Handheld lithium battery wrench

Abstract

The utility model discloses a handheld lithium battery wrench which comprises a machine shell assembly, a brushless motor, an impact output assembly and a power battery pack. The impact output assembly comprises a main shaft with one end rotationally connected with the machine shell assembly and the other end connected with the T-shaped output shaft; a plurality of driven wheels are uniformly distributed around the axis of the main shaft; the output end of the brushless motor is inserted into a space enclosed by the driven wheels and engaged with the space; the inner wall of the fixed gear sleeve is meshed with the driven wheel; the impact block is sleeved on the main shaft; the elastic piece is propped between the impact block and the step surface of the main shaft; the impact guide structure comprises a V-shaped groove in the outer wall of the main shaft, a V-shaped notch in the inner wall of the impact block and a guide ball contained in the V-shaped notch, and the opening directions of the V-shaped groove and the V-shaped notch are opposite. The device is compact in structure and direct and efficient in transmission; a V-shaped groove / notch / guide bead structure enables impact guide to be stable and reliable and abrasion to be small. The impact wrench is suitable for occasions needing efficient, stable and durable impact wrenches.

Description

Technical Field

[0001] This utility model belongs to the field of power tools, specifically a handheld lithium-ion wrench. Background Technology

[0002] Wrenches are common manual or power tools, mainly used for tightening or loosening bolts, nuts, and other fasteners. With the development of technology, electric wrenches have gradually replaced traditional manual wrenches, greatly improving work efficiency. Among them, lithium-ion battery wrenches are widely used in various repair and assembly work due to their advantages such as small size, light weight, and large battery capacity.

[0003] Currently, lithium-ion battery wrenches on the market have the following problems: First, the impact structure design of traditional lithium-ion battery wrenches is relatively simple, resulting in unstable impact force and torque fluctuations during use, which affects the quality of work. Second, the power transmission efficiency of existing lithium-ion battery wrenches is low, with high energy loss, which limits battery life. Third, the impact mechanism of traditional lithium-ion battery wrenches is complex, with many parts, increasing the product failure rate and maintenance difficulty. Finally, existing handheld lithium-ion battery wrenches have poor operability, and prolonged use can easily cause operator fatigue.

[0004] Therefore, it is necessary to provide a handheld lithium-ion wrench with a simple structure, stable impact force, high power transmission efficiency, and good operability to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a handheld lithium battery wrench that addresses the technical problems of low impact accuracy, poor transmission efficiency, and short service life in existing lithium battery wrenches, and provides a handheld lithium battery wrench with a reasonable structural design, stable impact guidance, and high transmission efficiency.

[0006] To achieve the above objectives, this utility model provides a handheld lithium battery wrench, comprising:

[0007] Housing assembly; brushless motor and impact output assembly housed within the housing assembly; power battery pack connected to the housing assembly to provide power to the brushless motor;

[0008] The impact output component includes:

[0009] The main shaft is rotatably connected at one end to the housing assembly and at the other end to a T-shaped output shaft.

[0010] Multiple driven wheels are evenly distributed around the main shaft axis, and the output end of the brushless motor is inserted into the space enclosed by the multiple driven wheels and meshes with at least one driven wheel;

[0011] The gear sleeve has a toothed structure on its inner wall and its outer wall is snapped into the housing assembly; the driven wheel meshes with the inner wall of the gear sleeve.

[0012] The impact block is fitted onto the spindle;

[0013] The elastic element has one end abutting against the end face of the impact block and the other end abutting against the stepped surface of the main shaft;

[0014] At least one set of impact guiding structures, each set of impact guiding structures including: a V-groove on the outer wall of the main shaft, and a V-notch on the inner wall of the impact block; the opening direction of the V-groove and the opening direction of the V-notch are opposite; and a guide bead accommodated in the space enclosed by the V-groove and the V-notch.

[0015] In some optional embodiments of this utility model, the spindle includes a first spindle section, a second spindle section, and a third spindle section connected in sequence; the outer diameter of the second spindle section is larger than the outer diameter of the third spindle section.

[0016] The first section of the main shaft is rotatably connected to the housing assembly; the second section of the main shaft is hollowed out, and multiple driven wheels are housed in the hollowed-out section and rotatably connected to the second section of the main shaft; the first section of the main shaft is provided with a hole for the output end of the brushless motor to be inserted into the hollowed-out section; the V-groove is arranged on the outer wall of the third section of the main shaft; one end of the elastic element abuts against the end face of the second section of the main shaft.

[0017] Preferably, the spindle further includes a fourth spindle section connected to the third spindle section, the outer diameter of the fourth spindle section being smaller than the outer diameter of the third spindle section; the fourth spindle section is connected to a T-type output shaft via a spline.

[0018] Preferably, a fifth spindle section is provided between the second and third spindle sections, and the outer diameter of the fifth spindle section is larger than the outer diameter of the second spindle section; the elastic element abuts against the end face of the fifth spindle section.

[0019] In some optional embodiments of this utility model, the end face of the impact block is provided with an annular groove, and one end of the elastic element abuts against the bottom of the annular groove.

[0020] Preferably, a ball bearing is provided between the elastic element and the bottom of the annular groove, and a ball bearing retainer ring is provided between the ball bearing and the elastic element.

[0021] In some optional embodiments of this utility model, two sets of symmetrically arranged impact guide structures are provided. In some optional embodiments of this utility model, an auxiliary handle is provided on the outer wall of the housing assembly.

[0022] The handheld lithium battery wrench provided by this utility model has the following beneficial effects:

[0023] 1. Using a brushless motor as the power source, it has higher efficiency, longer service life and lower maintenance costs compared to traditional brushed motors;

[0024] 2. The impact output component adopts an impact guiding structure composed of V-groove, V-notch and guide ball, which makes the movement of the impact block on the main shaft more stable and orderly, the impact force more stable, and reduces energy loss.

[0025] 3. Multiple driven wheels are evenly distributed around the main shaft axis. The output end of the brushless motor meshes with the driven wheels, and the driven wheels mesh with the inner wall of the gear sleeve, forming a compact and efficient power transmission path, which improves the power transmission efficiency.

[0026] 4. The elastic element allows the impact block to quickly return to its original position after being impacted, ensuring a continuous and stable impact effect.

[0027] 5. The spindle adopts a multi-segment design with reasonable outer diameter settings for each segment, which ensures structural strength while reducing overall weight.

[0028] 6. An auxiliary handle is installed on the outer wall of the housing assembly, which improves the tool's operability and reduces operator fatigue.

[0029] The handheld lithium battery wrench provided by this utility model has a reasonable structural design, stable impact force, high power transmission efficiency, good operability, and long service life, and has good application prospects. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the disclosed embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0031] Figure 1 This is a three-dimensional structural diagram of a handheld lithium battery wrench according to the present invention.

[0032] Figure 2 This is a three-dimensional cross-sectional view of a handheld lithium battery wrench according to the present invention.

[0033] Figure 3 This is a three-dimensional structural schematic diagram of the impact output component in this utility model;

[0034] Figure 4 This is a three-dimensional exploded cross-sectional view of the impact output component in this utility model;

[0035] Figure 5 This is a cross-sectional schematic diagram of the impact output component in this utility model;

[0036] Figure 6 yes Figure 5 Schematic diagram of the cross section at point AA;

[0037] Figure 7 This is a schematic diagram of a specific structure of the spindle of this utility model. Detailed Implementation

[0038] The technical solution (including preferred technical solution) of this utility model will be further described in detail below with reference to the accompanying drawings and by listing some optional embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] like Figures 1 to 7 As shown, this embodiment of the present invention provides a handheld lithium-ion battery wrench. The wrench mainly includes a housing assembly 1, a brushless motor 2 and an impact output assembly 3 installed inside the housing assembly 1, and a power battery pack 4 detachably connected to the housing assembly 1 (typically the bottom of the handle 6). The power battery pack 4 provides the electrical energy required for the operation of the brushless motor 2.

[0041] The housing assembly 1 is typically made of high-strength engineering plastic or metal, providing support and protection for the internal components. The front end of the housing assembly 1 has a cavity for mounting the impact output assembly 3, and the rear end has a cavity for mounting the brushless motor 2. A grip area is located at the middle and rear end of the housing assembly 1, with a surface covered in a rubberized anti-slip texture, forming a handle 6, which improves grip comfort and safety during use. The bottom of the handle 6 is connected to the power battery pack 4 via a movable snap-fit ​​structure.

[0042] The brushless motor 2 uses a high-efficiency brushless DC motor (BLDC motor), which has higher efficiency, longer service life, and lower noise compared to traditional brushed motors. The brushless motor 2 has a built-in control circuit board that can precisely control the motor's speed and torque output to adapt to different working requirements. The motor's output shaft is designed with a special shape that allows it to be directly inserted into the space enclosed by the driven wheels 32 and mesh with at least one driven wheel 32 to achieve power transmission.

[0043] The power battery pack 4 uses a high-energy-density lithium-ion battery pack, typically composed of multiple lithium battery cells connected in series, providing a 136V operating voltage. The power battery pack 4 is connected to the housing assembly 1 via a quick-release snap-fit ​​connection, facilitating rapid battery replacement. The battery pack incorporates overcharge protection, over-discharge protection, and short-circuit protection circuits to ensure safe operation.

[0044] The core innovation of the handheld lithium-ion wrench in this embodiment lies in the structural design of the impact output component 3. The impact output component 3 includes: a main shaft 31, multiple driven wheels 32, a toothed sleeve 33, an impact block 34, an elastic element 35, and at least one set of impact guide structures 36.

[0045] The main shaft 31 is the core component of the impact output assembly 3. One end is rotatably connected to the housing assembly 1, and the other end is connected to the T-shaped output shaft 37. The main shaft 31 is made of high-strength alloy steel and undergoes heat treatment to enhance its hardness and wear resistance. One end of the main shaft 31 is rotatably connected to the housing assembly 1 via a bearing, ensuring its smooth rotation within the housing assembly 1. The other end of the main shaft 31 is connected to the T-shaped output shaft 37, which is used to connect various wrench sockets to achieve tightening or loosening operations on fasteners such as bolts and nuts.

[0046] like Figure 7 As shown, in this embodiment, the main shaft 31 includes a first main shaft section 311, a second main shaft section 312, and a third main shaft section 313 connected in sequence. The outer diameter of the second main shaft section 312 is larger than that of the third main shaft section 313, forming a stepped surface. The first main shaft section 311 is rotatably connected to the housing assembly 1 via bearings, ensuring that the main shaft 31 can rotate smoothly within the housing assembly 1. The second main shaft section 312 is designed with a hollow structure, that is, the central part is hollowed out to form a cavity, and multiple driven wheels 32 are housed in the hollow cavity and rotatably connected to the second main shaft section 312 via bearings. The first main shaft section 311 is provided with a through hole, which communicates with the hollow cavity of the second main shaft section 312, for the output end of the brushless motor 2 to be inserted into the hollow cavity and engage with the driven wheels 32. The outer wall of the third main shaft section 313 is provided with a V-groove 361, which serves as part of the impact guide structure 36. One end of the elastic element 35 abuts against the end face of the second section 312 of the main shaft, providing elastic return force for the impact block 34.

[0047] Multiple driven wheels 32 are evenly distributed around the axis of the main shaft 31, typically three or four. Each driven wheel 32 is gear-shaped and can mesh with the output shaft of the brushless motor 2 and the inner wall of the gear sleeve 33. The driven wheels 32 are made of high-strength alloy material and have undergone surface hardening treatment to improve wear resistance and service life. The driven wheels 32 are connected to the main shaft 31 by bearings, ensuring that the driven wheels 32 can rotate freely relative to the main shaft 31. When the output shaft of the brushless motor 2 rotates, it drives the meshed driven wheels 32 to rotate, and the driven wheels 32 mesh with the inner wall of the gear sleeve 33, thereby realizing the transmission of power and the conversion of speed.

[0048] The gear sleeve 33 is a ring-shaped structural component with a toothed inner wall. Its outer wall is clamped into the housing assembly 1 by an interference fit or other fixing method, keeping it stationary relative to the housing assembly 1. The inner toothed surface of the gear sleeve 33 meshes with the outer teeth of the driven gear 32. This structure is similar to the principle of a planetary gear mechanism, achieving the function of speed reduction and torque increase. Furthermore, the structure is very compact, and power transmission is direct. The gear sleeve 33 is made of high-strength steel, and the inner toothed surface undergoes precision machining and heat treatment to ensure the meshing accuracy and durability with the driven gear 32.

[0049] The impact block 34 is sleeved on the main shaft 31 and can slide along the axial direction of the main shaft 31. The impact block 34 is made of a special high-strength alloy material, which has good impact toughness and wear resistance. The impact block 34 is usually cylindrical in shape and has a central hole inside that mates with the main shaft 31. When the impact block 34 moves along the axial direction of the main shaft 31 and impacts the T-shaped output shaft 37, it can generate instantaneous high torque output.

[0050] The elastic element 35 is typically a helical compression spring, with one end abutting against the end face of the impact block 34 and the other end abutting against the stepped surface of the main shaft 31. The function of the elastic element 35 is to provide a return force to the impact block 34, allowing it to quickly return to its initial position after each impact, ready for the next impact. The elastic element 35 is made of special spring steel and undergoes heat treatment to obtain good elasticity and fatigue resistance.

[0051] At least one set of impact guide structures 36 is disposed between the main shaft 31 and the impact block 34. Each set of impact guide structures 36 includes: a V-groove 361 disposed on the outer wall of the main shaft 31, a V-notch 362 disposed on the inner wall of the impact block 34, and a guide bead 363 accommodated in the space enclosed by the V-groove 361 and the V-notch 362.

[0052] like Figure 4 and Figure 7As shown, a V-groove 361 is provided on the outer wall of the main shaft 31 (specifically, the three sections of the main shaft 313). Its shape is "V", and the opening direction is set along the axial direction of the main shaft 31 and faces the first section of the main shaft 311. The two side walls of the V-groove 361 form a certain angle with the axial direction, usually 30° to 45°. This design can generate an axial component force when the impact block 34 rotates, pushing the impact block 34 to move along the axial direction.

[0053] V-shaped notch 362 is provided on the inner wall of the impact block 34. It is also V-shaped, but its opening direction is opposite to that of the V-shaped groove 361. The two side walls of the V-shaped notch 362 also form a certain angle with the axial direction, which is usually the same as or slightly different from the angle of the V-shaped groove 361, in order to optimize the impact effect.

[0054] The guide ball 363 is a high-precision steel ball housed within the space enclosed by the V-groove 361 and the V-notch 362. The diameter of the guide ball 363 is slightly smaller than the maximum width of the V-groove 361 and the V-notch 362, but larger than their minimum width, allowing the guide ball 363 to roll within the V-groove 361 and the V-notch 362 without dislodging. The guide ball 363 is made of high-hardness bearing steel and its surface is precision-ground, resulting in extremely high roundness and surface finish.

[0055] In this embodiment, two sets of impact guide structures 36 are typically provided and arranged symmetrically around the impact block 34. This ensures the stability and symmetry of the impact block 34 during movement and avoids swaying caused by unilateral force.

[0056] Working principle: When the brushless motor 2 starts, its output shaft inserts into the space enclosed by multiple driven wheels 32 and meshes with at least one driven wheel 32. While rotating, the driven wheel 32 meshes with the toothed structure on the inner wall of the gear sleeve 33. Since the gear sleeve 33 is fixed within the housing assembly 1, this meshing relationship causes the driven wheel 32 to not only rotate on its own axis but also revolve around the axis of the main shaft 31. Because the driven wheel 32 is connected to the main shaft 31 via bearings, the revolution of the driven wheel 32 drives the main shaft 31 to rotate.

[0057] When the main shaft 31 rotates, the V-groove 361 rotates with the main shaft 31, and the guide bead 363 is forced to roll within the space enclosed by the V-groove 361 and the V-notch 362. Since the opening directions of the V-groove 361 and the V-notch 362 are opposite, the movement of the guide bead 363 causes the impact block 34 to be pushed away from the elastic element 35, that is, to move axially along the main shaft 31, while simultaneously compressing the elastic element 35. When the guide bead 363 moves to the end of the V-groove 361 and the V-notch 362, the impact block 34 is pushed to its furthest position, at which point the elastic element 35 is compressed to the maximum extent.

[0058] As the main shaft 31 continues to rotate, the guide bead 363 begins to return to the starting position of the V-groove 361 and V-notch 362. At this time, under the elastic force of the elastic element 35, the impact block 34 quickly rebounds, generating a high-speed axial movement that impacts the T-shaped output shaft 37 connected to the main shaft 31, thereby generating an instantaneous high-torque impact. This impact is transmitted to the connected sleeve through the T-shaped output shaft 37, and then acts on the bolt or nut to achieve the tightening or loosening operation.

[0059] This process is repeated cyclically, generating continuous impact, which greatly enhances the wrench's output torque, while reducing the operator's burden and improving work efficiency.

[0060] In a preferred embodiment of this utility model, such as Figure 7 As shown, the spindle 31 also includes a fourth spindle section 314 connected to the third spindle section 313. The outer diameter of the fourth spindle section 314 is smaller than that of the third spindle section 313, forming another stepped surface. The fourth spindle section 314 is connected to the T-type output shaft 37 via a spline. The spline connection can transmit a large torque while allowing the T-type output shaft 37 a certain degree of axial movement freedom, facilitating the transmission of impact force. The dimensions and spline design of the fourth spindle section 314 are optimized according to the actual torque requirements and the connection requirements of the T-type output shaft 37 to ensure the reliability and durability of the connection.

[0061] In another preferred embodiment, a fifth spindle section 315 is provided between the second spindle section 312 and the third spindle section 313. The outer diameter of the fifth spindle section 315 is larger than that of the second spindle section 312, forming a convex flange structure. In this design, the elastic element 35 abuts against the end face of the fifth spindle section 315, rather than directly against the end face of the second spindle section 312. This design increases the support area of ​​the elastic element 35, making the elastic force distribution more uniform, and also enhances the strength of the spindle 31 at this location, making it suitable for applications with higher torque output.

[0062] In another embodiment of this utility model, such as Figure 4 As shown, the end face of the impact block 34 is provided with an annular groove 341, and one end of the elastic element 35 abuts against the bottom of the annular groove 341. The design of the annular groove 341 allows the elastic element 35 to be partially embedded in the impact block 34, reducing the axial length of the impact assembly and making the entire wrench structure more compact. At the same time, the annular groove 341 also plays a centering role for the elastic element 35, preventing the elastic element 35 from shifting during operation.

[0063] To further optimize the impact effect and reduce friction, in a preferred embodiment, a ball 351 is provided between the elastic element 35 and the bottom of the annular groove 341, and a ball retainer ring 352 is provided between the ball 351 and the elastic element 35. The ball 351 is typically a high-precision bearing steel ball, located between the elastic element 35 and the bottom of the annular groove 341, reducing friction between the end of the elastic element 35 and the bottom of the annular groove 341, thus making the movement of the impact block 34 smoother. The ball retainer ring 352 is an annular component that fits around the end of the elastic element 35, preventing the elastic element 35 from directly pressing on the ball 351, and also serving to position the ball 351, preventing it from shifting during operation.

[0064] In another embodiment of this utility model, two sets of symmetrically arranged impact guide structures 36 are provided. The two sets of impact guide structures 36 are arranged opposite each other in the circumferential direction of the impact block 34, for example, 180° apart. This ensures that the impact block 34 is subjected to uniform force during movement, avoids swaying, and improves impact accuracy and impact effect. Of course, according to actual needs, three or more sets of impact guide structures 36 can also be provided to adapt to different working conditions and torque requirements.

[0065] In another embodiment of this invention, an auxiliary handle 5 is provided on the outer wall of the housing assembly 1. The auxiliary handle 5 is typically located at the front or side of the housing assembly 1, allowing the user to hold it with their other hand, increasing operational stability and comfort, and is particularly suitable for use in high-torque output applications. The auxiliary handle 5 can be fixed, rotatable, or even detachable to adapt to different working environments and usage habits. The surface of the auxiliary handle 5 is also covered with an anti-slip material to improve grip comfort and safety.

[0066] This utility model's handheld lithium-ion wrench also features a multi-level torque adjustment function. Users can select different torque output levels using the knobs or buttons on the housing assembly 1 to suit various tightening needs. This adjustment is typically achieved by controlling the output power of the brushless motor 2. Higher settings are suitable for tightening or loosening large bolts, while lower settings are suitable for fine-tuning or avoiding over-tightening that could cause damage.

[0067] In addition, the handheld lithium battery wrench of this utility model can also be equipped with an LED work light. The LED work light is usually installed at the front end of the housing assembly 1, near the T-shaped output shaft 37. When the wrench is started, the LED work light will automatically turn on to illuminate the working area, improve the convenience and safety of operation, and is especially suitable for use in environments with insufficient light.

[0068] In terms of battery management, the handheld lithium battery wrench of this utility model can be equipped with a power display function. Typically, an LED power indicator or an LCD screen is set on the power battery pack 4 or the housing assembly 1 to display the remaining battery power in real time, reminding the user to charge in time and avoid interruption of work due to depletion of power.

[0069] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A handheld lithium-ion battery wrench, characterized in that, include: Housing components; The brushless motor and impact output components are housed within the housing assembly; A power battery pack connected to the housing assembly to provide power to the brushless motor; The impact output component includes: The main shaft is rotatably connected at one end to the housing assembly and at the other end to a T-shaped output shaft. Multiple driven wheels are evenly distributed around the main shaft axis, and the output end of the brushless motor is inserted into the space enclosed by the multiple driven wheels and meshes with at least one driven wheel; The gear sleeve has a toothed structure on its inner wall and its outer wall is snapped into the housing assembly; the driven wheel meshes with the inner wall of the gear sleeve. The impact block is fitted onto the spindle; The elastic element has one end abutting against the end face of the impact block and the other end abutting against the stepped surface of the main shaft; At least one set of impact guiding structures, each set of impact guiding structures including: a V-groove on the outer wall of the main shaft, and a V-notch on the inner wall of the impact block; the opening direction of the V-groove and the opening direction of the V-notch are opposite; and a guide bead accommodated in the space enclosed by the V-groove and the V-notch.

2. The handheld lithium-ion wrench according to claim 1, characterized in that: The spindle comprises a first spindle section, a second spindle section, and a third spindle section connected in sequence; the outer diameter of the second spindle section is larger than the outer diameter of the third spindle section. The first section of the main shaft is rotatably connected to the housing assembly; the second section of the main shaft is hollowed out, and multiple driven wheels are housed in the hollowed-out section and rotatably connected to the second section of the main shaft; the first section of the main shaft is provided with a hole for the output end of the brushless motor to be inserted into the hollowed-out section; the V-groove is arranged on the outer wall of the third section of the main shaft; one end of the elastic element abuts against the end face of the second section of the main shaft.

3. The handheld lithium-ion wrench according to claim 2, characterized in that: The spindle also includes a fourth spindle section connected to the third spindle section, the outer diameter of the fourth spindle section being smaller than the outer diameter of the third spindle section; the fourth spindle section is connected to a T-type output shaft via a spline.

4. The handheld lithium-ion wrench according to claim 2, characterized in that: A fifth section of the main shaft is provided between the second and third sections, and the outer diameter of the fifth section of the main shaft is larger than the outer diameter of the second section of the main shaft; the elastic element abuts against the end face of the fifth section of the main shaft.

5. The handheld lithium-ion wrench according to claim 1, characterized in that: The end face of the impact block is provided with an annular groove, and one end of the elastic element abuts against the bottom of the annular groove.

6. The handheld lithium-ion wrench according to claim 5, characterized in that: A ball bearing is provided between the elastic element and the bottom of the annular groove, and a ball bearing retainer ring is provided between the ball bearing and the elastic element.

7. The handheld lithium-ion wrench according to claim 1, characterized in that: It is equipped with two sets of symmetrically arranged impact guiding structures.

8. The handheld lithium-ion wrench according to claim 1, characterized in that: An auxiliary handle is provided on the outer wall of the housing assembly.

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