Solid-state battery and pressing die for electrolyte membrane

Abstract

The solid-state battery comprises the electrolyte membrane, the electrolyte membrane is provided with a first surface and a second surface, the first surface and the second surface are opposite to each other, the first surface is recessed inwards to form a first mounting part, the second surface is recessed inwards to form a second mounting part, and the first mounting part and the second mounting part are arranged on the first mounting part and the second mounting part respectively. An isolation layer is arranged between the first mounting part and the second mounting part; the positive plate is embedded into the first mounting part, and the negative plate is embedded into the second mounting part. According to the utility model, the positive plate and the negative plate are positioned through the first mounting part and the second mounting part, so that the relative positions of the positive plate and the negative plate have relatively high precision, the positive plate can be just positioned in the center area of the negative plate, and the positive plate and the negative plate do not need to be set to have an overlarge size difference, thereby avoiding excessive waste of the negative plate; and the precision requirement on lamination equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a solid-state battery and a pressing die for an electrolyte membrane. Background Art

[0002] A significant difference between all-solid-state batteries and traditional liquid batteries is the use of solid-state electrolytes instead of traditional liquid electrolytes and polymer separators. During solid-state battery manufacturing, the size of the electrode sheets also needs to be designed to prevent lithium dendrite precipitation and short circuits. For example, when using a ternary NCM as the positive electrode and graphite as the negative electrode, the length and width of the negative electrode sheet are usually required to be larger than the positive electrode sheet, so that the negative electrode sheet completely wraps the positive electrode sheet, ensuring that the lithium ions released from the positive electrode are completely absorbed by the negative electrode.

[0003] At present, there are two manufacturing methods for solid-state batteries: the first is to manufacture the positive electrode sheet, negative electrode sheet and electrolyte sheet separately, where the area of the positive electrode sheet is smaller than that of the negative electrode sheet, and the area of the negative electrode sheet is smaller than that of the electrolyte sheet. The positive and negative electrode sheets are then stacked on opposite sides of the electrolyte sheet respectively. During the stacking process, it is necessary to ensure that the positive electrode sheet is in the center area of the negative electrode sheet to avoid short circuit and lithium deposition after winding; the second is to cover the surface of the larger negative electrode with a layer of solid electrolyte membrane, so as to ensure that the smaller positive electrode sheet can achieve the barrier between the positive and negative electrodes as long as it is stacked on the surface of the electrolyte membrane.

[0004] However, both methods have drawbacks: In the first method, in order for the negative electrode to completely cover the positive electrode, the positive and negative electrodes need to have a large size difference, resulting in a large area of the negative electrode being wasted, and the relative position accuracy of the positive and negative electrodes during stacking is required to be high; in the second method, although the positive and negative electrodes are separated, in order to achieve perfect coverage of the positive electrode without increasing the size of the solid electrolyte layer, wet coating must be used, but it is difficult to select a suitable solvent for wet coating of the solid electrolyte layer. The selected solvent is either highly toxic, expensive, or significantly reduces the ionic conductivity of the solid electrolyte layer. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a solid-state battery and a pressing mold for an electrolyte membrane, so as to solve the problems of high difficulty in manufacturing solid-state batteries in the prior art.

[0006] The technical solution adopted by the utility model to solve the technical problem is a solid-state battery, comprising:

[0007] an electrolyte membrane having a first surface and a second surface opposite to each other, the first surface being recessed inwardly to form a first mounting portion, the second surface being recessed inwardly to form a second mounting portion, and an insulating layer being provided between the first mounting portion and the second mounting portion;

[0008] A positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet is embedded in the first mounting portion, and the negative electrode sheet is embedded in the second mounting portion.

[0009] Furthermore, the first mounting portion is symmetrical about the center of the electrolyte membrane, and the second mounting portion is symmetrical about the center of the electrolyte membrane.

[0010] Furthermore, the width of the second mounting portion is greater than the width of the first mounting portion.

[0011] Furthermore, the first mounting portion has a first bottom surface and two first side surfaces, the bottom surface of the positive electrode sheet is in contact with the first bottom surface, and the two side walls of the positive electrode sheet are respectively in contact with the two first side surfaces.

[0012] Furthermore, the second mounting portion has a second bottom surface and two second side surfaces, the top surface of the negative electrode sheet is in contact with the second bottom surface, and the two side walls of the negative electrode sheet are respectively in contact with the two second side surfaces.

[0013] Furthermore, the upper surface of the positive electrode sheet is flush with the first surface.

[0014] Furthermore, the lower surface of the negative electrode sheet is flush with the second surface.

[0015] Furthermore, a pressing mold for an electrolyte membrane is also disclosed, the pressing mold comprising:

[0016] The upper mold and the lower mold are provided, wherein the upper mold has an upper molding surface, which is convex downward to form a first convex portion; and the lower mold has a lower molding surface, which is convex upward to form a second convex portion.

[0017] Furthermore, it also includes a left mold and a right mold, the left mold has a left profile, the right mold has a right profile, and the left profile and the right profile are both planes.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] A first recessed mounting portion and a second recessed mounting portion are respectively provided on two opposing surfaces of the electrolyte membrane. The positive electrode sheet is then inserted into the first mounting portion, and the negative electrode sheet is inserted into the second mounting portion, thereby completing the installation of the positive electrode sheet, the negative electrode sheet, and the electrolyte membrane. In this way, the first and second mounting portions position the positive and negative electrode sheets, ensuring a high degree of precision in the relative positioning of the positive and negative electrode sheets. The positive electrode sheet can be positioned exactly in the center of the negative electrode sheet, eliminating the need for a significant size difference between the positive and negative electrode sheets, avoiding excessive waste of the negative electrode sheet, and reducing the precision requirements for the lamination equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the solid-state battery in Example 1;

[0021] Figure 2 Schematic diagram of the electrolyte membrane in Example 1;

[0022] Figure 3 Schematic diagram of the electrolyte membrane and the pressing mold in Example 2;

[0023] Figure 4 Schematic diagram of the pressing mold in Example 2;

[0024] In the picture:

[0025] 100, electrolyte membrane; 110, first mounting portion; 120, second mounting portion;

[0026] 200, positive electrode;

[0027] 300, negative electrode sheet;

[0028] 400. Upper mold; 410. First convex part;

[0029] 500. Lower mold; 510. Second convex part;

[0030] 600, left model;

[0031] 700, right model. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] Example 1

[0034] Please refer to Figure 1-Figure 2 , the utility model discloses a solid-state battery, comprising:

[0035] An electrolyte membrane 100 having a first surface and a second surface at opposite ends, wherein the first surface is recessed inwardly to form a first mounting portion 110, and the second surface is recessed inwardly to form a second mounting portion 120, with an insulating layer between the first mounting portion 110 and the second mounting portion 120;

[0036] A positive electrode sheet 200 and a negative electrode sheet 300 , wherein the positive electrode sheet 200 is embedded in the first mounting portion 110 , and the negative electrode sheet 300 is embedded in the second mounting portion 120 .

[0037] Specifically, the present application provides a recessed first mounting portion 110 and a second mounting portion 120 on two opposing surfaces of the electrolyte membrane 100, and then embeds the positive electrode sheet 200 into the first mounting portion 110, and the negative electrode sheet 300 into the second mounting portion 120, thereby achieving the installation of the positive electrode sheet 200, the negative electrode sheet 300, and the electrolyte membrane 100. In this way, the first mounting portion 110 and the second mounting portion 120 position the positive electrode sheet 200 and the negative electrode sheet 300, ensuring a high degree of relative precision of the positive and negative electrode sheets 300. The positive electrode sheet 200 can be positioned exactly in the center of the negative electrode sheet 300, eliminating the need for a large size difference between the positive and negative electrode sheets 300, avoiding excessive waste of the negative electrode sheet 300, and reducing the precision requirements of the lamination equipment.

[0038] The insulating layer between the first mounting portion 110 and the second mounting portion 120 serves to isolate the positive electrode sheet 200 from the negative electrode sheet 300 .

[0039] Furthermore, the first mounting portion 110 is symmetrical about the center of the electrolyte membrane 100 , and the second mounting portion 120 is symmetrical about the center of the electrolyte membrane 100 .

[0040] The width of the second mounting portion 120 is greater than the width of the first mounting portion 110 .

[0041] Specifically, the second mounting portion 120 and the first mounting portion 110 are symmetrical about the center of the electrolyte membrane 100, and the width of the second mounting portion 120 is smaller than the width of the first mounting portion 110. After the positive and negative electrode sheets 300 are respectively installed on the first mounting portion 110 and the second mounting portion 120, the width of the positive electrode sheet 200 is smaller than the width of the negative electrode sheet 300, and the positive electrode sheet 200 is exactly in the center area of the negative electrode sheet 300, ensuring that there is no short circuit and lithium deposition after winding.

[0042] Furthermore, the first mounting portion 110 has a first bottom surface and two first side surfaces. The bottom surface of the positive electrode sheet 200 is in contact with the first bottom surface, and the two side walls of the positive electrode sheet 200 are in contact with the two first side surfaces respectively.

[0043] Specifically, the first bottom surface is bonded to the bottom surface of the positive electrode sheet 200 , and the first side surface is in contact with the side wall of the positive electrode sheet 200 , so that the positive electrode sheet 200 is positioned and installed by the first installation portion 110 .

[0044] Furthermore, the second mounting portion 120 has a second bottom surface and two second side surfaces. The top surface of the negative electrode sheet 300 is in contact with the second bottom surface, and the two side walls of the negative electrode sheet 300 are in contact with the two second side surfaces respectively.

[0045] Specifically, the second bottom surface is bonded to the bottom surface of the negative electrode sheet 300 , and the second side surface is in contact with the side wall of the negative electrode sheet 300 , so that the negative electrode sheet 300 is positioned and installed by the second installation portion 120 .

[0046] It can be seen that the positive electrode sheet 200 is positioned and installed by the first mounting portion 110, and the negative electrode sheet 300 is positioned and installed by the second mounting portion 120, thereby ensuring that the relative positions of the positive electrode sheet 200 and the negative electrode sheet 300 are determined, and the relative positions of the positive and negative electrode sheets 300 have high precision.

[0047] Furthermore, the upper surface of the positive electrode sheet 200 is flush with the first surface, and the lower surface of the negative electrode sheet 300 is flush with the second surface.

[0048] Specifically, the upper surface of the positive electrode sheet 200 is flush with the first surface, and the lower surface of the negative electrode sheet 300 is flush with the second surface, so as to facilitate subsequent winding.

[0049] It should be noted that Figure 1 and Figure 2 The size ratio of the first mounting portion 110 , the second mounting portion 120 and the electrolyte membrane 100 may differ from the actual ratio. The size ratio in the drawing is only for the purpose of clearly identifying the relative positions of the positive and negative electrode sheets 300 and the electrolyte membrane 100 .

[0050] Example 2

[0051] Please refer to Figure 3-Figure 4 This embodiment discloses a pressing mold for an electrolyte membrane 100, the pressing mold comprising:

[0052] The upper mold 400 and the lower mold 500 have an upper mold surface that protrudes downward to form a first protrusion 410 ; the lower mold 500 has a lower mold surface that protrudes upward to form a second protrusion 510 .

[0053] Specifically, during the pressing process, the first protrusion 410 of the upper mold 400 can form the first mounting portion 110 on the electrolyte membrane 100 , and the second protrusion 510 of the lower mold 500 can form the second mounting portion 120 on the electrolyte membrane 100 .

[0054] Furthermore, it includes a left mold 600 and a right mold 700, the left mold 600 has a left profile, the right mold 700 has a right profile, and the left profile and the right profile are both planes.

[0055] Specifically, before pressing, the lower mold 500, the left mold 600 and the right mold 700 are first pushed to the mold closing state, so that the lower mold 500, the left mold 600 and the right mold 700 are combined to form a cavity, and a certain amount of electrolyte mixed powder is poured into the cavity. Finally, the upper mold 400 is pressed downward until the electrolyte mixed powder is pressed into an electrolyte membrane 100 of a predetermined shape and predetermined size.

[0056] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0059] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A solid-state battery, characterized in that: include: an electrolyte membrane having a first surface and a second surface opposite to each other, the first surface being recessed inwardly to form a first mounting portion, the second surface being recessed inwardly to form a second mounting portion, and an insulating layer being provided between the first mounting portion and the second mounting portion; A positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet is embedded in the first mounting portion, and the negative electrode sheet is embedded in the second mounting portion.

2. A solid-state battery according to claim 1, characterized in that: The first mounting portion is symmetrical with respect to the center of the electrolyte membrane, and the second mounting portion is symmetrical with respect to the center of the electrolyte membrane.

3. A solid-state battery according to claim 1, characterized in that: The width of the second mounting portion is greater than the width of the first mounting portion.

4. A solid-state battery according to claim 1, characterized in that: The first mounting portion has a first bottom surface and two first side surfaces. The bottom surface of the positive electrode sheet is in contact with the first bottom surface, and the two side walls of the positive electrode sheet are respectively in contact with the two first side surfaces.

5. The solid-state battery according to claim 1, characterized in that: The second mounting portion has a second bottom surface and two second side surfaces. The top surface of the negative electrode sheet is in contact with the second bottom surface, and the two side walls of the negative electrode sheet are respectively in contact with the two second side surfaces.

6. The solid-state battery according to claim 1, characterized in that: The upper surface of the positive electrode sheet is flush with the first surface.

7. The solid-state battery according to claim 1, characterized in that: The lower surface of the negative electrode sheet is flush with the second surface.

8. A pressing die for an electrolyte membrane, characterized in that: The pressing die comprises: The upper mold and the lower mold are provided, wherein the upper mold has an upper molding surface, which is convex downward to form a first convex portion; and the lower mold has a lower molding surface, which is convex upward to form a second convex portion.

9. The pressing mold for an electrolyte membrane according to claim 8, characterized in that: It also includes a left mold and a right mold, the left mold has a left profile, the right mold has a right profile, and the left profile and the right profile are both planes.

Images