Lithium ion battery cold and hot press core machine

Abstract

The utility model discloses a kind of lithium ion battery cold and hot pressing core machine, including base, fixed transmission unit is equipped on base, the unit is sequentially arranged hot pressing unit and cold pressing unit along transmission direction, and hot pressing unit feed end is equipped with laser thickness measuring unit.Fixed transmission unit contains horizontal transmission mechanism and battery fixed assembly of battery core body bearing, ensure that core body sequentially pass through hot pressing and cold pressing unit.Battery fixed assembly includes vacuum adsorption bottom plate, limit block, fine adjustment sliding block and cylinder clamping assembly with elastic contact pressure plate, realize lossless precision fixation.Hot pressing unit contains upper pressing plate, heating plate, lower pressing cylinder and guide column.Cold pressing unit contains circulating heat conduction plate, water-cooled plate and Z-axis drive assembly driven by elastic lower pressing assembly, wherein elastic lower pressing assembly has buffering protection function.The equipment realizes cold pressing immediately after hot pressing, improves efficiency and battery quality, guarantees thickness consistency and structural stability.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing equipment technology, and in particular to a lithium-ion battery hot and cold pressing machine. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, after the electrodes are stacked or wound to form a bare cell (or core), two key processes are required: hot pressing and cold pressing. Hot pressing primarily aims to use heat to melt or soften the binder inside the core, allowing the electrode active materials, conductive agents, binders, and interlayer bonding to be more tightly combined. This removes internal air bubbles, improves the cell's density, interfacial contact, and structural stability, thereby enhancing the battery's energy density and rate performance. Cold pressing, following hot pressing, primarily aims to rapidly shape and further compact the still-high-temperature cell at a lower temperature. This effectively "locks in" the structural form obtained through hot pressing, preventing problems such as springback, delamination, or uneven thickness caused by stress release and temperature gradients during natural cooling, ensuring the final cell's thickness consistency and structural stability.

[0003] Currently, the industry commonly uses separate, independent equipment for hot and cold pressing operations: after the battery cell is hot-pressed, operators or robotic arms need to move it to the cold pressing station. This handling process is time-consuming, causing the hot battery cell to be exposed to air and its temperature to drop significantly, resulting in structural instability. The handling process carries risks of vibration, collision, or placement misalignment, which may damage the battery cell (especially the edge electrodes) or cause misalignment during cold pressing, affecting the cold pressing effect. Existing patents, such as CN202405384U, provide a fully automatic hot and cold pressing machine for battery cells that integrates a conveyor belt, cold pressing mold, and hot pressing mold into a single device. While external cold and hot pressing cylinders and pressure sensors ensure reliable operation, they cannot achieve precise fixing and positioning of the battery cell. Therefore, there is an urgent need to develop an integrated device that can efficiently, continuously, and automatically complete the hot and cold pressing processes, safely, stably, and accurately fix and press the battery cell, and effectively monitor the battery cell quality to solve the aforementioned problems of existing technologies. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a lithium-ion battery hot and cold pressing machine.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a lithium-ion battery hot and cold pressing machine, comprising a base, on which a fixed transmission unit is provided. The fixed transmission unit has a hot pressing unit and a cold pressing unit arranged sequentially along a horizontal transmission direction. A laser thickness measuring unit is fixed to the feed end of the hot pressing unit. The fixed transmission unit includes a horizontal transmission mechanism and a battery fixing assembly fixed thereon, configured to carry the battery core and allow it to pass sequentially through the hot pressing unit and the cold pressing unit. The hot pressing unit includes an upper pressure plate, a heating plate, and a lower pressure cylinder that drives the upper pressure plate. The heating plate is connected to the pressure plate fixing plate via a heat insulation plate, and the driving end of the lower pressure cylinder is connected to the pressure plate fixing plate. The cold pressing unit includes a circulating heat-conducting plate, a water-cooled plate located below the circulating heat-conducting plate, and a Z-axis drive assembly that drives the circulating heat-conducting plate via an elastic lower pressure assembly.

[0007] As a preferred embodiment of this utility model, the battery fixing assembly includes: a vacuum adsorption base plate with negative pressure adsorption holes distributed on its surface; a position adjustment slide connected between the vacuum adsorption base plate and the horizontal transmission mechanism; at least two sets of symmetrically arranged limiting blocks fixed to the upper surface of the vacuum adsorption base plate and extending along the length direction of the battery core; a fine-tuning sliding block slidably connected to the horizontal transmission mechanism and in contact with one side of the battery core; and a cylinder clamping assembly located on the opposite side of the fine-tuning sliding block and abutting against the other side of the battery core.

[0008] As a preferred technical solution of this utility model, the cylinder clamping assembly includes a horizontal thrust cylinder and an elastic contact pressure plate disposed at the end of its piston rod, the working surface of which is covered with a high-temperature resistant buffer layer.

[0009] As a preferred embodiment of this utility model, the horizontal transmission mechanism includes: at least one horizontal guide rail; a horizontal lead screw arranged parallel to the horizontal guide rail; a drive motor, the output end of which is connected to the horizontal lead screw via a coupling; and a lead screw nut, which is fixed to the bottom of the battery fixing assembly and meshes with the horizontal lead screw.

[0010] As a preferred embodiment of this utility model, the hot pressing unit further includes four guide columns, which are symmetrically distributed on both sides of the pressing cylinder and penetrate the pressure plate fixing plate and slide with it.

[0011] As a preferred embodiment of this utility model, the elastic pressing component includes: a pressing block fixed to the bottom of the circulating heat-conducting plate; a vertically arranged pressing slide rail slidably connected to the pressing block; a spring clamping rod passing through the pressing block and having clearance fit with it; and a buffer cylinder whose piston rod is connected to the pressing block and drives it to move along the pressing slide rail.

[0012] As a preferred embodiment of the present invention, the spring clamping rod includes a pressure adjusting nut and a compression spring sleeved on the rod body, wherein the pressure adjusting nut is located below the lower pressure block, and the compression spring is pre-compressed between the pressure adjusting nut and the lower pressure block to form a buffer gap.

[0013] As a preferred technical solution of this utility model, the water-cooled plate is embedded with a serpentine cooling water channel, and the two ends of the cooling water channel are respectively connected to the cooling water inlet and the cooling water outlet.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. After hot pressing, the cell temperature has not dropped significantly before it is transferred to the cold pressing unit for compaction and shaping, effectively suppressing the thermal shrinkage and springback effect of the cell. The cold pressing process, under controlled conditions, quickly "locks in" the tight structure formed by hot pressing, ensuring the cell thickness consistency, structural density, and good contact between the interfaces of each layer, ultimately improving the energy density and cycle life of the battery;

[0016] 2. The battery fixing assembly integrates a vacuum adsorption base plate, limiting block, position adjustment slide, fine-tuning sliding block, and cylinder clamping assembly. This combination design enables non-damaging, adaptive, firm, and precise fixing of various battery cells during transmission and pressing, preventing displacement or damage during pressing, especially protecting the edge structure of the battery cells;

[0017] 3. The four symmetrically arranged guide pillars in the hot pressing unit, in conjunction with the downward pressing cylinder, ensure the verticality and stability of the upper pressure plate during pressing, preventing pressure deviation and ensuring uniform distribution of hot pressing pressure. The elastic downward pressing component of the cold pressing unit provides flexible and controllable clamping force through the synergistic action of the buffer cylinder, compression spring, and downward pressing slide rail. This effectively compacts the cooled and contracted battery cells while buffering impacts, preventing damage to the diaphragm or adhesive, which becomes more brittle in the cold state, due to hard contact, thus improving the yield of finished products. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is the front view of this utility model;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4This is a schematic diagram of the hot-pressing unit in this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the fixed transmission unit in this utility model;

[0024] In the diagram: 1. Base; 2. Fixed transmission unit; 3. Hot pressing unit; 4. Cold pressing unit; 5. Laser thickness measuring unit; 21. Horizontal transmission mechanism; 22. Battery fixing assembly; 31. Upper pressure plate; 32. Heating plate; 33. Heat insulation plate; 34. Pressure plate fixing plate; 35. Lower pressure cylinder; 36. Guide column; 41. Water-cooled plate; 42. Circulating heat conduction plate; 43. Elastic lower pressure assembly; 44. Z-axis drive assembly; 211. Horizontal lead screw; 212. Horizontal guide rail; 213. Drive... 214. Drive motor; 221. Lead screw nut; 222. Vacuum adsorption base plate; 223. Position adjustment slide; 224. Limit block; 225. Fine adjustment slide block; 226. Cylinder clamping assembly; 411. Cooling water inlet; 412. Cooling water outlet; 431. Lowering block; 432. Lowering slide rail; 433. Spring clamping rod; 434. Buffer cylinder; 435. Pressure adjusting nut; 436. Compression spring; 2251. Horizontal thrust cylinder; 2252. Elastic contact pressure plate. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] In the attached diagram, all identical reference numerals refer to the same components.

[0027] Example 1: As Figure 1-5 As shown, this utility model provides a lithium-ion battery hot and cold pressing machine, which mainly includes a base 1, a fixed transmission unit 2, a hot pressing unit 3, a cold pressing unit 4, and a laser thickness measurement unit 5.

[0028] Base 1: As the basic support platform for the whole machine, it is usually made of sturdy steel by welding or casting.

[0029] Fixed transmission unit 2: Fixed to the upper surface of base 1, responsible for accurately conveying battery cells along the horizontal transmission direction. It consists of a horizontal transmission mechanism 21 and a battery fixing assembly 22.

[0030] The horizontal transmission mechanism 21 includes at least one horizontal guide rail 212; a horizontal lead screw 211 parallel to the horizontal guide rail 212; a drive motor 213, the output shaft of which is fixedly connected to one end of the horizontal lead screw 211 via a rigid coupling; and a lead screw nut 214, fixed to the bottom of the battery fixing assembly 22 and meshing with the horizontal lead screw 211. The drive motor 213 drives the horizontal lead screw 211 to rotate, causing the lead screw nut 214 and the battery fixing assembly 22 fixed thereto to perform precise linear reciprocating motion along the horizontal guide rail 212.

[0031] Battery fixing assembly 22: Fixed to the lead screw nut 214 of the horizontal transmission mechanism 21, used to support and reliably fix the battery cell to be pressed. It includes:

[0032] Vacuum adsorption base plate 221: The upper surface is machined with densely distributed negative pressure adsorption holes, and the internal cavity is connected to an external vacuum pump (not shown) through a pipeline. After the vacuum pump is started, the negative pressure generated by the adsorption holes firmly adsorbs the core onto the surface of the base plate, providing uniform bottom support and preventing the core from wrinkling during the pressing process.

[0033] Position adjustment slide 222: It is connected by screws between the bottom of the vacuum adsorption base plate 221 and the lead screw nut 214 of the horizontal transmission mechanism 21. The slide 222 has manual fine-tuning functions in the X and Y directions, which are used to accurately calibrate the position of the battery fixing assembly 22 relative to the subsequent hot pressing unit 3 and cold pressing unit 4 to ensure that the pressing is centered.

[0034] At least two sets of symmetrically arranged limiting blocks 223 are vertically fixed to both sides of the upper surface of the vacuum adsorption base plate 221 by screws. The inner side of the limiting block 223 is a smooth vertical surface, extending along the length direction of the battery core, and is used to limit the position of the two sides of the core in the Y-axis direction.

[0035] Fine-tuning slider 224: It is slidably connected to the horizontal transmission mechanism 21 in the Y-axis direction via a slide rail slider assembly. The inner side of the fine-tuning slider 224 is provided with a guide surface or a small guide wheel, which contacts one side of the core to be placed. Its position can be finely adjusted manually or through a small stroke adjustment device to accommodate cores of different widths or minor deviations in core placement.

[0036] Cylinder clamping assembly 225: Located on the opposite side of the fine-tuning sliding block 224. It includes a horizontal thrust cylinder 2251 and an elastic contact plate 2252 located at the end of its piston rod. The working surface of the elastic contact plate 2252 is covered with a high-temperature resistant buffer layer. When the horizontal thrust cylinder 2251 extends, it drives the elastic contact plate 2252 to press against the other side (long side) of the core. Under the combined action of the high-temperature resistant buffer layer and the fine-tuning sliding block 224, the core is elastically clamped, preventing it from loosening during transmission and pressing. The buffer layer protects the edges of the core from rigid compression damage.

[0037] Laser thickness measurement unit 5: Fixedly installed at the feed end of hot pressing unit 3 (along the horizontal transmission direction, adjacent to the inlet side of hot pressing unit 3) via a bracket. It includes a high-precision laser emitter and receiver, used for non-contact measurement of the thickness of various points of the battery cell before entering hot pressing, with an accuracy of ±0.01mm, providing data for quality screening or process monitoring.

[0038] Hot pressing unit 3: Located on the transmission path of fixed transmission unit 2, adjacent to the output end of laser thickness measurement unit 5. It includes: Upper pressure plate 31: Its lower pressure surface is a smooth, high-temperature resistant metal plate, directly contacting the upper surface of the core to apply pressure and heat. Heating plate 32: Fixedly installed close to the upper surface of upper pressure plate 31, with an embedded heating tube or heating wire, its temperature precisely controlled by an external temperature controller (not shown). Heating plate 32 conducts heat to the upper pressure plate 31 in close contact with it. Insulation plate 33: Usually made of low thermal conductivity ceramic fiber board or mica board, fixed to the upper surface of heating plate 32 with high-temperature adhesive or countersunk screws. Pressure plate fixing plate 34: Fixed to the upper surface of insulation plate 33 with screws, usually a thicker steel plate. Insulation plate 33 effectively blocks the transfer of heat from heating plate 32 to pressure plate fixing plate 34. Lower pressure cylinder 35: Usually a large-diameter cylinder with a stroke of 100-300mm. The cylinder body is fixed to the frame above the base 1, with its piston rod pointing downwards. The end of the piston rod is fixedly connected to the center of the upper surface of the pressure plate fixing plate 34 via a flange or threaded connection. The downward pressing cylinder 35 provides the driving force required for pressing. Guide posts 36 are symmetrically distributed on both sides of the downward pressing cylinder 35. The upper end of the guide post 36 is fixed to the frame, and the lower end passes through the corresponding light hole on the pressure plate fixing plate 34, allowing the pressure plate fixing plate 34 and the entire upper pressing assembly to slide up and down along the guide post 36. The guide post 36 ensures vertical stability during the descent of the upper pressure plate 31 and uniform distribution of the pressing force.

[0039] Cold pressing unit 4: Located adjacent to the outlet end of hot pressing unit 3 on the transmission path of fixed transmission unit 2. Includes: Water-cooled plate 41: Fixed to the support structure above base 1. It has internally machined serpentine cooling water channels with rectangular or circular cross-sections. The two ends of the channels are connected to cooling water inlet 411 and cooling water outlet 412 respectively, allowing cooling water to circulate for cooling. Circulating heat-conducting plate 42: Typically made of a high thermal conductivity material, it is arranged parallel to the water-cooled plate 41 directly above. Its lower surface is in close contact with the upper surface of the water-cooled plate 41, efficiently conducting away heat from above. Its upper surface is flat and smooth, used to press the lower surface of the cooling core. Elastic pressing assembly 43: Used to drive the circulating heat-conducting plate 42 downwards, absorbing impact and accommodating the core's cooling contraction. Includes: Pressing block 431: Fixed to the bottom center or symmetrical position of the circulating heat-conducting plate 42 by screws. Pressing slide rail 432: Two (or more) vertically installed, with the guide surface facing the pressing block 431. A slider (unlabeled) is installed at the corresponding position of the pressure block 431, forming a sliding pair with the pressure slide rail 432, ensuring that the pressure block 431 and the circulating heat conduction plate 42 connected to it can only move linearly up and down along the Z-axis.

[0040] Spring clamping rod 433: Contains a rigid rod (such as an optical axis) that vertically penetrates the central through-hole of the lower pressure block 431. The upper end of the rod is fixed to the frame crossbeam. The rod and the central through-hole of the lower pressure block 431 are clearance-fitted (approximately 0.05-0.2mm), allowing the lower pressure block 431 to float slightly relative to the rod under pressure (in the Y-axis direction). Pressure adjusting nut 435: Tightly fitted onto the rod of the spring clamping rod 433, located below the lower pressure block 431. Compression spring 436: Fitted onto the outside of the rod of the spring clamping rod 433, located between the lower pressure block 431 and the pressure adjusting nut 435, in a pre-compressed state (the preload can be changed by tightening the adjusting nut 435).

[0041] Buffer cylinder 434: Typically a small cylinder, its body is fixed to the frame, with the piston rod pointing downwards. The end of the piston rod is connected to the upper surface of the lower pressure block 431 via a spherical bearing or a floating joint. The buffer cylinder 434 drives the lower pressure block 431 (along with the circulating heat-conducting plate 42) to move downwards along the lower pressure slide rail 432 to contact and press against the core. At the moment of pressing or when the core contracts, the compression spring 436 provides flexible buffering pressure through the lower pressure block 431.

[0042] Z-axis drive assembly 44: Fixed to the frame, its output end is connected to the top of the buffer cylinder 434 of the elastic pressing assembly 43. The Z-axis drive assembly 44 can be a long-stroke cylinder or a servo electric cylinder, used to provide the main Z-axis lifting power, driving the entire elastic pressing assembly 43 and the circulating heat conduction plate 42 to rise or fall to the set working position. In the pressing state, the Z-axis drive assembly 44 transmits the initial pressure to the buffer cylinder 434, and then to the circulating heat conduction plate 42; the spring system provides subsequent flexible buffering.

[0043] The method of using this utility model is as follows:

[0044] 1. The battery core is placed on the vacuum adsorption base plate 221 of the battery fixing assembly 22 and fixed by vacuum adsorption. At the same time, it is limited by the limiting block 223 and elastically clamped by the cylinder clamping assembly 225 and the fine-tuning sliding block 224. The horizontal transmission mechanism 21 drives the battery fixing assembly 22 to transport the core to the area below the laser thickness measuring unit 5 for thickness detection. After passing the thickness test, it is further sent to the area below the hot pressing unit 3.

[0045] 2. The lowering cylinder 35 drives the entire upper pressing assembly to press down along the guide column 36. The heated upper pressing plate 31 hot-presses the core at a set temperature (e.g., 90°C) and pressure. After completion, the upper pressing assembly is lifted, and the horizontal transmission mechanism 21 immediately moves the hot core under the cold pressing unit 4. The Z-axis drive assembly 44 drives the elastic lowering assembly 43 and the circulating heat-conducting plate 42 to press down. The circulating heat-conducting plate 42 presses down on the upper surface of the core, and the cold water circulation in the water-cooling plate 41 quickly removes heat. At the same time, the compression spring 436 provides a stable and gentle pressing force to compact and shape the cooling core.

[0046] 3. After cold pressing is completed, the Z-axis drive assembly 44 lifts the circulating heat conduction plate 42, and the core is conveyed to the next station.

[0047] Example 2: Based on the structure of Example 1, this example particularly emphasizes the optimized adaptation of the battery fixing assembly 22:

[0048] Vacuum adsorption base plate 221: In addition to evenly distributed adsorption holes, additional adsorption hole groups are set near the four corners and the center of the core to enhance the adsorption force on large or easily deformable cores. Position adjustment slide 222: Adopts a precision cross roller slide, with an adjustment resolution of up to 0.02mm / division and greater locking force. Limiting blocks 223: The number can be increased to three sets, and a thin layer of soft anti-scratch pad (such as 0.5mm thick PTFE) is attached to the inside. Cylinder clamping assembly 225: The high-temperature resistant buffer layer of the elastic contact pressure plate 2252 is made of 1-2mm thick silicone rubber sheet, and its Shore hardness can be selected in the range of A30-A50, providing better cushioning and sealing protection. Horizontal thrust cylinder 2251 can be a double-rod cylinder or a cylinder with built-in magnetic ring position feedback to monitor the clamping status in the control system. The thrust of the horizontal thrust cylinder 2251 can be set to a small value, mainly relying on vacuum suction for fixation. Fine-tuning slider 224: A locking handle can be added to lock the position after adjustment.

[0049] Example 3: Based on the structure of Example 1, this example particularly emphasizes the cooling efficiency and pressure control of the cold pressing unit 4:

[0050] Water-cooled plate 41: Its serpentine cooling channel cross-sectional area is optimized, with the inlet water velocity set at 1.5-2.5 m / s and the water pressure maintained at 0.1-0.3 MPa to ensure enhanced turbulence and heat transfer. Circulating heat-conducting plate 42: Approximately 15-20 mm thick, with a hard chrome plating treatment to improve wear resistance. Its contact surface with the water-cooled plate 41 ensures a flatness ≤0.05 mm / m. Elastic downward pressure assembly 43: Compression spring 436: A cylindrical helical compression spring is selected, with the wire diameter selected according to the required force value. The pre-compression amount is set by the pressure adjusting nut 435. Buffer cylinder 434: A cylinder with an external adjustable hydraulic buffer is selected, and a precision pressure regulating valve and flow control valve are added to the air circuit, allowing for adjustable and slow downward speed, forming a double buffer protection with the spring buffer. Clearance fit: The clearance between the spring clamping rod 433 and the hole of the downward pressure block 431 is maintained at approximately 0.1 mm to ensure flexibility while preventing excessive swaying. Z-axis drive assembly 44: A high-precision servo electric cylinder is selected here, with a repeatability of ±0.02mm. The servo electric cylinder achieves precise control of the pressing speed curve and holding pressure through control system programming (for example, the pressing is divided into two stages: the fast advance speed is 50mm / s, and before contacting the core, it switches to the slow advance speed of 5mm / s to make contact; during the holding stage, the Z-axis position is kept constant, and the pressure is maintained by the elastic pressing assembly 43).

[0051] This embodiment is particularly suitable for battery cells with complex structures, fragile edges, or thin thickness, as it allows for more precise fixing and a lower risk of damage.

[0052] This utility model is a lithium-ion battery hot and cold pressing machine, which is particularly suitable for the cell forming process of lithium-ion batteries with high requirements for thickness consistency and energy density. It is an important piece of equipment for improving battery performance and yield.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lithium-ion battery hot and cold pressing machine, comprising a base (1), characterized in that: The base (1) is provided with a fixed transmission unit (2), which is provided with a hot pressing unit (3) and a cold pressing unit (4) in sequence along the horizontal transmission direction; a laser thickness measuring unit (5) is fixed at the feeding end of the hot pressing unit (3); the fixed transmission unit (2) includes a horizontal transmission mechanism (21) and a battery fixing assembly (22) fixed thereon, which is configured to carry the battery core and allow it to pass through the hot pressing unit (3) and the cold pressing unit (4) in sequence; the hot pressing unit (3) is provided with a fixed transmission unit (21) and a laser thickness measuring unit (5) fixed at the feeding end of the hot pressing unit (3); the fixed transmission ... 3) Includes an upper pressure plate (31), a heating plate (32), and a lower pressure cylinder (35) that drives the upper pressure plate (31). The heating plate (32) is connected to the pressure plate fixing plate (34) through a heat insulation plate (33). The driving end of the lower pressure cylinder (35) is connected to the pressure plate fixing plate (34). The cold pressing unit (4) includes a circulating heat-conducting plate (42), a water-cooled plate (41) located below the circulating heat-conducting plate (42), and a Z-axis driving assembly (44) that drives the circulating heat-conducting plate (42) through the elastic lower pressure assembly (43).

2. The lithium-ion battery hot and cold pressing machine according to claim 1, characterized in that, The battery fixing assembly (22) includes: a vacuum adsorption base plate (221) with negative pressure adsorption holes distributed on its surface; a position adjustment slide (222) connected between the vacuum adsorption base plate (221) and the horizontal transmission mechanism (21); at least two sets of symmetrically arranged limiting blocks (223) fixed on the upper surface of the vacuum adsorption base plate (221) and extending along the length of the battery core; a fine-tuning sliding block (224) slidably connected to the horizontal transmission mechanism (21) and in contact with one side of the battery core; and a cylinder clamping assembly (225) located on the opposite side of the fine-tuning sliding block (224) and abutting against the other side of the battery core.

3. The lithium-ion battery hot and cold pressing machine according to claim 2, characterized in that, The cylinder clamping assembly (225) includes a horizontal thrust cylinder (2251) and an elastic contact plate (2252) located at the end of its piston rod. The working surface of the elastic contact plate (2252) is covered with a high-temperature resistant buffer layer.

4. The lithium-ion battery hot and cold pressing machine according to claim 1, characterized in that, The horizontal transmission mechanism (21) includes: at least one horizontal guide rail (212); a horizontal lead screw (211) arranged parallel to the horizontal guide rail (212); a drive motor (213), the output end of which is connected to the horizontal lead screw (211) via a coupling; and a lead screw nut (214), which is fixed to the bottom of the battery fixing assembly (22) and meshes with the horizontal lead screw (211).

5. A lithium-ion battery hot and cold pressing machine according to claim 1, characterized in that, The hot pressing unit (3) also includes four guide pillars (36), which are symmetrically distributed on both sides of the pressing cylinder (35) and pass through the pressure plate fixing plate (34) and slide with it.

6. The lithium-ion battery hot and cold pressing machine according to claim 1, characterized in that, The elastic pressing assembly (43) includes: a pressing block (431) fixed to the bottom of the circulating heat-conducting plate (42); a vertically arranged pressing slide rail (432) slidably connected to the pressing block (431); a spring clamping rod (433) passing through the pressing block (431) and clearance-fitting it; and a buffer cylinder (434) whose piston rod is connected to the pressing block (431) and drives it to move along the pressing slide rail (432).

7. The lithium-ion battery hot and cold pressing machine according to claim 6, characterized in that, The spring clamping rod (433) includes a pressure adjusting nut (435) and a compression spring (436) sleeved on the rod body. The pressure adjusting nut (435) is located below the lower pressure block (431), and the compression spring (436) is pre-pressed between the pressure adjusting nut (435) and the lower pressure block (431) to form a buffer gap.

8. The lithium-ion battery hot and cold pressing machine according to claim 1, characterized in that, The water-cooled plate (41) has a serpentine cooling channel embedded inside, with the cooling water inlet (411) and cooling water outlet (412) connected at both ends.

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