Battery cell shaping mechanism

Abstract

The battery cell shaping mechanism comprises a battery cell stretching assembly and a piezoelectric cell assembly, the battery cell stretching assembly comprises a first mounting base plate, a sliding seat arranged on the first mounting base plate in a translation manner, and an opening clamp arranged on the sliding seat; the clamp translation driving unit is arranged on the first mounting base plate and is used for controlling the sliding seat to translate; the clamp opening driving unit is arranged on the sliding seat and is used for controlling the two arms of the opening clamp to be opened; the battery cell placing table is arranged on the second mounting base plate, the battery cell pressing block is arranged on the second mounting base plate in a manner of moving up and down, the pressing block driving unit is used for controlling the battery cell pressing block to move, and the second mounting base plate is provided with a hollowed-out part for the opening clamp to penetrate through. And when the opening clamp moves forwards along with the sliding seat, at least part of the opening clamp can penetrate through the hollow part and extend into the battery cell placed on the battery cell placing table. According to the utility model, a circular-ring-shaped battery cell can be shaped into a square battery cell.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery processing technical field, concretely relates to a shaping mechanism of small -size electric core. BACKGROUND

[0002] With the development of technology and the improvement of people's living standards, more and more new digital products appear in people's life, such as Bluetooth headset, smart watch, sports bracelet etc., in order to facilitate the carrying, the requirement of volume is very high, all pursue miniaturization and miniaturization. Influenced by the internal space and structure factors of product, the demand of small -size square battery, arc battery and other small -size battery is also more and more big. The electric core of small -size square battery, arc battery and other small -size battery is usually made by using the lamination process, and the winding process is rarely used, so there is the demand of developing the shaping mechanism for the small -size electric core made by using the winding process. SUMMARY

[0003] The utility model is provided with a kind of shaping mechanism for the electric core of winding process production.

[0004] To achieve the above object, the utility model takes the following technical solutions:

[0005] A kind of electric core shaping mechanism, comprising: electric core stretching assembly and press electric core component;The electric core stretching assembly includes first installation base plate, the slide that can be translationally arranged on the first installation base plate, the prop open clamp arranged on the slide, the clamp translation drive unit for controlling the translation of the slide is arranged on the first installation base plate, and the clamp opening drive unit for controlling the opening of the two arms of the prop open clamp is arranged on the slide;The press electric core component includes second installation base plate, the electric core placement table that is arranged on the second installation base plate, the electric core pressing block that can be up and down movably arranged on the second installation base plate, the pressing block drive unit for controlling the movement of the electric core pressing block, the second installation base plate is provided with the hollow for the prop open clamp to pass through, and the prop open clamp can at least partially pass through the hollow and extend into the electric core inside when the slide is forwardly moved.

[0006] In some embodiments, the clamp opening drive unit is motor, the output shaft of the motor is connected with a lead screw, the nut on the lead screw is connected with a cam seat, and the cam is arranged on the cam seat;The tail of the prop open clamp is dovetail type, the cam is located between the tails of the two arms, and the cam will open the two arms in parallel when the cam seat is forwardly moved.

[0007] Further, a door-shaped support is arranged on the sliding seat, side plates of the support are located on both sides of the expansion clamp, and a spring for providing a force for closing of the expansion clamp is arranged between the side plates and the arm of the expansion clamp.

[0008] Further, a linear bearing is arranged on the side plate, and a guide rod passes through the linear bearing and the arm of the expansion clamp, and an axis of the guide rod is perpendicular to an extending direction of the arm of the expansion clamp.

[0009] Further, the spring is sleeved on the guide rod.

[0010] In some embodiments, the cell pressing block comprises a first pressing block and a second pressing block arranged at intervals.

[0011] Further, the first pressing block and the tab of the cell are located on the same side, and the length of the first pressing block is greater than the length of the second pressing block.

[0012] According to the above technical solution, for the circular cell made by the winding process, the expansion clamp in the cell stretching assembly can stretch and expand the circular cell into an elliptical cell, and then the cell pressing block of the cell pressing assembly can press the elliptical cell into a square, so that the production demand of the small battery cell, such as the small square battery and the arc-shaped battery, prepared by the winding process is met. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 It is a structure diagram of a pole piece;

[0015] Figure 2 It is a winding diagram of winding the pole piece and the diaphragm into a cell;

[0016] Figure 3 It is a schematic diagram of the cell obtained by winding;

[0017] Figure 4 It is a top view of the cell obtained by winding;

[0018] Figure 5 It is a structure diagram of the cell shaping mechanism of the embodiment of the present application;

[0019] Figure 6The structure schematic diagram of the battery cell stretching assembly of the embodiment of the utility model;

[0020] Figure 7 The structure schematic diagram of the piezoelectric cell assembly of the embodiment of the utility model;

[0021] Figure 8 The schematic diagram of the battery cell before shaping;

[0022] Figure 9 The schematic diagram of the battery cell after being supported into an oval shape by the supporting clamp;

[0023] Figure 10 The schematic diagram of the battery cell when being pre-pressed by the pressing block;

[0024] Figure 11 The schematic diagram of the battery cell when the supporting clamp is closed and withdrawn;

[0025] Figure 12 The schematic diagram of the battery cell when the battery cell unloading clamp is withdrawn;

[0026] Figure 13 The schematic diagram of the battery cell when being pressed by the pressing block;

[0027] Figure 14 The top view of the battery cell after shaping is completed;

[0028] Figure 15 The side view of the battery cell after shaping is completed.

[0029] The specific embodiments of the utility model will be further described in detail in combination with the accompanying drawings. Specific embodiments

[0030] The utility model will be described in detail in combination with the accompanying drawings, and in the detailed description of the embodiment of the utility model, for the convenience of description, the drawings of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the utility model herein. It should be noted that the drawings are simplified and all use non-precise proportions, only to facilitate, clearly assist in the purpose of describing the embodiment of the utility model. Meanwhile, in the description of the application, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features; the directions or position relationships indicated by the terms "positive", "negative", "bottom", "upper", "lower" and the like are based on the directions or position relationships shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular direction, be constructed and operated in a particular direction, so it cannot be understood as a limitation of the utility model.

[0031] In the description of the utility model, it is necessary to explain that, unless there are explicit provisions and limitations, the terms "connected", "connected" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements, or it can be wireless connection, or wired connection.For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] The traditional small square battery, arc-shaped battery and other small batteries are mostly made of laminated process, and the positive and negative sheets and the separator are stacked in order, and then pressed into a battery core. In order to meet the demand of small battery core, a new winding process is used to prepare the battery core. When winding, the sheet is not a continuous sheet, but a piece of sheet. As shown in Figure 1 The sheet has a coating area A (diagonal filled area) and a foil area B (grid filled area), and the tab C is arranged at the foil area B. The width of the sheet is between 3mm and 8mm, and the length is between 70mm and 250mm.

[0033] The non-tab end of the sheet with the above structure is sent forward, and the sheet is wrapped with the separator, and then the sheet and the separator are wound together to form a battery core. As shown in Figure 2 The first separator 100, the first sheet 101, the second separator 102 and the second sheet 103 are wound at the winding needle (not shown). The sheet feeding direction of the first sheet 101 and the second sheet 102 is opposite, that is, as shown in the direction of Figure 2 The first sheet 101 is sent from left to right, and the second sheet 103 is sent from right to left. The feeding direction of the first separator 100 and the second separator 102 is also opposite, for example, as shown in the direction of Figure 2 The first separator 100 is sent obliquely downward, and the second separator 102 is sent obliquely upward. The first separator 100, the first sheet 101 and the second separator 102, the second sheet 103 are arranged in a central symmetric form with the axis of the winding needle as the center of symmetry, the first sheet 101 is between the first separator 101 and the second separator 103, and the second sheet 102 is between the first separator 101 and the second separator 103. After winding, the obtained battery core is in the form of a ring, as shown in Figure 3 And Figure 4 The tab C is located at the winding tail end of the battery core. After the ring-shaped battery core is taken off from the winding needle, it is shaped into a square battery core.

[0034] The battery core shaping mechanism of the utility model is designed for the winding equipment of the soft package lithium battery, and is used for shaping the ring-shaped battery core obtained by winding into a square battery core. As shown in Figure 5As shown, the cell shaping mechanism of this embodiment includes a cell stretching assembly 1 and a cell pressing assembly 2. The cell stretching assembly 1 is used to stretch the annular cell to both sides, thereby expanding the circular annular cell into an elliptical annular shape. The cell pressing assembly 2 is used to flatten the elliptical annular cell into a square shape.

[0035] like Figure 5 and Figure 6 As shown, the cell stretching assembly 1 in this embodiment includes a first mounting base 1-1, a spreading clamp 1-2, a clamp translation drive unit 1-3, a slide 1-4, and a clamp opening drive unit 1-5. The first mounting base 1-1 is used to mount the components of the cell stretching assembly 1 onto the frame (not shown) of the winding equipment.

[0036] The slide block 1-4 is slidably mounted on the first mounting base 1-1. The opening clamp 1-2 is mounted on the slide block 1-4. When the slide block 1-4 moves under the control of the clamp translation drive unit 1-3, it can drive the opening clamp 1-2 mounted on the slide block 1-4 to move back and forth together. When the opening clamp 1-2 moves forward, it can extend into the annular battery cell 100 placed on the battery cell placement platform. When the opening clamp 1-2 moves backward, it can exit from the annular battery cell 100.

[0037] In this embodiment, a pair of linear slide rails a are provided on the first mounting base plate 1-1, and the slide block 1-4 is disposed on the linear slide rails a and moves back and forth along the linear slide rails a under the control of the clamp translation drive unit 1-3. In this embodiment, the clamp translation drive unit 1-3 is a cylinder.

[0038] In this embodiment, the clamp opening drive unit 1-5 controls the opening and closing of the expanding clamp 1-2. When the expanding clamp 1-2 opens, the two arms of the expanding clamp 1-2 move away from each other, thereby flattening and expanding the annular battery cell into an elliptical ring. In this embodiment, the clamp opening drive unit 1-5 uses a servo motor, which is fixed on the slide 1-4. The servo motor controls the opening and closing of the expanding clamp 1-2 through a lead screw and nut transmission structure and a cam. Figure 6 As shown, the output shaft of the servo motor is connected to the lead screw 1-7 via coupling 1-6. When the servo motor is working, it drives the lead screw 1-7 to rotate. The nut 1-8 on the lead screw 1-7 is connected to the cam seat 1-9. When the servo motor drives the lead screw 1-7 to rotate, the nut 1-8 on the lead screw 1-7 drives the cam seat 1-9 to move back and forth on the slide 1-4. The cam 1-10 is set on the cam seat 1-9 and is located between the tails of the two arms that open the clamp 1-2. The tails of the two arms are dovetail-shaped. When the cam 1-10 moves forward with the cam seat 1-9, it opens the two arms of the clamp 1-2 in parallel.

[0039] In this embodiment, a portal-shaped bracket 1-11 is provided on the slide 1-4. The bracket 1-11 serves two purposes: supporting the lead screw 1-7 and using its side plates as mounting plates for the springs and linear bearings. The side plates of the bracket 1-11 are located on both sides of the opening clamp 1-2. A spring 1-12 is positioned between the side plates of the bracket 1-11 and the opening clamp 1-2. One end of the spring 1-12 rests against the arm of the opening clamp 1-2, and the other end rests against the side plate of the bracket 1-11, providing force for the closing of the opening clamp 1-2. When the cam 1-10 retracts, the opened arm closes under the action of the spring 1-12.

[0040] To ensure good parallelism when the clamp 1-2 opens and closes, a linear bearing 1-13 is provided on the side plate of the bracket 1-11. A guide rod 1-14 passes through the linear bearing 1-13 and the arm of the clamp 1-2, guiding the opening or closing of the arm. In this embodiment, a spring 1-12 is fitted onto the guide rod 1-14. The axis of the guide rod 1-14 is perpendicular to the extension direction of the arm of the clamp 1-2.

[0041] like Figure 5 and Figure 7 As shown, the piezoelectric cell assembly 2 in this embodiment includes a second mounting substrate 2-1, a cell placement stage 2-2, a first pressing block 2-3, a second pressing block 2-4, and a pressing block driving unit 2-5. The second mounting substrate 2-1 is used to mount the components of the piezoelectric cell assembly 2 onto the frame of the winding equipment.

[0042] In this embodiment, the second mounting substrate 2-1 is perpendicular to the first mounting substrate 1-1. The second mounting substrate 2-1 has a perforation 2-1a through which the opening clamp 1-2 passes. The cell placement platform 2-2 is disposed on the second mounting substrate 2-1 and corresponds to the perforation 2-1a. After the opening clamp 1-2 passes through the perforation 2-1a, it can extend into the annular cell 100 placed on the cell placement platform 2-2. Figure 5 and Figure 7 The dashed lines in the text represent battery cells after pressing and shaping.

[0043] The first pressing block 2-3 and the second pressing block 2-4 are located above the cell placement platform 2-2. In this embodiment, the first pressing block 2-3 and the second pressing block 2-4 are spaced apart. The gap between the two pressing blocks is to facilitate the extraction of the cell unloading clamp 200 and to avoid interference. In this embodiment, the lengths of the first pressing block 2-3 and the second pressing block 2-4 are different. The first pressing block 2-3 and the electrode tab of the cell are located on the same side. In order to ensure a good pressing and shaping effect, the length of the first pressing block 2-3 is greater than the length of the second pressing block 2-4.

[0044] In this embodiment, the pressing block driving unit 2-5 is a stepper motor. The first pressing block 2-3 and the second pressing block 2-4 are both disposed on the linear slide rail a of the second mounting base plate 2-1. When the stepper motor is activated, it drives the first pressing block 2-3 and the second pressing block 2-4 to move downward or upward. When moving downward, the battery cell 100 placed on the battery cell placement platform 2-2 can be shaped and pressed into a square battery cell.

[0045] The following is combined with Figures 5 to 15 The process of the battery cell shaping mechanism in this embodiment shaping the battery cell will be described.

[0046] The positive and negative electrode plates (first and second electrode plates) are fed to the winding needle, and after being wrapped and wound with a diaphragm, a ring-shaped battery cell 100 is formed; the battery cell unloading clamp 200 removes the battery cell from the winding needle and moves it to the battery cell placement platform 2-2; Figure 8 As shown, at this time, the battery cell 100 is in the shape of a ring, and the battery cell unloading clamp 200 is clamped on the inner and outer sides of the upper part of the battery cell 100, with the electrode C of the battery cell 200 extending horizontally; the clamp translation drive unit 1-3 controls the opening clamp 1-2 to move forward and extend into the ring-shaped battery cell 100, at which time the battery cell unloading clamp 200 is in the state of clamping the battery cell; after the front part of the opening clamp 1-2 extends into the battery cell 100, the clamp opening drive unit 1-5 controls the two arms of the opening clamp 1-2 to open to the left and right sides, opening the ring-shaped battery cell 100 into an elliptical shape, as shown. Figure 9 As shown, at this time, the cell feeding clamp 200 moves downward following the change in the shape of the cell;

[0047] After the battery cell 100 is stretched into an elliptical shape, the first pressure block 2-3 and the second pressure block 2-4, under the control of the pressure block driving unit 2-5, gently press the battery cell 100 downwards, as follows: Figure 10 As shown; the clamp opening drive unit 1-5 controls the two arms of the clamp 1-2 to move towards the middle, as... Figure 11 As shown; then the clamp translation drive unit 1-3 controls the clamp 1-2 to move backward, removing the battery cell 100. After the clamp 1-2 is opened and the battery cell 100 is removed, the battery cell unloading clamp 200 releases the battery cell and also begins to remove the battery cell, as shown. Figure 12 As shown;

[0048] After the cell feeding clamp 200 retracts, the pressing block drive unit 2-5 continues to control the first pressing block 2-3 and the second pressing block 2-4 to further press down on the cell 100, pressing the cell 100 tightly and shaping it. Figure 13 As shown; the shaped battery cell is as follows Figure 14 and Figure 15 As shown, the annular battery cell 100 is shaped into a square battery cell 100. The total length of the shaped battery cell, including the tabs, is about 40 mm, the width is 3 mm to 8 mm, and the thickness is about 2 mm to 4 mm.

[0049] When the battery cell blanking clamp adopts other structural forms, the first pressing block and the second pressing block can also be integrated into one battery cell pressing block to perform downward pressing and shaping on the battery cell.

[0050] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cell shaping mechanism characterized by, The application relates to a battery cell stretching and piezoelectric cell assembling device. The battery cell stretching assembly comprises a first mounting base plate, a sliding seat arranged on the first mounting base plate in a translatable manner, a stretching clamp arranged on the sliding seat, a clamp translation driving unit arranged on the first mounting base plate and used for controlling the translation of the sliding seat, and a clamp opening driving unit arranged on the sliding seat and used for controlling the opening of the two arms of the stretching clamp. The piezoelectric cell assembly comprises a second mounting base plate, a battery cell placing table arranged on the second mounting base plate, a battery cell pressing block arranged on the second mounting base plate in a movable manner, and a pressing block driving unit arranged on the second mounting base plate and used for controlling the movement of the battery cell pressing block. The clamp opening driving unit is a motor, the output shaft of the motor is connected with a lead screw, a nut on the lead screw is connected with a cam base, and a cam is arranged on the cam base.

2. The cell shaping mechanism of claim 1, wherein: The tail of the stretching clamp is in the shape of a swallow tail, the cam is located between the tails of the two arms, and the cam can stretch the two arms in parallel when the cam base moves forward.

3. The cell shaping mechanism of claim 2, wherein: A door-shaped support is arranged on the sliding seat, the side plates of the support are located on the two sides of the stretching clamp, and springs are arranged between the side plates and the arms of the stretching clamp and used for providing force for the closing of the stretching clamp.

4. The cell shaping mechanism of claim 3, wherein: Linear bearings are arranged on the side plates, guide rods pass through the linear bearings and the arms of the stretching clamp, and the axes of the guide rods are perpendicular to the extending directions of the arms of the stretching clamp.

5. The cell shaping mechanism of claim 4, wherein: The springs are sleeved on the guide rods.

6. The cell shaping mechanism of claim 1, wherein: The battery cell pressing block comprises first and second pressing blocks which are arranged in a spaced manner.

7. The cell shaping mechanism of claim 6, wherein: The first pressing block and the tab of the battery cell are located on the same side, and the length of the first pressing block is greater than that of the second pressing block.

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