Battery plates, cells and batteries

Abstract

This application provides a battery plate, cell, and battery. The battery plate includes a pasted region and a tab, the tab including an empty foil region, the pasted region including a current collector and an active material layer disposed on the current collector, the empty foil region having three outer edges, at least one of the outer edges having a second treated region at an edge, the second treated region having a thickness equal to or greater than the thickness of the remaining areas of the empty foil region excluding the second treated region. The battery plate has increased tab strength, eliminating the risk of battery failure due to the tab being prone to corner bending. This effectively solves the problem in related art of cell failure or the impact on the electrochemical quality of the battery due to the weak tab strength being prone to folding or corner bending, and significantly improves the electrochemical quality and safety of the battery.

Description

[Technical Field]

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

[0002] Battery cells are formed by stacking or winding electrode plates. The electrode plates include a pasted area and a tab. The pasted area is formed by a current collector and an active material layer applied to the current collector, while the tab is typically formed by a foil area (i.e., a blank foil area) where no active material is applied. Electrode plates are typically manufactured by cutting metal foil to a predetermined shape using a metal cutting machine. However, after die-cutting, the tabs are prone to folds and bent corners. These factors affect the electrochemical quality of the battery and increase the risk of battery failure. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of this, the embodiments of the present application provide a battery plate to solve the problems of battery failure caused by the phenomenon of folding back or corner bending of the tab in the related art. [Means for solving the problem]

[0004] One aspect of the present application provides a battery plate, the battery plate including a pasted region and a tab, the tab including a blank foil region, the pasted region including a current collector and an active material layer located on the current collector, the blank foil region having three outer sides, an edge of at least one of the outer sides including a second treated region, the second treated region having a thickness equal to or greater than the thickness of the remaining region of the blank foil region excluding the second treated region.

[0005] In one embodiment, the tab further includes a coating transition region, the coating transition region having an active material layer connected to the paste coating region, a first treatment region formed on the edge of the side of the coating transition region, the thickness of the current collector in the first treatment region being equal to or greater than the thickness of the current collector in other regions of the coating transition region excluding the first treatment region, and the second treatment region being in contact with the first treatment region.

[0006] In one embodiment, the width of the first treated region gradually increases along the direction from the applied transition region to the blank foil region.

[0007] In one embodiment, the application transition region further includes a first influence region located inside the first treatment region, and the first influence region is an inactive region.

[0008] In one embodiment, a second affected area is further formed in the blank foil area, the second affected area being located inside the second treated area, and the thickness of the second treated area is equal to or greater than the thickness of the second affected area.

[0009] In one embodiment, the width of the first treatment region is 100 μm or less.

[0010] In one embodiment, the width of the first affected area is 100 μm or less.

[0011] In one embodiment, the width of the second treatment area is greater than the width of the first treatment area.

[0012] In one embodiment, the width of the second area of ​​influence is greater than the width of the first area of ​​influence.

[0013] In one embodiment, the width of the second treatment region is 150 μm or less.

[0014] In one embodiment, the width of the second affected area is 100 μm or less.

[0015] In one embodiment, the thickness of the second treatment region is equal to or greater than the thickness of the first treatment region.

[0016] In one embodiment, the thickness of the boundary between the first treated region and the second treated region is equal to or greater than the thickness of the second treated region.

[0017] In one embodiment, the average thickness of the current collector of the battery plate<the thickness of the first treated region≦1.08 times the average thickness of the current collector of the battery plate.

[0018] In one embodiment, 1.01 times the average thickness of the current collector of the battery plate≦thickness of the boundary between the first treated area and the second treated area≦1.15 times the average thickness of the current collector of the battery plate.

[0019] In one embodiment, the average thickness of the current collector of the battery plate < the thickness of the first treated area ≦ the thickness of the second treated area ≦ the thickness of the boundary between the first treated area and the second treated area ≦ 1.2 times the average thickness of the current collector of the battery plate.

[0020] In one embodiment, the average thickness of the current collector of the battery plate is 50 μm or less.

[0021] In one embodiment, molten beads are formed in the first treatment region, and the diameter of the molten beads is 45 μm or less.

[0022] In one embodiment, all of the three outer edges have the second treatment region.

[0023] In one embodiment, the tab has a first foil surface, a second foil surface, and a side surface extending along the thickness direction, and the second treated region includes an area extending along the first foil surface, an area extending along the second foil surface, and an area extending along the side surface.

[0024] In one embodiment, the thickness of the second treated region is 1 to 3 times the thickness of the remaining region of the blank foil region excluding the second treated region.

[0025] In one embodiment, the second treatment region has a thickness of 30 μm to 100 μm.

[0026] In one embodiment, a third treatment area is formed on the edge of the outer side of the paste application area, and the third treatment area is an inactive area.

[0027] In one embodiment, the foil material of the battery plate is aluminum or copper.

[0028] Another aspect of the present application further provides a battery plate, the battery plate including a pasted region and a tab, the tab including a pasted transition region and a blank foil region, the pasted region including a current collector and an active material layer located on the current collector, the pasted transition region including an active material layer connected to the pasted region, a first treated region formed on a side edge of the pasted transition region, the current collector thickness in the first treated region being equal to or greater than the current collector thickness in other regions of the pasted transition region excluding the first treated region, and the width of the first treated region gradually increasing along a direction from the pasted transition region to the blank foil region.

[0029] Another aspect of the present disclosure provides a cell, the cell comprising any one of the battery plates described above.

[0030] Another aspect of the present application provides a battery, the battery including the cell described above. [Effects of the Invention]

[0031] According to the battery plate of the present application, a blank foil area is provided on the tab, and a second treated area is formed on the edge of the outer side of the blank foil area, the thickness of the second treated area is equal to or greater than the thickness of the other areas of the blank foil area excluding the second treated area, and the second treated area extends along the outer side of the blank foil area to form a hard edge portion of the tab, which significantly improves the strength and hardness of the tab edge and effectively prevents the tab from being folded over or bent at the corners during the battery manufacturing process after die-cutting, thereby effectively avoiding the risk of battery defects caused by the tab being folded over or bent at the corners, improving battery safety and battery quality. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 2 is a schematic plan view of a battery plate in an example of the present application. [Figure 2] FIG. 2 is a schematic side view of a battery plate in one direction according to an embodiment of the present application. [Figure 3] FIG. 2 is a schematic plan view of a battery plate in an example of the present application. [Figure 4] FIG. 10 is a schematic side view of the tab in the embodiment of the present application taken along another direction. [Figure 5] FIG. 1 is a diagram showing the external appearance of a tab at a first magnification of a microscope. [Figure 6] FIG. 10 is a diagram showing the external appearance of the tab at the second magnification of the microscope. [Figure 7] FIG. 2 is a schematic plan view of a battery plate in an example of the present application. [Figure 8] 3 is a side view of a battery electrode plate according to an embodiment of the present application, taken along the direction shown in FIG. 2. FIG. [Figure 9] FIG. 1 is a diagram showing the external appearance of a tab observed under a microscope. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative work fall within the scope of protection of the present application.

[0034] In related technologies, electrodes are typically manufactured by cutting metal foil into a predetermined shape using a metal cutting device. However, because the tabs are thin, flexible, and have low strength, they are prone to folding over or corner bending after die-cutting. These factors affect the electrochemical quality of the battery and increase the risk of battery defects.

[0035] Hereinafter, battery plates according to some embodiments of the present application will be described with reference to FIGS.

[0036] 1 to 3, the battery plate includes a tab 1' and a paste application region 2', an active material layer is applied to the paste application region 2', and one side of the tab 1' is connected to the paste application region 2', so that a total of three outer edges are exposed in the circumferential direction. The tab 1' has a blank foil region 10', which refers to a current collector region in which an active material layer is not provided in the foil material, and since the current collector in the blank foil region 10' is made of foil material, the blank foil region 10' may be understood to be made of foil material.

[0037] As shown in FIG. 1, all areas of the tab 1' may be blank foil areas, or as shown in FIG. 2, some areas of the tab 1' may be blank foil areas 10' and other areas may be applied transition areas 20, which have an active material layer connecting to the paste applied area 2'.

[0038] The empty foil region 10' has three outer sides (referring to sides exposed to the outside and not connected to other components, the same applies below). A second processed region 121' is formed on the edge of at least one of the three outer sides of the empty foil region 10', and the thickness of the second processed region 121' is greater than the thickness of the other regions 12 of the empty foil region 10' excluding the second processed region 121', that is, the second processed region 121' is a hard edge region.

[0039] In some embodiments, the edges of the three outer sides are all formed with second treated regions 121'. As shown in FIG. 1, the second treated regions 121' extend along the outer sides of the tab 1' to form hard edge portions of the tab 1', significantly improving the strength and hardness of the edges of the tab 1' and also improving the overall strength and hardness of the tab 1' to some extent. This effectively prevents the tab 1' from being folded over or bent at the corners during the battery manufacturing process after die-cutting, effectively avoiding the risk of battery defects caused by the folded over or bent corners of the tab 1', improving the safety of the battery and improving the quality (e.g., electrochemical quality) of the battery.

[0040] As described above, the battery plate according to this embodiment eliminates the risk factors of battery failure due to the weak strength of the tab 1' and the tendency for the corners to break, and solves the problems of the related art in which the weak strength of the tab 1' causes the tab 1' to be easily folded or bent, which affects the cell failure and the electrochemical quality of the battery, thereby significantly improving the electrochemical quality and safety of the battery. Furthermore, by increasing only the thickness of the second treated region 121' at the edge of the tab 1' rather than the entire thickness of the tab 1', it is possible to avoid excessive impact on the cost, process, and current collection performance of the battery plate.

[0041] In one embodiment, the second processed region 121' is a region where the edge is melted and then condensed to form a molded shape, i.e., a fused region, or a sintered region. For example, a foil material is cut with a laser to form a sintered edge, or a fused edge is formed under the influence of high temperature, i.e., a fused or sintered edge is formed on the tab 1'. As shown in FIGS. 5 and 6, the second processed region 121' is free of sharp or long burrs, and even has almost no burrs, significantly preventing burrs from forming on the edges of the tab 1'. The almost no burrs on any of the three outer edges of the tab 1' effectively eliminates the risk of battery failure due to burrs penetrating the battery separator and ensures improved battery quality and performance.

[0042] The second treated region 121' extends along the edge of the tab 1' to form a hard edge portion of the tab 1'. This hard edge portion is formed by melting the foil material 3 at the edge of the tab 1' and then condensing or sintering it. That is, the second treated region 121' undergoes a single quenching process, significantly improving the strength and hardness of the second treated region 121'. In addition, the thickness of the second treated region 121' is greater than the thickness of the other regions 12 of the blank foil region 10'. As a result, the edge of the tab 1' has a hard edge portion that is harder and stronger than the other regions 12 of the blank foil region 10'. This significantly improves the strength of the tab 1' itself and significantly reduces the phenomenon of folding back or corner bending of the tab 1'.

[0043] Of course, in other embodiments, the second processing block 121' may be formed by other molding methods. For example, after the tab 1' and the pasting area 2' are die-cut, the edge of the tab 1' is heated to a high temperature to melt the edge area of ​​the tab 1', and then cooled and condensed to form the second processing area 121'. Alternatively, the edge of the tab 1' may be sintered to form the second processing area 121'.

[0044] As shown in Figures 1 to 3, the tab 1' has a first foil surface, a second foil surface, and a side surface, where the side surface refers to a surface extending along the thickness direction and located between the first foil surface and the second foil surface. The second treated region 121' has a structure formed integrally with other regions 12 in the empty foil region 10'. The second treated region 121' includes a region extending along the first foil surface, a region extending along the second foil surface, and a region extending along the side surface.

[0045] Since the second processed area 121' is not thinner than the other areas 12 in the empty foil area 10', as shown in Figure 4, the second processed area 121' covers the edge areas of the other areas 12 in the empty foil area 10' (i.e., the positions where the foil material 3 is located in Figure 4), i.e., the upper and lower surfaces of the second processed area 121' are both higher than the foil surfaces (referring to the first foil surface and the second foil surface) of the other areas 12 in the empty foil area 10'.

[0046] The thickness of the second treated region 121' is equal to or greater than the thickness of the other regions 12 in the empty foil region 10'. In some embodiments, the thickness of the second treated region 121' is 1 to 3 times the thickness of the other regions 12 in the empty foil region 10', and the thickness of the second treated region 121' may be up to 3 times the thickness of the other regions 12 in the empty foil region 10'.

[0047] To give a specific example using numerical values, in some embodiments, the thickness of the second processing region 121′ is 30 μm to 100 μm, and specifically may be 30 μm, 40 μm, 50 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm. In some embodiments, the width of the second processing region 121′ (width refers to the dimension from the outside of the edge to the inside of the edge, the same applies below) is 30 μm to 150 μm, and specifically may be 30 μm, 40 μm, 50 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, or 150 μm.

[0048] In some embodiments, as shown in FIG. 1, the tab 1' is entirely an empty foil region 10'. In other embodiments, as shown in FIG. 2, the tab 1' further includes a coated transition region 20, which is located on the side of the tab 1' adjacent to the pasted region 2'. An active material layer is present on the foil material in the coated transition region 20, and the active material layer in the coated transition region 20 connects to the active material layer in the pasted region 2'. As shown in FIG. 3, the coated transition region 20 has two outer edges, and a first treated region 13 is formed on each edge of the two outer edges. The current collector thickness in the first treated region 13 is thicker than the current collector thickness in the other regions of the coated transition region 20, excluding the first treated region 13, and the first treated region 13 contacts the second treated region 121'. The first treated region 13 is also an inactive region, i.e., a region where the active material layer does not provide effective electrical conductivity.

[0049] The first treated area 13 contacts the second treated area 121' on the side of the tab 1'. This forms a hard edge along the entire edge of the tab 1'. The first treated area 13 may be formed in the same process as the second treated area 121', i.e., it may be a sintered or fused edge. As shown in FIGS. 5 and 6, the first treated area 13 does not have sharp or long burrs, and is almost completely burr-free. This significantly prevents burrs from forming on the edge of the tab 1', effectively eliminating the risk of battery defects caused by burrs penetrating the battery separator, and ensuring improved battery quality and performance.

[0050] The current collector in the first processed region 13 has a thickness of 30 μm to 100 μm and a width of 30 μm to 150 μm. The width of the first processed region 13 is equal to or smaller than the width of the second processed region 121′.

[0051] One side of the tab 1' is a pasted region 2', which includes a current collector and an active material layer coated on the current collector. A third treated region is formed on the outer edge of the pasted region 2'. This third treated region is an inactive region, i.e., a region that does not provide effective electrical conductivity. The third treated region may also be a sintered region, so the current collector in the third treated region is thicker than the current collector in the remaining areas of the pasted region 2' excluding the third treated region. The tab also has a first treated region 13 and a second treated region 121' on its edge, which increases the edge strength of the entire outer edge of the battery plate, improving the plate's overall strength, damage resistance, and impact resistance, thereby better ensuring the quality and safety of the battery.

[0052] The width and thickness of the third treated region may be within the width and thickness ranges of the second treated region 121', or may be within other numerical ranges.

[0053] The third treated area may also be a melting and condensing area or a sintered area, so that there are almost no burrs on the edge of the third treated area, which means that there are almost no burrs on the edge of the entire battery plate, thereby more reliably ensuring the safety of the battery.

[0054] The foil material 3 of the battery plate is aluminum or copper. For example, the foil material 3 is aluminum, and the battery plate forms a positive plate, and the tab 1' forms a positive tab. Alternatively, for example, the foil material 3 is copper, and the battery plate forms a negative plate, and the tab 1' forms a negative tab. Needless to say, in other embodiments, the foil material 3 of the battery plate may be other metal foils, such as stainless steel plated with carbon, nickel, titanium, or silver, or an aluminum-cadmium alloy plated with carbon, nickel, titanium, or silver.

[0055] Another embodiment of the present application further provides a cell. The cell includes a battery plate, which may be formed by winding or stacking battery plates, and the battery plate is the battery plate described in the above embodiment. The cell has almost no burrs on the edge of the tab 1' or the entire edge of the battery plate, and the strength is enhanced to reduce the risk of battery failure, thereby improving the electrochemical quality and usage safety of the battery.

[0056] Other embodiments of the present application further provide a battery, which can be said to include the cell according to the above embodiment and the battery plate according to the above embodiment. Compared with batteries in the related art, this battery reduces the risk of defects, eliminates the risk of battery quality degradation or battery failure due to burrs breaking through the separator and tab 1' folding back, and improves both electrochemical quality and usage safety. The process of deriving the technical effects of the above cell and battery is substantially the same as the process of deriving the technical effects of the above battery plate, and therefore will not be described again here.

[0057] Hereinafter, battery plates according to several other embodiments of the present application will be described with reference to FIGS.

[0058] In related art, the paste-coated area is formed by the current collector and an active material layer coated on the current collector, while the tab is typically formed by a foil area (i.e., a blank foil area) where no active material is coated. This results in different stresses, i.e., different strengths, between the paste-coated area and the tab. In this case, the stress changes sharply at the boundary between the paste-coated area and the tab, resulting in a large difference in strength between the two areas. Furthermore, because the tab is light, soft, and has low strength, it is prone to wrinkles and cracks at the boundary during the roll press process (the roll pressure is high due to the high stress in the paste-coated area) after cutting and forming the tab. These phenomena degrade the quality of the battery and affect the battery's safety in use.

[0059] As shown in Figures 7 and 8, the battery plate includes a pasted region 2 and a tab 1, the tab 1 including a pasted transition region 11 and a blank foil region 10, the pasted region 2 being formed by a region of the plate having an active material layer, and the pasted region 2 including the current collector in that region and the active material layer coated on the current collector.

[0060] Typically, the tab 1 is formed by a blank foil region 10 located on one side of the paste application region 2. The blank foil region 10 is a current collector region not coated with active material, and is also a foil region. However, in this embodiment, a coated transition region 11 is formed at the boundary between the tab 1 and the paste application region 2. The coated transition region 11 is located between the paste application region 2 and the blank foil region 10, protrudes from the side of the paste application region 2 closer to the tab 1, and is formed at one end of the tab 1 that connects to the paste application region 2. An active material layer is present on the current collector within the coated transition region 11. In this case, there is also an active material layer at the end of the tab 1 that connects to the paste application region 2 (i.e., the boundary between the tab 1 and the paste application region 2), which increases the overall strength of the region, i.e., increases the strength of the boundary between the tab 1 and the paste application region 2.

[0061] A treatment area referred to as a first treatment area 111 is formed on the side edge of the coating transition area 11, and the side of the coating transition area 11 is the side extending in the direction from the paste coating area 2 to the tab 1, and is also the side of the boundary portion and the side of one end of the tab 1 that connects to the paste coating area 2. The thickness of the current collector in the first treatment area 111 (i.e., the thickness of the current collector in that area) is equal to or greater than the thickness of the current collector in other areas of the coating transition area 11 (i.e., the thickness of the current collector in the area inside the first treatment area 111).

[0062] That is, compared to other regions in the coating transition region 11, the first processed region 111 has a larger thickness, and the thickness of this region is equal to or greater than the thickness of other regions (other regions are sheet-like) inside the edge (i.e., inside in the direction from the outside of the edge to the inside of the edge, the same applies below). As a result, the boundary between the tab 1 and the paste coating region 2 (i.e., the edge of the connecting end of the tab 1) has a hard edge portion that has higher hardness and strength than other regions within the edge, significantly improving the strength and hardness at the boundary between the paste coating region 2 and the tab 1.

[0063] Additionally, the width of the first treated region 111 (width refers to the dimension from the outside of the edge to the inside of the edge, the same applies below) gradually increases along the direction from the coating transition region 11 to the empty foil region 10, i.e., the edge region with reinforced strength and hardness becomes wider as it approaches the empty foil region 10. This significantly reduces the stress difference between the paste coating region 2 and the tab 1 and the degree of change in strength at the boundary, ensuring that the strength in the direction from the paste coating region 2 to the tab 1 changes gradually rather than suddenly, and improving the overall strength and hardness of the tab 1.

[0064] In this way, the battery plate of this embodiment can significantly improve the deformation resistance, such as tensile resistance and pressure resistance, of the boundary between the tab 1 and the paste application area 2, and even of the entire tab 1, effectively avoiding the phenomenon of wrinkles or cracks at the boundary caused by the tab 1 being subjected to force during the battery manufacturing process after die-cutting. This effectively avoids the risk of battery defects caused by wrinkles or cracks in the tab 1, improves the safety of the battery, improves the electrochemical quality of the battery, and ensures the effective service life of the battery.

[0065] A coated transition region 11 coated with active material is formed at the boundary edge of the tab 1 with the pasted region 2. This increases the stress and strength at the boundary compared to when the active material layer extends directly to the tab 1. A first treated region 111 is formed at the side edge of the coated transition region 11, and the current collector in the first treated region 111 is thicker than the current collector in other regions of the coated transition region 11. Increasing the thickness of the first treated region 111 improves the strength and hardness of the first treated region 111 to a certain extent, forming a stronger, harder edge at the boundary edge and significantly improving the strength and hardness at the boundary between the pasted region 2 and the tab 1. Additionally, the width of the first treated region 111 gradually increases from the paste applied region 2 to the tab 1, significantly reducing the stress difference between the paste applied region 2 and the tab 1 and the degree of abrupt change in strength at the boundary, while also improving the external force resistance and pressure resistance of the tab 1. This effectively prevents the tab 1 from wrinkling or cracking at the boundary during the battery manufacturing process after die cutting, effectively avoiding the risk of battery defects, improving battery safety and battery quality.

[0066] In the coating transition region 11, the thickness of the active material gradually decreases along the direction from the paste coating region 2 to the blank foil region 10, and the coating transition region 11 may be called an active material thinning region.

[0067] Furthermore, in addition to the first treatment region 111, an influence region referred to as a first influence region 112 is further formed inside the edge of the coating transition region 11 (note that "inside" refers to the inside in the direction from the outside of the edge to the inside of the edge, and the same applies below). The first influence region 112 is an inactive region, i.e., a region that cannot effectively conduct electricity. The region of the coating transition region 11 located inside the first influence region 112 is called the first basic region, and as shown in Figure 7, the coating transition region 11 includes, from the inside to the outside, the first basic region, the first influence region 112, and the first treatment region 111, in that order. The color of the outer surface of the active material layer in the first influence region 112 is different from the color of the outer surface of the active material layer in the first basic region, and is an active material discoloration region.

[0068] In some embodiments, the first treated area 111 is a melted and condensed edge forming area that forms the sintered or fused edge of the tab 1. That is, the first treated area 111 is melted and then condensed, for example, a sintered area formed by cutting a foil material with a laser. The first treated area 111 is melted and then cooled, that is, undergoes a single quenching process, which significantly improves the strength and hardness of the first treated area 111. As shown in FIG. 9, the first treated area 111 is almost burr-free, which eliminates the risk of battery failure due to burrs penetrating the battery separator, improves battery safety, and ensures the battery's useful life.

[0069] The first affected area 112 may be understood as an area that has been heated at a high temperature but has not melted. The first affected area 112 is formed by cooling after being heated at a high temperature, and the strength of the current collector in the first affected area 112 is equal to or greater than that of the current collector in the first base area that has not been affected by temperature. In this way, the strength of the boundary between the tab 1 and the paste-applied area 2 can be further increased, that is, the overall strength of the connection end of the tab 1 is improved, and phenomena such as wrinkles and cracks at the boundary can be effectively prevented when the tab 1 is subjected to a large rolling pressure.

[0070] A second treated area 121 is formed at the edge of the empty foil area 10 (i.e., one end of the tab 1 away from the paste application area 2), and the empty foil area 10 has three outer sides connected in sequence along the circumferential direction, and the second treated area 121 is formed at the edges of all three outer sides, and an affected area referred to as a second affected area 122 is also formed inside the second treated area 121. The thickness of the current collector in the second treated area 121 is equal to or greater than the thickness of the current collector in the second affected area 122 and equal to or greater than the thickness of the current collector in other areas of the empty foil area 10.

[0071] For example, the second treated area 121 is also a region where the edge is melted and condensed to form the sintered edge or fused edge of the tab 1, and is a sintered area formed, for example, by cutting the foil material with a laser. As shown in FIG. 9, the second treated area 121 is almost free of burrs, which eliminates the risk of the battery failing due to the burrs breaking through the battery separator. The strength of the current collector in the second affected area 122 is equal to or greater than the strength of the current collector in the area (which may be referred to as the second base area) located inside the second affected area 122 of the blank foil area 10, and the second affected area 122 may be a region affected by high temperatures.

[0072] The entire tab 1 includes the boundary between the tab 1 and the paste application area 2 (i.e., the first treatment area 111) and the second treatment area 121, and the edges of each side all have hard edge portions with high strength, which significantly and uniformly improves the strength of the entire edge of the tab 1, effectively improving the force-bearing capacity and deformation resistance of the tab 1, and also ensuring that the edges of the entire tab 1 are free of burrs.

[0073] In a specific production, the first processed area 111, the first affected area 112, the second processed area 121 and the second affected area 122 are all areas formed by processing through some production process, and the first processed area 111 and the second processed area 121 may be sintered areas such as sintered edges formed after a laser cutting process or molten edges formed under the influence of high temperature, and the first affected area 112 and the second affected area 122 are all areas that have been affected by high temperature but have not melted.

[0074] In the examples of the present application, when an active material layer is applied to a foil material in a certain region, the thickness of the region refers to the sum of the thickness of the foil material and the thickness of the active material layer, and the thickness of the current collector in the certain region refers to the thickness of the foil material. When an active material layer is not applied to a foil material in a certain region, the thickness of the region refers to the thickness of the foil material, or may be understood as the thickness of the current collector.

[0075] Because the first treated region 111 is a sintered edge formed after the laser cutting process or a fused edge formed under the influence of high temperature, the active material layer on the first treated region 111 is substantially eliminated after the laser cutting process or high-temperature treatment, and the thickness of the current collector in the first treated region 111 is equal to or substantially equal to the thickness of the first treated region 111, and this thickness is equal to or greater than the thickness of the current collector in other regions inside the edge of the coated transition region 11. The upper surface of the first treated region 111 is not lower than the upper surfaces of the other regions of the coated transition region 11, and the lower surface of the first treated region 111 is flush with or protrudes from the lower surfaces of the other regions of the coated transition region 11.

[0076] Similarly, the thickness of the current collector in the second treated region 121 is equal to or greater than the thickness of the other regions inside the edge of the empty foil region 10. The upper surface of the second treated region 121 is not lower than the upper surfaces of the other regions in the empty foil region 10, and the lower surface of the second treated region 121 is flush with or protrudes from the lower surfaces of the other regions in the empty foil region 10. The upper and lower surfaces refer to two surfaces in the thickness direction.

[0077] In some embodiments, the thickness T1 of the first processing region 111 is less than or equal to the thickness T2 of the second processing region 121.

[0078] In some embodiments, the thickness T2 of the second processing region 121 is less than or equal to the thickness T3 at the interface between the first processing region 111 and the second processing region 121.

[0079] Because the thickness of the current collector in the first treated region 111 is equal to or substantially equal to the thickness of the first treated region 111, T1 may be understood as the thickness of the current collector in the first treated region 111, and T3 may be understood as the thickness of the current collector at the boundary position. Because no active material layer is applied on the foil material in the second treated region 121, T2 may be understood as the thickness of the current collector in the second treated region 121.

[0080] The average thickness of the current collector of a battery plate is denoted as T. The average thickness of the current collector is the average value of the thickness of the current collector across the entire battery plate. The relationship between T, T1, T2, and T3 is expressed by the following equation:

[0081] In some embodiments, the average thickness T of the current collector of the battery plate<the thickness T1 of the first treated region 111≦1.08 times the average thickness T of the current collector of the battery plate.

[0082] In some embodiments, the thickness T3 of the boundary between the first treated area 111 and the second treated area 121 is 1.01 times the average thickness T of the current collector of the battery plate ≦ 1.15 times the average thickness T of the current collector of the battery plate.

[0083] In some embodiments, the average thickness T of the current collector of the battery plate < the thickness T1 of the first treated region 111 ≦ the thickness T2 of the second treated region 121 ≦ the thickness T3 of the boundary between the first treated region 111 and the second treated region 121 ≦ 1.2 times the average thickness T of the current collector of the battery plate.

[0084] The average thickness T of the current collector of the battery plate is less than or equal to 50 μm, for example, 10 μm, 20 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm.

[0085] To exemplify the structural characteristics of the treatment area and the affected area in specific numerical ranges, in some embodiments, the width of the first treatment area 111 is 100 μm or less, for example, 30 μm, 40 μm, 50 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm.

[0086] In some embodiments, the width of the first area of ​​influence 112 is 100 μm or less, for example, 30 μm, 40 μm, 50 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm.

[0087] In some embodiments, the width of the second processing region 121 is greater than the width of the first processing region 111 .

[0088] In some embodiments, the width of the second treatment region 121 is 150 μm or less, for example, 30 μm, 40 μm, 50 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm.

[0089] In some embodiments, the width of the second area of ​​influence 122 is greater than the width of the first area of ​​influence 112 .

[0090] In some embodiments, the width of the second area of ​​influence 122 is 100 μm or less, for example, 30 μm, 40 μm, 50 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm.

[0091] The current collector of the battery plate is aluminum foil or copper foil. For example, the current collector is aluminum foil, and the battery plate forms a positive plate, with tab 1 forming positive electrode tab 1. Alternatively, for example, the current collector is copper foil, and the battery plate forms a negative plate, with tab 1 forming negative electrode tab 1. Needless to say, in other embodiments, the current collector of the battery plate may be other metal foil, such as stainless steel plated with carbon, nickel, titanium, or silver, or an aluminum-cadmium alloy plated with carbon, nickel, titanium, or silver.

[0092] In some embodiments, the battery plate is a laser-cut member. After being cut by the laser, the first treated area 111 and the first affected area 112 are formed at the boundary edge between the tab 1 and the pasted area 2 (i.e., the edge of the applied transition area 11), and the second treated area 121 and the second affected area 122 are formed at the edge of the blank foil area 10. Of course, in other embodiments, the first treated area 111 and the second treated area 121 can be formed by other molding methods, such as by die-cutting the tab 1 and the pasted area 2, then heating the edges to a high temperature to melt the edge areas, and then cooling and condensing to form the treated areas.

[0093] Molten beads are also formed within the first processing block 111. In some embodiments, the diameter of the molten beads is 45 μm or less.

[0094] In some embodiments, a treatment area is also formed on the edge of the paste application area 2, referred to as a third treatment area. In this case, in combination with the above embodiment, a treatment area is formed on the entire edge of the battery plate, which increases the strength and hardness of the edge of the entire plate, significantly improves the deformation resistance of the entire plate, prevents wrinkling of the plate, and removes burrs from the entire edge of the plate, greatly improving the quality and safety of the battery.

[0095] Another embodiment of the present application provides a cell. The cell includes a battery plate, which may be formed by winding two battery plates or stacking multiple battery plates, as described in the above embodiment. The edge of the tab 1 of the cell or the edge of the entire battery plate is almost burr-free, and the strength of the interface between the tab 1 and the paste-coated area 2 is increased, thereby reducing the risk of battery failure and improving the electrochemical quality and usage safety of the battery.

[0096] Another embodiment of the present application further provides a battery. The battery can be said to include the cell of the above embodiment and the battery plate of the above embodiment. Compared with batteries in the related art, the battery has a reduced risk of defects, eliminates the risk of battery quality being affected or battery failure due to burrs breaking through the separator or cracks or wrinkles occurring at the border between the tab and the paste-coated area, and improves both electrochemical quality and safety in use. The process of deriving the technical effects of the cell and battery is generally the same as the process of deriving the technical effects of the battery plate, and a detailed description thereof will be omitted here.

[0097] Although the basic principles of the present application have been described above with reference to specific embodiments, the advantages, merits, and effects described herein are merely illustrative and not limiting. These advantages, merits, and effects are not necessarily provided by each embodiment of the present application. Furthermore, the specific details disclosed above are merely illustrative and for ease of understanding, and are not limiting. The details do not necessarily limit the present application to be realized by adopting the specific details.

[0098] The components and devices disclosed herein are merely exemplary and are not intended to require or suggest that they be connected, distributed, or configured in the manner shown in the drawings. As will be understood by one of ordinary skill in the art, these components and devices may be connected, arranged, or configured in any manner. For example, terms such as "including," "comprising," and "having" are open-ended terms and may mean, and be used interchangeably with, "including but not limited to." The terms "or" and "and" used herein refer to, and may be used interchangeably with, the term "and / or," unless the context clearly indicates otherwise. The term "for example" used herein means, and may be used interchangeably with, the phrase "for example, but not limited to."

[0099] In the components and devices of the present application, each component can be disassembled and / or reassembled, and such disassembly and / or reassembly should be considered as an equivalent embodiment of the present application.

[0100] 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.

[0101] It should be noted that the limiting terms "first," "second," and "third" used in the description of the embodiments of this application are merely intended to more clearly describe the technical solutions, and are not intended to limit the protection scope of this application.

[0102] The foregoing description has been given for purposes of illustration and description. It is not intended that the description be construed as limiting the embodiments of the present application to the precise form disclosed. While several exemplary aspects and embodiments have been described above, certain variations, modifications, variations, additions and subcombinations thereof will be apparent to those skilled in the art.

[0103] The above are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. [Explanation of symbols]

[0104] <Symbols in Figures 1 to 6> 1' Tab 10' empty foil area 20 Application transition area 121' Second processing area 12 Other areas in the empty foil area excluding the second processing area 13 First processing area 2' Paste application area 3 Foil material <Symbols in Figures 7 to 9> 1 tab 11 Application transition area 111 First processing area 112 1st influence area 10 Empty foil area 121 Second Processing Area 122 Second influence area 2 Paste application area.

Claims

1. a battery plate including a pasted area and a tab; the tab includes a blank foil area, and the pasted area includes a current collector and an active material layer located on the current collector; The hollow foil region has three outer sides, and an edge of at least one outer side has a second treated region, and the thickness of the second treated region is equal to or greater than the thickness of other regions in the hollow foil region excluding the second treated region. A battery plate characterized by:

2. the tab further includes a pasted transition region, the pasted transition region having an active material layer connected to the pasted region; a first processed region is formed at an edge of a side of the coating transition region, the thickness of the current collector in the first processed region is equal to or greater than the thickness of the current collector in other regions of the coating transition region excluding the first processed region, and the second processed region is in contact with the first processed region; 2. The battery plate of claim 1.

3. The width of the first treatment area gradually increases along a direction from the application transition area to the blank foil area.

3. The battery plate of claim 2.

4. The application transition area further includes a first influence area located inside the first processing area, and the first influence area is an inactive area.

4. A battery plate according to claim 2 or 3.

5. a second affected area is further formed in the blank foil area, the second affected area being located inside the second treated area, and the thickness of the second treated area is equal to or greater than the thickness of the second affected area; 5. The battery plate of claim 4.

6. The width of the first treatment region is 100 μm or less.

6. A battery plate according to claim 2.

7. The width of the first affected area is 100 μm or less; 6. A battery plate according to claim 4 or 5.

8. The width of the second treatment area is greater than the width of the first treatment area.

8. A battery plate according to claim 2.

9. The width of the second area of ​​influence is greater than the width of the first area of ​​influence.

6. The battery plate of claim 5.

10. The width of the second treatment region is 150 μm or less.

10. A battery plate according to any one of claims 1 to 9.

11. The width of the second affected area is 100 μm or less; 6. The battery plate of claim 5.

12. the thickness of the second treatment area is equal to or greater than the thickness of the first treatment area; 12. A battery plate according to any one of claims 2 to 9 and 11.

13. a thickness of the boundary between the first processing region and the second processing region is equal to or greater than a thickness of the second processing region; 13. A battery plate according to any one of claims 2 to 9, 11 and 12.

14. The average thickness of the current collector of the battery plate < the thickness of the first treated area ≦ 1.08 times the average thickness of the current collector of the battery plate; 14. A battery plate according to any one of claims 2 to 9 and 11 to 13.

15. 1.01 times the average thickness of the current collector of the battery plate≦thickness of the boundary between the first treated area and the second treated area≦1.15 times the average thickness of the current collector of the battery plate, 15. A battery plate according to any one of claims 2 to 9 and 11 to 14.

16. the average thickness of the current collector of the battery plate<the thickness of the first treated area≦the thickness of the second treated area≦the thickness of the boundary between the first treated area and the second treated area≦1.2 times the average thickness of the current collector of the battery plate; 16. A battery plate according to any one of claims 2 to 9 and 11 to 15.

17. The average thickness of the current collector of the battery plate is 50 μm or less; 17. A battery plate according to any one of claims 1 to 16.

18. Molten beads are formed in the first treatment region, and the diameter of the molten beads is 45 μm or less.

17. A battery plate according to any one of claims 2 to 9 and 11 to 16.

19. The three outer edges all have the second processing area. A battery plate according to any one of claims 1 to 18.

20. the tab has a first foil surface, a second foil surface, and a side surface extending along a thickness direction, and the second treated region includes a region extending along the first foil surface, a region extending along the second foil surface, and a region extending along the side surface; A battery plate according to any one of claims 1 to 19.

21. The thickness of the second treatment area is 1 to 3 times the thickness of the other areas in the blank foil area excluding the second treatment area.

21. A battery plate according to any one of claims 1 to 20.

22. The thickness of the second treatment area is 30 μm to 100 μm.

22. A battery plate according to any one of claims 1 to 21.

23. a third processing area is formed at an edge of an outer side of the paste application area, the third processing area being an inactive area; 23. A battery plate according to any one of claims 1 to 22.

24. The foil material of the battery plate is aluminum or copper; A battery plate according to any one of claims 1 to 23.

25. a battery plate including a pasted area and a tab; the tab includes a pasted transition area and a blank foil area, the pasted area includes a current collector and an active material layer located on the current collector, and the pasted transition area has an active material layer connected to the pasted area; a first treated region is formed at the edge of a side of the coating transition region, the thickness of the current collector in the first treated region is equal to or greater than the thickness of the current collector in the other region of the coating transition region excluding the first treated region, and the width of the first treated region gradually increases along the direction from the coating transition region to the blank foil region; A battery plate characterized by:

26. A battery plate comprising the battery plate according to any one of claims 1 to 25. A cell characterized by:

27. 27. A cell comprising the cell of claim 26. A battery characterized by:

Images