A battery cell winding system

Abstract

The present application provides a battery cell winding system, including: a slitting mechanism, which can slit a first diaphragm to form a slit area; a winding needle, which can contact the first diaphragm and wind the first diaphragm and the second diaphragm which are stacked; wherein the outer peripheral surface of the winding needle is provided with a negative pressure suction groove, and the winding needle can absorb the first diaphragm through the negative pressure suction groove, so that the slit in the slit area opens along the negative pressure suction groove to form an opening, and absorbs the second diaphragm through the opening. In this way, a slit is first cut on the first diaphragm to form a slit area, and then the slit area of ​​the first diaphragm is absorbed by the negative pressure suction groove of the winding needle, so that the slit in the slit area is deformed and opened by the negative pressure suction force of the negative pressure suction groove to form an opening, so that the first diaphragm and the second diaphragm are stacked and attached to the outer peripheral surface of the winding needle for winding, which saves the time of deceleration and acceleration of the diaphragm in the traditional solution and greatly improves the production efficiency; the slitting method responds quickly, does not affect the diaphragm tape speed, and has no effect on the battery cell quality.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell winding, and in particular to a battery cell winding system. Background Art

[0002] In the battery manufacturing process, the winding of the battery cell is usually completed by a winder, which can stack the positive and negative electrode sheets and two layers of separators in order and wind them to form a battery cell. In the prior art, the winding action of the winder is mostly intermittent, and when the separator is cut, the speed of the material belt is zero. In a winding cycle, the acceleration and deceleration process of the material belt takes a long time, resulting in low winding efficiency.

[0003] In order to achieve continuous winding of the diaphragm, compounding or gluing is usually used to make the two layers of diaphragm stick together and be adsorbed by the winding needle at the same time. However, compounding or glue solidification takes a long time, resulting in a slow diaphragm roller cutting speed. A long time for deceleration and acceleration of the material strip is still required, and the improvement of winding efficiency is limited. Moreover, compounding or gluing affects the existing battery cell production process and there is a risk of contaminating equipment and material strips. Summary of the invention

[0004] In view of this, the present application provides a battery cell winding system, which can allow two layers of separators to be adsorbed on the surface of a winding needle for non-deceleration winding.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A battery cell winding system, comprising:

[0007] A slitting mechanism capable of slitting the first diaphragm to form a slitting area;

[0008] A winding needle capable of contacting the first diaphragm and winding the first diaphragm and the second diaphragm which are stacked;

[0009] The outer circumferential surface of the winding needle is provided with a negative pressure suction groove, and the winding needle can absorb the first diaphragm through the negative pressure suction groove, so that the slit in the slit area opens along the negative pressure suction groove to form an opening, and absorbs the second diaphragm through the opening.

[0010] Optionally include:

[0011] The diaphragm cutting mechanism is capable of cutting the first diaphragm and the second diaphragm to form a cutting position, and the cutting area is at least partially located behind the cutting position.

[0012] Optionally, the diaphragm cutting mechanism comprises:

[0013] A first roller, the outer circumference of which is provided with a cutting portion, and the first roller can rotate at a linear speed of the tape running speed of the first diaphragm, and can approach the winding needle so that the cutting portion contacts the abutment position provided on the outer circumference of the winding needle and cuts off the first diaphragm and the second diaphragm;

[0014] The second roller can rotate at a linear speed of the first diaphragm's tape-feeding speed and can approach the winding needle to press the first diaphragm; and the first roller is located downstream of the second roller.

[0015] Optionally, the diaphragm cutting mechanism comprises:

[0016] Mounting seat;

[0017] A swing arm, swingably disposed on the mounting seat;

[0018] Among them, the first roller is rotatably arranged at one end of the swing arm away from the mounting seat, and can move closer to the winding needle as the swing arm swings relative to the mounting seat; the second roller is rotatably arranged on the mounting seat, and can move closer to the winding needle as the mounting seat moves.

[0019] Optionally, the slitting mechanism comprises:

[0020] A third roller having a cutting portion disposed on its outer peripheral surface;

[0021] A fourth roller, the outer peripheral surface of which is provided with an abutment position capable of contacting the cutting portion;

[0022] Among them, the third roller and the fourth roller can both rotate with the conveying speed of the first diaphragm as the linear speed, and the rotation directions of the third roller and the fourth roller are opposite; the third roller and the fourth roller can be close to clamp on both sides of the first diaphragm and cut a slit on the first diaphragm.

[0023] Optionally, the slitting mechanism further comprises:

[0024] A dust cover, located outside the third roller and the fourth roller;

[0025] The dust collecting device is communicated with the interior of the dust cover.

[0026] Optionally, the slitting mechanism comprises a first block and a second block;

[0027] A cutting portion is provided on a side of the first block close to the second block;

[0028] The side of the second block close to the first block is provided with an abutment position capable of contacting the cutting portion;

[0029] The first block and the second block are both displaceable at the tape running speed of the first diaphragm, and the first block and the second block are close to each other so as to clamp at both sides of the first diaphragm and cut a slit in the first diaphragm.

[0030] Optionally, the slitting mechanism comprises:

[0031] A blowing hole is arranged on a side of the first block close to the second block;

[0032] An air suction hole is arranged on a side of the second block close to the first block;

[0033] A negative pressure collecting device is connected to an end of the air suction hole away from the first block.

[0034] Optionally, the abutment position is provided with an avoidance groove for the cutting portion to be embedded in.

[0035] Optionally, the cutting mechanism is configured as a laser cutting device.

[0036] Optionally, the extending direction of the slits in the slit area is consistent with the running direction of the first diaphragm, and the vacuum suction groove extends along the circumference of the winding needle;

[0037] Alternatively, the slits in the slit area are arranged in a radial shape, and the vacuum suction grooves are arranged in a circular shape.

[0038] Optionally, the winding needle is provided with a plurality of adsorption areas along the circumferential direction, and the adsorption areas include an air guide hole located inside the winding needle and a plurality of the negative pressure adsorption grooves, and the negative pressure adsorption grooves are connected to the air guide hole.

[0039] The battery cell winding system provided by the present application first cuts a slit on the first diaphragm to form a slit area, and then the slit area of ​​the first diaphragm is adsorbed by the negative pressure suction groove of the winding needle, so that the slit in the slit area is deformed and opened by the negative pressure suction force of the negative pressure suction groove to form an opening, so that the first diaphragm and the second diaphragm are stacked and attached to the outer circumferential surface of the winding needle for winding, thereby realizing continuous winding of the diaphragm without reducing the speed, saving the time of deceleration and acceleration of the diaphragm in the traditional solution, and greatly improving production efficiency; the slitting method responds quickly, does not affect the diaphragm tape running speed, and has no effect on the quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0041] Figure 1A schematic diagram of a battery cell winding system according to some embodiments;

[0042] Figure 2 A schematic diagram of a diaphragm cutting mechanism shown in some embodiments;

[0043] Figure 3 Schematic diagrams of battery cell winding systems shown in other embodiments;

[0044] Figure 4 Schematic diagrams of diaphragm cutting mechanisms shown in other embodiments;

[0045] Figure 5 A schematic diagram of a diaphragm cutting mechanism shown in some embodiments;

[0046] Figure 6 A schematic diagram of a diaphragm cut-off state shown in some embodiments;

[0047] Figure 7 for Figure 6 Schematic diagram of the state of the first diaphragm;

[0048] Figure 8 A schematic diagram of a winding needle shown for some embodiments;

[0049] Fig. 9 A cross-sectional view of a winding needle shown for some embodiments;

[0050] Fig.10 Schematic diagrams of winding needles shown in other embodiments;

[0051] Fig.11 Cross-sectional views of winding needles showing other embodiments.

[0052] 1. First pole piece; 2. First pole piece cutting device; 3. First pole piece deviation correction device; 4. Over roller; 5. Winding station; 6. Gluing device; 7. Unloading station; 8. Finishing device; 9. Diaphragm cutting mechanism; 10. Auxiliary feeding device; 11. Second diaphragm; 12. Second pole piece deviation correction device; 13. Second pole piece cutting device; 14. Second pole piece; 15. Slitting mechanism; 16. First diaphragm; 17. Winding needle; 91. Second roller; 92. Mounting seat; 93. Swing arm; 94. first roller; 95. first driving device; 151. third roller; 152. fourth roller; 153. dust cover; 154. dust suction device; 155. first block; 156. second block; 157. air blowing hole; 158. air suction hole; 159. negative pressure collecting device; 161. slitting area; 1611. opening; 162. cutting position; 171. adsorption area; 172. avoidance groove; 1711. negative pressure suction groove; 1712. air guide hole; 1713. connecting hole. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] like Figure 1-Figure 11 As shown, an embodiment of the present application provides a battery cell winding system, including a slitting mechanism 15 and a winding needle 17 .

[0055] The slitting mechanism 15 is used to cut a slit on the first diaphragm 16 to form a slit area 161 on the first diaphragm 16 . The slit in the slit area 161 penetrates the first diaphragm 16 .

[0056] The winding needle 17 is used to wind the stacked first diaphragm 16 and the second diaphragm 11 , and the first diaphragm 16 is closer to the winding needle 17 than the second diaphragm 11 , so that the first diaphragm 16 contacts the winding needle 17 during winding, and the second diaphragm 11 is located on the side of the first diaphragm 16 away from the winding needle 17 .

[0057] Moreover, a negative pressure suction groove 1711 is provided on the outer peripheral surface of the winding needle 17. When the stacked first diaphragm 16 and second diaphragm 11 are close to the winding needle 17, the first diaphragm 16 contacts the winding needle 17, and the winding needle 17 uses the negative pressure of the negative pressure suction groove 1711 to make the first diaphragm 16 fit and be adsorbed on the outer peripheral surface of the winding needle 17. At the same time, the slit of the slit area 161 is deformed by the negative pressure suction of the negative pressure suction groove 1711, so that the slit opens to form an opening 1611. Since the opening 1611 can allow air to pass through, the second diaphragm 11 stacked with the first diaphragm 16 is affected by the negative pressure of the opening 1611, and fits and is adsorbed on the outer peripheral surface of the winding needle 17 together with the first diaphragm 16, and then the first diaphragm 16 and the second diaphragm 11 are simultaneously fit and adsorbed on the outer peripheral surface of the winding needle 17, so that the first diaphragm 16 and the second diaphragm 11 are wound by the rotation of the winding needle 17, and continuous winding without speed reduction is achieved.

[0058] In this way, a slit is first cut on the first diaphragm 16 to form a slit area 161, and then the slit area 161 of the first diaphragm 16 is adsorbed by the negative pressure suction groove 1711 of the winding needle 17, so that the slit of the slit area 161 is deformed and opened by the negative pressure suction force of the negative pressure suction groove 1711 to form an opening 1611, so that the first diaphragm 16 and the second diaphragm 11 are stacked and attached to the outer peripheral surface of the winding needle 17 for winding, thereby realizing continuous winding of the diaphragm without reducing the speed, saving the time of deceleration and acceleration of the diaphragm in the traditional solution, and greatly improving production efficiency; the slitting method responds quickly, does not affect the diaphragm tape speed, and has no effect on the quality of the battery cell.

[0059] The cell winding system includes a diaphragm cutting mechanism 9, through which the first diaphragm 16 and the second diaphragm 11 can be cut to form a cutting position 162, that is, the first diaphragm 16 and the second diaphragm 11 are disconnected at the cutting position 162, and the two pole pieces of two adjacent cells can be wound respectively. The slit area 161 is at least partially located behind the cutting position 162, that is, the cutting position 162 can be located in front of the slit area 161, or in the middle of the slit area 161, so that after the diaphragm cutting mechanism 9 cuts the first diaphragm 16 and the second diaphragm 11, the first diaphragm 16 and the second diaphragm 11 can be adsorbed onto the winding needle 17 in time.

[0060] Here, the front and rear positions of the cutting position 162 and the slit area 161 are defined by the conveying direction of the first diaphragm 16. During the conveying process of the first diaphragm 16, the position of the first diaphragm 16 that reaches the winding needle 17 first is the "front", and the position that reaches the winding needle 17 later is the "back".

[0061] Furthermore, if Figure 5 As shown, the membrane cutting mechanism 9 includes a first roller 94 and a second roller 91, wherein a cutting portion is provided on the outer circumference of the first roller 94, and an abutting position is provided on the outer circumference of the winding needle 17, the cutting portion cooperates with the abutting position, and the first roller 94 can approach or move away from the winding needle 17. When the first roller 94 approaches and abuts against the winding needle 17, the cutting portion abuts against the abutting position, and the membrane located between the cutting portion and the abutting position is disconnected through the cooperation of the cutting portion and the abutting position, thereby completing the cutting of the first membrane 16 and the second membrane 11. Moreover, the first roller 94 is arranged to rotate, and the linear speed of the rotation of the first roller 94 can be consistent with the tape running speed of the first membrane 16, so that the relative position of the cutting portion on the outer circumference of the first roller 94 and the membrane is kept synchronized, and when the membrane is cut, the fluctuation of the membrane speed can be avoided.

[0062] Specifically, the cutting portion may be a blade, or may be a heating wire or other structure capable of cutting the diaphragm.

[0063] The second roller 91 can approach or move away from the winding needle 17, and the second roller 91 is arranged to rotate. The linear speed of the rotation of the second roller 91 can be consistent with the tape running speed of the first diaphragm 16. When the second roller 91 approaches and contacts the winding needle 17, the outer peripheral surface of the second roller 91 presses the first diaphragm 16 and the second diaphragm 11 against the winding needle 17, and the first roller 94 rotates synchronously with the tape running speed of the diaphragms.

[0064] Moreover, the first roller 94 is located downstream of the second roller 91, that is, when the first roller 94 and the second roller 91 are both against the winding needle 17, the first roller 94 is located downstream of the second roller 91. When the first diaphragm 16 and the second diaphragm 11 are cut by the first roller 94, the diaphragm between the first roller 94 and the second roller 91 forms a wrap angle on the surface of the winding needle 17, so that the head position adsorption of the cut diaphragm is more stable. At the same time, the rotation line speed of the first roller 94 and the second roller 91 is consistent with the tape running speed of the diaphragm. There is no tension fluctuation at the moment of diaphragm cutting, which is conducive to ensuring the smooth transmission of the diaphragm.

[0065] Here, the upstream and downstream positions of the first roller 94 and the second roller 91 are defined by the conveying direction of the first diaphragm 16. During the conveying process of the first diaphragm 16, the same position on the first diaphragm 16 first reaches the "upstream" and then reaches the downstream, wherein the first roller 94 is located downstream of the second roller 91, that is, the same position on the first diaphragm 16 first reaches the second roller 91 and then reaches the first roller 94.

[0066] In order to improve the cutting quality of the diaphragm, an avoidance groove 172 is provided at the abutment position, and the avoidance groove 172 cooperates with the cutting part so that the cutting part can be embedded in the avoidance groove. When the diaphragm is cut, the cutting part is embedded in the avoidance groove, so that the diaphragm is cut in the avoidance groove, which is beneficial to ensure the cutting quality.

[0067] In some preferred embodiments, the diaphragm cutting mechanism 9 includes a mounting seat 92 and a swing arm 93, and the swing arm 93 is swingably arranged on the mounting seat 92. The first end of the swing arm 93 is swingably connected to the mounting seat 92, and the first roller 94 is rotatably arranged on the second end of the swing arm 93, so that the first roller 94 is arranged away from the mounting seat 92, and the swing arm 93 swings relative to the mounting seat 92, so that the first roller 94 can approach the winding needle 17 until it abuts against the winding needle 17. The second roller 91 is rotatably arranged on the mounting seat 92, and the mounting seat 92 approaches the winding needle 17, so that the second roller 91 can approach the winding needle 17 until it abuts against it.

[0068] During operation, the mounting seat 92 is first displaced relative to the winding needle 17, so that the first roller 94 and the second roller 91 are both close to the winding needle 17, until the second roller 91 abuts against the winding needle 17, and the outer peripheral surface of the second roller 91 presses the diaphragm, and then the swing arm 93 swings relative to the mounting seat 92, so that the first roller 94 is close to the winding needle 17 until it abuts against the winding needle 17, so that the diaphragm is cut by the first roller 94. In this way, the first roller 94 and the second roller 91 are located on the same component and can be displaced synchronously, which effectively simplifies the structure and improves the structural stability.

[0069] Specifically, the diaphragm cutting mechanism 9 includes a first driving device 95, a second driving device and a third driving device. The first driving device 95 is used to drive the second roller 91 to rotate relative to the mounting seat 92, and the first roller 94 to rotate relative to the swing arm 93, that is, the first roller 94 and the second roller 91 rotate synchronously; the second driving device is used to drive the displacement of the mounting seat 92, so that the mounting seat 92 is close to or away from the winding needle 17, that is, the second driving device drives the mounting seat 92 to reciprocate in the direction of approaching or moving away from the winding needle 17, so that the first roller 94 and the second roller 91 are close to or away from the winding needle 17; the third driving device is used to drive the swing arm 93 to swing relative to the mounting seat 92, so that the first roller 94 is close to or away from the winding needle 17.

[0070] In some embodiments of this solution, Figure 2 As shown, the slitting mechanism 15 includes a third roller 151 and a fourth roller 152. The outer circumference of the third roller 151 is provided with a cutting portion, and the outer circumference of the fourth roller 152 is provided with an abutment position, the cutting portion cooperates with the abutment position, and the third roller 151 and the fourth roller 152 are respectively located on both sides of the first diaphragm 16 and can be relatively close to each other. When the third roller 151 and the fourth roller 152 are relatively close to each other and abut against each other, the third roller 151 and the fourth roller 152 are clamped on both sides of the first diaphragm 16, and the slitting of the first diaphragm 16 is completed through the interaction between the cutting portion and the abutment position. The third roller 151 and the fourth roller 152 are both rotatably arranged, and the rotational linear speeds of the third roller 151 and the fourth roller 152 can be consistent with the conveying speed of the first diaphragm 16, and the rotation directions of the third roller 151 and the fourth roller 152 are opposite. In this way, when the first diaphragm 16 is cut, the third roller 151 and the fourth roller 152 are in contact with each other, which will not affect the conveying speed of the first diaphragm 16, and will not cause tension fluctuations at the moment of cutting.

[0071] Specifically, the cutting portion may be a blade, or may be a heating wire or other structure capable of cutting the diaphragm.

[0072] The slitting mechanism 15 further includes a dust cover 153 and a dust suction device 154. The dust cover 153 is arranged outside the third roller 151 and the fourth roller 152 to wrap the third roller 151 and the fourth roller 152 to prevent the diffusion of cutting products or dust generated during slitting. The dust suction device 154 is connected to the inside of the dust cover 153. The dust suction device 154 can suck out and collect the cutting products or dust generated in the dust cover 153. In this way, it can prevent the cutting products or dust from interfering with the system.

[0073] In order to improve the cutting quality of the first diaphragm 16, an avoidance groove is provided at the abutment position, and the avoidance groove cooperates with the cutting part so that the cutting part can be embedded in the avoidance groove. When the first diaphragm 16 is cut, the cutting part is embedded in the avoidance groove, so that the first diaphragm 16 is located in the avoidance groove for cutting, which is beneficial to ensure the quality of the cutting.

[0074] Specifically, the slitting mechanism 15 also includes a fourth driving device, a fifth driving device and a sixth driving device. The fourth driving device is used to drive the third roller 151 to rotate so that the rotation speed of the third roller 151 can be consistent with the tape running speed of the first diaphragm 16; the fifth driving device is used to drive the fourth roller 152 to rotate so that the rotation speed of the fourth roller 152 can be consistent with the tape running speed of the first diaphragm 16; the sixth driving device is used to drive the third roller 151 and the fourth roller 152 to be relatively close to or away from each other, so that the third roller 151 and / or the fourth roller 152 reciprocate on both sides of the first diaphragm 16.

[0075] In other embodiments of this solution, Figure 4 As shown, the slitting mechanism 15 includes a first block 155 and a second block 156, which are respectively located on both sides of the first diaphragm 16 and can be close to each other so that the first block 155 and the second block 156 clamp the first diaphragm 16. A cutting portion is provided on one side of the first block 155 close to the second block 156, and an abutment position is provided on one side of the second block 156 close to the first block 155. The cutting portion cooperates with the abutment position. When the first block 155 and the second block 156 are close to and clamped on both sides of the first diaphragm 16, the slitting of the first diaphragm 16 is completed under the action of the cutting portion and the abutment position. Moreover, the first block 155 and the second block 156 can be displaced synchronously relative to the first diaphragm 16, so that the displacement speed of the first block 155 and the second block 156 is consistent with the tape running speed of the first diaphragm 16. In this way, when the first block 155 and the second block 156 are clamped on both sides of the first diaphragm 16, the first block 155, the second block 156 and the first diaphragm 16 are relatively still, and the cutting portion and the abutment position contact the cutting seam, which will not affect the tape running speed of the first diaphragm 16, and no tension fluctuation will be generated at the moment of cutting.

[0076] Specifically, the cutting portion may be a blade, or may be a heating wire or other structure capable of cutting the diaphragm.

[0077] The slitting mechanism 15 further includes a blowing hole 157, an air suction hole 158, and a negative pressure collecting device 159. The blowing hole 157 is arranged on the side of the first block 155 close to the second block 156 and extends into the first block 155 so that a blowing airflow, i.e., a positive pressure, is formed on the side of the first block 155 close to the second block 156; the air suction hole 158 is arranged on the side of the second block 156 close to the first block 155 and extends into the second block 156 so that an air suction airflow, i.e., a negative pressure, is formed on the side of the second block 156 close to the first block 155. When the first diaphragm 16 is slit, the first block 155 and the second block 156 are clamped on both sides of the first diaphragm 16, and an airflow is formed between the first block 155 and the second block 156, flowing from the first block 155 to the second block 156, so that the cutting products and dust generated by the slitting are taken away by the airflow. The negative pressure collection device 159 is connected to the end of the air suction hole 158 away from the first block 155, and the cutting products and dust brought out by the air flow are collected by the negative pressure collection device 159. In this way, the cutting products or dust can be prevented from interfering with the system.

[0078] In order to improve the cutting quality of the first diaphragm 16, an avoidance groove is provided at the abutment position, and the avoidance groove cooperates with the cutting part so that the cutting part can be embedded in the avoidance groove. When the first diaphragm 16 is cut, the cutting part is embedded in the avoidance groove, so that the first diaphragm 16 is located in the avoidance groove for cutting, which is beneficial to ensure the quality of the cutting.

[0079] Specifically, the slitting mechanism 15 also includes a seventh driving device and an eighth driving device. The seventh driving device is used to drive the first block 155 and the second block 156 to displace along the extension direction of the first diaphragm 16, so that the displacement speed of the first block 155 and the second block 156 can be consistent with the tape running speed of the first diaphragm 16; the eighth driving device is used to drive the first block 155 and the second block 156 to move closer or farther away, so that the first block 155 and / or the second block 156 are located on both sides of the first diaphragm 16 and reciprocate.

[0080] In other embodiments, the slitting mechanism is configured as a laser cutting device, and a slitting area 161 is formed on the first diaphragm 16 by laser sintering, which is convenient and quick, and helps to reduce mechanical friction. Since the laser sintering will produce material removal, the width of the laser cutting can be controlled to reduce the material removal, and the laser sintering on the first diaphragm 16 is a thin line to form a slit.

[0081] In this solution, a plurality of slits are provided in the slit area 161, and the structure and distribution of the slits can be in various forms.

[0082] For example, Figure 7As shown, the extension direction of the slit is consistent with the running direction of the first diaphragm 16, that is, the extension direction of the cutting portion on the slit mechanism 15 (even the extension direction of the avoidance groove) is consistent with the running direction of the first diaphragm 16. Correspondingly, the negative pressure suction groove 1711 on the winding needle 17 extends along the circumference of the winding needle 17. In this way, the slit corresponds to the negative pressure suction groove 1711, which is more conducive to the suction force of the negative pressure suction groove 1711 acting on the slit, making the slit easier to deform and open.

[0083] Alternatively, the extension direction of the slit is perpendicular to the running direction of the first diaphragm 16 (equivalent to being parallel to the width direction of the first diaphragm 16), that is, the extension direction of the cutting portion on the slit mechanism 15 (even the extension direction of the avoidance groove) is perpendicular to the running direction of the first diaphragm 16 (equivalent to being parallel to the width direction of the first diaphragm 16). Correspondingly, the negative pressure suction groove 1711 on the winding needle 17 extends along the axial direction of the winding needle 17. In this way, the slit corresponds to the negative pressure suction groove 1711, which is more conducive to the suction force of the negative pressure suction groove 1711 acting on the slit, making the slit easier to deform and open.

[0084] Alternatively, the slit is arranged in a radial shape, which is radially extending in three or more directions with one point as the center, that is, the cutting portion (or even the avoidance groove) on the slit mechanism 15 is arranged in a radial shape. Correspondingly, Figure 10-11 As shown, the negative pressure suction groove 1711 on the winding needle 17 is set to be circular, so that when the slit is opposite to the negative pressure suction groove 1711, the slit can be deformed and opened from the center without causing deformation to the first diaphragm 16, and the deformation and opening are easier.

[0085] Of course, the extending direction of the slit can also be inclined, which is not specifically limited here.

[0086] The cutting area 161 is provided with trimming areas on both sides of the first diaphragm 16 in the tape-running direction. The trimming areas are provided to prevent the edges of the first diaphragm 16 from warping and wrinkling.

[0087] In this scheme, if Figure 10-11As shown, the winding needle 17 has a plurality of adsorption areas 171 distributed along the circumference, and the first diaphragm 16 and the second diaphragm 11 can be attached to any position of the winding needle 17 in the circumference through the plurality of adsorption areas 171, so as to ensure adsorption stability. Among them, the adsorption area 171 includes a negative pressure suction groove 1711 and an air guide hole 1712, and the air guide hole 1712 is located inside the winding needle 17 and communicates with the negative pressure air path. There are a plurality of negative pressure suction grooves 1711, which are distributed on the outer peripheral surface of the winding needle 17, and the negative pressure suction grooves 1711 are connected with the air guide holes 1712 (specifically, the negative pressure suction grooves 1711 and the air guide holes 1712 can be connected through the connecting hole 1713), so that the negative pressure air path acts on the negative pressure air holes, and then a uniform and stable negative pressure is formed on the outer peripheral surface of the winding needle 17, which is conducive to the stable adsorption of the first diaphragm 16 and the second diaphragm 11.

[0088] The present solution is described in detail below in combination with the form of continuous winding of the diaphragm without speed reduction in the prior art. The present battery cell winding system includes a conveying mechanism and a winding mechanism. Among them, the conveying mechanism is used to convey the first pole piece 1, the second pole piece 14, the first diaphragm 16 and the second diaphragm 11. Specifically, the conveying mechanism includes a first pole piece cutting device 2, a first pole piece deviation correction device 3, a roller 4, an auxiliary sheet feeding device 10, a second pole piece cutting device 13 and a second pole piece deviation correction device 12. The first pole piece cutting device 2 and the second pole piece cutting device 13 are respectively used for the follow-up cutting and sheet feeding of the first pole piece and the second pole piece. The first pole piece deviation correction device 3 and the second pole piece deviation correction device 12 are respectively used for the deviation correction of the first pole piece and the second pole piece. The auxiliary sheet feeding device 10 is used to clamp the first pole piece 1, the first diaphragm 16, the second pole piece 14 and the second diaphragm 11 stacked in sequence and convey them to the winding mechanism. Here, the first electrode piece 1 is sequentially conveyed to the winding mechanism along the first electrode piece cutting device 2, the first electrode piece correcting device 3, the roller 4 and the auxiliary sheet feeding device 10, the second electrode piece 14 is sequentially conveyed to the winding mechanism along the second electrode piece cutting device 13, the second electrode piece correcting device 12 and the auxiliary sheet feeding device 10, the first diaphragm 16 is sequentially conveyed to the winding mechanism along the slitting mechanism 15, the roller 4 and the auxiliary sheet feeding device 10, and the second diaphragm 11 is sequentially conveyed to the winding mechanism along the auxiliary sheet feeding device 10.

[0089] The winding mechanism includes at least two winding needles 17, a glue sticking device 6 and a finishing device 8. The glue sticking device 6 is used to stop sticking glue on the battery cell at the unloading station 7, and the finishing device 8 is used to wind up the battery cell at the unloading station 7. Multiple winding needles 17 are cyclically switched between the winding station 5 and the unloading station 7, so that the winding needle 17 is moved to the winding station 5 for winding, and after the winding is completed, it is moved to the unloading station 7, and then a new winding needle 17 is moved to the winding station 5 for winding, thereby realizing continuous winding without stopping.

[0090] In this scheme, the working principle of the battery cell winding system is as follows:

[0091] When the cell winding at the winding station 5 is nearly finished, the first electrode sheet cutting device 2 and the second electrode sheet cutting device 13 accelerate from zero until they are at the same speed as the electrode sheets (i.e., the first electrode sheet 1 and the second electrode sheet 14), and cut off the electrode sheets after the preset length is reached. The electrode sheets are then fed in a process of deceleration → constant speed → acceleration → set speed, so that the cutting position of the electrode sheets and the cutting position 162 of the diaphragms (i.e., the first diaphragms 16 and the second diaphragms 11) are staggered by a set length and can be connected to the winding of the next cell at a uniform speed.

[0092] At the same time, the cutting part and the abutting position in the slitting mechanism 15 are relatively close, and slitting is performed at a preset position of the first diaphragm 16 to form a slitting area 161. After the slitting is completed, the cutting part and the abutting position are relatively far away. This time, the cutting part and the abutting position in the slitting mechanism 15 are both stationary relative to the first diaphragm 16, that is, the rotational linear speed of the third roller 151 and the fourth roller 152 is consistent with the running speed of the first diaphragm 16, or the displacement speed of the first block 155 and the second block 156 is consistent with the running speed of the first diaphragm 16.

[0093] At the same time, the winding structure performs station switching, and the winding needle 17 with the battery cell at the winding station 5 switches to the unloading station 7, and the winding needle 17 continues to rotate and perform winding work, and the empty winding needle 17 at the unloading station 7 switches to the winding station, and the winding needle 17 begins to accelerate its rotation. When the station switching action is completed, the rotation circumferential linear speed of the new winding needle 17 at the winding station 5 is consistent with the tape running speed of the diaphragm. After the winding needle 17 at the winding station 5 is wound to the preset length of the battery cell, the mounting seat 92 drives the second roller 91 to approach the winding needle 17 at the winding station 5 until the first diaphragm 16 and the second are pressed on the winding needle 17 and a certain pressing force is provided. The swing arm 93 drives the first roller 94 to swing toward the winding needle 17 located at the winding station 5, and the first roller 94 cooperates with the winding needle 17 to cut the diaphragm, forming the diaphragm head and the diaphragm tail, and the slit area 161 is located at the diaphragm head. At this time, the circumferential line speed of the first roller 94 and the second roller 91 is consistent with the tape running speed of the diaphragm, and the diaphragm between the first roller 94 and the second roller 91 forms a wrap angle on the surface of the winding needle 17, and the adsorption area 171 in the corresponding area of ​​the winding needle 17 is connected to the negative pressure air path, and the first diaphragm 16 is adsorbed by the negative pressure suction groove 1711. At the same time, under the action of the negative pressure suction groove 1711, the slit of the slit area 161 is deformed and opened to form an opening 1611, and the second diaphragm 11 is adsorbed by the negative pressure suction groove 1711 through the opening 1611 corresponding to the slit area 161, so that the first diaphragm 16 and the second diaphragm 11 are simultaneously adsorbed on the outer peripheral surface of the winding needle 17, and the diaphragm pre-winding and electrode feeding actions of the next battery cell are performed. During the membrane pre-rolling process, the negative pressure of one or more adsorption zones 171 may be selectively turned on.

[0094] The tail of the cut diaphragm is finished by the winding needle 17 located at the unloading station 7. The unloading station 7 is sequentially finished by the winding device 8 pressing the battery cell, the gluing device 6 glues the battery cell, and finally the unloading mechanism removes the battery cell from the winding needle 17. During the process of removing the battery cell, each adsorption area 171 can be selectively connected to positive pressure to reduce the friction of removing the battery cell.

[0095] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0096] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0097] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0098] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0099] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0100] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery cell winding system, characterized in that: include: A slitting mechanism, comprising a cutting portion and an abutting position, wherein the cutting portion and the abutting position cooperate to cut a slit on the first diaphragm to form a slitting area; A winding needle capable of contacting the first diaphragm and winding the first diaphragm and the second diaphragm which are stacked; Among them, the outer circumferential surface of the winding needle is provided with a negative pressure suction groove. When the stacked first diaphragm and the second diaphragm are close to the winding needle, the first diaphragm contacts the winding needle, and the winding needle can absorb the first diaphragm through the negative pressure suction groove, so that the first diaphragm is adhered and adsorbed on the outer circumferential surface of the winding needle. At the same time, the slit in the slit area is deformed by the negative pressure suction force of the negative pressure suction groove, so that the slit in the slit area opens along the negative pressure suction groove to form an opening for airflow to pass through, and absorbs the second diaphragm through the opening, so that the first diaphragm and the second diaphragm are adhered and adsorbed on the outer circumferential surface of the winding needle at the same time.

2. The battery core winding system according to claim 1, characterized in that: include: The diaphragm cutting mechanism is capable of cutting the first diaphragm and the second diaphragm to form a cutting position, and the cutting area is at least partially located behind the cutting position.

3. The battery core winding system according to claim 2, characterized in that: The diaphragm cutting mechanism comprises: A first roller, the outer circumference of which is provided with a cutting portion, and the first roller can rotate at a linear speed of the tape running speed of the first diaphragm, and can approach the winding needle so that the cutting portion contacts the abutment position provided on the outer circumference of the winding needle and cuts off the first diaphragm and the second diaphragm; The second roller can rotate at a linear speed of the first diaphragm's tape-feeding speed and can approach the winding needle to press the first diaphragm; and the first roller is located downstream of the second roller.

4. The battery core winding system according to claim 3, characterized in that: The diaphragm cutting mechanism comprises: Mounting seat; A swing arm, swingably disposed on the mounting seat; Among them, the first roller is rotatably arranged at one end of the swing arm away from the mounting seat, and can move closer to the winding needle as the swing arm swings relative to the mounting seat; the second roller is rotatably arranged on the mounting seat, and can move closer to the winding needle as the mounting seat moves.

5. The battery cell winding system according to claim 1, characterized in that: The slitting mechanism comprises: A third roller having a cutting portion disposed on its outer peripheral surface; A fourth roller, the outer peripheral surface of which is provided with an abutment position capable of contacting the cutting portion; Among them, the third roller and the fourth roller can both rotate with the conveying speed of the first diaphragm as the linear speed, and the rotation directions of the third roller and the fourth roller are opposite; the third roller and the fourth roller can be close to clamp on both sides of the first diaphragm and cut a slit on the first diaphragm.

6. The battery cell winding system according to claim 5, characterized in that: The slitting mechanism also includes: A dust cover, located outside the third roller and the fourth roller; The dust collecting device is communicated with the interior of the dust cover.

7. The battery cell winding system according to claim 1, characterized in that: The slitting mechanism comprises a first block and a second block; A cutting portion is provided on a side of the first block close to the second block; The side of the second block close to the first block is provided with an abutment position capable of contacting the cutting portion; The first block and the second block are both displaceable at the tape running speed of the first diaphragm, and the first block and the second block are close to each other so as to clamp at both sides of the first diaphragm and cut a slit in the first diaphragm.

8. The battery cell winding system according to claim 7, characterized in that: The slitting mechanism comprises: A blowing hole is arranged on a side of the first block close to the second block; An air suction hole is arranged on a side of the second block close to the first block; A negative pressure collecting device is connected to an end of the air suction hole away from the first block.

9. The battery core winding system according to claim 3, 5 or 7, characterized in that: The abutting position is provided with an avoidance groove for the cutting portion to be embedded in.

10. The battery cell winding system according to claim 1, characterized in that: The cutting mechanism is configured as a laser cutting device.

11. The battery core winding system according to claim 1, characterized in that: The extending direction of the slits in the slit area is consistent with the running direction of the first diaphragm, and the negative pressure suction groove extends along the circumferential direction of the winding needle; Alternatively, the extending direction of the slits in the slit area is perpendicular to the running direction of the first diaphragm, and the negative pressure suction groove extends along the axial direction of the winding needle; Alternatively, the slits in the slit area are arranged in a radial shape, and the negative pressure suction grooves are arranged in a circular shape.

12. The battery core winding system according to claim 1, characterized in that: The winding needle is provided with a plurality of adsorption areas along the circumferential direction. The adsorption areas include an air guide hole located inside the winding needle and a plurality of negative pressure adsorption grooves. The negative pressure adsorption grooves are connected with the air guide hole.

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