A kind of battery cell preheating and hot pressing integrated equipment

Abstract

The present invention discloses an integrated device for preheating and hot pressing of battery cells, which is mainly composed of a hot pressing mold, a transport conveyor belt, a lifting device, a vertical frame, a hot pressing platform, etc. During operation, the lower mold of the carrier filled with battery cells is sent to the lifting device via the transport conveyor belt, and the push mechanism drives the transfer conveyor belt, and cooperates with the inclined lifting plate to complete the transfer of the lower mold of the carrier on the hot pressing platform. The clamping mechanism is accurately positioned, and then the hot pressing platform falls down to close the mold, and hot pressing is achieved through the built-in heating module and power supply structure. Compared with traditional equipment, it has significant advantages: through integrated design and automated processes, it greatly improves production efficiency; with the help of sensors, it accurately controls each component to improve the accuracy and consistency of hot pressing; with a compact and reasonable structural design, it enhances the stability of the equipment, effectively reduces labor intensity and defective rate, reduces the equipment footprint, and meets the needs of high-quality battery cell production.

Description

Technical Field

[0001] The present invention relates to the field of battery core hot pressing, and in particular to a battery core preheating and hot pressing integrated equipment. Background Art

[0002] In the production and manufacturing of lithium-ion batteries, cylindrical rolled cells are widely used in various electronic products, electric vehicles, energy storage systems and other fields due to their high energy density, good cycle performance and easy large-scale production. The hot pressing process of the cell, as a key production link, plays a decisive role in the performance and quality of the cell. Hot pressing can make the positive and negative electrodes inside the cell fit tightly with the diaphragm, reduce contact resistance, improve ion transmission efficiency, and thus improve the battery's charge and discharge performance and stability.

[0003] However, there are many disadvantages in the traditional hot pressing equipment currently on the market. In terms of production efficiency, traditional equipment is difficult to achieve batch processing, and its production capacity is obviously insufficient in the face of growing market demand. For example, in the large-scale production of electric vehicle batteries, the low efficiency of traditional equipment has seriously restricted the expansion of production scale. At the same time, the operation process of traditional hot pressing equipment is complicated and requires a lot of manual participation. From the loading and positioning of the battery cell to the adjustment of the hot pressing parameters, it depends on manual operation, which not only greatly increases the labor intensity of the workers, but also easily introduces human errors. Once the operation is wrong, it may lead to unqualified hot pressing quality of the battery cell, increase the product defective rate, and increase production costs. In addition, the structural design of traditional equipment is not reasonable, the volume is large, and the area is large. In the modern production workshop where every inch of land is valuable, the limited site resources restrict the company from expanding the scale of production and hinder the further development of the company. Summary of the invention

[0004] Based on this, it is necessary to provide an integrated battery cell preheating and hot pressing device to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A battery cell preheating and hot pressing integrated equipment, comprising a hot pressing mold for batch hot pressing of battery cells, a transport conveyor belt and a lifting device arranged at the end of the transport conveyor belt, the hot pressing mold comprising a carrier lower mold and a fixed upper mold, the lifting device having a lifting platform, a vertical frame is arranged on the side of the lifting device away from the transport conveyor belt, a plurality of hot pressing platforms stacked and movably arranged in a longitudinal layer and a guide mechanism for limiting the movable direction of the hot pressing platform to the vertical direction are arranged on the vertical frame, a transfer conveyor belt and a push mechanism for driving the transfer transmission belt to move horizontally toward the vertical frame are arranged on the lifting platform, inclined lifting plates for squeezing into between two adjacent hot pressing platforms are arranged on both sides of one end of the transfer transmission belt facing the hot pressing platform, a clamping mechanism for clamping the battery cell hot pressing carrier is arranged on the hot pressing platform, and a fixed upper mold is installed at the bottom of all hot pressing platforms except the bottommost one.

[0007] Furthermore, the length of the transfer transmission belt is smaller than the length of the lifting platform, and the lifting platform is a rectangular frame structure. Both ends of the lifting platform along the length direction of the transfer conveyor belt are formed with avoidance openings for avoiding the transfer conveyor belt. Long side panels are fixedly provided on both sides of the transfer conveyor belt. A limit baffle is provided on the top of the long side panel and is located above the edge of the transfer transmission belt to limit the lateral deviation of the carrier lower mold. The limit baffle is formed with a flared guide portion toward one end of the transport conveyor belt to facilitate the smooth entry of the carrier lower mold.

[0008] Furthermore, the push mechanism includes two groups of double-rod guide rails and single-axis cylinders symmetrically arranged on both sides of the length direction of the transfer conveyor belt. The double-rod guide rails are located below the transfer conveyor belt. Each of the double-rod guide rails is provided with a double-hole slider. Each of the double-hole sliders is fixedly connected to the outer middle part of the corresponding long side plate through a reinforcing connecting piece. The two single-axis cylinders are respectively fixedly arranged on the top of both sides of the lifting platform, and each single-axis cylinder is located above the corresponding double-rod guide rails. An L-shaped traction piece is fixedly connected to the output shaft of the single-axis cylinder, and the lower end of the L-shaped traction piece is fixedly connected to the side of the double-hole slider away from the reinforcing connecting piece.

[0009] Furthermore, the hot pressing platform includes a movable platform arranged in a horizontal state and a rectangular bracket fixedly arranged at the bottom of the movable platform, and the guide mechanism includes four vertical rails fixedly arranged on the vertical frame, and the four corners of the rectangular bracket are respectively slidably connected to the four vertical rails.

[0010] Furthermore, both ends of the rectangular bracket have bottoms provided with recesses for the tip of the inclined lifting plate to slide into, and when the inclined lifting plate is fully inserted into the recesses, the corresponding lower edge of the rectangular bracket is higher than the upper edge of the battery cell in the lower mold of the carrier on the transfer conveyor.

[0011] Furthermore, the clamping mechanism includes a fixed baffle and two side clamps that can move toward each other, the fixed baffle is fixedly set at the end of the top of the movable platform away from the transfer conveyor belt, the two side clamps are symmetrically set at the top of both sides of the movable platform, and short-stroke small cylinders fixed to the bottom of the movable platform are set below both ends of each side clamp, and the output shafts of the short-stroke small cylinders are respectively connected to the ends of the corresponding side clamps, when the fixed baffle and the two side clamps jointly clamp the carrier lower mold, the carrier lower mold corresponds to the fixed upper mold above.

[0012] Furthermore, a small conveyor belt is fixedly provided at the bottom of the movable platform, and the small conveyor belt is arranged at the bottom of one end of the movable platform close to the transfer conveyor belt. A rectangular through hole is opened on the movable platform for allowing the small conveyor belt to leak upward.

[0013] Furthermore, the movable platform is provided with a plurality of strip-shaped through holes perpendicular to the side clamps, and the end of each side clamp is fixedly connected with an L-shaped connector that passes downward through the strip-shaped through hole and is connected to the output shaft of the short-stroke small cylinder.

[0014] Furthermore, both the carrier lower mold and the fixed upper mold have built-in heating modules, contacts for connecting to the heating module are arranged on the bottom surface of the carrier lower mold, and contact electrodes for supplying power to the contacts are arranged on the hot pressing platform.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, improve production efficiency: Traditional equipment is difficult to process in batches. This equipment can achieve batch hot pressing of cylindrical rolled batteries through integrated design, and the automated process reduces manual operations, greatly shortening the production cycle;

[0017] Second, improve hot pressing accuracy: Traditional methods are prone to poor hot pressing accuracy due to manual operation and equipment instability. This equipment uses sensors to accurately control the movement of each component, ensuring accurate positioning of the carrier lower mold and battery cells, stable operation of the hot pressing platform, and improving hot pressing accuracy and consistency;

[0018] Third, traditional equipment has a complex structure and is prone to failure. This equipment has a compact and reasonable structure, and each component cooperates closely. Through sensors and a reasonable mechanical structure, the equipment can be operated stably, reducing the risk of damage to the battery cell caused by mechanical failure and improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 is a side view of the present invention;

[0021] Figure 3 It is a three-dimensional schematic diagram of the local structure of the present invention;

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure enlargement at point A;

[0023] Figure 5 The three-dimensional structure diagram of the lifting platform and the transfer conveyor belt of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 6 The three-dimensional structure diagram of the lifting platform and the transfer conveyor belt of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the hot pressing platform of the present invention;

[0026] Figure 8 The three-dimensional structure of the hot pressing platform and the lower mold of the carrier of the present invention is shown in FIG. Figure 1 ;

[0027] Fig. 9 The three-dimensional structure of the hot pressing platform and the lower mold of the carrier of the present invention is shown in FIG. Figure 2 ;

[0028] Fig.10 yes Fig. 9 A schematic diagram of the structure at B in FIG.

[0029] The numbers in the figure are: 1-carrier lower mold; 2-fixed upper mold; 3-battery cell; 4-transport conveyor belt; 5-lifting device; 6-lifting platform; 7-vertical frame; 8-hot pressing platform; 9-transfer conveyor belt; 10-inclined lifting plate; 11-avoidance; 12-long side plate; 13-limit baffle; 14-expansion guide; 15-double-rod guide rail; 16-single-axis cylinder; 17-double-hole slider; 18-reinforced connector; 19-L-type traction part; 20-movable carrier; 21-rectangular bracket; 22-vertical rail; 23-embedded; 24-fixed baffle; 25-side clamp; 26-short-stroke small cylinder; 27-small conveyor belt; 28-rectangular through hole; 29-strip through hole; 30-L-type connector. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Reference Figures 1 to 10As shown, a battery cell preheating and hot pressing integrated equipment includes a hot pressing mold for batch hot pressing battery cells 3, a transport conveyor belt 4 and a lifting device 5 arranged at the end of the transport conveyor belt 4, the hot pressing mold includes a carrier lower mold 1 and a fixed upper mold 2, the lifting device 5 has a lifting platform 6, a vertical frame 7 is arranged on the side of the lifting device 5 away from the transport conveyor belt 4, a plurality of hot pressing platforms 8 stacked and arranged in a longitudinal layer and a guide mechanism for limiting the movement direction of the hot pressing platform 8 to the vertical direction are arranged on the vertical frame 7, a transfer conveyor belt 9 and a push mechanism for driving the transfer transmission belt to move horizontally toward the vertical frame 7 are arranged on the lifting platform 6, and inclined lifting plates 10 for squeezing into between two adjacent hot pressing platforms 8 are arranged on both sides of one end of the transfer transmission belt facing the hot pressing platform 8, and a clamping mechanism for clamping the hot pressing carrier of the battery cell 3 is arranged on the hot pressing platform 8, and a fixed upper mold 2 is installed at the bottom of all hot pressing platforms 8 except the bottom layer.

[0032] Working principle: The core components of the equipment include hot pressing molds, a transport conveyor belt 4, a lifting device 5, a vertical frame 7, a hot pressing platform 8 and a guide mechanism. In the previous process, the carrier lower mold 1 filled with cylindrical rolled battery cells 3 is sent to the lifting device 5 via the transport conveyor belt 4. The lifting platform 6 is lowered to the lowest level to receive the carrier lower mold 1, only one at a time. Before receiving, the horizontal push mechanism makes the transfer conveyor belt 9 close to the transport conveyor belt 4; when receiving, the lifting platform 6 adjusts its height, and the horizontal push mechanism drives the transfer conveyor belt 9 to move toward the hot pressing platform 8, and its inclined lifting plate 10 lifts the hot pressing platform 8 stacked above. The transfer conveyor belt 9 sends the carrier lower mold 1 to the hot pressing platform 8, and the clamping mechanism positions and clamps it. Then the horizontal push mechanism pulls out the inclined lifting plate 10, the hot pressing platform 8 falls, and the carrier lower mold 1 is molded with the fixed upper mold 2. After all the batteries are loaded in place, the contact points on the bottom of the carrier lower mold 1 and the contact electrodes on the hot pressing platform 8 are energized to heat the built-in heating module, thereby preheating and hot pressing the battery cells 3. A hydraulic or electric pressure holding device for applying downward pressure can be installed on the top of the vertical frame 7 as needed, or a counterweight can be placed on the topmost hot pressing platform 8 for pressure holding according to production requirements.

[0033] Effects achieved: Batch hot pressing of cylindrical rolled cells 3 is achieved, manual intervention is reduced, labor intensity, human errors and defective rates are reduced, and the integrated design reduces the equipment footprint and saves production space.

[0034] The length of the transfer transmission belt is less than that of the lifting platform 6. The lifting platform 6 is a rectangular frame structure. Both ends of the lifting platform 6 along the length direction of the transfer conveyor belt 9 are formed with avoidance openings 11 for avoiding the transfer conveyor belt 9. Long side panels 12 are fixedly provided on both sides of the transfer conveyor belt 9. The top of the long side panels 12 is provided with a limit baffle 13 located above the edge of the transfer transmission belt for limiting the lateral deviation of the carrier lower mold 1. The limit baffle 13 is formed with a flaring guide portion 14 toward one end of the transport conveyor belt 4, which is conducive to the smooth entry of the carrier lower mold 1.

[0035] Problem to be solved: The lower mold 1 of the carrier is prone to lateral deviation during transfer, resulting in failure to accurately enter the hot pressing platform 8 or collision damage during transfer.

[0036] Working principle: The transfer belt is shorter than the lifting platform 6 and is placed in the rectangular frame of the lifting platform 6. There are avoidance openings 11 at both ends. The long side plates 12 on both sides are provided with limit baffles 13, and one end is provided with an expansion guide 14. When the carrier lower mold 1 is transferred from the transport conveyor belt 4 to the transfer conveyor belt 9, the expansion guide 14 guides it to enter, and the limit baffle 13 limits the lateral deviation to ensure accurate transmission to the specified position of the hot pressing platform 8.

[0037] Effect achieved: Improve the transmission accuracy and stability of the carrier lower mold 1, reduce equipment failures and product damage caused by deviation, and improve production continuity and product quality.

[0038] The push mechanism includes two groups of double-rod guide rails 15 and single-axis cylinders 16 symmetrically arranged on both sides of the transfer conveyor belt 9 in the length direction. The double-rod guide rails 15 are located below the transfer conveyor belt 9. Each of the double-rod guide rails 15 is provided with a double-hole slider 17. Each of the double-hole sliders 17 is fixedly connected to the outer middle part of the corresponding long side plate 12 through a reinforcing connecting piece 18. The two single-axis cylinders 16 are respectively fixedly arranged on the top of both sides of the lifting platform 6, and each single-axis cylinder 16 is located above the corresponding double-rod guide rails 15. An L-shaped traction piece 19 is fixedly connected to the output shaft of the single-axis cylinder 16, and the lower end of the L-shaped traction piece 19 is fixedly connected to the side of the double-hole slider 17 away from the reinforcing connecting piece 18.

[0039] Problem to be solved: How to achieve stable and precise horizontal movement of the transfer conveyor belt 9, accurately deliver the carrier lower mold 1 to the hot pressing platform 8, and control the movement of the inclined lifting plate 10.

[0040] Working principle: The horizontal push mechanism consists of two sets of double-rod guide rails 15 and single-axis cylinders 16 symmetrically arranged on both sides of the transfer conveyor belt 9. The double-rod guide rails 15 are below the transfer conveyor belt 9, and the double-hole slider 17 is connected to the long side plate 12 through the reinforcing connector 18. The single-axis cylinder 16 is located at the top of both sides of the lifting platform 6 and above the double-rod guide rails 15, and its output shaft is connected to the double-hole slider 17 through an L-shaped traction member. When the single-axis cylinder 16 is working, it pulls the double-hole slider 17 to drive the transfer conveyor belt 9 to move horizontally along the double-rod guide rails 15, so as to realize the pushing of the carrier lower mold 1 and the in and out of the inclined lifting plate 10.

[0041] Effect achieved: Accurately control the transfer conveyor belt 9 and the horizontal push action, so that the carrier lower mold 1 accurately reaches the specified position of the hot pressing platform 8, providing guarantee for the hot pressing process and improving the automation degree and production efficiency of the equipment.

[0042] The hot pressing platform 8 includes a movable platform 20 arranged in a horizontal state and a rectangular bracket 21 fixedly arranged at the bottom of the movable platform 20. The guiding mechanism includes four vertical rails 22 fixedly arranged on the vertical frame 7. The four corners of the rectangular bracket 21 are slidably connected to the four vertical rails 22 respectively.

[0043] Problem to be solved: During the hot pressing process, the hot pressing platform 8 needs to move up and down stably and ensure accurate position to ensure consistent hot pressing effect.

[0044] Working principle: The hot pressing platform 8 is composed of a movable platform 20 and a bottom rectangular bracket 21. The guide mechanism includes four vertical rails 22 fixed on the vertical frame 7, and the four corners of the rectangular bracket 21 are slidably connected to the vertical rails 22, so that the hot pressing platform 8 can only move in the vertical direction, ensuring stable and accurate movement when the inclined lifting plate 10 is lifted and lowered.

[0045] The achieved effect is: ensuring that the hot pressing platform 8 moves stably in the vertical direction, making the hot pressing process more reliable, improving the hot pressing accuracy and consistency, and improving the hot pressing quality of the battery cell 3.

[0046] The bottoms of both ends of the rectangular bracket 21 are provided with inlays 23 for the tip of the inclined lifting plate 10 to slide into. When the inclined lifting plate 10 is fully inserted into the inlays 23, the corresponding lower edge of the rectangular bracket 21 is higher than the upper edge of the battery cell 3 in the lower mold 1 of the carrier on the transfer conveyor belt 9.

[0047] Problem to be solved: To realize the smooth transfer of the carrier lower mold 1 from the transfer conveyor belt 9 to the hot pressing platform 8, and the automatic lifting and closing of the hot pressing platform 8.

[0048] Working principle: There are inlays 23 at the bottom of both ends of the rectangular bracket 21. The inclined lifting plate 10 on the transfer conveyor 9 moves horizontally under the action of the horizontal push mechanism, and the tip is embedded in the inlay 23. The rectangular bracket 21 is lifted up by continuing to move, so that the hot pressing platform 8 is raised. When the inclined lifting plate 10 is fully inserted into the inlay 23, the lower edge of the rectangular bracket 21 is higher than the upper edge of the battery cell 3, which is convenient for the transfer of the carrier lower mold 1. When the horizontal push mechanism pulls out the inclined lifting plate 10, the hot pressing platform 8 falls down to close the mold.

[0049] Effect achieved: Automatic and smooth transfer of the lower mold 1 of the carrier and automatic mold closing of the hot pressing platform 8 are achieved, which reduces manual operation, improves production efficiency, and reduces the risk of damage to the battery cell 3 caused by manual transfer and mold closing.

[0050] The clamping mechanism includes a fixed baffle 24 and two side clamps 25 that can move toward each other. The fixed baffle 24 is fixedly set at the top of the movable platform 20 at one end away from the transfer conveyor belt 9. The two side clamps 25 are symmetrically arranged at the top of both sides of the movable platform 20. A short-stroke small cylinder 26 fixed to the bottom of the movable platform 20 is arranged below both ends of each side clamp 25. The output shafts of the short-stroke small cylinder 26 are respectively connected to the ends of the corresponding side clamps 25. When the fixed baffle 24 and the two side clamps 25 jointly clamp the carrier lower mold 1, the carrier lower mold 1 corresponds to the fixed upper mold 2 above.

[0051] Problem to be solved: During the hot pressing process, it is necessary to ensure that the position of the hot pressing carrier of the battery cell 3 is fixed to avoid displacement affecting the hot pressing effect. For the cylindrical rolled battery cell 3, ensure its stable positioning in the hot pressing tank.

[0052] Working principle: A position sensor is provided on one side of the movable carrier 20 near the transfer conveyor belt 9. When the carrier lower mold 1 moves to the specified position near the fixed baffle 24 on the movable carrier 20 under the conveyance of the small conveyor belt 27, the position sensor detects a signal and feeds back to the control system. The clamping mechanism consists of a fixed baffle 24 and two side clamps 25 that can move toward each other. The fixed baffle 24 is at the top of the movable carrier 20 away from the end of the transfer conveyor belt 9, and the two side clamps 25 are symmetrically located at the top of both sides and driven by a short-stroke small cylinder 26 at the bottom of the movable carrier 20. After receiving the position sensor signal, the control system triggers the short-stroke small cylinder 26 to work, push the side clamps 25 to move toward each other, and clamp the carrier lower mold 1 together with the fixed baffle 24, so that it corresponds to the upper fixed mold 2. Because the carrier lower mold 1 and the fixed upper mold 2 have semi-cylindrical hot pressing grooves, the cylindrical rolled battery cell 3 is stably positioned.

[0053] Effect achieved: ensuring the stability of the carrier lower mold 1 and the battery cell 3 during the hot pressing process, allowing the battery cell 3 to receive hot pressing at an accurate position, improving the hot pressing accuracy and quality, and reducing the problem of poor hot pressing caused by displacement of the carrier and the battery cell 3.

[0054] A small conveyor belt 27 is fixedly provided at the bottom of the movable platform 20. The small conveyor belt 27 is arranged at the bottom of one end of the movable platform 20 close to the transfer conveyor belt 9. A rectangular through hole 28 is opened on the movable platform 20 for allowing the small conveyor belt 27 to leak upward.

[0055] Problem to be solved: Ensure that after the carrier lower mold 1 is transferred from the transfer conveyor belt 9 to the movable carrier 20 , it can continue to move forward until it is pressed against the fixed blocking bar 24 to complete accurate positioning on the movable carrier 20 .

[0056] Working principle: A small conveyor belt 27 is fixed at one end of the bottom of the movable platform 20 near the transfer conveyor belt 9, and a rectangular through hole 28 is provided on the movable platform 20 for it to leak upward. When the carrier lower mold 1 enters the movable platform 20 from the transfer conveyor belt 9, the small conveyor belt 27 starts to convey the bottom of the carrier lower mold 1. The small conveyor belt 27 continues to run, pushing the carrier lower mold 1 forward on the movable platform 20 until the carrier lower mold 1 is pressed against the fixed stop bar 24, completing the positioning action on the movable platform 20, and preparing for the subsequent clamping and hot pressing process of the clamping mechanism.

[0057] Effect achieved: The lower mold 1 of the carrier is accurately positioned on the movable carrier 20, and the clamping mechanism and the hot pressing process are coordinated to improve the stability and accuracy of the overall hot pressing process and ensure the hot pressing quality.

[0058] The movable platform 20 is provided with a plurality of strip-shaped through holes 29 perpendicular to the side clamping strips 25 , and each end of the side clamping strip 25 is fixedly connected with an L-shaped connector 30 that passes downward through the strip-shaped through hole 29 and is connected to the output shaft of the short-stroke small cylinder 26 .

[0059] Problem to be solved: In order to ensure that the side clamping strip 25 moves accurately and stably, its connection structure needs to be reasonably designed.

[0060] Working principle: There are several strip-shaped through holes 29 perpendicular to the side clamping strips 25 on the movable carrier 20. The end of each side clamping strip 25 passes through the strip-shaped through hole 29 downward through an L-shaped connector and is connected to the output shaft of the short-stroke small cylinder 26. When the short-stroke small cylinder 26 is driven, the side clamping strips 25 can accurately move toward or away from each other along the direction of the strip-shaped through hole 29 to achieve the clamping and loosening of the carrier lower mold 1.

[0061] The effect achieved is: ensuring the accuracy and stability of the movement of the side clamping strip 25, making the clamping mechanism work reliably, improving the clamping effect of the carrier lower mold 1, and further ensuring the stability and quality of the hot pressing process.

[0062] The carrier lower mold 1 and the fixed upper mold 2 both have built-in heating modules. Contacts for connecting the heating modules are arranged on the bottom surface of the carrier lower mold 1 , and contact electrodes for supplying power to the contacts are arranged on the hot pressing platform 8 .

[0063] Problem to be solved: During the hot pressing process of the battery cell 3, how to provide a stable and reliable heating source for the hot pressing mold to ensure accurate temperature control during the hot pressing process to meet the hot pressing requirements of the cylindrical rolled battery cell 3.

[0064] Working principle: Both the carrier lower mold 1 and the fixed upper mold 2 have built-in heating modules. The bottom surface of the carrier lower mold 1 has contacts connected to the heating module, and there are contact electrodes on the hot pressing platform 8. After the carrier lower mold 1 is transferred to the hot pressing platform 8 and is tightly held, the contact electrodes contact the contacts to supply power to the heating module, so that the carrier lower mold 1 and the fixed upper mold 2 are heated, and the cylindrical rolled battery cell 3 is preheated and hot pressed using the semi-cylindrical hot pressing groove.

[0065] Effect achieved: Accurate temperature control of the preheating and hot pressing process of the cylindrical rolled battery cell 3 is achieved, which is beneficial to improving the hot pressing quality of the battery cell 3, improving the performance and consistency of the battery cell 3, and meeting the demand for producing high-quality battery cells 3.

[0066] A height sensor is installed on the lifting device 5 of the lifting platform 6. When the carrier lower mold 1 on the transport conveyor belt 4 reaches the receiving position of the lifting platform 6, the height sensor detects the current position information and feeds back to the control system. According to the preset program, the control system controls the lifting platform 6 to descend to a height flush with the transport conveyor belt 4 to receive the carrier lower mold 1. When transferring the carrier lower mold 1 to the hot pressing platform 8, the height sensor monitors the height of the lifting platform 6 in real time to ensure that it rises to a suitable height that enables the inclined lifting plate 10 to smoothly lift the hot pressing platform 8 and the carrier lower mold 1 can be accurately transferred to the hot pressing platform 8. After the hot pressing is completed, the height sensor works again to control the lifting platform 6 to descend to a suitable height to facilitate the delivery of the carrier lower mold 1 after hot pressing.

[0067] The achieved effect is to ensure the accurate movement of the lifting platform 6, to ensure the smooth transfer of the carrier lower mold 1 between various processes, to improve the stability and reliability of equipment operation, and to improve the overall production efficiency.

[0068] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An integrated device for preheating and hot pressing of battery cells, comprising a hot pressing mold for hot pressing battery cells in batches, a conveyor belt, and a lifting device arranged at the end of the conveyor belt, wherein the hot pressing mold comprises a carrier lower mold and a fixed upper mold, and the lifting device has a lifting platform, characterized in that: A vertical frame is arranged on the side of the lifting device away from the transport conveyor belt, and a plurality of hot pressing platforms stacked and movable in a longitudinal layer are arranged on the vertical frame, and a guide mechanism for limiting the movable direction of the hot pressing platform to the vertical direction is arranged. A transfer conveyor belt and a push mechanism for driving the transfer conveyor belt to move horizontally toward the vertical frame are arranged on the lifting platform. An inclined lifting plate for squeezing into between two adjacent hot pressing platforms is arranged on both sides of one end of the transfer conveyor belt facing the hot pressing platform. A clamping mechanism for clamping the hot pressing carrier of the battery cell is arranged on the hot pressing platform. A fixed upper mold is installed at the bottom of all hot pressing platforms except the bottom one. The length of the transfer belt is less than that of the lifting platform. The lifting platform is a rectangular frame structure. Both ends of the lifting platform along the length direction of the transfer belt are formed with avoidance openings for avoiding the transfer belt. Long side plates are fixedly provided on both sides of the transfer belt. A limit baffle plate located above the edge of the transfer belt is provided on the top of the long side plate for limiting the lateral deviation of the carrier lower mold. The limit baffle plate is formed toward one end of the transport conveyor belt to facilitate the smooth entry of the carrier lower mold. The horizontal pushing mechanism includes two groups of double-rod guide rails and single-axis cylinders symmetrically arranged on both sides of the transfer conveyor belt in the length direction. The double-rod guide rails are located below the transfer conveyor belt. Each double-rod guide rail is provided with a double-hole slider. Each double-hole slider is fixedly connected to the outer middle part of the corresponding long side plate through a reinforcing connecting piece. The two single-axis cylinders are respectively fixedly arranged on the top of both sides of the lifting platform, and each single-axis cylinder is located above the corresponding double-rod guide rail. An L-shaped traction piece is fixedly connected to the output shaft of the single-axis cylinder, and the lower end of the L-shaped traction piece is fixedly connected to the side of the double-hole slider away from the reinforcing connecting piece.

2. The integrated battery preheating and hot pressing device according to claim 1, characterized in that: The hot pressing platform includes a movable platform arranged in a horizontal state and a rectangular bracket fixedly arranged at the bottom of the movable platform. The guide mechanism includes four vertical rails fixedly arranged on the vertical frame. The four corners of the rectangular bracket are respectively slidably connected to the four vertical rails.

3. The integrated battery preheating and hot pressing device according to claim 2, characterized in that: The bottoms of both ends of the rectangular bracket are provided with slots for the tip of the inclined lifting plate to slide into. When the inclined lifting plate is fully inserted into the slots, the lower edge of the corresponding rectangular bracket is higher than the upper edge of the battery cell in the lower mold of the carrier on the transfer conveyor.

4. The integrated battery preheating and hot pressing device according to claim 2, characterized in that: The clamping mechanism includes a fixed baffle and two side clamps that can move toward each other. The fixed baffle is fixedly set at the end of the top of the movable platform away from the transfer conveyor belt. The two side clamps are symmetrically set at the top of both sides of the movable platform. Short-stroke small cylinders fixed to the bottom of the movable platform are set below both ends of each side clamp. The output shafts of the short-stroke small cylinders are respectively connected to the ends of the corresponding side clamps. When the fixed baffle and the two side clamps jointly clamp the lower mold of the carrier, the lower mold of the carrier corresponds to the fixed upper mold above.

5. The integrated battery preheating and hot pressing device according to claim 4, characterized in that: A small conveyor belt is fixedly arranged at the bottom of the movable platform. The small conveyor belt is arranged at the bottom of one end of the movable platform close to the transfer conveyor belt. A rectangular through hole is opened on the movable platform for the small conveyor belt to leak upward.

6. The integrated battery preheating and hot pressing device according to claim 4, characterized in that: The movable platform is provided with a plurality of strip-shaped through holes perpendicular to the side clamping strips, and the end of each side clamping strip is fixedly connected with an L-shaped connector which passes through the strip-shaped through hole downward and is connected to the output shaft of the short-stroke small cylinder.

7. The integrated battery preheating and hot pressing device according to claim 1, characterized in that: Both the carrier lower mold and the fixed upper mold have built-in heating modules. Contacts for connecting to the heating modules are arranged on the bottom surface of the carrier lower mold, and contact electrodes for supplying power to the contacts are arranged on the hot pressing platform.

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