A power tool using a secondary battery as a drive source

Abstract

This invention discloses a very ingenious power tool structure: it includes a housing track boss and a housing track cavity in the opposite direction of the pressure position of the housing track boss, and the thin-walled position of the battery pack at the contact point with the housing track boss overlaps, controlling the battery pack's degrees of freedom in front-back, up-down, left-right, and rotational directions; and utilizes a first elastic element installed at the front end of the housing to generate normal pressure with the 45° inclined surface on the battery pack, causing the battery pack to generate downward and pushing forces. Simultaneously, the battery pack button, under the action of a spring, moves the locking inclined surface upwards towards the housing latch, generating a positive pushing force for the battery pack. The locking inclined surface of the battery pack button forms an angle of 10-45° with the plane where the battery pack track is located, and the plane where the housing latch is located also forms an angle of 10-45° with the plane where the housing track is located. Due to the stable locking of the battery pack, the connector connected to the battery pack within the housing is freed from all constraints in terms of up-down, left-right, front-back, and rotational degrees of freedom.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, specifically to a power tool that uses a rechargeable battery as a power source. Background Technology

[0002] With the continuous development and widespread application of rechargeable battery technology, traditional power tools that rely on power cords to connect to 220V or 110V AC mains power are gradually being replaced by low-voltage driven tools that use rechargeable batteries.

[0003] Low-voltage power supply has significant advantages: firstly, it is safer; secondly, it is convenient and flexible to use. In scenarios such as high-altitude operations and field operations, there is no need to connect an external extension cable or find or configure an additional power source. The tool can be pre-charged during idle time, which greatly improves the effective utilization rate of the tool.

[0004] However, most rechargeable power tools on the market currently, such as Figure 1 As shown, the issue of ensuring both a stable connection and easy insertion / removal in the battery pack and body connection structure has not yet been properly resolved. Even with a fixed connection between the battery pack and the body, it is difficult to effectively prevent friction and poor contact between the connecting plates of the battery pack output end and the body connector input end due to tool vibration. This is especially prone to arcing under high current conditions.

[0005] Furthermore, the connectors of most existing tools are rigidly fixed inside the housing. When the connector and housing, and the battery pack and housing are both rigidly fixed, the impacts and vibrations generated during tool use will directly affect the mating interface between the battery pack output and the connector input, exacerbating the relative friction and displacement between them, and further affecting the reliability of the electrical connection.

[0006] For example, Chinese patent CN210361182U discloses an electric tool including a housing. The housing includes a hinged corner for mounting a battery pack. A contact soft adhesive for contacting the battery pack is provided at the portion of the hinged corner where the gap with the battery pack is minimal. The contact soft adhesive is injection molded onto the hinged corner. In one specific embodiment, the length direction of the battery pack is collinear, parallel, perpendicular, or inclined relative to the axis of the motor within the housing. In another specific embodiment, the contact soft adhesive is provided at portions of the hinged corner opposite to the length direction of the battery pack, at portions of the hinged corner opposite to the length-direction limiting end of the battery pack, and / or at portions of the hinged corner for locking with the battery pack.

[0007] Chinese patent CN100448622C discloses a handheld power tool, which includes a housing 1, a motor disposed in the housing 1, and a battery pack that can be locked to the housing 1 for supplying current to the motor. It has at least one elastic / damping element disposed between the battery pack and the housing 1 of the handheld power tool, for damping vibration and for eliminating gaps between the battery pack and the housing 1 caused by the locking mechanism.

[0008] Chinese patent CN216671832U discloses a battery pack assembly structure for an electric tool, including a snap-fit ​​part on the battery pack and a battery mounting base on the main body of the electric tool. The snap-fit ​​part includes a snap-fit ​​protrusion, and a snap-fit ​​strip is provided on the side wall of the snap-fit ​​protrusion. The strip-shaped gap between the snap-fit ​​strip and the bottom wall of the battery pack forms a snap-fit ​​groove. The battery mounting base is provided with an assembly slide rail, and the strip-shaped gap between the assembly slide rail and the bottom wall of the battery mounting base forms an assembly slide groove. The snap-fit ​​strip can slide and engage with the assembly slide groove, and the snap-fit ​​groove can slide and engage with the assembly slide rail. The assembly slide groove is segmented along the sliding direction of the battery pack, including a sliding section and a locking section. During battery pack assembly, the snap-fit ​​strip slides from the sliding section to the locking section, and the locking section locks the snap-fit ​​strip. The engagement gap of the sliding section is larger than the engagement gap of the locking section.

[0009] Chinese patent CN222530618U discloses an electric tool, including a tool body, comprising a first housing 1, a battery mounting portion, and a first power supply terminal, wherein the battery mounting portion is disposed in the first housing 1, and the first power supply terminal is disposed in the battery mounting portion; a battery pack, comprising a second housing 1, a battery connecting portion, and a second power supply terminal, wherein the battery pack is mounted to the battery mounting portion of the tool body through the battery connecting portion; and a magnetic suction assembly, comprising a first magnetic suction component and a second magnetic suction component that cooperate with each other, wherein the first magnetic suction component is disposed in the battery mounting portion, and the second magnetic suction component is disposed in the battery connecting portion.

[0010] The existing battery pack assembly structures either fail to consider the problems caused by vibration, or only use soft rubber, elastic / damping components, magnetic components, etc., for simple buffering at local contact points. These methods are still insufficient to completely solve the problems of loose fit, poor contact, and arcing caused by vibration, thus affecting the overall durability of the device. Summary of the Invention

[0011] The purpose of this invention is to provide an electric tool with a rechargeable battery that can reliably connect the battery pack to the tool body in complex working conditions, while also improving the overall durability of the machine.

[0012] To achieve the above objectives, the basic solution of the present invention provides an electric tool using a rechargeable battery as a driving source, including a housing, a battery pack, and a connector integrated with the housing. The housing and battery pack are respectively provided with a battery pack track and a housing track that can slide together to form a gap for insertion. The battery pack has a battery pack button, and the locking ramp of the battery pack button is prevented from moving upwards by a housing latch provided on the housing under the action of a spring, forming a first locking structure. The battery pack output end of the battery pack is inserted into the connector input end of the connector, and a power source is connected to the motor of the electric tool through the connector input end to form an electrical connection. The housing track has a housing track boss at its innermost end in the insertion direction, and a housing track cavity is provided in the opposite direction to the surface of the housing track boss. The housing track boss can undergo bending deformation due to pressure within the housing track cavity.

[0013] Preferably, the angle between the locking slope of the battery pack button and the plane where the battery pack track is located is an angle within the acute angle range, preferably an angle of 10-45°, more preferably an angle of 10-30°, and particularly preferably an angle of 15°.

[0014] Preferably, the angle between the plane where the housing latch is located and the plane where the housing track is located is an angle within the acute angle range, preferably an angle of 10-45°, more preferably an angle of 10-30°, and particularly preferably an angle of 15°.

[0015] More preferably, the battery pack track has a battery pack track rib with a cavity at its bottom at the innermost end in the insertion direction, which is 1-3 times the length of the housing track boss in the insertion direction. The center of the battery pack track rib is basically located at the housing track boss. The housing track boss can be inserted into the cavity of the battery pack track rib to form a second locking structure.

[0016] Preferably, the housing has a groove at its rear end in the insertion direction, and a first elastic element is installed in the groove; the bottom surface of the groove is a plane, the width of the plane is smaller than the diameter of the circular cross-section of the groove, and the size of the groove opening is smaller than the diameter of the circular cross-section of the groove.

[0017] Preferably, the battery pack has an inclined surface at the end of the track that is higher than the track and forms an angle of approximately 45° with the track surface.

[0018] More preferably, the fixing plug piece at the input end of the plug-in socket forms a three-sided closed plug-in socket base plate boss on the plug-in socket base plate in the longitudinal position.

[0019] Preferably, the fixing plug piece of the plug input end (141) on the plug socket extends parallel to the plug socket bottom plate in the vertical direction and longitudinal position to form a plug socket top plate, and the edge of the plug socket top plate has a step.

[0020] Preferably, the housing is provided with ribs that restrict the degrees of freedom of the connector in the front-back, up-down, left-right, and rotational directions.

[0021] Preferably, the inclined surface of the jaw formed by the output terminal of the battery pack output end has a corresponding cylindrical limiting protrusion at its middle position. When the two jaws with clamping force are opened and the plug-in piece of the battery pack output end and the plug-in piece of the connector are inserted into the output terminal, the inclined surface of the jaw is pressed against the jaw, so that the output terminal clamps the input terminal.

[0022] The present invention has the following beneficial effects: 1. This invention adopts a multi-point locking and multi-directional limiting locking layout, which makes the battery pack and the power tool housing more stable in positioning, reliable in connection, and more even in force distribution, avoiding loosening, falling off or poor contact of the battery pack in complex working conditions, and ensuring reliable connection; at the same time, it can restrict the movement of the battery pack in all directions, ensuring continuous and stable electrical connection and improving the durability of the whole machine.

[0023] 2. When the battery pack of this invention vibrates under actual operating conditions, the connector can synchronize with the battery pack's vibration within a preset multi-degree-of-freedom displacement range inside the housing, including forward / backward, up / down, left / right, and rotational movements. The relative displacement between the two is controlled within a very small range. This effectively avoids problems such as repeated plugging and unplugging, relative friction, loose contact, or even intermittent connection at the interface between the battery pack's output end and the connector's input end due to vibration. It significantly reduces the risk of poor electrical connection, overheating, and signal interruption, ensuring long-term stable and reliable electrical connection.

[0024] 3. The present invention has a simple and compact structure, occupies little space, and is conducive to product miniaturization design; the locking is reliable, the positioning accuracy is high, which can effectively improve the assembly stability, and the processing and assembly costs are low, making it suitable for mass industrial production.

[0025] 4. This invention can reduce problems such as sparking, poor contact, and power outages, and improve safety in use.

[0026] 5. Under the action of the spring, the locking ramp of the battery pack button moves upward towards the housing latch, generating a downward and insertion-direction thrust on the battery pack. The two first elastic elements of the housing compress the 45° ramps on both sides of the battery pack, and the insertion ramp on the battery pack button tightly adheres to the housing latch surface, forming a three-point force distribution in a triangular pattern, firmly restraining the battery pack in the direction of rotation. During use, a slight looseness may exist. With vibration, the spring continues to push the locking ramp upward until it forms a 10-45° angle with the plane of the battery pack track, becoming increasingly tighter. When the battery pack button is pressed down, due to the ramp design, the button easily separates from the housing latch. This differs from current technology where the battery pack button requires continuous pressing to separate from the housing latch. Attached Figure Description

[0027] Figure 1 This is a diagram showing the connection between the battery pack and the casing of a commonly used handheld power tool on the market, where the control circuit, switches, motor, and other function keys are hidden.

[0028] Figure 2 This is a cross-sectional view of the battery pack and housing connection portion of the power tool of the present invention, with the housing locking key concealed.

[0029] Figure 3 This is a schematic diagram of the battery pack button in the battery pack insertion part of the power tool of the present invention.

[0030] Figure 4 This is a schematic diagram of the first working state of the locking structure in the battery pack and housing insertion part of the power tool of the present invention.

[0031] Figure 5 This is a schematic diagram of the second working state of the locking structure in the battery pack and housing insertion part of the power tool of the present invention.

[0032] Figure 6 This is a schematic diagram of the third working state of the locking structure in the battery pack and housing insertion part of the power tool of the present invention.

[0033] Figure 7 This is a schematic diagram of the structure of the housing connector in the battery pack and housing insertion part of the power tool of the present invention.

[0034] Figure 8 This is a schematic diagram of the limiting structure in the battery pack and housing insertion part of the power tool of the present invention.

[0035] Figure 9 This is a schematic diagram of the structure of the battery pack output end and the connector in the battery pack and housing insertion part of the power tool of the present invention.

[0036] The reference numerals used in the accompanying drawings include: 1-housing, 11-housing latch, 12-first elastic element, 13-groove, 131-groove slope, 132-groove bottom, 133-groove opening, 14-plug-in socket, 141-plug-in socket input end, 142-plug-in socket top plate, 143-plug-in socket bottom plate, 1431-plug-in socket bottom plate boss, 144-plug-in socket first stiffener, 145-plug-in socket second stiffener, 15-battery pack track, 151-battery pack track stiffener, 16-R contact point, 17-second locking structure, 17 1-First locking rib plate, 172-Second locking rib plate, 173-First locking boss, 174-Second locking boss; 2-Battery pack, 21-Battery pack insertion end, 22-Battery pack output end, 221-Battery pack output end base, 222-Battery pack output end parallel surface, 23-Battery cell, 231-Battery cell bracket, 24-Battery pack button, 241-Locking slope, 242-Insertion slope, 243-Battery pack button protrusion, 25-Second elastic element, 26-Housing track, 261-Housing track boss, 262-Housing track cavity. Detailed Implementation

[0037] The terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this invention indicate the orientation or positional relationship based on the accompanying drawings or the orientation or positional relationship of the power tool user. These terms are used only to simplify the description of the invention and do not indicate or imply that the components referred to must have a specific orientation or must be arranged and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. For example, in the case of a battery pack being inserted laterally along the rear of the power tool, the "front end" used in this invention refers to the direction closer to the power tool body, which is also the direction of battery pack insertion; while the "rear end" refers to the direction away from the power tool body and closer to the rear, which is also the direction of battery pack removal.

[0038] The terms “first,” “second,” “third,” etc., used in this invention are only used to distinguish structures with the same function in different locations, and should not be construed as limiting their relative importance or requiring them to be arranged and operated in a specific order.

[0039] The power tools referred to in this invention can be selected from, but are not limited to, tools that vibrate significantly during operation, such as impact hammering tools (including electric hammers, electric picks, impact drills, etc.), tightening impact tools (including impact wrenches, impact screwdrivers, etc.), garden tools (including lawnmowers, lawn trimmers, etc.), and reciprocating tools (including reciprocating saws, etc.).

[0040] The present invention provides a specific embodiment of an electric tool with a rechargeable battery, such as... Figure 2-8As shown, it mainly consists of a tool body with a housing 1 and a battery pack 2 electrically connected to the tool body. The battery pack 2 has an internal cavity for accommodating battery cells 23; it also has a battery pack insertion end 21 and a battery pack output end 22. The housing 1 has a connector 14 for inserting the battery pack insertion end 21 and connecting it to the battery pack output end 22. During insertion, sliding mating occurs via a housing track 26 on the battery pack 2 and a battery pack track 15 on the housing 1.

[0041] Battery pack 2 is an independent, detachable power supply module. Its core function is to provide stable DC power to the power tool, serving as the power source for its normal operation. Internally, it integrates battery cells 23, a protection board, and a heat dissipation structure. The outer shell is made of high-strength, insulating, and flame-retardant material, protecting the internal battery cells from impact and wear, and preventing safety hazards such as leakage, short circuits, overcharging, and over-discharging, ensuring safe use. Battery pack 2 can be installed in the pre-reserved cavity at the rear, bottom, or side of the power tool housing 1, fitting snugly into the housing. The battery pack 2 fits tightly against the housing 1, typically requiring no significant gaps. Its installation direction is usually longitudinal (along the power tool's spindle in the forward-backward direction) or vertical (along the power tool's spindle in the up-down direction). It must conform to the tool's grip or placement posture without affecting operation, while also ensuring structural stability after assembly to prevent the battery pack 2 from detaching due to vibration during use.

[0042] Specifically, such as Figure 9 As shown, the battery pack insertion end 21 is the core electromechanical interface for the connection between the battery pack 2 and the housing 1. It has a raised plug-in structure and is located at the end of the battery pack 2 facing the housing 1. The surface of the battery pack insertion end 21 integrates conductive metal output terminals to form the battery pack output end 22, which precisely matches the plug-in input end 141 of the connector 14 to achieve electrical connection from the battery pack 2 to the main unit. The plug-in input end 141 is fixed inside the battery pack mounting cavity of the power tool housing 1, precisely aligned with the battery pack output end 22, and is the core interface for receiving electrical energy from the battery pack 2. The position of the plug-in input end 141 perfectly matches the installation position of the battery pack 2; that is, when the battery pack 2 is installed at the rear of the housing 1, the plug-in input end 141 is located inside the battery pack mounting cavity at the rear of the housing 1; when the battery pack 2 is installed at the bottom of the housing 1, the plug-in input end 141 is located above the battery pack mounting cavity at the bottom of the housing 1, and so on. The connector input terminal 141 has a recessed structure with contacts on its inner side corresponding to the output terminals of the battery pack output terminal 22. A positioning guide structure is provided around its periphery to cooperate with the output terminals of the battery pack output terminal 22 to ensure accurate insertion and positioning. Simultaneously, the connector input terminal 141 is electrically connected to the control circuit board, motors, and other electrical components inside the housing 1, forming a power distribution channel.

[0043] Specifically, such as Figure 4-6 As shown, a first locking structure for locking and limiting is provided at the junction of the battery pack insertion end 21 and the corresponding connector 14 at the rear end of the power tool. The first locking structure includes a groove 13 provided on the top of the connector 14 for accommodating the first elastic member 12, and a corresponding battery pack button protrusion 243 is arranged on the battery pack insertion end 21. When the battery pack insertion end 21 is inserted into the connector 14, the battery pack button protrusion 243 compresses the first elastic member 12 upward and engages it in the groove 13 to achieve locking and limiting.

[0044] As a further preferred embodiment, a second elastic member 25 is provided at the bottom of the battery pack button protrusion 243. When the battery pack button protrusion 243 compresses the first elastic member 12 and is inserted into the groove 13, the second elastic member 25 is lifted up and presses against the bottom of the battery pack button protrusion 243, keeping the battery pack button protrusion 243 in the groove 13.

[0045] Preferably, the battery pack button protrusion 243 and the second elastic member 25 are disposed on the battery pack button 24. Specifically, the battery pack button 24 is provided with a slot, and the corresponding housing 1 is provided with an extension. When the battery pack button protrusion 243 compresses the first elastic member 12 and is inserted into the groove 13, the extension is also inserted into the slot. The second elastic member 25 is positioned below the battery pack button protrusion 243, thus fixing the battery pack button protrusion 243 in the groove 13.

[0046] Better still, a guide groove slope 131 is provided on the outer surface of the groove 13, and the width of the bottom 132 of the groove is smaller than the width of the cross-section of the first elastic member 12, ensuring that the first elastic member 12 can remain in the groove 13 and will not slip out. Multiple groove slopes 131 can be provided, and when the battery pack button protrusion 243 compresses the first elastic member 12, the groove slopes 131 are used to guide the first elastic member 12. Figure 4-6 The different working states of the first locking structure during operation are shown. It can be seen that the first elastic element 12 has already squeezed the groove slope 131 at the end of the battery pack track 15. When the tool is used, with the impact and vibration of the tool, the battery pack button 24 will continue to move upward along the housing latching surface 11 under the action of the first elastic element 12. Since the slope of the first slope 241 of the battery pack button and the slope of the housing latching surface 11 overlap and increase on the upper and lower axes, the battery pack 2 will be displaced towards the rear end of the housing 1 along the insertion direction. At this time, the displacement further increases the squeezing of the groove slope 131 at the rear end of the battery pack track 15 by the first elastic element 12. That is, as the usage time goes by, the battery pack track 15 is locked tighter and tighter in the housing track 26. The longer the usage time, the tighter the battery pack 2 is to the housing 1, and it will also prevent the power tool from loosening after long-term use.

[0047] like Figure 9 As shown, the plug base plate 143 of the plug input terminal 141, which is fixed to the plug base 141 and is assembled with the housing 1, has plug base plate bosses 1431 in three directions around its periphery. That is, the plug base plate 143 is located above the first rib plate 144 of the plug base and forms raised ribs in two width directions and along the longitudinal insertion direction of the plug piece. In addition, the plug top plate 142 extends backward in the direction perpendicular to the fixed plug piece and in the same direction as the bottom of the longitudinal position. Raised ribs and bosses are also formed on the outermost edge of the plug top plate 142 and the second rib plate 145 of the plug base below it. The four raised ribs and bosses secure the connector 14 within the housing 1. The four input tabs of the connector input end 141 are clamped by the four corresponding output terminals with elastic locking force at the battery pack output end 22. This clamping force is at least 10 times greater than the total mass of the connector 14, ensuring that during use, regardless of impact, vibration, or even a drop from a height, there will be no displacement or loosening between the four input tabs of the connector input end 141 and the four corresponding output terminals with elastic locking force at the battery pack output end 22. Specifically, after the battery pack output end 22 and the connector input end 141 are clamped together, when vibration occurs, the connector 14 vibrates with the battery pack 2, but not with the housing 1.

[0048] Regardless of the vibration of the battery pack 2, it remains tightly secured, and slight vibrations will still occur because the outer shell of the battery pack 2, the housing 1, and the connector 14 are all made of plastic. Whether the vibration is left-right, up-down, or rotational, the connector 14 will vibrate synchronously with the battery pack 2.

[0049] Based on the above structural design and spatial layout, since the outer shells of the housing 1 and the battery pack 2 are both made of plastic, after the battery pack output terminal 22 and the plug-in input terminal 141 are clamped together by inserting a spring-type terminal, the plug-in 14 and the battery pack 2 can vibrate together during vibration, but cannot vibrate with the housing 1.

[0050] That is, the connector 14 is installed inside the housing 1 and is limited by its own ribs and the housing boss. This limitation is not completely fixed, but allows the connector 14 to move within a certain range in the up-down, left-right, front-back, and rotational directions, but the amount of movement is strictly limited. When the battery pack 2 is inserted, even if there is a slight misalignment with the connector 14, the battery pack 2 can still be accurately aligned with the input end 141 of the connector and successfully inserted due to the assistance of the aforementioned output terminals and other components.

[0051] After mating, since the clamping force of the output terminal is much greater than the mass of the connector 14 itself, the connector 14 will vibrate synchronously with the battery pack 2 under vibration conditions, instead of vibrating independently with the housing 1. This can effectively avoid problems such as repeated plugging and unplugging, relative friction, loose contact, or even poor connection caused by vibration at the interface between the battery pack output terminal 22 and the connector input terminal 141. It significantly reduces the risk of poor electrical connection, overheating, and signal interruption, and ensures long-term stable and reliable electrical connection.

[0052] like Figure 6 and 8 As shown, a second locking structure is also provided at the junction of the battery pack insertion end 21 and the corresponding housing 1 at the front end of the power tool. The second locking structure includes a limiting structure formed by a first locking rib 171 and a first locking boss 173 and / or a second locking rib 172 and a second locking boss 174, provided after the battery pack 2 and housing 1 are hollowed out at corresponding positions at the front end of the power tool. Preferably, the bottom of the first locking rib 171 and the second locking rib 172 is provided with a cavity, which provides deformation space for the first locking boss 173 and the second locking boss 174. As a further preferred embodiment, the first locking boss 173 / second locking boss 174 is located at the middle position of the extended length of the housing track 26 in the battery pack 2, and the extended length of the housing track 26 is at least twice the extended length of the first locking boss 173 / second locking boss 174. Figure 8 It can be seen that the first locking boss 173 / second locking boss 174 hollowed out of the housing 1 is in contact with the first locking rib plate 171 / second locking rib plate 172 hollowed out of the battery pack 2. It can also be seen that the length of the hollowed-out portion in the battery pack 2 is approximately twice the length of the first locking boss 173 / second locking boss 174. From the contact area, it is also clear that when pressure is applied, the contact surface of the two hollowed-out portions undergoes bending deformation due to the physical properties of the material. Figure 6 It can be observed that the second elastic element 25 on the housing 1 presses against the approximately 45° inclined plane at the rear end of the plane where the battery pack track 15 is located. At this time, the battery pack 2 will generate downward and pushing forces.

[0053] like Figure 9As shown, the battery pack output terminal 22 has multiple output terminals on its output terminal base 221, and the plug-in input terminal 141 has corresponding multiple input terminals. Each output terminal includes two metal plates 222 arranged back-to-back, each forming a jaw at at least one extended end. The jaw portion of the metal plate 222 is bent to form an angle, creating a bend with the plane of the back-to-back portion. When an input terminal is inserted between the two metal plates 222 through the jaw, the metal plates 222 provide clamping force. Limiting protrusions are provided on the outer side of the inclined portion of the metal plate 222 to support and limit the metal plate 222, maintaining its clamping force on the input terminal. Specifically, each output terminal has eight raised cylindrical limiting protrusions at the midpoint between the bends of the jaws and the two parallel surfaces at the rear. When the output plates of the jaws open, i.e., when the input terminal of the connector input end 141 is inserted into the jaws, these eight arc-shaped limiting protrusions can all abut against the inclined surface at the midpoint of the jaws, thus increasing the clamping force and making the clamping tighter. Figure 9 It can also be seen that under the constraint of the left and right housings after the connector 14 is closed, there are gaps in all directions, and the protruding ribs on the connector 14 have gaps in the upper and lower positions of the corresponding positions of the housing 1.

[0054] In the use of the power tool of this invention, the left hand holds the housing 1 and the right hand holds the battery pack 2. The battery pack track 15 is aligned with the housing track 26 and inserted into the track. Initially, there is a sufficiently large gap between the housing track 26 and the battery pack track 15, making insertion very easy. The battery pack 2 can also sway left and right, up and down, but will not disengage from the track. Continuing to insert, the battery pack button 24 will first contact the R-contact point 16 on the lower part of the opposite side of the housing locking surface 11 (e.g., ...). Figure 5As shown), the R-contact 16 can compress the battery pack button 24 into the first inclined surface 241. Insertion is slightly resistant, and the battery pack button 24 can be visually observed to gradually descend under the pressure of the R-contact 16 after insertion into the first inclined surface 241, until the battery pack button protrusion 243 is fully inserted into the opposite surface of the housing locking surface 11. At this point, the rear end of the battery pack track 15 will contact the inclined surface of the housing track protrusion 261 of the housing track 26. Slight force is needed to continue inserting the battery pack 2 deeper into the track. A faint clicking sound will be heard when the battery pack 2 is almost fully inserted into the track, and a slight elasticity can be felt in the axial insertion direction. At this point, the second inclined surface 242 of the battery pack button, under the action of the spring, contacts the housing locking surface 11, locking the battery pack 2 and preventing it from retracting in the insertion direction. The core function of the spring is to provide continuous preload, pressing the second inclined surface 242 of the battery pack button tightly against the locking surface 11 of the housing, generating sufficient static friction and locking constraint between the two inclined surfaces. If the battery pack 2 has a tendency to displace in the opposite direction of insertion (i.e., the withdrawal direction), a reverse resistance force will be generated between the second inclined surface 242 of the battery pack button and the locking surface 11 of the housing. The preload of the spring will further increase the contact force between the two inclined surfaces, and the resistance force will increase simultaneously, thus firmly locking the battery pack 2 and completely preventing its withdrawal displacement in the insertion direction. The cylindrical surface of the elastic body on the housing 1 presses against the inclined surface at the rear end of the battery pack track surface, causing the battery pack 2 to generate downward and insertion-direction thrusts. The elastic bodies of the left and right housings compress the inclined surfaces on the left and right sides of the battery pack 2, and the second inclined surface 242 of the battery pack button tightly adheres to the locking surface 11 of the housing, forming a triangular three-point force exertion, thus firmly constraining the battery pack 2 in the rotational direction. Because the inclined surface at the rear end of the battery pack track 15 is designed to be inclined, when the cylindrical surface of the elastomer contacts the inclined surface, a component force will be generated due to the elastic tension of the elastomer. One component force is perpendicular to the inclined surface and points into the battery pack 2, which is converted into a downward thrust, making the bottom of the battery pack 2 fit more tightly against the bottom surface of the connector 14; the other component force is parallel to the inclined surface and points in the insertion direction of the battery pack 2, further pushing the battery pack 2 towards the connector input end 141, making the battery pack insertion end 21 contact the connector input end 141 more tightly, which not only improves the stability of power transmission, but also further strengthens the locking effect of the insertion direction.

[0055] Furthermore, the angle between the locking ramp 241 of the battery pack button 24 and the plane where the battery pack track 15 is located is an angle within the acute angle range, preferably an angle of 10-45°, more preferably an angle of 10-30°, and particularly preferably an angle of 15°.

[0056] The angle between the plane where the housing latch 11 is located and the plane where the housing track 26 is located is an angle within the acute angle range, preferably an angle of 10-45°, more preferably an angle of 10-30°, and particularly preferably an angle of 15°.

[0057] If there is almost no angle between the locking bevel 241 of the battery pack button 24 and the plane where the battery pack track 15 is located, and between the plane where the housing latch 11 is located and the plane where the housing track 26 is located, the two planes are very likely to stick together tightly, causing the operation to be stiff and rigid, completely losing the freedom of movement, and making it impossible to smoothly complete the locking and unlocking.

[0058] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. An electric tool using a rechargeable battery as a driving source, comprising a housing (1), a battery pack (2), and a connector (14) integrally assembled with the housing (1), wherein the housing (1) and the battery pack (2) are respectively provided with a battery pack track (15) and a housing track (26) that can slide together to form a gap for insertion, the battery pack (2) is provided with a battery pack button (24), and the locking slope (241) of the battery pack button (24) is blocked upward by a housing latch (11) provided on the housing (1) under the action of a spring to form a first locking structure; the battery pack output end (22) of the battery pack (2) is inserted into the connector input end (141) of the connector (14), and the power supply is connected to the motor of the electric tool through the connector input end (141) to form an electrical connection; characterized in that: The housing track (26) has a housing track boss (261) at the innermost end in the insertion direction, and a housing track cavity (262) is provided in the opposite direction to the platform of the housing track boss (261). The housing track boss (261) can be subjected to pressure in the housing track cavity (262) and undergo bending deformation of the material physical properties.

2. The power tool as described in claim 1, characterized in that: The locking ramp (241) of the battery pack button (24) forms an angle of 10-45° with the plane of the battery pack track (26).

3. The power tool as described in claim 1, characterized in that: The plane where the housing latch (11) is located forms an angle of 10-45° with the plane where the housing track (26) is located.

4. The power tool as described in claim 1, characterized in that: The battery pack track (15) has a battery pack track rib (151) with a cavity at the bottom, which is 1-3 times the length of the housing track boss (261) along the insertion direction at the innermost end of the insertion direction. The center of the battery pack track rib (151) is basically located at the housing track boss (261). The housing track boss (261) can be inserted into the cavity of the battery pack track rib (151) to form a second locking structure.

5. The power tool as described in claim 4, characterized in that, The housing (1) has a groove (13) at the rear end in the insertion direction, and a first elastic element (12) is installed in the groove (13); the bottom surface of the groove (13) is a plane, the width of the plane is smaller than the diameter of the circular cross section of the groove (13), and the size of the groove opening (133) of the groove (13) is smaller than the diameter of the circular cross section of the groove (13).

6. The power tool according to claim 5, characterized in that, The battery pack (2) has an inclined surface at the end of the track surface that is higher than the track and forms an angle of about 45° with the track surface.

7. The power tool as described in any one of claims 1-6, characterized in that, The fixing plug piece of the plug input end (141) on the plug socket (14) forms a three-sided closed plug base plate boss (1431) on the plug base plate (143) in the longitudinal position.

8. The power tool as claimed in claim 7, characterized in that, The fixed plug piece of the plug input end (141) on the plug socket (14) extends parallel to the plug base plate (143) in the vertical direction and in the longitudinal position to form a plug top plate (142), and the plug top plate (142) has a step on the edge.

9. The power tool as claimed in claim 1, characterized in that, The housing (1) is provided with ribs that restrict the degrees of freedom of the plug-in seat (14) in the front-back, up-down, left-right and rotation directions.

10. The power tool as claimed in claim 9, characterized in that, The output terminal of the battery pack (2) has a corresponding cylindrical limiting protrusion at the middle position of the jaw formed by the output terminal of the battery pack (22). When the two jaws with clamping force are inserted into the output terminal of the battery pack (22) and the input terminal of the connector (14), the output terminal clamps the input terminal.

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