A diaphragm hot pressing mechanism for a lithium battery cell

Abstract

This utility model discloses a hot-pressing mechanism for a lithium battery cell separator, comprising two sets of hot-pressing assemblies arranged horizontally and vertically opposite each other on a frame, and two sets of roller gap adjustment assemblies arranged horizontally and longitudinally on the frame. Each hot-pressing assembly includes a hot-pressing servo motor, a hot-pressing reducer, a first bearing seat, a pressure roller, and a second bearing seat, connected in sequence. The pressure roller has multiple sets of heating elements built into it, and an upwardly inclined iron block is provided on the bottom surface of the first and second bearing seats. The hot-pressing servo motor drives the hot-pressing reducer, which in turn drives the pressure roller to rotate, thereby heating and pressing the battery cell separator between the two pressure rollers. The roller gap adjustment assembly includes an adjustable pitch servo motor, an adjustable pitch reducer, an adjustable pitch bearing seat, a ball screw, and a downwardly inclined iron block, arranged in sequence. The downwardly inclined iron block is sleeved on the ball screw. The roller gap adjustment assembly adjusts the gap between the upper and lower sets of hot-pressing assemblies through the inclined surface cooperation principle of the upper and lower inclined iron blocks, realizing adjustable roller gap between the upper and lower pressure rollers and enhancing the applicability of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production equipment technology, and in particular to a diaphragm hot pressing mechanism for lithium battery cells. Background Technology

[0002] The cell separator is a porous thin film placed between the positive and negative electrodes of a lithium-ion battery. The cell separator is the "heart" of a lithium-ion battery. Its fundamental function is to physically isolate the positive and negative electrodes while allowing lithium ions to pass through freely, forming a charging and discharging circuit.

[0003] Please refer to the attached instructions. Figure 1 , attached Figure 1 This is a schematic diagram of the process of producing a good battery cell separator. The processing steps of the battery cell separator are as follows: First, the initial spacing between each tab on the electrode sheet is calculated based on parameters such as the winding radius and the number of winding layers. Then, the exposed copper foil or aluminum foil of an electrode sheet is cut into multiple tabs arranged at intervals according to the initial spacing. Next, the cut electrode sheet is wound so that the tabs of each turn are radially aligned. Finally, the electrode sheet is pressed into a battery cell through a cold pressing process.

[0004] Please refer to the attached instructions. Figure 2 , attached Figure 2 This is a schematic diagram of the process of producing defective battery cell separators. The alignment of the overlapping tabs wound on the battery cell in the radial direction is one of the important indicators for measuring the winding quality of the battery cell. Because multi-tab power batteries have a large number of tabs in the same cell, if the thickness of the separator in the cell is uneven, the alignment of the wound tabs cannot be guaranteed, which may lead to tab misalignment after cold pressing, ultimately making it impossible to produce standard battery cells.

[0005] Therefore, a hot-pressing mechanism is needed to ensure the consistency of the diaphragm thickness, thereby reducing the risk of electrode misalignment and improving the alignment of overlapping electrode arrangements. However, existing cell diaphragm hot-pressing mechanisms cannot easily adjust the gap between the hot-pressing rollers, resulting in poor applicability. Utility Model Content

[0006] In view of the shortcomings of the prior art, this utility model provides a diaphragm hot pressing mechanism for lithium battery cells to overcome the deficiencies in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A diaphragm hot pressing mechanism for a lithium battery cell includes a frame, a linear slide rail vertically arranged on the frame, and a slider correspondingly arranged on the linear slide rail;

[0009] The frame is also equipped with two sets of hot pressing components arranged horizontally and vertically opposite each other. The two sets of hot pressing components include an upper hot pressing component and a lower hot pressing component arranged vertically opposite each other. Each hot pressing component includes a hot pressing servo motor, a hot pressing reducer, a first bearing seat, a pressure roller and a second bearing seat connected in sequence. The pressure roller has multiple sets of heating tubes built in. The hot pressing servo motor drives the hot pressing reducer, which in turn drives the pressure roller to rotate, thereby heating and pressing the battery cell separator located between the upper and lower pressure rollers.

[0010] Furthermore, the frame is also equipped with two sets of roller gap adjustment components arranged longitudinally and horizontally at intervals, and the two sets of roller gap adjustment components are inserted between the two sets of hot pressing components at intervals; the two sets of roller gap adjustment components include a left roller gap adjustment component and a right roller gap adjustment component arranged left and right at intervals, and each roller gap adjustment component includes a pitch adjustment servo motor, a pitch adjustment reducer, a pitch adjustment bearing seat, a ball screw and a downward inclined iron block connected in sequence. The downward inclined iron block is sleeved on the ball screw and screwed to the ball screw; the pitch adjustment servo motor drives the pitch adjustment reducer and drives the ball screw to rotate, thereby driving the downward inclined iron block to translate along the axial direction of the ball screw.

[0011] Furthermore, a first inclined iron block and a second inclined iron block are respectively fixedly arranged on the bottom surface of the first bearing seat and the second bearing seat of the upper hot pressing assembly. The first inclined iron block and the second inclined iron block are used to cooperate with the roll gap adjustment assembly to adjust the roll gap spacing.

[0012] Furthermore, the lower inclined iron block of the left roll gap adjustment component is vertically corresponding to the first upper inclined iron block of the upper hot pressing component, and the inclined surfaces cooperate with each other; the lower inclined iron block of the right roll gap adjustment component is vertically corresponding to the second upper inclined iron block of the upper hot pressing component, and the inclined surfaces cooperate with each other.

[0013] Furthermore, the first bearing seat and the second bearing seat of the upper hot pressing assembly are respectively movably mounted on the slider of the linear slide rail via a connecting plate.

[0014] Furthermore, the first bearing seat and the second bearing seat of the lower hot pressing assembly are respectively fixedly mounted on the frame via connecting plates.

[0015] Furthermore, the pitch adjustment servo motors of the left and right roll gap adjustment components operate synchronously.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1) The lithium battery cell separator hot pressing mechanism in this case is equipped with two sets of hot pressing components. The separator is pre-heat-pressed by the hot pressing components to make the thickness of the separator uniform and consistent, thereby reducing the risk of electrode misalignment and improving the alignment of the overlapping electrode arrangement.

[0018] 2) The diaphragm hot pressing mechanism of the lithium battery cell in this case is equipped with two sets of roller gap adjustment components. The roller gap adjustment components adjust the gap between the upper and lower hot pressing components by means of the inclined surfaces of the upper and lower inclined iron blocks, so as to realize the roller gap between the upper and lower pressure rollers is adjustable and enhance the applicability of the equipment.

[0019] 3) The diaphragm hot pressing mechanism of the lithium battery cell in this case has a simple structure, low manufacturing and maintenance costs, and simple and convenient roller gap adjustment operation.

[0020] To provide a clearer understanding of this invention, the preferred embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process of processing the separator of a battery cell into a finished product in the background technology;

[0022] Figure 2 This is a schematic diagram of the process in the background technology where defective products are produced during the processing of the battery cell separator;

[0023] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the hot-pressing assembly of this utility model;

[0025] Figure 5 This is a schematic diagram of the roller gap adjustment assembly of this utility model;

[0026] Figure 6 This is a side view assembly diagram of this utility model.

[0027] Attached image labels:

[0028] 1-Frame, 2-Linear slide rail, 3-Hot pressing assembly, 4-Roll gap adjustment assembly, 3a-Upper hot pressing assembly, 3b-Lower hot pressing assembly, 4a-Left roll gap adjustment assembly, 4b-Right roll gap adjustment assembly; 31-Hot pressing servo motor, 32-Hot pressing reducer, 33-First bearing seat, 34-Pressure roller, 35-Second bearing seat, 351-Second upper inclined iron block; 41-Adjustable pitch servo motor, 42-Adjustable pitch reducer, 43-Adjustable pitch bearing seat, 44-Ball screw, 45-Lower inclined iron block. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] Furthermore, if terms such as "first" or "second" are used for descriptive purposes only, they are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, components or parts, and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] Please also refer to Figure 1-6 This utility model provides a lithium battery cell separator hot pressing mechanism, including a frame 1, a linear slide rail 2 vertically arranged on the frame 1, a slider 21 correspondingly arranged on the linear slide rail 2, two sets of hot pressing components 3 arranged horizontally and vertically opposite each other on the frame 1, and two sets of roller gap adjustment components 4 arranged horizontally and longitudinally at intervals on the frame 1, the two sets of roller gap adjustment components 4 being inserted between the two sets of hot pressing components 3; the two sets of hot pressing components 3 include an upper hot pressing component 3a and a lower hot pressing component 3b arranged vertically and vertically opposite each other, and each hot pressing component 3 includes a hot pressing servo motor 31, a hot pressing reducer 32, a first bearing seat 33, a pressure roller 34 and a second bearing seat 35 connected in sequence, the pressure roller 34 having multiple sets of heating tubes built in it; the hot pressing servo motor 31 drives the hot pressing reducer 32 to drive the pressure roller 34 to rotate, thereby heating and pressing the battery cell separator located between the upper and lower pressure rollers 34 to make the separator flat.

[0033] Furthermore, a first upper inclined iron block (not shown) and a second upper inclined iron block 351 are respectively fixedly arranged on the bottom surface of the first bearing seat 33 and the second bearing seat 35 of the upper hot pressing assembly 3a. The first upper inclined iron block and the second upper inclined iron block 351 are used to cooperate with the roll gap adjustment assembly 4 to adjust the gap between the upper pressure roller and the lower pressure roller.

[0034] Preferably, in this embodiment, the first bearing seat 33 and the second bearing seat 35 of the upper hot pressing assembly 3a are movably mounted on the slider 21 of the linear slide rail 2 via connecting plates, allowing the upper hot pressing assembly 3a to move up and down on the linear slide rail 2; the first bearing seat 33 and the second bearing seat 35 of the lower hot pressing assembly 3b are fixedly mounted on the frame 1 via connecting plates. Since the lower hot pressing assembly 3b is fixed on the frame 1, while the upper hot pressing assembly 3a is movably mounted on the slider 21 of the linear slide rail 2, the gap between the upper hot pressing assembly 3a and the lower hot pressing assembly 3b can be adjusted via the roller gap adjustment assembly 4.

[0035] In this embodiment, multiple sets of heating tubes are provided inside the pressure roller 34. The main purpose is to heat the surface of the battery cell separator by heating the heating tubes so that the surface of the battery cell separator is slightly melted. In this way, the pressure of the upper and lower pressure rollers causes the surface of the battery cell separator to deform, so as to ensure the consistency of the separator thickness after pressing.

[0036] The two sets of roll gap adjustment components 4 include a left roll gap adjustment component 4a and a right roll gap adjustment component 4b, which are arranged at left and right intervals. Each roll gap adjustment component 4 includes a pitch adjustment servo motor 41, a pitch adjustment reducer 42, a pitch adjustment bearing seat 43, a ball screw 44, and a downward inclined iron block 45, which are connected in sequence. The downward inclined iron block 45 is sleeved on the ball screw 44 and screwed to the ball screw 44. The pitch adjustment servo motor 41 drives the pitch adjustment reducer 42 and drives the ball screw 44 to rotate, thereby driving the downward inclined iron block 45 to translate along the axial direction of the ball screw 44.

[0037] Furthermore, the lower inclined iron block 45 of the left roll gap adjusting component 4a is vertically corresponding to the first upper inclined iron block of the upper hot pressing component 3a, and the inclined surfaces cooperate with each other; the lower inclined iron block 45 of the right roll gap adjusting component 4b is vertically corresponding to the second upper inclined iron block 351 of the upper hot pressing component 3a, and the inclined surfaces cooperate with each other.

[0038] The working principle of the roll gap adjustment component 4 is as follows:

[0039] The adjustable servo motor 41 drives the ball screw 44 to rotate, and the lower inclined block 45 moves laterally along the ball screw 44. The first and second upper inclined blocks 351 set on the upper hot pressing assembly 3a have a first inclined surface facing downwards, while the lower inclined blocks 45 correspondingly set on the left roll gap adjusting assembly 4a and the right roll gap adjusting assembly 4b have a second inclined surface facing upwards. With the cooperation of the first and second inclined surfaces, the upper inclined blocks drive the upper hot pressing assembly 3a to rise and fall vertically along the linear slide rail 2, thereby achieving the effect of adjusting the gap between the upper hot pressing assembly 3a and the lower hot pressing assembly 3b, realizing the adjustable roll gap between the upper and lower pressure rollers, and enhancing the applicability of the equipment.

[0040] It should be noted that in this embodiment, the servo motors 41 of the left and right sets of roller gap adjustment components 4 work synchronously, so that the height adjustment of both ends of the upper hot pressing component 3a is consistent, and the upper and lower pressure rollers 34 are always kept horizontal.

[0041] Furthermore, the lithium battery cell separator hot-pressing mechanism of this invention also includes a thickness detection module (not shown in the figure). The thickness detection module is installed at the feed and discharge points of the battery cell separator, and is used to detect whether the thickness of the separator after hot pressing meets the requirement of uniform thickness. Preferably, in this embodiment, the thickness detection module includes two displacement sensors of the same model. The displacement sensors are standard parts in the prior art. The two displacement sensors are arranged opposite to each other on the upper and lower sides of the battery cell separator and aligned with the upper and lower surfaces of the battery cell separator, thereby obtaining the thickness information of the pressed battery cell separator at intervals.

[0042] Furthermore, the diaphragm hot pressing mechanism for a lithium battery cell in this invention also includes a temperature monitoring module (not shown in the figure). The temperature monitoring module is a standard component in the market, used to monitor whether the roller surface temperature has reached the set value. Only when the roller surface temperature reaches the set value and the temperature distribution is consistent can the diaphragm hot pressing operation be performed. Preferably, in this embodiment, the temperature monitoring module is a standard component of model Keyence FT-H10.

[0043] Compared to existing technologies, the lithium battery cell separator hot-pressing mechanism of this invention features two sets of hot-pressing components. These components pre-press the cell separator, ensuring a uniform thickness and reducing the risk of electrode misalignment, while improving the alignment of overlapping electrode arrangements. Two sets of roller gap adjustment components are also included. These components adjust the gap between the upper and lower hot-pressing components using the inclined surfaces of the upper and lower iron blocks, allowing for adjustable roller gaps between the upper and lower pressure rollers and enhancing the equipment's versatility.

[0044] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A diaphragm hot pressing mechanism for a lithium battery cell, comprising a frame (1), a linear slide rail (2) vertically arranged on the frame (1), and a slider (21) correspondingly arranged on the linear slide rail (2), characterized in that: The frame (1) is also provided with two sets of hot pressing components (3) arranged horizontally and vertically opposite each other. The two sets of hot pressing components (3) include an upper hot pressing component (3a) and a lower hot pressing component (3b) arranged vertically and vertically opposite each other. Each hot pressing component (3) includes a hot pressing servo motor (31), a hot pressing reducer (32), a first bearing seat (33), a pressure roller (34), and a second bearing seat (35) connected in sequence. The pressure roller (34) has multiple sets of heating tubes built in. The hot pressing servo motor (31) drives the hot pressing reducer (32) to drive the pressure roller (34) to rotate, thereby heating and pressing the battery cell separator located between the upper and lower pressure rollers (34).

2. The separator hot-pressing mechanism of a lithium cell according to claim 1, wherein: The frame (1) is also provided with two sets of roller gap adjustment components (4) arranged longitudinally and horizontally, and the two sets of roller gap adjustment components (4) are inserted between the two sets of hot pressing components (3). The two sets of roller gap adjustment components (4) include a left roller gap adjustment component (4a) and a right roller gap adjustment component (4b) arranged left and right at intervals. Each roller gap adjustment component (4) includes a pitch adjustment servo motor (41), a pitch adjustment reducer (42), a pitch adjustment bearing seat (43), a ball screw (44) and a downward inclined iron block (45) arranged in sequence. The downward inclined iron block (45) is sleeved on the ball screw (44) and screwed to the ball screw (44). The pitch adjustment servo motor (41) drives the pitch adjustment reducer (42) and drives the ball screw (44) to rotate, thereby driving the downward inclined iron block (45) to translate along the axial direction of the ball screw (44) on the ball screw (44).

3. The diaphragm hot-pressing mechanism for a lithium battery cell according to claim 2, characterized in that: The first and second inclined iron blocks (351) are respectively fixedly arranged on the bottom surfaces of the first bearing seat (33) and the second bearing seat (35) of the upper hot pressing assembly (3a). The first and second inclined iron blocks (351) are used to cooperate with the roll gap adjustment assembly (4) to adjust the roll gap spacing.

4. The diaphragm hot-pressing mechanism for a lithium battery cell according to claim 3, characterized in that: The lower inclined iron block (45) of the left roll gap adjustment component (4a) is vertically and vertically corresponding to the first upper inclined iron block of the upper hot pressing component (3a), and the inclined surfaces cooperate with each other; the lower inclined iron block (45) of the right roll gap adjustment component (4b) is vertically and vertically corresponding to the second upper inclined iron block (351) of the upper hot pressing component (3a), and the inclined surfaces cooperate with each other.

5. The diaphragm hot-pressing mechanism for a lithium battery cell according to claim 4, characterized in that: The first bearing seat (33) and the second bearing seat (35) of the upper hot pressing assembly (3a) are respectively movably mounted on the slider (21) of the linear slide rail (2) via connecting plates.

6. The diaphragm hot-pressing mechanism for a lithium battery cell according to claim 5, characterized in that: The first bearing seat (33) and the second bearing seat (35) of the lower hot pressing assembly (3b) are respectively fixedly mounted on the frame (1) by connecting plates.

7. The diaphragm hot-pressing mechanism for a lithium battery cell according to claim 6, characterized in that: The pitch servo motors (41) of the left roll gap adjustment assembly (4a) and the right roll gap adjustment assembly (4b) work synchronously.

Images