Slitting apparatus
By alternately hot-pressing positive and negative electrode sheets onto the separator strip in the slitting and stacking equipment, combined with visual inspection and buffer tension control, the problem of low production efficiency of existing equipment has been solved, and high-efficiency production of high-quality stacked cells has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI LEAD HUINENG TECH CO LTD
- Filing Date
- 2023-10-12
- Publication Date
- 2026-07-10
AI Technical Summary
The existing cell production efficiency of the slicing and stacking equipment is too low, which leads to an increase in the production cost and cycle of power batteries.
The system employs a combination of a diaphragm unwinding mechanism, an electrode supply device, and a stacking device. Positive and negative electrodes are alternately hot-pressed onto both sides of the diaphragm strip to form a composite strip. In the stacking device, two unit lengths of the composite strip are stacked in each cycle. Combined with visual inspection and buffer tension control, the quality and efficiency of the electrodes are ensured.
This improved the quality pass rate and production efficiency of laminated cells, avoided problems such as poor conductivity and low energy density caused by glue in hot pressing, and doubled the lamination efficiency.
Smart Images
Figure CN117276626B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery manufacturing technology, and in particular to a slitting and stacking device. Background Technology
[0002] With the rapid development of the new energy field, the manufacturing process of power batteries is also constantly improving. Improving the production efficiency of power batteries is of great significance for reducing the production cost and cycle time of power batteries.
[0003] For laminated battery cells, electrode strips need to be cut into electrodes using slitting equipment, and then the electrodes of different polarities are stacked with a separator. However, the existing slitting equipment has too low cell production efficiency, which indirectly increases the production cost and production cycle of power batteries. Summary of the Invention
[0004] This application discloses a cutting and stacking device that can improve the production efficiency of stacked battery cells.
[0005] To achieve the above objectives, this application discloses a cutting and stacking device, comprising: a diaphragm unwinding mechanism for unwinding diaphragm strip; two electrode supply devices arranged sequentially downstream of the diaphragm unwinding mechanism, one of which provides a positive electrode and heat-presses the positive electrode to one side of the diaphragm strip, and the other provides a negative electrode and heat-presses the negative electrode to the other side of the diaphragm strip to form a composite strip; and a stacking device located downstream of the two electrode supply devices for receiving the composite strip and stacking two unit lengths of the composite strip in each cycle to form a stacked battery cell.
[0006] Optionally, the electrode supply device includes: an electrode unwinding mechanism for unwinding electrode strip; an electrode cutting mechanism located downstream of the electrode unwinding mechanism for cutting the electrode strip to form an electrode; an electrode conveying mechanism for conveying the electrode strip or electrode; and a hot pressing mechanism for hot pressing the electrode onto the diaphragm strip.
[0007] Optionally, the electrode conveying mechanism includes a rotating member, and the electrode unwinding mechanism, the electrode cutting mechanism, and the hot pressing mechanism are arranged circumferentially around the rotating member along the rotation direction of the rotating member.
[0008] Optionally, the rotating component includes an outer peripheral surface with adsorption holes for adsorbing electrode strips or electrodes.
[0009] Optionally, the electrode supply device further includes: a plurality of feed rollers located upstream of the electrode cutting mechanism, for guiding the electrode strip to fit tightly against the outer peripheral surface.
[0010] Optionally, the electrode supply device further includes two guide rollers, located upstream and downstream of the hot pressing mechanism, respectively. The upstream guide roller is used to guide the diaphragm strip to adhere to the rotating member, and the downstream guide roller is used to guide the composite strip to disengage from the rotating member.
[0011] Optionally, the electrode supply device further includes: a first electrode detection mechanism, located downstream of the electrode cutting mechanism, for detecting whether the electrode is qualified; an electrode unloading guide plate, located between the first electrode detection mechanism and the hot pressing mechanism, for guiding unqualified electrode unloading, and the electrode conveying mechanism is configured to guide unqualified electrode to the electrode unloading guide plate according to the detection result of the first electrode detection mechanism.
[0012] Optionally, the hot pressing mechanism includes: a hot pressing roller; and a telescopic component for driving the hot pressing roller to hot press or move away from the diaphragm strip.
[0013] Optionally, the cutting and stacking equipment further includes a visual inspection device, comprising: two second electrode detection mechanisms located upstream of the stacking device, one of which is used to detect whether the positive electrode is qualified from one side of the composite strip, and the other is used to detect whether the negative electrode is qualified from the other side of the composite strip.
[0014] Optionally, the cutting and stacking equipment further includes a diaphragm measuring mechanism, located downstream of the diaphragm unwinding mechanism, for measuring the conveying speed of the diaphragm strip.
[0015] Optionally, the cutting and stacking equipment further includes a buffer and tension control device located upstream of the stacking device, for adjusting the conveying speed and tension of the composite strip entering the stacking device.
[0016] Optionally, the stacking device includes: a flipping mechanism including a flipping plate, the middle of which is rotatable about a first axis; and a stacking mechanism located downstream of the flipping mechanism, including a stacking platform; wherein the flipping plate is configured to feed two unit lengths of composite strip to the stacking platform every 180° of rotation.
[0017] Compared with the prior art, the beneficial effects of this application are as follows:
[0018] On one hand, two electrode supply devices provide positive and negative electrode sheets to the separator strip, respectively. These positive and negative electrode sheets are alternately arranged on both sides of the separator strip to form a composite strip. This avoids the possibility that glue used in the hot-pressing process might cause poor conductivity and low energy density in the laminated cells, thus improving the quality pass rate of the laminated cells. On the other hand, the laminating device flips two unit lengths of composite strip per cycle, significantly improving lamination efficiency. Therefore, using a cutting and laminating device to prepare laminated cells not only ensures cell quality but also offers high production efficiency. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the cutting and stacking device provided in the embodiments of this application;
[0021] Figure 2 This is a schematic diagram of the structure of the first electrode feeding device in the slicing and stacking equipment provided in the embodiments of this application;
[0022] Figure 3 This is a schematic diagram of the electrode conveying mechanism of the first electrode providing device in the slicing and stacking equipment provided in this application embodiment;
[0023] Figure 4 and Figure 5 These are schematic diagrams of the stacking device of the cutting and stacking equipment provided in the embodiments of this application from two different perspectives;
[0024] Figure 6 This is a flowchart illustrating the fabrication process of the stacked battery cell corresponding to the cutting and stacking equipment provided in this application embodiment;
[0025] Figure 7 , Figure 8 and Figure 9 These are all schematic diagrams of the stacking process of the composite strip corresponding to the cutting and stacking equipment provided in the embodiments of this application;
[0026] Figure 10 This is a cross-sectional schematic diagram of the stacked battery cell corresponding to the stacking equipment provided in the embodiments of this application.
[0027] Figure Descriptions: 100-Cutting and stacking equipment; 110-Diaphragm unwinding mechanism; 120-First electrode feeding device; 121-Electrode unwinding mechanism; 122-Electrode cutting mechanism; 123-Electrode conveying mechanism; 1231-Outer peripheral surface; 1232-Adsorption hole; 1233-Inner peripheral surface; 1234-Vacuum interface; 124-Hot pressing mechanism; 1241-Hot pressing roller; 1242-Telescopic component; 125-Feeding roller; 126-Guide roller; 127-First electrode detection mechanism; 128-Electrode unloading guide plate; 130-Second electrode feeding device; 140-Stacking device; 141-Tilting mechanism; 1411-First base; 1412-Tilting plate; 1413-First flipping plate 1414 - Second flipping finger; 1415 - Flipping drive assembly; 1416 - End A; 1417 - End B; 1418 - Rotating part; 142 - Stacking mechanism; 1421 - Second base; 1422 - Stacking platform; 1423 - First end; 1424 - Second end; 150 - Visual inspection device; 151 - Second electrode detection mechanism; 160 - Diaphragm measuring mechanism; 170 - Buffer and tension control device; 171 - Buffer roller; 172 - Tension control auxiliary mechanism; 210 - Diaphragm strip; 220 - Positive electrode strip; 221 - Positive electrode; 230 - Negative electrode strip; 231 - Negative electrode; 240 - Composite strip; 241 - Stacked cell. Detailed Implementation
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0029] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0030] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0031] Some embodiments of this application provide a cutting and stacking apparatus 100 for manufacturing laminated battery cells 241.
[0032] like Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the laminated cell 241 is formed by zigzag stacking of composite strip 240. The composite strip 240 includes a separator strip 210 and positive electrode 221 and negative electrode 231 hot-pressed onto both sides of the separator strip 210. In some embodiments of this application, along the length direction of the separator strip 210, the positive electrode 221 and negative electrode 231 are alternately hot-pressed onto the separator strip 210, that is, the projections of adjacent positive electrode 221 and negative electrode 231 onto the separator strip 210 do not overlap at all; in other embodiments, the positive electrode 221 and negative electrode 231 may also be hot-pressed onto both sides of the same position on the separator strip 210, that is, the projections of adjacent positive electrode 221 and negative electrode 231 onto the separator strip 210 overlap.
[0033] like Figure 1 As shown, the cutting and stacking equipment 100 includes a diaphragm unwinding mechanism 110, two electrode supply devices, and a stacking device 140. The two electrode supply devices are a first electrode supply device 120 and a second electrode supply device 130. The diaphragm unwinding mechanism 110 is used to unwind the diaphragm material strip 210. The first electrode supply device 120 and the second electrode supply device 130 are arranged sequentially downstream of the diaphragm unwinding mechanism 110. One of the first electrode supply device 120 and the second electrode supply device 130 is used to provide a positive electrode 221 and heat-press the positive electrode 221 to one side of the diaphragm material strip 210, and the other is used to provide a negative electrode 231 and heat-press the negative electrode 231 to the other side of the diaphragm material strip 210 to form a composite material strip 240. The lamination device 140 is located downstream of the first electrode supply device 120 and the second electrode supply device 130. It is used to receive the composite strip 240 and fold two unit lengths of the composite strip 240 in each cycle to form a laminated cell 241.
[0034] On the one hand, compared to the method of bonding the positive electrode 221 and the negative electrode 231 to the separator strip 210 with adhesive to form a composite strip 240, and the method of directly feeding the positive electrode 221 and the negative electrode 231 into the stacking process for stacking, in the cutting and stacking equipment 100 of this application embodiment, the first electrode providing device 120 and the second electrode providing device 130 respectively provide the positive electrode 221 and the negative electrode 231 to the separator strip 210. The positive electrode 221 and the negative electrode 231 are alternately arranged on both sides of the separator strip 210 to form the composite strip 240. This not only avoids the possibility that the adhesive in the hot pressing process may cause poor conductivity and low energy density of the stacked battery cell 241, but also improves the quality pass rate of the stacked battery cell 241. On the other hand, the stacking device 140 flips two unit lengths of the composite strip 240 in each cycle, which can significantly improve the stacking efficiency. Therefore, the cutting and stacking equipment 100 of this application receives the diaphragm material strip 210, the positive electrode material strip 220 and the negative electrode material strip 230, and forms the stacked battery cell 241 after multiple processes. Not only can the quality of the battery cell be guaranteed, but it also has high production efficiency.
[0035] The diaphragm unwinding mechanism 110 is used to unwind the diaphragm strip 210.
[0036] In some embodiments of this application, the cutting and stacking equipment 100 further includes a diaphragm measuring mechanism 160, located downstream of the diaphragm unwinding mechanism 110, for measuring the conveying speed of the diaphragm strip 210.
[0037] By measuring the conveying speed of the diaphragm strip 210, the unwinding speed of the diaphragm unwinding mechanism 110 can be adjusted so that the conveying speed of the diaphragm strip 210 matches the rhythm of the first electrode supply device 120, the second electrode supply device 130, and the stacking device 140.
[0038] In some embodiments of this application, the diaphragm measuring mechanism 160 is a speed measuring roller, which obtains the conveying speed of the diaphragm belt 210 by converting angular velocity into linear velocity. In other embodiments, the diaphragm measuring mechanism 160 may also be an infrared velocimeter or an encoder, etc.
[0039] In some embodiments of this application, the first electrode providing device 120 is used to provide the positive electrode 221, and the second electrode providing device 130 is located downstream of the first electrode providing device 120 and is used to provide the negative electrode 231; in other embodiments, the first electrode providing device 120 may be used to provide the negative electrode 231, and the second electrode providing device 130 may be used to provide the positive electrode 221.
[0040] The following describes one type of electrode supply device, taking the first electrode supply device 120 used to provide the positive electrode 221 as an example.
[0041] like Figure 2 and Figure 3 As shown, the first electrode supply device 120 includes an electrode unwinding mechanism 121, an electrode cutting mechanism 122, an electrode conveying mechanism 123, and a hot pressing mechanism 124. The electrode unwinding mechanism 121 is used to unwind the positive electrode strip 220. The electrode cutting mechanism 122 is located downstream of the electrode unwinding mechanism 121 and is used to cut the positive electrode strip 220 to form a positive electrode 221. The electrode conveying mechanism 123 is used to convey the positive electrode strip 220 or the positive electrode 221. The hot pressing mechanism 124 is used to hot press the positive electrode 221 onto the diaphragm strip 210.
[0042] With this arrangement, the positive electrode strip 220 can be cut and processed to form the positive electrode 221, and the positive electrode 221 can be hot-pressed and bonded to the diaphragm strip 210.
[0043] Furthermore, the electrode conveying mechanism 123 includes a rotating member that rotates about a first axis P. Along the rotation direction of the rotating member, the electrode unwinding mechanism 121, the electrode cutting mechanism 122, and the hot pressing mechanism 124 are arranged circumferentially around the rotating member. The rotating member includes an outer peripheral surface 1231, which is used to convey the positive electrode strip 220 or the positive electrode 221.
[0044] In some embodiments of this application, the rotating element is a rotating roller; in other embodiments, the rotating element may also be a turntable.
[0045] This arrangement allows for the conveying of the positive electrode strip 220 or the positive electrode 221 in a relatively small space.
[0046] In other embodiments, the electrode conveying mechanism 123 may also convey the positive electrode strip 220 or the positive electrode 221 in a linear conveying manner.
[0047] The electrode unwinding mechanism 121 is used to unwind the positive electrode 221. The electrode cutting mechanism 122 is located downstream of the electrode unwinding mechanism 121. The cutter of the electrode cutting mechanism 122 extends toward the electrode conveying mechanism 123 to cut the positive electrode strip 220 to form the positive electrode 221.
[0048] In some embodiments of this application, the first electrode providing device 120 further includes a plurality of feeding rollers 125 located upstream of the electrode cutting mechanism 122, for guiding the positive electrode strip 220 to fit tightly against the outer peripheral surface 1231.
[0049] For example, the number of feed rollers 125 is three; or, for another example, the number of feed rollers 125 is four, five, etc.
[0050] By using the feeding roller 125, the positive electrode strip 220 can be pressed against the outer peripheral surface 1231, so that the electrode cutting mechanism 122 can cut the positive electrode strip 220.
[0051] In some embodiments of this application, the outer peripheral surface 1231 is provided with a plurality of adsorption holes 1232, which are used to adsorb the positive electrode strip 220 or the positive electrode 221.
[0052] The electrode conveying mechanism 123 also includes an inner peripheral surface 1233, which has a vacuum interface 1234. The vacuum interface 1234 is connected to the air passage of the adsorption hole 1232. The vacuum interface 1234 is used to connect to an external negative pressure device to provide negative pressure to the adsorption hole 1232.
[0053] In some embodiments of this application, the first electrode supply device 120 further includes a first electrode detection mechanism 127 and an electrode unloading guide plate 128. The first electrode detection mechanism 127 is located downstream of the electrode cutting mechanism 122 and is used to detect whether the positive electrode 221 is qualified. The electrode unloading guide plate 128 is located between the first electrode detection mechanism 127 and the hot pressing mechanism 124 and is used to guide the unqualified positive electrode 221 to be unloaded. The electrode conveying mechanism 123 is configured to guide the unqualified positive electrode 221 to the electrode unloading guide plate 128 according to the detection result of the first electrode detection mechanism 127.
[0054] The first electrode inspection mechanism 127 identifies whether the outline of the positive electrode 221 meets preset requirements by taking a picture. If the outline of the positive electrode 221 does not meet the preset requirements, the positive electrode 221 is judged to be a defective product. The suction hole 1232 of the electrode conveying mechanism 123 closes the negative pressure to release the positive electrode 221, which falls onto the electrode unloading guide plate 128. If the outline of the positive electrode 221 meets the preset requirements, the positive electrode 221 is judged to be a qualified product. The electrode conveying mechanism 123 maintains the suction hole 1232 in a negative pressure state and continues to convey the positive electrode 221 for hot pressing. Furthermore, if the positive electrode 221 is a defective product, the suction hole 1232 can also remove the defective positive electrode 221 by blowing air.
[0055] In some embodiments of this application, the hot pressing mechanism 124 includes a hot pressing roller 1241 and a telescopic component 1242, the telescopic component 1242 being used to drive the hot pressing roller 1241 to hot press or move away from the diaphragm strip 210.
[0056] The hot pressing roller 1241 is installed at the output end of the telescopic component 1242. The electrode conveying mechanism 123 adsorbs the qualified positive electrode 221 and brings it to the corresponding position of the hot pressing mechanism 124. The telescopic component 1242 drives the hot pressing roller 1241 to approach the outer peripheral surface 1231 and abut against the diaphragm material belt 210. The positive electrode 221 is hot-pressed and bonded to the diaphragm material belt 210 on the inner side of the diaphragm material belt 210.
[0057] The number of hot pressing mechanisms 124 can be one or more. For example, there can be three hot pressing mechanisms 124; there can be four or five hot pressing mechanisms 124, and so on.
[0058] In some embodiments of this application, the first electrode providing device 120 further includes two guide rollers 126, located upstream and downstream of the hot pressing mechanism 124, respectively. The upstream guide roller 126 is used to guide the diaphragm strip 210 to adhere to the rotating member, and the downstream guide roller 126 is used to guide the composite strip 240 to disengage from the rotating member.
[0059] Two guide rollers 126 can guide the diaphragm strip 210 along the circumference of the electrode conveying mechanism 123 through the hot pressing mechanism 124, so that the diaphragm strip 210 or composite strip 240 is tightly attached to the outer peripheral surface 1231, thereby ensuring the hot pressing quality of the positive electrode 221 and the diaphragm strip 210.
[0060] like Figure 1 As shown, the second electrode supply device 130 receives the negative electrode strip 230, cuts the negative electrode strip 230 to form a negative electrode 231, and then heat-presses the negative electrode 231 onto the separator strip 210 to form a composite strip 240. The structure of the second electrode supply device 130 is the same as that of the first electrode supply device 120, and will not be described further here.
[0061] like Figure 1 As shown, in some embodiments of this application, the cutting and stacking device 100 further includes a visual inspection device 150, which includes two second electrode detection mechanisms 151 located upstream of the stacking device 140. One of the second electrode detection mechanisms 151 is used to detect whether the positive electrode 221 is qualified from one side of the composite strip 240, and the other second electrode detection mechanism 151 is used to detect whether the negative electrode 231 is qualified from the other side of the composite strip 240.
[0062] The visual inspection device 150 can check again whether the shape and bonding position of the positive electrode 221 and the negative electrode 231 meet the requirements before the composite strip 240 enters the stacking device 140.
[0063] When the test result of at least one second electrode testing mechanism 151 is unqualified, in some embodiments, the diaphragm unwinding mechanism 110 is configured to stop unwinding the diaphragm strip 210; in other embodiments, the composite strip 240 may be cut, or the unqualified stacked cell 241 may be discarded after a complete stacked cell 241 is stacked.
[0064] like Figure 1 As shown, in some embodiments of this application, the cutting and stacking device 100 further includes a buffer and tension control device 170, located upstream of the stacking device 140, for adjusting the conveying speed and tension of the composite strip 240 entering the stacking device 140.
[0065] The buffer and tension control device 170 includes a buffer roller 171 and a tension control auxiliary mechanism 172, with the buffer roller 171 located upstream of the tension control auxiliary mechanism 172. The buffer and tension control device 170 effectively ensures that the tension of the composite strip 240 entering the stacking device 140 remains stable, thereby maintaining a stable conveying speed of the composite strip 240 received by the stacking device 140 and improving the stacking quality of the stacking device 140.
[0066] like Figure 4 and Figure 5 As shown, the stacking device 140 includes a flipping mechanism 141 and a stacking mechanism 142. The flipping mechanism 141 includes a flipping plate 1412, the middle of which is rotatable about a first axis Q. The flipping plate 1412 is used to receive composite strip 240. The stacking mechanism 142 is located downstream of the flipping mechanism 141 and includes a stacking platform 1422. The flipping plate 1412 is configured to feed two unit lengths of composite strip 240 to the stacking platform 1422 every 180° of flipping.
[0067] like Figure 7 , Figure 8 and Figure 9 As shown, it can be understood that the laminated cell 241 is folded in a Z-shaped folding manner. The length of the laminated cell 241 is one unit length of composite material strip 240. Each unit length of composite material strip 240 is hot-pressed and bonded with a positive electrode 221 or a negative electrode 231. The flip plate 1412 flips 180° every cycle to fold two unit lengths of composite material strip 240.
[0068] The unit length of the composite strip 240 refers to the length L of the laminated cell 241; the length of two unit lengths of the composite strip 240 is 2L, which is the same as the spacing between the first flipping finger 1413 and the second flipping finger 1414 described below.
[0069] Specifically, the flipping mechanism 141 includes a first base 1411, and the stacking mechanism 142 includes a second base 1421. The flipping plate 1412 is rotatably mounted on the first base 1411 about a first axis Q, and the stacking platform 1422 is mounted on the second base 1421.
[0070] The flip plate 1412 has a first flipping finger 1413 and a second flipping finger 1414 at its two ends. The flipping mechanism 141 also includes a flipping drive assembly 1415, which is mounted on the first base 1411 and is used to drive the flip plate 1412 to rotate continuously around the second axis P. Taking one cycle as an example, along the conveying direction X when the composite material belt 240 is fed into the stacking device 140, the two ends of the stacking platform 1422 are the first end 1423 and the second end 1424, respectively. The two ends of the flip plate 1412 are the A end 1416 and the B end 1417, respectively. The first flipping finger 1413 is installed at the A end 1416, and the second flipping finger 1414 is installed at the B end 1417. The middle part of the flip plate 1412 is defined as the rotating part 1418. The rotating part 1418 corresponds to the first end 1423 of the stacking platform 1422. During the rotation of the flipping plate 1412, end A 1416 and end B 1417 correspond to the second end 1424 of the stacking platform 1422 in sequence. The first flipping finger 1413 of end A 1416 drives the composite material strip 240 to the second end 1424 of the stacking platform 1422, and then retracts to allow the second flipping finger 1414 of end B 1417 to drive the next section of composite material strip 240 to the second end 1424 of the stacking platform 1422. Since the distance between end A 1416 and end B 1417 is two unit lengths of composite material strip 240, the flipping plate 1412 can convey two unit lengths of composite material strip 240 to the stacking platform 1422 every 180° rotation.
[0071] In other embodiments, the composite strip 240 may also be fed vertically to the stacking mechanism 142.
[0072] The working principle of the cutting and stacking device 100 in this embodiment is as follows:
[0073] The diaphragm unwinding mechanism 110 unwinds the diaphragm strip 210, and the diaphragm measuring mechanism 160 measures the conveying speed of the diaphragm strip 210 in real time. The diaphragm unwinding mechanism 110 adjusts the unwinding speed in real time according to the measurement results of the diaphragm measuring mechanism 160.
[0074] In the first electrode supply device 120, the electrode unwinding mechanism 121 unwinds the positive electrode strip 220. The positive electrode strip 220 passes through three feeding rollers 125 and is vacuum-adsorbed onto the outer peripheral surface 1231 of the electrode conveying mechanism 123. The electrode conveying mechanism 123 rotates to drive the positive electrode strip 220 to be conveyed synchronously. The electrode cutting mechanism 122 cuts the positive electrode strip 220 to form a positive electrode 221. The positive electrode 221 passes through the first electrode detection mechanism 127, which takes a picture of the positive electrode 221 for inspection. The electrode conveying mechanism 123 releases the unqualified positive electrode 221. The unqualified positive electrode 221 falls into the electrode unloading guide plate 128 and is unloaded. The qualified positive electrode 221 is conveyed to the hot pressing mechanism 124.
[0075] The diaphragm strip 210 enters between the hot press roller 1241 of the hot press mechanism 124 and the electrode conveying mechanism 123. The hot press mechanism 124 abuts against the diaphragm strip 210 and heat-presses the positive electrode 221 vacuum adsorbed on the outer peripheral surface 1231 and the outer diaphragm strip 210 together. The diaphragm strip 210 with the positive electrode 221 heat-pressed on it leaves the first electrode supply device 120 and enters the second electrode supply device 130.
[0076] Similar to the working principle of the first electrode supply device 120, after the diaphragm material strip 210 passes through the second electrode supply device 130, the positive electrode 221 and the negative electrode 231 are alternately hot-pressed and bonded on both sides of the diaphragm material strip 210 to form a composite material strip 240.
[0077] The composite strip 240 passes through the visual inspection device 150 to re-inspect whether the shape and position of the positive electrode 221 and the negative electrode 231 meet the requirements;
[0078] The composite material belt 240 passes through the buffer and tension control device 170, which further adjusts the conveying speed and tension of the composite material belt 240 entering the stacking device 140.
[0079] The composite strip 240 enters the stacking device 140. The flipping plate 1412 of the flipping mechanism 141 feeds two unit lengths of composite strip 240 to the stacking mechanism 142 every 180° flipping. It continues to flip 180° and feeds two more unit lengths of composite strip 240 to the stacking mechanism 142, thus completing the stacking of the two unit lengths of composite strip 240 in the previous cycle until a stacked cell 241 is formed.
[0080] Using the cutting and stacking equipment 100 of this application embodiment to manufacture the stacked cell 241, the positive electrode 221 and the negative electrode 231 can be alternately hot-pressed and laminated onto the separator strip 210, and then the composite strip 240 after hot lamination is folded. In each cycle, two electrodes are sent to the stacking mechanism 142 for folding. First, the method of forming the composite strip 240 by preheating the composite separator strip 210, the positive electrode 221, and the negative electrode 231 effectively ensures that the electrodes are aligned during stacking. Second, the cutting and stacking equipment 100 has a first electrode detection mechanism 127 that detects and removes unqualified electrodes during electrode cutting, and a vision inspection device 150 that re-inspects the electrode quality before the composite strip 240 enters the stacking device 140 and removes unqualified segments of the composite strip 240, ensuring the quality of the composite strip 240 used for stacking. Third, the stacking device 140 can stack two electrodes in one cycle, further improving the stacking efficiency. Compared with the stacking efficiency of common Z-type stacking machines, the stacking efficiency of the cutting and stacking equipment 100 in this embodiment can be doubled, and the defect rate is significantly reduced, thereby improving the production efficiency and pass rate of the stacked battery cell 241.
[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A slitting and stacking apparatus (100) for manufacturing laminated battery cells (241), characterized in that, include: Diaphragm unwinding mechanism (110) is used to unwind diaphragm strip (210). Two electrode supply devices are arranged sequentially downstream of the diaphragm unwinding mechanism (110). One of the electrode supply devices is used to supply a positive electrode (221) and hot-press the positive electrode (221) to one side of the diaphragm strip (210). The other electrode supply device is used to supply a negative electrode (231) and hot-press the negative electrode (231) to the other side of the diaphragm strip (210) to form a composite strip (240). The electrode supply device includes an electrode conveying mechanism (123), which includes a rotating component, which is a rotating roller, and the rotating component has an outer peripheral surface (1231). The positive electrode (221) and the negative electrode (231) are attached to the outer peripheral surface (1231). The electrode supply device further includes a hot pressing mechanism (124), wherein the diaphragm strip (210) is attached to the outer peripheral surface (1231) and passes through the hot pressing mechanism (124) along the circumferential direction of the electrode conveying mechanism (123) so that the positive electrode (221) and the negative electrode (231) are hot pressed onto the diaphragm strip (210); The lamination device (140), located downstream of the two electrode supply devices, is used to receive composite strip (240) and fold two unit lengths of composite strip (240) in each cycle to form a laminated cell (241). The stacking device (140) includes: The flipping mechanism (141) includes a flipping plate (1412), the middle part of which is rotatable about a first axis; The stacking mechanism (142), located downstream of the flipping mechanism (141), includes a stacking platform (1422). The flip plate (1412) is configured to feed two unit lengths of composite strip (240) to the stacking platform (1422) every 180° rotation. The flip plate (1412) is equipped with a first flipping finger (1413) and a second flipping finger (1414) at both ends. The stacking platform (1422) is divided into a first end (1423) and a second end (1424) at both ends. The middle part of the flip plate (1412) corresponds to the first end (1423) of the stacking platform (1422). During the rotation of the flip plate (1412), the first flipping finger (1413) drives the composite strip (240) to the second end (1424) of the stacking platform (1422), and then retracts to allow the second flipping finger (1414) to drive the next section of the composite strip (240) to the second end (1424) of the stacking platform (1422).
2. The cutting and stacking device (100) according to claim 1, characterized in that, The electrode supply device includes: An electrode unwinding mechanism (121) is used to unwind electrode strip (220). The electrode cutting mechanism (122) is located downstream of the electrode unwinding mechanism (121) and is used to cut the electrode strip to form an electrode. Electrode conveying mechanism (123) is used to convey electrode strips or electrodes; A hot pressing mechanism (124) is used to hot press the electrode sheet onto the diaphragm strip (210).
3. The cutting and stacking device (100) according to claim 2, characterized in that, The electrode conveying mechanism (123) includes a rotating component, and the electrode unwinding mechanism (121), the electrode cutting mechanism (122), and the hot pressing mechanism (124) are arranged circumferentially around the rotating component.
4. The cutting and stacking device (100) according to claim 3, characterized in that, The rotating component includes an outer peripheral surface (1231) with adsorption holes (1232) for adsorbing electrode strips or electrodes.
5. The cutting and stacking device (100) according to claim 4, characterized in that, The electrode supply device further includes: Multiple feed rollers (125) are located upstream of the electrode cutting mechanism (122) to guide the electrode strip to fit tightly against the outer peripheral surface (1231).
6. The cutting and stacking device (100) according to claim 4, characterized in that, The electrode supply device further includes: Two guide rollers (126) are located upstream and downstream of the hot pressing mechanism (124), respectively. The upstream guide roller (126) is used to guide the diaphragm strip to adhere to the rotating component, and the downstream guide roller (126) is used to guide the composite strip to detach from the rotating component.
7. The cutting and stacking device (100) according to claim 2, characterized in that, The electrode supply device further includes: The first electrode testing mechanism (127) is located downstream of the electrode cutting mechanism (122) and is used to test whether the electrode is qualified. The electrode feeding guide plate (128) is located between the first electrode detection mechanism (127) and the hot pressing mechanism (124) and is used to guide the unqualified electrode feeding. The electrode conveying mechanism (123) is configured to guide the unqualified electrode to the electrode feeding guide plate (128) according to the detection result of the first electrode detection mechanism (127).
8. The cutting and stacking device (100) according to claim 2, characterized in that, The hot pressing mechanism (124) includes: Hot press roller (1241); The telescopic component (1242) is used to drive the hot press roller (1241) to hot press or move away from the diaphragm strip.
9. The cutting and stacking device (100) according to claim 1, characterized in that, The slicing and stacking device (100) further includes a visual inspection device (150), comprising: Two second electrode testing mechanisms (151) are located upstream of the stacking device (140). One of the second electrode testing mechanisms (151) is used to test whether the positive electrode (221) is qualified from one side of the composite strip (240), and the other second electrode testing mechanism (151) is used to test whether the negative electrode (231) is qualified from the other side of the composite strip (240).
10. The cutting and stacking device (100) according to claim 1, characterized in that, The slicing and stacking device (100) further includes: A diaphragm measuring mechanism (160), located downstream of the diaphragm unwinding mechanism (110), is used to measure the conveying speed of the diaphragm strip (210).
11. The cutting and stacking device (100) according to claim 1, characterized in that, The slicing and stacking device (100) further includes: A buffer and tension control device (170), located upstream of the stacking device (140), is used to adjust the conveying speed and tension of the composite strip (240) entering the stacking device (140).