Power tool battery pack structure with multiple contact points for positive and negative terminals

Abstract

This invention discloses a power tool battery pack structure with multiple contact points and positive and negative terminals, relating to the field of battery pack technology. It includes a first housing and a second housing forming the external structure of the battery pack. Several sets of battery cells are disposed within the inner cavities of the first and second housings. A control board is disposed on the top surface of each battery cell and is electrically connected to the battery cell. A docking end is disposed on the top surface of the second housing. When the docking end docks with the power tool, because the docking end uses non-frictional electrical contact, i.e., the contact between the docking end and the power tool is non-frictional, there will be no sliding friction between the docking end and the power tool during each installation and removal of the power tool battery pack structure and the power tool. This prevents damage to the contact points between the docking end and the power tool, ensuring the effectiveness and stability of power transmission between the power tool battery pack structure and the power tool, and reducing the damage rate of the power tool battery pack structure.

Description

Technical Field

[0001] This invention relates to the field of battery pack technology, and more specifically to a power tool battery pack structure with multiple contact points for positive and negative terminals. Background Technology

[0002] The structure of a power tool battery pack refers to the battery pack used in power tools. Its features include easy installation and disassembly, rechargeable battery pack, convenient use of power tools, and multiple contact points between the positive and negative terminals, which means that the positive and negative terminals between the battery pack and the power tool have multiple connection points or contact parts, resulting in high current transmission efficiency, good connection stability, and balanced charging.

[0003] Existing power tool battery pack structures, such as the power tool and battery pack disclosed in Chinese patent application CN119381662A and the battery pack and power tool disclosed in Chinese patent application CN115347313A, use friction contact between the battery pack terminals and the power tool terminals when they are connected and mated. Because the battery pack needs to be repeatedly disassembled during use, the wear rate between the battery pack terminals and the power tool terminals is relatively high. After long-term use, this can easily lead to poor contact between the battery pack and the power tool, affecting the normal use of both the battery pack and the power tool. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a power tool battery pack structure with multiple contact points and positive and negative terminals, so as to solve the problem that in the prior art, the docking terminals on the battery pack and the docking terminals on the power tool are all in frictional contact. After long-term use, the wear rate between the docking terminals on the battery pack and the docking terminals on the power tool is large, which leads to poor contact between the battery pack and the power tool.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] Specifically, it provides a power tool battery pack structure with multiple contact points for positive and negative terminals, including a first housing and a second housing forming the external structure of the battery pack. Several sets of battery cells are arranged in the inner cavities of the first housing and the second housing. A control board is arranged on the top surface of the battery cells and is electrically connected to the battery cells. A docking end is arranged on the top surface of the second housing and is electrically connected to the control board through the second housing. The docking end is movable and non-frictionally electrically connected to the power tool.

[0007] As a further aspect of the present invention: the docking end includes a docking block, the bottom surface of the docking block is fixedly connected to the top surface of the second housing, one end of the docking block is provided with a movable terminal, and the other end of the docking block is provided with a locking mechanism.

[0008] As a further aspect of the present invention: the docking block has limit grooves on both sides, the docking block has a terminal groove that matches the moving terminal on the inner side near the moving terminal, and the docking block has an air cavity inside.

[0009] As a further aspect of the present invention: the movable terminal includes a movable block, one end of the movable block is provided with a plurality of terminal blocks, terminal slots are formed between the terminal blocks, a conductor slot is formed on one side of the terminal block, and a conductor block is provided inside the conductor slot.

[0010] As a further aspect of the present invention: the movable block has a hydraulic channel and a pneumatic channel inside. The hydraulic channel is used to drive the conductor block, one end of the pneumatic channel is connected to the conductor groove, and the other end of the pneumatic channel is connected to the air chamber.

[0011] As a further aspect of the present invention: a compression slider is provided inside the movable block near the hydraulic channel, and a compression end block is fixedly connected inside the air chamber near the compression slider.

[0012] As a further aspect of the present invention: the locking mechanism includes a movable button and an elastic locking tongue, wherein the movable button controls the position of the elastic locking tongue by displacement.

[0013] As a further aspect of the present invention: a driving inclined block is fixedly connected to the top surface of one inner end of the moving button, and a button spring is fixedly connected to the inner end face of the moving button.

[0014] As a further embodiment of the present invention: a latch slider is fixedly connected to both sides of the bottom surface of the elastic latch, and a latch groove that matches the driving inclined block is opened on the side wall of the latch slider near the position of the driving inclined block. A latch spring is fixedly connected to the center position of the bottom surface of the elastic latch.

[0015] As a further aspect of the present invention: the locking mechanism comprises a control button and an electromagnetic latch, wherein the control button controls the position of the electromagnetic latch through a circuit that opens and closes the electromagnetic latch.

[0016] The beneficial effects of this invention are:

[0017] In this invention, when the docking end connects with the power tool, it does so through non-frictional electrical connection, meaning the contact between the docking end and the power tool is non-frictional. This prevents sliding friction between the docking end and the power tool during each installation and removal process, thus avoiding damage to the contact points. This ensures the effectiveness and stability of energy transmission between the power tool battery pack structure and the power tool, and reduces the damage rate of the power tool battery pack structure. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the power tool battery pack with multiple contact points and positive and negative terminals of the present invention;

[0020] Figure 2 This is an exploded view of the electric tool battery pack structure with multiple contact points and positive and negative ends according to the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the second housing in this invention;

[0022] Figure 4 This is a front view of the second housing in this invention;

[0023] Figure 5 This is a cross-sectional view of the docking end in this invention;

[0024] Figure 6 This is a schematic diagram of the structure of the movable terminal in this invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the movable terminal in this invention;

[0026] Figure 8 This is a cross-sectional view of the locking mechanism in this invention;

[0027] Figure 9 This is a schematic diagram of the movement button in this invention;

[0028] Figure 10 This is a schematic diagram of the elastic locking tongue in this invention;

[0029] Figure 11 This is a cross-sectional view of the conductor block driven by the oil bladder in this invention.

[0030] Explanation of reference numerals in the attached drawings: 1. First housing; 11. Reception cavity; 2. Second housing; 21. Internal groove; 3. Battery cell; 4. Control board; 5. Connecting end; 51. Connecting block; 511. Limiting slide groove; 512. Terminal slide groove; 513. Air chamber; 514. Blocking groove; 515. Extrusion end block; 516. One-way valve; 52. Moving terminal; 521. Moving block; 522. Terminal block; 523. Terminal groove; 524. Conductor groove; 525. Extrusion slider; 526. Conductor block; 5261. Synchronizing rod; 527. Hydraulic channel; 5271. Oil bladder; 528. Air pressure channel; 529. Air pressure spring; 53. Locking mechanism; 531. Moving button; 532. Elastic locking tongue; 533. Drive inclined block; 534. Button spring; 535. Locking tongue slider; 536. Locking tongue spring; 537. Locking tongue inclined groove. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In one embodiment of the present invention, such as Figures 1-10 As shown, this invention discloses a power tool battery pack structure with multiple contact points for positive and negative terminals. It includes a first housing 1 and a second housing 2 forming the external structure of the battery pack. Several sets of battery cells 3 are disposed within the inner cavities of the first housing 1 and the second housing 2. The battery cells 3 are lithium polymer batteries, also known as polymer lithium-ion batteries, which are lithium-ion batteries using polymer electrolytes. The multiple contact points for positive and negative terminals refer to the locations where multiple contact points are set at the positive and negative terminals of the battery cells 3, improving the current transmission efficiency of the battery cells 3, enhancing the connection stability of the battery cells 3, and achieving balanced charging and discharging of the battery cells 3. A control board 4 is disposed on the top surface of the battery cells 3 and is electrically connected to the battery cells 3. A docking end 5 is disposed on the top surface of the second housing 2, and the docking end 5 is connected to... The second housing 2 is electrically connected to the control board 4, and the docking end 5 is movably and non-frictionally docked with the power tool. It should be noted that the power tools that the docking end 5 can be used with include electric drills, electric hammers, cutting machines, lawnmowers, etc. After the battery cell 3 in the power tool battery pack structure is fully charged, it can be docked with the power tool through the docking end 5 to provide power to the power tool and ensure that the power tool can be used normally. The first housing 1 has a storage cavity 11 inside, and the battery cell 3 and the control board 4 are both set inside the storage cavity 11 and protected by the storage cavity 11. The size and shape of the storage cavity 11 can be adaptively adjusted by those skilled in the art according to the size of the battery cell 3 and the control board 4 to ensure that the battery cell 3 and the control board 4 can be stored in the storage cavity 11.

[0033] When docking end 5 connects with the power tool, it does so through non-frictional electrical connection, meaning that the contact between docking end 5 and the power tool is non-frictional. This prevents sliding friction between docking end 5 and the power tool during each installation and removal of the power tool battery pack structure and the power tool, thus avoiding damage to the contact point between docking end 5 and the power tool. This ensures the effectiveness and stability of power transmission between the power tool battery pack structure and the power tool, and reduces the damage rate of the power tool battery pack structure.

[0034] like Figure 3As shown, the docking end 5 includes a docking block 51. The bottom surface of the docking block 51 is fixedly connected to the top surface of the second housing 2. One end of the docking block 51 is provided with a movable terminal 52, and the other end of the docking block 51 is provided with a locking mechanism 53. It should be noted that the power tool needs to be provided with a mounting groove that matches the docking block 51 and the movable terminal 52 to ensure that the docking end 5 can be effectively connected to the power tool. The mounting groove on the power tool is adapted to the shape of the docking block 51 and the movable terminal 52 by those skilled in the art, ensuring that the docking end 5 fits well with the mounting groove on the power tool. The locking mechanism 53 can fix the docking end 5 on the power tool, that is, fix the power tool battery pack structure on the power tool, ensuring that the power tool battery pack structure can continuously supply power to the power tool through the internal battery cells 3 during the operation of the power tool.

[0035] In one embodiment of the present invention, taking an electric weeder as an example, a docking groove that matches the docking end 5 can be set at a corresponding position on the electric weeder. In use, the docking end 5 is installed in the docking groove on the electric weeder. Specifically, the movable terminal 52 is connected to the power terminal on the electric weeder. In this way, the battery cell 3 can transmit electrical energy to the electric weeder through the docking end 5, so that the motor installed inside the electric weeder can rotate. The rotating motor can then perform the grass cutting operation.

[0036] During the mowing process, the electric lawnmower will vibrate. The locking mechanism 53 can lock the docking end 5 onto the electric lawnmower, ensuring a stable connection between the power tool battery pack structure and the electric lawnmower during operation.

[0037] In one embodiment of the present invention, such as Figure 4 and Figure 5 As shown, the docking block 51 has limit grooves 511 on both sides, and a terminal groove 512 that matches the moving terminal 52 is provided on the inner side of the docking block 51 near the moving terminal 52. An air cavity 513 is provided inside the docking block 51. It should be noted that, according to the specific shape of the limit groove 511, a limit slider that matches the limit groove 511 can be set at the corresponding position on the power tool by those skilled in the art. In this way, the docking block 51 can be installed on the corresponding power tool through the cooperation of the limit groove 511 and the limit slider.

[0038] To ensure the ease of installation and portability of the docking block 51 and the power tool, a pulley that fits the limiting groove 511 can be set on the limiting slider. The pulley mainly serves as a guide, ensuring that the docking block 51 can be easily installed on the limiting slider of the power tool through the limiting groove 511, thereby reducing the friction between the docking block 51 and the power tool.

[0039] A terminal groove 512 is provided on the inner side of the mating block 51 near the moving terminal 52, allowing the moving terminal 52 to slide freely within the terminal groove 512. Figure 5 Taking the position of the terminal slide groove 512 as an example, when the moving terminal 52 slides to the right in the terminal slide groove 512, the moving terminal 52 will squeeze the air chamber 513, that is, squeeze the air in the air chamber 513, which will increase the air pressure in the air chamber 513.

[0040] It should be noted that a blocking groove 514 is provided at the position of the terminal slide 512 near the air cavity 513. A blocking block that matches the blocking groove 514 is fixedly connected to the middle position of the top surface of the movable terminal 52. When the blocking block on the movable terminal 52 moves to the position of the blocking groove 514, the blocking groove 514 will cooperate with the blocking block to restrict the position of the movable terminal 52 in the terminal slide 512 and the air cavity 513, so that the position of the movable terminal 52 is stable.

[0041] In one embodiment of the present invention, such as Figure 5 , Figure 6 and Figure 7 As shown, the movable terminal 52 includes a movable block 521. One end of the movable block 521 is provided with a plurality of terminal blocks 522. Terminal slots 523 are formed between the terminal blocks 522. A conductor slot 524 is formed on one side of the terminal block 522. A conductor block 526 is provided inside the conductor slot 524. It should be noted that the movable block 521 fits into the terminal slide groove 512 and the air cavity 513 and slides in a sealed contact with the inner wall of the air cavity 513. In this way, when the movable block 521 slides inside the air cavity 513, the air inside the air cavity 513 will not leak out from the contact surface between the movable block 521 and the inner wall of the air cavity 513. The terminal blocks 522 and the terminal slots 523 are used to cooperate with power tools. Therefore, those skilled in the art should design the shape and size of the terminal blocks 522 and the terminal slots 523 according to the mating points on the power tool to ensure that the terminal blocks 522 and the terminal slots 523 can fit into the mating points on the power tool.

[0042] When the terminal block 522 and terminal slot 523 are engaged with the mating point on the power tool, the conductor block 526 can contact the conductor of the mating point on the power tool, ensuring that the electrical energy in the battery cell 3 can be delivered to the power tool. Since the conductor block 526 is slidably disposed inside the conductor slot 524, when the terminal block 522 and terminal slot 523 are embedded in the mating point on the power tool, the conductor block 526 will not slide against the conductor on the power tool. This ensures that the conductor block 526 and the conductor on the power tool will not slide and rub against each other, thus preventing wear between the conductor block 526 and the conductor on the power tool. This ensures a good contact effect between the conductor block 526 and the conductor on the power tool, avoiding wear or poor contact caused by sliding friction between the conductor block 526 and the conductor on the power tool.

[0043] like Figure 7 As shown, the movable block 521 has a hydraulic channel 527 and a pneumatic channel 528 inside. The hydraulic channel 527 is used to drive the conductor block 526. One end of the pneumatic channel 528 is connected to the conductor groove 524, and the other end of the pneumatic channel 528 is connected to the air chamber 513. It should be noted that the specific orientation of the hydraulic channel 527 and the pneumatic channel 528 inside the movable block 521 can be adaptively adjusted by those skilled in the art according to the positions of the conductor groove 524 and the conductor block 526, ensuring that the hydraulic channel 527 and the pneumatic channel 528 do not interfere with each other. In addition, it should be noted that when the air pressure in the air chamber 513 increases, since one end of the pneumatic channel 528 is connected to the conductor groove 524 and the other end of the pneumatic channel 528 is connected to the air chamber 513, the air pressure will increase. The air in the air chamber 513 can enter the conductor groove 524 through the air pressure channel 528. An air outlet is opened at the edge of the conductor groove 524 so that the air in the air pressure channel 528 can be discharged. So when the terminal groove 523 and the conductor block 526 are engaged in the docking point on the power tool, as the docking block 51 continues to slide, the moving terminal 52 will squeeze the air in the air chamber 513. In this way, the air in the air chamber 513 can enter the conductor groove 524 through the air pressure channel 528. During the air discharge process, on the one hand, the dust adhering to the conductor groove 524 and the conductor block 526 can be removed, and on the other hand, the dust adhering to the conductor at the docking point on the power tool can be removed, so that the conductor block 526 can make good contact with the docking point and ensure the stable current provided by the battery cell 3.

[0044] In one embodiment of the present invention, such as Figure 5 , Figure 6 and Figure 7As shown, a pressing slider 525 is located inside the moving block 521 near the hydraulic channel 527. A pressing end block 515 is fixedly connected inside the air chamber 513 near the pressing slider 525. One end of the conductor block 526 passes through the hydraulic channel 527 via a wire, then through the pressing slider 525, and then through the second housing 2 to connect with the control board 4. This ensures that the control board 4 can transmit the electrical energy from the battery cell 3 to the conductor block 526 via the wire. The conductor block 526 then transmits the electrical energy to the power tool. It should be noted that when the blocking block on the moving terminal 52 moves to the blocking groove 514, the moving terminal 52 can expel the air from the air chamber 513. At this time, the pressing end block 515 in the air chamber 513 will act on the pressing slider 525, causing the pressing slider 525 to move inside the moving block 521 and press the hydraulic channel 52. The hydraulic oil inside the 7th section is connected to the inner end of the conductor block 526 by the end of the hydraulic channel 527 away from the extrusion slider 525. This allows the hydraulic oil to act on the inner end of the conductor block 526, causing it to move outward within the conductor groove 524 and eventually press against the conductor on the power tool. Since the conductor block 526 extends beyond the conductor groove 524 and gets stuck between the conductor groove 524 and the connection point of the power tool, it also has an anti-detachment effect, further improving the stability of the power tool battery pack structure when connected to the power tool. Because the conductor block 526 is pressed against the conductor on the power tool by the hydraulic oil pressure, the connection between the conductor block 526 and the conductor on the power tool is very strong. Even if the power tool vibrates during operation, it will not affect the connection between the conductor block 526 and the conductor on the power tool.

[0045] It should be noted that a one-way valve 516 is installed on the top surface of the air chamber 513. The one-way valve 516 can ensure that external air enters the air chamber 513, while preventing the air in the air chamber 513 from being discharged into the external environment through the one-way valve 516.

[0046] In one embodiment of the invention, when the power tool battery pack structure needs to be removed from the power tool, such as Figure 7As shown, two sets of pneumatic springs 529 are installed on the side of the moving block 521 near the air chamber 513, while six sets of springs are installed inside the pressing slider 525. It should be noted that the spring force on the pressing slider 525 must be greater than the spring force on the moving block 521 from the pneumatic springs 529. This ensures that when the docking block 51 moves away from the power tool, the pressing slider 525 moves first, while the moving block 521 remains stationary. Consequently, when the pressing slider 525 moves first, the conductor block 526, under the influence of the hydraulic oil in the hydraulic channel 527, will move first towards the inside of the conductor groove 524, detaching from contact with the conductor on the power tool, thus aligning the power tool battery pack structure with... The power tool is powered off first, and this prevents the conductor block 526 from sliding and rubbing against the conductor, thus preventing wear. When the squeeze slider 525 moves to its maximum distance, that is, when the conductor block 526 is completely inside the conductor groove 524, the air spring 529 will act on the moving block 521, causing the moving block 521 to move away from the air chamber 513. During this process, the air chamber 513 will draw in air through the one-way valve 516 and the air pressure channel 528 to balance the air pressure inside the air chamber 513. When the moving block 521 moves to its maximum distance, the docking block 51 will also detach from the power tool, thus realizing the disassembly operation between the power tool battery pack structure and the power tool.

[0047] In one embodiment of the present invention, such as Figure 8 , Figure 9 and Figure 10 As shown, the locking mechanism 53 includes a moving button 531 and a spring-loaded locking tongue 532. The moving button 531 controls the position of the spring-loaded locking tongue 532 by displacement. It should be noted that the locking mechanism 53 is used to fix the power tool battery pack structure to the power tool. Therefore, a locking tongue groove that matches the spring-loaded locking tongue 532 needs to be opened at the corresponding position on the power tool. When the spring-loaded locking tongue 532 is locked in the locking tongue groove, the power tool battery pack structure can be fixed to the power tool.

[0048] A drive inclined block 533 is fixedly connected to the top surface of one inner end of the movable button 531. A button spring 534 is fixedly connected to the inner end face of the movable button 531. The elastic force of the button spring 534 is used to support the movable button 531, so that the movable button 531 can automatically reset. Locking tongue sliders 535 are fixedly connected to both sides of the bottom surface of the elastic locking tongue 532. The side wall of the locking tongue slider 535 near the drive inclined block 533 has a locking tongue groove 537 that matches the drive inclined block 533. A locking tongue spring 536 is fixedly connected to the center of the bottom surface of the elastic locking tongue 532. It should be noted that an internal groove 21 that matches the movable button 531 and the elastic locking tongue 532 is provided inside the second housing 2 at the positions corresponding to the movable button 531 and the elastic locking tongue 532. Figure 8For example, the movable button 531 can slide horizontally within the built-in groove 21, and the elastic locking tongue 532 can slide vertically within the built-in groove 21. When the elastic locking tongue 532 is embedded in the locking tongue groove on the power tool, the locking tongue spring 536 at the bottom of the elastic locking tongue 532 can exert elastic force on the bottom surface of the elastic locking tongue 532, making the elastic locking tongue 532 tightly locked in the locking tongue groove, ensuring that the power tool battery pack structure is fixed on the power tool. When it is necessary to disassemble the power tool battery pack structure, the movable button 531 can be pushed. The drive ramp 533 on the top surface of 31 engages with the latch groove 537 on the side wall of the latch slider 535. Therefore, when the moving button 531 is pushed, the drive ramp 533 enters into the latch groove 537 and drives the elastic latch 532 through the latch slider 535. This causes the elastic latch 532 to overcome the elastic force of the latch spring 536 and move downward, disengaging from the latch groove on the power tool. This releases the lock of the power tool battery pack structure, allowing the power tool battery pack structure to be removed from the power tool. The operation is simple and convenient.

[0049] In one embodiment of the present invention, the locking mechanism 53 is a control button and an electromagnetic latch. The control button controls the position of the electromagnetic latch through the circuit for opening and closing the electromagnetic latch. It should be noted that the electromagnetic latch circuit is powered by the battery cell 3, and the control button controls the opening and closing of the circuit. When the control button is moved, the electromagnetic latch circuit can be activated, causing the electromagnetic latch to disengage from the latch groove on the power tool. Then the power tool battery pack structure can be removed from the power tool.

[0050] In one embodiment of the present invention, such as Figure 11As shown, an oil bladder 5271 is provided inside the conductor block 526. The oil bladder 5271 is sealed to the hydraulic channel 527. The hydraulic channel 527 can also be replaced by an oil pipe, so the oil bladder 5271 is sealed to the oil pipe. The other end of the oil pipe is slidably connected to the extrusion slider 525. When the extrusion slider 525 moves, it can extrude the hydraulic oil in the oil pipe. The shape of the extrusion slider 525 and the specifications of the oil pipe can be adapted by those skilled in the art according to the size of the specific moving terminal 52. When the hydraulic oil in the hydraulic channel 527 is extruded, the oil bladder 5271 can expand, thereby pushing the conductor block 52. 6. Conversely, the oil bladder 5271 contracts, causing the conductor block 526 to retract. Since the conductor blocks 526 move synchronously, they can also be fixedly connected by a synchronizing rod 5261. Thus, when one conductor block 526 moves, the other conductor blocks 526 can move synchronously by driving the synchronizing rod 5261. The size and installation position of the synchronizing rod 5261 can be adaptively adjusted by those skilled in the art according to the shape of the conductor block 526 to ensure that the conductor block 526 is pressed against the conductor on the power tool under the pressure of the oil bladder 5271, ensuring good and stable contact between the conductor block 526 and the conductor on the power tool.

[0051] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A battery pack structure for power tools having multiple contact positive and negative terminals, characterized by, The utility model relates to a battery pack, including: The first shell (1) and the second shell (2) form the battery pack external structure; The battery core (3) is set in the inner chamber of the first shell (1) and the second shell (2) in several groups; The control panel (4) is set on the top surface of the battery core (3), and the control panel (4) is electrically connected with the battery core (3); The butt joint end (5) is set on the top surface of the second shell (2), and the butt joint end (5) is electrically connected with the control panel (4) through the second shell (2), and the butt joint end (5) is movable and non-frictionally electrically connected with the electric tool; The butt joint end (5) includes the butt joint block (51), one end of the butt joint block (51) is provided with the moving terminal (52), the inside of the butt joint block (51) is provided with the terminal sliding slot (512) close to the moving terminal (52), and the inside of the butt joint block (51) is provided with the air cavity (513); The terminal sliding slot (512) is provided with the blocking groove (514) close to the air cavity (513), and the middle position of the top surface of the moving terminal (52) is fixedly connected with the blocking block matched with the blocking groove (514); The moving terminal (52) includes the moving block (521), and one end of the moving block (521) is provided with a plurality of terminal blocks (522); One side of the terminal block (522) is provided with the conductor slot (524), and the inside of the conductor slot (524) is provided with the conductor block (526); The inside of the moving block (521) is provided with the hydraulic channel (527) and the air pressure channel (528), the hydraulic channel (527) is used for driving the conductor block (526), one end of the air pressure channel (528) is communicated with the conductor slot (524), and the other end of the air pressure channel (528) is communicated with the air cavity (513); The inside of the moving block (521) is provided with the extrusion sliding block (525) close to the hydraulic channel (527), and the inside of the air cavity (513) is fixedly connected with the extrusion end block (515) close to the extrusion sliding block (525); When the blocking block on the moving terminal (52) moves to the position of the blocking groove (514), the moving terminal (52) can exhaust the hollow air of the air cavity (513), at this time, the extrusion end block (515) in the air cavity (513) acts on the extrusion sliding block (525), so that the extrusion sliding block (525) moves in the inside of the moving block (521), extrudes the hydraulic oil in the hydraulic channel (527), makes the conductor block (526) move outward in the conductor slot (524), and finally extrudes the conductor on the electric tool, so that the movable non-friction electrical connection between the butt joint end (5) and the electric tool is realized.

2. The battery pack structure for power tools with multi-contact positive and negative terminals according to claim 1, characterized in that, The bottom surface of the butt joint block (51) is fixedly connected with the top surface of the second shell (2), and the other end of the butt joint block (51) is provided with the locking mechanism (53).

3. The battery pack structure for power tools with multi-contact positive and negative terminals according to claim 2, characterized in that, The two sides of the butt joint block (51) are provided with the limiting sliding slot (511).

4. The battery pack structure for power tools with multi-contact positive and negative terminals according to claim 3, wherein The terminal slots (523) are arranged between the terminal blocks (522).

5. The battery pack structure for power tools with multi-contact positive and negative terminals according to claim 2, wherein The locking mechanism (53) includes the moving button (531) and the elastic lock tongue (532), and the moving button (531) controls the position of the elastic lock tongue (532) through displacement.

6. The power tool battery pack structure with multi-contact positive and negative terminals according to claim 5, characterized in that, The top surface of one end of the inner side of the moving button (531) is fixedly connected with a driving inclined block (533), and the inner side end surface of the moving button (531) is fixedly connected with a button spring (534).

7. The battery pack structure for power tools with multi-contact positive and negative terminals according to claim 5, wherein The bottom surface of the elastic lock tongue (532) is fixedly connected with lock tongue sliding blocks (535), the side wall of the lock tongue sliding block (535) is provided with a lock tongue inclined groove (537) matched with the driving inclined block (533) at the position close to the driving inclined block (533), and the bottom surface center of the elastic lock tongue (532) is fixedly connected with a lock tongue spring (536).

8. The battery pack structure for power tools with multi-contact positive and negative terminals according to claim 6, wherein The locking mechanism (53) is a control button and an electromagnetic lock tongue, the position of the electromagnetic lock tongue is controlled by the circuit for opening and closing the electromagnetic lock tongue.

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