Laminated battery cell production device and use method thereof

Abstract

The present invention belongs to the technical field of battery production, and discloses a laminated battery cell production device and its use method. The laminated battery cell production device includes a negative electrode conveying mechanism, two unwinding rollers, two positive electrode conveying mechanisms, a first identification member, a second identification member, a cutter, a winding needle, and two first hot composite rollers. The unwinding roller is configured to unwind the diaphragm downstream, and a residual detection member is provided outside the unwinding roller. The residual detection member is used to detect the length of the remaining diaphragm on the unwinding roller. The negative electrode conveying mechanism can convey the negative electrode sheet between the two diaphragms at intervals, and the residual detection member is communicated with the negative electrode conveying mechanism; the positive electrode conveying mechanism is configured to place the positive electrode sheet on the side of the corresponding diaphragm away from the negative electrode sheet; a first identification member is provided between the positive electrode conveying mechanism and the unwinding roller; a material splicing member is located downstream of the cutter, and the material strip hot-compounded with the positive electrode sheet is stacked in the material splicing member. The laminated battery cell production device and its use method can avoid overfeeding negative and positive electrode sheets onto the diaphragm, saving materials.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and in particular to a laminated battery cell production device and a method for using the same. Background Art

[0002] The battery cell is made by the stacking method, in which the negative electrode sheet, positive electrode sheet and separator are the core components. After stacking, the positive electrode sheet and negative electrode sheet are alternately stacked in the battery cell, and the adjacent electrode sheets are separated by a separator. During production, the separator is used as the basis.

[0003] Since the production of a core pack requires 30-40 meters of diaphragm, one roll of diaphragm cannot be just enough to produce the last complete battery cell. During the production process, it is not discovered in time that the subsequent diaphragm length is insufficient. After a period of continuous production, it is found that the length is insufficient. However, at this time, multiple positive and negative electrode sheets have been thermally composited onto the diaphragm, resulting in this part of the raw materials being unable to form a complete battery cell, causing waste of positive and negative electrode raw materials.

[0004] Therefore, there is an urgent need to design a laminated battery cell production device and a method of using the same to solve the above problems. Summary of the Invention

[0005] One purpose of the present invention is to provide a laminated battery cell production device that can promptly detect that the subsequent diaphragm is insufficient to produce a complete battery cell, avoid the situation of feeding too many negative and positive plates onto the diaphragm, and avoid waste of raw materials.

[0006] Another object of the present invention is to provide a method for using a laminated battery cell production device, which can promptly detect that the subsequent diaphragm is insufficient to produce a complete battery cell, avoid the situation of feeding too many negative and positive plates onto the diaphragm, and avoid waste of raw materials.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The laminated battery cell production device includes:

[0009] A negative electrode conveying mechanism and two unwinding rollers, the two unwinding rollers are respectively located on both sides of the negative electrode conveying mechanism, the unwinding rollers are configured to unwind the separator downstream, each unwinding roller is provided with a remaining amount detection member, the remaining amount detection member is used to detect the length of the separator remaining on the unwinding roller, the negative electrode conveying mechanism is configured to convey the negative electrode sheet at different intervals between the two separators, so as to convey the material strip downstream together with the two separators, and the remaining amount detection member is communicatively connected to the negative electrode conveying mechanism;

[0010] Two positive electrode conveying mechanisms are located downstream of the two unwinding rollers in a one-to-one correspondence, the positive electrode conveying mechanisms being configured to place the positive electrode sheet on the side of the corresponding separator facing away from the negative electrode sheet, with the positive electrode sheets placed by the two positive electrode conveying mechanisms being arranged alternately;

[0011] A first identification member is provided between the positive electrode conveying mechanism and the corresponding unwinding roller on at least one side, the first identification member being configured to identify the engagement position of the unwinding roller and to communicate with the negative electrode conveying mechanism and the positive electrode conveying mechanism;

[0012] Two first hot composite rollers, respectively located on both sides of the material strip and configured to heat the material strip;

[0013] a second identification member located downstream of the first thermal lamination roller and configured to identify a gap between the two negative electrode sheets;

[0014] A cutter and a winding needle are located downstream of the second identification member, the cutter is in communication with the second identification member and can cut the material strip, the winding needle can clamp the material strip and rotate, and the winding needle can change its upstream and downstream position relative to the cutter;

[0015] The material connection piece is located downstream of the cutter, and the material strips thermally compounded with the positive electrode sheets are stacked in the material connection piece.

[0016] As an optional solution, the first identification element is a color code sensor, and the two rolls of the diaphragm on the same unwinding roller are connected by a diaphragm joint tape, and the color of the diaphragm joint tape is different from the color of the diaphragm.

[0017] As an optional solution, the negative electrode transport mechanism includes:

[0018] a negative electrode unwinding roller configured to release a continuous negative electrode material strip;

[0019] a negative electrode encoding roller, located downstream of the negative electrode unwinding roller and configured to print a negative electrode code on the negative electrode material strip;

[0020] a negative electrode scanning camera, located downstream of the negative electrode encoding roller and configured to identify the negative electrode encoding and defects of the negative electrode strip;

[0021] A negative electrode cutting piece, located downstream of the negative electrode scanning camera and configured to cut the continuous negative electrode material strip into individual negative electrode sheets;

[0022] a first feeding roller, located downstream of the negative electrode cutting piece and configured to sequentially convey the negative electrode sheets downstream;

[0023] The first waste rejection component is located downstream of the above-mentioned first feed roller. The above-mentioned first waste rejection component includes a first material blocking member and a first material collecting member. The above-mentioned first material blocking member is communicated with the above-mentioned negative electrode scanning camera and can be switched between a first position and a second position. The above-mentioned first material blocking member in the above-mentioned first position allows the above-mentioned negative electrode sheet to be transported between the two above-mentioned diaphragms. The above-mentioned first material blocking member in the above-mentioned second position blocks the above-mentioned negative electrode sheet and forces the above-mentioned negative electrode sheet to enter the above-mentioned first material collecting member.

[0024] As an optional solution, the above-mentioned first waste rejection component also includes a first frame and a first rotating drive member installed on the above-mentioned first frame. The above-mentioned first material blocking member is plate-shaped and connected to the output end of the above-mentioned first rotating drive member. The above-mentioned first rotating drive member can drive the above-mentioned first material blocking member to rotate and switch between the above-mentioned first position and the above-mentioned second position.

[0025] As an optional solution, the positive electrode transport mechanism includes:

[0026] a positive electrode unwinding roller configured to release a continuous positive electrode material strip;

[0027] a positive electrode encoding roller, located downstream of the positive electrode unwinding roller and configured to print a positive electrode code on the positive electrode material strip;

[0028] a positive electrode scanning camera, located downstream of the positive electrode encoding roller and configured to identify the positive electrode encoding and defects of the positive electrode strip;

[0029] A positive electrode cutting unit, located downstream of the positive electrode scanning camera and configured to cut the continuous positive electrode material strip into individual positive electrode sheets;

[0030] a second feeding roller, located downstream of the positive electrode cutting piece and configured to sequentially convey the positive electrode sheets downstream;

[0031] The second waste rejection component is located downstream of the above-mentioned second feed roller. The above-mentioned second waste rejection component includes a second material blocking member and a second material collecting member. The above-mentioned second material blocking member is communicated with the above-mentioned positive electrode scanning camera and can be switched between a third position and a fourth position. The above-mentioned second material blocking member in the above-mentioned third position allows the above-mentioned positive electrode sheet to be placed on the above-mentioned diaphragm. The above-mentioned second material blocking member in the above-mentioned fourth position blocks the above-mentioned positive electrode sheet and forces the above-mentioned positive electrode sheet to enter the above-mentioned second material collecting member.

[0032] As an optional solution, the above-mentioned second waste rejection component also includes a second frame and a second rotating drive member installed on the above-mentioned second frame. The above-mentioned second blocking member is plate-shaped and connected to the output end of the above-mentioned second rotating drive member. The above-mentioned second rotating drive member can drive the above-mentioned second blocking member to rotate and switch between the above-mentioned third position and the above-mentioned fourth position.

[0033] As an optional solution, two second hot composite rollers are provided upstream of the positive electrode conveying mechanism, and the two second hot composite rollers are configured to thermally composite the two separators and the negative electrode sheet.

[0034] As an optional solution, a first drive roller is provided upstream of the above-mentioned cutter, and a second drive roller is provided downstream of the above-mentioned cutter. The above-mentioned winding needle can stay between the above-mentioned cutter and the above-mentioned first drive roller or between the above-mentioned cutter and the above-mentioned second drive roller.

[0035] A method for using a laminated battery cell production device is applied to the above-mentioned laminated battery cell production device, and the method for using the above-mentioned laminated battery cell production device includes:

[0036] S10: The remaining amount detecting member detects the remaining length of the diaphragm on the unwinding roller;

[0037] S20: Determine whether the remaining length of the diaphragm is sufficient for use of one battery cell. If yes, execute S30; if no, execute S40;

[0038] S30: Normal production of battery cells;

[0039] S40: After the negative electrode conveying mechanism conveys enough negative electrode sheets for one battery cell, and then conveys another negative electrode sheet at a second interval, both the negative electrode conveying mechanism and the positive electrode conveying mechanism stop conveying;

[0040] S50: The entire machine is stopped, and the two unwinding rollers are replaced, so that the two rolls of the diaphragm before and after the roll replacement are connected to form the joint position;

[0041] S60: discarding the material strip from the negative electrode sheet that is spaced apart from the previous negative electrode sheet by the second interval to the bonding position;

[0042] S70: Continue producing battery cells and repeat S10.

[0043] As an optional solution, the above S60 includes:

[0044] S61: The second identification component identifies the second gap between the two negative electrode sheets, indicating that the production of the previous battery cell is completed;

[0045] S62: The winding needle clamps the material strip, and the cutter receives information from the second identification element. After the last negative electrode sheet of the previous battery cell passes through the cutter, the cutter cuts the second interval;

[0046] S63: The winding needle clamps the cut material strip and moves to the downstream of the cutter to start winding the waste material;

[0047] S64: After the first identification member identifies the bonding position, the battery cell is produced normally and the second gap is formed behind the bonding position;

[0048] S65: the second recognition member recognizes the second gap behind the engagement position;

[0049] S66: The cutter receives the information of the second identification element and cuts the material strip at the second interval behind the joining position;

[0050] S67: The coiling needle retracts, the operator removes the waste material, and the coiling needle returns to the upstream of the cutter.

[0051] The beneficial effects of the present invention are:

[0052] The present invention provides a laminated battery cell production device, which conveys negative electrode sheets between two diaphragms through a negative electrode conveying mechanism. During normal production, when the negative electrode conveying mechanism conveys negative electrode sheets, the spacing between two adjacent negative electrode sheets is a first spacing. The two positive electrode conveying mechanisms alternately place positive electrode sheets on the side of the diaphragm away from the negative electrode sheets at the downstream, and the material strips are thermally composited together by a first hot composite roller, and the material strips are stacked in a material connection piece to form a battery cell; when the remaining diaphragm on the unwinding roller (the diaphragms on the two unwinding rollers are discharged synchronously, and the diaphragm residues are the same) is insufficient to produce a complete battery cell, the residue detection piece sends a signal, and the negative electrode conveying mechanism and the positive electrode conveying mechanism continue to convey the negative electrode sheets and the positive electrode sheets until the negative electrode conveying mechanism conveys a complete battery cell 210 negative electrode sheet, and then conveys another negative electrode sheet arranged at a second spacing with the front negative electrode sheet, the whole machine is shut down, and the two unwinding rollers are spliced ​​to form a diaphragm splice at the connection position of the new and old diaphragms. At this time, the unwinding roller is running, and the negative electrode conveying mechanism When the second interval downstream of the diaphragm joint belt passes the second identification component, the winding needle clamps the material strip, and the cutter cuts the second interval. The winding needle moves to the downstream of the cutter and starts winding the waste rejection range. When the second interval upstream of the diaphragm joint belt passes the second identification component, and after a preset time, the cutter cuts the second interval, and the winding needle takes away the waste rejection range. After the waste rejection range is taken away, the winding needle is reset to the upstream of the cutter, and then a new battery cell can be stacked. Therefore, the stacked battery cell production device can timely discover when the subsequent diaphragm is insufficient, stop the machine to replace the diaphragm, and remove the position with the diaphragm joint belt to avoid the situation of feeding too many negative and positive electrodes onto the diaphragm, thereby avoiding waste of raw materials.

[0053] The present invention also provides a method for using a laminated battery cell production device. By setting a residual detection component, the residual amount of the diaphragm on the unwinding tube is monitored at any time. When the residual amount is less than that required for one battery cell, after the positive and negative electrode sheets of the previous battery cell are conveyed, one more negative electrode sheet is conveyed. When the waste is subsequently rejected, the negative electrode sheet is used as an identification mark for rejection, thereby avoiding the situation of sending too many negative and positive electrode sheets onto the diaphragm and avoiding waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Schematic diagram of the structure of a laminated battery cell production device provided by an embodiment of the present invention;

[0055] Figure 2 This is a structural diagram of the normal production and waste rejection process of the material strip provided by an embodiment of the present invention;

[0056] Figure 3 This is a flow chart of a method for using the laminated battery cell production device provided by an embodiment of the present invention;

[0057] Figure 4 is a flowchart of the detailed steps of S60 provided in an embodiment of the present invention;

[0058] Figure 5 This is a first state diagram of the strip production provided by an embodiment of the present invention;

[0059] Figure 6 This is a second state diagram of the strip production provided by an embodiment of the present invention;

[0060] Figure 7 This is a third state diagram of the strip production provided by an embodiment of the present invention;

[0061] Figure 8 This is a fourth state diagram of the strip production provided by an embodiment of the present invention;

[0062] Figure 9 This is the fifth state diagram of the material strip production provided by the embodiment of the present invention.

[0063] In the picture:

[0064] 10. Negative electrode conveying mechanism; 11. Negative electrode unwinding roller; 12. Negative electrode material strip; 13. Negative electrode encoding roller; 14. Negative electrode scanning camera; 15. Negative electrode cutting member; 16. First feeding roller; 17. First waste rejection assembly; 171. First material stopper; 172. First material collection member; 18. Negative electrode sheet;

[0065] 20. Unwinding roller; 21. Diaphragm; 211. Second interval; 212. First interval; 213. Waste rejection range; 22. Diaphragm splicing;

[0066] 30. Residual detection parts;

[0067] 40. Positive electrode conveying mechanism; 41. Positive electrode unwinding roller; 42. Positive electrode material strip; 43. Positive electrode encoding roller; 44. Positive electrode scanning camera; 45. Positive electrode cutting unit; 46. Second feed roller; 47. Second waste rejection assembly; 471. Second material stopper; 472. Second material collection unit; 48. Positive electrode sheet;

[0068] 51. First identification element; 52. Second identification element;

[0069] 61. First hot composite roller; 62. Second hot composite roller; 63. First driving roller; 64. Second driving roller;

[0070] 70. Cutter; 80. Winding needle; 90. Material splicer; 200. Stacking mechanism; 210. Complete battery cell. DETAILED DESCRIPTION

[0071] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0072] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0073] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0074] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0075] This embodiment provides a laminated battery cell production device that can promptly detect that the subsequent diaphragm 21 is insufficient to produce a complete battery cell 210, thereby avoiding the situation where too many negative electrode sheets 18 and positive electrode sheets 48 are fed onto the diaphragm 21, thereby avoiding the waste of raw materials. Figure 1 As shown, the laminated battery cell production device includes a negative electrode conveying mechanism 10, two unwinding rollers 20, two positive electrode conveying mechanisms 40, a first identification member 51, a second identification member 52, a cutter 70, a winding needle 80, and two first hot composite rollers 61. The two unwinding rollers 20 are respectively located on both sides of the negative electrode conveying mechanism 10. The unwinding rollers 20 are configured to unwind the separator 21 downstream. A residual detection member 30 is provided outside each unwinding roller 20. The residual detection member 30 is used to detect the length of the remaining separator 21 on the unwinding roller 20. The negative electrode conveying mechanism 10 is configured to convey the negative electrode sheet 18 between the two separators 21 at different intervals, so as to convey the material strip downstream together with the two separators 21. The residual detection member 30 is communicated with the negative electrode conveying mechanism 10; the two positive electrode conveying mechanisms 40 are located one-to-one downstream of the two unwinding rollers 20, and the positive electrode conveying mechanism 40 is configured to move away from the negative electrode sheet 1 toward the corresponding separator 21. A positive electrode sheet 48 is placed on one side of 8, and the positive electrode sheets 48 placed by the two positive electrode conveying mechanisms 40 are arranged alternately; a first identification member 51 is provided between the positive electrode conveying mechanism 40 on at least one side and the corresponding unwinding roller 20, and the first identification member 51 is configured to identify the engagement position of the unwinding roller 20 and communicate with the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40; the two first hot composite rollers 61 are respectively located on both sides of the material strip and are configured to heat the material strip; the second identification member 52 is located downstream of the first hot composite roller 61 and is configured to identify the gap between the two negative electrode sheets 18; the cutter 70 and the winding needle 80 are located downstream of the second identification member 52, the cutter 70 is communicated with the second identification member 52 and can cut the material strip, the winding needle 80 can clamp the material strip and rotate, and the winding needle 80 can change the upstream and downstream positions relative to the cutter 70; the material connecting member 90 is located downstream of the cutter 70, and the material strip thermally composited with the positive electrode sheet 48 is stacked in the material connecting member 90.

[0076] The above-mentioned laminated battery production device also refers to Figure 2, the negative electrode sheet 18 is conveyed between the two separators 21 by the negative electrode conveying mechanism 10. During normal production, when the negative electrode conveying mechanism 10 conveys the negative electrode sheet 18, the distance between the two adjacent negative electrode sheets 18 is the first interval 212. The two positive electrode conveying mechanisms 40 alternately place the positive electrode sheets 48 on the side of the separator 21 away from the negative electrode sheet 18 at the downstream. The material strips are thermally composited together by the first hot composite roller 61, and the material strips are stacked in the material receiving member 90 to form a battery cell; when the remaining diaphragm 21 on the unwinding roller 20 (the diaphragms 21 on the two unwinding rollers 20 are unwound synchronously, and the remaining diaphragms 21 are the same) is insufficient for production When a complete battery cell is formed, the residual detection part 30 sends a signal, and the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 continue to convey the negative electrode sheet 18 and the positive electrode sheet 48 until the negative electrode conveying mechanism 10 conveys a complete battery cell negative electrode sheet 18, and then conveys another negative electrode sheet 18 which is arranged at a second interval 211 with the front negative electrode sheet 18, and the whole machine is shut down, and the two unwinding rollers 20 are connected to form a diaphragm joint 22 at the connection position of the new and old diaphragms 21. At this time, the unwinding roller 20 is running, and the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 are not feeding. When the diaphragm When the connecting tape 22 passes the first identification member 51, the first identification member 51 issues an instruction, and the negative electrode conveying mechanism 10 starts to convey the negative electrode sheet 18. The first negative electrode sheet 18 and the second negative electrode sheet 18 conveyed are arranged at the second interval 211, and the subsequent adjacent multiple negative electrode sheets 18 are arranged at the first interval 212. When the second interval 211 downstream of the diaphragm connecting tape 22 passes the second identification member 52, the winding needle 80 clamps the material tape, and the cutter 70 cuts the second interval 211. The winding needle 80 moves to the downstream of the cutter 70 and starts to wind the waste rejection range 213. When the second interval 211 upstream of the diaphragm connecting tape 22 passes the second identification member 52, the winding needle 80 clamps the material tape, and the cutter 70 cuts the second interval 211. The winding needle 80 moves to the downstream of the cutter 70 and starts to wind the waste rejection range 213. When the second interval 211 passes the second identification part 52, after a preset time, the cutter 70 cuts off the second interval 211, and the winding needle 80 takes away the waste range 213. After taking away the waste range 213, the winding needle 80 is reset to the upstream of the cutter 70, and then a new battery cell is stacked. Therefore, when the subsequent diaphragm 21 is insufficient, the stacked battery cell production device can promptly discover it, stop the machine to replace the diaphragm 21, and remove the position with the diaphragm connecting tape 22, so as to avoid the situation of sending too many negative electrodes 18 and positive electrodes 48 to the diaphragm 21, thereby avoiding waste of raw materials.

[0077] Optionally, the remaining quantity detecting member 30 determines the amount of the remaining diaphragm 21 by detecting the thickness of the diaphragm 21 on the unwinding roller 20. In other embodiments, the remaining quantity detecting member 30 may also obtain the amount of the remaining diaphragm 21 by other means, which are not limited here.

[0078] Optionally, among the multiple negative electrode sheets 18 in the same battery cell, the distance between adjacent negative electrode sheets 18 is X1 (i.e., the first distance 212), and the distance between the last negative electrode sheet 18 of the previous battery cell and the first negative electrode sheet 18 of the next battery cell is X2 (i.e., the second distance 211), where X2>X1. Since the distance between two adjacent negative electrode sheets 18 in a battery cell is already small enough, setting X2>X1 makes the second identification member 52 easier to identify.

[0079] Optionally, the first identification element 51 is a color code sensor, and the color of the diaphragm connecting strip 22 is different from the color of the diaphragm 21. With the above configuration, the first identification element 51 can easily identify the diaphragm connecting strip 22 by simply setting the color of the diaphragm connecting strip 22 to be different from the color of the diaphragm 21.

[0080] Alternatively, as Figure 1 As shown, the negative electrode conveying mechanism 10 includes a negative electrode unwinding roller 11, a negative electrode encoding roller 13, a negative electrode scanning camera 14, a negative electrode cutting piece 15, a first feeding roller 16 and a first waste rejection component 17. The negative electrode unwinding roller 11 is configured to release a continuous negative electrode material strip 12; the negative electrode encoding roller 13 is located downstream of the negative electrode unwinding roller 11 and is configured to print a negative electrode code on the negative electrode material strip 12; the negative electrode scanning camera 14 is located downstream of the negative electrode encoding roller 13 and is configured to identify the negative electrode code and the defects of the negative electrode material strip 12; the negative electrode cutting piece 15 is located downstream of the negative electrode scanning camera 14 and is configured to cut the continuous negative electrode material strip 12 into individual negative electrode sheet 18; the first feeding roller 16 is located downstream of the negative electrode cutting piece 15 and is configured to transport the negative electrode sheet 18 downstream in sequence; the first waste rejection component 17 is located downstream of the first feeding roller 16, and the first waste rejection component 17 includes a first material blocking member 171 and a first material collecting member 172, the first material blocking member 171 is communicated with the negative electrode scanning camera 14, and can be switched between a first position and a second position. The first material blocking member 171 at the first position allows the negative electrode sheet 18 to enter and be transported between the two diaphragms 21. The first material blocking member 171 at the second position blocks the negative electrode sheet 18 and forces the negative electrode sheet 18 to enter the first material collecting member 172. Through the above-mentioned setting, the negative electrode encoding roller 13 can count the number of negative electrode sheets 18 output. For example, a battery cell requires the negative electrode conveying mechanism 10 to output N negative electrode sheets 18. The number N is counted by the negative electrode encoding roller 13. When there is a defect, the corresponding negative electrode sheet 18 will enter the first blocking member 171 and will not flow downstream, thereby avoiding the defective negative electrode sheet 18 from being made into battery cells and affecting the battery cell performance. When counting, the negative electrode encoding roller 13 will subtract the number of negative electrode sheets 18 entering the first blocking member 171 to ensure that the number of negative electrode sheets 18 finally made into battery cells output by the negative electrode conveying mechanism 10 to the downstream is correct.

[0081] It should be noted that the negative electrode cutting piece 15 is only used to illustrate the cutting position. This structure is a prior art and will not be described in detail here.

[0082] Optionally, the first reject assembly 17 further includes a first frame (not shown) and a first rotating drive member (not shown) mounted on the first frame. The first stopper 171 is plate-shaped and connected to the output end of the first rotating drive member. The first rotating drive member can drive the first stopper 171 to rotate and switch between a first position and a second position. Through this arrangement, the first rotating drive member drives the first stopper 171 to rotate, thereby switching the first stopper 171 between the first position and the second position. The first rotating drive member can be a servo motor.

[0083] Optionally, the positive electrode conveying mechanism 40 includes a positive electrode unwinding roller 41, a positive electrode encoding roller 43, a positive electrode scanning camera 44, a positive electrode cutting piece 45, a second feeding roller 46 and a second waste rejection component 47, the positive electrode unwinding roller 41 is configured to release a continuous positive electrode material strip 42; the positive electrode encoding roller 43 is located downstream of the positive electrode unwinding roller 41 and is configured to print a positive electrode code on the positive electrode material strip 42; the positive electrode scanning camera 44 is located downstream of the positive electrode encoding roller 43 and is configured to identify the positive electrode code and the defects of the positive electrode material strip 42; the positive electrode cutting piece 45 is located downstream of the positive electrode scanning camera 44 and is configured to cut the continuous positive electrode material strip 42 into Cut into individual positive electrode sheets 48; the second feed roller 46 is located downstream of the positive electrode cutting piece 45 and is configured to transport the positive electrode sheets 48 downstream in sequence; the second waste rejection component 47 is located downstream of the second feed roller 46, and the second waste rejection component 47 includes a second blocking member 471 and a second collecting member 472, the second blocking member 471 is communicated with the positive electrode scanning camera 44, and can be switched between a third position and a fourth position, the second blocking member 471 in the third position allows the positive electrode sheet 48 to be placed on the diaphragm 21, and the second blocking member 471 in the fourth position blocks the positive electrode sheet 48 and forces the positive electrode sheet 48 to enter the second collecting member 472. Through the above-mentioned setting, the positive electrode encoding roller 43 can count the number of positive electrode sheets 48 output. For example, a battery cell requires the positive electrode conveying mechanism 40 to output M positive electrode sheets 48. The number of M is counted by the positive electrode encoding roller 43. When there is a defect, the corresponding positive electrode sheet 48 will enter the second blocking member 471 instead of flowing downstream, thereby avoiding the defective positive electrode sheets 48 from being made into battery cells and affecting the battery cell performance. When counting, the positive electrode encoding roller 43 will exclude the number of positive electrode sheets 48 entering the second blocking member 471 to ensure that the number of positive electrode sheets 48 output by the positive electrode conveying mechanism 40 to the downstream that are finally made into battery cells is correct.

[0084] Optionally, the second reject assembly 47 further includes a second frame and a second rotary drive mounted on the second frame. The second stopper 471 is plate-shaped and connected to the output end of the second rotary drive. The second rotary drive can drive the second stopper 471 to rotate and switch between a third position and a fourth position. With this arrangement, the second rotary drive drives the second stopper 471 to rotate, thereby switching the second stopper 471 between the third and fourth positions. The second rotary drive can be a servo motor.

[0085] Alternatively, as Figure 1 As shown, two second hot laminating rollers 62 are provided upstream of the positive electrode conveying mechanism 40. The two second hot laminating rollers 62 are configured to thermally laminate the two separators 21 and the negative electrode sheet 18. Through the above arrangement, the second hot laminating rollers 62 first thermally laminate the two separators 21 and the negative electrode sheet 18 located between the two separators 21. As the material belt moves downstream, the first hot laminating rollers 61 thermally laminate the additional positive electrode sheet 48. As a result, each sheet is fully thermally laminated, preventing insufficient thermal lamination of the sheet by only one hot laminating roller.

[0086] Optionally, a first drive roller 63 is provided upstream of the cutter 70, and a second drive roller 64 is provided downstream of the cutter 70. The winding needle 80 can reside between the cutter 70 and the first drive roller 63, or between the cutter 70 and the second drive roller 64. Through the above arrangement, the two drive rollers provide driving force for the material strip, preventing the material strip from slipping during operation. At the same time, the first drive roller 63 is provided before the cutter 70, ensuring that the material strip is taut and easy to cut when the cutter 70 cuts the material strip. The second drive roller 64 is provided before the material splicer 90, ensuring that the material strip enters the material splicer 90 smoothly.

[0087] The battery cells in the material connection piece 90 are formed by stacking the material strips by the stacking mechanism 200. This part is the existing technology and will not be described in detail here.

[0088] This embodiment also provides a method for using the laminated battery cell production device, which is applied to the laminated battery cell production device, such as Figure 3 As shown, the method for using the laminated battery cell production device includes:

[0089] S10: The remaining amount detection member 30 detects the length of the remaining diaphragm 21 on the unwinding roller 20;

[0090] S20: Determine whether the length of the remaining diaphragm 21 is sufficient for the usage of one battery cell. If yes, execute S30; if no, execute S40;

[0091] S30: The battery cell is producing normally. The status of the entire laminated battery cell production device can be found in Figure 5 ;

[0092] S40: After the negative electrode conveying mechanism 10 conveys enough negative electrode sheets 18 for one battery cell, it conveys another negative electrode sheet 18 at the second interval 211, and both the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 stop conveying;

[0093] S50: The whole machine is stopped, and the two unwinding rollers 20 are changed, and a joint position is formed between the two rolls of diaphragm 21 before and after the change; the process of S40 and S50 is referred to Figure 6 ;

[0094] S60: discarding the negative electrode sheet 18 that is spaced apart from the previous negative electrode sheet 18 by a second interval 211 and the material strip at the joint position;

[0095] S70: Continue producing battery cells and repeat S10.

[0096] The method of using the above-mentioned laminated battery cell production device is to set a residual detection part 30 to monitor the residual amount of the diaphragm 21 on the unwinding roller 20 at any time. When the residual amount is less than that required for one battery cell, after the positive electrode sheet 48 and the negative electrode sheet 18 of the previous battery cell are conveyed, one more negative electrode sheet 18 is conveyed. When the waste is subsequently rejected, the negative electrode sheet 18 is used as an identification mark for rejection, so as to avoid the situation of sending too many negative electrode sheets 18 and positive electrode sheets 48 onto the diaphragm 21 and avoid waste of raw materials.

[0097] Optionally, in S30, normal production of the battery cell means that the negative electrode conveying mechanism 10 conveys the negative electrode sheet 18 between the two diaphragms 21 at the second interval 211, and then conveys multiple negative electrode sheets 18 at the first interval 212, and the two positive electrode conveying mechanisms 40 alternately place the positive electrode sheets 48 on the material strip, and the material strip is stacked in the material receiving piece 90.

[0098] Specifically, if Figure 4 As shown, S60 includes:

[0099] S61: The second identification member 52 identifies the second gap 211 between the two negative electrode sheets 18, indicating that the production of the previous battery cell has been completed;

[0100] S62: The winding needle 80 clamps the material strip, and the cutter 70 receives the information of the second identification element 52. After the last negative electrode sheet 18 of the previous battery cell passes through the cutter 70, the cutter 70 cuts the second gap 211;

[0101] S63: The winding needle 80 clamps the cut material strip and moves to the downstream of the cutter 70 to start winding the waste material;

[0102] S64: After the first identification member 51 identifies the joint position, the battery cell is produced normally and a second gap 211 is formed behind the joint position; (See S61-S66 for details) Figure 7 )

[0103] S65: The second recognition member 52 recognizes the second gap 211 behind the engagement position;

[0104] S66: The winding needle 80 stops rotating, and the cutter 70 receives the information of the second identification element 52 and cuts the material strip at the second interval 211 behind the joint position;

[0105] S67: The winding needle 80 retracts, and the operator or the automatic device removes the waste ( Figure 2 The waste removal range 213) is removed to the scrap box, and the winding needle 80 returns to the upstream of the cutter 70; (S65-S67 see Figure 9 )

[0106] S68: Battery cell production continues.

[0107] Through the above-mentioned setting, the second identification member 52 is responsible for identifying the second interval 211 and instructing the cutter 70 and the winding needle 80 to move. During the waste rejection process, the second interval 211 manufactured in cooperation with the negative electrode conveying mechanism 10 can accurately identify the starting position and the end position of the waste rejection range 213, instruct the cutter 70 to cut, and the winding needle 80 to collect the waste rejection range 213. There are only two negative electrode sheets 18 in the waste rejection range 213. Compared with the waste of a large number of negative electrode sheets 18 and positive electrode sheets 48, the waste of raw materials is greatly reduced. At the same time, the first identification member 51 can identify the diaphragm tape 22, which plays the role of instructing the subsequent negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 to start normal production of battery cells again, ensuring a tight production rhythm; in addition, the use of the second identification member 52 and the second interval 211 can also distinguish between the previous battery cell and the next battery cell during normal production of battery cells, thereby improving the automation of production.

[0108] It should be noted that after the second recognition member 52 recognizes the second gap 211, it takes a certain amount of time and distance for the second gap 211 to reach the position of the cutter 70. This time and distance is automatically determined by the background system. In addition, between S67 and S68, the material strip passes through the second drive roller 64, driving the material strip to continue to move downstream.

[0109] Optionally, the second identification component 52 is a CCD camera.

[0110] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A laminated battery cell production device, characterized in that: include: A negative electrode conveying mechanism (10) and two unwinding rollers (20), the two unwinding rollers (20) are respectively located on both sides of the negative electrode conveying mechanism (10), the unwinding rollers (20) are configured to unwind a separator (21) downstream, and each unwinding roller (20) is provided with a residual detection member (30) outside, the residual detection member (30) is used to detect the length of the separator (21) remaining on the unwinding roller (20), the negative electrode conveying mechanism (10) is configured to convey the negative electrode sheet (18) at different intervals between the two separators (21), so as to convey the material belt downstream together with the two separators (21), and the residual detection member (30) is communicatively connected with the negative electrode conveying mechanism (10); Two positive electrode conveying mechanisms (40) are located downstream of the two unwinding rollers (20) in a one-to-one correspondence, and the positive electrode conveying mechanisms (40) are configured to place the positive electrode sheet (48) on the side of the corresponding separator (21) away from the negative electrode sheet (18), and the positive electrode sheets (48) placed by the two positive electrode conveying mechanisms (40) are arranged alternately; a first identification member (51), the first identification member (51) being provided between the positive electrode conveying mechanism (40) on at least one side and the corresponding unwinding roller (20), the first identification member (51) being configured to identify the engagement position of the unwinding roller (20) and to be communicatively connected with the negative electrode conveying mechanism (10) and the positive electrode conveying mechanism (40); Two first hot composite rollers (61), respectively located on both sides of the material strip and configured to heat the material strip; a second identification member (52) located downstream of the first thermal composite roller (61) and configured to identify a gap between the two negative electrode sheets (18); The cutter (70) and the winding needle (80) are located downstream of the second identification member (52), the cutter (70) is in communication with the second identification member (52) and can cut the material strip, the winding needle (80) can clamp the material strip and rotate, and the winding needle (80) can change the upstream and downstream positions relative to the cutter (70); A material connection piece (90) is located downstream of the cutter (70), and the material strip thermally compounded with the positive electrode sheet (48) is stacked in the material connection piece (90).

2. The laminated battery core production device according to claim 1, characterized in that: The first identification element (51) is a color code sensor. The two rolls of the diaphragm (21) on the same unwinding roller (20) are connected by a diaphragm connecting tape (22). The color of the diaphragm connecting tape (22) is different from the color of the diaphragm (21).

3. The laminated battery production device according to claim 1, characterized in that: The negative electrode transport mechanism (10) comprises: a negative electrode unwinding roller (11), configured to release a continuous negative electrode material strip (12); a negative electrode encoding roller (13), located downstream of the negative electrode unwinding roller (11) and configured to print a negative electrode encoding on the negative electrode material strip (12); a negative electrode scanning camera (14), located downstream of the negative electrode encoding roller (13) and configured to identify the negative electrode encoding and defects of the negative electrode strip (12); A negative electrode cutting unit (15), located downstream of the negative electrode scanning camera (14) and configured to cut the continuous negative electrode material strip (12) into individual negative electrode sheets (18); a first feeding roller (16), located downstream of the negative electrode cutting piece (15), and configured to sequentially convey the negative electrode sheets (18) downstream; A first waste rejection component (17) is located downstream of the first feeding roller (16), and the first waste rejection component (17) includes a first material blocking member (171) and a first material collecting member (172). The first material blocking member (171) is connected to the negative electrode scanning camera (14) for communication and can be switched between a first position and a second position. The first material blocking member (171) in the first position allows the negative electrode sheet (18) to enter and be transported between the two diaphragms (21). The first material blocking member (171) in the second position blocks the negative electrode sheet (18) and forces the negative electrode sheet (18) to enter the first material collecting member (172).

4. The laminated battery core production device according to claim 3, characterized in that: The first waste rejection assembly (17) further comprises a first frame and a first rotating drive member mounted on the first frame, the first material blocking member (171) being plate-shaped and connected to the output end of the first rotating drive member, and the first rotating drive member being capable of driving the first material blocking member (171) to rotate and switch between the first position and the second position.

5. The laminated battery core production device according to claim 1, characterized in that: The positive electrode transport mechanism (40) comprises: a positive electrode unwinding roller (41), configured to release a continuous positive electrode material strip (42); A positive electrode encoding roller (43) is located downstream of the positive electrode unwinding roller (41) and is configured to print a positive electrode code on the positive electrode material strip (42); A positive electrode scanning camera (44) is located downstream of the positive electrode encoding roller (43) and is configured to identify defects of the positive electrode encoding and the positive electrode strip (42); A positive electrode cutting unit (45), located downstream of the positive electrode scanning camera (44) and configured to cut the continuous positive electrode strip (42) into individual positive electrode sheets (48); a second feeding roller (46), located downstream of the positive electrode cutting piece (45), and configured to sequentially convey the positive electrode sheets (48) downstream; The second waste rejection assembly (47) is located downstream of the second feeding roller (46). The second waste rejection assembly (47) includes a second blocking member (471) and a second collecting member (472). The second blocking member (471) is connected to the positive electrode scanning camera (44) and can be switched between a third position and a fourth position. The second blocking member (471) in the third position allows the positive electrode sheet (48) to be placed on the diaphragm (21). The second blocking member (471) in the fourth position blocks the positive electrode sheet (48) and forces the positive electrode sheet (48) to enter the second collecting member (472).

6. The laminated battery core production device according to claim 5, characterized in that: The second waste rejection assembly (47) also includes a second frame and a second rotating drive member installed on the second frame. The second material blocking member (471) is plate-shaped and connected to the output end of the second rotating drive member. The second rotating drive member can drive the second material blocking member (471) to rotate and switch between the third position and the fourth position.

7. The laminated battery core production device according to any one of claims 1 to 6, characterized in that: Two second heat-combining rollers (62) are provided upstream of the positive electrode conveying mechanism (40), and the two second heat-combining rollers (62) are configured to heat-combine the two separators (21) and the negative electrode sheet (18).

8. The laminated battery core production device according to any one of claims 1 to 6, characterized in that: A first driving roller (63) is provided upstream of the cutter (70), and a second driving roller (64) is provided downstream of the cutter (70). The winding needle (80) can stay between the cutter (70) and the first driving roller (63) or between the cutter (70) and the second driving roller (64).

9. A method for using a laminated battery cell production device, characterized in that: Applicable to the laminated battery core production device according to any one of claims 1 to 8, the method for using the laminated battery core production device includes: S10: the remaining amount detecting member (30) detects the length of the diaphragm (21) remaining on the unwinding roller (20); S20: Determine whether the remaining length of the diaphragm (21) satisfies the usage of one battery cell. If the determination result is yes, execute S30; if the determination result is no, execute S40; S30: Normal production of battery cells; S40: after the negative electrode conveying mechanism (10) conveys enough negative electrode sheets (18) for one battery cell and then conveys another negative electrode sheet (18) at a second interval (211), both the negative electrode conveying mechanism (10) and the positive electrode conveying mechanism (40) stop conveying; S50: The entire machine is stopped, and the two unwinding rollers (20) are changed, and the two rolls of the diaphragm (21) before and after the change are formed at the joint position; S60: discarding the negative electrode sheet (18) spaced apart from the previous negative electrode sheet (18) by the second interval (211) to the material strip at the joining position; S70: Continue producing battery cells and repeat S10.

10. The method for using the laminated battery production device according to claim 9, characterized in that: The S60 includes: S61: the second identification member (52) identifies the second interval (211) between the two negative electrode sheets (18), indicating that the production of the previous battery cell has been completed; S62: the winding needle (80) clamps the material strip, the cutter (70) receives the information of the second identification element (52), and after the last negative electrode sheet (18) of the previous battery cell passes through the cutter (70), the cutter (70) cuts the second interval (211); S63: the winding needle (80) clamps the cut material strip and moves to the downstream of the cutter (70) to start winding the waste material; S64: After the first identification member (51) identifies the joining position, the battery cell is produced normally and a second gap (211) is formed behind the joining position; S65: the second identification member (52) identifies the second interval (211) behind the engagement position; S66: The cutter (70) receives the information of the second identification member (52) and cuts the material strip at the second interval (211) behind the joining position; S67: The winding needle (80) retracts, the operator removes the waste material, and the winding needle (80) returns to the upstream of the cutter (70).

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