Cylindrical battery tab pre-folding device

Abstract

The utility model discloses a pre-folding device for a pole lug of a cylindrical battery, and relates to the technical field of battery core winding devices. Comprising a driving mechanism and a pre-folding mechanism; the pre-folding mechanism is mounted on the driving mechanism, and the driving mechanism drives the pre-folding mechanism to be close to or away from the battery cell according to the thickness of the battery cell; the pre-folding mechanism comprises a rotary driving unit and at least one pre-folding wheel, the outer surface of the pre-folding wheel is in contact with the outer surface of the tab of the battery cell, and the pre-folding wheel and the battery cell are driven by the rotary driving unit to rotate synchronously. The pre-folding wheel has the advantages that the pre-folding wheel can be driven by the driving unit to rotate, and the rotation direction of the pre-folding wheel can be kept consistent with the winding direction of the battery cell. And under the driving of the driving mechanism, the distance between the pre-folding wheel and the battery cell is adaptively changed along with the change of the radius of the battery cell, so that the distance between the pre-folding wheel and the pole piece is adjusted, and the problems that the angle is not controlled, the pole lug is bent disorderly, the pole lug is turned outwards and the pole lug is wrinkled in the pre-folding process in a passive mode can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of winding device of electricity core, specifically, the utility model relates to a cylindrical battery tab pre-folding device. BACKGROUND

[0002] At present, more and more large cylindrical batteries adopt full-tab die-cut winding core structure, and the tabs need to be pre-folded at a certain angle during the winding process of the electricity core, otherwise it will affect the subsequent electricity core tab end surface rubbing and flattening process. However, after the pre-folding of the tab in the prior art, the tab may be disorderedly bent or everted; if it is not found or handled in time, it may cause the positive plate and the negative plate to be connected in short circuit, affect the safety of the electricity core production, and exist safety hazards. For example, the tab pre-folding device and the winding equipment disclosed in CN217647218U, which adopts a bending piece with a guide inclined surface to pre-fold the tab by contacting the guide inclined surface of the bending piece during the winding process of the electricity core. This pre-folding method is passive, and the pre-folding angle of the tab is not controlled, which may cause the tab to be skewed or everted, and may cause the positive plate and the negative plate to be connected in short circuit, which exists safety hazards in battery production. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the utility model provides a cylindrical battery tab pre-folding device, which can effectively avoid the problems of uncontrolled angle, disordered tab bending, tab eversion and tab wrinkling in the passive pre-folding process.

[0004] The utility model solves the technical problems by adopting the following technical scheme: a cylindrical battery tab pre-folding device, the improvement lies in that the pre-folding mechanism is installed on the driving mechanism, and the driving mechanism drives the pre-folding mechanism to approach or move away from the electricity core according to the thickness of the electricity core.

[0005] The pre-folding mechanism includes a rotary driving unit and at least one pre-folding wheel, the outer surface of the pre-folding wheel is in contact with the outer surface of the tab of the electricity core, and the pre-folding wheel is driven to rotate synchronously with the electricity core by the rotary driving unit.

[0006] In the above technical scheme, the driving mechanism includes a first motor and a lead screw; the first motor is connected with the lead screw, and the lead screw is connected with the pre-folding mechanism.

[0007] In the above technical scheme, the driving mechanism further includes a first transmission unit, the first transmission unit includes a first transmission wheel, a second transmission wheel and a first transmission belt; the first transmission wheel is connected with the output end of the first motor, the second transmission wheel is connected with one end of the lead screw, and the first transmission belt is sleeved on the two transmission wheels.

[0008] The pre-folding mechanism comprises a connecting plate and a linear guide rail; the connecting plate is connected with the screw rod, a sliding groove is formed in the connecting plate, and the linear guide rail is located below the connecting plate; the connecting plate is connected with the linear guide rail through the sliding groove, so that the connecting plate moves linearly on the linear guide rail.

[0009] The pre-folding mechanism further comprises a connecting shaft, two first gears, two second gears and two pre-folding wheel driving shafts; the driving unit is connected with the connecting shaft and drives the connecting shaft to rotate; the two first gears are installed at two ends of the connecting shaft; the two second gears are respectively engaged with the two first gears; and the two ends of the pre-folding wheel driving shaft are respectively provided with the second gear and the pre-folding wheel.

[0010] The driving unit is a second motor.

[0011] The pre-folding mechanism further comprises a second transmission unit, which comprises a third transmission wheel, a fourth transmission wheel and a second transmission belt; the third transmission wheel is connected with the output end of the second motor; the fourth transmission wheel is connected with one end of the connecting shaft; and the second transmission belt is sleeved on the two transmission wheels.

[0012] The pre-folding mechanism further comprises a mounting frame, which comprises a horizontal rod and two vertical rods; the two vertical rods are perpendicularly installed at two ends of the horizontal rod; first through holes and second through holes are respectively formed in the two vertical rods; the two ends of the connecting shaft are installed in the first through holes of the two vertical rods; the two pre-folding wheel driving shafts are respectively inserted into the second through holes of the two vertical rods; and the second gear and the pre-folding wheel are respectively located on the two sides of the vertical rods.

[0013] The pre-folding wheel driving shaft is adjustably installed in the second through hole, and the distance between the two ends of the pre-folding wheel driving shaft and the vertical rod can be adjusted.

[0014] The driving mechanism further comprises a mounting base, and the first motor and the screw rod are installed on the mounting base.

[0015] The pre-folding wheel is abutted on the electrode tab of the battery cell to pre-fold the electrode tab, the pre-folding wheel can be driven to rotate by the driving unit, the rotation direction of the pre-folding wheel is consistent with the winding direction of the battery cell, and the rotation speed of the pre-folding wheel is matched with the winding speed of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1The utility model discloses a cylindrical battery pole ear pre -folding device's structure schematic view.

[0017] Figure 2 The utility model discloses a cylindrical battery pole ear pre -folding device's plan view.

[0018] Figure 3 The utility model discloses a cylindrical battery pole ear pre -folding device's structure schematic view of first drive unit.

[0019] Figure 4 The utility model discloses a cylindrical battery pole ear pre -folding device's structure schematic view of second drive unit.

[0020] Figure 5 The utility model discloses a cylindrical battery pole ear pre -folding device's structure schematic view of mounting frame.

[0021] Figure 6 The utility model discloses a cylindrical battery pole ear pre -folding device's side view.

[0022] Figure 7 The utility model discloses a cylindrical battery pole ear pre -folding device's another angle structure schematic view. Specific implementation

[0023] The utility model will be further explained below combining with the drawings and embodiment.

[0024] the concept, specific structure and the technical effect of the utility model will be clearly and completely described below combining with the embodiment and drawing to understand the purpose, feature and effect of the utility model fully. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment, and the other embodiment obtained by the skilled in the art without the premise of the creative labor of the embodiment of the utility model, all belong to the scope of the utility model protection. In addition, all the coupling / connection relations involved in the patent, not the direct interface of the component, but can form the better coupling structure by adding or reducing the coupling auxiliary member according to the specific implementation situation. The various technical features in the utility model creation can be interactively combined under the premise of not mutually contradictory conflict.

[0025] Reference Figure 1 and Figure 2The utility model provides a cylindrical battery pole ear pre -folding device, including drive mechanism 1 and pre -folding mechanism 2.Pre -folding mechanism 2 is installed on drive mechanism 1, and drive mechanism 1 is close to or away from the pre -folding mechanism 2 of electric core 3 according to the thickness of electric core 3.The pre -folding mechanism 2 in it is to the effect of pre -folding the pole ear 301 of electric core 3.Electric core 3 continuously changes in the winding process, and the pole ear 301 is very fragile and easily damaged, so the distance between pre -folding mechanism 2 and electric core 3 needs to be kept at all times, and the pressure between pre -folding mechanism 2 and the pole ear 301 should be kept consistent at all times to avoid damage to the pole ear 301.The linear drive of drive mechanism 1 to pre -folding mechanism 2 is to keep the relative position of pre -folding mechanism 2 and the pole ear 301 consistent at all times, and when the diameter of electric core 3 gradually increases, drive mechanism 1 drives pre -folding mechanism 2 to gradually move away from electric core 3, thereby ensuring that the distance between pre -folding mechanism 2 and electric core 3 remains consistent at all times.

[0026] For the pre -folding mechanism 2, refer to Figure 1 、 Figure 6 and Figure 7 The utility model provides a specific embodiment, pre -folding mechanism 2 includes rotary drive unit and two pre -folding wheels 203, and the outer surface of pre -folding wheel 203 is in contact with the outer surface of the pole ear 301 of electric core 3, and the pre -folding wheel 203 is driven to rotate synchronously with electric core 3 by rotary drive unit.Two pre -folding wheels 203 are corresponding to the two pole ears 301 of electric core 3, and the two pre -folding wheels 203 are arranged in parallel and respectively abut against the two pole ears 301, pre -folding the pole ear 301 during the rotation of electric core 3.The abutment mode of pre -folding wheel 203 and pole ear 301 should be understood as the outer surface of pre -folding wheel 203 abutting against the pole ear 301, and the outer surface means the outer curved surface of the wheel body.The pre -folding wheel 203 is pre -folded to the pole ear 301 by the curved characteristics of the outer side of the wheel body itself, and the pre -folding wheel 203 is driven to rotate by the drive unit, which can keep the rotation speed of the pre -folding wheel 203 matched with the rotation speed of electric core 3, thereby driving the pole ear 301 to pre -fold in the direction of the center of electric core 3.

[0027] The device provided by the utility model pre -folds the pole ear in the form of pre -folding wheel, and the full pole ear after die cutting is pre -folded at a preset angle, becomes orderly, avoids the situation such as pole ear wrinkle and everted, avoids short circuit, improves battery production safety.Compared with the bending piece 40 with guide inclined plane 403 mentioned in the comparative document, the pre -folding wheel is dynamic pre -folding, and the bending piece and the pole ear are in a static state and a motion state respectively, which avoids the uncontrolled pre -folding angle of the pole ear and the situation such as skew and everted, which may cause the communication short circuit of positive plate and negative plate and exist battery production safety hidden danger.

[0028] Specifically, for the implementation mode of the drive unit, combined with Figure 1 ,Figure 2 As shown, the driving mechanism includes a first motor 101, a mounting base 103, and a lead screw 104. The first motor 101 and the lead screw 104 are mounted on the mounting base 103. The first motor 101 drives the lead screw 104 to rotate. The lead screw 104 is connected to the pre-folding mechanism 2 to drive the pre-folding mechanism 2 to achieve translation. When the first motor 101 drives the lead screw 104 to rotate, the pre-folding mechanism 2 can move linearly on the lead screw 104. This linear movement is the process of moving closer to or away from the battery cell 3. As the diameter of the battery cell 3 changes, the distance between the pre-folding mechanism 2 and the battery cell 3 can be adjusted by the first motor 101 and the lead screw 104 to ensure that the relative pressure between the pre-folding wheel 203 and the tab 301 remains consistent.

[0029] Furthermore, refer to Figure 1 and Figure 3 As shown, the drive mechanism 2 also includes a first transmission unit 102, which includes a first transmission wheel 1022, a second transmission wheel 1023, and a first transmission belt 1021. The first transmission wheel 1022 is fixed to the output end of the first motor 101, which is the motor shaft. The second transmission wheel 1023 is fixedly connected to one end of the lead screw 104. The first transmission belt 1021 is sleeved on the two transmission wheels. When the first motor 101 starts, its shaft drives the first transmission wheel 1022 to rotate. When the first transmission wheel 1022 rotates, it drives the first transmission belt 1021 to rotate, which in turn drives the second transmission wheel 1023 to rotate. Since the lead screw 104 is connected to the second transmission wheel 1023, the second transmission wheel 1023 also drives the lead screw 104 to rotate when it rotates. Through the transmission method of the first transmission unit 102, the first motor 101 and the lead screw 104 can be placed side by side. The first motor 101 is located on one side of the lead screw 104, and the pre-folding mechanism 2 is connected to the other side of the lead screw 104. This can achieve linear drive of the pre-folding mechanism 2 while saving space and reducing the overall space occupation of the device.

[0030] See also Figure 1 and Figure 2As shown in the middle, the pre-folding mechanism 2 includes a connecting plate 211 and a linear guide rail 105. One end of the connecting plate 211 is provided with a screw nut, and the screw nut is installed on the lead screw 104. A sliding groove is formed on the connecting plate 211, and the linear guide rail 105 is located below the connecting plate 211. The connecting plate 211 is slidably installed on the linear guide rail 105 by cooperating with the sliding groove and the linear guide rail 105. Therefore, the rotation of the lead screw 104 is finally converted into the reciprocating motion of the connecting plate 211 on the linear guide rail 105. The connecting plate 211 moves linearly on the linear guide rail 105. The connecting plate 211 is a bridge connecting the driving mechanism 1 and the pre-folding mechanism 2. Other components of the pre-folding mechanism 2 are directly or indirectly connected to the connecting plate 211. When the connecting plate 211 moves linearly with the rotation of the lead screw 104, other components of the pre-folding mechanism 2 on the connecting plate 211 also move linearly with the lead screw 104. The linear guide rail 105 is arranged below the connecting plate 211 to support the connecting plate 211, avoid the connecting plate 211 from being overloaded and shaking or tilting during movement, ensure the stability of the pre-folding of the tab 301 by the pre-folding wheel 203, and thus improve the production quality of the battery.

[0031] For the rotation driving of the pre-folding wheel 203, refer to Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown in the middle, the pre-folding mechanism 2 provided in the device further includes a connecting shaft 208, two first gears 209, two second gears 210 and two pre-folding wheel driving shafts 205. The driving unit is a second motor 201, which is installed in a motor mounting seat 206, and the motor mounting seat 206 is installed on the connecting plate 211. The second motor 201 is connected with the connecting shaft 208 and drives the connecting shaft 208 to rotate. The two first gears 209 are installed at both ends of the connecting shaft 208. The two second gears 210 are respectively engaged with the two first gears 209. The two ends of the pre-folding wheel driving shaft 205 are respectively installed with the second gear 210 and the pre-folding wheel 203. The second motor 201 drives the connecting shaft 208 to rotate, and the first gears 209 installed at both ends of the connecting shaft 208 will rotate with the connecting shaft 208. Since the first gears 209 and the second gears 210 are in meshing relationship, the rotation of the first gears 209 will drive the second gears 210 to rotate. Since the two ends of the pre-folding wheel driving shaft 205 are respectively installed with the second gear 210 and the pre-folding wheel 203, the rotation of the second gear 210 will drive the pre-folding wheel driving shaft 205 to rotate, and the pre-folding wheel driving shaft 205 drives the pre-folding wheel 203 to rotate, thereby realizing the rotation of the pre-folding wheel 203.

[0032] Refer to Figure 1 and Figure 4For the second motor 201 drives the connecting shaft 208 to rotate, the device provided by the utility model further includes a second transmission unit 202, the second transmission unit 202 includes a third transmission wheel 2023, a fourth transmission wheel 2022 and a second transmission belt 2021, the third transmission wheel 2023 is connected with the output end of the second motor 201, the fourth transmission wheel 2022 is connected with one end of the connecting shaft 208, and the second transmission belt 2021 is sleeved on the two transmission wheels. Its specific implementation mode is consistent with the first transmission unit 102, and the rotation of the second motor 201 is transmitted to the connecting shaft 208 through the cooperation of the third transmission wheel 2023, the fourth transmission wheel 2022 and the second transmission belt 2021, and the second motor 201 can drive the connecting shaft 208 to rotate at the same time, and the first transmission unit 102 can simplify the occupied space of the whole device. The second motor 201 is arranged side by side with the connecting shaft 208, is not arranged at one end of the connecting shaft 208, improves the space utilization rate, and the weight distribution on the connecting plate 211 is uniform, the stability of the connecting plate 211 is guaranteed, and then the stability of the pre-folding wheel 203 is guaranteed, so that the pre-folding efficiency of the pre-folding wheel 203 on the tab 301 is high and the quality is good.

[0033] For the specific installation mode of the pre-folding wheel 203, refer to Figure 5 The pre-folding mechanism 2 further includes a mounting frame 207, and the mounting frame 207 includes a horizontal rod 2071 and two vertical rods 2072. The two vertical rods 2072 are vertically installed at two ends of the horizontal rod 2071, first through holes and second through holes are formed in the two vertical rods 2072 respectively, two ends of the connecting shaft 208 are installed in the first through holes of the two vertical rods 2072, and the two pre-folding wheel driving shafts 205 are inserted into the second through holes of the two vertical rods 2072 respectively. The second gear 210 and the pre-folding wheel 203 are located on the two sides of the vertical rod 2072. Through the mounting mode of the mounting frame 207, the stability of the pre-folding wheel 203 during rotation can be further guaranteed. One connecting shaft 208 is installed on the mounting frame 207, and the two pre-folding wheels 203 are driven at the same time. Since the driving source is the same, the rotation speeds of the two pre-folding wheels 203 remain consistent, and the pre-folding effect on the tab 301 is also the same, thereby guaranteeing the production quality of the battery.

[0034] In addition, in order to adapt to different sizes of the battery cell pole piece, the pre-folding wheel driving shaft 205 is adjustably installed in the second through hole, and the distance between the two ends of the pre-folding wheel driving shaft 205 and the vertical rod 2072 can be adjusted. Refer to Figure 5As shown in the figure, the pre-folding wheels 203 are located on the mounting frame 207 and correspond to the position of the tabs 301 of the battery cell 3. When the tabs 301 of different sizes of battery cells 3 are pre-folded, the distance between the two pre-folding wheels 203 needs to be adjusted correspondingly to adapt to the battery cell 3, so that the two pre-folding wheels 203 are in abutment with the tabs 301 of the battery cell 3. When the tabs 301 of different sizes of battery cells 3 need to be pre-folded, the distance between the two pre-folding wheels 203 is adjusted by adjusting the position of the pre-folding wheel drive shaft 205 in the second through hole, so as to adapt to battery cells 3 of different sizes. When the width of the tabs of the battery cell 3 is larger, the distance between the two pre-folding wheels 203 is increased, and when the width of the tabs of the battery cell 3 is smaller, the distance between the two pre-folding wheels 203 is decreased, so that the pre-folding of the tabs of the battery cell 3 is carried out normally, and a plurality of sizes of the device do not need to be produced, and one device can adapt to battery cells of multiple sizes.

[0035] As another embodiment, the pre-folding mechanism 2 can also be provided in multiple, for example, three, three pre-folding mechanisms 2 are arranged side by side, driven by the driving mechanism 1, and correspondingly, three battery cells 3 are respectively installed with the three pre-folding mechanisms 2, which can simultaneously pre-fold the tabs of the three battery cells 3 in batches, improving the production efficiency.

[0036] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A cylindrical battery tab pre-folding device, characterized by: The pre-folding mechanism is installed on the driving mechanism, and the driving mechanism drives the pre-folding mechanism to approach or move away from the battery cell according to the thickness of the battery cell. The pre-folding mechanism comprises a rotating driving unit and at least one pre-folding wheel, the outer surface of the pre-folding wheel is in contact with the outer surface of the tab of the battery cell, and the rotating driving unit drives the pre-folding wheel to rotate synchronously with the battery cell. The driving mechanism comprises a first motor and a screw rod, the first motor is connected with the screw rod, and the screw rod is connected with the pre-folding mechanism.

2. The cylindrical battery tab pre-folding device of claim 1, wherein: The driving mechanism further comprises a first transmission unit, the first transmission unit comprises a first transmission wheel, a second transmission wheel and a first transmission belt, the first transmission wheel is connected with the output end of the first motor, the second transmission wheel is connected with one end of the screw rod, and the first transmission belt is sleeved on the two transmission wheels.

3. The cylindrical battery tab pre-folding device of claim 2, wherein: The pre-folding mechanism further comprises a connecting plate and a linear guide rail, the connecting plate is connected with the screw rod, a sliding groove is formed in the connecting plate, the linear guide rail is located below the connecting plate, and the connecting plate is connected with the linear guide rail through the sliding groove to enable the connecting plate to move linearly on the linear guide rail.

4. The cylindrical battery tab pre-folding device of claim 2, wherein: The pre-folding mechanism further comprises a connecting shaft, two first gears, two second gears and two pre-folding wheel driving shafts, the driving unit is connected with the connecting shaft and drives the connecting shaft to rotate, the two first gears are installed at two ends of the connecting shaft, the two second gears are engaged with the two first gears respectively, and the two ends of the pre-folding wheel driving shaft are respectively installed with the second gear and the pre-folding wheel.

5. The cylindrical battery tab pre-folding device of claim 1, wherein: The driving unit is a second motor.

6. The cylindrical battery tab pre-folding device of claim 5, wherein: The pre-folding mechanism further comprises a second transmission unit, the second transmission unit comprises a third transmission wheel, a fourth transmission wheel and a second transmission belt, the third transmission wheel is connected with the output end of the second motor, the fourth transmission wheel is connected with one end of the connecting shaft, and the second transmission belt is sleeved on the two transmission wheels.

7. The cylindrical battery tab pre-folding device of claim 6, wherein: The pre-folding mechanism further comprises a mounting bracket, the mounting bracket comprises a horizontal rod and two vertical rods, the two vertical rods are installed perpendicularly at two ends of the horizontal rod, first through holes and second through holes are respectively formed in the two vertical rods, the two ends of the connecting shaft are installed in the first through holes of the two vertical rods, the two pre-folding wheel driving shafts are respectively inserted into the second through holes of the two vertical rods, and the second gears and the pre-folding wheels are respectively located on the two sides of the vertical rods.

8. The cylindrical battery tab pre-folding device of claim 5, wherein: The pre-folding wheel driving shaft is adjustably installed in the second through hole, and the pre-folding wheel driving shaft can adjust the distance between the two ends thereof and the vertical rod.

9. The cylindrical battery tab pre-folding device of claim 8, wherein: The driving mechanism further comprises a mounting base, and the first motor and the screw rod are installed on the mounting base.

10. The cylindrical battery tab pre-folding device of claim 2, wherein: ​

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