A high-speed pole piece connection distance adjustment method and distance adjustment thermal composite method

Abstract

A high-speed pole piece connection distance adjustment method and distance adjustment hot composite method, in which fixed width cutting is completed during pole piece transmission, and the pole piece monomer after cutting is transmitted along multiple distance adjustment rollers with different speeds to achieve distance adjustment processing; the speed change of the distance adjustment roller is only realized when it contacts the pole piece alone and returns to the initial speed before contacting the next pole piece, and the linear speed is the same when two adjacent distance adjustment rollers transmit the pole piece together. The present invention completes the pole piece distance adjustment through the speed change of the distance adjustment roller, has a simple structure, low cost, high efficiency and high spacing consistency, and meets the transmission requirements of pole pieces of different sizes and spacings by changing parameters, and has high versatility; by arranging impurity blowing devices on both sides of the transition transmission section, the impurity blowing time can be appropriately extended without reducing the work efficiency, ensuring the high yield of the product before hot composite, and avoiding the impurity blowing becoming a decoration due to the need to meet the requirements of small working space and high working efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of production of lithium battery pole pieces, and in particular to a high-speed pole piece connection distance adjustment method and a distance adjustment thermal composite method. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. Taking lithium batteries as an example, they are batteries that use lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. They are usually composed of one or more lithium batteries in a battery pack, where lithium battery pole pieces are the core components of lithium battery electrodes, and have functions such as electronic conduction, ion channels, and electrochemical reactions. Battery pole pieces (hereinafter referred to as pole pieces) need to be cut to form individual pole piece monomers, and the pole piece monomers are thermally composited with upper and lower diaphragms (such as MYLAR film, Mylar film). The composite pole pieces can avoid damage during transportation. In order to facilitate the subsequent batch processing of pole pieces during thermal composite, the spacing between adjacent pole pieces needs to be kept consistent.

[0003] The thermal composite process is a process of composite bonding the electrode (positive electrode or negative electrode or positive and negative electrode) and the diaphragm under the action of heat and pressure; in this process, electrode cutting, transportation, spacing, etc. become key links affecting the composite effect and are indispensable.

[0004] In order to improve the cutting efficiency, technicians in this field often adopt the "flying cutting" method for cutting the pole pieces. The so-called "flying cutting" is a method of completing the cutting process without changing the speed or stopping the pole pieces during the transmission process. After "flying cutting", the pole piece monomer enters the thermal composite process, and the impurities in the pole piece after cutting cannot be effectively removed, resulting in the risk of short circuit in the battery cell after thermal composite. On the other hand, because "flying cutting" requires frequent movement and avoidance, the efficiency is stuck, the cost is high, and the maintenance is difficult. The cut pole pieces will flow into the next process for thermal composite. During the transmission process, the spacing between adjacent pole pieces needs to be adjusted. The equipment in the prior art cannot meet the requirements of spacing consistency and the spacing efficiency is low.

[0005] In view of this, the present invention proposes a high-speed pole piece connection distance adjustment method and a distance adjustment thermal composite method to solve the above technical problems. Summary of the invention

[0006] A high-speed pole piece connection and spacing adjustment method comprises: a battery pole piece to be cut is conveyed backward by a main drive device, and a cutter cuts the battery pole piece to a fixed width (the pole piece is not conveyed and is in a stationary state during the cutting process); the cut pole piece is continuously conveyed by a spacing adjustment device, the spacing adjustment device comprises N spacing adjustment structures, the linear speeds of M1 spacing adjustment structures are not completely the same, the linear speeds of M2 spacing adjustment structures in M1 will change (accelerate or decelerate), and the pole piece after the cut is conveyed by the N spacing adjustment structures to complete the spacing adjustment process, wherein N, M1, and M2 are all natural numbers greater than 0, and N≥M1≥M2.

[0007] Preferably, in the high-speed pole piece connection and spacing adjustment method, the device for pole piece cutting is a double cutter structure, the main drive device includes at least two main drive rollers, the spacing adjustment structure is a spacing adjustment roller, the transmission height of the spacing adjustment roller is the same as the transmission height of the main drive roller, and the spacing between two adjacent spacing adjustment rollers is the same or not completely the same (when at least 4 spacing adjustment rollers are included).

[0008] Preferably, in the high-speed pole piece connection and pitch adjustment method, when the pole piece contacts only a single pitch adjustment roller, the pitch adjustment roller that needs to be changed in speed is subjected to speed change processing; when the pole piece is conveyed by two adjacent pitch adjustment rollers, the linear speeds of the two pitch adjustment rollers are the same; the linear speed of each pitch adjustment roller when it first contacts the pole piece is defined as the initial speed of the corresponding pitch adjustment roller, and when the pole piece is separated from one pitch adjustment roller, the linear speed of the corresponding pitch adjustment roller returns to the initial speed before contacting the next pole piece, so as to facilitate the subsequent pole piece pitch adjustment transmission.

[0009] Optionally, it also includes a pressing module, which includes a plurality of lower pressing rollers, and a corresponding lower pressing roller is arranged directly above each of the main driving rollers and each of the distance adjusting rollers. Optionally, the positions of the main driving rollers and the distance adjusting rollers are fixed, and the two ends of the lower pressing rollers are directly or indirectly fixedly connected to the vertical elastic device. The vertical elastic device can adopt any structure in the prior art, which is not elaborated in detail here. By fine-tuning the lower pressing roller up and down, it is ensured that the lower pressing roller applies a certain downward pressure to the edge of the pole piece and does not crush the pole piece, and it is ensured that the product is balanced only when it is transmitted between a group of main driving rollers, the lower pressing roller 3 or only the distance adjusting roller and the lower pressing roller 3, and will not tilt downward due to gravity.

[0010] Optional, such as Figure 1As shown, when the main drive device includes a first main drive roller and a second main drive roller, the roller diameters of the first main drive roller and the second main drive roller are both d1, and the roller spacing is L1. The roller spacing between the second main drive roller and the nearest spacing roller is L2. The diameters of the spacing rollers are both d2, and the roller spacing between two adjacent spacing rollers is L3. D is the width of the pole piece to be cut, D is greater than L1, L2, and L3, D is less than 2L1, 2L3 and less than L1+L2, L2+L3, and the first cutter in the double cutter structure is located in front of the first main drive roller 11, and the second cutter is located between the first main drive roller and the second main drive roller.

[0011] Preferably, in the high-speed pole piece connection distance adjustment method, the distance adjustment device comprises a first distance adjustment roller, a second distance adjustment roller, a third distance adjustment roller, a fourth distance adjustment roller, a fifth distance adjustment roller, and a sixth distance adjustment roller;

[0012] When the pole piece enters the first spacing roller from the second main driving roller, the linear speed of the first main driving roller, the second main driving roller and the first spacing roller is the initial speed V1;

[0013] After the pole piece is separated from the second main driving roller, it is jointly transported by the first spacing roller and the second spacing roller at a linear speed of V1+△V1;

[0014] After the pole piece is separated from the first spacing roller, the first spacing roller falls back to the initial speed V1, and the linear speed of the second spacing roller is increased to V1+2△V1;

[0015] When the electrode piece enters the third spacing roller and is conveyed by the second spacing roller and the third spacing roller, the linear speeds of the second spacing roller and the third spacing roller are both V1;

[0016] After the pole piece is separated from the second pitch-adjusting roller, the linear speed of the second pitch-adjusting roller returns to its initial speed V1+△V1, and the pole piece enters the fourth pitch-adjusting roller at a speed of V1 (the speed of the third pitch-adjusting roller is always V1);

[0017] After the pole piece is separated from the third spacing roller, the pole piece is firstly conveyed by the fourth spacing roller at a linear speed of V1-△V1, and then is conveyed by the fourth spacing roller and the fifth spacing roller at a linear speed of V1-△V1.

[0018] When the pole piece is separated from the fourth spacing roller and is only conveyed by the fifth spacing roller, the fourth spacing roller returns to its initial speed V1, the linear speed of the fifth spacing roller decreases to V1-△V1-△V2, and the pole piece is conveyed by the fifth spacing roller and the sixth spacing roller at a speed of V1-△V1-△V2;

[0019] When the electrode sheet is separated from the fifth spacing roller and is only conveyed by the sixth spacing roller, the linear speed of the fifth spacing roller rises back to the initial speed V1-△V1, and the linear speed of the sixth spacing roller drops to V2. <V1-△V1-△V2;

[0020] After the pole piece is separated from the sixth spacing roller, the linear speed of the sixth spacing roller rises back to V1-△V1-△V2.

[0021] The above V1, △V1, △V2, V2 are not limitations on the corresponding linear speed and speed change value of the pitch regulating roller, but are only described as one of the schemes for speed and pitch adjustment of the pitch regulating roller.

[0022] A high-speed electrode piece spacing adjustment thermal composite method, wherein the cut electrode piece is adjusted in spacing by the spacing adjustment device and then flows into a transition conveying section, upper and lower diaphragms are introduced after the conveying in the transition conveying section, and the upper and lower diaphragms are thermally composited on the upper and lower plate surfaces of the electrode piece, wherein the cutting and spacing adjustment method before the electrode piece flows into the transition conveying section is as described above.

[0023] Preferably, in the high-speed pole piece pitch-adjusting thermal composite method, the linear speed of the transition conveying section is less than or equal to the linear speed of the last pitch-adjusting roller in the pitch-adjusting device.

[0024] Preferably, in the high-speed electrode spacing-adjustable thermal composite method, diaphragm feed guide rollers for the upper diaphragm and the lower diaphragm are respectively arranged behind the transition conveying section, diaphragm feed pinch rollers are arranged behind the diaphragm feed guide rollers, and composite rollers are arranged behind the diaphragm feed pinch rollers, and the transition conveying section, diaphragm feed guide rollers, diaphragm feed pinch rollers and composite rollers are at the same height as the spacing-adjustable conveying height.

[0025] Preferably, in the high-speed pole piece pitch-adjustable thermal composite method, a plurality of impurity blowing devices are arranged on both sides of the transition conveying section. Although impurity blowing pipes are also arranged on both sides of a similar transition conveying section in the prior art, in order to improve the thermal composite efficiency, the impurity blowing time is short, and the impurities cannot be blown away in a real sense. In this patent, the speed and pitch of the pitch-adjustable roller are changed to greatly improve the pitch-adjusting efficiency, and more time is reserved for impurity blowing, thereby ensuring that the purpose of impurity blowing is truly achieved on the basis of high working efficiency of the entire thermal composite process.

[0026] Optionally, the composite roller is a roller structure integrating heating and pressing composite functions.

[0027] The advantages are as follows:

[0028] (1) The pole piece connection and spacing adjustment method of the present invention can complete the spacing adjustment of the pole pieces only by the variable speed transmission of the spacing adjustment roller, which has high working efficiency, low device cost, small space occupied by the spacing adjustment and low maintenance cost;

[0029] (2) The pole piece connection and spacing adjustment method of the present invention meets the requirements of different pole piece cutting sizes and different spacing adjustment sizes by setting the size, number, spacing and speed of the spacing adjustment rollers, and has high versatility;

[0030] (3) The pole piece connection and distance adjustment method of the present invention ensures the smooth transmission of the pole piece after cutting, and the distance adjustment is completed during the smooth transmission process, which is highly safe;

[0031] (4) The pole piece connection and spacing adjustment method of the present invention uses double-knife slicing to meet the requirements of variable speed transmission and thermal compounding, further reducing costs;

[0032] (5) The highly efficient pole piece connection distance adjustment method of the present invention ensures that there is enough time to blow away impurities in the subsequent transition transfer section, thereby ensuring a high yield before the pole piece is thermally composited;

[0033] (6) The above (1) to (5) ensure high yield, high efficiency and low cost of the electrode after the spacing adjustment thermal compounding. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The specific implementation is further described below in conjunction with the accompanying drawings, wherein:

[0035] Figure 1 This is a schematic diagram of a high-speed pole piece connection and spacing adjustment method according to the present invention;

[0036] Figure 2 The present invention is a simplified diagram of a high-speed pole piece distance adjustment thermal composite method.

[0037] The specific structure corresponding to the number is as follows:

[0038] The first main drive roller 11, the second main drive roller 12, the first spacing roller 21, the second spacing roller 22, the third spacing roller 23, the fourth spacing roller 24, the fifth spacing roller 25, the sixth spacing roller 26; the lower pressure roller 3, the transition conveying section 4, the diaphragm feeding guide roller 5, the diaphragm feeding clamping roller 6, and the composite roller 7.

[0039] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION Specific embodiment 1:

[0041] A high-speed pole piece connection and spacing adjustment method, comprising: conveying a battery pole piece to be cut backwards by a first main drive roller 11 and a second main drive roller 12 in a main drive device, wherein the cutter is a double cutter structure including a first cutter and a second cutter, wherein the first cutter is located in front of the first main drive roller 11, and the second cutter is located between the first main drive roller 11 and the second main drive roller 12, so as to complete the fixed width cutting of the battery pole piece, and the first cutter and the second cutter are 120 mm apart;

[0042] Specifically, the roller diameters of the first main driving roller 11 and the second main driving roller 12 are both d1 (70 mm), and the roller spacing is L1 (100 mm). The spacing adjustment device includes a first spacing adjustment roller 21, a second spacing adjustment roller 22, a third spacing adjustment roller 23, a fourth spacing adjustment roller 24, a fifth spacing adjustment roller 25, and a sixth spacing adjustment roller 26. The roller spacing between the second main driving roller 12 and the first spacing adjustment roller is L2 (100 mm). The diameters of the spacing adjustment rollers are both d2 (70 mm), and the spacing between two adjacent spacing adjustment rollers is L3 (100 mm). The width dimension D of the pole piece to be cut is 120 mm.

[0043] When the pole piece enters the main drive device, the linear speed of the first main drive roller 11, the second main drive roller 12 and the first spacing roller 21 is an initial speed of 2 m / s;

[0044] After the pole piece is separated from the second main driving roller 12, it is jointly transported by the first spacing roller 21 and the second spacing roller 22 at a linear speed of 2.2 m / s;

[0045] After the electrode piece is separated from the first spacing roller 21, the first spacing roller 21 falls back to the initial speed of 2 m / s, and the linear speed of the second spacing roller 22 is increased to 2.4 m / s;

[0046] When the electrode sheet enters the third spacing roller 23 and is conveyed by the second spacing roller 22 and the third spacing roller 23, the linear speeds of the second spacing roller 22 and the third spacing roller 23 are both 2 m / s;

[0047] After the pole piece is separated from the second spacing roller 22, the linear speed of the second spacing roller 22 returns to its initial speed of 2.2 m / s, and the pole piece enters the fourth spacing roller 24 at a speed of 2 m / s (the linear speed of the third spacing roller 23 is always 2 m / s);

[0048] After the pole piece is separated from the third spacing roller 23, the pole piece is firstly conveyed by the fourth spacing roller 24 at a linear speed of 1.8 m / s, and then is conveyed by the fourth spacing roller 24 and the fifth spacing roller 25 at a linear speed of 1.8 m / s.

[0049] When the electrode sheet is separated from the fourth spacing roller 24 and is only conveyed by the fifth spacing roller 25, the fourth spacing roller 24 returns to its initial speed of 2 m / s, the linear speed of the fifth spacing roller 25 decreases to 1.5 m / s, and is conveyed by the fifth spacing roller 25 and the sixth spacing roller 26 at a linear speed of 1.5 m / s;

[0050] When the electrode sheet is separated from the fifth spacing roller 25 and is only conveyed by the sixth spacing roller 26, the linear speed of the fifth spacing roller 25 returns to the initial speed of 1.8 m / s, and the linear speed of the sixth spacing roller 26 decreases to 1 m / s;

[0051] After the pole piece is separated from the sixth spacing roller, the linear speed of the sixth spacing roller is increased to 1.5 m / s. The spacing between the pole pieces after spacing adjustment is 4 mm.

[0052] It should be noted that in this specific implementation case, the above V1 (2m / s), △V1 (0.2m / s), △V2 (0.3m / s), and V2 (1m / s) are not limitations on the linear speed and speed change value of the pitch-adjusting roller, but are only explained as one of the schemes for speed and pitch adjustment of the pitch-adjusting roller. Specific embodiment 2:

[0054] On the basis of the specific implementation example 1, a material pressing module is also included. During the electrode piece connection and spacing adjustment process, a lower pressing roller 3 is correspondingly arranged directly above each main driving roller and each spacing adjustment roller that the electrode piece passes during the transmission process.

[0055] Optionally, the conveying height of the main drive roller and the spacing roller is fixed, and the two ends of the lower pressure roller 3 are directly or indirectly fixedly connected to the vertical elastic device. The vertical elastic device can adopt any structure in the prior art (for example, the end of the lower pressure roller is rotatably mounted on the end mounting block plate through a rolling bearing, the end mounting block is fixedly connected to the lower end of the vertical spring and the end mounting block is fixedly connected to the slider of the vertical slide rail, and the upper end of the spring is fixedly connected to the spring mounting frame). It is not specifically described here. The lower pressure roller 3 is finely adjusted up and down to ensure that the lower pressure roller 3 applies a certain downward pressure to the edge of the pole piece and does not crush the pole piece, and to ensure that the product is balanced only when it is conveyed between a group of main drive rollers, the lower pressure roller 3, or only between the spacing roller and the lower pressure roller 3, and does not tilt downward due to gravity. Specific embodiment 3:

[0057] A high-speed electrode piece connection and distance adjustment thermal composite method, wherein the cut electrode piece is adjusted in distance by the distance adjustment device and then flows into a conveyor steel belt (i.e., transition conveyor section 4), and after the upper and lower diaphragms are introduced behind the conveyor steel belt, the upper and lower diaphragms are thermally composited on the upper and lower surfaces of the electrode piece, wherein the cutting and distance adjustment method before the electrode piece flows into the conveyor steel belt is as described in specific implementation case 1.

[0058] The linear speed of the conveyor steel belt is 1 m / s.

[0059] Optionally, a diaphragm feed guide roller 5 for the upper diaphragm and the lower diaphragm respectively is arranged behind the conveying steel belt, a diaphragm feed clamping roller 6 is arranged behind the conveying of the diaphragm feed guide roller 5, and a composite roller 7 is arranged behind the conveying of the diaphragm feed clamping roller 6. The conveying heights of the transition conveying section 4, the diaphragm feed guide roller 5, the diaphragm feed clamping roller 6 and the composite roller 7 are the same.

[0060] Optionally, six gas blowing devices are respectively provided on both sides of the conveyor steel belt. Although impurity blowing pipes are also provided on both sides of the transition conveying section 4 in the prior art, the impurity blowing time is greatly shortened in order to improve the thermal composite efficiency, and the impurity blowing effect cannot be truly achieved. Here, the speed and pitch of the adjustable roller are changed to greatly improve the pitch adjustment efficiency, and more time is reserved for subsequent impurity blowing, thereby ensuring the high working efficiency of the entire thermal composite process while truly achieving the purpose of impurity blowing.

[0061] Optionally, the composite roller 7 is a roller structure integrating heating and pressing composite functions.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-speed pole piece connection and spacing adjustment method, comprising the following steps: the battery pole piece to be cut is conveyed backward by a main drive device, and the cutter cuts the battery pole piece to a fixed width; the cut pole piece is further conveyed by a spacing adjustment device, characterized in that: The distance adjustment device includes N distance adjustment structures, the linear speeds of the M1 distance adjustment structures are not completely the same, the linear speeds of the M2 distance adjustment structures in M1 will change, and the cut pole pieces are transported by the N distance adjustment structures to complete the distance adjustment process, wherein N, M1, and M2 are all natural numbers greater than 0, and N≥M1≥M2; The distance adjustment structure is a distance adjustment roller, and when the pole piece is in contact with only one of the distance adjustment rollers, the speed of the distance adjustment roller to be changed is changed; When the pole piece is conveyed by two adjacent spacing rollers, the linear speeds of the two spacing rollers are the same; the linear speed of each spacing roller when it first contacts the pole piece is defined as the initial speed of the corresponding spacing roller; when the pole piece is separated from one of the spacing rollers, the linear speed of the corresponding spacing roller is restored to the initial speed before contacting the next pole piece, so as to provide for the subsequent pole piece spacing adjustment and conveying.

2. A high-speed pole piece connection distance adjustment method as claimed in claim 1, characterized in that: The device for cutting the pole piece is a double cutter structure, the main drive device includes at least two main drive rollers, the conveying height of the spacing roller is the same as the conveying height of the main drive roller, and the spacing between two adjacent spacing rollers is the same or not completely the same.

3. A high-speed pole piece connection distance adjustment method as claimed in claim 2, characterized in that: It also includes a pressing module, which includes a plurality of lower pressing rollers, and a lower pressing roller is correspondingly arranged directly above each of the main driving rollers and each of the spacing adjusting rollers.

4. A high-speed pole piece connection distance adjustment method as claimed in claim 2, characterized in that: When the main drive device includes a first main drive roller and a second main drive roller, the first cutter in the double cutter structure is located in front of the first main drive roller, and the second cutter is located between the first main drive roller and the second main drive roller; the roller diameters of the first main drive roller and the second main drive roller are both d1, and the roller spacing is L1, the roller spacing between the second main drive roller and the nearest spacing roller is L2, the diameters of the spacing rollers are both d2, the roller spacings of two adjacent spacing rollers are the same and the roller spacing is L3, D is the width of the pole piece to be cut, D is greater than L1, L2, and L3, D is less than 2L1, 2L3, and less than L1+L2, L2+L3.

5. A high-speed pole piece connection distance adjustment method as claimed in claim 4, characterized in that: The distance adjusting device comprises a first distance adjusting roller, a second distance adjusting roller, a third distance adjusting roller, a fourth distance adjusting roller, a fifth distance adjusting roller and a sixth distance adjusting roller; When the pole piece enters the first spacing roller from the second main driving roller, the linear speeds of the first main driving roller, the second main driving roller and the first spacing roller are all the initial speed V1; After the pole piece is separated from the second main driving roller, it is jointly transported by the first spacing roller and the second spacing roller at a speed of V1+△V1; After the pole piece is separated from the first spacing roller, the first spacing roller falls back to the initial speed V1, and the speed of the second spacing roller increases to V1+2△V1; When the electrode piece enters the third spacing roller and is conveyed by the second spacing roller and the third spacing roller, the linear speeds of the second spacing roller and the third spacing roller are both V1; After the pole piece is separated from the second pitch-adjusting roller, the linear speed of the second pitch-adjusting roller returns to its initial speed V1+△V1, and the pole piece enters the fourth pitch-adjusting roller at the linear speed of V1; After the pole piece is separated from the third spacing roller, the pole piece is firstly conveyed by the fourth spacing roller at a speed of V1-△V1, and then is conveyed by the fourth spacing roller and the fifth spacing roller at a linear speed of V1-△V1. When the pole piece is separated from the fourth spacing roller and is only conveyed by the fifth spacing roller, the fourth spacing roller returns to its initial speed V1, the speed of the fifth spacing roller decreases to V1-△V1-△V2, and the pole piece is conveyed by the fifth spacing roller and the sixth spacing roller at a speed of V1-△V1-△V2; When the electrode piece is separated from the fifth spacing roller and is only conveyed by the sixth spacing roller, the linear speed of the fifth spacing roller rises back to the initial speed V1-△V1, and the speed of the sixth spacing roller drops to V2. <V1-△V1-△V2; After the pole piece is separated from the sixth spacing roller, the linear speed of the sixth spacing roller rises back to V1-△V1-△V2.

6. A high-speed electrode piece connection and distance adjustment thermal composite method, the steps are as follows: the cut electrode piece flows into the transition conveying section after being adjusted in distance by the distance adjustment device, the upper and lower diaphragms are introduced after the transmission of the transition conveying section, and the upper and lower diaphragms are thermally composited on the upper and lower plate surfaces of the electrode piece, characterized in that: The cutting and spacing adjustment method before the pole piece flows into the transition conveying section is as described in any one of claims 1 to 5.

7. A high-speed pole piece connection and distance adjustment thermal composite method as claimed in claim 6, characterized in that: The transition conveying section is provided with diaphragm feed guide rollers for the upper diaphragm and the lower diaphragm respectively behind the conveying, the diaphragm feed pinching roller is provided behind the conveying of the diaphragm feed guide roller, and the composite roller is provided behind the conveying of the diaphragm feed pinching roller. The transition conveying section, diaphragm feed guide roller, diaphragm feed pinching roller and composite roller are at the same height as the adjustable distance conveying.

8. A high-speed pole piece connection and distance adjustment thermal composite method as claimed in claim 6, characterized in that: The linear speed of the transition conveying section is less than or equal to the linear speed of the last spacing roller in the spacing adjusting device.

9. A high-speed pole piece connection and distance adjustment thermal composite method as claimed in claim 6, characterized in that: A plurality of impurity blowing devices are arranged on both sides of the transition conveying section.

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