Lamination device of battery cell and pole piece unit

Abstract

The utility model relates to a lamination device of a battery cell and pole piece units, the battery cell comprises a middle unit, the middle unit comprises a plurality of first pole piece units which are sequentially laminated, and each first pole piece unit comprises a first diaphragm, a positive pole piece, a third diaphragm, a negative pole piece and a second diaphragm which are sequentially arranged; the first diaphragm, the positive plate, the third diaphragm, the negative plate and the second diaphragm are connected together in a hot pressing manner, and the sum of the thicknesses of the first diaphragm and the second diaphragm is the same as the thickness of the third diaphragm. According to the utility model, the thickness of the first pole piece unit is relatively thin, and when the first pole piece unit is independently hot-pressed, the pole piece and the diaphragm of the first pole piece unit can be well connected together, so that the interface bonding effect in the battery cell is relatively good; after a plurality of first pole piece units are overlapped, the thicknesses of diaphragms between adjacent positive pole pieces and negative pole pieces are the same, so that the performance of the battery cell is ensured; and different layers of diaphragms of the middle unit of the battery cell are not connected and can be independently scrapped, so that the yield of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a stacking device of a battery core and a pole piece unit. Background Art

[0002] In the production process of battery cells, hot pressing is an important process. After hot pressing, on the one hand, the thickness of the battery cells can be guaranteed to be consistent, which is convenient for the subsequent battery cells to be put into the shell. On the other hand, the battery cells can be shaped to eliminate the wrinkles and air in the diaphragm. Moreover, the distance that lithium ions travel between the positive and negative electrodes can be shortened, and the internal resistance of the battery cells can be reduced. During hot pressing, a certain temperature and pressure need to be applied to the battery cells and maintained for a certain time. In the prior art, the battery cells are generally hot pressed after the winding or lamination is completed. There are the following problems in hot pressing the battery cells after the winding or lamination is completed: ① The battery cells have a certain thickness, and the hot pressing mechanism can usually only heat from the outermost layer of the battery cells, so the temperature inside the battery cells is relatively low, resulting in poor adhesion of the internal interface of the battery cells; ② The battery multilayer diaphragms made by the lamination process are connected. If a certain layer of the pole piece has poor coating, or defects such as bumps and falling during the lamination manufacturing process, the entire battery cell needs to be scrapped, resulting in a low battery cell quality rate. Utility Model Content

[0003] To this end, the utility model provides a stacking device of a battery cell and a pole piece unit, which can improve the internal interface bonding effect of the battery cell and the battery cell quality rate.

[0004] In order to solve the above technical problems, the utility model provides a battery cell, comprising an intermediate unit, wherein the intermediate unit comprises one or a plurality of first pole piece units sequentially stacked along a set direction;

[0005] The first electrode unit includes a first diaphragm, a positive electrode, a third diaphragm, a negative electrode and a second diaphragm arranged in sequence. The first diaphragm, the positive electrode, the third diaphragm, the negative electrode and the second diaphragm are connected together by hot pressing. The sum of the thickness of the first diaphragm and the second diaphragm is the same as the thickness of the third diaphragm.

[0006] Furthermore, the intermediate unit further includes a second pole piece unit and a third pole piece unit;

[0007] The second pole piece unit comprises a first diaphragm, a positive pole piece and a third diaphragm. In the second pole piece unit, the positive pole piece is arranged between the first diaphragm and the third diaphragm, and the first diaphragm of the second pole piece unit is stacked with the outermost second diaphragm of the plurality of first pole piece units;

[0008] The third electrode sheet unit includes a second separator, a negative electrode sheet, and a third separator. In the third electrode sheet unit, the negative electrode sheet is disposed between the second separator and the third separator, and the second separator of the third electrode sheet unit is stacked with the outermost first separator among the plurality of first electrode sheet units.

[0009] Further, the first electrode sheet unit, the second electrode sheet unit, and the third electrode sheet unit are thermally pressed and connected together.

[0010] Further, the first separator and the second separator have the same thickness.

[0011] Further, between the head end of the intermediate unit and the head end of the battery cell, and between the tail end of the intermediate unit and the tail end of the battery cell, there are alternately arranged positive electrode sheets and negative electrode sheets and a third separator disposed between the positive electrode sheet and the negative electrode sheet; wherein, among the two layers of electrode sheets closest to the head end and the tail end of the battery cell, both are negative electrode sheets or one is a positive electrode sheet and the other is a negative electrode sheet respectively.

[0012] The present utility model further includes a laminating device for electrode sheet units, comprising:

[0013] A first separator feeding mechanism for carrying a first separator coil and unrolling the first separator coil;

[0014] A second separator feeding mechanism for carrying a second separator coil and unrolling the second separator coil;

[0015] A third separator feeding mechanism for carrying a third separator coil and unrolling the third separator coil;

[0016] A first electrode sheet feeding mechanism for carrying multiple layers of positive electrode sheets and releasing the positive electrode sheets;

[0017] A second electrode sheet feeding mechanism for carrying multiple layers of negative electrode sheets and releasing the negative electrode sheets;

[0018] A stacking mechanism for carrying the electrode sheet units;

[0019] A first electrode sheet grasping mechanism for transporting the positive electrode sheets released by the first electrode sheet feeding mechanism to the stacking mechanism;

[0020] A second electrode sheet grasping mechanism for transporting the negative electrode sheets released by the second electrode sheet feeding mechanism to the stacking mechanism;

[0021] A separator grasping mechanism for sending the first separator released by the first separator feeding mechanism, or the second separator released by the second separator feeding mechanism, or the third separator released by the third separator feeding mechanism to the stacking mechanism;

[0022] A diaphragm cutting mechanism for cutting the first diaphragm, the second diaphragm or the third diaphragm provided on the stacking mechanism;

[0023] A hot pressing mechanism for hot pressing the electrode sheet unit produced by the stacking mechanism;

[0024] A discharging mechanism for removing the hot-pressed electrode sheet unit.

[0025] Further, the first electrode sheet loading mechanism and the second electrode sheet loading mechanism are respectively arranged on both sides of the stacking mechanism in the first direction. A first position adjusting mechanism for carrying and adjusting the position of the positive electrode sheet is arranged between the first electrode sheet loading mechanism and the stacking mechanism, and a second position adjusting mechanism for carrying and adjusting the position of the negative electrode sheet is arranged between the second electrode sheet loading mechanism and the stacking mechanism.

[0026] Further, the stacking mechanism is arranged on a first track mechanism, and the first track mechanism is configured to drive the stacking mechanism to move among a stacking station where the stacking mechanism is located, a hot pressing station where the hot pressing mechanism is located, and a discharging station where the discharging mechanism is located.

[0027] Further, the diaphragm grasping mechanism is arranged on a second track mechanism, and the second track mechanism is configured to drive the diaphragm grasping mechanism to move among a stacking station where the stacking mechanism is located, a first loading station where the first diaphragm loading mechanism is located, a second loading station where the second diaphragm loading mechanism is located, and a third loading station where the third diaphragm loading mechanism is located;

[0028] The first electrode sheet grasping mechanism is arranged on a third track mechanism, and the third track mechanism is configured to drive the first electrode sheet grasping mechanism to move among a fourth loading station where the first electrode sheet loading mechanism is located, a first position adjusting station where the first position adjusting mechanism is located, and a stacking station where the stacking mechanism is located;

[0029] The second electrode sheet grasping mechanism is arranged on a fourth track mechanism, and the fourth track mechanism is configured to drive the second electrode sheet grasping mechanism to move among a fifth loading station where the second electrode sheet loading mechanism is located, a second position adjusting station where the second position adjusting mechanism is located, and a stacking station where the stacking mechanism is located;

[0030] The diaphragm cutting mechanism is arranged on a fifth track mechanism, and the fifth track mechanism is configured to drive the diaphragm cutting mechanism to perform diaphragm cutting work at the stacking station where the stacking mechanism is located;

[0031] The hot pressing mechanism is arranged on a sixth track mechanism, and the sixth track mechanism is configured to drive the hot pressing mechanism to perform hot pressing work on the electrode sheet unit carried by the stacking mechanism;

[0032] The discharging mechanism is arranged on the seventh track mechanism, and the seventh track mechanism is configured to drive the discharging mechanism to take the electrode sheet unit carried by the stacking mechanism away.

[0033] Furthermore, the stacking mechanism includes a workbench which has a stacking area. Diaphragm pressing components are arranged on both sides of the stacking area on the workbench. The diaphragm pressing components include pressing blocks and drivers, and the drivers drive the pressing blocks to move so as to press or release the first diaphragm, the second diaphragm or the third diaphragm.

[0034] The above technical solution of the present utility model has the following advantages compared with the prior art: The middle unit of the battery cell of the present utility model includes one or more first electrode sheet units. On the one hand, each first electrode sheet unit includes two layers of electrode sheets and three layers of diaphragms, and the thickness of the first electrode sheet unit is relatively thin. The electrode sheets and diaphragms of the first electrode sheet unit can be well thermally pressed and connected together. The inside of the battery cell is the above-mentioned first electrode sheet unit, so that the interfacial bonding effect inside the battery cell is better. On the other hand, the outermost layers of each first electrode sheet unit are the first diaphragm and the second diaphragm respectively. After multiple first electrode sheet units are stacked, the thickness of the diaphragms between adjacent positive electrode sheets and negative electrode sheets is the same, ensuring the performance of the battery cell. Moreover, the different layers of diaphragms in the middle unit of the battery cell are not connected to each other and can be independently scrapped, improving the yield rate of the battery cell. The lamination device of the electrode sheet unit of the present utility model realizes the automatic lamination of the electrode sheet unit. Description of the Drawings

[0035] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model and in conjunction with the attached drawings.

[0036] Figure 1 It is a schematic structural diagram of the first electrode sheet unit in the present utility model;

[0037] Figure 2 It is a schematic structural diagram of the second electrode sheet unit in the present utility model;

[0038] Figure 3 It is a schematic structural diagram of the third electrode sheet unit in the present utility model;

[0039] Figure 4 It is a schematic structural diagram of the battery cell in the present utility model;

[0040] Figure 5 It is a schematic diagram of the lamination device of the electrode sheet unit in the present utility model;

[0041] Figure 6 It is a partial schematic diagram of the lamination device of the electrode sheet unit in the present utility model.

[0042] Description of the reference numerals in the drawings of the specification: A, the first pole piece unit; B, the second pole piece unit; C, the third pole piece unit; 11, the first separator; 12, the second separator; 13, the positive electrode plate; 14, the negative electrode plate; 15, the third separator;

[0043] 21, the first pole piece feeding mechanism; 22, the first position adjusting mechanism; 23, the second pole piece feeding mechanism; 24, the second position adjusting mechanism; 25, the first separator feeding mechanism; 26, the second separator feeding mechanism; 27, the third separator feeding mechanism; 28, the stacking mechanism; 281, the separator pressing assembly; 29, the first pole piece grasping mechanism; 210, the second pole piece grasping mechanism; 211, the separator grasping mechanism; 212, the separator cutting mechanism; 213, the hot pressing mechanism; 215, the discharging mechanism. Detailed implementation mode

[0044] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0045] See Figures 1 to 4 As shown, an embodiment of the battery cell provided by the present invention.

[0046] The above-mentioned battery cell includes an intermediate unit, and the above-mentioned intermediate unit includes one or a plurality of first pole piece units stacked in sequence along a set direction;

[0047] The above-mentioned first pole piece unit A includes a first separator 11, a positive electrode plate 13, a third separator 15, a negative electrode plate 14, and a second separator 12 arranged in sequence. The first separator 11, the positive electrode plate 13, the third separator 15, the negative electrode plate 14, and the second separator 12 are connected together by hot pressing. The sum of the thicknesses of the first separator 11 and the second separator 12 is the same as the thickness of the third separator 15.

[0048] The above-mentioned battery cell is the core component of the battery. The main function of the above-mentioned positive electrode sheet 13 is to accept electrons and release positive ions for oxidation reaction. The main function of the above-mentioned negative electrode sheet 14 is to release electrons and absorb positive ions for reduction reaction. The main functions of the above-mentioned first separator 11, second separator 12 and third separator 15 are to isolate the positive and negative electrodes and prevent safety problems such as short circuit, overcharge and over-discharge. The thickness directions of the first separator 11, positive electrode sheet 13, third separator 15, negative electrode sheet 14 and second separator 12 of the same battery cell are the same, that is, the thickness direction of the battery cell. The first separator 11, positive electrode sheet 13, third separator 15, negative electrode sheet 14 and second separator 12 of the same first electrode unit A are thermally pressed and connected. The first separators 11 and second separators 12 of two adjacent first electrode units A are stacked together and also thermally pressed and connected. That is to say, after each first electrode unit A is thermally pressed separately, different first electrode units A are thermally pressed together as a whole.

[0049] By setting the middle unit of the battery cell to include one or more first electrode units A, on the one hand, each first electrode unit A includes two layers of electrode sheets (positive electrode sheet 13 and negative electrode sheet 14) and three layers of separators (first separator 11, second separator 12 and third separator 15). The thickness of the first electrode unit A is relatively thin, and the electrode sheets and separators of the first electrode unit A can be better thermally pressed and connected together, so that the interfacial bonding effect inside the battery cell is better; on the other hand, the outermost layers of each first electrode unit A are the first separator 11 and the second separator 12 respectively. After multiple first electrode units A are stacked, the thickness of the separator between the adjacent positive electrode sheet 13 and negative electrode sheet 14 is the same, ensuring the performance of the battery cell.

[0050] In this embodiment, the above-mentioned middle unit further includes a second electrode unit B and a third electrode unit C;

[0051] The above-mentioned second electrode unit B includes a first separator 11, a positive electrode sheet 13 and a third separator 15. In the above-mentioned second electrode unit B, the above-mentioned positive electrode sheet 13 is arranged between the above-mentioned first separator 11 and the above-mentioned third separator 15. The first separator 11 of the above-mentioned second electrode unit B is stacked with the outermost second separator 12 among the above-mentioned multiple first electrode units A;

[0052] The above-mentioned third electrode unit C includes a second separator 12, a negative electrode sheet 14 and a third separator 15. In the above-mentioned third electrode unit C, the above-mentioned negative electrode sheet 14 is arranged between the above-mentioned second separator 12 and the above-mentioned third separator 15. The second separator 12 of the above-mentioned third electrode unit C is stacked with the outermost first separator 11 among the above-mentioned multiple first electrode units A.

[0053] When the middle unit of the above-mentioned battery cell only includes the first electrode sheet unit A, the outermost layers of the middle unit are the first separator 11 and the second separator 12 respectively, and the thicknesses of the first separator 11 and the second separator 12 are less than the thickness of the third separator 15. If other positive electrode sheets and negative electrode sheets are to be stacked outside the middle unit, it will cause the separator thickness at the head and tail ends of the middle unit to be inconsistent with the separator thickness inside the middle unit, affecting the performance of the battery. By setting the second electrode sheet unit B and the third electrode sheet unit C, the thicknesses of the separators at the head and tail ends of the middle unit are the same as the thicknesses of the separators inside the middle unit. When stacked with other positive electrode sheets or negative electrode sheets later, there will be no problem of inconsistent separator thickness in the same battery cell.

[0054] In this embodiment, the above-mentioned first electrode sheet unit A, the above-mentioned second electrode sheet unit B, and the above-mentioned third electrode sheet unit C are thermally pressed and connected together.

[0055] First, the first electrode sheet unit A, the second electrode sheet unit B, and the third electrode sheet unit C are each thermally pressed separately, and then the separately thermally pressed first electrode sheet unit A, the separately thermally pressed second electrode sheet unit B, and the separately thermally pressed third electrode sheet unit C are thermally pressed together as a whole. By thermally pressing and connecting the first electrode sheet unit A, the second electrode sheet unit B, and the third electrode sheet unit C together to form the middle unit, so as to subsequently arrange the middle unit in the middle of the battery cell, thus solving the problem that the temperature in the middle of the existing battery cell is relatively low and there is a problem of thermal pressing connection inside the battery cell.

[0056] In this embodiment, the thicknesses of the above-mentioned first separator 11 and the above-mentioned second separator 12 are the same.

[0057] In order to ensure the consistency of the separator thickness in the same battery cell, the sum of the thicknesses of the first separator 11 and the second separator 12 should be the same as the thickness of the third separator 15. If the thicknesses of the first separator 11 and the second separator 12 are different, three kinds of thickness separators need to be prepared. If the thicknesses of the first separator 11 and the second separator 12 are the same, only two kinds of thickness separators need to be prepared. By setting the thicknesses of the above-mentioned first separator 11 and the second separator 12 to be the same, there are only two kinds of thickness separators in the whole battery cell, which is convenient for preparing the raw materials for making the battery cell.

[0058] In this embodiment, between the head end of the above-mentioned middle unit and the head end of the above-mentioned battery cell, and between the tail end of the above-mentioned middle unit and the tail end of the above-mentioned battery cell, there are alternately arranged positive electrode sheets 13 and negative electrode sheets 14 and a third separator 15 arranged between the positive electrode sheets 13 and the negative electrode sheets 14; among them, in the two layers of electrode sheets closest to the head end and the tail end of the above-mentioned battery cell, both are negative electrode sheets 14 or one is a positive electrode sheet 13 and the other is a negative electrode sheet 14.

[0059] When the pyroelectric cell is formed in a traditional way, heat is relatively easy to transfer to the outer part of the cell, but it is very difficult to transfer to the central part of the cell. Therefore, it is designed that the central part of the cell adopts the above middle unit, the outer part of the cell is laminated in a traditional way, and then the whole cell is hot-pressed, so the influence on the overall production efficiency of the cell is relatively small.

[0060] See Figure 5 and Figure 6 shown in an embodiment of the laminating device for the pole piece unit of the present invention.

[0061] The above-mentioned laminating device for the pole piece unit includes:

[0062] The first separator feeding mechanism 25, which is used to carry the first separator coil and unwind the first separator coil;

[0063] The second separator feeding mechanism 26, which is used to carry the second separator coil and unwind the second separator coil;

[0064] The third separator feeding mechanism 27, which is used to carry the third separator coil and unwind the third separator coil;

[0065] The first pole piece feeding mechanism 21, which is used to carry multiple layers of positive pole pieces and release the positive pole pieces;

[0066] The second pole piece feeding mechanism 23, which is used to carry multiple layers of negative pole pieces and release the negative pole pieces;

[0067] The stacking mechanism 28, which is used to carry the pole piece unit;

[0068] The first pole piece gripping mechanism 29, which is used to transport the positive pole piece released by the above-mentioned first pole piece feeding mechanism 21 to the above-mentioned stacking mechanism 28;

[0069] The second pole piece gripping mechanism 210, which is used to transport the negative pole piece released by the above-mentioned second pole piece feeding mechanism 23 to the above-mentioned stacking mechanism 28;

[0070] The separator gripping mechanism 211, which is used to send the first separator released by the above-mentioned first separator feeding mechanism 25 or the second separator released by the above-mentioned second separator feeding mechanism 26 or the third separator released by the above-mentioned third separator feeding mechanism 27 to the above-mentioned stacking mechanism 28;

[0071] The separator cutting mechanism 212, which is used to cut off the first separator or the second separator or the third separator arranged on the above-mentioned stacking mechanism 28;

[0072] The hot pressing mechanism 213, which is used to hot press the pole piece unit produced by the above-mentioned stacking mechanism 28;

[0073] The discharging mechanism 215, which is used to remove the hot-pressed pole piece unit.

[0074] After the separator and the electrode sheets of the battery cell are manufactured, they basically exist in the form of material rolls. When manufacturing a wound battery cell, the separator and the electrode sheets are directly used in the form of material rolls. When manufacturing a stacked battery cell, the electrode sheets need to be cut into individual pieces for use. In the battery cell of this embodiment, since multiple electrode sheet units need to be manufactured, the above-mentioned electrode sheets are cut into individual pieces for use, and the first separator 11, the second separator 12, and the third separator 15 are used in the form of material rolls.

[0075] The above-mentioned first separator feeding mechanism 25, second separator feeding mechanism 26, and third separator feeding mechanism 27 are all unwinding mechanisms, which can be active unwinding mechanisms (the separator material roll rotates and unwinds by itself) or passive unwinding mechanisms (the separator material roll is driven to unwind when the separator is pulled).

[0076] The above-mentioned first electrode sheet feeding mechanism 21 and second electrode sheet feeding mechanism 23 both include a carrying platform. Multiple positive electrode sheets 13 are placed on the first electrode sheet feeding mechanism 21, and multiple negative electrode sheets 14 are placed on the second electrode sheet feeding mechanism 23. This carrying platform can be a lifting feeding platform (that is, every time an electrode sheet is taken away, the lifting platform rises one grid), which is convenient for the first electrode sheet gripping mechanism 29 and the second electrode sheet gripping mechanism 210 to grip the electrode sheets.

[0077] The above-mentioned stacking mechanism 28 includes a carrying platform, which is used to receive the first separator 11, the positive electrode sheet 13, the third separator 15, the negative electrode sheet 14, and the second separator 12, so that the first separator 11, the positive electrode sheet 13, the third separator 15, the negative electrode sheet 14, and the second separator 12 are stacked to form an electrode sheet unit, and it is convenient for subsequent hot pressing of the electrode sheet unit.

[0078] The above-mentioned first electrode sheet gripping mechanism 29 is used to grip the positive electrode sheet, and the second electrode sheet gripping mechanism 210 is used to grip the negative electrode sheet. The gripping method is generally clamping or vacuum suction. In order to reduce damage to the electrode sheets, the above-mentioned first electrode sheet gripping mechanism 29 and second electrode sheet gripping mechanism 210 are preferably vacuum suction cups.

[0079] The above-mentioned separator gripping mechanism 211 is used to grip the separator. Since the separator is a breathable material, it is not suitable to use the vacuum suction method for gripping. The above-mentioned separator gripping mechanism 211 is set as a gripper. The above-mentioned separator gripping mechanism 211 clamps the separator and pulls the separator to move above the stacking mechanism 28.

[0080] The above-mentioned separator cutting mechanism 212 is used to disconnect the separator and cut the separator stacked with the electrode sheets.

[0081] The above-mentioned hot pressing mechanism 213 heats and applies pressure to the electrode sheet unit, so that the separator of the electrode sheet unit is thermally pressed and connected to the electrode sheet.

[0082] The above-mentioned discharging mechanism 215 is used to take the pole piece unit away from the stacking mechanism 28. The above-mentioned discharging mechanism 215 grabs or lifts the pole piece unit. The grabbing method is generally clamping or vacuum suction. In order to reduce the damage to the pole piece unit, the above-mentioned discharging mechanism 215 is preferably a vacuum chuck.

[0083] The lamination device of the above-mentioned pole piece unit realizes the automatic preparation of the first pole piece unit A, the second pole piece unit B, and the third pole piece unit C.

[0084] In this embodiment, the above-mentioned first pole piece feeding mechanism 21 and the above-mentioned second pole piece feeding mechanism 23 are respectively arranged on both sides of the above-mentioned stacking mechanism 28 in the first direction. A first position adjustment mechanism 22 for carrying and adjusting the position of the positive pole piece is arranged between the above-mentioned first pole piece feeding mechanism 21 and the above-mentioned stacking mechanism 28. A second position adjustment mechanism 24 for carrying and adjusting the position of the negative pole piece is arranged between the above-mentioned second pole piece feeding mechanism 23 and the above-mentioned stacking mechanism 28.

[0085] The above-mentioned first position adjustment mechanism 22 can detect the pose of the positive pole piece and adjust the pose of the positive pole piece so that the positive pole piece is consistent with the set pose. The above-mentioned second position adjustment mechanism 24 can detect the pose of the negative pole piece and adjust the pose of the negative pole piece so that the negative pole piece is consistent with the set pose. The above-mentioned first position adjustment mechanism 22 and the above-mentioned second position adjustment mechanism 24 generally include a detection component for detecting the pose of the pole piece and an adjustment component for driving the pole piece to change its pose. The above-mentioned detection component is preferably a CCD (vision detection camera). Both the above-mentioned first position adjustment mechanism 22 and the second position adjustment mechanism 24 are CCD platforms. By setting the first position adjustment mechanism 22 and the second position adjustment mechanism 24, it is ensured that the positive pole piece and the negative pole piece are stacked in the correct pose, and the lamination quality of the pole piece unit is ensured.

[0086] In this embodiment, the above-mentioned stacking mechanism 28 is arranged on the first track mechanism. The above-mentioned first track mechanism is configured to drive the stacking mechanism 28 to move among the stacking station where the stacking mechanism 28 is located, the hot pressing station where the hot pressing mechanism 213 is located, and the discharging station where the discharging mechanism 215 is located.

[0087] When the above-mentioned stacking mechanism 28 is at the stacking station, it receives the positive electrode sheet sent by the first electrode sheet gripping mechanism 29, the negative electrode sheet sent by the second electrode sheet gripping mechanism 210, and the separator sent by the separator gripping mechanism 211. When the above-mentioned stacking mechanism 28 is at the hot pressing station, the hot pressing mechanism 213 hot presses the electrode sheet unit on the stacking mechanism 28. When the above-mentioned stacking mechanism 28 is at the discharging station, the discharging mechanism 215 transfers the electrode sheet unit away. Preferably, the above-mentioned first track mechanism drives the above-mentioned stacking mechanism 28 to move in a horizontal direction perpendicular to the first direction. By providing the first track mechanism for the stacking mechanism 28, the stacked electrode sheet unit moves, thereby completing hot pressing and discharging. The layout of the laminating device is reasonable and the laminating efficiency is relatively high.

[0088] In this embodiment, the above-mentioned separator gripping mechanism 211 is arranged on the second track mechanism, and the second track mechanism is configured to drive the above-mentioned separator gripping mechanism 211 to move among the stacking station where the above-mentioned stacking mechanism 28 is located, the first feeding station where the first separator feeding mechanism 25 is located, the second feeding station where the second separator feeding mechanism 26 is located, and the third feeding station where the third separator feeding mechanism 27 is located;

[0089] The above-mentioned first electrode sheet gripping mechanism 29 is arranged on the third track mechanism, and the third track mechanism is configured to drive the above-mentioned first electrode sheet gripping mechanism 29 to move among the fourth feeding station where the above-mentioned first electrode sheet feeding mechanism 21 is located, the first position adjustment station where the above-mentioned first position adjustment mechanism 22 is located, and the stacking station where the above-mentioned stacking mechanism 28 is located;

[0090] The above-mentioned second electrode sheet gripping mechanism 210 is arranged on the fourth track mechanism, and the fourth track mechanism is configured to drive the above-mentioned second electrode sheet gripping mechanism 210 to move among the fifth feeding station where the above-mentioned second electrode sheet feeding mechanism 23 is located, the second position adjustment station where the above-mentioned second position adjustment mechanism 24 is located, and the stacking station where the above-mentioned stacking mechanism 28 is located;

[0091] The above-mentioned separator cutting mechanism 212 is arranged on the fifth track mechanism, and the fifth track mechanism is configured to drive the above-mentioned separator cutting mechanism 212 to perform separator cutting work at the stacking station where the above-mentioned stacking mechanism 28 is located;

[0092] The above-mentioned hot pressing mechanism 213 is arranged on the sixth track mechanism, and the sixth track mechanism is configured to drive the above-mentioned hot pressing mechanism 213 to perform hot pressing work on the electrode sheet unit carried by the above-mentioned stacking mechanism 28;

[0093] The above-mentioned discharging mechanism 215 is arranged on the seventh track mechanism, and the seventh track mechanism is configured to drive the above-mentioned discharging mechanism 215 to carry away the electrode sheet unit carried by the above-mentioned stacking mechanism 28.

[0094] When the above-mentioned diaphragm gripping mechanism 211 is at the first loading station, it grips the first diaphragm 11 on the first diaphragm loading mechanism 25 and pulls the first diaphragm 11 to move; when the diaphragm gripping mechanism 211 is at the second loading station, it grips the second diaphragm 12 on the second diaphragm loading mechanism 26 and pulls the second diaphragm 12 to move; when the diaphragm gripping mechanism 211 is at the third loading station, it grips the third diaphragm 15 on the third diaphragm loading mechanism 27 and pulls the third diaphragm 15 to move.

[0095] When the above-mentioned first electrode sheet gripping mechanism 29 is at the fourth loading station, it grips the positive electrode sheet 13 on the first electrode sheet loading mechanism 21 and drives the positive electrode sheet 13 to move; when the first electrode sheet gripping mechanism 29 is at the first position adjustment station, it places the positive electrode sheet 13 on the first position adjustment mechanism 22 and removes the positive electrode sheet on the first position adjustment mechanism 22. When the first electrode sheet gripping mechanism 29 is at the stacking station, it places the positive electrode sheet 13 on the stacking mechanism 28. When the second electrode sheet gripping mechanism 210 is at the fifth loading station, it grips the negative electrode sheet 14 on the second electrode sheet loading mechanism 23 and drives the negative electrode sheet 14 to move. When the second electrode sheet gripping mechanism 210 is at the second position adjustment station, it places the negative electrode sheet 14 on the second position adjustment mechanism 24 and removes the negative electrode sheet on the second position adjustment mechanism 24. When the second electrode sheet gripping mechanism 210 is at the stacking station, it places the negative electrode sheet 14 on the stacking mechanism 28.

[0096] Preferably, the above-mentioned second track mechanism drives the diaphragm gripping mechanism 211 to move in a horizontal direction perpendicular to the first direction. The third track mechanism drives the first electrode sheet gripping mechanism 29 to move in the first direction, and the fourth track mechanism drives the first electrode sheet gripping mechanism 29 to move in the first direction. The fifth track mechanism drives the diaphragm cutting mechanism 212 to move in the vertical direction. The sixth track mechanism drives the hot pressing mechanism 213 to move in the vertical direction; the seventh track mechanism drives the discharging mechanism 215 to move in a horizontal direction perpendicular to the first direction.

[0097] By providing a second track mechanism for the diaphragm gripping mechanism 211, a third track mechanism for the first electrode sheet loading mechanism 21, a fourth track mechanism for the second electrode sheet loading mechanism 23, a fifth track mechanism for the diaphragm cutting mechanism 212, a sixth track mechanism for the hot pressing mechanism 213, and a seventh track mechanism for the discharging mechanism 215, the layout of the laminating device is reasonable and the laminating efficiency is relatively high.

[0098] In this embodiment, the stacking mechanism 28 includes a workbench which has a stacking area. On both sides of the stacking area on the workbench, diaphragm pressing components 281 are provided. Each diaphragm pressing component 281 includes a pressing block and a driver, and the driver drives the pressing block to move so as to press or release the first diaphragm 11, the second diaphragm 12 or the third diaphragm 15.

[0099] When stacking the sheets, the stacking can be performed in the order of the first diaphragm 11, the positive electrode sheet 13, the third diaphragm 15, the negative electrode sheet 14 and the second diaphragm 12, or in the order of the second diaphragm 12, the negative electrode sheet 14, the third diaphragm 15, the positive electrode sheet 13 and the first diaphragm 11. By providing the diaphragm pressing components 281, it is ensured that the first diaphragm 11, the second diaphragm 12 and the third diaphragm 15 are positioned on the workbench when being pulled for stacking and will not move due to the pulling during the feeding of the diaphragm roll.

[0100] The working process of the stacking device for the first electrode sheet unit A in the present utility model is introduced below (described from the perspective in Figure 5 ):

[0101] (1) The diaphragm gripping mechanism 211 moves up, down, left and right, grabs the lowermost first diaphragm 11 from the first diaphragm feeding mechanism 25, translates it onto the stacking mechanism 28, the diaphragm pressing component 281 presses the first diaphragm 11 onto the workbench, the diaphragm gripping mechanism 211 releases the first diaphragm 11, and the diaphragm gripping mechanism 211 moves upward to reset.

[0102] (2) The first electrode sheet gripping mechanism 29 moves forward, backward, up and down, grabs the positive electrode sheet 13 from the first electrode sheet feeding mechanism 21, places it on the first position adjusting mechanism 22 to adjust the position, then grabs the positive electrode sheet 13 with the adjusted position from the first position adjusting mechanism 22, places it on the first diaphragm 11 and aligns it in the center with the first diaphragm 11. The first electrode sheet gripping mechanism 29 releases the positive electrode sheet 13, and the first electrode sheet gripping mechanism 29 moves upward to reset.

[0103] (3) The diaphragm gripping mechanism 211 moves up, down, left and right, grabs the middle third diaphragm 15 from the third diaphragm feeding mechanism 27, translates it onto the stacking mechanism 28. After the diaphragm pressing component 281 releases the first diaphragm 11, it presses the third diaphragm 15 onto the workbench. The diaphragm gripping mechanism 211 releases the third diaphragm 15, and the diaphragm gripping mechanism 211 moves upward to reset.

[0104] (4) The second pole piece gripping mechanism 210 moves vertically and horizontally to pick up the negative pole piece 14 from the second pole piece feeding mechanism 23, places it on the second position adjusting mechanism 24 for position adjustment, then picks up the negative pole piece 14 with adjusted position from the second position adjusting mechanism 24, places it on the third separator 15, and aligns it centered with the third separator 15. The second pole piece gripping mechanism 210 releases the negative pole piece 14 and moves upward to reset.

[0105] (5) The separator gripping mechanism 211 moves vertically and horizontally to pick up the topmost second separator 12 from the second separator feeding mechanism 26, translates it to the stacking mechanism 28. After the separator pressing assembly 281 releases the third separator 15, it presses the second separator 12 onto the workbench. The separator gripping mechanism 211 releases the second separator 12 and moves upward to reset.

[0106] (6) The stacking mechanism 28 moves under the separator cutting mechanism 212, and the die-cutting tool of the separator cutting mechanism 212 descends to cut the first separator 11, the third separator 15, and the second separator 12 along the predetermined dimensions, ensuring that the overhang between the separator and the pole piece remains qualified, forming an independent first pole piece unit A.

[0107] (7) The stacking mechanism 28 moves under the hot pressing mechanism 213, and the heating plate of the hot pressing mechanism 213 descends to apply a certain temperature and pressure to the first pole piece unit A for a certain period of time, such as 80 °C, 5T, for 300 s. The parameters can be determined according to the actual hot pressing effect of different models. After the first pole piece unit A is hot pressed, the bonding between the pole piece and the separator of the first pole piece unit A is relatively firm.

[0108] (8) The stacking mechanism 28 moves under the discharging mechanism 215, and the discharging mechanism picks up the first pole piece unit A on the stacking mechanism 28, and the stacking mechanism 28 returns to the stacking station.

[0109] The working process of the stacking device for the second pole piece unit B in the present invention is described below (described from the perspective in Figure 5 ):

[0110] (1) The separator gripping mechanism 211 moves vertically and horizontally to pick up the bottommost first separator 11 from the first separator feeding mechanism 25, translates it to the stacking mechanism 28. The separator pressing assembly 281 presses the first separator 11 onto the workbench. The separator gripping mechanism 211 releases the first separator 11 and moves upward to reset.

[0111] (2) The first pole piece gripping mechanism 29 moves up and down and back and forth, grabs the positive pole piece 13 from the first pole piece feeding mechanism 21, places it on the first position adjusting mechanism 22 to adjust the position, then grabs the positive pole piece 13 with the adjusted position from the first position adjusting mechanism 22, places it on the first separator 11, aligns it in the center with the first separator 11, the first pole piece gripping mechanism 29 releases the positive pole piece 13, and the first pole piece gripping mechanism 29 moves upward to reset;

[0112] (3) The separator gripping mechanism 211 moves up and down, left and right, grabs the intermediate layer third separator 15 from the third separator feeding mechanism 27, translates it to the stacking mechanism 28, and after the separator pressing assembly 281 releases the first separator 11, presses the third separator 15 against the workbench, the separator gripping mechanism 211 releases the third separator 15, and the separator gripping mechanism 211 moves upward to reset;

[0113] (4) The stacking mechanism 28 moves under the separator cutting mechanism 212, and the die-cutting tool of the separator cutting mechanism 212 descends to cut the first separator 11 and the third separator 15 along the established dimensions, and the overhang between the separator and the pole piece remains qualified to form an independent second pole piece unit B;

[0114] (5) The stacking mechanism 28 moves under the hot pressing mechanism 213, and the heating plate of the hot pressing mechanism 213 descends to apply a certain temperature and pressure to the second pole piece unit B for a certain period of time, such as 80 °C, 5T, for 300 s. The parameters can be determined according to the actual hot pressing effect of different models. After the second pole piece unit B is hot pressed, the bonding between the pole piece and the separator of the second pole piece unit B is relatively firm;

[0115] (6) The stacking mechanism 28 moves under the discharging mechanism 215, and the discharging mechanism takes away the second pole piece unit B on the stacking mechanism 28, and the stacking mechanism 28 returns to the stacking station.

[0116] The working process of the stacking device for the third pole piece unit C in the present invention is introduced below (described from the perspective in Figure 5 ):

[0117] (1) The separator gripping mechanism 211 moves up and down, left and right, grabs the intermediate layer third separator 15 from the third separator feeding mechanism 27, translates it to the stacking mechanism 28, and the separator pressing assembly 281 presses the third separator 15 against the workbench, the separator gripping mechanism 211 releases the third separator 15, and the separator gripping mechanism 211 moves upward to reset;

[0118] (2) The second pole piece gripping mechanism 210 moves vertically and horizontally, grabs the negative pole piece 14 from the second pole piece loading mechanism 23, places it on the second position adjustment mechanism 24 for position adjustment, then grabs the negative pole piece 14 with the adjusted position from the second position adjustment mechanism 24, places it on the third separator 15, aligns it centrally with the third separator 15, the second pole piece gripping mechanism 210 releases the negative pole piece 14, and the second pole piece gripping mechanism 210 moves upward to reset;

[0119] (3) The separator gripping mechanism 211 moves vertically and horizontally, grabs the topmost second separator 12 from the second separator loading mechanism 26, translates it to the stacking mechanism 28, the separator pressing component 281 releases the third separator 15 and then presses the second separator 12 against the workbench, the separator gripping mechanism 211 releases the second separator 12, and the separator gripping mechanism 211 moves upward to reset;

[0120] (4) The stacking mechanism 28 moves below the separator cutting mechanism 212, the die-cutting tool of the separator cutting mechanism 212 descends, cuts the third separator 15 and the second separator 12 along the established dimensions, and the overhang between the separator and the pole piece remains qualified, forming an independent third pole piece unit C;

[0121] (5) The stacking mechanism 28 moves below the hot pressing mechanism 213, the heating plate of the hot pressing mechanism 213 descends, applies a certain temperature and pressure to the third pole piece unit C for a certain period of time, such as 80 °C, 5T, for 300 s. The parameters can be determined according to the actual hot pressing effect of different models. After the third pole piece unit C is hot pressed, the bonding between the pole piece and the separator of the third pole piece unit C is relatively firm;

[0122] (6) The stacking mechanism 28 moves below the discharging mechanism 215, the discharging mechanism takes away the third pole piece unit C on the stacking mechanism 28, and the stacking mechanism 28 returns to the stacking station.

[0123] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A battery cell, characterized in that, It includes an intermediate unit, and the intermediate unit includes one or a plurality of first pole piece units (A) stacked in sequence along a set direction; The first pole piece unit (A) includes a first separator (11), a positive electrode plate (13), a third separator (15), a negative electrode plate (14), and a second separator (12) arranged in sequence. The first separator (11), the positive electrode plate (13), the third separator (15), the negative electrode plate (14), and the second separator (12) are connected together by hot pressing. The sum of the thicknesses of the first separator (11) and the second separator (12) is the same as the thickness of the third separator (15).

2. The battery cell according to claim 1, characterized in that, The intermediate unit further includes a second pole piece unit (B) and a third pole piece unit (C); The second pole piece unit (B) includes a first separator (11), a positive electrode plate (13), and a third separator (15). In the second pole piece unit (B), the positive electrode plate (13) is arranged between the first separator (11) and the third separator (15). The first separator (11) of the second pole piece unit (B) is stacked with the outermost second separator (12) among the plurality of first pole piece units (A); The third pole piece unit (C) includes a second separator (12), a negative electrode plate (14), and a third separator (15). In the third pole piece unit (C), the negative electrode plate (14) is arranged between the second separator (12) and the third separator (15). The second separator (12) of the third pole piece unit (C) is stacked with the outermost first separator (11) among the plurality of first pole piece units (A).

3. The cell according to claim 2, characterized in that, The first pole piece unit (A), the second pole piece unit (B), and the third pole piece unit (C) are connected together by hot pressing.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The first separator (11) and the second separator (12) have the same thickness.

5. The battery cell according to any one of claims 1 to 3, characterized in that, Between the head end of the intermediate unit and the head end of the battery cell, and between the tail end of the intermediate unit and the tail end of the battery cell, there are alternately arranged positive electrode plates (13) and negative electrode plates (14) and a third separator (15) arranged between the positive electrode plate (13) and the negative electrode plate (14); wherein, among the two layers of pole pieces closest to the head end and the tail end of the battery cell, both are negative electrode plates (14) or one is a positive electrode plate (13) and the other is a negative electrode plate (14).

6. A lamination device for a pole piece unit, characterized in that, It includes: A first separator feeding mechanism (25) for carrying a first separator coil and unrolling the first separator coil; A second separator feeding mechanism (26) for carrying a second separator coil and unrolling the second separator coil; A third separator feeding mechanism (27) for carrying a third separator coil and unrolling the third separator coil; A first pole piece feeding mechanism (21) for carrying multiple layers of positive electrode plates and releasing the positive electrode plates; A second pole piece feeding mechanism (23) for carrying multiple layers of negative electrode plates and releasing the negative electrode plates; A stacking mechanism (28) for carrying pole piece units; A first pole piece grasping mechanism (29) for transporting the positive electrode plates released by the first pole piece feeding mechanism (21) to the stacking mechanism (28); The second electrode sheet gripping mechanism (210) is used to transport the negative electrode sheet released by the second electrode sheet feeding mechanism (23) to the stacking mechanism (28); The separator gripping mechanism (211) is used to send the first separator released by the first separator feeding mechanism (25), or the second separator released by the second separator feeding mechanism (26), or the third separator released by the third separator feeding mechanism (27) to the stacking mechanism (28); The separator cutting mechanism (212) is used to cut the first separator, second separator, or third separator arranged on the stacking mechanism (28); The hot pressing mechanism (213) is used to hot press the electrode sheet unit produced by the stacking mechanism (28); The discharging mechanism (215) is used to carry the hot pressed electrode sheet unit away.

7. The laminating device according to claim 6, characterized in that, The first electrode sheet feeding mechanism (21) and the second electrode sheet feeding mechanism (23) are respectively arranged on two sides of the stacking mechanism (28) in the first direction. A first position adjusting mechanism (22) for carrying and adjusting the position of the positive electrode sheet is arranged between the first electrode sheet feeding mechanism (21) and the stacking mechanism (28), and a second position adjusting mechanism (24) for carrying and adjusting the position of the negative electrode sheet is arranged between the second electrode sheet feeding mechanism (23) and the stacking mechanism (28).

8. The lamination device according to claim 7, characterized in that, The stacking mechanism (28) is arranged on a first track mechanism, and the first track mechanism is configured to drive the stacking mechanism (28) to move among the stacking station where the stacking mechanism (28) is located, the hot pressing station where the hot pressing mechanism (213) is located, and the discharging station where the discharging mechanism (215) is located.

9. The lamination device according to claim 7, characterized in that, The separator gripping mechanism (211) is arranged on a second track mechanism, and the second track mechanism is configured to drive the separator gripping mechanism (211) to move among the stacking station where the stacking mechanism (28) is located, the first feeding station where the first separator feeding mechanism (25) is located, the second feeding station where the second separator feeding mechanism (26) is located, and the third feeding station where the third separator feeding mechanism (27) is located; The first electrode sheet gripping mechanism (29) is arranged on a third track mechanism, and the third track mechanism is configured to drive the first electrode sheet gripping mechanism (29) to move among the fourth feeding station where the first electrode sheet feeding mechanism (21) is located, the first position adjusting station where the first position adjusting mechanism (22) is located, and the stacking station where the stacking mechanism (28) is located; The second electrode sheet gripping mechanism (210) is arranged on a fourth track mechanism, and the fourth track mechanism is configured to drive the second electrode sheet gripping mechanism (210) to move among the fifth feeding station where the second electrode sheet feeding mechanism (23) is located, the second position adjusting station where the second position adjusting mechanism (24) is located, and the stacking station where the stacking mechanism (28) is located; The diaphragm cutting mechanism (212) is arranged on the fifth track mechanism, and the fifth track mechanism is configured to drive the diaphragm cutting mechanism (212) to perform diaphragm cutting work at the stacking station where the stacking mechanism (28) is located; The hot pressing mechanism (213) is arranged on the sixth track mechanism, and the sixth track mechanism is configured to drive the hot pressing mechanism (213) to perform hot pressing work on the electrode sheet unit carried by the stacking mechanism (28); The discharging mechanism (215) is arranged on the seventh track mechanism, and the seventh track mechanism is configured to drive the discharging mechanism (215) to take the electrode sheet unit carried by the stacking mechanism (28) away.

10. The lamination device according to claim 9, characterized in that, The stacking mechanism (28) includes a workbench, the workbench has a stacking area, and diaphragm pressing assemblies (281) are arranged on both sides of the stacking area on the workbench. The diaphragm pressing assemblies (281) include pressing blocks and drivers, and the drivers drive the pressing blocks to move so that the pressing blocks press or release the first diaphragm or the second diaphragm or the third diaphragm.

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