A cell lamination apparatus and method

Abstract

The application discloses an electrode lamination device and method, which comprises a diaphragm supply device, a negative electrode sheet supply device, a positive electrode sheet supply device, a sheet pasting device, a sheet body clamping device and a lamination table, wherein the diaphragm supply device provides diaphragms; the sheet pasting device is located between the diaphragm supply device and the lamination table, and is used for symmetrically pasting the negative electrode sheet provided by the negative electrode sheet supply device and the positive electrode sheet provided by the positive electrode sheet supply device on the diaphragm drawn out from the diaphragm supply device to form a laminated sheet body; the sheet body clamping device clamps the first end and the second end of the laminated sheet body; and the sheet body clamping device and the lamination table perform relative circular arc motion to stack the clamped laminated sheet body on the lamination table. The relative circular arc motion of the sheet body clamping device and the lamination table makes the laminated sheet body and the diaphragm which has not formed the laminated sheet body in a tight state, avoids the wrinkle condition in the diaphragm folding process, and improves the electrode lamination quality.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery manufacturing technology and relates to a cell stacking equipment and method. Background Technology

[0002] With the application of new energy sources, the production capacity requirements for lithium batteries are becoming increasingly stringent. Currently, there is a cell stacking process that uses a swing roller mechanism and a stacking platform to control the diaphragm to be stacked on the platform. The positive electrode sheet and the negative electrode sheet need to be placed in a sequential manner with intervals between the diaphragms on the stacking platform, so that the stacking on the platform is a cyclical stacking of negative electrode, diaphragm, positive electrode, diaphragm, and negative electrode sheet.

[0003] Because this stacking method requires the relative movement of the swing roller mechanism and the stacking table, the diaphragm cannot remain taut during the movement of the stacking table, which may cause wrinkles to appear during the diaphragm folding process, affecting the quality of the cell stacking. Summary of the Invention

[0004] To address the problems in related technologies, this application provides a battery cell stacking device and method, the technical solution of which is as follows:

[0005] In a first aspect, a battery cell stacking device includes a separator feeding device, a negative electrode feeding device, a positive electrode feeding device, a bonding device, a wafer clamping device, and a stacking table, wherein:

[0006] The diaphragm feeding device provides the diaphragm;

[0007] The patching device is located between the diaphragm feeding device and the stacking platform, and is used to symmetrically attach the negative electrode sheet provided by the negative electrode sheet feeding device and the positive electrode sheet provided by the positive electrode sheet feeding device to the diaphragm pulled out from the diaphragm feeding device to form a laminated sheet body.

[0008] The sheet clamping device clamps the first and second ends of the stacked sheet;

[0009] The sheet clamping device and the stacking platform perform relative circular arc movements to stack the clamped sheet onto the stacking platform.

[0010] Optionally, the sheet clamping device includes a first clamping part and a second clamping part, the first clamping part and the second clamping part being used to clamp the first end and the second end of the stacked sheet, respectively.

[0011] Optionally, the sheet clamping device further includes a first guide rail and a second guide rail, both vertically arranged. The first clamping part is mounted on the first guide rail and configured to move up and down along the first guide rail, and the second clamping part is mounted on the second guide rail and configured to move up and down along the second guide rail.

[0012] Optionally, the sheet clamping device further includes a tension holding mechanism, which is fixedly connected to the first clamping part and the second clamping part to ensure that the distance between the first clamping part and the second clamping part is fixed.

[0013] Optionally, the cell stacking equipment further includes an auxiliary tension roller device, which is disposed between the wafer clamping device and the stacking table and is configured to provide auxiliary tension to the diaphragm between the laminated wafers held by the wafer clamping device and the stacking table.

[0014] Optionally, the cell stacking equipment further includes a pressure plate configured to press against a first end of the stacking table near the diaphragm feeding device and configured to be removable from the first end of the stacking table.

[0015] Optionally, the sheet clamping device moves in an arc around the first end of the stacking platform to stack the clamped sheet onto the stacking platform; or, the stacking platform moves in an arc around the second end of the sheet clamping device to receive the stacked sheet clamped by the sheet clamping device onto the stacking platform.

[0016] Wherein, the first end of the stacking platform is close to the end of the patching device, and the second end of the patch clamping device is close to the end of the stacking platform.

[0017] Optionally, the sheet clamping device is in two sets, and the two sets of sheet clamping devices alternately lay the stacked sheets onto the stacking table.

[0018] Secondly, a method for stacking battery cells, the method comprising:

[0019] The negative electrode and positive electrode are symmetrically attached to the traction diaphragm to form the i-th laminated sheet body;

[0020] The first and second ends of the i-th stacked sheet are held in place by a sheet clamping device.

[0021] The sheet clamping device and the stacking stage are controlled to perform relative circular arc movements so as to stack the i-th layered sheet on the stacking stage.

[0022] Optionally, the step of symmetrically attaching the negative electrode and the positive electrode to the traction diaphragm includes:

[0023] On the traction diaphragm, a negative electrode and a positive electrode are symmetrically attached to the diaphragm at predetermined lengths, wherein the predetermined length is greater than the length of a negative electrode.

[0024] Optionally, controlling the relative circular arc movement between the sheet clamping device and the stacking stage to stack the clamped i-th layered sheet on the stacking stage includes:

[0025] The sheet clamping device is controlled to perform an arc motion with the first end of the stacking platform as the center, so as to stack the i-th layered sheet being clamped onto the stacking platform; or,

[0026] The stacking platform is controlled to move in an arc around the second end of the sheet clamping device to carry and receive the i-th stacked sheet clamped by the sheet clamping device on the stacking platform.

[0027] Wherein, the first end of the stacking platform is close to the end of the patching device, and the second end of the patch clamping device is close to the end of the stacking platform.

[0028] Optionally, after controlling the wafer clamping device and the stacking stage to perform relative circular arc motion to stack the clamped i-th laminated wafer on the stacking stage, the cell stacking method further includes:

[0029] The sheet clamping device is removed from the i-th stacked sheet being clamped;

[0030] Control the sheet clamping device to move to the clamping position and continue to clamp the first and second ends of the (i+1)th stacked sheet.

[0031] Optionally, before controlling the relative circular arc movement between the wafer clamping device and the stacking stage, the cell stacking method further includes:

[0032] A pressure plate is used to press down on the first end of the stacking platform near the patching device, so as to press down on the first end of the already stacked patch on the stacking platform;

[0033] After controlling the wafer clamping device and the stacking stage to perform relative circular arc motion to stack the i-th wafer on the stacking stage, the cell stacking method further includes:

[0034] Remove the pressure plate from the stacking platform.

[0035] Based on the above technical features, this application can achieve at least the following beneficial effects:

[0036] By performing relative circular motion between the wafer clamping device and the stacking stage, the laminated wafers held by the wafer clamping device and the diaphragm that has not yet formed a laminated wafer are kept in a taut state, which avoids wrinkles during the diaphragm folding process and improves the quality of cell stacking.

[0037] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0039] Figure 1 This is a schematic diagram of a cell stacking device provided in one embodiment of this application;

[0040] Figure 2 yes Figure 1 The diagram shown illustrates the process of a single-stage cell stacking device.

[0041] Figure 3 This is a schematic diagram of a cell stacking device provided in another embodiment of this application;

[0042] Figure 4 yes Figure 3 The diagram shown illustrates the process of a single-stage cell stacking device.

[0043] Figure 5 This is a schematic diagram of a cell stacking device provided in another embodiment of this application;

[0044] Figure 6 yes Figure 5 The diagram shown illustrates the process of a single-stage cell stacking device.

[0045] Figure 7 yes Figure 1 Another schematic diagram of the cell stacking equipment shown in the figure, when a single layer of cells is stacked;

[0046] Figure 8 This is a flowchart of a cell stacking method provided in one embodiment of this application. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0048] The cell stacking equipment provided in this application pre-attaches the negative electrode and positive electrode sheets onto the separator to form a stacked sheet body. The stacked sheet body is then placed on a stacking table, maintaining a relative circular motion between the stacked sheet body and the stacking table to ensure the separator between the stacked sheet body and the stacking table remains taut, greatly improving the stacking quality. The following describes the process in conjunction with... Figure 1 , Figure 3 , Figure 5 The battery cell stacking equipment provided in this application is illustrated with examples.

[0049] Figure 1 This is a schematic diagram of a cell stacking device provided in one embodiment of the present application. The cell stacking device provided in the present application can include a diaphragm feeding device, a negative electrode feeding device, a positive electrode feeding device, a bonding device, a wafer clamping device 10, and a stacking stage 20.

[0050] A diaphragm feeding device provides a diaphragm 30. In some embodiments of this application, the diaphragm feeding device provides a continuous diaphragm to the stacking table 20.

[0051] The bonding device is located between the diaphragm feeding device and the stacking table 20. It is used to symmetrically attach the negative electrode sheet provided by the negative electrode sheet feeding device and the positive electrode sheet provided by the positive electrode sheet feeding device to the diaphragm 30 pulled out from the diaphragm feeding device to form a laminated sheet body 40.

[0052] Generally speaking, the positive and negative electrode plates are the same size and are symmetrically attached to both sides of the separator 30 to form a laminated sheet body 40. That is, the projections of the positive and negative electrode plates symmetrically attached to both sides of the separator 30 on the separator 30 are the same.

[0053] The sheet clamping device 10 clamps the first and second ends of the stacked sheet 40.

[0054] The sheet clamping device 10 and the stacking stage 20 perform relative circular arc movements to stack the clamped sheet 40 onto the stacking stage.

[0055] The sheet clamping device 10 provided in this application may include a first clamping part 11 and a second clamping part 12, the first clamping part 11 and the second clamping part 12 being used to clamp the first end and the second end of the stacked sheet 40, respectively.

[0056] In one possible implementation, the stacked sheets 40 held by the sheet clamping device 10 can maintain a horizontal angle or be slightly tilted during movement. For the need to tilt, such as... Figure 3 As shown, the sheet clamping device 10 may further include a first guide rail 13 and a second guide rail 14, both of which are vertically arranged. The first clamping part 11 is mounted on the first guide rail 13 and configured to move up and down along the first guide rail 13, and the second clamping part 12 is mounted on the second guide rail 14 and configured to move up and down along the second guide rail 14.

[0057] The first guide rail 13 and the second guide rail 14 here can have the same stroke length, and both are set vertically.

[0058] When the first clamping part 11 and the second clamping part 12 move along the first guide rail 13 and the second guide rail 14 respectively, the heights of the first clamping part 11 and the second clamping part 12 are different, so that the clamped stacked sheet 40 forms an inclined angle, avoiding damage to the electrode sheet on the stacked sheet 40 that may be caused when the stacked sheet 40 moves in an arc around the stacking table.

[0059] Optionally, the sheet clamping device 10 may further include a tension holding mechanism 15, which is fixedly connected to the first clamping part 11 and the second clamping part 12 to ensure that the distance between the first clamping part 11 and the second clamping part 12 is fixed.

[0060] The tension holding mechanism 15 keeps the distance between the first clamping part 11 and the second clamping part 12 fixed, thus preventing damage to the electrode sheet caused by changes in the distance between the two clamping parts during movement.

[0061] In practical applications, please refer to Figure 5 As shown, the battery cell stacking equipment may also include an auxiliary tension roller device 50, which is disposed between the wafer clamping device 10 and the stacking table 20 and is configured to provide auxiliary tension to the diaphragm 30 between the stacked wafers 40 held by the wafer clamping device 10 and the stacking table 20.

[0062] In practical applications, the auxiliary tension roller device 50 moves with the sheet clamping device 10 or the stacking table 20 to always keep the diaphragm between the sheet clamping device 10 and the stacking table 20 taut. When the stacked sheet 40 held by the sheet clamping device 10 covers or is about to cover the stacking table 20, the auxiliary tension roller device 50 is pulled away from above the stacking table 20.

[0063] To prevent the stacked wafers 40 on the stacking table 20 from shifting, the cell stacking equipment provided in this application may further include a pressure plate, which is configured to press against the first end of the stacking table 20 near the diaphragm 30 feeding device and is configured to be removable from the first end of the stacking table 20.

[0064] When the sheet clamping device 10 and the stacking stage 20 move relative to each other in a circular arc, it can be done in at least the following two ways:

[0065] The first method involves the sheet clamping device 10 moving in an arc around the first end of the stacking table 20 to stack the clamped sheet 40 onto the stacking table. Here, the first end of the stacking table 20 is the end closest to the patch attaching device. In this method, the stacking table 20 remains fixed, and the sheet clamping device 10 moves in an arc around the first end of the stacking table 20, as shown below. Figure 2 , Figure 4 and Figure 6 As shown.

[0066] In the second method, the stacking table 20 moves in an arc around the second end of the sheet clamping device 10 to receive the stacked sheet 40 held by the sheet clamping device 10 onto the stacking table 20. The second end of the sheet clamping device 10 is the end closest to the stacking table 20. In this method, the sheet clamping device remains fixed, and the stacking table 20 moves in an arc around the second end of the sheet clamping device 10, such as... Figure 7 As shown.

[0067] To improve the efficiency of stacking, there are two sets of sheet clamping devices 10, and the two sets of sheet clamping devices 10 alternately lay the stacked sheets 40 onto the stacking table 20.

[0068] In summary, the cell stacking equipment provided in this application, by performing relative circular arc movements between the wafer clamping device and the stacking stage, keeps the stacked wafers held by the wafer clamping device and the diaphragm that has not yet formed a stacked wafer in a taut state, avoiding wrinkles during the diaphragm folding process and improving the quality of cell stacking.

[0069] Figure 8 This is a flowchart of a cell stacking method provided in one embodiment of this application. The cell stacking method provided in this application may include the following steps:

[0070] Step 801: The negative electrode and the positive electrode are symmetrically attached to the traction separator to form the i-th laminated sheet body;

[0071] On the traction diaphragm, a negative electrode and a positive electrode are symmetrically attached to the diaphragm at predetermined lengths, the predetermined lengths being longer than the length of a negative electrode.

[0072] Step 802: Use the sheet clamping device to clamp the first and second ends of the i-th stacked sheet;

[0073] Generally speaking, the i-th stacked sheet held by the sheet clamping device is in a horizontal state in the initial position.

[0074] Step 803: Control the sheet clamping device and the stacking stage to perform relative circular arc movement so as to stack the i-th layer sheet being clamped onto the stacking stage.

[0075] When performing step 803, in the first method, the sheet clamping device is controlled to perform an arc movement with the first end of the stacking stage as the center, so as to stack the i-th layer sheet being clamped onto the stacking stage.

[0076] The second method involves controlling the stacking stage to move in an arc around the second end of the sheet clamping device, so as to carry and receive the i-th stacked sheet held by the sheet clamping device onto the stacking stage.

[0077] The first end of the stacking platform mentioned here is the end closest to the patch assembly, and the second end of the patch clamping device is the end closest to the stacking platform.

[0078] After step 803, the sheet clamping device can be removed from the i-th stacked sheet being clamped; the sheet clamping device is controlled to move to the clamping position to continue clamping the first and second ends of the (i+1)-th stacked sheet.

[0079] To prevent the stacked pieces on the stacking table from shifting, before step 803, a pressure plate can be used to press down on the first end of the stacking table near the patch assembly to press down on the first end of the already stacked pieces on the stacking table; after step 803, the pressure plate is removed from the stacking table.

[0080] Obviously, if such as Figure 5 The cell stacking equipment shown in the figure also requires, after step 803, the auxiliary tension roller device 50 to be removed from above the stacking table 20 and reset.

[0081] In summary, the cell stacking method provided in this application, by performing relative circular arc motion between the wafer clamping device and the stacking stage, keeps the stacked wafers held by the wafer clamping device and the diaphragm that has not formed a stacked wafer in a taut state, avoiding wrinkles during the diaphragm folding process and improving the quality of cell stacking.

[0082] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention described herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

[0083] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A cell stacking device, characterized in that, The cell stacking equipment includes a separator feeding device, a negative electrode feeding device, a positive electrode feeding device, a bonding device, a wafer clamping device, and a stacking table, wherein: The diaphragm feeding device provides the diaphragm; The patching device is located between the diaphragm feeding device and the stacking platform, and is used to symmetrically attach the negative electrode sheet provided by the negative electrode sheet feeding device and the positive electrode sheet provided by the positive electrode sheet feeding device to the diaphragm pulled out from the diaphragm feeding device to form a laminated sheet body. The sheet clamping device clamps the first and second ends of the stacked sheet; The sheet clamping device and the stacking table perform relative arc motion, so that the stacked sheets held by the sheet clamping device and the diaphragm that has not formed a stacked sheet are in a taut state, so as to stack the held stacked sheets on the stacking table. The sheet clamping device moves in an arc around the first end of the stacking platform to stack the clamped sheet onto the stacking platform; wherein the first end of the stacking platform is the end closest to the patching device. The sheet clamping device includes a first clamping part and a second clamping part, the first clamping part and the second clamping part being used to clamp the first end and the second end of the stacked sheet, respectively; The sheet clamping device further includes a first guide rail and a second guide rail, both arranged vertically. The first clamping part is mounted on the first guide rail and configured to move up and down along the first guide rail, and the second clamping part is mounted on the second guide rail and configured to move up and down along the second guide rail.

2. The cell stacking equipment according to claim 1, characterized in that, The sheet clamping device further includes a tension maintaining mechanism, which is fixedly connected to the first clamping part and the second clamping part to ensure that the distance between the first clamping part and the second clamping part is fixed.

3. The cell stacking equipment according to claim 1, characterized in that, The cell stacking equipment also includes an auxiliary tension roller device, which is disposed between the wafer clamping device and the stacking table and is configured to provide auxiliary tension to the diaphragm between the laminated wafers held by the wafer clamping device and the stacking table.

4. The cell stacking equipment according to claim 1, characterized in that, The cell stacking equipment also includes a pressure plate configured to press against a first end of the stacking table near the diaphragm feeding device and configured to be removable from the first end of the stacking table.

5. The cell stacking equipment according to claim 1, characterized in that, The sheet clamping device consists of two sets, which alternately place the stacked sheets onto the stacking platform.

6. A method for stacking battery cells, characterized in that, The cell stacking method employs the cell stacking equipment as described in any one of claims 1-5, and the cell stacking method includes: The negative electrode and positive electrode are symmetrically attached to the traction diaphragm to form the i-th laminated sheet body; The first and second ends of the i-th stacked sheet are held in place by a sheet clamping device. Controlling the sheet clamping device and the stacking stage to perform relative circular arc motion, so that the stacked sheets held by the sheet clamping device and the diaphragm that has not formed a stacked sheet are in a taut state, so as to stack the i-th stacked sheet on the stacking stage, including: The sheet clamping device is controlled to perform an arc motion with the first end of the stacking platform as the center, so as to stack the i-th layered sheet on the stacking platform; wherein, the first end of the stacking platform is the end close to the patching device.

7. The cell stacking method according to claim 6, characterized in that, The process of symmetrically attaching the negative and positive electrode plates to the traction diaphragm includes: On the traction diaphragm, a negative electrode and a positive electrode are symmetrically attached to the diaphragm at predetermined lengths, wherein the predetermined length is greater than the length of a negative electrode.

8. The cell stacking method according to claim 6, characterized in that, After controlling the wafer clamping device and the stacking stage to perform relative circular arc motion to stack the i-th wafer on the stacking stage, the cell stacking method further includes: The sheet clamping device is removed from the i-th stacked sheet being clamped; Control the sheet clamping device to move to the clamping position and continue to clamp the first and second ends of the (i+1)th stacked sheet.

9. The cell stacking method according to claim 6, characterized in that, Before the control of the wafer clamping device and the stacking stage to perform relative circular arc movement, the cell stacking method further includes: A pressure plate is used to press down on the first end of the stacking platform near the patching device, so as to press down on the first end of the already stacked patch on the stacking platform; After controlling the wafer clamping device and the stacking stage to perform relative circular arc motion to stack the i-th wafer on the stacking stage, the cell stacking method further includes: Remove the pressure plate from the stacking platform.

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