Tab leveling device

Abstract

The utility model discloses a tab leveling device, and relates to the technical field of battery production and manufacturing. The tab flattening device comprises a roll core fixing mechanism and at least one tab flattening mechanism, the roll core fixing mechanism is provided with at least one operation hole, and the operation hole is used for allowing the end face of the battery roll core to be exposed; the tab leveling mechanism comprises a leveling assembly, a force feedback assembly, a bracket and a driving assembly; the leveling assembly and the force feedback assembly are both installed on the support, the leveling assembly is arranged facing the operation hole, and the force feedback assembly is used for obtaining the counter-acting force, from the battery roll core, borne by the leveling assembly; the support is connected with the driving assembly and can be driven by the driving assembly to drive the leveling assembly to reciprocate in the set direction, and the set direction is parallel to the axial direction of the operation hole. According to the tab flattening device disclosed by the invention, the end surface forming effect of the battery roll core can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery production and manufacturing, and particularly relates to a tab flattening device. BACKGROUND

[0002] In the process of battery production and manufacturing, a plurality of tabs at both ends of a battery roll core need to be welded to a busbar. Before welding, the tabs need to be pre-pressed and bent multiple times so that all the tabs at both ends of the roll core are flattened.

[0003] In the related art, a tab flattening device generally uses a driving mechanism to drive multiple pairs of flattening dies to continuously extrude the tabs at both ends of the roll core with a single force, so that the tabs are bent towards the middle of the roll core and are attached flat on the end face of the roll core. However, since the tabs are very thin and the pre-bending accuracy of the incoming tabs is not high, when the tabs are flattened by the above device, some tabs may be over-pressed and some tabs may not be completely pressed into place, that is, the total height of the tab forming is fluctuating, and therefore the forming accuracy of the end face of the roll core is not high, which may easily cause assembly defects in subsequent processes. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the application provides a tab flattening device which can improve the end face forming effect of a battery roll core.

[0005] The application specifically adopts the following technical solutions:

[0006] The application provides a tab flattening device, which comprises a roll core fixing mechanism and at least one tab flattening mechanism.

[0007] The roll core fixing mechanism has at least one operation hole for allowing the end face of the battery roll core to protrude therefrom.

[0008] The tab flattening mechanism comprises a flattening assembly, a force feedback assembly, a bracket and a driving assembly.

[0009] The flattening assembly and the force feedback assembly are both mounted on the bracket, wherein the flattening assembly is arranged to face the operation hole, and the force feedback assembly is used to obtain the reaction force of the battery roll core acting on the flattening assembly.

[0010] The bracket is connected with the driving assembly and can be driven by the driving assembly to drive the flattening assembly to reciprocate in a set direction, and the set direction is parallel to the axial direction of the operation hole.

[0011] Optionally, the bracket comprises a first fixing seat and a second fixing seat, and the first fixing seat and the second fixing seat are arranged in a spaced manner to form a matching space therebetween.

[0012] The flattening assembly is movably installed on the first fixing base, and a part of the flattening assembly is movable in the matching space;

[0013] The force feedback assembly is installed on the second fixing base, and the force feedback assembly is connected with the part of the flattening assembly located in the matching space.

[0014] Optionally, the force feedback assembly comprises a force transmission member and a pressure detection member;

[0015] One end of the force transmission member is connected with the flattening assembly, and the other end of the force transmission member is in pressure fit with the pressure detection member;

[0016] The pressure detection member is connected with the second fixing base, and the pressure detection member is used for collecting the pressure applied by the force transmission member.

[0017] Optionally, the second fixing base comprises a mounting sleeve, and the mounting sleeve has opposite open ends and a closed end in the set direction;

[0018] The pressure detection member is located in the interior of the mounting sleeve and connected with the closed end;

[0019] The force transmission member comprises a top block and a compression spring, the top block is located in the interior of the mounting sleeve and abuts against the pressure detection member, the compression spring is located on the side of the top block away from the pressure detection member, one end of the compression spring extends into the interior of the mounting sleeve and elastically connects with or abuts against the top block, and the other end of the compression spring is located outside the mounting sleeve and elastically connects with or abuts against the flattening assembly.

[0020] Optionally, the top block comprises a limiting portion and a first shaft portion, a circumferential side wall of the limiting portion is in contact fit with an inner side wall of the mounting sleeve, and the first shaft portion is connected with the surface of the limiting portion close to the open end;

[0021] The compression spring is sleeved on the outside of the first shaft portion and abuts against the limiting portion.

[0022] Optionally, the mounting sleeve comprises a sleeve body and an adjusting end cover, the sleeve body is open at opposite ends in the set direction, and the adjusting end cover blocks one end of the sleeve body, thereby constituting the closed end of the mounting sleeve;

[0023] At least a part of the adjusting end cover is movable relative to the sleeve body in the set direction, and the pressure detection member is connected with the adjusting end cover.

[0024] Optionally, a strip-shaped notch extending in the set direction is arranged on the sleeve body;

[0025] The pressure detection member comprises a pressure sensing part and an electricity connecting part, the pressure sensing part is connected with the adjusting end cover, one end of the electricity connecting part is electrically connected with the pressure sensing part, and the other end of the electricity connecting part passes through the strip-shaped gap.

[0026] Optionally, the second fixing base further comprises a first mounting member, the first mounting member is connected to the open end of the mounting sleeve, and a through hole in communication with the open end of the mounting sleeve is arranged on the first mounting member, and the matching space is formed between the first mounting member and the first fixing base.

[0027] The bracket further comprises a bottom plate, and the first fixing base and the first mounting member are both connected to the bottom plate; and / or the bracket further comprises at least one connecting rod, and the first mounting member is connected to the first fixing base through the connecting rod.

[0028] Optionally, an axle hole is arranged through the first fixing base along the set direction;

[0029] The flattening assembly comprises a flattening die, a second mounting member and a guide rod, the flattening die is located between the winding core fixing mechanism and the first fixing base, the second mounting member is located in the matching space and is matched and connected with the force feedback assembly, the guide rod passes through the axle hole and is movable in the axle hole, and two ends of the guide rod are connected with the flattening die and the second mounting member respectively.

[0030] Optionally, the device further comprises a control member, and the control member is signal connected with the force feedback assembly and the driving assembly.

[0031] Optionally, the tab flattening mechanism further comprises a displacement detection member, the displacement detection member is used for acquiring the driving movement amount of the driving assembly to the bracket, and the displacement detection member is signal connected with the control member.

[0032] In the tab flattening device provided by the embodiment, after the battery winding core is fixed on the winding core fixing mechanism and the end face of the battery winding core is exposed from the operation hole of the winding core fixing mechanism, the driving assembly in the tab flattening mechanism is used to drive the bracket to move towards the operation hole, so that the flattening assembly is driven to act on the end face of the battery winding core. With the flattening assembly gradually moving forward under the driving of the bracket, the tabs extending from the end face of the battery winding core are pressed, so as to be attached to the end face of the winding core, and the flattening effect is achieved. In this process, the force feedback assembly continuously collects the reaction force of the flattening assembly from the battery winding core, and when the reaction force exceeds the first set threshold, the driving assembly stops, so as to ensure that the tabs can be flattened in place, and the tabs are prevented from being damaged due to overpressure, thereby improving the forming precision of the end face of the winding core and improving the end face forming effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] Figure 1 is a structural schematic diagram of an ear flattening device provided by an embodiment of the present application;

[0035] Figure 2 is an exploded view of an ear flattening mechanism provided by an embodiment of the present application;

[0036] Figure 3 is an exploded view of a support provided by an embodiment of the present application;

[0037] Figure 4 is a cross-sectional structural schematic diagram of an ear flattening mechanism provided by an embodiment of the present application;

[0038] Figure 5 is a control relationship schematic diagram of a control device provided by an embodiment of the present application;

[0039] Figure 6 is an assembly schematic diagram of a winding core fixing structure provided by an embodiment of the present application.

[0040] Reference signs:

[0041] 100, winding core fixing mechanism; 101, operation hole; 102, base; 1021, first groove; 103, pressing piece; 1031, second groove;

[0042] 200, ear flattening mechanism;

[0043] 1, flattening assembly; 11, flattening die; 111, flattening groove; 12, second mounting piece; 121, second shaft part; 13, guide rod;

[0044] 2, force feedback assembly; 21, force transmission piece; 211, top block; 2111, limiting part; 2112, first shaft part; 212, compression spring; 22, pressure detection piece; 221, pressure sensing part; 2211, second fixing part; 222, electricity connection part;

[0045] 3. Bracket; 31. First fixed seat; 311. Shaft hole; 32. Second fixed seat; 321. Mounting sleeve; 3211. Open end; 3212. Closed end; 3213. Sleeve body; 32131. Strip notch; 3214. Adjusting end cover; 32141. Cover plate; 32142. Adjusting knob; 32143. First fixed part; 322. First mounting part; 3221. Through hole; 33. Mating space; 34. Base plate; 35. Connecting rod;

[0046] 4. Drive components; 41. Track components; 42. Moving components; 43. Power components;

[0047] 5. Control devices;

[0048] 6. Displacement detection components. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0051] This application provides a tab flattening device, which is generally used in battery manufacturing. For example... Figure 1 As shown, the tab flattening device includes a core fixing mechanism 100 and at least one tab flattening mechanism 200. The core fixing mechanism 100 has at least one operating hole 101, which allows the end face of the battery core to be exposed therethrough. The tab flattening mechanism 200 includes a flattening component 1, a force feedback component 2, a bracket 3, and a drive component 4. The flattening component 1 and the force feedback component 2 are both mounted on the bracket 3, wherein the flattening component 1 faces the operating hole 101, and the force feedback component 2 is used to obtain the reaction force from the battery core received by the flattening component 1. The bracket 3 is connected to the drive component 4 and can be driven by the drive component 4 to drive the flattening component 1 to reciprocate in a set direction, which is parallel to the axial direction of the operating hole 101.

[0052] The tab flattening device provided by the embodiment of the application includes a winding core fixing mechanism 100 for fixing the battery winding core and a tab flattening mechanism 200 for flattening the tabs on the end surface of the battery winding core. Generally, the two end surfaces of the battery winding core respectively extend with positive and negative tabs, and the positive and negative tabs can be flattened in sequence or simultaneously in the tab flattening process.

[0053] To make the technical solutions and advantages of the application clearer, the following will combine the accompanying drawings to further describe the technical solutions and advantages of the application. Figures 1-6 The tab flattening device provided by the embodiment of the application will be further introduced and described.

[0054] The tab flattening device provided by the embodiment of the application includes a winding core fixing mechanism 100 for fixing the battery winding core and a tab flattening mechanism 200 for flattening the tabs on the end surface of the battery winding core. Generally, the two end surfaces of the battery winding core respectively extend with positive and negative tabs, and the positive and negative tabs can be flattened in sequence or simultaneously in the tab flattening process.

[0055] In one example, the winding core fixing mechanism 100 in the tab flattening device has one operation hole 101, and the number of the tab flattening mechanism 200 is also one. In this case, the positive and negative tabs can be flattened in sequence, and the exemplary process is as follows: first, fix the battery winding core to the winding core fixing mechanism 100 so that one end surface of the battery winding core and the positive tab on the end surface are exposed from the operation hole 101, then operate the tab flattening mechanism 200 to flatten the positive tab; after the positive tab is flattened, take out the battery winding core, rotate the winding core in the axial direction, then fix the battery winding core to the winding core fixing mechanism 100 again, at this time, the other end surface of the battery winding core and the negative tab on the end surface are exposed from the operation hole 101, then operate the tab flattening mechanism 200 again to flatten the negative tab. It should be noted that the tab flattening process in the above example is to flatten the positive tab first, then flatten the negative tab, but in other examples of the application, the negative tab can be flattened first, then the positive tab is flattened.

[0056] In another example, as shown in FIG. 2, the winding core fixing mechanism 100 in the tab flattening device has two operation holes 101, and the number of the tab flattening mechanism 200 is also two. In this case, the positive and negative tabs can be flattened simultaneously, and the exemplary process is as follows: first, fix the battery winding core to the winding core fixing mechanism 100 so that one end surface of the battery winding core and the positive tab on the end surface are exposed from one of the operation holes 101, then operate the tab flattening mechanism 200 to flatten the positive tab; after the positive tab is flattened, take out the battery winding core, rotate the winding core in the axial direction, then fix the battery winding core to the winding core fixing mechanism 100 again, at this time, the other end surface of the battery winding core and the negative tab on the end surface are exposed from the other operation hole 101, then operate the tab flattening mechanism 200 again to flatten the negative tab. It should be noted that the tab flattening process in the above example is to flatten the positive and negative tabs simultaneously, but in other examples of the application, the positive and negative tabs can be flattened in sequence. Figure 1As shown, the winding core fixing mechanism 100 in the tab flattening device has two opposite operation holes 101, and the number of the tab flattening mechanisms 200 is two. In this case, the positive and negative tabs can be flattened simultaneously, and the exemplary process is as follows: first, fix the battery winding core to the winding core fixing mechanism 100, so that the two end faces of the battery winding core and the positive and negative tabs on the two end faces are exposed from the operation holes 101, and then operate the two tab flattening mechanisms 200 to flatten the positive and negative tabs from the two sides of the winding core fixing mechanism 100 respectively, thereby completing the tab flattening of the battery winding core.

[0057] As shown in the drawings, Figure 6 The winding core fixing mechanism 100 provided by the embodiments of the present application includes a base 102 and a pressing member 103. The surface of the base 102 facing the pressing member 103 is provided with a first groove 1021, and at least one end of the first groove 1021 is open in a set direction. The surface of the pressing member 103 facing the base 102 is provided with a second groove 1031, and at least one end of the second groove 1031 is open in a set direction. The open ends of the first groove 1021 and the second groove 1031 should be located on the same side. The base 102 and the pressing member 103 are in separable contact, so as to buckle the first groove 1021 and the second groove 1031, thereby forming an accommodation cavity for accommodating the battery winding core. At least one end of the accommodation cavity in the set direction has an operation hole 101 formed by the open end of the first groove 1021 and the open end of the second groove 1031.

[0058] In the tab flattening mechanism 200 provided by the embodiments of the present application, the flattening assembly 1 and the force feedback assembly 2 are both installed through the bracket 3. As shown in the drawings, Figure 1 and Figure 2 In some embodiments, the bracket 3 includes a first fixed seat 31 and a second fixed seat 32 with fixed positions. The first fixed seat 31 and the second fixed seat 32 are arranged at intervals, thereby forming a matching space 33 between them, which is used to allow the installation and matching of the flattening assembly 1 and the force feedback assembly 2. The flattening assembly 1 is movably installed on the first fixed seat 31, and a part of the flattening assembly 1 can move in the matching space 33, that is, the matching space 33 constitutes the movement space of the part of the flattening assembly 1. The force feedback assembly 2 is installed on the second fixed seat 32, and the force feedback assembly 2 is connected to the part of the flattening assembly 1 located in the matching space 33.

[0059] The bracket 3 is arranged at intervals through the first fixed seat 31 and the second fixed seat 32, which facilitates the installation and fixation of other components, and at the same time provides movement space for the flattening assembly 1, thereby improving the structural integration and compactness of the tab flattening mechanism 200.

[0060] In some embodiments of the present application, as shown in the drawings, Figure 2As shown, the first fixing seat 31 is provided with an axial hole 311 penetrating in a set direction. The flattening assembly 1 comprises a flattening die 11, a second mounting member 12 and a guide rod 13. The flattening die 11 is located between the winding core fixing mechanism 100 and the first fixing seat 31. The second mounting member 12 is located in the matching space 33 and is connected with the force feedback assembly 2. The guide rod 13 penetrates the axial hole 311 and is movable in the axial hole 311. The two ends of the guide rod 13 are connected with the flattening die 11 and the second mounting member 12 respectively.

[0061] As shown in Figure 4 As shown, the flattening die 11 is provided with a flattening groove 111 with a trapezoidal cross section on the surface facing the operation hole 101. The flattening groove 111 is suitable for accommodating the tab extending from the end surface of the battery winding core and extruding the tab to bend towards the middle part of the winding core end surface. In the embodiment of the present application, the flattening die 11 comprises a plurality of different flattening dies 11, at least one of the size and shape of the flattening groove 111 of different flattening dies 11 is different.

[0062] The second mounting member 12 can be a mounting plate for example. One side of the mounting plate is connected with the flattening die 11 through at least one guide rod 13. The other side of the mounting plate has a structure for mounting and matching with the force feedback assembly 2, such as a second shaft part 121.

[0063] The number of guide rods 13 is at least one. Generally, in order to ensure the stability of the flattening assembly 1 during movement, the number of guide rods 13 is usually more than one, such as Figure 2 As shown, the number of guide rods 13 is two. Each guide rod 13 penetrates the axial hole 311 on the first fixing seat 31 and extends in a set direction. The guide rod 13 and the axial hole 311 on the first fixing seat 31 are gap-fitted, so that the guide rod 13 can move in the axial hole 311 to avoid excessive pressure on the tab during flattening. The guide rod 13 and the flattening die 11 are detachably connected, so as to replace different flattening dies 11 for the tab flattening mechanism 200, thereby adapting to different models and sizes of battery winding cores and different stages of tab flattening process.

[0064] In some embodiments of the present application, as shown in Figure 2 As shown, the force feedback assembly 2 can comprise a force transmission member 21 and a pressure detection member 22. The force transmission member 21 is movably mounted on the second fixing seat 32. One end of the force transmission member 21 is connected with the second mounting member 12 in the flattening assembly 1, and the other end of the force transmission member 21 is in pressure matching with the pressure detection member 22. The pressure detection member 22 is connected with the second fixing seat 32 and is used for collecting the pressure applied by the force transmission member 21.

[0065] Since the force transmission member 21 is only connected with the flattening assembly 1 and pressure-fitted with the pressure detection member 22, and is not connected or contacted with other components, the force transmission member 21 can completely transmit the reaction force from the core end face to the pressure detection member 22, thereby ensuring the accuracy of force detection.

[0066] Optionally, the pressure detection member 22 can be a pressure sensor. The pressure sensor is fixed on the second fixing seat 32 and pressure-fitted with the force transmission member 21, so as to collect the pressure applied by the force transmission member 21 on the pressure sensor, that is, the reaction force from the core end face transmitted by the force transmission member 21.

[0067] In some embodiments, as shown in Figure 3 The second fixing seat 32 can include a mounting sleeve 321, which is hollow inside and has an open end 3211 and a closed end 3212 opposite in a set direction. The open end 3211 is closer to the flattening assembly 1 than the closed end 3212. As shown in Figure 4 The pressure detection member 22 is located inside the mounting sleeve 321 and connected with the closed end 3212; the force transmission member 21 includes a top block 211 and a compression spring 212. The top block 211 is located inside the mounting sleeve 321 and abuts against the pressure detection member 22; the compression spring 212 is located on a side of the top block 211 away from the pressure detection member 22. One end of the compression spring 212 extends into the inside of the mounting sleeve 321 and elastically connects or abuts against the top block 211, and the other end of the compression spring 212 is located outside the mounting sleeve 321 and elastically connects or abuts against the flattening assembly 1.

[0068] It should be understood that in the embodiments of the present application, the compression spring 212 is always in an elastically compressed state after assembly, and therefore, “elastically connected or abutted” means that there is an interaction force between the end of the compression spring 212 connected or abutted with the top block 211 and the top block 211 based on the elastic force of the compression spring 212 itself; and there is also an interaction force between the end of the compression spring 212 connected or abutted with the flattening assembly 1 and the flattening assembly 1 based on the elastic force of the compression spring 212 itself.

[0069] The force transmission member 21 provided by the embodiments of the present application adopts the compression spring 212. When the driving movement amount of the driving assembly 4 relative to the support 3 is too large, the flattening assembly 1 can move reversely relative to the first fixing seat 31 based on the gap cooperation between the guide rod 13 and the shaft hole 311, so as to further compress the compression spring 212, thereby preventing the damage of the over-pressing of the tab. Moreover, the compression spring 212 can also well absorb the impact force generated in the movement process of the flattening assembly 1, thereby reducing the adverse effects of the impact force on the system, making the force transmission more stable, and the force detection more accurate. Moreover, the compression spring 212 is conducive to improving the transmission accuracy and can avoid the force detection errors caused by assembly errors and gaps.

[0070] Optionally, the compression spring 212 can be a metal spring, a plastic spring, a rubber spring, or other types of elastic members that have elasticity in a set direction.

[0071] In some embodiments of the present application, the top block 211 includes a limiting portion 2111 and a first shaft portion 2112, the circumferential side wall of the limiting portion 2111 is in contact with the inner side wall of the mounting sleeve 321, and the first shaft portion 2112 is connected to the surface of the limiting portion 2111 close to the open end 3211; wherein the compression spring 212 is sleeved on the outer side of the first shaft portion 2112 and abuts against the limiting portion 2111.

[0072] The limiting portion 2111 is used to limit the movement direction of the top block 211 in the mounting sleeve 321, so as to ensure that the reaction force from the end face of the roll core transmitted by the compression spring 212 can act on the pressure detection member 22 in a set direction, thereby ensuring the accuracy of force detection. The outer periphery of the limiting portion 2111 is the same shape as the inner cavity of the mounting sleeve 321, and the size is adapted. For example, when the cross section of the internal cavity of the mounting sleeve 321 is rectangular, the shape of the outer periphery of the limiting portion 2111 is also rectangular; when the cross section of the internal cavity of the mounting sleeve 321 is circular, the shape of the outer periphery of the limiting portion 2111 is also circular. The axial side wall of the limiting portion 2111 and the inner side wall of the mounting sleeve 321 are in clearance fit, so as to ensure that the limiting portion 2111 can move in the internal sleeve with little resistance, and at the same time, it will not be skewed or turned over.

[0073] Optionally, in order to further reduce the friction between the outer peripheral wall of the limiting portion 2111 and the inner side wall of the mounting sleeve 321 during the movement of the top block 211, and reduce the influence on the accuracy of force detection, a plurality of balls can be arranged on the outer peripheral wall of the limiting portion 2111, and the plurality of balls are in rolling fit with the inner side wall of the mounting sleeve 321.

[0074] As shown in Figure 2 , the first shaft portion 2112 is installed on the side of the limiting portion 2111 facing the first fixed seat 31, and the diameter of the first shaft portion 2112 is smaller than the inner diameter of the compression spring 212, so that one end of the compression spring 212 is sleeved on the first shaft portion 2112 and abuts against the limiting portion 2111, thereby achieving installation.

[0075] Optionally, continuing to refer to Figure 2 , the second mounting member 12 of the flat assembly 1 can be provided with a second shaft portion 121, the second shaft portion 121 is located on the plate surface of the second mounting member 12 facing the force transmission member 21, and the diameter of the second shaft portion 121 is smaller than the inner diameter of the compression spring 212, so that the other end of the compression spring 212 can be sleeved on the second shaft portion 121 and abut against the plate surface of the second mounting member 12, thereby achieving installation.

[0076] With the mounting mode described above, the compression spring 212 can be easily and conveniently assembled to the bracket 3, thus reducing the assembly difficulty of the compression spring 212 and improving the assembly efficiency of the tab flattening device.

[0077] In some embodiments of the present application, as shown in Figure 3 and Figure 4 The mounting sleeve 321 includes a sleeve body 3213 and an adjusting end cover 3214, the sleeve body 3213 is open at opposite ends in a set direction, and the adjusting end cover 3214 blocks one end of the sleeve body 3213, thereby forming a closed end 3212 of the mounting sleeve 321. At least a part of the adjusting end cover 3214 can move relative to the sleeve body 3213 in the set direction, and the pressure detection member 22 is connected with the adjusting end cover 3214.

[0078] By adjusting the position of the adjusting end cover 3214 relative to the sleeve body 3213, the distance between the flattening assembly 1 and the winding core fixing mechanism 100 can be adjusted, so that the tab flattening device is adapted to batteries of different models and different sizes. For example, for a battery with a larger axial size, in order to avoid over-pressing the tab during flattening, the distance between the adjusting end cover 3214 and the open end 3211 of the mounting sleeve 321 is usually relatively far; for a battery with a smaller axial size, in order to avoid that the tab is not pressed in place during flattening, the distance between the adjusting end cover 3214 and the open end 3211 of the mounting sleeve 321 is usually relatively close.

[0079] In one example, the adjusting end cover 3214 can be a one-piece structure. The adjusting end cover 3214 can be threadedly connected with the sleeve body 3213, so as to adjust the position inside the sleeve body 3213. For example, the circumferential side wall of the adjusting end cover 3214 is provided with external threads, and at least a part of the inner side wall of the sleeve body 3213 is provided with internal threads, and the adjusting end cover 3214 and the sleeve body 3213 are threadedly connected based on the internal and external threads, and by rotating the adjusting end cover 3214, the position of the adjusting end cover 3214 inside the sleeve body 3213 can be adjusted.

[0080] In another example, the adjusting end cover 3214 can be a split structure composed of at least two parts. As shown in Figure 3As shown, the adjusting end cover 3214 includes a cover plate 32141 and an adjusting knob 32142, the cover plate 32141 is fixedly connected with one end of the sleeve body 3213, and a through hole is arranged on the cover plate 32141; the adjusting knob 32142 passes through the through hole on the cover plate 32141 and is movably installed on the cover plate 32141. Among them, an outer thread is arranged on the circumferential side wall of the adjusting knob 32142, an inner thread is arranged on the hole wall of the through hole of the cover plate 32141, and the adjusting knob 32142 and the cover plate 32141 are threadedly connected based on the inner and outer threads. By rotating the adjusting knob 32142, the extension length of the adjusting knob 32142 inside the sleeve body 3213 can be adjusted, so that the distance between the flattening assembly 1 and the core fixing mechanism 100 is adjusted.

[0081] Compared with the integrated structure in the last example, Figure 3 As shown in the split adjusting end cover 3214 structure, the matching position of the adjusting knob 32142 and the cover plate 32141 is away from the inner side wall of the sleeve body 3213, so the inner side wall of the sleeve body 3213 can remain smooth and will not affect the movement of the top block 211, thereby ensuring the accuracy of force detection.

[0082] Optionally, a first fixing part 32143 is arranged on the adjusting end cover 3214, and a second fixing part 2211 is arranged on the surface of the pressure detection piece 22 facing the adjusting end cover 3214, the first fixing part 32143 and the second fixing part 2211 are one of a protrusion and a groove and the other, and the protrusion and the groove are interference fit, so as to realize the installation and fixation of the pressure detection piece 22 on the adjusting end cover 3214. By using the interference fit method to install the pressure detection piece 22, the assembly efficiency of the pressure detection piece 22 can be improved, and the assembly complexity is reduced.

[0083] In some embodiments of the present application, as Figure 3 As shown, the second fixing seat 32 further includes a first mounting piece 322, the first mounting piece 322 is connected to the open end 3211 of the mounting sleeve 321, and a through hole 3221 communicating with the open end 3211 of the mounting sleeve 321 is arranged on the first mounting piece 322, and a matching space 33 is formed between the first mounting piece 322 and the first fixing seat 31.

[0084] The second fixing seat 32 can be fixed in position relative to the first fixing seat 31 based on the first mounting piece 322. In one example, as Figure 2 As shown, the bracket 3 further includes at least one connecting rod 35, and the first mounting piece 322 is connected with the first fixing seat 31 through the connecting rod 35. In order to ensure sufficient connection strength and improve connection reliability, the number of connecting rods 35 can be multiple, for example Figure 2Four connecting rods 35 are shown in the figure, which are arranged at intervals around the shaft hole 311 on the first fixing seat 31, so as to avoid interference with the guide rod 13 passing through the shaft hole 311 and the second mounting member 12 located in the matching space 33. In another example, the support 3 can include a bottom plate 34, the first fixing seat 31 is connected to the bottom plate 34 for fixation, and the first mounting member 322 is also connected to the bottom plate 34 for fixation.

[0085] It should be noted that, as Figure 2 shown, for the scheme that the first mounting member 322 is connected to the first fixing seat 31 through the connecting rod 35, the support 3 can also include a bottom plate 34 connected with the first fixing seat 31 and / or the first mounting member 322.

[0086] The driving assembly 4 can be connected with at least one of the first fixing seat 31 and the second fixing seat 32, or can be connected with the bottom plate 34 of the support 3, so as to drive the support 3 to move.

[0087] In some embodiments, as Figure 2 shown, the driving assembly 4 includes a track member 41, a moving member 42 and a power member 43; the track member 41 has a track extending in a set direction; the moving member 42 is installed on the track and fixedly connected with the support 3; and the power member 43 is connected with the track member 41 or the moving member 42, so as to drive the moving member 42 to reciprocally move along the extending direction of the track.

[0088] Optionally, the track member 41 includes a sliding rail, and the moving member 42 is a sliding block which is slidingly installed on the sliding rail and fixedly connected with the bottom plate 34 of the support 3; and the power member 43 is an electric push-pull rod connected with the sliding block, so as to drive the sliding block to slide on the sliding rail.

[0089] Optionally, the track member 41 is a screw rod in a lead screw, and the moving member 42 is a nut in the lead screw, the nut is sleeved on the screw rod and threadedly connected with the screw rod, and the nut is also fixedly connected with the bottom plate 34 of the support 3; and the power member 43 is a rotating motor connected with the screw rod, so as to drive the screw rod to rotate and in turn drive the nut to reciprocally move in a set direction.

[0090] Optionally, the track member 41 includes a track belt, and the moving member 42 is a support fixed on the track belt, the support is fixedly connected with the bottom plate 34 of the support 3; and the power member 43 includes a motor with a transmission wheel, the track belt is wound on the transmission wheel of the motor, and the transmission wheel of the motor is rotated to drive the track belt to move, and in turn drive the support to move in a set direction.

[0091] The tab flattening device provided by the embodiments of the present application further includes a control device 5, as Figure 5As shown, the control device 5 is in signal connection with the force feedback assembly 2 to receive the reaction force from the battery roll core on the flattening assembly 1 acquired by the force feedback assembly 2; and the control device 5 is in signal connection with the driving assembly 4 to control the driving displacement amount of the driving assembly 4 to the support 3.

[0092] The signal connection between the control device 5 and the force feedback assembly 2 and the driving assembly 4 can be wired connection or wireless connection.

[0093] For example, when the control device 5 and the pressure detection piece 22 in the force feedback assembly 2 are in wired connection, as shown in Figure 3 and Figure 4 The sleeve body 3213 is provided with a strip-shaped notch 32131 extending in a set direction; the pressure detection piece 22 includes a pressure sensing part 221 and an electrical connection part 222, the pressure sensing part 221 is connected with the adjusting end cover 3214, one end of the electrical connection part 222 is electrically connected with the pressure sensing part 221, and the other end of the electrical connection part 222 passes out of the strip-shaped notch 32131.

[0094] The pressure sensing part 221 can be a pressure sensor, and the electrical connection part 222 can be an electrical connection wire, one end of the electrical connection wire is connected with the pressure sensor, and the other end of the electrical connection wire is connected with the control device 5, so that the pressure collected by the pressure sensor is transmitted to the control device 5 in real time or periodically, so that the control device 5 controls the driving assembly 4 to stop, i.e. stops driving the support 3 to move, after detecting that the pressure collected by the pressure sensor is greater than a first set threshold. The first set threshold is pre-stored in the control device 5 by the technician, and the first set threshold corresponds to the minimum pressure cutoff threshold corresponding to the best end face forming effect verified by experiment. When the pressure of the roll core end face on the flattening assembly 1 is greater than the first set threshold, it means that all the tabs on the end face have been flattened in place under normal circumstances.

[0095] Optionally, one end of the strip-shaped notch 32131 close to the open end 3211 of the mounting sleeve 321 has a spacing from the open end 3211 of the mounting sleeve 321; and one end of the strip-shaped notch 32131 close to the closed end 3212 of the mounting sleeve 321 extends to the edge of the sleeve body 3213, so as to adapt to the adjusting end cover 3214 located at different positions in the sleeve body 3213, or the adjusting knob 32142 having different extension lengths in the sleeve body 3213.

[0096] In some embodiments of the present application, as shown in Figure 6 The tab flattening mechanism 200 further includes a displacement detection piece 6 for acquiring the driving movement amount of the driving assembly 4 to the support 3, and the displacement detection piece 6 is in signal connection with the control device 5.

[0097] The displacement detection member 6 can be a displacement sensor, for example, which can collect the driving movement amount of the driving assembly 4 to the support 3 and send to the control device 5. The "driving movement amount" refers to the movement distance of the support 3 due to the driving of the driving assembly 4. The displacement detection member 6 and the control device 5 can be connected by wire or wirelessly.

[0098] By arranging the displacement detection member 6, the flatting effect of the tab can be judged from the size, so as to further ensure the forming effect of the core end face. For example, after the driving assembly 4 stops, the control device 5 judges whether the driving movement amount obtained by the displacement detection member 6 is between the second set threshold and the third set threshold according to the driving movement amount obtained by the displacement detection member 6, the third set threshold being greater than the second set threshold. The second set threshold and the third set threshold are pre-stored in the control device 5 by the technician, and the second set threshold and the third set threshold correspond to the size threshold range of the best end face forming effect verified by experiment. If the driving movement amount is less than the second set threshold, it means that the tab of the core is not completely flattened, and at this time, the machine needs to be stopped to check the reason; if the driving movement amount is greater than the third set threshold, it means that the tab of the core can be over-flattened, and at this time, the machine also needs to be stopped to check the reason. If the driving movement amount is between the second set threshold and the third set threshold, it means that the tab is flattened, and the height dimension of the formed end face in the set direction meets the requirements, that is, the end face forming effect of the core reaches the expectation.

[0099] In some embodiments of the present application, the tab flattening device can further include an alarm connected with the control device 5. When the driving movement amount is less than the second set threshold or greater than the third set threshold, the control device 5 sends a signal to the alarm; in response to the signal, the alarm alarms in the form of sound signal or light signal.

[0100] In summary, taking the tab flattening device shown in Figure 1 as an example, the working principle of the tab flattening device provided in the embodiments of the present application is introduced.

[0101] As shown in Figure 1 , the operator (or the mechanical hand) places the battery core on the base 102, positions it, and then lowers the pressing member 103 and buckles it on the base 102 to fix the core; then, the tab flattening mechanism 200 on both sides of the core fixing mechanism 100 is used to simultaneously perform tab flattening forming on the positive and negative end faces of the core. The working processes of the two tab flattening mechanisms 200 are the same, and the tab flattening forming of the positive end face is taken as an example for description.

[0102] The flattening die 11 in the flattening assembly 1 is driven by the driving assembly 4 to move towards the positive electrode end face of the battery core. When the flattening die 11 contacts the positive electrode tab extending from the positive electrode end face, the positive electrode tab is pressed and bent towards the middle part of the positive electrode end face. At the same time, the flattening die 11 is subjected to a reaction force from the positive electrode end face, which is transmitted to the pressure detection member 22 through the guide rod 13, the second mounting member 12 and the compression spring 212, and finally to the control device 5.

[0103] The control device 5 is pre-set with a first set threshold value a corresponding to the cut-off pressure, and a second set threshold value b and a third set threshold value c corresponding to the cut-off position, where c > b. During the end face forming process, when the pressure value fed back by the pressure sensor is greater than a, the control device 5 controls the driving assembly 4 to stop driving, and the displacement detection member 6 acquires the driving movement amount of the driving assembly 4 to the support 3. Subsequently, the control device 5 determines whether the driving movement amount is between the second set threshold value b and the third set threshold value c (i.e. whether it is within the range of b-c). If the driving movement amount is within the range of b-c, it indicates that the end face forming effect meets the expectation; if the driving movement amount is not within the range, the control device 5 controls the alarm to alarm and stops to check the reason.

[0104] After the positive electrode end face and the negative electrode end face of the battery core are formed, the operator (or the mechanical hand) makes the pressing member 103 rise to take out the battery core.

[0105] It should be noted that the end face forming process of the battery core may need to perform multiple tab flattening procedures, and the action mechanism is basically the same each time. As described above, only the flattening die 11 used each time may be different, so only the flattening die 11 needs to be replaced when performing different tab flattening procedures.

[0106] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated.

[0107] The above description is only for the convenience of those skilled in the art to understand the technical solutions of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A tab flattening device, characterized by, The device comprises a roll core fixing mechanism (100) and at least one tab flattening mechanism (200); The roll core fixing mechanism (100) has at least one operation hole (101) for allowing the end face of the battery roll core to be exposed therefrom; The tab flattening mechanism (200) comprises a flattening assembly (1), a force feedback assembly (2), a bracket (3) and a driving assembly (4); The flattening assembly (1) and the force feedback assembly (2) are both mounted on the bracket (3), wherein the flattening assembly (1) is arranged to face the operation hole (101), and the force feedback assembly (2) is used to acquire the reaction force of the flattening assembly (1) from the battery roll core; The bracket (3) is connected with the driving assembly (4) and can be driven by the driving assembly (4) to drive the flattening assembly (1) to reciprocate in a set direction, which is parallel to the axial direction of the operation hole (101).

2. The tab flattening device of claim 1, wherein The bracket (3) comprises a first fixing seat (31) and a second fixing seat (32), which are arranged in a spaced manner to form a matching space (33) therebetween; The flattening assembly (1) is movably mounted on the first fixing seat (31), and a part of the flattening assembly (1) can move in the matching space (33); The force feedback assembly (2) is mounted on the second fixing seat (32), and the force feedback assembly (2) is connected with the part of the flattening assembly (1) located in the matching space (33).

3. The tab flattening device of claim 2, wherein The force feedback assembly (2) comprises a force transmission member (21) and a pressure detection member (22); One end of the force transmission member (21) is connected with the flattening assembly (1), and the other end of the force transmission member (21) is in pressure fit with the pressure detection member (22); The pressure detection member (22) is connected with the second fixing seat (32), and is used to collect the pressure applied by the force transmission member (21).

4. The tab flattening device of claim 3, wherein The second fixing seat (32) comprises a mounting sleeve (321) having an open end (3211) and a closed end (3212) opposite in the set direction; The pressure detection member (22) is located in the interior of the mounting sleeve (321) and is connected with the closed end (3212); The force transmission member (21) comprises a top block (211) and a compression spring (212), wherein the top block (211) is located in the interior of the mounting sleeve (321) and abuts against the pressure detection member (22); the compression spring (212) is located on the side of the top block (211) away from the pressure detection member (22), one end of the compression spring (212) extends into the interior of the mounting sleeve (321) and is elastically connected with or abuts against the top block (211), and the other end of the compression spring (212) is located outside the mounting sleeve (321) and is elastically connected with or abuts against the flattening assembly (1).

5. The tab flattening device of claim 4, wherein The top block (211) comprises a limiting part (2111) and a first shaft part (2112), a circumferential side wall of the limiting part (2111) is in contact with an inner side wall of the mounting sleeve (321), and the first shaft part (2112) is connected with a surface of the limiting part (2111) close to the open end (3211). The compression spring (212) is sleeved on the outside of the first shaft part (2112) and abuts against the limiting part (2111).

6. The tab flattening device of claim 4, wherein The mounting sleeve (321) comprises a sleeve body (3213) and an adjusting end cover (3214), the sleeve body (3213) is open at opposite ends in the set direction, and the adjusting end cover (3214) blocks one end of the sleeve body (3213), thereby forming a closed end (3212) of the mounting sleeve (321). At least a part of the adjusting end cover (3214) can move relative to the sleeve body (3213) in the set direction, and the pressure detection piece (22) is connected with the adjusting end cover (3214).

7. The tab flattening device of claim 6, wherein The sleeve body (3213) is provided with a strip-shaped gap (32131) extending in the set direction; The pressure detection piece (22) comprises a pressure sensing part (221) and an electricity connecting part (222), the pressure sensing part (221) is connected with the adjusting end cover (3214), one end of the electricity connecting part (222) is electrically connected with the pressure sensing part (221), and the other end of the electricity connecting part (222) penetrates out of the strip-shaped gap (32131).

8. The tab flattening device of claim 4, wherein, The second fixing seat (32) further comprises a first mounting piece (322), the first mounting piece (322) is connected to the open end (3211) of the mounting sleeve (321), and the first mounting piece (322) is provided with a through hole (3221) in communication with the open end (3211) of the mounting sleeve (321), and the matching space (33) is formed between the first mounting piece (322) and the first fixing seat (31). The bracket (3) further comprises a bottom plate (34), the first fixing seat (31) and the first mounting piece (322) are connected to the bottom plate (34); and / or the bracket (3) further comprises at least one connecting rod (35), and the first mounting piece (322) is connected with the first fixing seat (31) through the connecting rod (35).

9. The tab flattening device of claim 2, wherein, The first fixing seat (31) is provided with a shaft hole (311) penetrating in the set direction. The flattening assembly (1) comprises a flattening die (11), a second mounting member (12) and a guide rod (13), the flattening die (11) is located between the core fixing mechanism (100) and the first fixing seat (31); the second mounting member (12) is located in the matching space (33) and is matched and connected with the force feedback assembly (2); the guide rod (13) passes through the shaft hole (311) and can move in the shaft hole (311), and two ends of the guide rod (13) are connected with the flattening die (11) and the second mounting member (12) respectively.

10. The tab flattening device of any of claims 1-9, wherein, The device comprises control means (5), which are signal connected with the force feedback assembly (2) and the driving assembly (4).

11. The tab flattening device of claim 10, wherein, The tab flattening mechanism (200) further comprises displacement detection means (6) for obtaining the driving movement amount of the driving assembly (4) to the support (3), and the displacement detection means (6) are signal connected with the control means (5).

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