All-solid-state battery cell and manufacturing method of all-solid-state battery cell

Abstract

The invention discloses an all-solid-state battery cell and a manufacturing method of the all-solid-state battery cell. The all-solid-state battery cell comprises a positive plate and a negative plate, the negative electrode insulation composite unit is laminated with the positive plate; wherein the negative plate comprises a negative current collector and a negative material, the negative material is located on the surface of the negative current collector, the insulating rubber frame is located on the side, away from the negative current collector, of the negative material and points to the negative insulating composite unit along the positive plate, and the orthographic projection of the positive plate is located in the orthographic projection of the insulating rubber frame. The invention provides an all-solid-state battery, and aims to reduce the probability of an internal short circuit condition, so that the performance of an all-solid-state battery cell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state batteries, and more specifically, to an all-solid-state battery cell and a method for manufacturing the all-solid-state battery cell. Background Art

[0002] With the rapid development of new energy technologies, solid-state battery manufacturing represents a new frontier in energy storage technology. Unlike traditional lithium-ion batteries that use liquid electrolytes, solid-state batteries use solid electrolytes and have the advantages of higher safety, greater energy density, and a wider operating temperature range.

[0003] In the process of preparing lithium batteries, the battery structure is designed to be a "negative electrode wrapped in positive electrode" structure, that is, the area of ​​the negative electrode sheet is larger than the area of ​​the positive electrode sheet, and the positive electrode sheet and the negative electrode sheet are centered after being stacked so that the width and length of the positive electrode sheet are smaller than those of the negative electrode sheet. However, when this structure is applied to all-solid-state batteries, since all-solid-state batteries do not contain diaphragms similar to those in liquid lithium batteries, a solid electrolyte layer will be provided between the positive electrode sheet and the negative electrode sheet. For solid-state batteries, the size of the electrolyte membrane and the positive and negative electrode layers are different. Therefore, when isostatic pressing or flat pressing is performed after stacking, the edge of the positive electrode sheet generates shear force on the electrolyte layer due to the difference in size between the positive electrode sheet, the negative electrode sheet and the electrolyte membrane, which can easily cause the edge of the positive electrode sheet to pierce the electrolyte layer and contact with the negative electrode layer, causing a short circuit in the battery.

[0004] Therefore, there is an urgent need to provide an all-solid-state battery cell to reduce the probability of internal short circuit in the all-solid-state battery and improve the production quality of the all-solid-state battery. Summary of the invention

[0005] In view of this, the present invention provides an all-solid-state battery cell and a method for manufacturing the all-solid-state battery cell, aiming to reduce the probability of internal short circuits and thereby improve the performance of the all-solid-state battery cell.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The present invention provides an all-solid-state battery cell, the all-solid-state battery cell comprising:

[0008] Positive electrode;

[0009] A negative electrode insulating composite unit, wherein the negative electrode insulating composite unit is stacked with a positive electrode sheet; wherein the negative electrode insulating composite unit comprises a negative electrode sheet and an insulating rubber frame, the negative electrode sheet comprises a negative electrode current collector and a negative electrode material, the negative electrode material is located on the surface of the negative electrode current collector, the insulating rubber frame is located on the side of the negative electrode material away from the negative electrode current collector, and along the direction of the positive electrode sheet pointing to the negative electrode insulating composite unit, the orthographic projection of the positive electrode sheet is located within the orthographic projection of the insulating rubber frame.

[0010] Optionally, along the direction from the positive electrode sheet to the negative electrode insulating composite unit, the height of the insulating rubber frame is half the thickness of the positive electrode sheet.

[0011] Optionally, along the direction from the positive electrode sheet to the negative electrode insulating composite unit, the outer edge of the negative electrode material is flush with the outer edge of the insulating rubber frame.

[0012] Optionally, in a direction from the edge of the negative electrode insulating composite unit to the center of the negative electrode insulating composite unit, the frame width of the insulating rubber frame is between 0.5 mm and 3 mm.

[0013] Optionally, the negative electrode insulating composite unit includes a first negative electrode insulating composite unit or a second negative electrode insulating composite unit, the first negative electrode insulating composite unit is a single-sided coated negative electrode insulating composite unit, and the second negative electrode insulating composite unit is a double-sided coated negative electrode insulating composite unit, wherein:

[0014] The all-solid-state battery cell comprises a stacked first negative electrode insulation composite unit or a second negative electrode insulation composite unit, a positive electrode sheet, a first negative electrode insulation composite unit or a second negative electrode insulation composite unit;

[0015] Alternatively, the all-solid-state battery cell comprises a stacked positive electrode sheet, a second negative electrode insulating composite unit, and a positive electrode sheet;

[0016] Alternatively, the all-solid-state battery cell includes a stacked first negative electrode insulation composite unit or a second negative electrode insulation composite unit, a positive electrode sheet, a second negative electrode insulation composite unit, a positive electrode sheet, a first negative electrode insulation composite unit or a second negative electrode insulation composite unit;

[0017] Alternatively, the all-solid-state battery cell comprises a stacked first negative electrode insulation composite unit or a second negative electrode insulation composite unit, a positive electrode sheet, a second negative electrode insulation composite unit, and a positive electrode sheet;

[0018] Alternatively, the all-solid-state battery cell includes a stacked positive electrode sheet, a second negative electrode insulation composite unit, a positive electrode sheet, a first negative electrode insulation composite unit or a second negative electrode insulation composite unit.

[0019] Optionally, the insulating rubber frame includes a first insulating rubber frame corresponding to the first negative electrode insulating composite unit, and a second insulating rubber frame corresponding to the second negative electrode insulating composite unit, and the negative electrode sheet includes a first negative electrode sheet corresponding to the first negative electrode insulating composite unit and a second negative electrode sheet corresponding to the second negative electrode insulating composite unit;

[0020] The first negative electrode sheet includes a first negative electrode current collector and a first negative electrode material, and the second negative electrode sheet includes a second negative electrode current collector and a second negative electrode material;

[0021] The first negative electrode material is coated on the first surface of the first negative electrode collector; the second negative electrode material is coated on the second surface of the second negative electrode collector; the first surface is the surface on the same side as the first insulating rubber frame, and the second surface is the surface on the same side as the second insulating rubber frame.

[0022] Optionally, the positive electrode sheet includes a positive electrode current collector, a positive electrode material and an electrolyte, and the positive electrode material is coated on the front and back surfaces of the positive electrode current collector;

[0023] The negative electrode sheet includes a negative electrode current collector and a negative electrode material, and the negative electrode material is coated on the front and back sides of the negative electrode current collector by a coating device;

[0024] The electrolyte is coated on the surface of the positive electrode material and / or the surface of the negative electrode material by a coating device, and the number of layers of the electrolyte includes a single layer or a double layer; the positive electrode collector and the negative electrode collector both have a tab on one side.

[0025] Optionally, the negative electrode material includes at least one of a carbon material, a silicon-based material, and a metal oxide material; the positive electrode material includes one of nickel sulfate, manganese sulfate, cobalt sulfate, metallic nickel, battery-grade lithium carbonate, battery-grade lithium hydroxide, and lithium iron phosphate materials.

[0026] In a second aspect, the present invention provides a method for manufacturing an all-solid-state battery cell, comprising:

[0027] preparing a positive electrode sheet;

[0028] Prepare a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode material, and the negative electrode material is coated on the surface of the negative electrode current collector;

[0029] Prefabricated adhesive frame;

[0030] Placing the glue frame on the glue dispensing device, so that the glue dispensing device can automatically track and dispense glue to the glue frame, and solidify the glue frame to obtain an insulating glue frame;

[0031] The insulating rubber frame is located on the side of the negative electrode material away from the negative electrode current collector to obtain a negative electrode insulating composite unit, and the positive projection of the positive electrode sheet is located within the positive projection of the insulating rubber frame.

[0032] Optionally, preparing the positive electrode sheet includes: coating the positive electrode material on the front and back sides of the positive electrode current collector, and coating the electrolyte on the surface of the positive electrode material and / or the surface of the negative electrode material by a coating device.

[0033] The manufacturing method of the all-solid-state battery cell provided by the present invention ensures effective insulation isolation between the positive electrode sheet and the negative electrode sheet by setting an insulating rubber frame, significantly reduces the risk of positive and negative electrode short circuits, reduces the probability of internal short circuits, and thus improves the performance of the all-solid-state battery cell.

[0034] Compared with the prior art, the all-solid-state battery cell provided by the present invention achieves at least the following beneficial effects: the all-solid-state battery cell comprises: a positive electrode sheet; a negative electrode insulating composite unit, the negative electrode insulating composite unit is stacked with the positive electrode sheet; wherein the negative electrode insulating composite unit comprises a negative electrode sheet and an insulating rubber frame, the negative electrode sheet comprises a negative electrode current collector and a negative electrode material, the negative electrode material is located on the surface of the negative electrode current collector, the insulating rubber frame is located on the side of the negative electrode material away from the negative electrode current collector, and the positive projection of the positive electrode sheet is located within the positive projection of the insulating rubber frame in the direction of the positive electrode sheet pointing to the negative electrode insulating composite unit. The all-solid-state battery cell proposed in the present application, through the setting of the insulating rubber frame, ensures that there is effective insulation isolation between the positive electrode sheet and the negative electrode sheet, significantly reduces the risk of positive and negative electrode short circuits, reduces the probability of internal short circuits, and thus improves the performance of the all-solid-state battery cell. In addition, by stacking the negative electrode insulating composite unit as a whole with the positive electrode sheet, thereby forming an all-solid-state battery cell, not only can reliable electrical isolation be provided, but also it is easy to assemble during the manufacturing process, which helps to improve the safety and stability of the all-solid-state battery cell.

[0035] Of course, any product implementing the present invention does not necessarily need to achieve all of the above technical effects at the same time.

[0036] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0038] Figure 1 is an axonometric schematic diagram of the all-solid-state battery cell provided by the present invention;

[0039] Figure 2 is a schematic diagram of a negative electrode insulating composite unit provided by the present invention;

[0040] Figure 3 is a cross-sectional schematic diagram of the positive electrode sheet provided by the present invention;

[0041] Figure 4 yes Figure 1 A cross-section in the A-A' direction;

[0042] Figure 5 yes Figure 1 Another cross-sectional view along the A-A' direction;

[0043] Figure 6 yes Figure 1 Another cross-sectional view along the A-A' direction;

[0044] Figure 7 yes Figure 1Another cross-sectional view along the A-A' direction;

[0045] Figure 8 yes Figure 1 Another cross-sectional view along the A-A' direction;

[0046] Fig. 9 is a cross-sectional schematic diagram of a first negative electrode insulating composite unit provided by the present invention;

[0047] Fig.10 is a cross-sectional schematic diagram of the second negative electrode insulating composite unit provided by the present invention;

[0048] Fig.11 It is a schematic flow chart of a method for manufacturing an all-solid-state battery cell provided by the present invention.

[0049] In the figure:

[0050] 1. Negative electrode insulating composite unit, 2. Positive electrode sheet, 3. Negative electrode sheet, 4. Insulating rubber frame, 21. Positive electrode current collector, 22. Positive electrode material, 23. Electrolyte, 11. First negative electrode insulating composite unit, 12. Second negative electrode insulating composite unit, 31. First negative electrode sheet; 32. Second negative electrode sheet, 311. First negative electrode current collector, 312. First negative electrode material, 321. Second negative electrode current collector, 322. Second negative electrode material. DETAILED DESCRIPTION

[0051] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0052] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0053] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0054] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0055] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0056] Example 1

[0057] Reference Figure 1 and Figure 2 , Figure 1 is an axonometric schematic diagram of the all-solid-state battery cell provided by the present invention, wherein: Figures 4 to 8 by Figure 1 The A-A' section line shown is obtained; Figure 2 Schematic diagram of the negative electrode insulation composite unit provided by the present invention. Figure 1 and Figure 2 As shown, the all-solid-state battery cell provided by the present invention includes a negative electrode insulation composite unit 1 and a positive electrode sheet 2; the negative electrode insulation composite unit 1 is stacked with the positive electrode sheet 2; wherein, the negative electrode insulation composite unit 1 includes a negative electrode sheet 3 and an insulating rubber frame 4 arranged in the same layer as the negative electrode sheet 3, the negative electrode sheet 3 includes a negative electrode collector (for example, including a first negative electrode collector 311 and / or a second negative electrode collector 321) and a negative electrode material (for example, including a first negative electrode material 312 and / or a second negative electrode material 322), the negative electrode material is located on the surface of the negative electrode collector, the insulating rubber frame 4 is located on the side of the negative electrode material away from the negative electrode collector, and along the direction of the positive electrode sheet 2 pointing to the negative electrode insulation composite unit 1, the orthographic projection of the positive electrode sheet 2 is located within the orthographic projection of the insulating rubber frame 4.

[0058] Among them, the positive electrode sheet 2 is the positive electrode material layer of the all-solid-state battery cell, which is mainly responsible for storing and releasing the positive electrode charge. It is usually composed of materials with high energy density and high conductivity, such as nickel cobalt manganese (NCM), nickel cobalt aluminum (NCA) and other positive electrode active materials. The main function of the positive electrode sheet 2 is to provide positive electrode ions during the charging and discharging process, and to generate a potential difference with the negative electrode sheet 3, thereby realizing energy storage and release.

[0059] The negative electrode sheet 3 is the negative electrode material layer of the all-solid-state battery cell, corresponding to the positive electrode sheet 2, and realizes the conduction of current by absorbing and releasing negative electrode ions. The negative electrode sheet 3 is generally made of materials such as lithium metal, silicon carbon, and graphite, and has high capacity and excellent cycle performance. During the charging process, the lithium ions released by the positive electrode sheet 2 enter the structure of the negative electrode sheet 3 to store energy; and during the discharge process, the lithium ions are released from the negative electrode sheet 3 back to the positive electrode sheet 2 to realize the current output of the all-solid-state battery cell.

[0060] The insulating rubber frame 4 is an insulating material frame arranged around the edge of the negative electrode sheet 3. Its main function is to isolate the positive electrode sheet 2 and the negative electrode sheet 3 to prevent them from directly contacting and causing a short circuit. The insulating rubber frame 4 is usually made of a material with high heat resistance and high dielectric strength, such as a polymer insulating material such as polyimide and polyvinyl alcohol. This material has excellent mechanical strength and insulation properties, and can provide stable physical and electrical isolation inside the all-solid-state battery cell.

[0061] For example, the height of the insulating rubber frame 4 is higher than that of the negative electrode sheet 3, so that the positive electrode sheet 2 can be framed by the insulating rubber frame 4 when stacked. That is, by setting the insulating rubber frame 4, it is possible to ensure that there is effective insulation isolation between the positive electrode sheet 2 and the negative electrode sheet 3, significantly reducing the risk of positive and negative short circuits, reducing the probability of internal short circuits, and thus improving the performance of the all-solid-state battery cell.

[0062] Optionally, along the direction from the positive electrode sheet 2 to the negative electrode insulating composite unit 1, the orthographic projection of the insulating rubber frame 4 may be a closed figure, that is, the insulating rubber frame 4 is continuous, and along the direction from the positive electrode sheet 2 to the negative electrode insulating composite unit 1, the orthographic projection of the insulating rubber frame 4 may also be discontinuous. The figure only schematically illustrates the case where the insulating rubber frame 4 is closed.

[0063] Optionally, along the direction from the positive electrode sheet 2 to the negative electrode insulating composite unit 1, the height of the insulating rubber frame 4 can be half the thickness of the positive electrode sheet 2. Thus, it can be ensured that the insulating rubber frame 4 will not significantly increase the stacking thickness of the all-solid-state battery cell while playing an effective isolation role, thereby enhancing the role of the insulating rubber frame 4 in preventing electrode contact and avoiding short circuits while ensuring the battery energy density.

[0064] Example 2

[0065] Based on Example 1, Figure 2 ,like Figure 2 As shown, the negative electrode insulation composite unit 1 is obtained by attaching the insulation rubber frame 4 to the negative electrode sheet 3. Along the direction of the positive electrode sheet 2 pointing to the negative electrode insulation composite unit 1, the outer edge of the negative electrode material is flush with the outer edge of the insulation rubber frame 4.

[0066] It can be understood that when the insulating rubber frame 4 is attached to the negative electrode sheet 3, a negative electrode insulating composite unit 1 can be obtained, and the outer edge of the negative electrode material is flush with the outer edge of the insulating rubber frame 4, ensuring the isolation of the edge of the negative electrode sheet 3 from the positive electrode material 22 and the electrolyte 23, thereby improving the safety of the all-solid-state battery cell and preventing the risk of short circuit caused by movement of the internal structure.

[0067] Optionally, in the direction from the edge of the negative electrode insulating composite unit 1 to the center of the negative electrode insulating composite unit 1, the frame width of the insulating rubber frame 4 is between 0.5 mm and 3 mm. For example, the frame width of the insulating rubber frame 4 is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, etc., which is not limited to the present invention.

[0068] For example, if the frame width of the insulating rubber frame 4 is less than 0.5mm, the isolation ability of the insulating rubber frame 4 will be weakened, and the contact between the positive and negative electrodes will not be fully isolated, thereby increasing the risk of short circuit. If the frame width of the insulating rubber frame 4 is greater than 3mm, it will occupy the effective space inside the all-solid-state battery cell, reduce the proportion of positive and negative electrode materials, thereby reducing the energy density of the all-solid-state and affecting the endurance performance of the all-solid-state. Therefore, setting the frame width of the insulating rubber frame 4 between 0.5mm and 3mm can ensure the stability of the internal structure of the all-solid-state battery cell while effectively avoiding possible short circuits between the positive and negative electrodes, thereby improving the overall insulation performance and safety of the battery.

[0069] Example 3

[0070] On the basis of Example 1, the negative electrode insulating composite unit 1 in the all-solid-state battery cell of this embodiment includes a first negative electrode insulating composite unit 11 or a second negative electrode insulating composite unit 12, the first negative electrode insulating composite unit 11 is a single-sided coated negative electrode insulating composite unit, and the second negative electrode insulating composite unit 12 is a double-sided coated negative electrode insulating composite unit.

[0071] Reference Figure 4 , Figure 4 yes Figure 1 A cross-sectional view taken along the A-A' direction. The all-solid-state battery cell includes a stacked first negative electrode insulation composite unit 11 or a second negative electrode insulation composite unit 12, a positive electrode sheet 2, a first negative electrode insulation composite unit 11 or a second negative electrode insulation composite unit 12. Figure 4 An example of an all-solid-state battery cell including a stacked first negative electrode insulating composite unit 11 , a positive electrode sheet 2 , and a first negative electrode insulating composite unit 11 is used for description.

[0072] Reference Figure 5 , Figure 5 yes Figure 1 Another cross-sectional view along the line A-A'. The all-solid-state battery cell comprises a stacked positive electrode sheet 2, a second negative electrode insulating composite unit 12, and a positive electrode sheet 2.

[0073] Reference Figure 6 , Figure 6 yes Figure 1 Another cross-sectional view along the A-A' direction. The all-solid-state battery cell includes a stacked first negative electrode insulation composite unit 11 or a second negative electrode insulation composite unit 12, a positive electrode sheet 2, a second negative electrode insulation composite unit 12, a positive electrode sheet 2, a first negative electrode insulation composite unit 11 or a second negative electrode insulation composite unit 12. Among them, Figure 6 An example is given for explanation in which an all-solid-state battery cell includes a stacked first negative electrode insulating composite unit 11 , a positive electrode sheet 2 , a second negative electrode insulating composite unit 12 , a positive electrode sheet 2 , and a first negative electrode insulating composite unit 11 .

[0074] Reference Figure 7 , Figure 7 yes Figure 1 Another cross-sectional view along the A-A' direction. The all-solid-state battery cell includes a stacked first negative electrode insulation composite unit 11 or a second negative electrode insulation composite unit 12, a positive electrode sheet 2, a second negative electrode insulation composite unit 12, and a positive electrode sheet 2. Among them, Figure 7 An example of a fully solid-state battery cell including a stacked first negative electrode insulating composite unit 11 , a positive electrode sheet 2 , a second negative electrode insulating composite unit 12 , and a positive electrode sheet 2 is used for description.

[0075] Reference Figure 8 , Figure 8 yes Figure 1 Another cross-sectional view along the A-A' direction. The all-solid-state battery cell includes a stacked positive electrode sheet 2, a second negative electrode insulation composite unit 12, a positive electrode sheet 2, a first negative electrode insulation composite unit 11 or a second negative electrode insulation composite unit 12. Among them, Figure 8 An example of a fully solid-state battery cell including a stacked positive electrode sheet 2 , a second negative electrode insulating composite unit 12 , a positive electrode sheet 2 , and a first negative electrode insulating composite unit 11 is used for description.

[0076] In the above embodiments, by adopting the first negative electrode insulation composite unit 11 and / or the second negative electrode insulation composite unit 12, the present invention provides a multi-layer insulation design, which can effectively isolate the direct contact between the positive electrode sheet 2 and the negative electrode sheet 3, significantly reduce the risk of short circuit, and further improve the safety and insulation performance of the all-solid-state battery. Specifically, the present invention provides a variety of stacking structure solutions ( Figures 4 to 8 ), so that the all-solid-state battery cell can select a suitable structural layout according to the requirements of different application scenarios, and the design of different stacking combinations enhances the flexibility of the all-solid-state battery cell. In addition, through the combination of the first negative electrode insulating composite unit 11 and the second negative electrode insulating composite unit 12 and the design of multiple stacking structures, a diversified layout of the internal structure of the all-solid-state battery cell is achieved, which improves the insulation effect, safety, mechanical strength and adaptability of the all-solid-state battery cell.

[0077] Example 4

[0078] Based on Example 3, Fig. 9 as well as Fig.10 , Fig. 9 is a cross-sectional schematic diagram of a first negative electrode insulating composite unit provided by the present invention; Fig.10 Schematic cross-sectional view of the second negative electrode insulating composite unit provided by the present invention. Fig. 9 as well as Fig.10 As shown, the insulating rubber frame 4 includes a first insulating rubber frame (not shown) corresponding to the first negative electrode insulating composite unit 11, and a second insulating rubber frame (not shown) corresponding to the second negative electrode insulating composite unit 12, and the negative electrode sheet 3 includes a first negative electrode sheet 31 corresponding to the first negative electrode insulating composite unit 11 and a second negative electrode sheet 32 ​​corresponding to the second negative electrode insulating composite unit 12;

[0079] The first negative electrode sheet 31 includes a first negative electrode current collector 311 and a first negative electrode material 312 , and the second negative electrode sheet 32 ​​includes a second negative electrode current collector 321 and a second negative electrode material 322 ;

[0080] The first negative electrode material 312 is coated on the first surface of the first negative electrode current collector 311; the second negative electrode material 322 is coated on the second surface of the second negative electrode current collector 321; the first surface is the surface on the same side as the first insulating rubber frame (not shown), and the second surface is the surface on the same side as the second insulating rubber frame (not shown). Thus, an effective isolation layer can be formed, which avoids direct contact between the positive electrode sheet 2 and the negative electrode sheet 3, reduces the possibility of internal short circuit of the all-solid-state battery cell, and significantly improves the insulation performance and safety of the all-solid-state battery cell.

[0081] For example, the first insulating rubber frame is located on the surface of the first negative electrode material 312, and then the first negative electrode material 312 is coated on the first surface of the first negative electrode collector 311 on the same side as the first insulating rubber frame; the second insulating rubber frame is located on the surface of the second negative electrode material 322, and then the second negative electrode material 322 is coated on the second surface of the second negative electrode collector 321 on the same side as the second insulating rubber frame.

[0082] Example 5

[0083] On the basis of Example 1, continue to refer to Figure 3 ,like Figure 3 As shown, the positive electrode sheet 2 includes a positive electrode current collector 21, a positive electrode material 22 and an electrolyte 23, and the positive electrode material 22 is coated on the front and back surfaces of the positive electrode current collector 21; Fig. 9 and Fig.10 The negative electrode sheet 3 includes a negative electrode collector (for example, a first negative electrode collector 311 and / or a second negative electrode collector 321) and a negative electrode material (for example, a first negative electrode material 312 and / or a second negative electrode material 322), and the negative electrode material is coated on the front and back sides of the negative electrode collector by a coating device; the electrolyte 23 is coated on the surface of the positive electrode material 22 and / or the surface of the negative electrode material by a coating device, and the number of layers of the electrolyte 23 includes a single layer or a double layer; the positive electrode collector 21 and the negative electrode collector both have a tab on one side.

[0084] It should be noted that the tab refers to the lead-out terminal or conductive part on the positive electrode sheet 2 or negative electrode sheet 3 of the all-solid-state battery cell that is used to connect the active material inside the battery with the external circuit. The main function of the tab is to guide the current to flow outside the battery, so that the battery can be connected to other devices or battery cells to achieve the output or input of electrical energy.

[0085] For example, the electrolyte 23 can be a single layer or a double layer. This flexible setting enables users to adjust the structure of the all-solid-state battery cell according to different needs. The single-layer structure can reduce the amount of materials used and reduce production costs; the double-layer structure can enhance the isolation and stability of the all-solid-state battery cell. In addition, the tabs are uniformly led out from one side, which simplifies the assembly process of the all-solid-state battery cell and makes the production process more convenient and efficient.

[0086] In the above embodiments, the positive electrode material 22 is uniformly coated on the front and back surfaces of the positive electrode collector 21, and the negative electrode material is uniformly coated on the front and back surfaces of the negative electrode collector, so that the utilization rate of the positive electrode material 22 and the negative electrode material is significantly improved, and the surface area of ​​the positive electrode collector 21 and the negative electrode collector is more fully utilized, which effectively improves the energy density and capacity of the all-solid-state battery cell, and helps to achieve higher energy output without increasing the volume of the all-solid-state battery cell.

[0087] In addition, an electrolyte 23 is provided to be coated on the surface of the positive electrode material 22 and / or the surface of the negative electrode material through a coating device, and the number of layers of the electrolyte 23 includes a single layer or a double layer, which can effectively enhance the ionic conductivity of the all-solid-state battery cell and reduce the ion transmission resistance. Thus, the electrolyte 23 plays the role of ion conduction and isolation, so the above implementation not only improves the charging and discharging efficiency of the all-solid-state battery cell, but also enhances the stability inside the all-solid-state battery cell, reduces the side reactions in the electrochemical reaction, and further prolongs the cycle life of the all-solid-state battery cell.

[0088] Optionally, the negative electrode material includes at least one of a carbon material, a silicon-based material, and a metal oxide material; the positive electrode material 22 includes one of nickel sulfate, manganese sulfate, cobalt sulfate, metallic nickel, battery-grade lithium carbonate, battery-grade lithium hydroxide, and lithium iron phosphate materials.

[0089] It should be understood that carbon materials have excellent conductivity, silicon-based materials have high energy density, and metal oxide materials have high capacity stability. The positive electrode material uses active substances such as nickel sulfate, manganese sulfate, and cobalt sulfate to achieve high voltage and high energy density characteristics. The setting of the above materials enables the all-solid-state battery to flexibly configure positive and negative electrode materials in different application scenarios to meet different performance requirements such as high capacity, long cycle life and excellent safety.

[0090] The all-solid-state battery cell provided by the present invention achieves at least the following beneficial effects: the all-solid-state battery cell comprises: a positive electrode sheet 2; a negative electrode insulating composite unit 1, wherein the negative electrode insulating composite unit 1 is stacked with the positive electrode sheet 2; wherein the negative electrode insulating composite unit 1 comprises a negative electrode sheet 3 and an insulating rubber frame 4 arranged in the same layer as the negative electrode sheet 3, and in the direction from the positive electrode sheet 2 to the negative electrode insulating composite unit 1, the positive projection of the positive electrode sheet 2 and the positive projection of the negative electrode sheet 3 are both located within the positive projection of the insulating rubber frame 4. The all-solid-state battery cell proposed in the present application, through the setting of the insulating rubber frame 4, ensures that there is effective insulation isolation between the positive electrode sheet 2 and the negative electrode sheet 3, significantly reduces the risk of positive and negative short circuits, reduces the probability of internal short circuits, and thus improves the performance of the all-solid-state battery cell. In addition, by superimposing the negative electrode insulating composite unit 1 as a whole with the positive electrode sheet 2, thereby forming an all-solid-state battery cell, not only can reliable electrical isolation be provided, but also it is easy to assemble during the manufacturing process, which helps to improve the safety and stability of the all-solid-state battery cell.

[0091] Example 6

[0092] Reference Fig.11 , Fig.11 FIG. 1 is a flow chart of a method for manufacturing an all-solid-state battery cell provided by the present invention. Fig.11 As shown, the method for manufacturing the all-solid-state battery cell includes the following steps.

[0093] In step S11, a positive electrode sheet is prepared.

[0094] Optionally, preparing the positive electrode sheet includes: coating the positive electrode material on the front and back sides of the positive electrode current collector, and coating the electrolyte on the surface of the positive electrode material and / or the surface of the negative electrode material by a coating device.

[0095] In this way, the surface area of ​​the positive electrode current collector can be fully utilized, thereby increasing the energy density of the battery cell and improving the conductivity of the battery.

[0096] In step S12, a negative electrode sheet is prepared, wherein the negative electrode sheet includes a negative electrode current collector and a negative electrode material, and the negative electrode material is coated on the surface of the negative electrode current collector.

[0097] In step S13, a glue frame with adhesiveness is prefabricated.

[0098] For example, the adhesive glue frame can firmly adhere to the periphery of the negative electrode sheet during the subsequent dispensing and curing process, thereby fixing the negative electrode sheet and preventing short circuit problems caused by electrode contact.

[0099] In step S14, the glue frame is placed on a glue dispensing device, so that the glue dispensing device automatically tracks and dispenses glue on the glue frame, and solidifies the glue frame to obtain an insulating glue frame.

[0100] In step S15, the insulating rubber frame is located on the side of the negative electrode material away from the negative electrode current collector to obtain a negative electrode insulating composite unit, and the orthographic projection of the positive electrode sheet is located within the orthographic projection of the insulating rubber frame.

[0101] For example, the positive projection of the positive electrode sheet is within the insulating rubber frame, which effectively isolates the positive electrode sheet from the negative electrode sheet, further reduces the risk of short circuit, and enhances the safety of the all-solid-state battery cell.

[0102] The manufacturing method of the all-solid-state battery cell provided by the present invention limits the spatial position of the positive electrode sheet and the negative electrode sheet by setting an insulating rubber frame, thereby ensuring effective insulation isolation between the positive electrode sheet and the negative electrode sheet, significantly reducing the risk of short circuit between the positive and negative electrodes, and reducing the probability of internal short circuit, thereby improving the performance of the all-solid-state battery cell.

[0103] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An all-solid-state battery cell, characterized in that: The all-solid-state battery cell comprises: Positive electrode; A negative electrode insulating composite unit, wherein the negative electrode insulating composite unit is stacked with the positive electrode sheet; wherein the negative electrode insulating composite unit comprises a negative electrode sheet and an insulating rubber frame, the negative electrode sheet comprises a negative electrode current collector and a negative electrode material, the negative electrode material is located on the surface of the negative electrode current collector, the insulating rubber frame is located on the side of the negative electrode material away from the negative electrode current collector, and along the direction of the positive electrode sheet pointing to the negative electrode insulating composite unit, the orthographic projection of the positive electrode sheet is located within the orthographic projection of the insulating rubber frame.

2. The all-solid-state battery cell according to claim 1, characterized in that: Along the direction from the positive electrode sheet to the negative electrode insulating composite unit, the height of the insulating rubber frame is half the thickness of the positive electrode sheet.

3. The all-solid-state battery cell according to claim 1, characterized in that: Along the direction from the positive electrode sheet to the negative electrode insulating composite unit, the outer edge of the negative electrode material is flush with the outer edge of the insulating rubber frame.

4. The all-solid-state battery cell according to claim 1, characterized in that: In a direction from the edge of the negative electrode insulating composite unit to the center of the negative electrode insulating composite unit, the frame width of the insulating rubber frame is between 0.5 mm and 3 mm.

5. The all-solid-state battery cell according to claim 1, characterized in that: The negative electrode insulating composite unit includes a first negative electrode insulating composite unit or a second negative electrode insulating composite unit, wherein the first negative electrode insulating composite unit is a single-sided coated negative electrode insulating composite unit, and the second negative electrode insulating composite unit is a double-sided coated negative electrode insulating composite unit, wherein: The all-solid-state battery cell comprises the stacked first negative electrode insulation composite unit or the second negative electrode insulation composite unit, the positive electrode sheet, the first negative electrode insulation composite unit or the second negative electrode insulation composite unit; Alternatively, the all-solid-state battery cell comprises the stacked positive electrode sheet, the second negative electrode insulation composite unit, and the positive electrode sheet; Alternatively, the all-solid-state battery cell comprises the stacked first negative electrode insulation composite unit or the second negative electrode insulation composite unit, the positive electrode sheet, the second negative electrode insulation composite unit, the positive electrode sheet, the first negative electrode insulation composite unit or the second negative electrode insulation composite unit; Alternatively, the all-solid-state battery cell comprises the stacked first negative electrode insulation composite unit or the second negative electrode insulation composite unit, the positive electrode sheet, the second negative electrode insulation composite unit, and the positive electrode sheet; Alternatively, the all-solid-state battery cell includes the stacked positive electrode sheet, the second negative electrode insulation composite unit, the positive electrode sheet, the first negative electrode insulation composite unit or the second negative electrode insulation composite unit.

6. The all-solid-state battery cell according to claim 5, characterized in that: The insulating rubber frame includes a first insulating rubber frame corresponding to the first negative electrode insulating composite unit, and a second insulating rubber frame corresponding to the second negative electrode insulating composite unit, and the negative electrode sheet includes a first negative electrode sheet corresponding to the first negative electrode insulating composite unit and a second negative electrode sheet corresponding to the second negative electrode insulating composite unit; Wherein, the first negative electrode sheet comprises a first negative electrode current collector and a first negative electrode material, and the second negative electrode sheet comprises a second negative electrode current collector and a second negative electrode material; The first negative electrode material is coated on the first surface of the first negative electrode collector; the second negative electrode material is coated on the second surface of the second negative electrode collector; the first surface is the surface on the same side as the first insulating rubber frame, and the second surface is the surface on the same side as the second insulating rubber frame.

7. The all-solid-state battery cell according to claim 1, characterized in that: The positive electrode sheet comprises a positive electrode current collector, a positive electrode material and an electrolyte, wherein the positive electrode material is coated on the front and back surfaces of the positive electrode current collector; The negative electrode material is coated on the front and back surfaces of the negative electrode current collector by a coating device; The electrolyte is coated on the surface of the positive electrode material and / or the surface of the negative electrode material by the coating device, and the number of layers of the electrolyte includes a single layer or a double layer; the positive electrode collector and the negative electrode collector both have a tab on one side.

8. The all-solid-state battery cell according to claim 7, characterized in that: The negative electrode material includes at least one of a carbon material, a silicon-based material, and a metal oxide material; the positive electrode material includes one of nickel sulfate, manganese sulfate, cobalt sulfate, metallic nickel, battery-grade lithium carbonate, battery-grade lithium hydroxide, and lithium iron phosphate materials.

9. A method for manufacturing an all-solid-state battery cell, characterized in that: include: preparing a positive electrode sheet; Prepare a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode material, and the negative electrode material is coated on the surface of the negative electrode current collector; Prefabricated adhesive frame; Placing the glue frame on a glue dispensing device, so that the glue dispensing device can automatically follow the tracks and dispense glue to the glue frame, and solidify the glue frame to obtain an insulating glue frame; The insulating rubber frame is located at a side of the negative electrode material away from the negative electrode current collector to obtain a negative electrode insulating composite unit, and the orthographic projection of the positive electrode sheet is located within the orthographic projection of the insulating rubber frame.

10. The method for manufacturing an all-solid-state battery cell according to claim 9, characterized in that: The preparation of the positive electrode sheet comprises: coating the positive electrode material on the front and back sides of the positive electrode current collector, and coating the electrolyte on the surface of the positive electrode material and / or the surface of the negative electrode material by a coating device.

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