Vacuum baking device for lithium battery production

Abstract

The invention relates to the technical field of battery manufacturing, in particular to a vacuum baking device for lithium battery production, which comprises a vacuum baking cabinet and a baking jig arranged in the vacuum baking cabinet, the baking jig comprises a base plate and a heating plate arranged at the bottom of the base plate, heat conducting plate groups are arranged on the base plate at equal intervals, and the heating plate groups are arranged on the base plate at equal intervals. A heat conduction bin used for clamping the lithium battery in the thickness direction of the lithium battery is formed between every two adjacent heat conduction plate sets, each heat conduction plate set comprises fixed plates and a sliding plate, the fixed plates are arranged on the base plate at equal intervals, and the sliding plates are in sliding connection with the fixed plates; the distance between the adjacent heat conduction plate sets can be adjusted at equal intervals through the shear fork telescopic frame, so that lithium batteries with different thicknesses can be clamped, meanwhile, the heat conduction plate set with the adjustable height can be formed by the fixed plate and the sliding plate, and the problem that baking is uneven when an existing heat conduction plate cannot adapt to the lithium batteries with different heights is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a vacuum baking device for lithium battery production. Background Art

[0002] During lithium battery production, key components such as electrodes and cells undergo a rigorous vacuum baking process to remove moisture and organic solvents. This prevents issues such as bloating and electrolyte decomposition during use, which can affect battery performance and safety. Traditional vacuum baking equipment often uses contact heating, inserting lithium batteries between evenly spaced heat-conducting plates and utilizing heat conduction from the plates to achieve uniform heating of the batteries.

[0003] Currently, common heat transfer plate heating systems are typically made of metal (such as aluminum alloy). The heat transfer plate is heated by an external heat source (such as an electric heating pipe or oil heat circulation), and then the heat is transferred to the battery through direct contact. The heat transfer plates of existing contact baking devices are typically designed with fixed spacing, which only accommodates a small range of lithium battery thicknesses. If the thickness of the lithium battery varies significantly (such as switching from the thick cells of power batteries to the thin cells of consumer batteries), the baking device must be mechanically adjusted or the heat transfer plate must be replaced, resulting in high replacement costs and reduced production efficiency.

[0004] Patent document publication number CN110567237B discloses a battery baking device. The device includes a baking base having a storage space for accommodating batteries; a heating plate configured as a heat source for baking the batteries; and a separator. The heating plate and separator are spaced apart from each other on the baking base, with the heating plate arranged in a direction that intersects with the separator to divide the storage space into subspaces for accommodating at least one battery. At least one heating plate and at least one separator are movably mounted on the baking base to expand and contract the subspace enclosed by the heating plate and separator.

[0005] This device can accommodate the baking needs of lithium batteries of varying thicknesses by adjusting the spacing between adjacent heating plates. However, when the battery's height is greater than the height of the heating plate itself, its upper portion will extend beyond the heating zone, resulting in uneven heating and affecting the overall drying effect and quality consistency of the battery. Conversely, when the battery's height is less than the height of the heating plate, the battery's position relative to the heating plate is lower, which not only hinders heat concentration but also complicates loading and unloading operations, increasing the complexity of manual intervention and automated equipment, thereby impacting production efficiency and equipment versatility. Summary of the Invention

[0006] In response to the problems existing in the existing technology, a vacuum baking device for lithium battery production is provided. The spacing between adjacent heat conduction plate groups can be adjusted at equal intervals through a scissor-type telescopic frame, so that lithium batteries of different thicknesses can be clamped. At the same time, a heat conduction plate group composed of a fixed plate and a sliding plate can be formed into an adjustable height, solving the problem of uneven baking caused by the inability of existing heat conduction plates to adapt to lithium batteries of different heights.

[0007] To solve the problems of the prior art, the present invention provides a vacuum baking device for lithium battery production, comprising a vacuum baking cabinet and a baking jig arranged in the vacuum baking cabinet, the baking jig comprising a base plate and a heating plate arranged at the bottom of the base plate, heat conduction plate groups are arranged at equal intervals on the base plate, and heat conduction chambers for clamping lithium batteries along the thickness direction of the lithium batteries are formed between adjacent heat conduction plate groups, the heat conduction plate groups comprising fixed plates and sliding plates, the fixed plates are arranged at equal intervals on the base plate, and the sliding plates are slidably connected to the fixed plates, during the loading process, the sliding plate approaches the base plate relative to the fixed plate so that the height of the heat conduction chamber is less than the height of the lithium battery; during the baking process, the sliding plate moves away from the base plate relative to the fixed plate so that the height of the heat conduction chamber is the same as the height of the lithium battery.

[0008] Preferably, the end of the fixed plate facing away from the base plate is provided with comb-tooth grooves at equal intervals, and the end of the sliding plate facing the base plate is provided with comb-tooth keys staggered with the comb-tooth grooves at equal intervals.

[0009] Preferably, a sliding adjustment component is further provided on the base plate and is transmission-connected to the sliding plate. The sliding adjustment component has an adjustment portion capable of raising and lowering the sliding plate relative to the fixed plate.

[0010] Preferably, the bottom end of the sliding plate is provided with an abutment rod extending into the fixed plate, the adjusting portion includes an adjusting shaft and a cam, the adjusting shaft is rotatably arranged on the base plate, the adjusting shaft passes through the fixed plate and rotatably cooperates with it, the cam is rotatably arranged in the fixed plate and its eccentric shaft is connected to the adjusting shaft, and the abutment rod abuts against the contour surface of the cam.

[0011] Preferably, an elastic reset assembly is provided between the sliding plate and the fixed plate, and the abutment rod elastically abuts against the contour surface of the cam.

[0012] Preferably, the elastic reset assembly includes a connecting rod and an elastic reset element, the connecting rod is longitudinally arranged at both ends of the bottom of the sliding plate, and mounting openings are provided on both sides of the fixed plate. The bottom end of the connecting rod extends into the mounting opening and is provided with a limit card, and the elastic reset element is sleeved on the connecting rod, and the elastic reset element is located between the top of the mounting opening and the limit card.

[0013] Preferably, a fixed side plate is provided on an opposite side of the base plate, one end of the adjusting shaft passes through the fixed side plate and is provided with a limiting ring, a fixing ring coaxial with the adjusting shaft is provided on the fixed side plate, a tooth groove is provided on the outer circumferential surface of the fixing ring, a locking sleeve is provided on the adjusting shaft to form a spline connection therewith, internal spline teeth meshing with the tooth grooves are provided on the inner circumferential surface of the locking sleeve, and an elastic abutment element is provided between the locking sleeve and the limiting ring.

[0014] Preferably, a roller is provided at the bottom end of the abutment rod, and the abutment rod is in rolling engagement with the contour surface of the cam.

[0015] Preferably, a fixed side plate is provided on an opposite side of the base plate, and the heat conducting plate group is located between the two fixed side plates, wherein an adjustment plate is provided on the side of one fixed side plate facing the heat conducting plate group, and a scissor-type telescopic frame is provided on the outer side of the adjustment plate and the other fixed side plate, the heat conducting plate group is slidably provided on the base plate, and the heat conducting plate group is connected to the central pivot of the scissor-type telescopic frame.

[0016] Preferably, a screw rod is provided on the fixed side plate and is vertically connected to the fixed side plate through a thread, and the screw rod is elastically connected to the adjustment plate.

[0017] Compared with the prior art, the present invention has the following advantages: This application utilizes a scissor-type telescopic frame to achieve equal spacing between adjacent heat transfer plate groups, effectively clamping lithium batteries of varying thicknesses and adapting to the processing needs of diverse product specifications. Furthermore, each heat transfer plate group is composed of a fixed plate and a sliding plate. The sliding structure allows for flexible vertical adjustment of the plate height, ensuring that the effective heating area of the heat transfer plate group covers the entire height range of the lithium battery.

[0018] This solves the compatibility issues faced by traditional heat-conducting plates when handling lithium batteries of varying heights, avoiding uneven local heating caused by insufficient heat-conducting area, thereby improving thermal treatment consistency and product yield. Furthermore, while ensuring thermal efficiency, this solution balances structural adjustability and ease of operation, contributing to a higher degree of automation and flexible production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view of a vacuum baking device for lithium battery production according to the present invention; Figure 2 This is a three-dimensional diagram of a baking jig in a vacuum baking device for lithium battery production according to the present invention, viewed from a first perspective; Figure 3 This is a three-dimensional diagram of a baking jig in a vacuum baking device for lithium battery production according to the present invention, viewed from a second perspective; Figure 4 This is a side view of a baking jig in a vacuum baking device for lithium battery production according to the present invention; Figure 5 This is a schematic diagram of a vacuum baking device for lithium battery production according to the present invention when a baking jig is separated from a lithium battery; Figure 6 This is a schematic diagram of a substrate and a heat conducting plate assembly in a vacuum baking device for lithium battery production according to the present invention; Figure 7 yes Figure 6 A local enlarged view of point A; Figure 8 yes Figure 6 A partial enlarged view of point B; Figure 9 This is a schematic diagram of the connection between the adjustment shaft and the fixed side plate in a vacuum baking device for lithium battery production according to the present invention; Figure 10 It is a three-dimensional exploded view of the connection structure between the adjustment shaft and the fixed side plate in a vacuum baking device for lithium battery production according to the present invention.

[0020] The numbers in the figure are: 1. Vacuum baking cabinet; 2. Baking fixture; 21. Base plate; 211. Fixed side plate; 2111. Fixed ring; 212. Adjusting plate; 213. Scissor telescopic frame; 214. Screw; 22. Heating plate; 23. Heat conducting plate group; 231. Fixed plate; 2311. Comb groove; 232. Sliding plate; 2321. Comb key; 2322. Abutment rod; 2323. Roller; 2331. Connecting rod; 2332. Elastic reset element; 2333. Limiting card; 241. Adjusting shaft; 2411. Limiting ring; 2412. Locking sleeve; 2413. Elastic abutment element; 242. Cam. DETAILED DESCRIPTION

[0021] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 and Figure 8As shown, a vacuum baking device for lithium battery production includes a vacuum baking cabinet 1 and a baking jig 2 arranged in the vacuum baking cabinet 1, the baking jig 2 includes a base plate 21 and a heating plate 22 arranged at the bottom of the base plate 21, and heat conduction plate groups 23 are arranged at equal intervals on the base plate 21. A heat conduction chamber for clamping the lithium battery along the thickness direction of the lithium battery is formed between adjacent heat conduction plate groups 23, and the heat conduction plate group 23 includes a fixed plate 231 and a sliding plate 232. The fixed plates 231 are arranged at equal intervals on the base plate 21, and the sliding plates 232 are slidably connected to the fixed plates 231. During the loading process, the sliding plate 232 is close to the base plate 21 relative to the fixed plate 231 so that the height of the heat conduction chamber is less than the height of the lithium battery; during the baking process, the sliding plate 232 is away from the base plate 21 relative to the fixed plate 231 so that the height of the heat conduction chamber is the same as the height of the lithium battery.

[0023] A vacuum baking device for lithium battery production comprises a vacuum baking cabinet 1 and a baking jig 2 disposed within the cabinet. The baking jig 2 comprises a base plate 21 and a heating plate 22 mounted at the bottom of the base plate 21, providing the required heat. Several heat transfer plate groups 23 are evenly spaced on the base plate 21. Adjacent heat transfer plate groups 23 form heat transfer compartments, which sandwich the lithium batteries along their thickness to ensure even heat transfer to both sides.

[0024] Each heat transfer plate assembly 23 consists of a fixed plate 231 and a sliding plate 232 slidably connected thereto. The fixed plates 231 are evenly mounted on the base plate 21, providing a stable positioning foundation. The sliding plates 232 can move vertically relative to the fixed plates 231, enabling dynamic adjustment of the heat transfer chamber height.

[0025] During the loading process, the sliding plate 232 moves closer to the substrate 21 relative to the fixed plate 231, so that the height of the heat transfer chamber is less than the actual height of the lithium battery, thereby facilitating the smooth insertion of the lithium battery into the heat transfer chamber and maintaining the initial clamping state; and during the baking process, the sliding plate 232 slides away from the substrate 21, so that the height of the heat transfer chamber is strictly consistent with the height of the lithium battery, ensuring that both sides of the lithium battery are heated evenly, thereby improving the efficiency and consistency of the heat treatment.

[0026] This structure not only overcomes the technical shortcomings of traditional baking devices that are difficult to adapt to lithium batteries of different heights, avoids uneven heat conduction caused by insufficient contact or insufficient pressing force, but also has good adjustability and adaptability, facilitating flexible and mass-produced automated production.

[0027] like Figure 7 and Figure 8As shown, the end of the fixed plate 231 away from the base plate 21 is provided with comb grooves 2311 at equal intervals, and the end of the sliding plate 232 facing the base plate 21 is provided with comb keys 2321 staggered with the comb grooves 2311 at equal intervals.

[0028] To achieve adjustable height for the heating chamber and ensure that the heat conducting plate assembly 23 maintains full contact with both sides of the lithium battery during baking for uniform heating, a number of comb-tooth grooves 2311 are evenly spaced on the end of the fixed plate 231 facing away from the base plate 21. The end of the sliding plate 232 facing the base plate 21 is correspondingly provided with comb-tooth keys 2321 that interlock with the comb-tooth grooves 2311. The plug-in connection between the comb-tooth grooves 2311 and the comb-tooth keys 2321 not only allows for vertical height adjustment of the sliding plate 232, but also maximizes the contact area between the fixed plate 231 and the sliding plate 232, ensuring uniform thermal conductivity of the heat conducting plate assembly 23 to the lithium battery.

[0029] After adjustment, the sliding plate 232 and the fixed plate 231 are respectively located on the upper and lower sides of the heating chamber, and the working surfaces of both can contact and fit with the surface of the lithium battery to form a sandwich heating structure, which effectively improves the heat conduction efficiency and improves the temperature field distribution, reducing the temperature difference gradient during the baking process.

[0030] like Figure 4 and Figure 5 As shown, the base plate 21 is further provided with a sliding adjustment component that is transmission-connected to the sliding plate 232 . The sliding adjustment component has an adjustment portion that can lift and lower the sliding plate 232 relative to the fixed plate 231 .

[0031] To achieve precise vertical adjustment of the sliding plate 232 relative to the fixed plate 231 to accommodate lithium batteries of varying thicknesses, the base plate 21 is further provided with a sliding adjustment assembly that is in transmission connection with the sliding plate 232. The sliding adjustment assembly includes an adjustment portion whose structural design enables it to drive the sliding plate 232 to move up and down relative to the fixed plate 231, thereby flexibly adjusting the clamping height of the heating chamber.

[0032] The adjustment unit can utilize a screw 214-nut mechanism, a cam 242 linkage, or an electric linear drive, combined with a drive shaft or guide rails to achieve stable, controllable, and repeatable precise positioning of the sliding plate 232. This structure allows an operator or automated control system to quickly adjust the height of the sliding plate 232 based on the actual height parameters of the lithium battery, ensuring that the heat transfer chamber cavity and the lithium battery thickness are precisely matched, ensuring that the heating surface is fully aligned with the battery surface, thereby improving heat transfer efficiency and temperature uniformity.

[0033] like Figure 7As shown, the bottom end of the sliding plate 232 is provided with an abutment rod 2322 extending into the fixed plate 231, and the adjusting portion includes an adjusting shaft 241 and a cam 242. The adjusting shaft 241 is rotatably set on the base plate 21, and the adjusting shaft 241 passes through the fixed plate 231 and rotates with it. The cam 242 is rotatably set in the fixed plate 231 and its eccentric shaft is connected to the adjusting shaft 241, and the abutment rod 2322 abuts against the contour surface of the cam 242.

[0034] The bottom end of the sliding plate 232 is provided with an abutment rod 2322 that extends downward and is inserted into the interior of the fixed plate 231, for receiving actuation from the sliding adjustment assembly. The sliding adjustment assembly comprises an adjustment shaft 241 and a cam 242. The adjustment shaft 241 is rotatably mounted on the base plate 21 and vertically extends through the fixed plate 231, forming a rotational engagement with the fixed plate 231.

[0035] The cam 242 is rotatably mounted within the fixed plate 231. Its main body is connected to the adjustment shaft 241 via an eccentric shaft, forming a linkage structure. Rotation of the adjustment shaft 241 drives the cam 242 to rotate eccentrically in sync, thereby changing the contact height between the cam 242 profile and the abutment rod 2322. The abutment rod 2322 continuously abuts against the profile of the cam 242, moving up and down as the cam 242 rotates, ultimately driving the sliding plate 232 to achieve fine-tuning movement vertically relative to the fixed plate 231.

[0036] This structure has the characteristics of compact structure, precise response, and high adjustment sensitivity. It is suitable for fast, stable and repeatable mechanical adjustment of the clamping height of the heating chamber according to the actual needs of lithium batteries of different thicknesses. It is particularly suitable for use in heating conditions that require mass production and compatibility with multiple specifications.

[0037] like Figure 8 As shown, an elastic reset assembly is provided between the sliding plate 232 and the fixed plate 231 , and the abutting rod 2322 elastically abuts against the contour surface of the cam 242 .

[0038] To ensure that the bottom end of the abutment rod 2322 remains firmly in contact with the contour of the cam 242 throughout the adjustment process, an elastic return assembly is provided between the sliding plate 232 and the fixed plate 231 to provide continuous and stable elastic pressure. This structure allows the abutment rod 2322 to maintain constant elastic pressure against the contour of the cam 242, maintaining smooth tracking even when the cam 242 profile changes height.

[0039] The elastic return assembly, which can take the form of a compression spring or elastic washer, is optimally positioned between the sliding plate 232 and the fixed plate 231. Its continuous return force gently presses the sliding plate 232 toward the fixed plate 231, thereby driving the abutment rod 2322 to apply a certain preload force to the cam 242 along its installation direction. This structural design not only effectively prevents contact loss due to play or vibration, but also improves the system's responsiveness and structural stability.

[0040] In this way, the abutment rod 2322 can achieve adaptive following and continuous contact in the contour changes caused by the rotation of the cam 242, avoiding separation, jumping or jamming during movement, thereby ensuring the continuity and accuracy of the sliding adjustment mechanism.

[0041] like Figure 8 As shown, the elastic reset assembly includes a connecting rod 2331 and an elastic reset element 2332. The connecting rod 2331 is longitudinally arranged at both ends of the bottom of the sliding plate 232. Mounting openings are provided on both sides of the fixed plate 231. The bottom end of the connecting rod 2331 extends into the mounting opening and is provided with a limit card 2333. The elastic reset element 2332 is sleeved on the connecting rod 2331. The elastic reset element 2332 is located between the top of the mounting opening and the limit card 2333.

[0042] To ensure that the bottom end of the abutment rod 2322 always closely adheres to the contoured surface of the cam 242, an elastic return assembly is provided between the sliding plate 232 and the fixed plate 231. This assembly comprises connecting rods 2331 and elastic return elements 2332. The connecting rods 2331 are longitudinally arranged at both ends of the bottom of the sliding plate 232 and pass through mounting openings on either side of the fixed plate 231. The bottom ends of the connecting rods 2331 extend into the mounting openings and are provided with limit stops 2333 to prevent the connecting rods 2331 from falling out.

[0043] The elastic reset element 2332 is a sleeve-like structure, sleeved outside the connecting rod 2331, with its upper and lower ends supported between the top of the mounting opening and the stopper 2333. This structure enables the elastic reset element 2332 to continuously push the connecting rod 2331 upward when under pressure, thereby pushing the sliding plate 232 toward the fixed plate 231, thereby exerting continuous elastic pressure on the abutting rod 2322, ensuring that its bottom end always maintains stable contact with the contoured surface of the cam 242.

[0044] like Figure 9 and Figure 10As shown, a fixed side plate 211 is provided on the opposite side of the base plate 21, one end of the adjusting shaft 241 passes through the fixed side plate 211 and is provided with a limiting ring 2411, the fixed side plate 211 has a fixing ring 2111 coaxial with the adjusting shaft 241, and the outer circumference of the fixing ring 2111 is provided with a tooth groove, the adjusting shaft 241 is provided with a locking sleeve 2412 forming a spline connection therewith, the inner circumference of the locking sleeve 2412 is provided with internal spline teeth meshing with the tooth groove, and an elastic abutment element 2413 is provided between the locking sleeve 2412 and the limiting ring 2411.

[0045] To achieve controlled rotation and secure locking of the adjustment shaft 241, a fixed side plate 211 is provided on one side of the base plate 21. One end of the adjustment shaft 241 passes through the fixed side plate 211, and a retaining ring 2411 is provided at the shaft end. A retaining ring 2111 is coaxially mounted on the fixed side plate 211, and its outer circumference is machined with teeth and grooves for engaging with the locking mechanism.

[0046] An axially movable locking sleeve 2412 is mounted on the exterior of the adjusting shaft 241 via a spline connection, ensuring that it rotates with the adjusting shaft 241 and can slide axially. The inner circumference of the locking sleeve 2412 is provided with an internal spline structure that matches the teeth of the retaining ring 2111. When locked, the locking sleeve 2412 engages with the retaining ring 2111 to achieve axial positioning and rotational locking of the adjusting shaft 241.

[0047] An elastic abutment element 2413 (such as a compression spring) is provided between the locking sleeve 2412 and the limiting ring 2411. When the locking sleeve 2412 is not pulled manually, the elastic element pushes it to the engaged position, so that the spline teeth in the locking sleeve 2412 are tightly engaged with the tooth grooves of the fixing ring 2111, thereby preventing the adjusting shaft 241 from rotating on its own in the non-operating state, ensuring that the cam 242 maintains the set angle.

[0048] When the height of sliding plate 232 needs to be adjusted, locking sleeve 2412 is pulled to overcome the force of the elastic element, disengaging it from the tooth groove of fixing ring 2111. Adjustment shaft 241 can then rotate freely, driving cam 242 to adjust its position. After adjustment is complete, locking sleeve 2412 is released. Pushed by the elastic element, it automatically resets and re-engages with fixing ring 2111, re-locking adjustment shaft 241 and preventing positional deviation caused by vibration or load disturbance.

[0049] like Figure 7 As shown, a roller 2323 is provided at the bottom end of the abutting rod 2322 , and the abutting rod 2322 is in rolling engagement with the contour surface of the cam 242 .

[0050] In order to reduce the friction between the abutment rod 2322 and the contour surface of the cam 242, a roller 2323 is provided at the bottom end of the abutment rod 2322. The roller 2323 is installed on the abutment rod 2322 through a low-friction bearing and forms a rolling fit with the contour surface of the cam 242, thereby significantly reducing sliding friction while maintaining good contact.

[0051] like Figure 4 As shown, a fixed side plate 211 is provided on an opposite side of the base plate 21, and the heat conducting plate group 23 is located between the two fixed side plates 211. An adjustment plate 212 is provided on the side of one fixed side plate 211 facing the heat conducting plate group 23. A scissor-type telescopic frame 213 is provided on the outer side of the adjustment plate 212 and the other fixed side plate 211. The heat conducting plate group 23 is slidably provided on the base plate 21, and the heat conducting plate group 23 is connected to the central pivot of the scissor-type telescopic frame 213.

[0052] The adjusting shaft 241 and the cam 242 form a spline connection. In order to adapt to lithium batteries of different thicknesses, the scissor-type telescopic frame 213 can adjust the spacing of the heat conducting plate group 23 to an equal spacing by adjusting the position of the adjusting plate 212. The heat conducting plate group 23 is slidably mounted on the base plate 21 and is located between the two fixed side plates 211. One side of the fixed side plate 211 facing the heat conducting plate group 23 is provided with an adjusting plate 212. The outer side of the adjusting plate 212 is connected to the scissor-type telescopic frame 213, and the central pivot of the scissor-type telescopic frame 213 is connected to each heat conducting plate group 23 to achieve synchronous drive. The adjusting shaft 241 and the cam 242 are connected by a spline. In the process of adjusting the spacing between the heat conducting plates, torque can be effectively transmitted to ensure smooth transmission and sensitive response, thereby realizing synchronous displacement adjustment of multiple groups of heat conducting plates and improving the adaptability and reliability of the structure to changes in battery cell thickness.

[0053] like Figure 4 As shown, a screw rod 214 is provided on the fixed side plate 211 and is vertically connected to the fixed side plate 211 and is threaded therewith. The screw rod 214 is elastically connected to the adjustment plate 212 .

[0054] In order to achieve reliable clamping and thermal conductivity efficiency for lithium batteries of different thicknesses, the system is provided with a vertically arranged screw rod 214 on the fixed side plate 211 and threadedly connected thereto. The end of the screw rod 214 facing the adjustment plate 212 is connected to the adjustment plate 212 through an elastic connection structure (such as a spring or a flexible element), so that the adjustment plate 212 can achieve precise displacement adjustment under the rotation drive of the screw rod 214 while having a certain buffering and rebound ability.

[0055] For example, the elastic connection method between the screw rod 214 and the adjustment plate 212 is as follows: a connecting seat is provided on the side of the adjustment plate 211 facing the screw rod, and the screw rod 214 slides through the connecting seat at one end facing the connecting seat. An inner retaining ring and an outer retaining ring are provided on the screw rod 214, and the connecting seat is located between the inner retaining ring and the outer retaining ring. A spring is provided between the connecting seat and the outer retaining ring. When the screw rod 214 is rotated, the outer retaining ring compresses the spring, so that the adjustment plate 212 drives the heat conducting plate group 23 to elastically clamp the lithium battery.

[0056] This structure ensures that the heat conducting plate group 23 can elastically clamp the battery cell after adjustment, and maintains good contact when the battery cell expands or deforms due to heat, avoiding the decrease in thermal conductivity or loosening of the structure due to changes in the gap, thereby improving the clamping stability and adaptability.

[0057] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and such modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the appended claims.

Claims

1. A vacuum baking device for lithium battery production, comprising a vacuum baking cabinet and a baking jig disposed in the vacuum baking cabinet, wherein the baking jig comprises a substrate and a heating plate disposed at the bottom of the substrate, characterized in that: Heat conduction plate groups are arranged at equal intervals on the substrate, and heat conduction chambers for clamping lithium batteries along the thickness direction of the lithium batteries are formed between adjacent heat conduction plate groups. The heat conduction plate groups include fixed plates and sliding plates. The fixed plates are arranged at equal intervals on the substrate, and the sliding plates are slidably connected to the fixed plates. During the loading process, the sliding plates are close to the substrate relative to the fixed plates so that the height of the heat conduction chamber is less than the height of the lithium batteries; during the baking process, the sliding plates are away from the substrate relative to the fixed plates so that the height of the heat conduction chamber is the same as the height of the lithium batteries.

2. A vacuum baking device for lithium battery production according to claim 1, characterized in that: The end of the fixed plate facing away from the base plate is provided with comb tooth grooves at equal intervals, and the end of the sliding plate facing the base plate is provided with comb tooth keys staggered with the comb tooth grooves at equal intervals.

3. A vacuum baking device for lithium battery production according to claim 1 or 2, characterized in that: The base plate is further provided with a sliding adjustment component that is transmission-connected to the sliding plate. The sliding adjustment component has an adjustment portion that can lift the sliding plate relative to the fixed plate.

4. The vacuum baking device for lithium battery production according to claim 3, characterized in that: The bottom end of the sliding plate is provided with an abutment rod extending into the fixed plate, and the adjusting portion includes an adjusting shaft and a cam. The adjusting shaft is rotatably provided on the base plate, and the adjusting shaft passes through the fixed plate and rotatably cooperates with it. The cam is rotatably provided in the fixed plate and its eccentric shaft is connected to the adjusting shaft, and the abutment rod abuts against the contour surface of the cam.

5. The vacuum baking device for lithium battery production according to claim 4, characterized in that: An elastic reset component is provided between the sliding plate and the fixed plate, and the abutting rod elastically abuts against the contour surface of the cam.

6. The vacuum baking device for lithium battery production according to claim 5, characterized in that: The elastic reset assembly includes a connecting rod and an elastic reset element. The connecting rod is longitudinally arranged at both ends of the bottom of the sliding plate. Mounting openings are provided on both sides of the fixed plate. The bottom end of the connecting rod extends into the mounting opening and is provided with a limit card. The elastic reset element is sleeved on the connecting rod and is located between the top of the mounting opening and the limit card.

7. The vacuum baking device for lithium battery production according to claim 4, characterized in that: A fixed side plate is provided on the opposite side of the base plate, one end of the adjusting shaft passes through the fixed side plate and is provided with a limiting ring, the fixed side plate has a fixing ring coaxial with the adjusting shaft, the outer circumferential surface of the fixing ring is provided with a tooth groove, the adjusting shaft is provided with a locking sleeve forming a spline connection therewith, the inner circumferential surface of the locking sleeve is provided with internal spline teeth meshing with the tooth grooves, and an elastic abutment element is provided between the locking sleeve and the limiting ring.

8. The vacuum baking device for lithium battery production according to claim 4, characterized in that: A roller is provided at the bottom end of the abutment rod, and the abutment rod is in rolling engagement with the contour surface of the cam.

9. The vacuum baking device for lithium battery production according to claim 4, characterized in that: A fixed side plate is provided on an opposite side of the base plate, and the heat conducting plate group is located between the two fixed side plates. An adjustment plate is provided on the side of one of the fixed side plates facing the heat conducting plate group, and a scissor-type telescopic frame is provided on the outer side of the adjustment plate and the other fixed side plate. The heat conducting plate group is slidably provided on the base plate, and the heat conducting plate group is connected to the central pivot of the scissor-type telescopic frame.

10. The vacuum baking device for lithium battery production according to claim 9, characterized in that: A vertical screw rod is provided on the fixed side plate and is threadedly connected thereto, and the screw rod is elastically connected to the adjustment plate.

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