Laminated battery cell and battery
By using a stacked cell structure and a separator to insulate the positive and negative electrode plates, the high cost problem caused by the complex winding process of lithium batteries is solved, achieving efficient production and simplified processes.
Patent Information
- Application Number
- CN202423267515.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing lithium battery manufacturing processes, the winding process is complex, resulting in high production costs.
The battery adopts a stacked cell structure, with the positive and negative electrodes insulated from each other by a diaphragm. A diaphragm is sandwiched between electrode groups with opposite polarities, which simplifies the process and reduces the hot pressing process.
It reduced production costs, improved production efficiency, avoided short-circuit problems, and simplified the process flow.
Smart Images
Figure CN223771137U_ABST
Abstract
Description
Technical Field
[0001] This utility model generally relates to the field of lithium battery technology, and in particular to a stacked cell and battery. Background Technology
[0002] The winding process is a crucial step in lithium battery manufacturing. In this process, the separator separates the positive and negative electrodes to achieve insulation and prevent short circuits caused by contact between them.
[0003] In the relevant winding process, the negative electrode, the first separator, the positive electrode and the second separator are separate from each other. Therefore, the negative electrode, the first separator, the positive electrode and the second separator need to be wound separately on the winding needle and hot-pressed to obtain the wound cell.
[0004] The complex process involved in the aforementioned wound battery cells results in high production costs. Utility Model Content
[0005] This application aims to provide a stacked battery cell and battery, which at least reduces the complexity of the winding process and lowers the production cost of the battery cell.
[0006] This utility model provides a stacked battery cell, comprising N positive electrode plates, N negative electrode plates and a separator, where N is a positive integer and N≥3.
[0007] Each of the positive electrode plates and each of the negative electrode plates are respectively connected to two opposing surfaces of the separator, and the positive electrode plates and negative electrode plates are arranged correspondingly to form an electrode group;
[0008] The diaphragm is continuously wound around a spool to form a wound cell, and the electrode groups in the wound cell are aligned along a first direction, which is perpendicular to the axis of the spool.
[0009] As an implementation method, along the winding direction of the diaphragm, the spacing between two adjacent electrode groups gradually increases, and the diaphragm is sandwiched between the i-th electrode group and the (i+2)-th electrode group, where i is an even number and N≥i≥2, so that the positive electrode or the negative electrode in the i-th electrode group is in insulating contact with the negative electrode or the positive electrode in the (i+2)-th electrode group, and the two have opposite polarities;
[0010] The diaphragm is sandwiched between the j-th electrode group and the (j+1)-th electrode group, where j is an odd number and N≥j≥1, so that the positive or negative electrode in the j-th electrode group and the negative or positive electrode in the (j+1)-th electrode group are insulated from each other and have opposite polarities.
[0011] As one possible implementation, the i-th electrode group and the j-th electrode group are located on opposite sides of the reel along the first direction.
[0012] As an implementation method, the diaphragm between the even-numbered electrode groups and the odd-numbered electrode groups is cut to form a stacked cell.
[0013] As an implementation method, the stacked battery cell has a first side and a second side disposed opposite to each other, and a third side and a fourth side disposed opposite to each other. The first side and the second side are respectively formed by cutting the wound battery cell, and the third side and the fourth side are respectively the side where the electrode group is located along the first direction. An insulating tape is disposed on the first side and its two ends are respectively bonded to the third side and the fourth side, and another insulating tape is disposed on the second side and its two ends are respectively bonded to the third side and the fourth side.
[0014] As one possible implementation, the positive electrode has a positive tab, and the negative electrode has a negative tab, with the positive and negative tabs located on the same side of the laminated cell and spaced apart. Insulating tape is then placed between the positive and negative tabs, with its two ends respectively adhered to the third and fourth sides.
[0015] As an implementation, the positive electrode has a positive tab, the negative electrode has a negative tab, and the positive tab and the negative tab are located on opposite sides of the stacked cell.
[0016] In one possible implementation, the positive electrode tab is disposed in the middle of the positive electrode sheet, the negative electrode tab is disposed in the middle of the negative electrode sheet, and the positive electrode tab and the negative electrode tab are aligned along the axial direction of the spool.
[0017] Alternatively, the size of the positive electrode may be equal to the size of the negative electrode, or the size of the positive electrode may be smaller than the size of the negative electrode.
[0018] This utility model also provides a battery, including a protective cover and the above-mentioned stacked cells, wherein the protective cover is disposed on the outer periphery of the stacked cells to protect the stacked cells.
[0019] In the above-described scheme, this application uses a separator sandwiched between the i-th electrode group and the i+2-th electrode group to ensure insulated contact between the electrodes in the i-th electrode group and the i+2-th electrode group, thereby preventing short circuits between the electrodes in the i-th electrode group and the i+2-th electrode group; similarly, a separator is sandwiched between the j-th electrode group and the j+1-th electrode group to ensure insulated contact between the electrodes in the j-th electrode group and the j+1-th electrode group, thus preventing short circuits between the electrodes in the j-th electrode group and the j+1-th electrode group. Because only one separator is used, the production cost of the wound cell is reduced, and the process complexity is decreased. The winding method enables rapid stacking and reduces the hot-pressing process, significantly improving the production efficiency of the stacked cell. Attached Figure Description
[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0021] Figure 1 A schematic diagram of a diaphragm in an unfolded state provided for an embodiment of this utility model;
[0022] Figure 2 A schematic diagram of another unfolded state of the diaphragm provided in an embodiment of this utility model;
[0023] Figure 3 A schematic diagram of the manufacturing process of the laminated battery cell provided in this embodiment of the utility model. Figure 1 ;
[0024] Figure 4 A schematic diagram of the manufacturing process of the laminated battery cell provided in this embodiment of the utility model. Figure 2 ;
[0025] Figure 5 A schematic diagram of the manufacturing process of the laminated battery cell provided in this embodiment of the utility model. Figure 3 ;
[0026] Figure 6 A schematic diagram of the manufacturing process of the laminated battery cell provided in this embodiment of the utility model. Figure 4 ;
[0027] Figure 7 A schematic diagram of the manufacturing process of the laminated battery cell provided in this embodiment of the utility model. Figure 5 ;
[0028] 10 diaphragm, 101 barrier portion, 102 surplus portion, 20 positive electrode plate, 21 positive electrode tab, 30 negative electrode plate, 31 negative electrode tab;
[0029] Part 1, 41; Part 2, 42; Insulating tape, 50;
[0030] Electrode group a, first electrode group 1a, second electrode group 2a, third electrode group 3a, fourth electrode group 4a, fifth electrode group 5a, sixth electrode group 6a, seventh electrode group 7a, eighth electrode group 8a, and ninth electrode group 9a. Detailed Implementation
[0031] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.
[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and implementing regulations.
[0033] At least see Figure 1 - Figure 7 As shown, this utility model provides a stacked battery cell, including: N positive electrode plates 20, N negative electrode plates 30 and a separator 10, where N is a positive integer and N≥3.
[0034] Each positive electrode 20 and each negative electrode 30 are respectively connected to two opposite surfaces of the separator 10. The positive electrode 20 and the negative electrode 30 are arranged correspondingly, and the two form electrode group a.
[0035] Specifically, such as Figure 1 As shown, in one example, the positive electrode 20 has a positive tab 21, and the negative electrode 30 has a negative tab 31. The positive electrode 20 is connected to a first surface of the separator 10, and the negative electrode 30 is connected to a second surface of the separator 10, with the second surface facing away from the first surface. The positive electrode 20 and the negative electrode 30 are arranged correspondingly. Here, a positive electrode 20 and its corresponding negative electrode 30 are defined to form electrode group a.
[0036] The positive tab 21 of the positive electrode 20 can be located on the upper side of the separator 10, and the negative tab 31 of the negative electrode 30 can be located on the lower side of the separator 10; alternatively, the positive tab 21 of the positive electrode 20 can be located on the lower side of the separator 10, and the negative tab 31 of the negative electrode 30 can be located on the upper side of the separator 10. That is, the positive tab 21 of the positive electrode 20 and the negative tab 31 of the negative electrode 30 are arranged on the same side. In electrode group a, the positive tab 21 and the negative tab 31 are arranged alternately.
[0037] like Figure 2 As shown, in another example, the positive electrode 20 is connected to the first surface of the separator 10, and the negative electrode 30 is connected to the second surface of the separator 10. The positive electrode 20 and the negative electrode 30 are arranged correspondingly. Here, a positive electrode 20 and its corresponding negative electrode 30 are defined to form electrode group a.
[0038] The positive tab 21 of the positive electrode 20 can be located on the upper side of the separator 10, and the negative tab 31 of the negative electrode 30 can be located on the lower side of the separator 10; alternatively, the positive tab 21 of the positive electrode 20 can be located on the lower side of the separator 10, and the negative tab 31 of the negative electrode 30 can be located on the upper side of the separator 10. That is, the positive tab 21 of the positive electrode 20 and the negative tab 31 of the negative electrode 30 are arranged on opposite sides. Specifically, the positive tab 21 is located in the middle of the positive electrode 20, and the negative tab 31 is located in the middle of the negative electrode 30, and the positive tab 21 and the negative tab 31 are aligned in the vertical direction (that is, in the axial direction of the spool).
[0039] It is understandable that each positive electrode 20 and each negative electrode 30 can be attached to the two sides of the separator 10 by means of adhesive application or tape.
[0040] The following embodiments illustrate this by having the positive tab 21 of the positive electrode 20 and the negative tab 31 of the negative electrode 30 arranged on the same side:
[0041] like Figure 3 As shown, the winding device is used to wind the diaphragm 10 to form a wound battery cell, as... Figure 4 As shown, the wound battery cell is spiral-shaped. The winding device is elliptical and includes a first part 41 and a second part 42. One end of the diaphragm 10 is sandwiched between the first part 41 and the second part 42, and with this end as the winding shaft, the diaphragm is continuously wound around the winding shaft to form a spiral shape. Since the distance between two adjacent electrode groups a gradually increases along the winding direction of the diaphragm 10, in the wound battery cell, the first electrode group 1a, the second electrode group 2a, the third electrode group 3a, ..., the (N-1)th electrode group a, and the Nth electrode group a are all aligned along a first direction, where N is a positive integer. The first direction is perpendicular to the axis of the winding shaft. Figure 4 As shown, each group of plates a is arranged in alignment along the front-to-back direction, with the first direction being the front-to-back direction. The position of plate group a corresponds to the middle position of the major axis of the ellipse.
[0042] A diaphragm 10 is sandwiched between the i-th electrode group a and the (i+2)-th electrode group a, where i is an even number and N≥i≥2, to ensure that the positive electrode 20 or negative electrode 30 in the i-th electrode group a is insulated from the negative electrode 30 or positive electrode 20 in the (i+2)-th electrode group a, and that their polarities are opposite. A diaphragm 10 is sandwiched between the j-th electrode group a and the (j+1)-th electrode group a, where j is an odd number and N≥j≥1, to ensure that the positive electrode 20 or negative electrode 30 in the j-th electrode group a is insulated from the negative electrode 30 or positive electrode 20 in the (j+1)-th electrode group a, and that their polarities are opposite.
[0043] The i-th electrode group a and the j-th electrode group a are located on both sides of the roll along the first direction.
[0044] like Figure 4As shown, even-numbered electrode groups a are located on one side of the winding device, and odd-numbered electrode groups a are located on the other side of the winding device. The second electrode group 2a, the fourth electrode group 4a, the sixth electrode group 6a, the eighth electrode group 8a, etc. are located on the upper side of the winding device, and the first electrode group 1a, the third electrode group 3a, the fifth electrode group 5a, the seventh electrode group 7a, the ninth electrode group 9a, etc. are located on the lower side of the winding device.
[0045] The spacing between two adjacent electrode groups a gradually increases, meaning the length of the diaphragm 10 between them gradually increases. This increased spacing allows the diaphragm 10 to cover the electrode group a wound around the previous layer, thus insulating the two adjacent electrode groups a. Specifically, a diaphragm 10 is provided between the second electrode group 2a and the fourth electrode group 4a (e.g., ...). Figure 4 (As shown by the red line in the middle), so that the positive electrode 20 in the second electrode group 2a and the negative electrode 30 in the fourth electrode group 4a are in insulating contact, or, the negative electrode 30 in the second electrode group 2a and the positive electrode 20 in the fourth electrode group 4a are in insulating contact; a diaphragm 10 is provided between the fourth electrode group 4a and the sixth electrode group 6a (e.g., Figure 4 (As shown by the blue line in the middle), so that the positive electrode 20 in the fourth electrode group 4a is in insulating contact with the negative electrode 30 in the sixth electrode group 6a, or, the negative electrode 30 in the fourth electrode group 4a is in insulating contact with the positive electrode 20 in the sixth electrode group 6a. A diaphragm 10 is provided between the sixth electrode group 6a and the eighth electrode group 8a (e.g., Figure 4 (As shown by the yellow line in the middle), in this way, the positive electrode 20 in the sixth electrode group 6a is in insulating contact with the negative electrode 30 in the eighth electrode group 8a, or the negative electrode 30 in the sixth electrode group 6a is in insulating contact with the positive electrode 20 in the eighth electrode group 8a.
[0046] A diaphragm 10 is provided between the first electrode group 1a and the third electrode group 3a (e.g. Figure 4 (As shown by the red line in the middle), so that the positive electrode 20 in the first electrode group 1a and the negative electrode 30 in the third electrode group 3a are in insulating contact, or, the negative electrode 30 in the first electrode group 1a and the positive electrode 20 in the third electrode group 3a are in insulating contact; a diaphragm 10 is provided between the third electrode group 3a and the fifth electrode group 5a (e.g., Figure 4 (As shown by the blue line in the middle), so that the positive electrode 20 in the third electrode group 3a is in insulating contact with the negative electrode 30 in the fifth electrode group 5a, or, the negative electrode 30 in the third electrode group 3a is in insulating contact with the positive electrode 20 in the fifth electrode group 5a. A diaphragm 10 is provided between the fifth electrode group 5a and the seventh electrode group 7a (e.g., Figure 4 (As shown by the yellow line in the middle), in this way, the positive electrode 20 in the fifth electrode group 5a and the negative electrode 30 in the seventh electrode group 7a are in insulating contact, or the negative electrode 30 in the fifth electrode group 5a and the positive electrode 20 in the seventh electrode group 7a are in insulating contact.
[0047] This configuration, with a diaphragm 10 sandwiched between the i-th electrode group a and the i+2-th electrode group a, ensures that the electrodes in the i-th electrode group a and the i+2-th electrode group a are insulated from each other, thus preventing short circuits between the electrodes in the i-th electrode group a and the i+2-th electrode group a. Similarly, a diaphragm 10 sandwiched between the j-th electrode group a and the j+1-th electrode group a ensures that the electrodes in the j-th electrode group a and the j+1-th electrode group a are insulated from each other, thus preventing short circuits between the electrodes in the j-th electrode group a and the j+1-th electrode group a. Because only one diaphragm 10 is used, the production cost of the wound battery cell is reduced, its process complexity is reduced, and the production efficiency of the wound battery cell is improved.
[0048] It should be noted that, as Figure 1 or Figure 2 As shown, along the direction from the starting end to the ending end of winding, the length of the negative electrode 30 is greater than the length of the positive electrode 20. That is, during winding, the negative electrode 30 is wound before the positive electrode 20, and the positive electrode 20 stops winding before the negative electrode 30. Of course, it is understood that in some embodiments, the lengths of the negative electrode 30 and the positive electrode 20 may be equal.
[0049] The above-mentioned wound battery cell is hot-pressed and a portion of the separator 10 between the even-numbered electrode group a and the odd-numbered electrode group a is removed to obtain a laminated battery cell.
[0050] like Figure 5 and Figure 6 As shown, the excess portion 102 of the spacer 10 between the first electrode group a and the second electrode group a is cut off, and a barrier portion 101 of the spacer 10 is sandwiched between the first electrode group a and the second electrode group a; the excess portion 102 of the spacer 10 between the third electrode group a and the fourth electrode group a is cut off, and a barrier portion 101 of the spacer 10 is sandwiched between the third electrode group a and the fourth electrode group a; the excess portion 102 of the spacer 10 between the fifth electrode group a and the sixth electrode group a is cut off, and a barrier portion 101 of the spacer 10 is sandwiched between the fifth electrode group a and the sixth electrode group a; the excess portion 102 of the spacer 10 between the seventh electrode group a and the eighth electrode group a is cut off, and a barrier portion 101 of the spacer 10 is sandwiched between the seventh electrode group a and the eighth electrode group a, etc., can form a stacked battery cell, which is square.
[0051] Cutting off excess separator 10 helps reduce the volume of the cell, which in turn facilitates the rapid placement of the stacked cells into the battery case in subsequent processes.
[0052] The laminated cell has a first side and a second side arranged opposite to each other, and a third side and a fourth side arranged opposite to each other. The first side and the second side are formed by cutting the wound cell, and the third side and the fourth side are the sides where the electrode group a is located along the first direction.
[0053] like Figure 7 As shown, an insulating tape 50 is disposed on the first side, with its two ends respectively bonded to the third and fourth sides. Another insulating tape 50 is disposed on the second side, with its two ends respectively bonded to the third and fourth sides. Yet another insulating tape 50 is disposed between the positive electrode tab 21 and the negative electrode tab 31, with its two ends respectively bonded to the third and fourth sides. This prevents the separator 10 from losing tension and shrinking after cutting, thus avoiding contact between the positive and negative electrode sheets. Simultaneously, it allows for quick and easy connection of adjacent electrode groups, improving the production efficiency of the laminated cell.
[0054] In summary, this application employs a separator 10 sandwiched between the i-th electrode group a and the (i+2)-th electrode group a to ensure insulated contact between the electrodes in the i-th electrode group a and the (i+2)-th electrode group a, thereby preventing short circuits between the electrodes in the i-th electrode group a and the (i+2)-th electrode group a. Similarly, a separator 10 sandwiched between the j-th electrode group a and the (j+1)-th electrode group a ensures insulated contact between the electrodes in the j-th electrode group a and the (j+1)-th electrode group a, again preventing short circuits between the electrodes in the j-th electrode group a and the (j+1)-th electrode group a. Because only one separator 10 is used, the production cost of the wound cell is reduced, and the process complexity is decreased. The winding method enables rapid stacking and reduces the hot-pressing process, significantly improving the production efficiency of the stacked cell.
[0055] This utility model also provides a battery, which includes a protective cover and the aforementioned stacked battery cells. The protective cover is disposed on the outer periphery of the stacked battery cells and is used to protect the stacked battery cells. The battery has the advantages of stacked battery cells, so they will not be described in detail here.
[0056] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0057] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.
Claims
1. A jelly-roll cell, characterized by, Comprise: N positive electrode sheets (20) and N negative electrode sheets (30), N is a positive integer, N≥3, A diaphragm (10), each of the positive electrode sheets (20) and each of the negative electrode sheets (30) are connected to the two surfaces of the diaphragm (10) arranged opposite, the positive electrode sheet (20) and the negative electrode sheet (30) are arranged correspondingly, and the two form an electrode sheet group (a); The diaphragm (10) is continuously wound around a winding shaft to form a wound battery cell, and the electrode sheet group (a) is arranged in a first direction in the wound battery cell, and the first direction is perpendicular to the axis of the winding shaft.
2. The laminated battery cell according to claim 1, wherein, Along the winding direction of the diaphragm (10), the distance between the adjacent two electrode sheet groups (a) gradually increases, the i-th electrode sheet group (a) and the i+2-th electrode sheet group (a) are clamped with the diaphragm (10), i is an even number, N≥i≥2, so that the positive electrode sheet (20) or the negative electrode sheet (30) in the i-th electrode sheet group (a) is in insulating contact with the negative electrode sheet (30) or the positive electrode sheet (20) in the i+2-th electrode sheet group (a), and the polarity of the two is opposite; The j-th electrode sheet group (a) and the j+1-th electrode sheet group (a) are clamped with the diaphragm (10), j is an odd number, N≥j≥1, so that the positive electrode sheet (20) or the negative electrode sheet (30) in the j-th electrode sheet group (a) is in insulating contact with the negative electrode sheet (30) or the positive electrode sheet (20) in the j+1-th electrode sheet group (a), and the polarity of the two is opposite.
3. The jellyroll of claim 2, wherein, The i-th electrode sheet group (a) and the j-th electrode sheet group (a) are respectively located on both sides of the winding shaft along the first direction.
4. The jellyroll of claim 1, wherein, Part of the diaphragm (10) between the even number electrode sheet group (a) and the odd number electrode sheet group (a) is cut to form a laminated battery cell.
5. The jellyroll of claim 4, wherein, The laminated battery cell has a first side and a second side arranged opposite and a third side and a fourth side arranged opposite, the first side and the second side are respectively formed by cutting the wound battery cell, and the third side and the fourth side are respectively the side on which the electrode sheet group (a) is located along the first direction; An insulating tape (50) is arranged on the first side, and the two ends thereof are respectively adhered to the third side and the fourth side, and another insulating tape (50) is arranged on the second side, and the two ends thereof are respectively adhered to the third side and the fourth side.
6. The jellyroll of claim 5, wherein, The positive electrode sheet (20) has a positive electrode lug (21), and the negative electrode sheet (30) has a negative electrode lug (31), the positive electrode lug (21) and the negative electrode lug (31) are located on the same side of the laminated battery cell and are arranged at intervals, and the insulating tape (50) is arranged between the positive electrode lug (21) and the negative electrode lug (31), and the two ends thereof are respectively adhered to the third side and the fourth side.
7. The stacked cell of claim 5, wherein, The positive electrode sheet (20) has a positive electrode lug (21), and the negative electrode sheet (30) has a negative electrode lug (31), the positive electrode lug (21) and the negative electrode lug (31) are located on opposite sides of the laminated battery cell.
8. The stacked cell of claim 7, wherein, The positive tab (21) is arranged at the middle of the positive plate (20), the negative tab (31) is arranged at the middle of the negative plate (30), and the positive tab (21) and the negative tab (31) are arranged in alignment along the axis direction of the winding shaft.
9. The jellyroll of any one of claims 1-8, wherein, The size of the positive plate (20) is equal to or smaller than the size of the negative plate (30).
10. A battery, characterized by The protection cover is arranged at the outer periphery of the laminated battery cell for protecting the laminated battery cell.