Pole piece of solid-state battery, solid-state battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a pole piece of a solid-state battery, the solid-state battery and electric equipment. The pole piece of the solid-state battery comprises a current collector, and the current collector comprises a first side edge and a second side edge which are oppositely arranged; the active coating is located on the surface of the current collector and comprises a first part and a second part, the first part is located in the middle of the current collector, and the second part is located on the first side edge and the second side edge; the surface of the second part protrudes out of the surface of the first part; and a limiting space is formed between the second parts of the first side edge and the second side edge. By applying the technical scheme of the invention, the problem that the solid-state battery is easy to short-circuit in the related technology can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to an electrode sheet of a solid-state battery, a solid-state battery, and an electrical device. Background Art

[0002] A solid-state battery is an advanced battery technology that uses solid electrodes and a solid electrolyte to replace the liquid electrolyte in a traditional lithium-ion battery. This technology is considered to have higher safety, longer cycle life, and higher energy density, and is therefore highly anticipated as the next-generation battery technology.

[0003] The difference between a solid-state battery and the currently produced liquid battery core is that a separator is not required. The core directly achieves good mechanical contact between the positive electrode sheet and the negative electrode sheet and the solid electrolyte membrane through heating and compression.

[0004] Due to the lack of a separator, the positive and negative electrode sheets may be misaligned during handling and assembly after lamination of the electrode sheets, resulting in short-circuiting between the positive and negative electrodes and posing a safety risk. Summary of the Utility Model

[0005] The present application provides an electrode sheet of a solid-state battery, a solid-state battery, and an electrical device to solve the problem of easy short-circuiting of solid-state batteries in related technologies.

[0006] On the one hand, the present application provides an electrode sheet of a solid-state battery, including: a current collector, the current collector including a first side and a second side arranged opposite to each other; an active coating, the active coating being located on the surface of the current collector, the active coating including a first part and a second part, the first part being located in the middle of the current collector, the second part being located on the first side and the second side; the surface of the second part protrudes from the surface of the first part; a limiting space is formed between the second parts located on the first side and the second side.

[0007] In some embodiments, the current collector includes a first surface and a second surface arranged opposite to each other in its thickness direction, the active coating includes a first active coating coated on the first surface of the current collector, the first active coating includes a first part and a second part, the first part being located in the middle of the current collector, the second part being located on the first side and the second side; the surface of the second part protrudes from the surface of the first part; a first limiting space is formed between the second parts located on the first side and the second side.

[0008] In some embodiments, the active coating includes a second active coating coated on the second surface of the current collector, the second active coating includes a first part and a second part, the first part being located in the middle of the current collector, the second part being located on the second side and the second side; the surface of the second part protrudes from the surface of the first part; a second limiting space is formed between the second parts located on the second side and the second side.

[0009] In some embodiments, along the thickness direction of the electrode tab, the first part of the first active coating faces the first part of the second active coating, and the second part of the first active coating faces the second part of the second active coating.

[0010] In some embodiments, the second part is coated with an insulating layer.

[0011] In some embodiments, the width D of the second part located on the first side is between 1 mm and 3 mm; and / or, the width D of the second part located on the second side is between 1 mm and 3 mm.

[0012] In some embodiments, the second part is provided with a roller pressing texture structure on the surface in the thickness direction of the electrode tab.

[0013] On the other hand, the present application provides a solid-state battery, including: a positive electrode tab and a negative electrode tab, both the positive electrode tab and the negative electrode tab being the above-mentioned electrode tabs; the positive electrode tab and the negative electrode tab are stacked in the thickness direction of the solid-state battery, the positive electrode tab is limited within the limiting space of the negative electrode tab, and the negative electrode tab is limited within the limiting space of the positive electrode tab.

[0014] In some embodiments, the size h by which the second part protrudes from the surface of the first part, and the thickness H of the first part of the negative electrode tab satisfy: h ≤ 1 / 2H.

[0015] In some embodiments, the positive electrode tab includes a positive electrode lug, and the positive electrode lug is located between the first side and the second side; the negative electrode tab includes a negative electrode lug, and the negative electrode lug protrudes from the edge of the second part away from the first part, and the negative electrode lug is located between the first side and the second side of the positive electrode tab.

[0016] In some embodiments, the positive electrode tab includes a positive electrode lug, and the positive electrode lug protrudes from the edge of the second part away from the first part; the negative electrode tab includes a negative electrode lug, and the negative electrode lug protrudes from the edge of the second part away from the first part, and the negative electrode lug is located between the first side and the second side of the positive electrode tab.

[0017] In some embodiments, the solid-state battery further includes a protective film, the protective film wraps around the circumferential outer sides of the positive electrode tab and the negative electrode tab, and the positive electrode lug and the negative electrode lug are exposed outside the protective film.

[0018] In some embodiments, the protective film includes a first film layer covering the positive electrode tab, and the surface of the first film layer facing the positive electrode tab is provided with a first boss structure, and the first boss structure extends into the limiting space and is in contact and cooperation with the first part; and / or, the protective film includes a second film layer covering the negative electrode tab, and the surface of the second film layer facing the negative electrode tab is provided with a second boss structure, and the second boss structure extends into the limiting space and is in contact and cooperation with the first part.

[0019] On the other hand, the present application provides an electrical device including the above-mentioned solid-state battery.

[0020] The electrode provided by this application forms a limiting space on the active coating. After the electrodes are stacked, the limiting space of the upper electrode can limit the lower electrode, and at the same time, the limiting space of the lower electrode can also limit the upper electrode. That is to say, the two second parts located on the first side and the second side can play a blocking effect on the adjacent electrodes, so that the stacked electrodes can limit each other, thereby reducing the probability of the electrodes in the upper and lower layers moving relative to each other, and further reducing the risk of short circuit of the electrodes. Description of the Drawings

[0021] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0022] Figure 1 Schematic structural diagram of the electrode of the solid-state battery provided by the embodiment of this application;

[0023] Figure 2 Schematic three-dimensional structural diagram of the solid-state battery provided by the embodiment of this application;

[0024] Figure 3 Side view of the solid-state battery provided by the embodiment of this application;

[0025] Figure 4 Schematic three-dimensional structural diagram of the positive electrode of the solid-state battery provided by an embodiment of this application;

[0026] Figure 5 Top view of the positive electrode of the solid-state battery provided by the embodiment of this application;

[0027] Figure 6 Side view of the positive electrode of the solid-state battery provided by the embodiment of this application;

[0028] Figure 7 For Figure 6 Enlarged view of part A of the positive electrode;

[0029] Figure 8 Top view of the positive electrode of the solid-state battery provided by another embodiment of this application;

[0030] Figure 9 Schematic three-dimensional structural diagram of the negative electrode of the solid-state battery provided by the embodiment of this application;

[0031] Figure 10 Top view of the negative electrode of the solid-state battery provided by the embodiment of this application;

[0032] Figure 11 Side view of the negative electrode of the solid-state battery provided by the embodiment of this application;

[0033] Figure 12 is Figure 11 An enlarged view of location B on the negative electrode sheet;

[0034] Figure 13 is a schematic three - dimensional structure diagram of the positive electrode sheet and the negative electrode sheet of the solid - state battery provided by the embodiment of the present application;

[0035] Figure 14 is a schematic structure diagram of the protective film of the solid - state battery provided by an embodiment of the present application;

[0036] Figure 15 is a schematic structure diagram of the protective film of the solid - state battery provided by another embodiment of the present application.

[0037] Explanation of reference numerals:

[0038] 10. Electrode sheet; 11. Positive electrode sheet; 12. Negative electrode sheet;

[0039] 20. Solid - state battery;

[0040] 100. Current collector; 110. Positive electrode tab; 120. Negative electrode tab;

[0041] 200. Active coating; 201. First part; 202. Second part; 203. Limiting space;

[0042] 210. First active coating; 211. First limiting space;

[0043] 220. Second active coating; 221. Second limiting space;

[0044] 300. Protective film; 310. First film layer; 311. First boss structure; 320. Second film layer; 321. Second boss structure. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0046] In the related art, after the liquid battery is stacked, a separator is used to wind the entire electrode core, and then adhesive tape is pasted on the separator to fix the entire electrode core and prevent the electrode sheets from being misaligned.

[0047] The difference between a solid-state battery and the current liquid battery cores is that the solid-state battery does not require the use of a separator. The battery core of the solid-state battery directly realizes good mechanical contact between the positive electrode sheet and the negative electrode sheet and the solid electrolyte membrane through heating and compression. Due to the lack of a separator, the positive electrode sheet and the negative electrode sheet are prone to dislocation after lamination, resulting in a safety risk of short circuit between the positive and negative electrodes.

[0048] In view of this, the present application provides a pole piece for a solid-state battery, which limits the adjacent pole piece by forming a limiting space on the pole piece, so as to reduce the probability of mutual movement between two adjacent pole pieces after the battery core is laminated, and further reduce the risk of short circuit of the positive and negative electrode sheets 12.

[0049] The following describes the specific structure of the pole piece of the solid-state battery with reference to the drawings.

[0050] As Figure 1 and Figure 2 shown, the embodiment of the present application provides a pole piece for a solid-state battery, and the pole piece includes: a current collector 100 and an active coating 200.

[0051] Among them, the current collector 100 includes a first side and a second side arranged opposite to each other;

[0052] The active coating 200 is located on the surface of the current collector 100. The active coating 200 includes a first part 201 and a second part 202. The first part 201 is located in the middle of the current collector 100, and the second part 202 is located on the first side and the second side; the surface of the second part 202 protrudes from the surface of the first part 201; a limiting space 203 is formed between the second parts 202 located on the first side and the second side.

[0053] Applying the technical solution of this embodiment, the limiting space 203 is formed on the active coating 200. When the pole pieces are laminated, the limiting space of the upper pole piece can limit the lower pole piece, and at the same time, the limiting space of the lower pole piece can also limit the upper pole piece. That is to say, the two second parts 202 located on the first side and the second side respectively can play a blocking effect on the adjacent pole pieces, so that the mutually laminated pole pieces can limit each other, thereby reducing the probability of movement between the upper and lower layers of pole pieces, and further reducing the risk of pole piece short circuit.

[0054] Exemplarily, as Figure 13As shown, the upper electrode sheet can be the positive electrode sheet 11, and the lower electrode sheet can be the negative electrode sheet 12. Both the positive electrode sheet 11 and the negative electrode sheet 12 have a limiting space. After the positive electrode sheet 11 and the negative electrode sheet 12 are laminated, the negative electrode sheet 12 can be limited within the limiting space of the positive electrode sheet 11. At the same time, the positive electrode sheet 11 can also be limited within the limiting space of the negative electrode sheet 12, so that the mutually laminated positive electrode sheet 11 and negative electrode sheet 12 can limit each other, thereby reducing the risk of short circuit between the positive electrode sheet 11 and the negative electrode sheet 12.

[0055] It should be noted that the positive electrode active coating of the positive electrode sheet 11 includes high-nickel ternary and lithium-rich manganese-based materials, and the positive electrode current collector can be aluminum foil. The negative electrode active coating of the negative electrode sheet 12 can include components such as silicon-carbon, and the negative electrode current collector is copper foil.

[0056] In some embodiments, the active coating 200 can be coated on the current collector 100 in a single layer. Specifically, on the first surface and the second surface of the current collector 100 that are oppositely arranged in its thickness direction, the active coating 200 includes a first active coating 210 coated on the first surface of the current collector 100. The first active coating 210 includes a first part 201 and a second part 202. The first part 201 is located in the middle of the current collector 100, and the second part 202 is located on the first side and the second side. The surface of the second part 202 protrudes from the surface of the first part 201, so that a first limiting space 211 is formed between the second parts 202 located on the first side and the second side.

[0057] Exemplarily, after the positive electrode sheet 11 and the negative electrode sheet 12 are laminated, the first limiting space 211 of the positive electrode sheet 11 can limit the negative electrode sheet 12, and the first limiting space 211 of the negative electrode sheet 12 can limit the positive electrode sheet 11, thereby reducing the probability of the positive electrode sheet 11 and the negative electrode sheet 12 moving out of place.

[0058] In some embodiments, the active coating 200 can be coated on the current collector 100 in a double layer. Specifically, the active coating 200 includes a first active coating 210 coated on the first surface of the current collector 100 and a second active coating 220 coated on the second surface of the current collector 100.

[0059] The first active coating 210 includes a first part 201 and a second part 202. The first part 201 is located in the middle of the current collector 100, and the second part 202 is located on the first side and the second side. The surface of the second part 202 protrudes from the surface of the first part 201, so that a first limiting space 211 is formed between the second parts 202 located on the first side and the second side. The second active coating 220 includes a first part 201 and a second part 202. The first part 201 is located in the middle of the current collector 100, and the second part 202 is located on the second side and the second side; the surface of the second part 202 protrudes from the surface of the first part 201, so that a second limiting space 221 is formed between the second parts 202 located on the second side and the second side.

[0060] In the above structure, when both the positive electrode sheet 11 and the negative electrode sheet 12 include multiple sheets, the positive electrode sheet 11 and the negative electrode sheet 12 are arranged alternately in the thickness direction of the solid-state battery. Exemplarily, the first limiting space 211 of the positive electrode sheet 11 is used to limit the negative electrode sheet 12 above the positive electrode sheet 11, and the second limiting space 221 of the positive electrode sheet 11 is used to limit the negative electrode sheet 12 below the positive electrode sheet 11. Correspondingly, the first limiting space 211 of the negative electrode sheet 12 is used to limit the positive electrode sheet 11 above the negative electrode sheet 12, and the second limiting space 221 of the negative electrode sheet 12 is used to limit the positive electrode sheet 11 below the negative electrode sheet 12. This setting method enables each adjacent two layers of electrode sheets to limit each other after the solid-state battery is laminated, so that the multi-layer electrode sheets present a more stable and fastened state. After the solid-state battery is pressed by pressure, a tight whole can be formed, thereby enhancing the mechanical performance of the solid-state battery and enabling the edge of the electrode core to withstand the impact force of dropping and extrusion.

[0061] The manufacturing process of the electrode sheet is to uniformly coat the active material on the current collector 100 and then dry it. The dried electrode sheet is roll-pressed to form a predetermined thickness and a predetermined shape.

[0062] In the solid-state battery, it is also necessary to stir and coat electrolyte slurries such as sulfides on the prepared electrode sheets, and through processes such as drying and calendering, a positive electrode / sulfide electrolyte thin-layer material with good solid-solid interface contact is prepared. Finally, the electrode sheets are cut according to the designed size by a cutting knife.

[0063] It should be noted that the first part 201 on the electrode sheet is actually formed after the active coating 200 is roll-pressed. The thickness of the first part 201 is smaller than the thickness of the second part 202. When roll-pressing, the upper and lower rollers with a convex middle and concave sides can be used to roll-press the electrode sheet to realize the roll-pressing of the first active coating 210 and the second active coating 220, thereby forming the first limiting space 211 and the second limiting space 221.

[0064] It should also be noted that, in order to improve the processing consistency of the positive electrode sheet 11 and the negative electrode sheet 12, in the thickness direction of the electrode sheet, the first parts 201 of the first active coating 210 and the second active coating 220 can be made to face each other, and the second parts 202 of the first active coating 210 and the second active coating 220 can be made to face each other. In this way, the multiple positive electrode sheets 11 of the solid-state battery cell can have a unified size, and correspondingly, the multiple negative electrode sheets 12 of the solid-state battery cell can also have a unified size.

[0065] On the other hand, as Figures 2 to 14 shown, the present application provides a solid-state battery, including: a positive electrode sheet 11 and a negative electrode sheet 12, the positive electrode sheet 11 and the negative electrode sheet 12 are stacked in the thickness direction of the solid-state battery, the positive electrode sheet 11 is limited in the limiting space of the negative electrode sheet 12, and the negative electrode sheet 12 is limited in the limiting space of the positive electrode sheet 11.

[0066] Specifically, as Figures 4 to 7 and Figure 13 shown, the two second parts 202 of the positive electrode sheet 11 can be arranged opposite to each other along a first direction (such as the y direction shown in Figure 4 ), the first part 201 of the negative electrode sheet 12 can be attached to the first part 201 of the positive electrode sheet 11, and the two edges of the negative electrode sheet 12 in the first direction are limited between the two first parts 201 of the positive electrode sheet 11. When the negative electrode sheet 12 has a tendency to move in the first direction, the two second parts 202 on the positive electrode sheet 11 can form a stop for the edges of the negative electrode sheet 12, so as to reduce the probability of movement between the negative electrode sheet 12 and the positive electrode sheet 11.

[0067] Correspondingly, as Figures 8 to 13 shown, the two second parts 202 of the negative electrode sheet 12 can be arranged opposite to each other along a second direction (such as the x direction shown in Figure 4 ), the first part 201 of the positive electrode sheet 11 is attached to the first part 201 of the negative electrode sheet 12, and the two edges of the positive electrode sheet 11 in the second direction are limited between the two second parts 202 of the negative electrode sheet 12. When the positive electrode sheet 11 has a tendency to move in the second direction, the two second parts 202 on the negative electrode sheet 12 can form a stop for the edges of the positive electrode sheet 11, so as to reduce the probability of movement between the negative electrode sheet 12 and the positive electrode sheet 11.

[0068] The above setting method enables the adjacent two electrode sheets to form mutual limitation in the first direction and the second direction, so that the stacked solid battery presents a more stable structure. It can also increase the resistance of the solid battery cell to dropping and extrusion.

[0069] It should be noted that the second part 202 is coated with an insulating layer to prevent the second part 202 from directly contacting the electrode tab of the electrode sheet and causing a short circuit between the positive and negative electrode sheets 12.

[0070] Since the insulating layer is coated on the second part 202, the active coating 200 covered by the insulating layer will not be able to function, affecting the capacity of the battery. If the width D of the second part 202 is set too large, the limiting effect on the adjacent electrode sheets will be affected. Therefore, the width D of the second part 202 on the first side can be between 1 mm and 3 mm, and the width D of the second part 202 on the second side can be between 1 mm and 3 mm. This setting method can ensure the limiting effect of the second part 202 while also ensuring the capacity of the battery.

[0071] In addition, the distance between the two second parts 202 of the positive electrode sheet 11 should be slightly larger than the size of the negative electrode sheet 12 in the y direction to accommodate the assembly error when the positive and negative electrode sheets 12 are laminated. Exemplarily, the distance between the two second parts 202 of the positive electrode sheet 11 can be 1 mm larger than the size of the negative electrode sheet 12 in the y direction.

[0072] Correspondingly, the distance between the two second parts 202 of the negative electrode sheet 12 should be slightly larger than the size of the entire electrode sheet in the x direction to accommodate the assembly error when the positive and negative electrode sheets 12 are laminated. Exemplarily, the distance between the two second parts 202 of the negative electrode sheet 12 can be 1 mm larger than the size of the entire electrode sheet in the x direction.

[0073] In some embodiments, a roll-pressed embossing structure can also be provided on the second part 202. Specifically, the roll-pressed embossing structure is provided on the surface in the thickness direction of the electrode sheet. In order to ensure a reduction in the solid-solid interface impedance of the solid-state battery, a pressure of 10 Mpa needs to be applied to the solid-state battery. The roll-pressed embossing structure on the second part 202 can further reduce the height of the second step.

[0074] Exemplarily, the depth of the roll-pressed embossing structure can be 0.5 μm - 1.5 μm. Preferably, the depth of the roll-pressed embossing structure can be 1 μm.

[0075] Furthermore, if the size h of the second part 202 of the positive electrode sheet 11 protruding from the surface of the first part 201 is too high, it will cause the first steps of the positive electrode sheet 11 and the negative electrode sheet 12 to be unable to contact and lithium plating will occur. If the size h of the second part 202 of the positive electrode sheet 11 protruding from the surface of the first part 201 is too low, the stopping effect on the adjacent electrode sheets will be affected. Therefore, h can be made to satisfy: h1 ≤ 1 / 2H, where H is the thickness of the first part 201 of the negative electrode sheet 12. This can ensure the limiting effect of the second part 202 while reducing the lithium plating effect of the electrode sheet.

[0076] It should also be noted that preferably the protruding height h = 1 / 2H - 8 μm, and 8 μm is the coating error of the active coating 200. This can avoid the negative impact caused by an overly high protruding height design.

[0077] Accordingly, the size by which the second portion 202 of the negative electrode sheet 12 protrudes from the surface of the first portion 201 is the same as that of the positive electrode sheet 11, and details are not described herein again.

[0078] As Figure 4 and Figure 10 shown, the positive electrode sheet 11 includes a positive electrode tab 110, and the positive electrode tab 110 is located between the first side and the second side; the negative electrode sheet 12 includes a negative electrode tab 120, and the negative electrode tab 120 protrudes and is disposed at an edge of the second portion 202 away from the first portion 201, and the negative electrode tab 120 is located between the first side and the second side of the positive electrode sheet 11. Such a setting makes the positive electrode tab 110 and the negative electrode tab 120 respectively located on two sides of the solid battery in the first direction, thereby facilitating the encapsulation of the stacked battery cells.

[0079] In other embodiments, the positive electrode sheet 11 can also be arranged in another structure. As Figure 8 shown, the positive electrode tab 110 can be protrudingly arranged at an edge of the second portion 202 away from the first portion 201, and the structure of the negative electrode tab 120 remains unchanged, that is, the negative electrode tab 120 protrudes and is disposed at an edge of the second portion 202 away from the first portion 201, and the negative electrode tab 120 is located between the first side and the second side of the positive electrode sheet 11.

[0080] The above setting method of the positive electrode tab enables the positive electrode current collector 100 to continuously coat the positive electrode active material, and there is no need to interrupt the coating of the positive electrode material to form the positive electrode tab 110, thereby improving the processing efficiency of the positive electrode sheet.

[0081] In some embodiments, the solid battery further includes a protective film 300. The protective film 300 is wrapped around the circumferential outer sides of the positive electrode sheet 11 and the negative electrode sheet 12, and the positive electrode tab 110 and the negative electrode tab 120 are exposed outside the protective film 300.

[0082] In some embodiments, the protective film 300 includes a first film layer 310 covering the positive electrode sheet 11. A first boss structure 311 is provided on the surface of the first film layer 310 facing the positive electrode sheet 11. The first boss structure 311 extends into the limiting space and is in contact and cooperation with the first portion 201.

[0083] Accordingly, the protective film 300 further includes a second film layer 320 covering the negative electrode sheet 12. A second boss structure 321 is provided on the surface of the second film layer 320 facing the negative electrode sheet 12. The second boss structure 321 extends into the limiting space and is in contact and cooperation with the first portion 201.

[0084] In the above structure, after the positive electrode sheet 11 and the negative electrode sheet 12 are stacked, the electrode sheets on the outermost layer and the innermost layer have a second part 202 protruding from the first part 201, resulting in an uneven surface of the electrode sheet. During subsequent processes such as assembly, charging, and discharging, it is likely to cause uneven stress and deformation and damage of the electrode sheet. By using the above-mentioned protective film 300 and providing a first boss structure 311 and a second boss structure 321 therein, the limiting space of the electrode sheet can be filled by the first boss structure 311 or the second boss structure 321, ensuring uniform stress during the subsequent processing and forming of the solid-state battery, thereby guaranteeing the quality of the solid-state battery.

[0085] It should be noted that the structure of the protective film 300 can be set according to the shapes of the positive electrode sheet 11 and the negative electrode sheet 12, exposing the positive electrode tab 110 and the negative electrode tab 120 while wrapping the stacked positive electrode sheet 11 and negative electrode sheet 12, facilitating the subsequent processing of the electrodes of the solid-state battery.

[0086] Exemplarily, Figure 14 the protective film 300 in Figure 5 is applied to the scenario where the positive electrode sheet adopts the embodiment shown in Figure 10 , and the negative electrode sheet adopts the embodiment shown in

[0087] Figure 15 . At this time, since the angle between the positive electrode tab and the negative electrode tab is 180°, the protective film 300 can be disposed around the sides of the positive electrode sheet and the negative electrode sheet. Figure 8 the embodiment of Figure 10 , and the negative electrode sheet adopts the embodiment shown in

[0088] . At this time, the angle between the positive electrode tab and the negative electrode tab is 90°, so when setting the protective film 300, it is necessary to consider avoiding the positive electrode tab or the negative electrode tab.

[0089] It should also be noted that the first boss structure 311 and the second boss structure 321 can be aerogel or mica sheets, and the thickness of the first boss structure 311 and the second boss structure 321 is h. In addition, the aerogel or mica sheet is heat-melted and connected to the protective film 300 after being perforated, which can also prevent heat diffusion between solid-state batteries. The embodiment of the present application also provides an electrical device, including the solid-state battery described in any of the above embodiments, and the solid-state battery is used to provide electrical energy for the electrical device.

[0090] The electrical device in the embodiment of the present application can be a vehicle. For example, the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Correspondingly, the electrical device can be a driving mechanism of the vehicle or a control system of the vehicle.

[0091] In addition, the electrical device may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, power tools, ships, and spacecrafts. Among them, the spacecraft may include airplanes, rockets, space shuttles, or spaceships.

[0092] Since the electrical device in this embodiment includes the battery pack described in any of the above embodiments, the electrical device includes the battery pack structure and beneficial effects, which will not be elaborated herein.

[0093] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0094] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0095] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and drawings of the present application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0096] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole piece of a solid-state battery, characterized in that: include: A current collector (100), the current collector (100) comprising a first side edge and a second side edge arranged opposite to each other; An active coating (200), the active coating (200) being located on the surface of the current collector (100), the active coating (200) comprising a first portion (201) and a second portion (202), the first portion (201) being located in the middle of the current collector (100), and the second portion (202) being located at the first side edge and the second side edge; the surface of the second portion (202) protrudes from the surface of the first portion (201); A limiting space (203) is formed between the second portion (202) located at the first side edge and the second side edge.

2. The pole piece according to claim 1, characterized in that: The current collector (100) comprises a first surface and a second surface arranged opposite to each other in a thickness direction thereof, the active coating (200) comprises a first active coating (210) coated on the first surface of the current collector (100), the first active coating (210) comprises a first portion (201) and a second portion (202), the first portion (201) is located in the middle of the current collector (100), and the second portion (202) is located at the first side edge and the second side edge; the surface of the second portion (202) protrudes from the surface of the first portion (201); A first limiting space (211) is formed between the second portion (202) located at the first side edge and the second side edge.

3. The pole piece according to claim 2, characterized in that: The active coating (200) comprises a second active coating (220) coated on the second surface of the current collector (100), the second active coating (220) comprises a first portion (201) and a second portion (202), the first portion (201) is located in the middle of the current collector (100), and the second portion (202) is located at the second side edge and the second side edge; the surface of the second portion (202) protrudes from the surface of the first portion (201); A second limiting space (221) is formed between the second side edge and the second portion (202) of the second side edge.

4. The pole piece according to claim 3, characterized in that: Along the thickness direction of the pole piece, the first portions (201) of the first active coating (210) and the second active coating (220) are opposite to each other, and the second portions (202) of the first active coating (210) and the second active coating (220) are opposite to each other.

5. The pole piece according to any one of claims 1 to 4, characterized in that: The second portion (202) is coated with an insulating layer.

6. The pole piece according to claim 5, characterized in that: The width D of the second portion (202) located at the first side edge is between 1 mm and 3 mm; And / or, a width D of the second portion (202) located at the second side edge is between 1 mm and 3 mm.

7. The pole piece according to any one of claims 1 to 4, characterized in that: The second portion (202) is provided with a roll-embossed structure on the surface in the thickness direction of the pole piece.

8. A solid-state battery, characterized in that: include: A positive electrode sheet (11) and a negative electrode sheet (12), wherein the positive electrode sheet (11) and the negative electrode sheet (12) are both the electrode sheets according to any one of claims 1 to 7; The positive electrode sheet (11) and the negative electrode sheet (12) are stacked in the thickness direction of the solid-state battery, the positive electrode sheet (11) is limited in the limited space of the negative electrode sheet (12), and the negative electrode sheet (12) is limited in the limited space of the positive electrode sheet (11).

9. The solid-state battery according to claim 8, characterized in that: The dimension of the second portion (202) of the positive electrode sheet (11) protruding from the surface of the first portion (201) is h, the thickness of the first portion (201) of the negative electrode sheet (12) is H, and h and H satisfy: h≤1 / 2H.

10. The solid-state battery according to claim 8, characterized in that: The positive electrode sheet (11) comprises a positive electrode tab (110), and the positive electrode tab (110) is located between the first side edge and the second side edge; The negative electrode sheet (12) comprises a negative electrode tab (120), wherein the negative electrode tab (120) is protrudingly arranged at an edge of the second portion (202) away from the first portion (201), and the negative electrode tab (120) is located between a first side edge and a second side edge of the positive electrode sheet (11).

11. The solid-state battery according to claim 8, characterized in that: The positive electrode sheet (11) comprises a positive electrode tab (110), wherein the positive electrode tab (110) is protrudingly arranged at an edge of the second portion (202) away from the first portion (201); The negative electrode sheet (12) comprises a negative electrode tab (120), wherein the negative electrode tab (120) is protrudingly arranged at an edge of the second portion (202) away from the first portion (201), and the negative electrode tab (120) is located between a first side edge and a second side edge of the positive electrode sheet (11).

12. The solid-state battery according to claim 10 or 11, characterized in that: The solid-state battery further comprises a protective film (300), wherein the protective film (300) is wrapped around the circumferential outer side of the positive electrode sheet (11) and the negative electrode sheet (12), and the positive electrode tab (110) and the negative electrode tab (120) are exposed from the protective film (300).

13. The solid-state battery according to claim 12, characterized in that: The protective film (300) comprises a first film layer (310) covering the positive electrode sheet (11); a first boss structure (311) is provided on a surface of the first film layer (310) facing the positive electrode sheet (11); the first boss structure (311) extends into the limiting space (203) and contacts and cooperates with the first portion (201); and / or, The protective film (300) comprises a second film layer (320) covering the negative electrode sheet (12); a second boss structure (321) is provided on a surface of the second film layer (320) facing the negative electrode sheet (12); the second boss structure (321) extends into the limiting space (203) and contacts and cooperates with the first portion (201).

14. An electrical device, characterized in that: A solid-state battery comprising the solid-state battery described in any one of claims 8 to 13.

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