Polar Plate and Battery

Abstract

The present application provides a current collector plate and a battery. The current collector plate according to the present application includes a current collector, an active layer, and a first insulating layer including a first insulating main body portion and a first extending portion. In a first direction of the current collector plate, any surface of the current collector includes a first functional region and a second functional region connected to each other. The active layer covers the first functional region, and the first insulating main body portion covers the second functional region. In a second direction of the current collector plate, the first extending portion extends starting from at least a part of an end surface of the first insulating main body portion and protrudes from the second functional region. The second direction and the first direction are perpendicular to each other. The current collector plate according to the present application can improve the safety performance of the battery.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of new energy technologies, and in particular, to electrode plates and batteries.

Background Art

[0002] Currently, lithium-ion batteries are usually manufactured by a winding process or a lamination process. In the winding process or the lamination process, an electrode plate is usually cut using a metal cutter. However, burrs are likely to occur on the edges of the current collector of the electrode plate cut using the metal cutter. During battery manufacturing, the burrs are likely to pierce the separator, causing short circuits or even ignition of the battery.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of this, the embodiments of the present application provide an electrode plate. The first insulating layer in the electrode plate has a first extension portion protruding from the current collector. During battery manufacturing, the first extension portion pre-secures a space at the edge of the current collector, protects the edge of the current collector from damage, or prevents contact between the edge of the current collector and other members (separator), thereby improving the safety of the electrode plate.

[0004] The present application provides a battery. Since the battery includes the above-mentioned electrode plate, it has excellent safety.

Means for Solving the Problems

[0005] The present application provides an electrode plate including a current collector, an active layer, and a first insulating layer including a first insulating main body portion and a first extension portion. In a first direction of the electrode plate, any surface of the current collector includes a first functional region and a second functional region connected to each other. The active layer covers the first functional region, and the first insulating main body portion covers the second functional region. In the second direction of the electrode plate, the first extension portion extends starting from at least a part of the end face of the first insulating body portion and protrudes from the second functional region, and the second direction and the first direction are perpendicular to each other.

[0006] According to the electrode plate described above, it further includes a second insulating layer, and at least a part of the second insulating layer is provided on at least a part of the surface of the current collector of the active layer that is away from the current collector.

[0007] According to the electrode plate described above, the second insulating layer includes a second insulating body portion and a second extension portion. The second insulating body portion covers the active layer, and the second extension portion extends starting from at least a part of the end face of the second insulating body portion and protrudes from the current collector.

[0008] According to the electrode plate described above, in the second direction, the size of each of the first extension portions is 5 to 100 μm.

[0009] According to the electrode plate described above, in the second direction, the size of each of the second extension portions is 5 to 100 μm.

[0010] According to the electrode plate described above, the first extension portion covers at least a part of the end face of the current collector.

[0011] According to the electrode plate described above, the first insulating layer is provided on both surfaces of the current collector, and the first extension portions of the two first insulating layers are connected to each other.

[0012] According to the electrode plate described above, the second extension portion covers at least a part of the end face of the active layer and / or the current collector.

[0013] According to the electrode plate described above, active layers are provided on both surfaces of the current collector, and the second insulating layer is provided on the surfaces of the active layers on both surfaces that are away from the current collector. The second extending portions of the two second insulating layers are connected to each other.

[0014] According to the electrode plate described above, in the second direction, at least a part of the end face of the current collector has a melt bead.

[0015] According to the electrode plate described above, the particle diameter of the melt bead is 10 to 20 μm.

[0016] According to the electrode plate described above, the surface of the current collector further includes an electrode tab region for arranging an electrode tab. In the first direction, the electrode tab region is connected to the second functional region.

[0017] According to the electrode plate described above, the second edge of the first insulating body portion extending in the second direction has the same size as the first edge of the active layer extending in the second direction, and the second edge overlaps with the first edge. The fourth edge of the first insulating body portion extending in the second direction has the same size as the third edge of the electrode tab extending in the second direction, and the fourth edge overlaps with the third edge.

[0018] According to the electrode plate described above, the size of the second edge of the first insulating body portion extending in the second direction is smaller than the size of the first edge of the active layer extending in the second direction, and the second edge overlaps with the first edge. The fourth edge of the first insulating body portion extending in the second direction has the same size as the third edge of the electrode tab extending in the second direction, and the fourth edge overlaps with the third edge.

[0019] The present application provides a battery including the electrode plate described above.

Advantages of the Invention

[0020] This application provides an electrode plate. The first insulating layer in the electrode plate has a first extension portion protruding from the current collector. During battery manufacturing, the first extension portion pre - secures a space at the edge of the current collector, preventing contact between the edge of the current collector and other members, and improving the safety of the electrode plate.

[0021] This application provides a battery. Since the battery includes the electrode plate described above, it has excellent safety performance.

Brief Description of the Drawings

[0022] To more clearly illustrate the embodiments of this application or the solutions of the prior art, the drawings necessary for use in the description of the embodiments or the prior art will be briefly described below. Of course, the drawings described below are some embodiments of this application, and those skilled in the art can conceive of other drawings based on these drawings without creative effort.

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Embodiments for Carrying Out the Invention

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, hereinafter, with reference to the drawings related to the embodiments of the present application, the technical solutions will be clearly and completely described. Naturally, the described embodiments are only a part of the embodiments of the present application and not all of them. Those skilled in the art can obtain all other embodiments without creative labor based on the embodiments in the present application, and all of them belong to the protection scope of the present application.

[0024] FIG. 1 is a schematic structural diagram of an electrode plate in the first embodiment of the present application. As shown in FIG. 1, the present application provides an electrode plate including a current collector, an active layer 1, and a first insulating layer 2 including a first insulating main body portion 21 and a first extending portion 22. In the first direction of the electrode plate, any surface of the current collector includes a first functional region and a second functional region connected to each other. The active layer 1 covers the first functional region, and the first insulating main body portion 21 covers the second functional region. In the second direction of the electrode plate, the first extending portion 22 extends starting from at least a part of the end face of the first insulating main body portion 21 and protrudes from the second functional region. The second direction and the first direction are perpendicular to each other.

[0025] The electrode plate in the present application may be a positive electrode plate or a negative electrode plate. When the electrode plate is a positive electrode plate, the current collector is a positive current collector, and the active layer 1 is a positive active layer. When the electrode plate is a negative electrode plate, the current collector is a negative current collector, and the active layer 1 is a negative active layer.

[0026] In the present application, if the first direction and the second direction are perpendicular to each other, the first direction and the second direction of the electrode plate are not particularly limited. In some embodiments, when the first direction is the length direction of the electrode plate, the second direction is the width direction of the electrode plate; when the first direction is the width direction of the electrode plate, the second direction is the length direction of the electrode plate. Hereinafter, taking the case where the first direction is the width direction of the electrode plate and the second direction is the length direction of the electrode plate as an example, the technical solution according to the present application will be exemplarily described.

[0027] In the present application, the surface of the current collector refers to the two surfaces of the current collector that have the largest area and are arranged opposite to each other. In the first direction, one surface of the current collector of the present application includes a first functional region and a second functional region connected to each other, and it should be understood that both of the two surfaces of the current collector of the present application can include a first functional region and a second functional region connected to each other. Hereinafter, an exemplary description will be given with reference to one surface of the current collector.

[0028] In the present application, the fact that the active layer 1 covers the first functional region means that the orthographic projection of the active layer 1 in the first functional region completely overlaps with the first functional region, and the fact that the first insulating main body 21 covers the second functional region means that the orthographic projection of the first insulating main body 21 in the second functional region completely overlaps with the second functional region. In the first direction, it should be understood that the first insulating main body 21 and the active layer 1 are connected to each other. The present application does not limit the connection manner between the active layer 1 and the first insulating main body 21 as long as the first insulating main body 21 and the active layer 1 are connected to each other.

[0029] In the present application, the thickness of the first insulating main body 21 may be the same as or different from the thickness of the active layer 1.

[0030] In the present application, the active layer 1 is for ensuring normal lithium desorption and insertion of the electrode plate to achieve normal charge and discharge of the battery, and the first insulating main body 21 is for preventing the active layer 1 and / or the current collector from contacting the electrode plate with the opposite electric potential and causing a short circuit.

[0031] In the second direction, the first extension portion 22 may extend starting from the entire end face of the first insulating body portion 21 and protrude from the current collector, or the first extension portion 22 may extend starting from a part of the end face of the first insulating body portion 21 and protrude from the current collector. It should be understood that the present application does not particularly limit the number of the first extension portions 22, and there may be one or a plurality of the first extension portions 22.

[0032] In the present application, the first insulating layer 2 may be a ceramic insulating layer commonly used in the art, the first insulating body portion 21 may be composed of a conventional ceramic, and the first extension portion 22 may include at least one of alumina, boehmite, and graphite.

[0033] In the electrode plate of the present application, the first insulating layer 2 has a first extension portion 22 protruding from the current collector. During battery manufacturing, the first extension portion 22 secures a space in advance at the edge of the current collector, preventing the edge of the current collector from contacting other members and damaging other members, avoiding the occurrence of a battery short circuit due to damage to other members, and improving the safety of the battery.

[0034] In the present application, the electrode plate can be manufactured by a method including the following steps 1) to 3): 1) Using a conventional coating method, arrange the active slurry in the first functional area of the current collector and dry it to obtain the active layer 1. The conventional coating method includes at least one of roll coating, extrusion coating, and curtain coating. 2) Apply the ceramic slurry to one edge of the active layer 1 extending along the second direction and dry it to obtain the first insulating layer 2. 3) Cut the current collector provided with the first insulating layer 2 and the active layer 1 along the first direction using a laser to obtain the electrode plate of the present application.

[0035] During the cutting process, the laser beam is irradiated onto the surface of the current collector plate, and the generated energy vaporizes or melts the surface of the workpiece, thereby achieving the cutting process. At the same time, during the cutting process, the energy generated by the laser beam sinters the first insulating layer 2, thereby forming a current collector plate with a first extended portion 22.

[0036] Although the laser in this application is not particularly limited, the laser can include at least one of a nanosecond laser, a picosecond laser, and a femtosecond laser, but is not limited thereto.

[0037] FIG. 2 is a SEM diagram of the current collector plate in the first embodiment of this application, FIG. 3 is an energy spectrometer diagram of one current collector plate in the first embodiment of this application, and FIG. 4 is another energy spectrometer diagram of the current collector plate in the first embodiment of this application. From FIG. 2, it can be seen that the first insulating layer 2 of this application includes a first extended portion 22 protruding from the current collector and a first insulating main body portion 21. From FIGS. 3 and 4, it can be seen that in this application, a large amount of Al element is distributed in the portion of the first insulating layer 2 protruding from the current collector, which indicates that the first extended portion 22 contains alumina.

[0038] FIG. 5 is a schematic structural diagram of the current collector plate in the second embodiment of this application. As shown in FIG. 5, in some embodiments of this application, a second insulating layer 3 is further provided, and at least a part of the second insulating layer 3 is provided on at least a part of the surface of the active layer 1 away from the current collector.

[0039] It should be understood that at least a part of the second insulating layer 3 may be provided on any surface of the active layer 1 away from the current collector. In a specific embodiment, the second insulating layer 3 is provided close to the first insulating layer 2.

[0040] Furthermore, when the thickness of the first insulating layer 2 is greater than the thickness of the active layer 1, the second insulating layer 3 is connected to the first insulating layer 2.

[0041] It should be understood that the shape of the second insulating layer 3 may be regular or irregular.

[0042] In the present application, at least a part of the second insulating layer 3 is provided on at least a part of the surface of the active layer 1 away from the current collector, thereby better preventing the active layer 1 and / or the current collector from contacting the electrically opposite electrode plates to cause a short circuit, and improving the safety performance of the battery. In particular, when the thickness of the first insulating layer 2 is greater than the thickness of the active layer 1, when the second insulating layer 3 is connected to the first insulating layer 2, it is possible to prevent the generation of an air foil between the first insulating layer 2 and the active layer 1, thereby better preventing the active layer 1 and / or the current collector from contacting the electrically opposite electrode plates to cause a short circuit, and improving the safety performance of the battery.

[0043] As shown in FIG. 5, in some embodiments of the present application, the second insulating layer 3 includes a second insulating main body portion 31 and a second extending portion 32. The second insulating main body portion 31 covers the active layer 1, and the second extending portion 32 extends starting from at least a part of the end face of the second insulating main body portion 31 and protrudes from the current collector.

[0044] The edge extending along the first direction of the third orthographic projection on the surface of the active layer 1 of the second insulating main body portion 31 overlaps with the edge of the active layer 1 along the first direction. It should be understood that the second extending portion 32 is connected to the edge of the second insulating main body portion 31 extending along the first direction, and extends in a direction away from the current collector starting from the edge of the second insulating main body portion 31 extending along the first direction.

[0045] In the present application, the second insulating layer 3 may be a ceramic insulating layer commonly used in the art, the second insulating body portion 31 may be composed of a conventional ceramic, and the second extending portion 32 may include at least one of alumina, boehmite, and graphite. The first insulating layer 2 and the second insulating layer 3 may be of the same material or different materials, and the materials of the first extending portion 22 and the second extending portion 32 may be the same or different.

[0046] The electrode plate of the present application further includes a second insulating layer 3, and the second insulating layer 3 further has a second extending portion 32 protruding from the current collector. During battery manufacturing, the second extending portion 32 cooperates with the first extending portion 22 to pre - ensure a space at the edge of the current collector, prevent the edge of the current collector from contacting other members and damaging other members, thereby further avoiding the occurrence of a battery short - circuit due to damage to other members and improving the safety of the battery.

[0047] In some embodiments of the present application, in the second direction, the size of each first extending portion 22 is 5 - 100 μm, and / or in the second direction, the size of each second extending portion 32 is 5 - 100 μm.

[0048] It should be understood that in the present application, the first extending portion 22 and / or the second extending portion 32 may have a regular shape or an irregular shape. The size of the first extending portion 22 in the second direction refers to the maximum size extending in the direction away from the current collector of the first extending portion 22 starting from the edge of the first insulating body portion 21, and the size of the second extending portion 32 in the second direction refers to the maximum size extending in the direction away from the current collector of the second extending portion 32 starting from the edge of the second insulating body portion 31.

[0049] In the present application, when the size of any one of the first extending portion 22 and / or the second extending portion 32 in the second direction satisfies 5 - 100 μm, the volume energy density of the battery can be increased, and at the same time, a sufficient space can be pre - ensured at the edge of the current collector, and the safety performance of the battery can be improved.

[0050] In some embodiments of the present application, when the first extension portion 22 covers at least a part of the end face of the current collector, it can better protect the end face of the current collector, prevent the edge of the current collector from contacting other members and damaging other members, thereby further avoiding the occurrence of a short circuit of the battery due to damage to other members, and improving the safety of the battery.

[0051] In particular, when the first insulating layers 2 are provided on both surfaces of the current collector and the first extension portions 22 of the two first insulating layers 2 are connected to each other, the first extension portion 22 can completely cover the end face of the current collector in the thickness direction, and can better improve the safety of the battery.

[0052] In some embodiments of the present application, when the second extension portion 32 covers at least a part of the end face of the active layer 1 and / or the current collector, it can better protect the end face of the current collector, prevent the edge of the current collector from contacting other members and damaging other members, thereby further avoiding the occurrence of a short circuit of the battery due to damage to other members, and improving the safety of the battery.

[0053] In particular, when the active layers 1 are provided on both surfaces of the current collector, the second insulating layers 3 are provided on the surfaces of the active layers 1 on both surfaces away from the current collector, and the second extension portions 32 of the two second insulating layers 3 are connected to each other, the second extension portion 32 can completely cover the active layer 1 and the end face of the current collector in the thickness direction, and can better improve the safety of the battery.

[0054] FIG. 6 is an SEM diagram of the electrode plate in the 3 first type of embodiment of the present application. As shown in FIG. 6, in some embodiments of the present application, in the second direction, at least a part of the end face of the current collector has spherical and / or quasi-spherical melt beads 5.

[0055] In the present application, in the second direction, at least a part of the end face of the current collector has spherical and / or quasi-spherical melt beads 5. Therefore, even if the current collector comes into contact with other members, it will not pierce other members, and the safety performance of the battery can be further improved.

[0056] During the cutting process, the laser beam is irradiated onto the surface of the electrode plate, and the generated energy vaporizes or melts the surface of the workpiece, thereby achieving the cutting process. At the same time, it should be understood that during the cutting process, the energy generated by the laser beam melts the end face of the current collector to form the melt beads 5.

[0057] It can be seen from FIG. 6 that in some embodiments of the present application, the particle size of the melt beads 5 is 10-20 μm.

[0058] In the present application, the particle size of the melt beads 5 refers to the average diameter of the melt beads. When the particle size of spherical particles and / or quasi-spherical particles is 10-20 μm, energy consumption can be saved, and at the same time, the safety performance of the battery can be further improved.

[0059] FIG. 7 is a schematic structural diagram of the electrode plate in the fourth embodiment of the present application, and FIG. 8 is an SEM diagram of the electrode plate in the fourth embodiment of the present application. As shown in FIG. 7 or 8, in some embodiments of the present application, the surface of the current collector further includes an electrode tab region 4 for arranging the electrode tab. In the first direction, the electrode tab region 4 is connected to the second functional region.

[0060] In the present application, it should be understood that in the first direction, the surface of the current collector includes a first functional region, a second functional region connected to each other, and an electrode tab region 4 for arranging an electrode tab connected to an external circuit.

[0061] The present application does not particularly limit the sizes of the electrode tab, the first insulating body portion 21, and the active layer 1. In some embodiments, the second edge of the first insulating body portion 21 extending in the second direction has the same size as the first edge of the active layer 1 extending in the second direction, and the second edge overlaps with the first edge. The fourth edge of the first insulating body portion 21 extending in the second direction has the same size as the third edge of the electrode tab extending in the second direction, and the fourth edge overlaps with the third edge.

[0062] In the present application, the first insulating body portion 21 may be regular or irregular. Among the two opposite sides of the first insulating body portion 21 that extend in the second direction, one side has the same size as the active layer 1, and the other side has the same size as the electrode tab. It should be understood that in the second direction, the end face of the electrode tab further has a first extension portion 22, and in the first direction, the edge of the first insulating body portion 21 also has the first extension portion 22.

[0063] In some embodiments of the present application, the size of the second edge of the first insulating body portion 21 extending in the second direction is smaller than the size of the first edge of the active layer 1 extending in the second direction, and the second edge overlaps with the first edge. The fourth edge of the first insulating body portion 21 extending in the second direction has the same size as the third edge of the electrode tab extending in the second direction, and the fourth edge overlaps with the third edge.

[0064] It should be understood that among the two opposite sides of the first insulating body portion 21 that extend in the second direction, one side is smaller in size than the active layer 1, and the other side has the same size as the electrode tab. It should be understood that in the second direction, the end face of the electrode tab further has a first extension portion 22, and in the first direction, the edge of the first insulating body portion 21 also has the first extension portion 22.

[0065] In the present application, the first insulating layer 2 is cut along a second direction using a laser, and the first insulating layer 2 and the electrode tab region are cut along an arbitrary direction having an angle with the second direction, and the above-described electrode plate can be obtained by the method of forming the above-described electrode plate. Along the cutting path of the laser, there is a first extension portion 22 protruding from the second functional region at the edge of the first insulating layer 2, and the first extension portion 22 can better improve the safety performance of the electrode plate. In particular, since the first extension portion 22 also exists around the electrode tab, the electrode tab can be better protected and the safety performance of the electrode plate can be improved.

[0066] The size of the edge of the first insulating main body portion 21 adjacent to the active layer 1 can be adjusted by controlling the position where the laser cutting start point is located. For example, in the first direction, when the size from the cutting start point to the edge of the first insulating layer 2 close to the active layer is zero, the edge of the first insulating main body portion 21 adjacent to the active layer 1 size is the active layer 1 near the edge closer to the first insulating layer 2 of size than is small, and in the first direction, when the size from the cutting start point to the edge of the first insulating layer 2 close to the active layer 1 is larger than zero, the edge of the first insulating main body portion 21 adjacent to the active layer 1 size is the active layer 1 near the edge closer to the first insulating layer 2 of size and is the same.

[0067] In the present application, when the size of the edge of the first insulating main body portion 21 adjacent to the active layer 1 is smaller than the size of the active layer 1, the mass energy density of the battery can be increased while improving the safety performance of the battery.

[0068] FIG. 9 is an SEM diagram of the electrode tab of the electrode plate viewed from the first type of view of the present application, and FIG. 10 is an SEM diagram of the electrode tab of the electrode plate viewed from the second type of view of the present application. From FIG. 9 or FIG. 10, it can be seen that the electrode plate includes a first insulating layer 2, a second insulating layer 3, and an active layer 1. In the first direction of the electrode plate, the active layer 1 and the first insulating layer 2 connected to each other are sequentially provided. The second insulating layer 3 is provided close to the first insulating layer 2 and covers a part of the surface of the active layer 1. The size of the second edge of the first insulating body portion 21 of the first insulating layer 2 extending in the second direction is smaller than the size of the first edge of the active layer 1 extending in the second direction, and the second edge overlaps with the first edge.

[0069] In a second aspect, the present application provides a battery comprising the electrode plate described above.

[0070] Since the battery according to the present application includes the electrode plate described above, the positive electrode plate and the negative electrode plate are less likely to come into contact and cause a short circuit, and it has excellent safety performance.

[0071] It should be noted that the numerical values and numerical ranges related to the description of the present application are approximate values, and there may be errors within a certain range due to the influence of the manufacturing process and measurement accuracy. However, it can be considered that those skilled in the art can ignore the errors in this part.

[0072] In the description of the present application, the orientation or positional relationship indicated by terms such as "top", "bottom", "upper", "lower" (if any) used is based on the orientation or positional relationship shown in the drawings, and is only intended to facilitate the description of the present application and simplify the description, and is not intended to indicate or imply that the shown device or element must be in a specific orientation, constructed in a specific structure, and operate. Therefore, it should be understood that it cannot be understood as limiting the present application.

[0073] In the description of this application, it should be noted that the terms "attachment", "connection", and "coupling" are to be understood in a broad sense unless explicitly specified and limited. For example, it may be a fixed connection, a detachable connection, or an integral connection, and it may be a mechanical connection or an electrical connection, a direct connection or an indirect connection via an intermediate medium, or a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific situation.

[0074] Finally, it should be noted that each of the above embodiments is for explaining the technical solution of this application and does not limit it. Although this application is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or perform equivalent substitutions for some or all of their technical features. It should be understood that these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of each embodiment of this application.

[0075] This application claims the priority of a Chinese patent application with an application number of 202222475302.7 and an invention title of "Pole Plate and Battery", which was filed with the Chinese Patent Office on September 19, 2022, and all of its contents are incorporated into this application by reference.

Description of Reference Numerals

[0076] 1. Active layer 2. First insulating layer 3. Second insulating layer 4. Electrode tab area 5. Melt bead 21. First insulating main body part 22. First extension part 31. Second insulating main body part 32. Second extension part

Claims

1. An electrode plate comprising a current collector, an active layer, and a first insulating layer including a first insulating main body portion and a first extending portion, wherein in a first direction of the electrode plate, one surface of the current collector includes a first functional region and a second functional region connected to each other, the active layer covers the first functional region, and the first insulating main body portion covers the second functional region; in a second direction of the electrode plate, the first extending portion extends starting from at least a part of an end surface of the first insulating main body portion and protrudes from the second functional region, and the second direction and the first direction are perpendicular to each other.

2. The electrode plate according to claim 1, further comprising a second insulating layer, at least a part of which is provided on at least a part of a surface of the active layer away from the current collector.

3. The second insulating layer includes a second insulating main body portion and a second extending portion, the second insulating main body portion covers the active layer, and the second extending portion extends starting from at least a part of an end surface of the second insulating main body portion and protrudes from the current collector.

4. In the second direction, the size of each of the first extending portions is 5 to 100 μm, and / or in the second direction, the size of each of the second extending portions is 5 to 100 μm.

5. The electrode plate according to any one of claims 1 to 4, wherein the first extending portion covers at least a part of an end surface of the current collector.

6. The first insulating layers are provided on both surfaces of the current collector, and the first extending portions of the two first insulating layers are connected to each other.

7. The electrode plate according to claim 3 or 4, wherein the second extending portion covers at least a part of an end surface of the active layer and / or the current collector.

8. Active layers are provided on both surfaces of the current collector, second insulating layers are provided on surfaces of the active layers on both surfaces away from the current collector, and the second extending portions of the two second insulating layers are connected to each other.

9. In the second direction, at least a part of an end surface of the current collector has a melt bead.

10. The electrode plate according to claim 9, wherein the particle diameter of the melt bead is 10 to 20 μm.

11. The surface of the current collector further includes an electrode tab region for arranging the electrode tab. In the first direction, the electrode tab region is connected to the second functional region. The electrode plate according to any one of claims 1 to 10.

12. The second edge of the first insulating body portion extending in the second direction has the same size as the first edge of the active layer extending in the second direction, and the second edge overlaps with the first edge. The fourth edge of the first insulating body portion extending in the second direction has the same size as the third edge of the electrode tab extending in the second direction, and the fourth edge overlaps with the third edge. The electrode plate according to claim 11.

13. The size of the second edge of the first insulating body portion extending in the second direction is smaller than the size of the first edge of the active layer extending in the second direction, and the second edge overlaps with the first edge. The fourth edge of the first insulating body portion extending in the second direction has the same size as the third edge of the electrode tab extending in the second direction, and the fourth edge overlaps with the third edge. The electrode plate according to claim 11.

14. A battery including the electrode plate according to any one of claims 1 to 13.

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