Downward-pressing tool for cylindrical battery busbar negative electrode welding

Abstract

The invention relates to the technical field of battery welding, in particular to a downward pressing tool for cylindrical battery busbar negative electrode welding. Comprising a welding platform; a battery holder is mounted on the upper surface of the welding platform; placing holes for placing batteries are uniformly formed in the battery holder; the upper surface of the welding platform is fixedly connected with a sliding rod; a pressing plate is connected to the sliding rod in a sliding manner; the outer wall of one sliding rod is sleeved with a reset spring. The lower surface of the pressing plate is connected with the upper surface of the welding platform through a reset spring. A square groove is formed in the center of the pressing plate in an up-down penetrating mode. The pressing blocks on the inner sides of the square grooves in the pressing plate are adjusted in the transverse direction and the longitudinal direction, so that the distance between every two adjacent pressing blocks is adjusted, the pressing tool can be suitable for welding of battery cathodes with different diameters, and the application range of the pressing tool is widened.

Description

Technical Field

[0001] The invention relates to the technical field of battery welding, in particular to a pressing tool for welding the negative electrode of a cylindrical battery busbar. Background Art

[0002] In the production process of power batteries, welding technology is one of the key steps in connecting battery components. The battery cell is the core component for storing energy, while the bus is an important component for connecting multiple cells and achieving energy output. In order to ensure that the battery pack can supply power efficiently and safely, the connection stability and conductivity between the cell and the bus must be guaranteed. Currently, the welding press-down tooling used for power batteries is mostly contoured copper nozzles, that is, a press-down tooling made of copper and other materials in a surrounding form consistent with the shape of the welding track is used to press the tab and the negative electrode of the cell.

[0003] This traditional pressing tool will have the following problems when facing densely stacked cylindrical battery packs with positive and negative poles on the same side and a small height difference: A. The distance between the positive and negative poles of the battery in the cylindrical battery pack is extremely small, and the copper material is easy to cause short circuit and fire of the positive and negative poles of the battery due to the deviation of the pressing position of the tool during operation, which poses a great safety hazard; B. The pressing position accuracy of the pressing tool is too high, which limits its use. It is impossible to use multiple sets of tools to press down at the same time, and the welding efficiency is low. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention proposes a pressing tool for welding the negative electrode of a cylindrical battery bus. The present invention adjusts the pressing blocks inside the square grooves on the pressing plate in the horizontal and vertical directions, thereby adjusting the spacing between adjacent pressing blocks. This makes the pressing tool suitable for welding negative electrodes of batteries with different diameters, thereby expanding the application range of the pressing tool. The present invention adopts high temperature resistant insulating materials to effectively avoid the short circuit risk of cylindrical battery bus welding, and realizes the synchronous pressing of multiple groups of battery buses, thereby greatly improving production efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the pressing tool for welding the negative pole of a cylindrical battery bus described in the present invention comprises a welding platform; a battery seat installed on the upper surface of the welding platform; the battery seat is evenly provided with placement holes for placing batteries; a sliding rod is fixedly connected to the upper surface of the welding platform; a pressing plate is slidably connected to the sliding rod; a reset spring is sleeved on the outer wall of one of the sliding rods; the lower surface of the pressing plate and the upper surface of the welding platform are connected by a reset spring; a square groove is provided through the center of the pressing plate from top to bottom; a plurality of pressing blocks are connected in the square groove; a plurality of the pressing blocks are located directly above the corresponding batteries; a spring ejector corresponding to the pressing point on the upper surface of the battery is fixedly connected to the lower surface of the pressing block; a welding groove corresponding to the welding area on the upper surface of the battery is provided through the upper and lower surfaces of the pressing block.

[0006] Preferably, the inner wall of the square groove is provided with a front slide groove penetrating forward; the inner wall of the square groove is provided with a left slide groove penetrating leftward; the front side of the pressure block is fixedly connected to the front slider; the rear side of the pressure block is provided with a rear groove corresponding to the front slider; the left side of the pressure block is fixedly connected to the left slider; the right side of the pressure block is provided with a right groove corresponding to the left slider; the left slider of the right side pressure block is slidably connected to the right groove of the adjacent left side pressure block; the front slider of the rear side pressure block is slidably connected to the rear groove of the adjacent front side pressure block; the front sliders on the front side are slidably connected in the front slide groove along the left and right directions, and the adjacent front sliders in the front slide groove are connected by a front spring; the front sliders on the front side are connected to the front slide groove along the left and right directions, and the front sliders on the front side are connected by the front spring. The multiple left sliders on the left side are connected in the left slide groove by sliding along the front-back direction, and the adjacent left sliders in the left slide groove are connected by the left spring; the return spring is close to the intersection of the front slide groove and the left slide groove; the corner position away from the return spring in the square groove is movably connected to the right-angle bar; one end of the right-angle bar moves in the front slide groove, and the other end moves in the left slide groove; an oblique groove is provided at the corner position away from the return spring in the square groove; the oblique bar is slidably connected in the oblique groove; the oblique bar is fixedly connected to the corner position of the right-angle bar; the welding groove is fan-shaped; there are multiple spring ejector pins on the lower surface of the pressure block.

[0007] Preferably, the cross-section of the inclined bar is in a "convex" shape; a threaded hole is provided on the upper surface of the inclined bar; a bolt is connected to the thread in the threaded hole; and the bolt can contact with the upper surface of the pressure plate to form friction after being screwed.

[0008] Preferably, the right side of the rightmost pressing block is fixedly connected to the right supporting block; the rear side of the rearmost pressing block is fixedly connected to the rear supporting block; right-angle grooves are provided on both sides of the inner side of the right-angle bar; the right supporting block and the rear supporting block are movably connected in the right-angle groove to form support.

[0009] Preferably, a driving groove is provided inside the inclined bar along the length direction; the driving groove is connected to a threaded hole at the top; the driving bar is connected to the driving groove by an upper and lower sliding seal; the lower surface of the driving bar and the lower groove wall of the driving groove are connected by a first spring; driven grooves are evenly provided on the two inner walls of the right-angle groove; the driven groove is connected to a locking block by a sliding seal; the bottom of the driven groove and the lower groove wall of the driving groove are connected by a first air hole.

[0010] Preferably, a pressing groove is provided on the lower surface of the pressing block near the two edges of the welding groove; the spring ejector includes a second spring and a pressing sheet; a plurality of pressing sheets are connected in an up and down sliding manner in the pressing groove; the upper end of the pressing sheet is connected to the bottom of the pressing groove through a second spring; and adjacent pressing sheets are in movable sealing contact.

[0011] Preferably, the adjacent pressing sheets are movably sealed and connected; the pressing sheets are slidably sealed and connected to the pressing grooves; and the vertical length of the pressing sheets is arranged to decrease as it approaches the two ends of the pressing grooves.

[0012] Preferably, the bottoms of two pressing grooves in the same pressing block are connected via a second air hole.

[0013] Preferably, the pressing block is made of a lightweight insulating material; the left slider is slidably matched with the corresponding right groove, and can be separated from each other under the influence of an external force; the front slider is slidably matched with the corresponding rear groove, and can be separated from each other under the influence of an external force.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention adjusts the pressing blocks inside the square grooves on the pressing plate in the horizontal and vertical directions, thereby adjusting the spacing between adjacent pressing blocks, so that the pressing tool can be suitable for welding negative electrodes of batteries with different diameters, thereby expanding the application scope of the pressing tool; the present invention adopts high-temperature resistant insulating materials to effectively avoid the short-circuit risk of cylindrical battery bus welding; and realizes the synchronous pressing of multiple groups of battery buses, thereby greatly improving production efficiency.

[0016] 2. In the present invention, the locking block in the driven groove is pushed out and enters into the right-angle groove under the action of air pressure. After the locking block extends out of the right-angle groove, it can block the sliding direction of the right support block and the rear support block, thereby locking the right support block and the rear support block. In this way, all the pressing blocks are locked to avoid displacement during the pressing process of the pressing blocks, thereby further improving the pressing accuracy and stability of the pressing tooling.

[0017] 3. In the present invention, the bottoms of the two pressing grooves in the pressing block pass through the second air holes, so that the air pressure in the two pressing grooves in the pressing block is kept consistent through the connection of the second air holes, so that the pressing force of the pressing sheets in the two pressing grooves on the two pressing points of the bar sheet tends to be consistent, thereby avoiding the situation where one point of the bar sheet has a greater force and causes it to tilt, thereby making the bar sheet fit more closely to the upper surface of the battery, thereby improving the subsequent negative electrode welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0019] Figure 1 is a stereogram of the present invention;

[0020] Figure 2 yes Figure 1 A three-dimensional image from another angle;

[0021] Figure 3 is a cross-sectional view of the pressure plate of the present invention;

[0022] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5It is a schematic diagram of connecting multiple pressing blocks in the present invention;

[0024] Figure 6 is a three-dimensional diagram of a single pressing block in the present invention;

[0025] Figure 7 is a cross-sectional view of a single pressing block in the present invention;

[0026] Figure 8 is a three-dimensional diagram of the right-angle bar in the present invention;

[0027] Fig. 9 It is a cross-sectional view of the oblique strip in the present invention.

[0028] In the figure: welding platform 1, slide bar 11, return spring 12, battery holder 2, placement hole 21, pressure plate 3, square groove 31, front slide groove 32, left slide groove 33, front spring 34, left spring 35, oblique groove 36, pressure block 4, welding groove 41, front slider 42, rear groove 43, left slider 44, right groove 45, right support block 46, rear support block 47, pressure groove 48, second air hole 49, spring ejector pin 5, second spring 51, pressure sheet 52, right angle bar 6, right angle groove 61, driven groove 62, locking block 63, first air hole 64, oblique bar 7, threaded hole 71, bolt 72, drive groove 73, drive bar 74, first spring 75. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0030] like Figures 1 to 9 As shown, the present invention includes the following embodiments:

[0031] Embodiment 1: A pressing tool for welding the negative pole of a cylindrical battery bus, comprising a welding platform 1; a battery holder 2 mounted on the upper surface of the welding platform 1; the battery holder 2 is evenly provided with placement holes 21 for placing batteries; a slide bar 11 is fixedly connected to the upper surface of the welding platform 1; a pressure plate 3 is slidably connected to the slide bar 11; a return spring 12 is sleeved on the outer wall of one of the slide bars 11; the lower surface of the pressure plate 3 is connected to the upper surface of the welding platform 1 through the return spring 12; a square groove 31 is provided through the center of the pressure plate 3 from top to bottom; a plurality of pressure blocks 4 are connected in the square groove 31; a plurality of the pressure blocks 4 are located directly above the corresponding batteries; a spring ejector 5 corresponding to the pressing point on the upper surface of the battery is fixedly connected to the lower surface of the pressure block 4; a welding groove 41 corresponding to the welding area on the upper surface of the battery is provided through the upper and lower surfaces of the pressure block 4.

[0032] In this embodiment, the inner wall of the square groove 31 is provided with a front slide groove 32 extending forward; the inner wall of the square groove 31 is provided with a left slide groove 33 extending leftward; the front side of the pressure block 4 is fixedly connected to the front slider 42; the rear side of the pressure block 4 is provided with a rear groove 43 corresponding to the front slider 42; the left side of the pressure block 4 is fixedly connected to the left slider 44; the right side of the pressure block 4 is provided with a right groove 45 corresponding to the left slider 44; the left slider 44 of the right pressure block 4 is slidably connected to the right groove 45 of the adjacent left pressure block 4; the front slider 42 of the rear pressure block 4 is slidably connected to the rear groove 43 of the adjacent front pressure block 4; the front multiple front sliders 42 on the front side are slidably connected in the front slide groove 32 along the left and right directions, and the adjacent front sliders 42 in the front slide groove 32 are connected by the front spring 34 The left sliders 44 on the far left are connected in a sliding manner in the front-rear direction in the left slide groove 33, and the adjacent left sliders 44 in the left slide groove 33 are connected by a left spring 35; the return spring 12 is close to the intersection of the front slide groove 32 and the left slide groove 33; the right-angle bar 6 is movably connected to the corner position away from the return spring 12 in the square groove 31; one end of the right-angle bar 6 moves in the front slide groove 32, and the other end moves in the left slide groove 33; an inclined groove 36 is provided at the corner position away from the return spring 12 in the square groove 31; the inclined bar 7 is slidably connected in the inclined groove 36; the inclined bar 7 is fixedly connected to the corner position of the right-angle bar 6; the welding groove 41 is fan-shaped; there are multiple spring ejector pins 5 on the lower surface of the pressing block 4.

[0033] In this embodiment, the cross section of the inclined bar 7 is a "convex" shape; a threaded hole 71 is provided on the upper surface of the inclined bar 7; the threaded hole 71 is internally threaded with a bolt 72; after the bolt 72 is screwed, it can contact the upper surface of the pressure plate 3 to form friction.

[0034] This case is mainly for the welding of the negative pole of the cylindrical battery bus corresponding in the vertical and horizontal directions. Before welding, the battery holder 2 with the battery installed needs to be placed on the upper surface of the welding platform 1, and the battery holder 2 will be moved to the top of the pressure plate 3. The placement hole 21 at one corner of the battery holder 2 is located directly below the pressure block 4 at the intersection of the front slide groove 32 and the left slide groove 33. Then the position of the battery holder 2 is fixed, and then the staff will reversely screw the bolt 72. After the bolt 72 is reversely screwed, it will be out of contact with the upper surface of the pressure plate 3 to unlock the inclined bar 7. Then the inclined bar 7 is moved to slide along the inclined groove 36. In the process of the inclined bar 7 approaching the reset spring 12, the inclined bar 7 will drive the right-angle bar 6 to push multiple pressure blocks 4 toward the reset spring 12. The spacing between the pressure blocks 4 in the front and rear directions will be reduced and close to each other, and the rear groove 43 of the front pressure block 4 will be close to the front pressure block 4. By sliding with the front slider 42 of the adjacent rear pressing block 4, the spacing between the pressing blocks 4 in the left and right directions will be reduced and close to each other, and the right groove 45 of the left pressing block 4 will slide with the left slider 44 of the adjacent right pressing block 4. For batteries with smaller diameters, the spacing between adjacent batteries will also become smaller. Therefore, by controlling all the pressing blocks 4 to converge toward the return spring 12, the spacing between adjacent pressing blocks 4 is reduced. The front slider 42 in the front slide groove 32 overcomes the front spring 34 and converges toward the left side, and the left slider 44 in the left slide groove 33 overcomes the left spring 35 and converges toward the front side, so that all the pressing blocks 4 can converge toward the return spring 12 at an equal distance, and the welding groove 41 and the spring ejector pin 5 on the pressing block 4 will change with the change of the position of the pressing block 4, so that all the pressing blocks 4 can move to the top of the corresponding battery;When the diameter of the battery is large, the inclined bar 7 is moved along the inclined slot 36 away from the return spring 12, and the inclined bar 7 drives the right-angled bar 6 to move inside the square slot 31 away from the return spring 12. The front end of the right-angled bar 6 is movably connected to the front slide slot 32, and the left end of the right-angled bar 6 is movably connected to the left slide slot 33. When the right-angled bar 6 is away from the return spring 12, the limit and restraint of the pressure block 4 are released, and the front spring 34 in the front slide slot 32 transmits the elastic force to the front slider 42 in the front slide slot 32, so that the front slider 42 in the front slide slot 32 is expanded toward the right direction. During the expansion of the front slider 42 in the front slide groove 32, the pressure block 4 in the square groove 31 will be driven to expand toward the right direction, and the left spring 35 in the left slide groove 33 will transmit the elastic force to the left slider 44 in the left slide groove 33, so that the left slider 44 in the left slide groove 33 will expand toward the rear direction. During the expansion of the left slider 44 in the left slide groove 33, the pressure block 4 in the square groove 31 will be driven to expand toward the rear direction, so that the multiple pressure blocks 4 in the square groove 31 are expanded away from the return spring 12, and the spacing between adjacent pressure blocks 4 changes accordingly. The welding groove 41 on the pressure block 4 and the spring ejector pin 5 As the position of the pressing block 4 changes, the pressing block 4 moves to the top of the corresponding battery. After the position adjustment of the pressing block 4 is completed, the bolt 72 is screwed forward to rotate the bolt 72 in the threaded hole 71. After being screwed, the bolt 72 will abut against the upper surface of the pressing plate 3. The friction between the bolt 72 and the upper surface of the pressing plate 3 is used to lock the position of the inclined strip 7 in the inclined groove 36, so that the position of the pressing block 4 in the square groove 31 is locked. In this way, the position of the pressing block 4 will not change during the pressing process, ensuring that the spring ejector pin 5 on the pressing block 4 and the welding groove 41 are aligned with the upper surface of the corresponding battery. After the position adjustment of the pressing block 4 is completed, the bar on the bus is placed, and the pressing plate 3 is controlled to move downward. The number of pressing blocks 4 can be much larger than the number of batteries. The figure only shows a small number of batteries and pressing blocks 4. The specific number is set according to the actual welding requirements; the number of pressing blocks 4 in the horizontal and vertical directions in the square groove 31 is set according to the requirements, and the inclined groove 36 is set in the direction toward the intersection of the left slide groove 33 and the front slide groove 32; the position of the welding groove 41 on the pressing block 4 and the position of the spring ejector 5 are set in the direction according to the welding requirements, and the welding groove 41 is fan-shaped, so as to meet the welding requirements of batteries with different diameters;During the downward movement of the pressure plate 3, the pressure plate 3 will overcome the elastic force of the return spring 12 and move downward along the axial direction of the slide rod 11. During the downward movement of the pressure plate 3, multiple pressure blocks 4 will be driven to move downward synchronously. During the downward movement of the pressure blocks 4, the spring ejector pins 5 will be driven to move downward. During the downward movement of the spring ejector pins 5, the spring ejector pins 5 will contact the tabs on the upper surface of the battery, thereby pressing the tabs on the upper surface of the battery. Subsequently, while keeping the pressure plate 3 in the downward movement state, the welding equipment is controlled to perform welding through the welding slot 41, thereby welding the tabs to the upper surface of the battery together. The welding is completed. After completion, release the pressing plate 3 and move it upward. The reset spring 12 will push the pressing plate 3 upward. During the upward movement of the pressing plate 3, multiple pressing blocks 4 and the spring ejector pins 5 on the lower surface of the pressing blocks 4 will move upward. The battery after the whole plate is welded is removed, and the next whole plate battery is placed. The battery can be placed and removed as a whole plate to improve the welding efficiency. After the whole battery plate is placed, the battery at one of the corners on the battery holder 2 is located directly under the pressing block 4 close to the reset spring 12 to meet the adjustment requirements of the pressing block 4 under the subsequent welding of batteries of different specifications;

[0035] The present invention adjusts the pressing blocks 4 inside the square grooves 31 on the pressing plate 3 in the horizontal and vertical directions, thereby adjusting the spacing between adjacent pressing blocks 4, so that the pressing tool can be suitable for welding negative electrodes of batteries with different diameters, thereby expanding the application range of the pressing tool; the present invention adopts high-temperature resistant insulating materials to effectively avoid the short-circuit risk of cylindrical battery bus welding; and realizes the synchronous pressing of multiple groups of battery buses, which greatly improves production efficiency.

[0036] Embodiment 2: The right side of the rightmost pressing block 4 is fixedly connected to the right support block 46; the rear side of the rearmost pressing block 4 is fixedly connected to the rear support block 47; the inner sides of the right-angle bar 6 are connected to each other with right-angle grooves 61; the right support block 46 and the rear support block 47 are movably connected in the right-angle groove 61 to form support.

[0037] In this embodiment, a driving groove 73 is provided inside the inclined bar 7 along the length direction; the driving groove 73 is connected to the threaded hole 71 at the top; the driving bar 74 is connected to the driving groove 73 by sliding and sealing up and down; the lower surface of the driving bar 74 is connected to the lower groove wall of the driving groove 73 by a first spring 75; the two inner walls of the right-angle groove 61 are evenly provided with driven grooves 62; the driven groove 62 is connected to the locking block 63 by sliding and sealing; the spacing between adjacent locking blocks 63 is smaller than the specifications of the right support block 46 and the rear support block 47; the bottom of the driven groove 62 and the lower groove wall of the driving groove 73 are connected by the first air hole 64.

[0038] When the locking cam 75 is in the state of being moved upward, the locking cam 75 will be in the state of being moved downward, and the locking cam 75 will be in the state of being moved downward, so that the locking cam 75 can be turned back to the original position, and the locking cam 75 will be in the state of being moved downward, so that the locking cam 75 can be turned back to the original position, and the locking cam 75 will be in the state of being moved downward, and the locking cam 75 will be in the state of being moved downward, and the The lower part is retracted along the driven groove 62 into the driven groove 62, so that after the locking block 63 moves out of the right-angle groove 61, the right support block 46 and the rear support block 47 in the right-angle groove 61 are unlocked, and the upward movement of the bolt 72 will also unlock the inclined bar 7, and then the inclined bar 7 is controlled to drive the right-angle bar 6 to move, and the distance between adjacent pressing blocks 4 will also be changed. After the spacing between multiple pressing blocks 4 is adapted to the spacing between adjacent batteries, multiple pressing blocks 4 will be located directly above the corresponding batteries. During the movement of the pressing blocks 4, the right support block 46 and the rear support block 47 will move in the right-angle groove 61. After the pressing is completed After the position of block 4 is adjusted, screw the bolt 72 forward. The bolt 72 will move downward after being screwed. During the downward movement of the bolt 72, the driving bar 74 will be squeezed to move downward in the driving groove 73. The gas in the driving groove 73 space below the driving bar 74 is pressurized and the air pressure increases. The gas in the driving groove 73 below the driving bar 74 will enter the driven groove 62 along the first air hole 64. The locking block 63 in the driven groove 62 is pushed out and enters the right-angle groove 61 under the action of air pressure. After the locking block 63 extends out of the right-angle groove 61, it can block the sliding direction of the right support block 46 and the rear support block 47. , thereby locking the right support block 46 and the rear support block 47, so that all the pressing blocks 4 are locked, avoiding displacement during the pressing process of the pressing block 4, and further improving the pressing accuracy and stability of the pressing tooling; in the process of the pressing block 4 driving the spring ejector 5 to press down, the right support block 46 and the rear support block 47 play the role of supporting the pressing block 4, improving the strength of the pressing block 4, and reducing the probability of deformation of the left slider 44 and the front slider 42 on the pressing block 4 due to the reaction force of the spring ejector 5, so that the stability of the pressing tooling is improved.

[0039] Embodiment 3: The lower surface of the pressing block 4 is provided with pressing grooves 48 at the two edge positions near the welding groove 41; the spring ejector 5 includes a second spring 51 and a pressing sheet 52; a plurality of pressing sheets 52 are connected in an upward and downward sliding manner in the pressing groove 48; the upper end of the pressing sheet 52 is connected to the bottom of the pressing groove 48 by a second spring 51; adjacent pressing sheets 52 are in movable sealing contact.

[0040] In this embodiment, the adjacent pressing plates 52 are movably sealed and connected; the pressing plates 52 are slidably sealed and connected to the pressing grooves 48 ; and the vertical length of the pressing plates 52 is reduced as it approaches the two ends of the pressing grooves 48 .

[0041] In this embodiment, the bottoms of two pressing grooves 48 in the same pressing block 4 are connected via a second air hole 49 .

[0042] As the pressure plate 3 drives the pressure block 4 to move downward, the pressure block 4 will drive the welding groove 41 and the pressure piece 52 on the lower surface to move downward synchronously. The shape of the bar is approximately Y-shaped, and the pressing point is located at the end position of the Y-shaped bar. As the pressure block 4 moves downward, the pressure block 4 will drive the pressure piece 52 to contact the upper end surface of the battery and the bar. Since the length of the pressure piece 52 in the vertical direction decreases as it approaches the two ends of the pressure groove 48, it can be understood that the lower surfaces of multiple pressure pieces 52 are combined to form an upwardly concave arch, so that the pressure pieces 52 near the two ends of the pressure groove 48 can first cross the bar and press against the upper surface of the battery, thereby restricting the pressure piece 52 between the pressure pieces 52 near the end surface of the pressure groove 48, thereby achieving the effect of limiting the pressure piece 52. As the pressure block 4 continues to move downward, the pressure piece 52 near the middle position in the pressure groove 48 will move downward in turn and press against the bar. As the pressure block 4 continues to move downward, the pressure piece 52 will squeeze the gas in the pressure groove 48, and the gas in the pressure groove 48 will be pressurized to react the air pressure The pressing sheet 52 is given, so that the pressing sheet 52 further presses the bar sheet. There are generally two pressing points on the battery, and there are two pressing grooves 48 on the lower surface of the pressing block 4. Since the bottoms of the two pressing grooves 48 in the pressing block 4 pass through the second air hole 49, the second air hole 49 is connected, so that the air pressure in the two pressing grooves 48 in the pressing block 4 remains consistent, so that the pressing force of the pressing sheets 52 in the two pressing grooves 48 on the two pressing points of the bar sheet tends to be consistent, thereby avoiding the situation where one point of the bar sheet has a greater force and causes it to tilt, thereby making the bar sheet fit more closely to the upper surface of the battery and improving the subsequent negative electrode welding effect; the multiple pressing sheets 52 in each pressing groove 48 can expand the pressing range of the bar sheet, so that it can be suitable for pressing the bar sheets on batteries of different specifications; in this embodiment, in order to improve the air pressure transmission effect of the two pressing grooves 48 through the second air hole 49, compressed gas can be pre-filled to ensure the force transmission effect.

[0043] Embodiment 4: The pressing block 4 is made of a lightweight insulating material; the left slider 44 is slidably matched with the corresponding right groove 45 and can be separated from each other under external force; the front slider 42 is slidably matched with the corresponding rear groove 43 and can be separated from each other under external force.

[0044] Since the pressing block 4 itself is made of lightweight insulating material, even when there are a large number of pressing blocks 4, the connection strength of adjacent pressing blocks 4 can be ensured by setting the front slider 42 and the rear slider. When the pressing block 4 needs to be replaced, it is only necessary to push away the pressing blocks 4 around the replaced pressing block 4, so that the left slider 44 is disengaged from the right groove 45, and the front slider 42 is disengaged from the rear groove 43. After the left slider 44 is plugged into the corresponding right side, and the front slider 42 is plugged into the corresponding rear groove 43, the replacement of the pressing block 4 is completed, and the pressing block 4 is replaced together with the pressing sheet 52 on the lower surface. The attached drawings in this case are schematic diagrams, not the actual number of pressing blocks 4 in the production process.

[0045] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pressing tool for welding the negative electrode of a cylindrical battery busbar, comprising a welding platform (1); a battery holder (2) mounted on the upper surface of the welding platform (1); and placement holes (21) for placing batteries are evenly arranged on the battery holder (2); characterized in that: The upper surface of the welding platform (1) is fixedly connected to a slide bar (11); the slide bar (11) is slidably connected to a pressure plate (3); a return spring (12) is sleeved on the outer wall of one of the slide bars (11); the lower surface of the pressure plate (3) is connected to the upper surface of the welding platform (1) via the return spring (12); a square groove (31) is provided through the center of the pressure plate (3) from top to bottom; a plurality of pressure blocks (4) are connected in the square groove (31); the plurality of pressure blocks (4) are located directly above the corresponding batteries; the lower surface of the pressure block (4) is fixedly connected to a spring ejector pin (5) corresponding to a pressing point on the upper surface of the battery; the pressure block (4) is provided with a welding groove (41) corresponding to a welding area on the upper surface of the battery from top to bottom.

2. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 1, characterized in that: The inner wall of the square groove (31) is provided with a front slide groove (32) penetrating forward; the inner wall of the square groove (31) is provided with a left slide groove (33) penetrating leftward; the front side of the pressure block (4) is fixedly connected to the front slider (42); the rear side of the pressure block (4) is provided with a rear groove (43) corresponding to the front slider (42); the left side of the pressure block (4) is fixedly connected to the left slider (44); the right side of the pressure block (4) is provided with a right groove (45) corresponding to the left slider (44); the left slider (44) of the right side pressure block (4) is slidably connected to the right groove (45) of the adjacent left side pressure block (4); the front slider (42) of the rear side pressure block (4) is slidably connected to the rear groove (43) of the adjacent front side pressure block (4); the front most front sliders (42) are slidably connected in the front slide groove (32) along the left-right direction, and the adjacent front sliders (42) in the front slide groove (32) are connected by the front spring (34). The left sliders (44) on the far left are connected in a sliding manner in the front-rear direction in the left slide groove (33), and the adjacent left sliders (44) in the left slide groove (33) are connected by a left spring (35); the return spring (12) is close to the intersection of the front slide groove (32) and the left slide groove (33); the right-angle bar (6) is movably connected to the corner position away from the return spring (12) in the square groove (31); one end of the right-angle bar (6) is movable in the front slide groove (32), and the other end is movable in the left slide groove (33); an inclined groove (36) is provided in the corner position away from the return spring (12) in the square groove (31); the inclined groove (36) is slidably connected to the inclined bar (7); the inclined bar (7) is fixedly connected to the corner position of the right-angle bar (6); the welding groove (41) is fan-shaped; the number of spring ejector pins (5) on the lower surface of the pressing block (4) is multiple.

3. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 2, characterized in that: The cross section of the inclined strip (7) is in the shape of a "convex" character; a threaded hole (71) is provided on the upper surface of the inclined strip (7); the threaded hole (71) is internally threadedly connected to a bolt (72); and the bolt (72) can contact the upper surface of the pressure plate (3) to form friction after being screwed.

4. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 3, characterized in that: The right side of the rightmost pressing block (4) is fixedly connected to the right supporting block (46); the rear side of the rearmost pressing block (4) is fixedly connected to the rear supporting block (47); the inner sides of the right-angle bar (6) are connected to each other and are provided with right-angle grooves (61); the right supporting block (46) and the rear supporting block (47) are movably connected in the right-angle grooves (61) to form support.

5. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 4, characterized in that: A driving groove (73) is arranged inside the inclined strip (7) along the length direction; the driving groove (73) is connected to the threaded hole (71) at the top; the driving strip (74) is connected to the driving strip (74) in an upward and downward sliding seal; the lower surface of the driving strip (74) is connected to the lower groove wall of the driving groove (73) through a first spring (75); driven grooves (62) are evenly arranged on the two inner walls of the right-angle groove (61); the driven groove (62) is connected to the locking block (63) in a sliding seal; the bottom of the driven groove (62) and the lower groove wall of the driving groove (73) are connected through a first air hole (64).

6. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 1, characterized in that: The lower surface of the pressing block (4) is provided with pressing grooves (48) near the two edge positions of the welding groove (41); the spring ejector pin (5) comprises a second spring (51) and a pressing sheet (52); a plurality of pressing sheets (52) are connected in an upward and downward sliding manner in the pressing groove (48); the upper end of the pressing sheet (52) is connected to the bottom of the pressing groove (48) via the second spring (51); and adjacent pressing sheets (52) are in movable sealing contact.

7. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 6, characterized in that: The adjacent pressing plates (52) are movably sealed and connected; the pressing plates (52) are slidably sealed and connected to the pressing grooves (48); and the vertical length of the pressing plates (52) is reduced as it approaches the two ends of the pressing grooves (48).

8. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 7, characterized in that: The bottoms of the two pressing grooves (48) in the same pressing block (4) are connected via a second air hole (49).

9. The pressing tool for welding the negative electrode of a cylindrical battery busbar according to claim 2, characterized in that: The pressing block (4) is made of a light insulating material; the left sliding block (44) is slidably matched with the corresponding right groove (45) and can be separated from each other under the influence of an external force; the front sliding block (42) is slidably matched with the corresponding rear groove (43) and can be separated from each other under the influence of an external force.

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