Cells and Batteries

Abstract

The present application provides a cell and battery. The cell includes a first stacked cell and a second stacked cell, each of which includes a plurality of first and second plates stacked alternately, and the projection of the first stacked cell is within the projection of the second stacked cell in a plane parallel to the first plate. By stacking the first and second stacked cells of different sizes, the cell can be flexibly adapted to battery chamber structures of different sizes, and the manufacturing process is simple and easy for mass production.

Description

[Technical Field]

[0001] TECHNICAL FIELD This application relates to the field of battery technology, and in particular to cells and batteries. [Background technology]

[0002] With the development of the economy and the progress of science and technology, smart products have been integrated into every aspect of people's lives. To improve user experience, smart products are evolving towards lighter and smaller sizes. Lithium-ion button batteries, which can be cycled and used repeatedly, are applied in various areas of people's daily lives, such as wearable products, computer products, and medical products.

[0003] Since different terminal products require different battery compartment structures, how to mass-produce lithium batteries is an important issue. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to solve the above technical problems, the present application provides a cell and a battery. [Means for solving the problem]

[0005] According to a first aspect, one embodiment of the present application provides a cell, the cell including a first stacked cell and a second stacked cell arranged in a stacked manner, the first stacked cell and the second stacked cell each including a plurality of first plates and second plates alternately stacked, and a projection of the first stacked cell is located within a range of a projection of the second stacked cell in a plane parallel to the plurality of first plates.

[0006] Based on the first aspect, in some embodiments of the first aspect, both the first stacked cell and the second stacked cell include a plurality of first tabs and a plurality of second tabs, and in a plane parallel to the plurality of first plates, projections of the plurality of first tabs included in the first stacked cell and projections of the plurality of first tabs included in the second stacked cell have an overlapping region, and / or in a plane parallel to the plurality of first plates, projections of the plurality of second tabs included in the first stacked cell and projections of the plurality of second tabs included in the second stacked cell have an overlapping region.

[0007] Based on the first aspect, in some embodiments of the first aspect, the cell further includes a case encasing the first stacked cell and the second stacked cell.

[0008] Based on the first aspect, in some embodiments of the first aspect, each second plate includes a second current collector and a second polarity active layer coated on a surface of the second current collector, the second current collector of the second plate closer to the first cell of the second stack includes a first portion facing the first plate closer to the second cell of the first stack and a second portion connecting to the first portion, the second polarity active layer includes a portion formed on the first portion, and a protective layer is provided on a surface of the second portion closer to the first cell.

[0009] Based on the first aspect, in some embodiments of the first aspect, the protective layer includes a blue adhesive and / or a green adhesive.

[0010] Based on the first aspect, in some embodiments of the first aspect, the second polar active layer further comprises a portion located between the second portion and the protective layer.

[0011] Based on the first aspect, in some embodiments of the first aspect, each first plate includes a first current collector and a first polar active layer coated on a surface of the first current collector, and the first current collector of the first plate closer to the second stacked cell of the first stacked cell is positioned to face the first current collector of the first plate closer to the first stacked cell of the second stacked cell.

[0012] Based on the first aspect, in some embodiments of the first aspect, a first current collector of a first plate near the second stacked cell of the first stacked cell and a first current collector of a first plate near the first stacked cell of the second stacked cell are bonded together by any one of a hot melt adhesive, a polypropylene adhesive, and a double-sided tape.

[0013] Based on the first aspect, in some embodiments of the first aspect, each first electrode plate includes a first current collector and a first polarity active layer applied to a surface of the first current collector, and each second electrode plate includes a second current collector and a second polarity active layer applied to a surface of the second current collector, and the first polarity active layer of the first electrode plate closer to the second stacked cell of the first stacked cell is positioned to face the second polarity active layer of the second electrode plate closer to the first stacked cell of the second stacked cell.

[0014] Based on the first aspect, in some embodiments of the first aspect, the cell further includes a fifth separator bonded to a first electrode plate of the first stacked cell that is closer to the second stacked cell, and the fifth separator is integrally bonded to a second polar active layer of the second stacked cell that is closer to the first stacked cell.

[0015] Based on the first aspect, in some embodiments of the first aspect, a first electrode plate of the first stacked cell facing the second stacked cell includes a first current collector and a first polar active layer applied to a surface of the first current collector closer to the second stacked cell.

[0016] Based on the first aspect, in some embodiments of the first aspect, the cell further includes a first separator adhered to a first polar active layer applied to a surface of the first current collector closer to the second stacked cell.

[0017] Based on the first aspect, in some embodiments of the first aspect, a first electrode plate of the second stacked cell facing the first stacked cell includes a first current collector and a first polar active layer applied to a surface of the first current collector closer to the first stacked cell.

[0018] Based on the first aspect, in some embodiments of the first aspect, the cell further includes a second separator adhered to a first polar active layer applied to a surface of the first current collector closer to the first stacked cell.

[0019] Based on the first aspect, in some embodiments of the first aspect, in a plane parallel to the plurality of first plates, a projection of at least one side of the first stacked cell overlaps with a projection of at least one side of the second stacked cell.

[0020] Based on the first aspect, in some embodiments of the first aspect, the first stacked cell and the second stacked cell both include a plurality of first tabs and a plurality of second tabs, each of the first plates includes a first current collector, and the first current collector has an insulating layer disposed in a region of one end thereof close to the corresponding first tab.

[0021] Based on the first aspect, in some embodiments of the first aspect, the cell further includes a plurality of composite units, each composite unit including a third separator, a first electrode plate, a fourth separator, and a second electrode plate stacked in sequence.

[0022] According to the first aspect, in some embodiments of the first aspect, the portion of the third separator extending beyond the first plate is bonded to the portion of the fourth separator extending beyond the first plate.

[0023] In some embodiments of the first aspect, the first plate is a positive plate and the second plate is a negative plate.

[0024] According to a second aspect, one embodiment of the present application provides a battery, the battery comprising the cell according to any one of the above embodiments and a case containing the cell.

[0025] Based on the second aspect, in some embodiments of the second aspect, a first electrode plate of the first stacked cell that faces away from the second stacked cell includes a first current collector, and the first current collector is arranged to face the case, and / or a first electrode plate of the second stacked cell that faces away from the first stacked cell includes a first current collector, and the first current collector is arranged to face the case. [Effects of the Invention]

[0026] The present application provides a cell, which includes first and second stacked cells, each including a plurality of first and second plates stacked alternately, with the projection of the first stacked cell within the projection of the second stacked cell in a plane parallel to the first plates. The present application stacks the first and second stacked cells of different sizes so that the projection of the first stacked cell in the plane is within the projection of the second stacked cell, thereby enabling flexible adaptation to battery chamber structures of different sizes, simplifying the manufacturing process, and facilitating mass production. [Brief explanation of the drawings]

[0027] The above and other objects, features and advantages of the present application will be more clearly understood by referring to the drawings, which are included to provide a better understanding of the present application, constitute a part of this specification, and are used to explain the present application together with the embodiments of the present application, and are not intended to be limiting of the present application. In the drawings, the same reference numerals generally indicate the same components or steps. [Figure 1] 1A is a structural schematic diagram of a cell according to one exemplary embodiment of the present application, and FIG. 1B is a structural schematic diagram of the cell shown in FIG. 1A in the N direction. [Figure 2]FIG. 2 is a structural schematic diagram of a cell according to another exemplary embodiment of the present application. [Figure 3] FIG. 2 is a structural schematic diagram of a first electrode plate facing a second stacked cell of a first stacked cell according to an exemplary embodiment of the present application; [Figure 4] FIG. 2 is a structural schematic diagram of a first electrode plate facing back to a first stacked cell of a second stacked cell according to one exemplary embodiment of the present application. [Figure 5] FIG. 2 is a structural schematic diagram of a cell according to another exemplary embodiment of the present application. [Figure 6] FIG. 2 is a structural schematic diagram of a cell according to another exemplary embodiment of the present application. [Figure 7] FIG. 2 is a structural schematic diagram of an insulating layer according to one exemplary embodiment of the present application. [Figure 8] FIG. 1 is a structural schematic diagram of a composite unit according to an exemplary embodiment of the present application. [Figure 9] 1 is a structural schematic diagram of a battery according to one exemplary embodiment of the present application; [Figure 10] 1A is a structural schematic diagram of a cell according to one exemplary embodiment of the present application; 1B is a structural schematic diagram of the cell shown in 1A in the N direction; 1C is a structural schematic diagram of a cell according to another exemplary embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Needless to say, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0029] Furthermore, in order to better explain the present application, a large amount of specific details are set forth in the following specific embodiments. However, it should be understood that those skilled in the art can still practice the present application without some specific details. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail in order to assert the present application.

[0030] Hereinafter, cells according to some embodiments of the present application will be described with reference to FIGS.

[0031] 1(a) is a structural schematic diagram of a cell according to one exemplary embodiment of the present application. FIG. 1(b) is a structural schematic diagram of the cell shown in FIG. 1(a) in the N direction. As shown in FIGS. 1(a) and 1(b), a cell 100 according to an embodiment of the present application includes a first stacked cell 110 and a second stacked cell 120, each of which includes a plurality of first electrode plates A100 and second electrode plates B100 that are alternately stacked. In a plane parallel to the first electrode plate A100, the projection of the first stacked cell 110 is located within the range of the projection of the second stacked cell 120. The first stacked cell 110 and the second stacked cell 120 each include a plurality of first tabs A and a plurality of second tabs B, and the plurality of first tabs A of the first stacked cell 110 and the plurality of first tabs A of the second stacked cell 120 have an overlapping area when projected on a plane parallel to the first electrode plate A100, and the plurality of second tabs B of the first stacked cell 110 and the plurality of second tabs B of the second stacked cell 120 also have an overlapping area when projected on a plane parallel to the first electrode plate A100. The planar shapes of the first stacked cell 110, the second stacked cell 120, the first tabs A, and the second tabs B may be rectangular.

[0032] In some embodiments, the first plate A100 is a positive plate and the second plate B100 is a negative plate. The first tab A represents a positive tab and the second tab B represents a negative tab. The positive tab corresponds to the positive tab and the negative tab corresponds to the negative tab.

[0033] In some embodiments, in a plane parallel to the first electrode plate A100, the projection of the first stacked cell 110 is located within the projection of the second stacked cell 120, i.e., the first stacked cell 110 and the second stacked cell 120 are different sizes. This allows for flexible adaptation to battery compartment structures of different sizes. Furthermore, the first stacked cell 110 and the second stacked cell 120 can be designed with different shapes according to different needs, thus enabling flexible adaptation to battery compartment structures of different shapes, which is advantageous for the development of smart products toward lighter weight and smaller size. Furthermore, the manufacturing process is simple, making mass production easy.

[0034] In some embodiments, the difference between the thickness h1 of the first stacked cell 110 and the thickness h2 of the second stacked cell 120 is 0.3 mm or more, the difference in length a between the first stacked cell 110 and the second stacked cell 120 is 0 mm or more, and the difference in width b between the first stacked cell 110 and the second stacked cell 120 is 0 mm or more, but the difference in length a and the difference in width b cannot be 0 mm at the same time.

[0035] 2 is a structural schematic diagram of a cell according to another exemplary embodiment of the present application. As shown in FIG. 2, in the cell 100 according to the embodiment of the present application, the first electrode plate A100 includes a first current collector A110 and a first polar active layer A120 coated on the surface of the first current collector A110, and the first current collector A110 of the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 is disposed opposite to the first current collector A110 of the first electrode plate A100 closest to the first stacked cell 110 of the second stacked cell 120.

[0036] In some embodiments, facing (or facing opposite) means that the first current collector A110 of the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 and the first current collector A110 of the first electrode plate A100 closest to the first stacked cell 110 of the second stacked cell 120 are installed adjacent to each other.

[0037] In some embodiments, the first current collector A110 may be an aluminum foil, and the thickness of the first current collector A110 is 10 μm or more.

[0038] For battery cases of the same volume, the more positive plates the cell 100 contains, the higher the charge capacity. Therefore, for battery cases of the same volume, when the first current collector A110 of the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 is placed opposite the first current collector A110 of the first electrode plate A100 closest to the first stacked cell 110 of the second stacked cell 120, the charge capacity of the battery cell 100 is high. Therefore, the first stacked cell 110 and the second stacked cell 120 according to the embodiments of the present application improve the charge capacity of the cell 100.

[0039] In the cell 100 according to the embodiment of the present application, the first current collector A110 of the first stacked cell 110 that is close to the second stacked cell 120 and the first current collector A110 of the second stacked cell 120 that is close to the first stacked cell 110 are bonded together using any one of hot melt adhesive, polypropylene adhesive, and double-sided tape, which simplifies the manufacturing process and reduces costs.

[0040] 3 is a structural schematic diagram of a first electrode plate facing the second stacked cell of the first stacked cell according to one exemplary embodiment of the present application. As shown in FIG. 3, the first electrode plate A100 facing the second stacked cell 120 of the first stacked cell 110 includes a first current collector A110 and a first polar active layer A120 coated on the surface of the first current collector A110 closer to the second stacked cell 120.

[0041] The first electrode plate A100 of the first stacked cell 110 facing the second stacked cell 120 refers to the first electrode plate of the first stacked cell 110 that is farthest from the second stacked cell 120, that is, the first electrode plate that is located at the top.

[0042] Specifically, the first polarity active layer A120 is a positive electrode active layer, and includes ternary lithium, lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, etc., and the thickness of the first polarity active layer A120 is 30 μm or more.

[0043] As shown in FIG. 3, the cell 100 according to the embodiment of the present application further includes a first separator 130 bonded to the first polar active layer A120 of the first electrode plate A100 facing the second stacked cell 120 of the first stacked cell 110.

[0044] Specifically, the first polarity active layer A120 and the first separator 130 are bonded together by a hot pressing process.

[0045] In the non-charged / discharged state, the role of the separator is to prevent short circuits, and in the charged / discharged state, charged ions (e.g., lithium ions) migrate through the pores of the separator. For example, in the charged state, lithium ions migrate from the positive electrode to the negative electrode, and in the discharged state, lithium ions migrate from the negative electrode to the positive electrode.

[0046] 4 shows a structural schematic diagram of a first electrode plate facing the first stacked cell of a second stacked cell according to an exemplary embodiment of the present application. As shown in FIG. 4, in a cell 100 according to the embodiment of the present application, the first electrode plate A100 facing the first stacked cell 110 of the second stacked cell 120 includes a first current collector A110 and a first polar active layer A120 coated on the surface of the first current collector A110 closer to the first stacked cell 110.

[0047] The first electrode plate A100 of the second stacked cell 120 facing away from the first stacked cell 110 refers to the first electrode plate of the second stacked cell 120 that is farthest from the first stacked cell 110, that is, the lowermost first electrode plate.

[0048] The cell 100 according to the embodiment of the present application further includes a second separator 140 bonded to the first polarity active layer A120 of the first electrode plate A100 facing the first stacked cell 110 of the second stacked cell 120.

[0049] According to the principle mentioned in the embodiment shown in FIG. 2, the first stacked cell 110 and the second stacked cell 120 according to the embodiments shown in FIGS. 3 and 4 further improve the charge capacity of the cell 100. In the embodiment shown in FIG.

[0050] The first separator 130 and the second separator 140 have the same structure but are located at different positions. The separator and the active layer referred to in this application are bonded together by a hot pressing process.

[0051] In some embodiments, first separator 130 and second separator 140 both comprise adhesive-coated or ceramic-coated separators, and the separator thickness is 5 μm or greater.

[0052] 5 shows a schematic diagram of a cell structure according to another exemplary embodiment of the present application. As shown in FIG. 5, in a plane parallel to the first electrode plate A100, the projection of at least one side of the first stacked cell 110 overlaps the projection of at least one side of the second stacked cell 120, thereby ensuring that the boundaries between the first stacked cell 110 and the second stacked cell 120 are aligned and preventing the first stacked cell 110 and the second stacked cell 120 from shaking, thereby avoiding case rupture caused by misalignment between the first stacked cell 110 and the second stacked cell 120.

[0053] 6 shows a schematic diagram of a cell structure according to another exemplary embodiment of the present application. As shown in FIG. 6, the embodiment of the present application shows three other planar patterns of the first stacked cell 110 and the second stacked cell 120 (i.e., the projected shapes of the first stacked cell 110 and the second stacked cell 120 on a plane parallel to the first electrode plate A100). The embodiment of the present application does not further limit the projected shapes of the first stacked cell 110 and the second stacked cell 120 on a plane parallel to the first electrode plate A100, as long as it can flexibly adapt to battery chamber structures of different shapes.

[0054] 7 shows a structural schematic diagram of an insulating layer according to one exemplary embodiment of the present application. As shown in FIG. 7, a first electrode plate A100 includes a first current collector A110, and the surface of the first current collector A110 includes an uncoated area W near one end of a first tab A, and an insulating layer is provided in the uncoated area W.

[0055] Because the plates are formed by slicing, burrs are likely to form on the cut surfaces around the positive and negative plates, especially on the positive electrode tab of the positive plate. If the burrs penetrate the separator and connect to the negative plate, they can cause serious short-circuit failure problems. In view of this, an insulating layer is provided on the uncoated area W of the first current collector A110. The insulating layer has a width of 3 mm or more, a length equal to the length of the first current collector A110, and a thickness of 10 μm or more. The insulating layer may be made of an insulating material such as ceramic, to prevent short circuits.

[0056] FIG. 8 shows a structural schematic diagram of a composite unit according to one exemplary embodiment of the present application. As shown in FIG. 8, a cell 100 according to this embodiment of the present application further includes a plurality of composite units 150, each of which includes a third separator 151, a first electrode plate A100, a fourth separator 152, and a second electrode plate B100, which are sequentially stacked and bonded to one another. In some embodiments, the portion of the third separator 151 extending beyond the first electrode plate A100 is bonded to the portion of the fourth separator 152 extending beyond the first electrode plate A100. The third separator 151 and the fourth separator 152 enclose the first electrode plate A100, thereby preventing direct contact between the first electrode plate A100 and the second electrode plate B100 and preventing a short circuit between the first electrode plate A100 and the second electrode plate B100 in a non-charge / discharge state.

[0057] In some embodiments, the second electrode plate B100 includes a second current collector and a second polarity active layer coated on the surface of the second current collector. The second current collector B110 may be a copper foil, and the thickness of the second current collector B110 may be 1 μm or more. The second polarity active layer B120 is a negative electrode active layer, and may include graphite or the like, and the thickness of the second polarity active layer B120 may be 20 μm or more.

[0058] Hereinafter, cells according to some other embodiments of the present application will be described with reference to FIGS. 3 to 8 and 10(a) to (c).

[0059] 10(a) shows a structural schematic diagram of a cell according to one exemplary embodiment of the present application. FIG. 10(b) shows a structural schematic diagram of the cell shown in FIG. 10(a) in the N direction. FIG. 10(c) shows a structural schematic diagram of a cell according to another exemplary embodiment of the present application. As shown in FIGS. 10(a), (b), and (c), a cell 100′ according to an embodiment of the present application includes a first stacked cell 110 and a second stacked cell 120, which are stacked together, and a case 200 that covers the first stacked cell 110 and the second stacked cell 120. The first stacked cell 110 and the second stacked cell 120 each include a plurality of first electrode plates A100 and second electrode plates B100 that are stacked alternately. In a plane parallel to the first electrode plate A100, the projection of the first stacked cell 110 is located within the projection of the second stacked cell 120. The second electrode plate B100, which is closer to the first cell stack 110 of the second cell stack 120, includes a second current collector B110 and a second polarity active layer B120 coated on the surface of the second current collector B110. The second current collector B110 includes a first portion B111 facing the first electrode plate A100, which is closer to the second cell stack 120 of the first cell stack 110, and a second portion B112 connected to the first portion B111. The second polarity active layer B120 is coated on the surface of the first portion B111. A protective layer is provided on the surface of the second portion B112, which is closer to the first cell stack 110.

[0060] In some embodiments, as shown in (a) and (b) of Figures 10, the difference between the thickness h1 of the first stacked cell 110 and the thickness h2 of the second stacked cell 120 is 0.3 mm or more, the difference in length a between the first stacked cell 110 and the second stacked cell 120 is 0 mm or more, and the difference in width b between the first stacked cell 110 and the second stacked cell 120 is 0 mm or more, but the difference in length a and the difference in width b cannot be 0 mm at the same time.

[0061] The second polarity active layer B120 coated on the surface of the first portion B111 and the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 are disposed adjacent to each other, allowing charges to transfer between the first stacked cell 110 and the second stacked cell 120 to form a current. A protective layer is disposed on the surface of the second portion B112 closest to the first stacked cell 110, thereby preventing a short circuit due to the electrical connection between the second portion B112 and the case 200. Specifically, the first portion B111 is the overlapping portion of the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 and the second polarity active layer B120, and the second portion B112 is the non-overlapping portion of the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 and the second polarity active layer B120. A protective layer is provided on the surface of the unoverlapped portion close to the first stacked cell 110.

[0062] The battery cell 100' according to the present application can be flexibly adapted to different sized battery chamber structures because the first stacked cell 110 and the second stacked cell 120 have different sizes, and the manufacturing process is simple and mass production is easy. Furthermore, the protective layer provided on the second part B112 prevents a short circuit between the second part B112 and the case 200. In other words, a protective layer is provided on the non-overlapping area of ​​the first stacked cell 110 and the second stacked cell 120, thereby preventing a short circuit between the second electrode plate B100 of the second stacked cell 120, which is close to the first stacked cell 110, and the case 200.

[0063] The present application provides a battery cell 100′, which includes a first stacked cell 110 and a second stacked cell 120, and a case 200 that covers the first stacked cell 110 and the second stacked cell 120. The first stacked cell 110 and the second stacked cell 120 each include a plurality of first electrodes A100 and second electrodes B100 that are alternately stacked. In a plane parallel to the first electrode plate A100, the projection of the first stacked cell 110 is within the projection of the second stacked cell 120. That is, the first stacked cell 110 and the second stacked cell 120 have different sizes, which can flexibly adapt to battery chamber structures of different sizes. The manufacturing process is simple and easy for mass production. The second electrode plate B100 of the second stacked cell 120, which is closer to the first stacked cell 110, includes a second current collector B110 and a second polarity active layer B120 coated on the surface of the second current collector B110. The second current collector B110 includes a first portion B111 facing the first electrode plate A100 of the first stacked cell 110, which is closer to the second stacked cell 120, and a second portion B112 connected to the first portion B111. The second polarity active layer B120 is coated on the surface of the first portion B111. A protective layer is provided on the surface of the second portion B112, which is closer to the first stacked cell 110, to prevent a short circuit due to an electrical connection between the second portion B112 and the case 200.

[0064] In some embodiments, the protective layer includes a blue adhesive and / or a green adhesive. The embodiments of the present application do not further limit the type of adhesive member as long as it can prevent a short circuit between the second part B112 and the case 200.

[0065] In addition, the shape of the second polarity active layer B120 applied to the first portion B111 is determined by the shape of the first electrode plate A100 that is closest to the second stacked cell 120 of the first stacked cell 110, and the shapes of both can be set according to the shape of the actual battery chamber.

[0066] In some embodiments, the second polarity active layer B120 is also applied to the surface of the second portion B112 except for the surface where the protective layer is located. The entire surface of the second current collector B110 that is closest to the first stacked cell 110 may be coated with the second polarity active layer B120 (i.e., the second polarity active layer B120 is applied to the surfaces of the first portion B111 and the second portion B112 that are closest to the first stacked cell 110), or the second polarity active layer B120 may be applied only to the surface of the first portion B111. In either of the above coating methods, a protective layer is provided on the surface of the second portion B112 that is closest to the first stacked cell 110.

[0067] As shown in (c) of Figure 10, in the cell 100' according to the embodiment of the present application, the first electrode plate A100 includes a first current collector A110 and a first polarity active layer A120 coated on the surface of the first current collector A110, and the first polarity active layer A120 of the first electrode plate A100 closer to the second stacked cell 120 of the first stacked cell 110 is disposed opposite the second polarity active layer B120 of the second electrode plate B100 closer to the first stacked cell 110 of the second stacked cell 120.

[0068] In some embodiments, facing (or facing opposite) means that the first polarity active layer A120 of the first electrode plate A100 closest to the second stacked cell 120 of the first stacked cell 110 and the second polarity active layer B120 of the second electrode plate B100 closest to the first stacked cell 110 of the second stacked cell 120 are placed side by side.

[0069] In some embodiments, the first current collector A110 may be an aluminum foil, and the thickness of the first current collector A110 is 10 μm or more. The second polarity active layer B120 is a negative electrode active layer, and may include graphite or the like, and the thickness of the second polarity active layer B120 is 20 μm or more.

[0070] Note that the first polarity active layer A120 must have a corresponding second polarity active layer B120; otherwise, lithium deposition will occur. The second polarity active layer B120 does not have to correspond to the first polarity active layer A120. That is, when the projection of the first stacked cell 110 is positioned within the projection of the second stacked cell 120 in a plane parallel to the first electrode plate A100, the electrode plate of the second stacked cell 120 closest to the first stacked cell 110 is installed as the second electrode plate B100, and the electrode plate of the first stacked cell 110 closest to the second stacked cell 120 is installed as the first electrode plate A100.

[0071] In some embodiments, the first plate A100 is a positive plate and the second plate B100 is a negative plate.

[0072] In some embodiments, the first stacked cell 110 and the second stacked cell 120 both include a plurality of first tabs A and a plurality of second tabs B. The plurality of first tabs A of the first stacked cell 110 and the plurality of first tabs A of the second stacked cell 120 have an overlapping area when projected in a plane parallel to the first electrode plate A100, and / or the plurality of second tabs B of the first stacked cell 110 and the plurality of second tabs B of the second stacked cell 120 have an overlapping area when projected in a plane parallel to the first electrode plate A100. Here, the first tabs A represent positive electrode tabs, and the second tabs B represent negative electrode tabs. A positive electrode plate corresponds to a positive electrode tab, and a negative electrode plate corresponds to a negative electrode tab.

[0073] The cell 100' according to the embodiment of the present application further includes a fifth separator 160 bonded to the first electrode plate A100 near the second stacked cell 120 of the first stacked cell 110, and the fifth separator 160 is bonded integrally to the second polar active layer B120 near the first stacked cell 110 of the second stacked cell 120.

[0074] Specifically, the second polarity active layer B120 and the fifth separator 160 are bonded together by a hot pressing process.

[0075] In the non-charged / discharged state, the role of the separator is to prevent short circuits, and in the charged / discharged state, charged ions (e.g., lithium ions) migrate through the pores of the separator. For example, in the charged state, lithium ions migrate from the positive electrode to the negative electrode, and in the discharged state, lithium ions migrate from the negative electrode to the positive electrode.

[0076] 3 shows a structural schematic diagram of a first electrode plate facing the second stacked cell of a first stacked cell according to an exemplary embodiment of the present application. As shown in FIG. 3, the first electrode plate A100 facing the second stacked cell 120 of the first stacked cell 110 includes a first current collector A110 and a first polar active layer A120 coated on the surface of the first current collector A110 that is closer to the second stacked cell 120.

[0077] Specifically, the first polarity active layer A120 is a positive electrode active layer, and includes ternary lithium, lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, etc., and the thickness of the first polarity active layer A120 is 30 μm or more.

[0078] Furthermore, for a given battery case volume, the more positive electrode plates the cell 100' contains, the higher its charge capacity. Therefore, for a given battery case volume, the first electrode plate A100 is installed as the electrode plate facing the second stacked cell 120 of the first stacked cell 110, thereby increasing the number of first electrode plates A100 in the cell 100' and improving the charge capacity of the cell 100'. Therefore, the first stacked cell 110 according to the embodiment of the present application improves the charge capacity of the cell 100'.

[0079] The cell 100' according to the embodiment of the present application further includes a first separator 130 bonded to the first polarity active layer A120 of the first electrode plate A100 facing the second stacked cell 120 of the first stacked cell 110. Here, the fifth separator 160 and the first separator 130 have the same structure but differ in their installation positions. In addition, the separator and active layer referred to in the present application are bonded together by a hot pressing process.

[0080] 4 is a structural schematic diagram of a first electrode plate facing the first stacked cell of a second stacked cell according to an exemplary embodiment of the present application. As shown in FIG. 4, in a cell 100' according to the embodiment of the present application, the first electrode plate A100 facing the first stacked cell 110 of the second stacked cell 120 includes a first current collector A110 and a first polarity active layer A120 coated on the surface of the first current collector A110 closer to the first stacked cell 110. The cell 100' according to the embodiment of the present application further includes a second separator 140 bonded to the first polarity active layer A120 of the first electrode plate A100 facing the first stacked cell 110 of the second stacked cell 120.

[0081] According to the principle mentioned in the embodiment shown in FIG. 3, when the volume of the battery case is the same, the plate facing the first stacked cell 110 of the second stacked cell 120 is installed as the first plate A100, thereby increasing the number of first plates A100 in the cell 100′ and thereby improving the charge capacity of the cell 100′.

[0082] 5 shows a schematic diagram of a cell structure according to another exemplary embodiment of the present application. As shown in FIG. 5, in a plane parallel to the first electrode plate A100, the projection of at least one side of the first stacked cell 110 overlaps the projection of at least one side of the second stacked cell 120, thereby ensuring that the boundaries of the first stacked cell 110 and the second stacked cell 120 are aligned, preventing the first stacked cell 110 and the second stacked cell 120 from shaking, and avoiding rupture of the case 200 due to misalignment of the first stacked cell 110 and the second stacked cell 120.

[0083] 6 shows a schematic diagram of a cell structure according to another exemplary embodiment of the present application. As shown in FIG. 6, the embodiment of the present application shows three other planar patterns of the first stacked cell 110 and the second stacked cell 120 (i.e., the shapes of the first stacked cell 110 and the second stacked cell 120 projected onto a plane parallel to the first plate A100). The embodiment of the present application does not further limit the shapes of the first stacked cell 110 and the second stacked cell 120 projected onto a plane parallel to the first plate A100, and can flexibly adapt to battery chamber structures of different shapes.

[0084] 7 shows a structural schematic diagram of an insulating layer according to one exemplary embodiment of the present application. As shown in FIG. 7, a first electrode plate A100 includes a first current collector A110, and an insulating layer W is disposed in an end region of the first current collector A110 near the first tab A.

[0085] Because the plates are formed by slicing, burrs are likely to form on the cut surfaces around the positive and negative plates, especially on the positive electrode tab of the positive plate. If the burrs penetrate the separator and connect to the negative plate, they can cause serious short-circuiting problems. In light of this, an insulating layer W is provided in an area near one end of the first current collector A110, near the first tab A. The insulating layer W has a width of 3 mm or more, a length equal to the length of the first current collector A110, and a thickness of 10 μm or more. The insulating layer W may be made of an insulating material such as ceramic, so that the insulating layer W is used to prevent short circuits.

[0086] 8 shows a structural schematic diagram of a composite unit according to one exemplary embodiment of the present application. As shown in FIG. 8, a cell 100′ according to this embodiment of the present application further includes a plurality of composite units 150, each of which includes a third separator 151, a first electrode plate A100, a fourth separator 152, and a second electrode plate B100, which are stacked in order and bonded to one another. The portion of the third separator 151 extending beyond the first electrode plate A100 is bonded to the portion of the fourth separator 152 extending beyond the first electrode plate A100. The third separator 151 and the fourth separator 152 enclose the first electrode plate A100, thereby preventing direct contact between the first electrode plate A100 and the second electrode plate B100 and preventing a short circuit between the first electrode plate A100 and the second electrode plate B100 during a non-charge / discharge state.

[0087] Specifically, the fifth separator 160, the first separator 130, the second separator 140, the third separator 151 and the fourth separator 152 all include an adhesive coating film or a ceramic coating film, and the thickness of the separators is 5 μm or more.

[0088] In some embodiments, the second electrode plate B100 includes a second current collector B110 and a second polarity active layer B120 coated on the surface of the second current collector B110. The second current collector B110 may be a copper foil, and the thickness of the second current collector B110 may be 1 μm or more. The second polarity active layer B120 is a negative electrode active layer and may include, for example, graphite, and the thickness of the second polarity active layer B120 may be 20 μm or more.

[0089] 9 is a structural schematic diagram of a battery according to one exemplary embodiment of the present application. As shown in FIG. 9, one embodiment of the present application provides a battery 10, which includes the cell 100 and case 200 described in any one of the above embodiments.

[0090] In some embodiments, the first electrode plate A100 of the first stacked cell 110 facing the second stacked cell 120 includes a first current collector A110, and the first current collector A110 is disposed opposite the case 200, and / or the first electrode plate A100 of the second stacked cell 120 facing the first stacked cell 110 includes a first current collector A110, and the first current collector A110 is disposed opposite the case 200. Specifically, "the first current collector A110 and the case 200 are disposed opposite each other" means that the first current collector A110 and the case 200 are disposed adjacent to each other.

[0091] The battery 10 described in the embodiments of the present application can be flexibly adapted to different stepped battery compartment structures, which is advantageous for the development of smart products in the direction of lighter weight and smaller size. The battery 10 described in the embodiments of the present application may be a lithium battery.

[0092] Although the basic principles of the present application have been described above with reference to specific embodiments, the advantages, merits, effects, etc. mentioned in the present application are merely examples and are not limiting. These advantages, merits, effects, etc. are not necessarily required for each embodiment of the present application. Furthermore, the specific details disclosed above are merely for illustrative purposes and ease of understanding and are not limiting. The details do not necessarily limit the present application to be realized with the specific details described above.

[0093] Block diagrams of components, apparatus, devices, and systems in this application are merely exemplary and are not intended to require or imply that they must be connected, arranged, or installed in the manner shown in the block diagrams. Those skilled in the art will be able to connect, arrange, or install these components, apparatus, devices, and systems as desired. Although words such as "including," "comprising," and "having" are open-ended words, they mean "including but not limited to" and may be used interchangeably. As used herein, the terms "or" and "and" refer to, and may be used interchangeably with, the term "and / or," unless the context clearly indicates otherwise. As used herein, the term "for example" means, and may be used interchangeably with, the phrase "for example, but not limited to."

[0094] In addition, in the apparatus, device, and method of the present application, each component or each step can be disassembled and / or reassembled, and such disassembly and / or reassembly should be considered as an equivalent solution of the present application.

[0095] The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0096] The foregoing description has been given for purposes of illustration and description. It is not intended to limit the embodiments of the present application to the precise form disclosed. While several exemplary aspects and embodiments have been described above, those skilled in the art will recognize variations, modifications, variations, additions and subcombinations thereof. [Explanation of symbols]

[0097] 100, 100' cells 110 First stacked cell 120 Second stacked cell A100 1st plate B100 2nd pole plate A. First Tab B. Second Tab A110 First current collector A120 1st polar active layer B110 Second current collector B120 2nd polar active layer B111 Part 1 B112 2nd part 130 First separator 140 Second separator W Uncoated area 150 Combined Unit 151 Third separator 152 4th separator 160 5th separator 10 batteries 200 cases h1 Thickness of the first stacked cell h2 Thickness of the second stacked cell a Difference in length b Width difference

Claims

1. A cell, the cells include a first stacked cell and a second stacked cell that are stacked, each of the first stacked cell and the second stacked cell includes a plurality of first plates and second plates that are alternately stacked, and in a plane parallel to the plurality of first plates, a projection of the first stacked cell is located within a range of a projection of the second stacked cell; A cell characterized by:

2. the first stacked cell and the second stacked cell each include a plurality of first tabs and a plurality of second tabs; In a plane parallel to the plurality of first plates, projections of the plurality of first tabs included in the first stacked cell and projections of the plurality of first tabs included in the second stacked cell have an overlapping region, and / or in a plane parallel to the plurality of first plates, projections of the plurality of second tabs included in the first stacked cell and projections of the plurality of second tabs included in the second stacked cell have an overlapping region.

2. The cell of claim 1.

3. further comprising a case enclosing the first stacked cells and the second stacked cells; 3. The cell according to claim 1 or 2.

4. Each second electrode plate includes a second current collector and a second polar active layer coated on a surface of the second current collector; a second current collector of a second electrode plate of the second stacked cell that is closer to the first stacked cell includes a first portion disposed to face the first electrode plate of the first stacked cell that is closer to the second stacked cell, and a second portion connected to the first portion; the second polarity active layer includes a portion formed on the first portion; a protective layer is provided on a surface of the second portion close to the first stacked cell; The cell according to any one of claims 1 to 3.

5. The protective layer includes a blue adhesive and / or a green adhesive.

5. The cell of claim 4.

6. the second polar active layer further includes a portion located between the second portion and the protective layer.

5. The cell of claim 4.

7. Each first electrode plate includes a first current collector and a first polar active layer coated on a surface of the first current collector; a first current collector of a first electrode plate of the first stacked cell that is closer to the second stacked cell is disposed to face a first current collector of a first electrode plate of the second stacked cell that is closer to the first stacked cell; The cell according to any one of claims 1 to 6.

8. a first current collector of a first electrode plate of the first stacked cell that is closer to the second stacked cell is bonded to a first current collector of a first electrode plate of the second stacked cell that is closer to the first stacked cell by any one of a hot melt adhesive, a polypropylene adhesive, and a double-sided tape; 8. The cell of claim 7.

9. Each first electrode plate includes a first current collector and a first polar active layer applied to a surface of the first current collector, and each second electrode plate includes a second current collector and a second polar active layer applied to a surface of the second current collector; The first polarity active layer of the first electrode plate of the first stacked cell that is closer to the second stacked cell is disposed to face the second polarity active layer of the second electrode plate of the second stacked cell that is closer to the first stacked cell. The cell according to any one of claims 1 to 6.

10. The cell further includes a fifth separator bonded to a first electrode plate of the first stacked cell that is closer to the second stacked cell, and the fifth separator is integrally bonded to a second polar active layer of the second stacked cell that is closer to the first stacked cell. The cell according to any one of claims 1 to 9.

11. a first electrode plate of the first stacked cell facing the second stacked cell includes a first current collector and a first polar active layer applied to a surface of the first current collector that is closer to the second stacked cell; The cell according to any one of claims 1 to 10.

12. The battery further includes a first separator bonded to a first polar active layer applied to a surface of the first current collector that is closer to the second stacked cell.

12. The cell of claim 11.

13. a first electrode plate of the second stacked cell facing away from the first stacked cell includes a first current collector and a first polar active layer applied to a surface of the first current collector that is closer to the first stacked cell; A cell according to any one of claims 1 to 12.

14. The battery further includes a second separator bonded to a first polar active layer applied to a surface of the first current collector that is closer to the first stacked cell.

14. The cell of claim 13.

15. In a plane parallel to the plurality of first plates, a projection of at least one side of the first stacked cell overlaps a projection of at least one side of the second stacked cell. A cell according to any one of claims 1 to 14.

16. The first stacked cell and the second stacked cell each include a plurality of first tabs and a plurality of second tabs, and each first electrode plate includes a first current collector, and an insulating layer is provided on an end region of the first current collector that is close to the corresponding first tab.

16. The cell according to claim 1, wherein the cell is a polycrystalline silicon.

17. The battery further includes a plurality of composite units, each of which includes a third separator, a first electrode plate, a fourth separator, and a second electrode plate stacked in sequence.

17. A cell according to any one of claims 1 to 16.

18. a portion of the third separator extending beyond the first plate is bonded to a portion of the fourth separator extending beyond the first plate; 18. The cell of claim 17.

19. the first electrode plate is a positive electrode plate, The second electrode plate is a negative electrode plate. A cell according to any one of claims 1 to 18.

20. A cell according to any one of claims 1 to 19, and a case. A battery characterized by:

21. a first electrode plate of the first stacked cell facing the second stacked cell includes a first current collector, the first current collector being disposed to face the case; and / or a first electrode plate of the second stacked cell facing back to the first stacked cell includes a first current collector, and the first current collector is disposed to face the case; 21. The battery of claim 20.

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