A preparation device and preparation method of arc-shaped bare battery cell

Abstract

The present invention belongs to the technical field of battery manufacturing, and specifically relates to a device for preparing an arc-shaped bare battery cell, including a winding part and an extrusion part, wherein the winding part is formed with an arc-shaped surface, the extrusion surface of the extrusion part is used to correspond to the arc-shaped surface, the winding part is provided with a clamping groove, the clamping groove is provided on the side or the center of the winding part, and the side of the winding part is provided with a rotating shaft, which is used to drive the winding part to rotate circumferentially. The present invention avoids the hidden dangers of battery cell damage or short circuit caused by forced extrusion molding of the battery cell, and effectively realizes the winding of the pole piece and the diaphragm into an arc-shaped bare battery cell. In addition, the present invention also provides a method for preparing an arc-shaped bare battery cell.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery manufacturing, and in particular relates to a preparation device and a preparation method of an arc-shaped bare battery cell. Background Art

[0002] Nowadays, soft-pack lithium-ion batteries are generally designed in a square structure and can be widely used in most electronic devices. However, in some product applications, ordinary square soft-pack lithium-ion batteries cannot meet the required functions, such as watch straps, camera lenses, headphones, etc.

[0003] The applicant found that: 1) the existing production technology for manufacturing curved bare cells is immature and cannot achieve the bending of the cells while ensuring the performance of the battery; 2) the existing curved bare cell preparation device has a low degree of integration and cannot guarantee the preparation efficiency and finished product quality of the curved bare cells; 3) in the process of battery manufacturing, it is difficult to wind the diaphragm and the pole piece into a cell. Therefore, a new type of curved bare cell preparation device and preparation method is urgently needed to solve the above problems. Summary of the invention

[0004] One of the purposes of the present invention is to provide a preparation device for arc-shaped bare battery cells in response to the deficiencies in the prior art, thereby avoiding the hidden dangers of battery cell damage or short circuit caused by forced extrusion of battery cells, effectively realizing the winding of pole pieces and diaphragms into arc-shaped bare battery cells, significantly improving the integration level of the preparation device, and ensuring the preparation efficiency and finished product quality of the arc-shaped bare battery cells.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A preparation device for an arc-shaped bare battery cell comprises a winding portion and an extrusion portion, wherein the winding portion is formed with an arc-shaped surface, the extrusion surface of the extrusion portion is used to correspond to the arc-shaped surface, the extrusion portion is provided with a first groove and a second groove relative to each other, the first groove and the second groove are both used to correspond to the outer edge of the arc-shaped surface, the winding portion is provided with a clamping groove, the clamping groove is provided on the side or the center of the winding portion, the side of the winding portion is provided with a rotating shaft, the rotating shaft is used to drive the winding portion to rotate circumferentially, and the first groove and the second groove can extrude the pole piece and the diaphragm on the outer edge of the arc-shaped surface.

[0007] Furthermore, the curvature of the arc-shaped surface is U, and the curvature of the extrusion surface is V, satisfying the relationship: 60°≤U≤120°, 240°≤V≤300°, U+V=360°.

[0008] Furthermore, the first groove and the second groove are both arc grooves, the curvature of the first groove is equal to the curvature of the second groove, and the curvature of the first groove and the curvature of the second groove are both 150° to 175°, thereby squeezing the outer edges of the pole piece and the diaphragm into an arc, achieving a smooth transition between the outer edges of the pole piece and the diaphragm, and significantly reducing the edge stress of the pole piece and the diaphragm.

[0009] Furthermore, the clamping groove is arranged in the center of the winding part, and the clamping groove passes through the winding part from the center of the arc surface. The side wall of the clamping groove is provided with a clamping piece, and the clamping piece is used to clamp the pole piece and the diaphragm placed in the clamping groove, and the clamping piece has a clamping switch.

[0010] Furthermore, the preparation device also includes a first driver and a second driver, the output end of the first driver is connected to the rotating shaft, the extrusion portion is installed with a piston rod, and the output end of the second driver is connected to the piston rod.

[0011] Furthermore, the first driver and the second driver may be one of a servo motor, a hydraulic cylinder or a pneumatic cylinder respectively.

[0012] Furthermore, the preparation device also includes a fixed seat, the first driver is arranged inside the fixed seat, and the fixed seat is connected to the rotating shaft.

[0013] Furthermore, the preparation device also includes a support arm, the first driver is arranged inside the support arm, the support arm is connected to the rotating shaft, the support arm is also connected to a robotic arm, the other end of the robotic arm is connected to the extrusion part, a guide member is arranged inside the support arm, the guide member is connected to the robotic arm, the robotic arm swings back and forth through the guide member, and the guide member is a guide spring.

[0014] The second object of the present invention is to provide a method for preparing a curved bare battery cell, comprising the following steps:

[0015] Step 1: stacking the first diaphragm, the anode electrode sheet, the second diaphragm, and the cathode electrode sheet in sequence, and then clamping the end of the first diaphragm and the end of the second diaphragm in the clamping groove;

[0016] Step 2: Winding the first diaphragm, the anode electrode sheet, the second diaphragm and the cathode electrode sheet along the arc surface and close to the winding portion;

[0017] Step 3, pressing the extrusion surface toward the arcuate surface, and then separating the extrusion surface from the arcuate surface;

[0018] Step 4: Repeat step 2 and step 3 until a curved bare cell is formed.

[0019] Furthermore, the curvature of the arc-shaped surface is set to 60° to 120°, and the pressure of the extrusion surface is set to 0.1 to 0.4 MPa.

[0020] Furthermore, in the step one, before the first diaphragm, the anode electrode sheet, the second diaphragm and the cathode electrode sheet are stacked in sequence, the anode ear and the cathode ear are welded to the empty foil area of ​​the anode electrode sheet and the empty foil area of ​​the cathode electrode sheet respectively, and the welding method is one of ultrasonic welding or laser welding.

[0021] The beneficial effects of the present invention are as follows: a preparation device for an arc-shaped bare battery cell of the present invention comprises a winding part and an extrusion part, the winding part is provided with a clamping groove, the clamping groove can place the pole piece and diaphragm to be clamped, the winding part is formed with an arc-shaped surface, the extrusion surface of the extrusion part is used to correspond to the arc-shaped surface, the extrusion part is provided with a first groove and a second groove relative to each other, the first groove and the second groove are both used to correspond to the outer edge of the arc-shaped surface, when the pole piece and the diaphragm are wound along the arc-shaped surface, the extrusion surface can uniformly extrude the pole piece and the diaphragm on the arc-shaped surface, and extrude the surface of the pole piece and the diaphragm into the desired arc shape, avoiding the hidden danger of cell damage or short circuit caused by forced extrusion forming of the battery cell, the preparation device has the functions of winding and rolling, and has a high degree of integration, thereby ensuring the preparation efficiency and finished product quality of the arc-shaped bare battery cell. In addition, in the preparation method of the arc-shaped bare battery cell of the present invention, when the rotating shaft rotates, the pole piece and the diaphragm are wound along the arc-shaped surface, and the extrusion surface can extrude the pole piece and the diaphragm on the arc-shaped surface into the desired arc shape without damaging the pole piece and the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0023] Figure 2 This is a structural diagram of the connection driver of Example 1 of the present invention.

[0024] Figure 3 This is a structural diagram of the winding part and the extrusion part of Example 1 of the present invention.

[0025] Figure 4 This is a structural diagram of embodiment 2 of the present invention.

[0026] Figure 5 This is a structural diagram of the guide member of Example 2 of the present invention.

[0027] Figure 6 This is a schematic diagram of preparing a battery cell according to the present invention.

[0028] Figure 7 It is a structural diagram of the finished battery cell of the present invention.

[0029] Among them: 1-winding part; 2-extrusion part; 3-rotating axis; 4-first drive; 5-second drive; 6-fixed seat; 7-support arm; 8-mechanical arm; 9-guide; 11-arc surface; 12-clamping groove; 11-arc surface; 20-extrusion surface; 21-first groove; 22-second groove; 23-piston rod; 101-first diaphragm; 102-anode pole piece; 103-second diaphragm; 104-cathode pole piece; 105-anode ear; 106-cathode ear. DETAILED DESCRIPTION

[0030] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" is an open term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0031] In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention.

[0032] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0033] The present invention is further described in detail below with reference to specific embodiments, but is not intended to limit the present invention.

[0034] Example 1

[0035] like Figures 1 to 3As shown, a preparation device for an arc-shaped bare battery cell includes a winding portion 1 and an extrusion portion 2, the winding portion 1 is formed with an arc-shaped surface 11, the arc-shaped surface 11 is a concave arc surface, the extrusion surface 20 of the extrusion portion 2 is used to correspond to the arc-shaped surface 11, the extrusion surface 20 is a convex arc surface, the extrusion portion 2 is provided with a first groove 21 and a second groove 22 relative to each other, the first groove 21 and the second groove 22 are both used to correspond to the outer edge of the arc-shaped surface 11, the extrusion surface 20 matches the arc-shaped surface 11, the first groove 21 and the second groove 22 match the outer edge of the arc-shaped surface 11, the winding portion 1 is provided with a clamping groove 12, and the side of the winding portion 1 is provided with a rotating shaft 3, and the rotating shaft 3 drives the winding portion 1 to realize a 360° circumferential rotation.

[0036] Preferably, the curvature of the arc surface 11 is U, and the curvature of the extrusion surface 20 is V, satisfying the relationship: 80°≤U≤100°, 260°≤V≤280°, U+V=360°.

[0037] Preferably, the first groove 21 and the second groove 22 are both arc-shaped grooves, the curvature of the first groove 21 and the curvature of the second groove 22 are equal, and the curvature of the first groove 21 and the curvature of the second groove 22 are both 160°. The first groove 21 and the second groove 22 can extrude the outer edges of the pole piece and the diaphragm into an arc, thereby achieving a smooth transition between the outer edges of the pole piece and the diaphragm, and significantly reducing the edge stress of the pole piece and the diaphragm.

[0038] Preferably, the clamping groove 12 is arranged at the center of the winding portion 1 , and the clamping groove 12 penetrates the winding portion 1 from the center of the arc surface 11 . A clamping member is arranged on the side wall of the clamping groove 12 , and the clamping member has a clamping switch.

[0039] Preferably, it also includes a first driver 4 and a second driver 5, the output end of the first driver 4 is connected to the rotating shaft 3, the extrusion part 2 is equipped with a piston rod 23, the output end of the second driver 5 is connected to the piston rod 23, and under the drive of the second driver 5, the piston rod 23 performs piston motion, thereby driving the extrusion part 2 to reciprocate, the first driver 4 and the second driver 5 are both servo motors, and the first driver 4 and the second driver 5 are connected to the same PLC controller.

[0040] Preferably, it also includes a fixed seat 6, the first driver 4 is arranged inside the fixed seat 6, and the fixed seat 6 is connected to the rotating shaft 3, wherein the winding part 1, the fixed seat 6 and the rotating shaft 3 have high hardness, the device has good stability, and can effectively resist the pressure impact of the extrusion part 2.

[0041] The working process of this embodiment includes: the pole piece and the diaphragm are clamped into the clamping groove 12, the clamping member clamps the pole piece and the diaphragm, and the pole piece and the diaphragm are wound from one side of the winding part 1 to the other side. Then, the PLC controller is started. The PLC controller first controls the second driver 5 to run. Under the drive of the second driver 5, the extrusion surface 20 of the extrusion part 2 presses the arc surface 11 of the winding part 1, and the extrusion surface 20 squeezes the pole piece and the diaphragm so that the pole piece and the diaphragm form a stable arc structure. The second driver 5 controls the extrusion part 2 to move away from the winding part 1, and the PLC controller controls the first driver 4 to run. The rotating shaft 3 drives the winding part 1 to rotate 360°, and the extrusion part 2 squeezes the pole piece and the diaphragm again. After the extrusion is completed, the clamping switch of the clamping member is released, and the arc-shaped battery cell can be taken out from the winding part 1.

[0042] Example 2

[0043] like Figures 4-5 As shown, this embodiment is different from Embodiment 1 in that a preparation device for an arc-shaped bare battery cell includes a winding portion 1 and an extrusion portion 2, the winding portion 1 is provided with a clamping groove 12, the clamping groove 12 is arranged in the center of the winding portion 1, the side wall of the clamping groove 12 is provided with a clamping member, the clamping member has a clamping switch, the winding portion 1 is formed with an arc surface 11, the extrusion surface 20 of the extrusion portion 2 is used to correspond to the arc surface 11, the fixing seat 6 of Embodiment 1 is replaced by a support arm 7, a first driver 4 is arranged in the support arm 7, the support arm 7 is connected to the rotating shaft 3, the first driver 4 is a driving motor, the first driver 4 drives the rotating shaft 3 to rotate, the support arm 7 is also connected to a mechanical arm 8, the other end of the mechanical arm 8 is connected to the extrusion portion 2, a guide member 9 is arranged inside the support arm 7, the guide member 9 is a guide spring, the guide member 9 is connected to the mechanical arm 8, the mechanical arm 8 realizes reciprocating swing through the guide member 9, so that the extrusion portion 2 can reciprocately extrude the arc surface 11.

[0044] Example 3

[0045] This embodiment is different from Embodiment 1 in that the clamping groove 12 is arranged on the side of the winding portion 1, the clamping groove 12 is connected to the outer edge of the arc surface 11, the clamping groove 12 is provided with a clamping member, and the clamping member has a clamping switch. Other structures are the same as Embodiment 1 and will not be repeated here.

[0046] Example 4

[0047] This embodiment is different from Embodiment 2 in that the extrusion portion 2 is provided with a piston rod 23, the piston rod 23 is connected to the second driver 5, the first driver 4 and the second driver 5 are both drive motors, the first driver 4 and the second driver 5 are connected to the same PLC controller, and with the cooperation of the piston rod 23 and the robot arm 8, the extrusion portion 2 can move back and forth periodically, and the other structures are the same as those in Embodiment 2 and will not be repeated here.

[0048] Example 5

[0049] like Figures 6-7 As shown, a method for preparing a curved bare battery cell comprises the following steps:

[0050] Step 1: stack the first diaphragm 101, the anode electrode 102, the second diaphragm 103, and the cathode electrode 104 in sequence, and then clamp the end of the first diaphragm 101 and the end of the second diaphragm 103 in the clamping groove 12;

[0051] Step 2: Wind the first diaphragm 101, the anode electrode sheet 102, the second diaphragm 103 and the cathode electrode sheet 104 along the arc surface 11 and close to the winding part 1;

[0052] Step 3: Press the extrusion surface 20 toward the arcuate surface 11, and then separate the extrusion surface 20 from the arcuate surface 11;

[0053] Step 4: Repeat steps 2 and 3 until a curved bare cell is formed.

[0054] Preferably, in step 2, the first diaphragm 101, the anode electrode sheet 102, the second diaphragm 103 and the cathode electrode sheet 104 are circumferentially wound around the winding portion 1 along the arc surface 11, and the winding distance of each winding is one circle.

[0055] Preferably, in step three, when the extrusion surface 20 is pressed toward the arc-shaped surface 11 , the first groove 21 and the second groove 22 are also pressed toward the outer edge of the arc-shaped surface 11 at the same time.

[0056] Preferably, the curvature of the arc surface 11 is set to 60° to 120°, and the pressure of the extrusion surface 20 is set to 0.1 to 0.4 MPa. The pressure of the extrusion surface 20 will not damage the electrode and the diaphragm, and the pressure ensures the stability of the preparation device.

[0057] Preferably, in step one, before the first diaphragm 101, the anode electrode piece 102, the second diaphragm 103, and the cathode electrode piece 104 are stacked in sequence, the anode ear 105 and the cathode ear 106 are respectively welded to the empty foil area of ​​the anode electrode piece 102 and the empty foil area of ​​the cathode electrode piece 104 by laser welding, and the thickness of the ear is equal to the thickness of the empty foil area.

[0058] Obviously, it can be seen from the above embodiments that the winding portion 1 of the present invention is formed with an arc surface 11, and the extrusion surface 20 of the extrusion portion 2 is arranged opposite to the arc surface 11 and cooperates with each other, which can efficiently extrude the pole piece and the diaphragm to form the required arc shape, and the surface curvature of the pole piece and the diaphragm is uniform and the edge stress is small, which significantly improves the finished product quality of the arc-shaped bare battery cell and meets the needs of production and application.

[0059] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A device for preparing arc-shaped bare battery cells, characterized in that: The invention comprises a winding portion (1) and an extrusion portion (2), wherein the winding portion (1) is formed with an arcuate surface (11), and an extrusion surface (20) of the extrusion portion (2) is used to correspond to the arcuate surface (11), the arcuate of the arcuate surface (11) is U, and the arcuate of the extrusion surface (20) is V, satisfying the relationship: 60°≤U=V≤120°; The extrusion portion (2) is provided with a first groove (21) and a second groove (22) opposite to each other, the first groove (21) and the second groove (22) are both used to correspond to the outer edge of the arc surface (11), the winding portion (1) is provided with a clamping groove (12), and a rotating shaft (3) is provided on the side of the winding portion (1), and the rotating shaft (3) is used to drive the winding portion (1) to rotate in a circumferential direction; It also comprises a first driver (4) and a second driver (5), wherein the output end of the first driver (4) is connected to the rotating shaft (3), the extrusion portion (2) is provided with a piston rod (23), and the output end of the second driver (5) is connected to the piston rod (23); The invention also comprises a support arm (7), wherein the first driver (4) is arranged inside the support arm (7), the support arm (7) is connected to the rotating shaft (3), the support arm (7) is also connected to a mechanical arm (8), the other end of the mechanical arm (8) is connected to the extrusion portion (2), a guide member (9) is arranged inside the support arm (7), the guide member (9) is connected to the mechanical arm (8), and the mechanical arm (8) swings back and forth through the guide member (9).

2. The device for preparing the arc-shaped bare battery cell according to claim 1, characterized in that: The first groove (21) and the second groove (22) are both arc-shaped grooves, the curvature of the first groove (21) and the curvature of the second groove (22) are equal, and the curvature of the first groove (21) and the curvature of the second groove (22) are both 150°-175°.

3. The device for preparing the arc-shaped bare battery cell according to claim 1, characterized in that: The clamping groove (12) is arranged at the center of the winding portion (1), the clamping groove (12) penetrates the winding portion (1) from the center of the arc surface (11), and the side wall of the clamping groove (12) is provided with a clamping piece.

4. The device for preparing the arc-shaped bare battery cell according to claim 1, characterized in that: The preparation device further comprises a fixed seat (6), the first driver (4) is arranged inside the fixed seat (6), and the fixed seat (6) is connected to the rotating shaft (3).

5. A method for preparing a curved bare cell, applied to the device for preparing a curved bare cell as claimed in any one of claims 1 to 4, characterized in that: The steps include: Step 1: stacking the first diaphragm (101), the anode electrode sheet (102), the second diaphragm (103), and the cathode electrode sheet (104) in sequence, and then clamping the end of the first diaphragm (101) and the end of the second diaphragm (103) in the clamping groove (12) of the winding part (1); Step 2: Winding the first diaphragm (101), the anode electrode sheet (102), the second diaphragm (103) and the cathode electrode sheet (104) along the arc surface (11) of the winding portion (1) and closely against the winding portion (1); Step 3: Press the extrusion surface (20) of the extrusion portion (2) toward the arc-shaped surface (11), and then separate the extrusion surface (20) from the arc-shaped surface (11); Step 4: Repeat step 2 and step 3 until a curved bare cell is formed.

6. The method for preparing the arc-shaped bare battery cell according to claim 5, characterized in that: The curvature of the arc-shaped surface (11) is set to 60°-120°, and the pressure of the extrusion surface (20) is set to 0.1-0.4 Mpa.

7. The method for preparing the arc-shaped bare battery cell according to claim 5, characterized in that: In the step 1, before the first diaphragm (101), the anode electrode sheet (102), the second diaphragm (103) and the cathode electrode sheet (104) are sequentially stacked, the anode ear (105) and the cathode ear (106) are welded to the empty foil area of ​​the anode electrode sheet (102) and the empty foil area of ​​the cathode electrode sheet (104), respectively.

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