Transition mechanism for placing battery cell on hot pressing table

Abstract

The utility model discloses a transition mechanism for placing a battery cell on a hot pressing table, which comprises a lifting seat, two groups of opening mechanisms are symmetrically mounted on the lifting seat, and a steel sheet is bridged between the two groups of opening mechanisms; each opening mechanism comprises a rotating arm and a first motor, and the rotating arm can be driven by the first motor to rotate relative to the lifting base. A sliding seat capable of controllably sliding along the rotating arm is mounted on the rotating arm, and a supporting roller is mounted on the sliding seat; a clamping mechanism for clamping the steel sheet is mounted at the end part of the rotating arm; the two opening mechanisms can be switched between two states; in a first state, the two rotating arms corresponding to the two opening mechanisms are both in a drooping vertical state; and in the second state, the two rotating arms are both in a horizontal state and are collinear. According to the utility model, the overall fatigue and abrasion of the mechanism are small, the replacement frequency of the steel sheets can be reduced, and the service life of the mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment for producing battery cores, in particular to a transition mechanism for placing battery cores on a hot pressing table. Background Art

[0002] The hot pressing process after cell stacking is a key step in the lithium-ion battery manufacturing process, and its importance cannot be underestimated. This process follows the precise stacking process and aims to optimize the battery structure and improve performance by applying precisely controlled temperature and pressure. The hot pressing process promotes a closer and more uniform contact between the positive and negative electrode materials and the separator layer, thereby shortening the conduction path of lithium ions inside the battery cell and improving the energy density and cycle stability of the battery.

[0003] This process not only ensures the uniformity of the thickness of the battery cell, but also reduces internal voids and enhances structural strength, which is crucial for preventing short circuits and improving safety. Hot pressing can also effectively improve the interface contact between the electrode and the diaphragm, promote full infiltration of the electrolyte, optimize electrochemical reaction conditions, and further enhance the battery's charging and discharging efficiency and service life. In addition, by reducing internal stress in the battery, hot pressing helps maintain the mechanical stability and electrical performance consistency of the battery under various working conditions, which is particularly critical for maintaining consistency in battery quality in large-scale production. In short, the hot pressing process is one of the core processes to ensure the high quality, high safety and long life of lithium-ion batteries.

[0004] In order to facilitate the handling of the battery cell by the manipulator and to ensure that the battery cell has a complete flat support under the hot pressing process, the applicant's prior application CN116315003A discloses a battery cell hot pressing device and a battery cell hot pressing method. In this scheme, the above purpose can be achieved by setting a transition mechanism and changing the length of the upper convex belt segment on the transition mechanism. In actual use, this scheme has the following disadvantages: after the manipulator grabs the battery cell onto the upper convex belt segment, the longer belt segment on the belt body undergoes a bending process during the relative movement of the two sets of guide wheel mechanisms, which not only increases the resistance of the two sets of guide wheel mechanisms to move away from each other, and increases the wear of the equipment, but also the belt body is prone to fatigue damage and needs to be replaced frequently, so the equipment life is relatively low. Utility Model Content

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a transition mechanism with low wear and long service life for placing a battery cell on a hot pressing table.

[0006] Technical solution: To achieve the above purpose, the utility model is a transition mechanism for placing a battery cell on a hot pressing table, which includes a lifting seat, on which two groups of spreading mechanisms are symmetrically mounted, and a steel sheet is bridged between the two groups of spreading mechanisms;

[0007] Each set of the spreading mechanism comprises a rotating arm and a first motor, and the rotating arm can be driven by the first motor to rotate relative to the lifting base;

[0008] The rotating arm is provided with a sliding seat which can controllably slide along the rotating arm, and the sliding seat is provided with a supporting roller;

[0009] A clamping mechanism for clamping the steel sheet is installed at the end of the rotating arm;

[0010] The two spreading mechanisms can switch between two states; in the first state, the two rotating arms corresponding to the two spreading mechanisms are both in a drooping vertical state; in the second state, the two rotating arms are both in a horizontal state and are collinear.

[0011] Furthermore, a second motor is installed on the rotating arm, a lead screw nut is installed on the sliding seat, an output shaft of the second motor is connected to a lead screw, and the lead screw cooperates with the lead screw nut spiral pair.

[0012] Furthermore, a slide rail is fixed on the rotating arm, and a sliding block slidably matched with the slide rail is fixed on the sliding seat.

[0013] In actual use, in the initial state, the two spreading mechanisms are in the first state, the steel sheet is bent into an inverted U-shaped structure, and the length of the portion of the steel sheet between the two support rollers is less than the length of the battery cell to be hot pressed, so that when the two claws of the manipulator that transports the battery cell place the battery cell on the top of the steel sheet, the claws will not encounter interference. After the manipulator is removed, the first motor rotates so that the relative state of the two groups of spreading mechanisms changes to the second state, and then the second motor of each spreading mechanism drives the corresponding sliding seat to slide through the lead screw, so that the support roller slides relative to the rotating arm, so that the distance between the two support rollers corresponding to the two groups of spreading mechanisms becomes larger, until the distance between the two support rollers is greater than the length of the hot pressing table. In this way, the lifting seat descends, so that the steel sheet can be supported by the hot pressing table, and the hot pressing operation can be carried out later.

[0014] Furthermore, when the relative state of the two spreading mechanisms is the first state, the support roller is arranged concentrically with the rotation center axis of the rotating arm where the support roller is located. In this way, when the relative state of the two spreading mechanisms changes from the first state to the second state, the height of the battery cell located on the upper side of the steel sheet does not change.

[0015] Furthermore, the clamping mechanism includes a fixing bar fixed relative to the rotating arm, and also includes a clamping block connected to the end of the steel sheet, and the clamping block can slide elastically relative to the fixing bar.

[0016] Furthermore, a plurality of guide columns connected to the clamping blocks are slidably mounted on the fixing bar, the ends of the guide columns are provided with stop shoulders, and a spring is provided between the stop shoulders and the fixing bar.

[0017] The above structure can not only keep the steel sheet in a taut state at all times, but also enable the end position of the steel sheet to be changed as needed when the relative states of the two spreading mechanisms are switched between the first state and the second state.

[0018] Beneficial effects: The transition mechanism for placing the battery cell on the hot pressing table of the utility model has the following beneficial effects:

[0019] (1) Compared with the prior application, the above structure does not encounter much resistance when the distance between the two support rollers increases, and the steel sheet does not need to withstand long-distance continuous bending. The overall fatigue and wear of the mechanism are relatively small, which can reduce the replacement frequency of the steel sheet and increase the service life of the mechanism.

[0020] (2) During the hot pressing process of the battery cell, the bottom of the battery cell is supported by a complete plane, which can ensure the hot pressing quality of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional structural diagram of a transition mechanism for placing a battery cell on a hot pressing table;

[0022] Figure 2 A side structural diagram of a transition mechanism for placing a battery cell on a hot press table;

[0023] Figure 3 The first state diagram of the process of transferring the battery cell to the hot press table;

[0024] Figure 4 A second state diagram of the process of transferring the battery cell to the hot press;

[0025] Figure 5 The third state diagram of the process of transferring the battery cell to the hot press table;

[0026] Figure 6 The fourth state diagram of the process of transferring the battery cell to the hot pressing table.

[0027] In the figure: 1-lifting seat; 2-opening mechanism; 21-rotating arm; 22-first motor; 23-sliding seat; 24-support roller; 25-clamping mechanism; 25a-fixing bar; 25b-clamping block; 25c-guide column; 25d-spring; 26-second motor; 27-screw nut; 28-screw; 29-slide rail; 210-slider; 3-steel sheet; 4-manipulator; 41-claw. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings.

[0029] like Figure 1-2 The transition mechanism shown is used to place the battery cell on the hot pressing table, which includes a lifting seat 1, on which two groups of spreading mechanisms 2 are symmetrically installed, and a steel sheet 3 is bridged between the two groups of spreading mechanisms 2.

[0030] Each set of the spreading mechanism 2 includes a rotating arm 21 and a first motor 22. The rotating arm 21 can be driven by the first motor 22 to rotate relative to the lifting seat 1; a sliding seat 23 that can slide controllably along the rotating arm 21 is installed, and a supporting roller 24 is installed on the sliding seat 23; a clamping mechanism 25 for clamping the steel sheet 3 is installed at the end of the rotating arm 21.

[0031] The two opening mechanisms 2 can be switched between two states; Figure 1 As shown, in the first state, the two rotating arms 21 corresponding to the two spreading mechanisms 2 are both in a drooping vertical state; Figure 4 As shown, in the second state, the two rotating arms 21 are both in a flat state and are collinear.

[0032] Specifically, a second motor 26 is mounted on the rotating arm 21, a lead screw nut 27 is mounted on the sliding seat 23, an output shaft of the second motor 26 is connected to a lead screw 28, and the lead screw 28 is screw-matched with the lead screw nut 27. A slide rail 29 is fixed on the rotating arm 21, and a slider 210 that is slidably matched with the slide rail 29 is fixed on the sliding seat 23.

[0033] In actual use, in the initial state, such as Figure 3 As shown, the two spreading mechanisms 2 are in the first state, the steel sheet 3 is bent into an inverted U-shaped structure, and the length of the portion of the steel sheet 3 between the two supporting rollers 24 is less than the length of the battery cell to be hot-pressed, so that when the two claws 41 of the manipulator 4 for transporting the battery cell place the battery cell on the top of the steel sheet 3, the claws 41 will not encounter interference. After the manipulator 4 is removed, the first motor 22 rotates so that the relative state of the two sets of spreading mechanisms 2 changes to the second state (as shown in FIG. Figure 4 Then, the second motor 26 of each spreading mechanism 2 drives the corresponding sliding seat 23 to slide through the lead screw 28, so that the support roller 24 slides relative to the rotating arm 21, so that the distance between the two support rollers 24 corresponding to the two groups of spreading mechanisms 2 increases, until the distance between the two support rollers 24 is greater than the length of the hot pressing table (as shown in FIG. Figure 5 In this way, the lifting seat 1 descends, so that the steel sheet 3 can be supported by the hot press table (as shown in FIG. Figure 6 As shown), hot pressing can be performed later.

[0034] Compared with the prior application, the above structure does not encounter much resistance when the distance between the two support rollers 24 increases, and the steel sheet 3 does not need to withstand long-distance continuous bending. The overall fatigue and wear of the mechanism are relatively small, which can reduce the replacement frequency of the steel sheet 3 and improve the service life of the mechanism.

[0035] During the hot pressing process of the battery cell, the bottom of the battery cell is supported by a complete plane, which can ensure the hot pressing quality of the battery cell.

[0036] When the relative state of the two spreading mechanisms 2 is the first state, the support roller 24 is arranged concentrically with the rotation center axis of the rotating arm 21 where it is located. In this way, when the relative state of the two spreading mechanisms 2 changes from the first state to the second state, the height of the battery cell located on the upper side of the steel sheet 3 does not change.

[0037] The clamping mechanism 25 includes a fixing bar 25a fixed relative to the rotating arm 21, and a clamping block 25b connected to the end of the steel sheet 3, and the clamping block 25b can slide elastically relative to the fixing bar 25a. A plurality of guide posts 25c connected to the clamping block 25b are slidably mounted on the fixing bar 25a, and the ends of the guide posts 25c have a stop shoulder, and a spring 25d is provided between the stop shoulder and the fixing bar 25a.

[0038] The above structure can not only keep the steel sheet 3 in a taut state at all times, but also change the end position of the steel sheet 3 as needed when the relative state of the two spreading mechanisms 2 is switched between the first state and the second state.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A transition mechanism for placing a battery cell on a hot pressing table, characterized in that: It comprises a lifting seat (1), on which two groups of spreading mechanisms (2) are symmetrically mounted, and a steel sheet (3) is bridged between the two groups of spreading mechanisms (2); Each set of the spreading mechanism (2) comprises a rotating arm (21) and a first motor (22), and the rotating arm (21) can be driven by the first motor (22) to rotate relative to the lifting seat (1); The rotating arm (21) is provided with a sliding seat (23) which can controllably slide along the rotating arm, and a supporting roller (24) is provided on the sliding seat (23); A clamping mechanism (25) for clamping the steel sheet (3) is installed at the end of the rotating arm (21); The two spreading mechanisms (2) are capable of switching between two states; in the first state, the two rotating arms (21) corresponding to the two spreading mechanisms (2) are both in a drooping vertical state; in the second state, the two rotating arms (21) are both in a horizontal state and are collinear.

2. The transition mechanism for placing a battery cell on a hot pressing table according to claim 1, characterized in that: A second motor (26) is mounted on the rotating arm (21), a lead screw nut (27) is mounted on the sliding seat (23), an output shaft of the second motor (26) is connected to a lead screw (28), and the lead screw (28) is in spiral engagement with the lead screw nut (27).

3. The transition mechanism for placing a battery cell on a hot pressing table according to claim 2, characterized in that: A slide rail (29) is fixed on the rotating arm (21), and a sliding block (210) that slidably cooperates with the slide rail (29) is fixed on the sliding seat (23).

4. The transition mechanism for placing a battery cell on a hot pressing table according to claim 1, characterized in that: When the relative state of the two spreading mechanisms (2) is the first state, the support roller (24) is arranged concentrically with the rotation center axis of the rotating arm (21) where it is located.

5. The transition mechanism for placing a battery cell on a hot pressing table according to claim 1, characterized in that: The clamping mechanism (25) comprises a fixing strip (25a) fixed relative to the rotating arm (21), and also comprises a clamping block (25b) connected to the end of the steel sheet (3), and the clamping block (25b) can slide elastically relative to the fixing strip (25a).

6. The transition mechanism for placing a battery cell on a hot pressing table according to claim 5, characterized in that: A plurality of guide columns (25c) connected to the clamping block (25b) are slidably mounted on the fixing strip (25a), the ends of the guide columns (25c) are provided with a stop shoulder, and a spring (25d) is provided between the stop shoulder and the fixing strip (25a).

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