be 1mm to 40mm. For example, D2 can be configured to 1mm, 5mm, 8mm, 10mm, 20mm, 30mm, 40mm, etc. Preferably, D2 is configured to be 2mm to 10mm. In a specific example, D2 is configured to be 6.5mm. It can be understood that by maintaining an appropriate distance between the heat sink and the motor, the heat dissipation effect of the heat sink can be avoided from being affected by the heat sink being too far away from the motor, resulting in low airflow and low air velocity.

[0266] In some embodiments, refer to Figure 9 An axial fan 801 is mounted on the power output shaft of a motor 30. The motor 30 drives the axial fan 801 to rotate around the fan axis F, and the power output shaft of the motor 30 coincides with the fan axis F. The outer wall 303 of the motor includes a front end 3031 located close to the axial fan 801 and a rear end 3032 located away from the axial fan 801 in the extending direction of the fan axis F. In the extending direction of the fan axis F, the axial distance D1 between the front end of the outer wall 303 of the motor and the axial fan 801 is configured to be 0.5mm to 6mm.

[0267] In some embodiments, the axial spacing D1 can be configured to be 0.5mm to 1mm; in some embodiments, the axial spacing D1 can be configured to be 1mm to 2mm; in some embodiments, the axial spacing D1 can be configured to be 2mm to 3mm; in still other embodiments, the axial spacing D1 can be configured to be 3mm to 4mm; in yet other embodiments, the axial spacing D1 can be configured to be 4mm to 5mm; in still other embodiments, the axial spacing D1 can be configured to be 5mm to 6mm; in some embodiments, the axial spacing D1 can be configured to be 0.5mm, 1.2mm, 1.5mm, 1.8mm, 2.2mm, 2.5mm, 2.8mm, 3.2mm, 3.5mm, 3.9mm, 4.2mm, 4.5mm, 5.2mm, 5.6mm, or 6mm, and preferably, the axial spacing D1 can be configured to be 2.2mm.

[0268] In some embodiments, refer to Figure 9The housing 10 has an internal accommodating space 101, in which the axial fan 801, motor 30, and electronic control device 60 are all housed. The area between the front end of the motor outer wall 303 and the axial fan 801 forms a low-pressure airflow zone T2. The front end of the motor outer wall 303 is provided with an airflow outlet 304 that communicates with the low-pressure airflow zone T2, and the rear end of the motor outer wall 303 is provided with an airflow inlet (not shown) that communicates with the internal accommodating space 101 of the housing 10. After the cooling air flowing out from the outlet side W2 of the axial fan 801 flows over the surface of the motor outer wall 303, at least part of the cooling air enters the interior of the motor 30 from the airflow inlet and flows out from the airflow outlet 304 into the low-pressure airflow zone T2.

[0269] With this configuration, after the cooling air flowing from the outlet side W2 of the axial fan 801 passes over the surface of the motor outer wall 303, at least a portion of the cooling air enters the interior of the motor outer wall 303 from the airflow inlet and flows out to the low-pressure airflow zone T2 from the airflow outlet 304. This can be understood as the majority of the cooling air blown out from the outlet side W2 of the axial fan 801 flowing along the fan axis F across the surface of the motor outer wall 303, thus reducing the amount of cooling air that directly enters the interior of the motor 30 along the fan axis F.

[0270] In some embodiments, refer to Figures 6 to 8 The electronic control device 60 is disposed inside the housing 10, which has an air inlet 802 and an air outlet 803 communicating with the outside. The chainsaw 100 also includes an axial fan 801, which is disposed inside the housing 10 and configured to draw cooling air from the air inlet 802 into the interior of the housing 10 and discharge it from the air outlet 803 to the exterior of the housing 10. The cooling air flow path from the axial fan 801 to the air outlet 803 is defined as the air outlet path. The motor 30 is connected to and drives the axial fan 801 to rotate around the fan axis F. The motor 30 includes an outer wall 303 extending axially upward from its power output shaft. The electronic control device 60 is disposed on the air outlet path. The electronic control device 60 includes a heat sink 602 disposed opposite to the outer wall 303 in the length extension direction L. The heat sink 602 extends approximately along the heat dissipation plane 6021, which is inclined or perpendicular to the reference plane P.

[0271] See Figures 18a-18d As shown, the orthographic projection of the rotating surface of the axial fan 801 onto the first plane P1 is a projection circle R, which includes the upper semicircle R in the height extension direction H. 上 and the lower semicircle R 下 The orthographic projection of the heat sink 602 onto the first plane P1 includes the uppermost endpoint B1 and the lowermost endpoint B2 in the height extension direction H, and extends through the uppermost endpoint B1 and the lowermost endpoint B2 to the lower semicircle R of the projection circle R. 下Tangents C1 and C2 are drawn respectively. The angle ∑ formed between the two tangents C1 and C2 and the heat sink 602 is configured to be greater than or equal to 15°. The first plane P1 is a plane perpendicular to the fan axis F and parallel to the height extension direction H. It can be understood that a dividing line A2 perpendicular to the height extension direction H is drawn through the center of the projection circle R. The part of the projection circle R above the dividing line A2 is the upper semicircle R. 上 The portion of the projected circle R above the dividing line A2 is the lower semicircle R. 下 .

[0272] Provided that the housing 10 meets the requirements for accommodating the components, the electronic control device 60 can be positioned at any location that meets the above conditions. In some embodiments, the included angle ∑ can be configured to 15° to 30°; in some embodiments, the included angle ∑ can be configured to 30° to 60°; in some embodiments, the included angle ∑ can be configured to 60° to 90°; in some embodiments, the included angle ∑ can be configured to 60° to 90°; in some embodiments, the included angle ∑ can be configured to 90° to 120°; in some embodiments, the included angle ∑ can be configured to 120° to 150°. With this configuration, the cooling air blown out by the exhaust side W2 of the axial fan 801 rotates and blows out along the direction of the rotation axis F and in a tangential direction to the outer edge of the axial fan 801. The blown cooling air can flow over both the outer wall 303 of the motor and most of the surface of the heat sink 602.

[0273] In some embodiments, the orthographic projection of the electronic control device 60 onto the reference plane P at least partially coincides with the orthographic projection of the motor onto the reference plane P.

[0274] The axial fan 801 is configured to draw airflow into the housing 10 through the air inlet 802, flow through the motor 30 and the electronic control device 60, and discharge it to the outside of the housing 10 through the air outlet 803. The heat sink 602 is set at an angle of 5° to 175° relative to a plane parallel to both the fan axis F and the length extension direction L of the chainsaw 100. Exemplarily, the angle could be 5°, 15°, 30°, 75°, 90°, 160°, 175°, etc. It is understood that by tilting the heat sink 602 of the electronic control device 60 at a certain angle, wood chips entering the housing 100 during the chainsaw cutting process are prevented from accumulating on the surface of the heat sink 602, thus affecting the heat dissipation effect. Optionally, the heat sink 602 is set at an angle of 30° to 150° relative to a plane parallel to both the fan axis F and the length extension direction L of the chainsaw 100. For example, the angle can be 30°, 45°, 60°, 75°, 90°, 120°, 150°, etc.

[0275] Optionally, the heat sink 602 is tilted upwards. This avoids the accumulation of wood chips and better guides the wood chips falling on the heat sink 602 to slide off along the heat sink 602, preventing the wood chips from flying around. As a specific example, the heat sink 602 is tilted upwards at an angle of 60° relative to a plane that is parallel to both the fan axis F and the length extension direction L of the chainsaw.

[0276] Furthermore, in some embodiments, the battery pack 40 is slidably mounted on the housing 10, and the insertion direction of the battery pack 40 relative to the housing 10 is approximately parallel to the tilt direction of the electronic control device 60. It is understood that this arrangement effectively utilizes the layout space of the housing 10, making the chainsaw 100 more compact, thereby reducing the length of the housing, reducing housing material costs, and contributing to the lightweighting of the chainsaw.

[0277] In some embodiments, refer to Figure 6 and Figure 9 The heat sink 602 has several heat dissipation ribs 6022 protruding from its surface toward the motor 30, and these ribs are spaced apart. The heat dissipation ribs 6022 are configured to extend at an angle of 5° to 175° relative to the first plane P1, or to be perpendicular to the fan axis F, so that debris can slide off along the heat dissipation ribs 6022. It can be understood that the heat dissipation ribs 6022 are inclined or perpendicularly arranged on the surface of the heat sink 602, allowing debris to slide off along the ribs 6022 under the action of gravity, thus preventing debris from accumulating on the heat sink 602 and affecting the heat dissipation effect.

[0278] Optionally, the cooling rib 6022 extends at an angle of 10° to 170° relative to a plane parallel to the fan axis F and the length extension direction L of the chainsaw. More preferably, the cooling rib 6022 extends at an angle of 30° to 150° relative to a plane parallel to the fan axis F and the length extension direction L of the chainsaw. Exemplarily, this angle can be 30°, 45°, 60°, 75°, 90°, 120°, 150°, etc. Preferably, the cooling rib 6022 extends in a direction perpendicular to the fan axis F. This is more conducive to guiding sawdust to slide down in a straight line with minimal resistance under the action of gravity.

[0279] When cooling air flows over the outer wall 303 of the motor and the heat sink 602 of the electronic control device 60, the dust and debris carried in the cooling air will fall onto the bottom surface 1003 of the housing 10 under its own gravity. The dust and debris attached to the heat sink 602 can also slide onto the bottom surface 1003 of the housing 10 under the action of gravity and / or wind force due to the tilted arrangement of the electronic control device 60, the heat sink 602, and the heat sink 6022.

[0280] Based on the above-mentioned configuration of the electronic control device 60, motor 30 and axial fan 801, dust and wood chips that enter the casing 10 along with the cooling air can fall onto the bottom surface 1003 of the casing 10 under the action of gravity and / or wind force, avoiding accumulation in the heat sink 602 of the electronic control device 60 and the inside of the motor 30, which would affect the heat dissipation effect of both.

[0281] In some embodiments, refer to Figure 6 The housing 10 has a chip discharge port 804 at its bottom, which is away from the main handle 501, in the height extension direction H. The orthographic projection of the heat sink 602 on the reference plane P is at least partially coincident with or tangent to the orthographic projection of the chip discharge port 804 on the reference plane P. That is, the chip discharge port 804 is located on the bottom surface 1003 of the housing 10.

[0282] In some embodiments, the orthographic projection of the motor outer wall 303 onto the reference plane P at least partially coincides with the orthographic projection of the chip discharge port 804 onto the reference plane P.

[0283] It is understandable that the chip discharge port 804 is located at the bottom of the housing 10, which is conducive to the discharge of chips and avoids the accumulation or blockage of chips inside the housing 10, which affects heat dissipation.

[0284] Reference Figure 6 An air inlet 802 is located on one side of the housing 10, and an air outlet 803 is located at the bottom of the housing 10. The air outlet 803, located at the bottom of the housing 10, allows for unobstructed airflow, improving heat dissipation. In some embodiments, at least a portion of the chip removal port 804 constitutes the air outlet 803, meaning the air outlet 803 also functions as a chip removal port. In other embodiments, the chip removal port 804 and the air outlet 803 are independently provided.

[0285] In some embodiments, refer to Figures 6 to 8The electronic control device 60 is housed within the housing 10, which has an air inlet 802 and an air outlet 803 communicating with the outside. The chainsaw 100 also includes an axial fan 801, which is configured to draw cooling air into the housing 10 from the air inlet 802. The axial fan 801 includes an air inlet side W1 and an air outlet side W2 located on opposite sides of its axial direction. The motor 30 and the electronic control device 60 are both located on the air outlet side W2 of the axial fan 801. The motor 30 connects to and drives the axial fan 801 to rotate around the fan axis F. The motor 30 includes an outer wall 303 extending axially upward from its power output shaft. The electronic control device 60 includes a heat sink 602 disposed opposite to the outer wall 303 in the length extension direction L. An airflow channel T1 is formed between the heat sink 602 and the outer wall 303. The axial fan 801 is configured such that cooling air flows from the air inlet side W1 to the air outlet side W2 of the axial fan 801 and flows through the airflow channel T1. The cooling air flows through the outer wall 303 of the motor and at least part of the heat sink 602.

[0286] It is understandable that the airflow from the axial fan 801 can flow through both the motor 30 and the electronic control device 60 simultaneously, thereby improving heat dissipation efficiency.

[0287] Reference Figure 10 The axial fan 801 includes multiple fan blades 8011, the outermost edge of which rotates around the fan axis F to form a circular surface 8012. The motor 30 includes a main body 302 with a circular cross-section. The orthographic projection of the main body 302 onto the circular surface 8012 does not exceed the area defined by the circular surface 8012. By employing an axial fan 801, and ensuring that the diameter of the axial fan 801, i.e., the diameter R1 of the circular surface 8012, is larger than the outer diameter R2 of the main body 302 of the motor 30, the air intake volume can be increased, and the airflow can be guided through the outer wall 303 of the motor, thereby improving the heat dissipation effect.

[0288] The ratio of the diameter R1 of the axial fan 801 to the outer diameter R2 of the main body 802 of the motor 30 is set to a range of 1 to 3, preferably 1 to 1.5. In a specific example, the outer diameter R2 of the main body 802 of the motor 30 is 64 mm, and the diameter R1 of the axial fan 801 is 85 mm.

[0289] Reference Figure 11 The orthographic projection of the electronic control device 60 onto the plane containing the circular surface 8012 at least partially coincides with the circular surface 8012. It can be understood that this structural arrangement allows the airflow from the outer side of the axial fan 801 to directly blow onto the electronic control device 60, improving heat dissipation.

[0290] Reference Figure 9The projection of the electronic control device 60 onto the fan axis F is the first segment X1, and the projection of the motor 30 onto the fan axis F is the second segment X2. The first segment X1 and the second segment X2 at least partially overlap. It can be understood that this structural arrangement causes the outer walls of the electronic control device 60 and the motor 30 to at least partially intersect in the direction of the fan axis F, allowing the airflow from the axial fan 801 to simultaneously flow through both the motor 30 and the electronic control device 60, thus improving heat dissipation efficiency.

[0291] Reference Figure 5 and Figure 6 The chainsaw 100 also includes a shroud 102, located on the air inlet side W1 of the axial fan 801. The air inlet 802 is located on the shroud 102. An air guide cavity 1021, communicating with the internal accommodating space 101 of the housing 10, is formed on the inner side of the shroud 102. The air guide cavity 1021 communicates with the outside through the air inlet 802. The shape of the air guide cavity 1021 is adapted to the shape of the axial fan 801. The axial fan 801 is at least partially placed within the air guide cavity 1021. A gap exists between the inner wall of the air guide cavity 1021 and the outermost edge of the axial fan 801. As an example, the radial distance between the gap between the inner wall of the air guide cavity 1021 and the outermost edge of the axial fan 801 is 0.3 mm to 10 mm. As another example, the radial distance between the gap between the inner wall of the air guide cavity 1021 and the outermost edge of the axial fan 801 is 1.5 mm. It is understood that the air deflector 102 is used to guide the airflow entering from the air inlet 802 to the axial fan 801, and to guide the airflow to the motor 30 and the electronic control device 60.

[0292] It should be noted that compared to ordinary chainsaws, chainsaws used for tree work require users to climb trees to operate them, and the operating space in trees is limited. Therefore, tree chainsaws have higher requirements for compactness and lightweight design. This application uses an axial fan instead of a centrifugal fan because the airflow channel layout of a centrifugal fan results in a larger chainsaw size, which is not conducive to the compact and lightweight design of the chainsaw. The use of an axial fan in this application can reduce the size and meet the small size requirement of chainsaws used for tree work. However, since the airflow direction of axial fans and centrifugal fans is different, the related installation structure design will also have different considerations.

[0293] To verify the heat dissipation effect of the chainsaw in this application, physical comparison tests were conducted using chainsaws employing centrifugal fans and axial fans, respectively. Under the same comparison dimensions, i.e., the same cutting conditions and the same initial temperature, when the chain speed (motor speed) of both chainsaws was greater than or equal to 18 m / s, the temperature rise difference inside the casings of both chainsaws was measured within the same time period. The comparison showed that the temperature rise value of the chainsaw using an axial fan provided in this application was at least 15% lower than that of the chainsaw using a centrifugal fan in the comparison, demonstrating that the technical solution of this application has excellent heat dissipation performance.

[0294] Furthermore, it is understandable that since centrifugal fans must be used with a volute, the use of an axial fan in this application eliminates the need for a volute, saving materials and contributing to the lightweight design of the chainsaw. It is also understandable that, under the same performance conditions, an external rotor motor is smaller and lighter than an internal rotor motor, thus reducing the overall size and weight of the machine. Additionally, it simplifies assembly and saves on mold and manufacturing costs. Therefore, the combination of an external rotor motor and an axial fan is more beneficial for the lightweight design of the chainsaw than either the combination of an external rotor motor and a centrifugal fan or the combination of an internal rotor motor and an axial fan. Furthermore, testing shows that the total cooling airflow is increased by 2 times, and the temperature rise is reduced by 20°C, meaning it benefits both lightweight design and improved heat dissipation performance of the chainsaw.

[0295] Reference Figure 16 This application also provides a chainsaw 100, including a housing 10, a cutting assembly 20, a motor 30, and a battery pack 40. The cutting assembly 20 is mounted on the housing 10 and includes a guide plate 201 and a saw chain 202 surrounding the guide plate 201. The guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is mounted inside the housing 10 and configured to drive the saw chain 100 to move around the guide plate 201 for cutting operations. The battery pack 40 is attached to the housing 10 and configured to provide power to the motor. The chainsaw also includes a main handle 501. The cutting assembly 20 is disposed at one end of the housing 10 in the length extension direction L of the chainsaw, and the main handle 501 is disposed at the other end of the housing away from the cutting assembly 20 in the length extension direction of the chainsaw, i.e., at the rear of the housing 10.

[0296] Furthermore, the chainsaw also includes an auxiliary handle 502, which is at least partially disposed on the left side of the housing 10 in the width extension direction of the chainsaw. Exemplarily, the auxiliary handle 502 is partially disposed on the upper part of the housing 10 and partially disposed on the left side of the housing 10. In use, the user typically holds the main handle 501 with their right hand and the auxiliary handle 502 with their left hand. The auxiliary handle 502 cooperates with the main handle 501 to facilitate user operation of the chainsaw 100.

[0297] It should be noted that as long as the technical features of the foregoing embodiments do not contradict or conflict with this embodiment, they can all be applied to this embodiment, and the technical features can be combined arbitrarily. For the sake of brevity, they will not be repeated here.

[0298] Preferably, for chainsaws with the main handle 501 located above the housing 10, the rated input power of the motor 30 is configured to be greater than or equal to 1200W and less than or equal to 3200W. Preferably, for chainsaws with the main handle 501 located at the rear of the housing 10, the rated input power of the motor 30 is configured to be greater than or equal to 2500W and less than or equal to 5500W.

[0299] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict or conflict with each other, they can be freely combined and applied to the same embodiment.

[0300] To achieve a lighter weight for the chainsaw, structural improvements have been made to better meet the requirements for lightweight design.

[0301] In some embodiments, refer to Figure 6 The chainsaw housing 10 is at least partially a single-layer wall, and a plurality of reinforcing ribs 105 are provided on the single-layer wall. Furthermore, the battery pack housing 104 is at least partially a single-layer wall, and a plurality of reinforcing ribs 105 are provided on the single-layer wall. By making the housing 10 a thin-walled structure, the chainsaw can be made lighter. By adding reinforcing ribs 105 to the thin wall, the impact resistance of the housing 10 can be improved, thereby achieving a lighter weight as much as possible while meeting the strength requirements of the chainsaw.

[0302] Further, the thickness of the single-layer wall is 1.2mm to 3mm, and the dimension of the reinforcing rib 105 in the thickness direction of the single-layer wall is 3mm to 5mm. Optionally, the thickness of the single-layer wall is 1.4mm to 2.5mm, and the dimension of the reinforcing rib 105 in the thickness direction of the single-layer wall is 3.5mm to 5mm. As a specific example, the thickness of the single-layer wall is 1.6mm, and the dimension of the reinforcing rib 105 in the thickness direction of the single-layer wall is 4mm. In some embodiments, the reinforcing rib 105 is arranged perpendicular to the single-layer wall, and the reinforcing rib 105 is integrally formed with the single-layer wall. In addition, in some embodiments, the housing 10 is made of lightweight plastic material, which also helps to reduce the weight of the chainsaw.

[0303] In some embodiments, the battery pack receiving portion 104 includes a surrounding wall and an opening formed by the surrounding wall for inserting and installing the battery pack 40. The surrounding wall includes a bottom wall and several side walls, including a front side wall, a rear side wall, a left side wall, and a right side wall. At least a portion of the surrounding wall of the battery pack receiving portion 104 is a perforated structure with several through holes.

[0304] Furthermore, in some embodiments, the bottom wall of the battery pack receiving portion 104 is a hollow structure with several through holes. In some embodiments, the left or right side wall of the battery pack receiving portion 104 is a hollow structure with several through holes. By making part of the surrounding wall of the battery pack receiving portion 104 a hollow structure, the overall weight can be further reduced. In addition, making the bottom wall a hollow structure is beneficial for weight reduction, and also allows debris entering the battery pack receiving portion 104 to be discharged through the through holes in the bottom wall, preventing debris from accumulating inside the battery pack receiving portion 104 and reducing the product's heat dissipation performance, thus also facilitating heat dissipation.

[0305] In some embodiments, the auxiliary handle 502 is a hollow structure. It is understood that by making the auxiliary handle 502 a hollow structure while ensuring strength, the bare weight of the chainsaw can be reduced, which is beneficial for the lightweight design of the chainsaw.

[0306] To demonstrate the technical effectiveness of the proposed solution, a chainsaw used for tree cutting was selected as an example. Two chainsaws suitable for the same cutting conditions were compared and tested under the same conditions (same cutting conditions, same operator, etc.), as shown in the table below.

[0307]

[0308]

[0309] By comparison, the chainsaw provided in this application, under the same cutting conditions, takes less time to cut, and its cutting efficiency is at least 15% higher than that of Comparative Examples 1 and 2. The advantage is particularly pronounced when cutting thicker square timber, i.e., under conditions with higher torque, with cutting efficiency at least 30% higher than that of Comparative Examples 1 and 2. It is evident that the chainsaw of this application has high power, light weight, and fast cutting speed, resulting in high cutting efficiency. Understandably, high cutting efficiency can significantly improve the work efficiency of landscape workers. For home use, it saves working time; for commercial use, it can create greater economic benefits. Therefore, high cutting efficiency is an extremely important requirement for landscape workers.

[0310] It should be noted that the comparative test uses a chainsaw used for tree cutting as an example, but it is not limited to this. Other chainsaws using the technical solution of this application have also been tested and have the same effect of significantly improving cutting efficiency, which will not be repeated here.

[0311] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0312] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0313] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0314] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0315] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0316] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0317] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A chainsaw, comprising: chassis; A cutting assembly, mounted on the housing, includes a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; A motor, installed inside the housing, is configured to drive the saw chain to move around the guide plate; as well as A battery pack receiving section is configured to receive a battery pack, the battery pack being configured to provide electrical power to at least the motor; The motor is characterized in that its rated input power is greater than or equal to 1200W and less than or equal to 5500W; The ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 778W / Kg, wherein the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack.

2. A chainsaw according to claim 1, characterized in that, The housing includes a main housing, which at least accommodates the motor; The chainsaw also includes a main handle, which is disposed along the length extension direction of the chainsaw; The main handle is positioned above the main housing in the height extension direction of the chainsaw; The orthographic projection of the main housing onto the reference plane P includes the leading edge of the main housing projection near the cutting assembly along the length extension direction L of the chainsaw. The orthographic projection of the motor on the reference plane P includes the leading edge of the motor projection near the cutting assembly and the trailing edge of the motor projection away from the cutting assembly in the length extension direction L of the chainsaw. In the length extension direction L of the chainsaw, the orthographic projection of the main handle on the reference plane P is at least partially located between the front edge of the projection of the main housing and the rear edge of the projection of the motor; Wherein, the reference plane P is a plane perpendicular to the height extension direction H; The ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than 800W / Kg.

3. A chainsaw according to claim 1 or 2, characterized in that, The rated input power of the motor is greater than or equal to 1800W and less than or equal to 5500W; And / or, the bare weight of the chainsaw is less than or equal to 3.5 kg.

4. A chainsaw according to claim 1 or 2, characterized in that, The ratio of the rated output power of the motor to the bare weight of the chainsaw is greater than or equal to 600W / Kg; And / or, the rated output power of the motor is greater than or equal to 1600W.

5. A chainsaw according to claim 1 or 2, characterized in that, The rated output power of the battery pack is greater than 2100W; And / or, the weight of the battery pack is less than 1.8 kg.

6. A chainsaw according to claim 1 or 2, characterized in that, The battery pack includes multiple cells, which are configured as omni-tab cells.

7. A chainsaw according to claim 1 or 2, characterized in that, The rated voltage of the battery pack is greater than 40V and less than or equal to 100V; And / or, the rated current of the battery pack is configured to be 30 to 200 A.

8. A chainsaw according to claim 1 or 2, characterized in that, The ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167 W / Kg; And / or, the energy density of the battery pack is greater than or equal to 135Wh / Kg.

9. A chainsaw according to claim 1, characterized in that, The rated input power of the motor is greater than or equal to 1200W and less than or equal to 1800W, and the bare weight of the chainsaw is greater than or equal to 1.4Kg and less than or equal to 2.3Kg. And / or, the rated input power of the motor is greater than or equal to 1800W and less than or equal to 3000W, and the bare weight of the chainsaw is less than or equal to 3Kg; And / or, the rated input power of the motor is greater than or equal to 2500W and less than or equal to 3500W, and the bare weight of the chainsaw is less than or equal to 3.4Kg; And / or, the rated input power of the motor is greater than or equal to 3200W and less than or equal to 5500W, and the bare weight of the chainsaw is less than or equal to 3.8Kg.

10. A chainsaw, comprising: chassis; A cutting assembly, mounted on the housing, includes a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; A motor, installed inside the housing, is configured to drive the saw chain to move around the guide plate; as well as A battery pack, mounted in the housing, is configured to provide electrical power to at least the motor; The characteristic is that the ratio of the rated input power of the motor to the bare weight of the chainsaw is greater than or equal to 778W / Kg, wherein the bare weight of the chainsaw is the weight of the chainsaw without the guide plate, the saw chain, and the battery pack. The battery pack includes multiple battery cells, which are configured as multi-tab battery cells. The rated voltage of the battery pack is greater than 40V and less than or equal to 100V.

11. A chainsaw according to claim 10, characterized in that, The motor is an external rotor motor.

12. A chainsaw, characterized in that, include: chassis; A cutting assembly, mounted on the housing, includes a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guiding the saw chain; A motor, installed inside the housing, is configured to drive the saw chain to move around the guide plate; A battery pack, mounted in the housing, is configured to provide electrical power to at least the motor; And a main handle, which is provided along the length extension direction of the chainsaw, the main handle including a grip section for the user to hold; The battery pack includes multiple battery cells, which are configured as multi-tab battery cells. The rated voltage of the battery pack is greater than 40V and less than or equal to 100V; The motor is configured as an external rotor motor; The grip section of the main handle is at least partially located above the motor in the height extension direction of the chainsaw; the rated input power of the motor is greater than or equal to 1200W and less than or equal to 3200W; Alternatively, the battery pack includes a front side near the cutting assembly and a rear side away from the cutting assembly along the length extension direction of the chainsaw. One side of the front side of the battery pack is defined as the front side region, and the other side is defined as the rear side region. The cutting assembly and the grip section of the main handle are both located within the front side region, and the rear side of the battery pack is located within the rear side region. The rated input power of the motor is greater than or equal to 600W and less than or equal to 1200W.

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