Solid-state battery

Abstract

The utility model discloses a solid-state battery, which relates to the technical field of batteries and comprises a shell component, a battery cell and an electromagnetic shielding layer. The shell assembly is provided with a cavity, the shell assembly is made of an alloy material, and the thickness of the shell assembly is 0.02 mm-0. 5mm; the battery cell is arranged in the cavity; the electromagnetic shielding layer is arranged on the inner wall of the shell assembly. The shell assembly of the solid-state battery is made of an alloy material and has certain electromagnetic shielding performance, and meanwhile, the electromagnetic shielding layer on the inner wall of the shell assembly can further improve the electromagnetic shielding performance, so that interference of an external electromagnetic field on normal work of the solid-state battery is effectively reduced, and the working reliability of the solid-state battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a solid-state battery. Background Technology

[0002] During use, if there is a strong electromagnetic field in the outside (such as power equipment, wireless communication, lightning, etc.), the solid-state battery may be affected by the interference of the external electromagnetic field, which will cause changes in the internal current of the battery and affect the normal operation of the battery.

[0003] Some solid-state batteries have casings made of stainless steel, which provides some electromagnetic shielding. However, due to considerations of weight reduction and ease of processing, the stainless steel casings of solid-state batteries are designed to be very thin, thus limiting their electromagnetic shielding effect. When there is a strong magnetic field in the external environment, it may affect the normal operation of the battery.

[0004] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0005] The purpose of this invention is to provide a solid-state battery with better electromagnetic interference resistance.

[0006] To achieve the above-mentioned objectives, this utility model proposes a solid-state battery, comprising:

[0007] The outer casing assembly has a cavity, and the outer casing assembly is made of alloy material with a thickness of 0.02mm to 0.5mm;

[0008] The battery cell is disposed within the cavity; and,

[0009] An electromagnetic shielding layer is disposed on the inner wall of the outer casing assembly.

[0010] Furthermore, the electromagnetic shielding layer is an electromagnetic shielding coating covering the inner wall of the housing assembly.

[0011] Furthermore, the thickness of the electromagnetic shielding coating is 0.03 mm to 0.1 mm.

[0012] Furthermore, the electromagnetic shielding layer is an electromagnetic shielding film adhered to the inner wall of the housing assembly.

[0013] Furthermore, the thickness of the electromagnetic shielding film is 0.08 mm to 0.15 mm.

[0014] Furthermore, the outer shell assembly includes an annular middle frame and a cover plate and a bottom plate respectively connected to the two open ends of the middle frame. The middle frame, the cover plate and the bottom plate are separately arranged and cooperate to form the cavity. The electromagnetic shielding layer is provided on the surface of the middle frame, the cover plate and the bottom plate facing the cavity. The outer edges of the cover plate and the bottom plate do not extend beyond the outer peripheral surface of the middle frame.

[0015] Furthermore, the middle frame includes a plurality of flat plate portions and an arc portion connecting two adjacent plate portions, the radius of the arc portion being not less than 0.3 mm.

[0016] Furthermore, the solid-state battery also includes a cell mounting bracket disposed within the cavity and fixedly connected to the outer casing assembly. The cell is connected to the cell mounting bracket, and the cell mounting bracket is made of insulating material and separates the cell from the electromagnetic shielding layer.

[0017] Furthermore, the outer casing assembly includes an annular middle frame, and the solid-state battery further includes a positive electrode assembly connected to the middle frame. The positive electrode assembly is electrically connected to the positive electrode of the solid-state battery through a positive electrode connector, and the middle frame and the negative electrode of the solid-state battery are electrically connected through a negative electrode connector. The electromagnetic shielding layer is provided with clearance holes to avoid the connection area between the negative electrode connector and the middle frame.

[0018] Furthermore, the middle frame has through holes;

[0019] The positive electrode assembly includes a positive electrode metal component passing through the through hole, a conductive sheet located within the cavity, an inner insulating component separating the conductive sheet and the middle frame, and an outer insulating component separating the positive electrode metal component and the middle frame. The positive electrode metal component includes a positive electrode sheet located outside the middle frame and a connecting post extending from the positive electrode sheet into the middle frame and connected to the conductive sheet. The end of the connecting post passing through the conductive sheet has an outwardly protruding limiting protrusion. The limiting protrusion fixes the conductive sheet, the inner insulating component, and the outer insulating component to the middle frame. The outer insulating component includes a ring portion surrounding the outside of the connecting post, the ring portion extending beyond the electromagnetic shielding layer. The inner insulating component is attached to the electromagnetic shielding layer; or...

[0020] The positive electrode assembly includes a positive electrode post passing through the through hole, an insulating ring surrounding the outside of the positive electrode post, and a flange mounting base surrounding the outside of the insulating ring. The flange mounting base includes a flange ring that fits against the middle frame.

[0021] Furthermore, the area of ​​the connection region is 5 to 40 square millimeters, and the shortest distance D between the connection region and the electromagnetic shielding layer is not less than 0.05 mm.

[0022] Compared with the prior art, the present invention has the following beneficial effects: According to at least one embodiment of the present invention, the solid-state battery includes a shell assembly, a cell disposed in the cavity of the shell assembly, and an electromagnetic shielding layer disposed on the inner wall of the shell assembly. The wall thickness of the shell assembly is 0.02mm to 0.5mm, so that it is lightweight and has good structural strength. The shell assembly is made of alloy material, which itself has a certain electromagnetic shielding performance. At the same time, the electromagnetic shielding layer on the inner wall of the shell assembly can further improve the electromagnetic shielding performance, thereby effectively reducing the interference of external electromagnetic fields on the normal operation of the solid-state battery and improving the reliability of the solid-state battery operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a solid-state battery according to some embodiments of this utility model.

[0024] Figure 2 This is an exploded view of the housing assembly and electromagnetic shielding layer of a solid-state battery according to some embodiments of the present invention, wherein the middle frame and the bottom plate are integrally formed.

[0025] Figure 3 This is an exploded view of the housing assembly and electromagnetic shielding layer of a solid-state battery according to some embodiments of the present invention, wherein the middle frame and the bottom plate are separately arranged.

[0026] Figure 4 This is a front view of a solid-state battery according to some embodiments of this utility model.

[0027] Figure 5 It is along Figure 4 The sectional view obtained by cutting along section line AA.

[0028] Figure 6 It is along Figure 4 A sectional view obtained by cutting along the BB section line.

[0029] Figure 7 This is a schematic diagram of the structure of the middle frame in some embodiments of this utility model.

[0030] Figure 8 This is a schematic diagram of the structure of the middle frame in some embodiments of this utility model.

[0031] Figure 9 This is a schematic diagram of the structure of the middle frame in some embodiments of this utility model.

[0032] Figure 10 This is a schematic diagram of the structure of the battery cell fixing frame in some embodiments of this utility model.

[0033] Figure 11 yes Figure 1 The diagram shows the internal structure of a solid-state battery.

[0034] Figure 12 yes Figure 11 Enlarged view of section II.

[0035] Figure 13 yes Figure 5 Enlarged view of section I in the middle.

[0036] Figure 14 This is a schematic diagram of the connection between the positive electrode component and the middle frame in some embodiments of this utility model.

[0037] Figure 15 This is a schematic diagram of a solid-state battery in some embodiments of the present invention, which is provided with an external positive electrode connector and an external negative electrode connector. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0039] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] like Figures 1 to 6 As shown, this utility model proposes a solid-state battery, which includes a housing assembly 1, a battery cell 2 disposed within the housing assembly 1, and an electromagnetic shielding layer 3 disposed on the inner wall of the battery cell 2.

[0042] The outer casing assembly 1 has a cavity 1a, within which the battery cell 2 and the electromagnetic shielding layer 3 are both disposed. The outer casing assembly 1 is made of an alloy material. Alloy materials have good ductility, facilitating forming through processes such as stamping, and their wall thickness can be made thinner. In some embodiments, the alloy material is stainless steel, and more preferably 316L stainless steel, which also has good ductility. Optionally, the wall thickness of the outer casing assembly 1 is 0.02mm to 0.5mm to achieve a lighter weight and good structural strength.

[0043] The outer casing assembly 1, made of alloy material, has certain electromagnetic shielding performance. At the same time, the electromagnetic shielding layer 3 on the inner wall of the outer casing assembly 1 can further improve the electromagnetic shielding performance. In this way, when the solid-state battery is working, electromagnetic interference can be reduced. For example, it can reduce the interference of external electromagnetic fields on the operation of electronic components inside the solid-state battery, and it can also reduce the interference of the internal electromagnetic field of the solid-state battery on the outside world, thereby improving the reliability of the solid-state battery.

[0044] In some embodiments, the electromagnetic shielding layer 3 is an electromagnetic shielding coating covering the inner wall of the housing assembly 1. For example, the electromagnetic shielding coating is applied to the inner wall of the housing assembly 1 by coating, or by spraying. Existing electromagnetic shielding coatings can be used. In some embodiments, the electromagnetic shielding coating can be made by mixing carbon black and / or graphite as conductive materials with organic resin.

[0045] Optionally, the thickness of the electromagnetic shielding coating is 0.03mm to 0.1mm to ensure good electromagnetic shielding performance without taking up too much space inside the solid-state battery or increasing its weight.

[0046] In some embodiments, the electromagnetic shielding layer 3 is an electromagnetic shielding film attached to the inner wall of the housing assembly 1. The electromagnetic shielding film may be an electromagnetic shielding film in the prior art. In some embodiments, the electromagnetic shielding film includes an insulating sheet (e.g., a polyester film) and a metal mesh or conductive coating disposed on the insulating sheet.

[0047] Optionally, the thickness of the electromagnetic shielding film is 0.08mm to 0.15mm to ensure good electromagnetic shielding performance without taking up too much space inside the solid-state battery or increasing its weight.

[0048] Understandably, the larger the area covered by the electromagnetic shielding layer, the better the electromagnetic shielding effect. To obtain the best possible electromagnetic shielding effect, the electromagnetic shielding layer covers all the inner walls of the outer casing assembly 1.

[0049] The outer casing assembly 1 includes an annular middle frame 10 and a cover plate 11 and a bottom plate 12 respectively connected to the two open ends of the middle frame 10. In some embodiments, the middle frame 10 and the bottom plate 12 are integrally formed, and the cover plate 11 is a separate part, which is connected to the open ends of the middle frame 10 and the bottom plate 12 to form a cavity 1a. In other embodiments, the middle frame 10, the cover plate 11 and the bottom plate 12 are separately arranged and cooperate to form the cavity 1a. The separate middle frame 10, the cover plate 11 and the bottom plate 12 make it easier to set the electromagnetic shielding layer 3. For example, since the surfaces of the cover plate 11 and the bottom plate 12 are relatively flat, it is easier to set the electromagnetic shielding layer on their surfaces. Furthermore, it is also relatively easy to spray or apply electromagnetic shielding coating or attach electromagnetic shielding film to the inner wall of the annular middle frame 10, and it is less likely to form dead corners where it is difficult to set the electromagnetic shielding layer. It is understandable that if the middle frame 10 and the base plate 12 are integrally formed, there may be dead corners at the connection between the two where it is difficult to reliably set the electromagnetic shielding layer 3. This also increases the difficulty of uniformly setting the electromagnetic shielding layer 3, affecting the final electromagnetic shielding effect.

[0050] Optionally, the surfaces of the middle frame 10, cover plate 11 and bottom plate 12 facing the cavity 1a are provided with electromagnetic shielding layers 3 to ensure electromagnetic shielding effect.

[0051] Optionally, the cover plate 11 and the bottom plate 12 do not extend beyond the outer periphery 10a of the middle frame 10, so that the solid-state battery does not form an outwardly protruding flange edge, which can reduce the space occupied by the solid-state battery.

[0052] In some embodiments, the middle frame 10 is annular or elliptical, and its entirety is formed by a curved surface, excluding the corners, which facilitates the electromagnetic shielding layer 3 to fully cover the surface of the middle frame 10. In other embodiments, the middle frame 10 includes a plurality of flat plate portions 100 and arc portions 101 connecting two adjacent plate portions 100, for example, Figure 1 and Figure 7 In the illustrated embodiment, the middle frame 10 is in the shape of a rectangular ring, and includes four flat plate portions 100. Figure 8 In the illustrated embodiment, the middle frame 10 is triangular in shape and includes three flat plate portions 100. Figure 9 In the illustrated embodiment, the middle frame 10 is a U-shaped ring, comprising multiple flat plate portions 100. Optionally, the radius of the arc portion 101 is not less than 0.3 mm to avoid forming excessively small corners, allowing the electromagnetic shielding layer to reliably cover the inner surface of the corners of the middle frame 10, reducing the risk of detachment and providing more comprehensive coverage.

[0053] In some embodiments, the solid-state battery further includes a cell holder 6 located within the cavity 1a and fixedly connected to the housing assembly 1. The cell 2 is connected to the cell holder 6, and the cell holder 6 separates the cell 2 from the electromagnetic shielding layer 3. The cell holder 6 is made of insulating material. The cell holder 6 prevents the cell 2 from contacting the electromagnetic shielding layer 3 or the housing assembly 1, thereby providing insulation protection. Figure 10 and Figure 11 As shown, the battery cell holder 6 is provided with a limiting groove 60 and a claw 61 for holding the battery cell 2. The part of the battery cell holder 6 located outside the limiting groove 60 separates the battery cell 2 from the middle frame 10. The part of the battery cell holder 6 located below the limiting groove 60 separates the battery cell 2 from the base plate 12. The part of the claw 61 is located above the battery cell 2, which can prevent the battery cell holder 6 from contacting the cover plate 11, thereby reliably separating the battery cell 2 from the outer shell 1 and the electromagnetic shielding layer 3.

[0054] In some embodiments, such as Figure 1 and Figure 11 As shown, the solid-state battery also includes a positive electrode assembly 4 connected to the middle frame 10. The positive electrode assembly 4 is electrically connected to the positive electrode of the solid-state battery via an inner positive electrode connector 20, and the middle frame 10 is electrically connected to the negative electrode of the solid-state battery via an inner negative electrode connector 21. Thus, the positive electrode assembly 4 and the outer casing assembly 1 can serve as the positive and negative electrodes of the solid-state battery, respectively. The electromagnetic shielding layer 3 is provided with clearance holes 31 to avoid the connection area between the inner negative electrode connector 21 and the middle frame 10. Further reference... Figure 12 The inner negative electrode connector 21 has a piece 210 that is welded to the middle frame 10. The connection area between the inner negative electrode connector 21 and the middle frame 10 is the contact area between the piece 210 and the middle frame 10. Optionally, the area of ​​the connection area (i.e., the piece 210) is 5 to 40 square millimeters to ensure reliable welding between the inner negative electrode connector 21 and the middle frame 10, thereby reducing resistance. The shortest distance D between the connection area of ​​the inner negative electrode connector 21 and the middle frame 10 and the electromagnetic shielding layer 3 is not less than 0.05 mm to prevent the heat from welding the inner negative electrode connector 21 to the middle frame 10 from affecting the electromagnetic shielding layer 3.

[0055] The middle frame 10 has a through hole 102, and the positive electrode component 4 passes through the through hole 102, with part of it located inside the middle frame 10 and part of it located outside the middle frame 10.

[0056] In some embodiments, such as Figure 13As shown, the positive electrode assembly 4 includes a positive electrode metal member 40 passing through the through hole 102, a conductive sheet 41 located in the cavity 1a, an inner insulating member 43 separating the conductive sheet 41 and the middle frame 10, and an outer insulating member 42 separating the positive electrode metal member 40 and the middle frame 10. The positive electrode metal member 40 includes a positive electrode sheet 400 located outside the middle frame 10 and a connecting post 401 disposed on the positive electrode sheet 400. The connecting post 401 passes through the outer insulating member 42, the side frame 20, and the inner insulating member 43 and is connected to the conductive sheet 41. The material of the positive electrode metal member 40 can be, for example, aluminum, which is electrically connected to the conductive sheet 41. The conductive sheet 41 is used to connect to the inner positive electrode connector 20. The material of the conductive sheet 41 is preferably the same as the material of the positive electrode metal member 40. Optionally, the positive electrode metal part 40 is connected to the middle frame 10 by riveting. Its connecting post 401 passes through the end of the conductive sheet 41 and is riveted to form an outwardly protruding limiting protrusion 402. The limiting protrusion 402 simultaneously fixes the conductive sheet 41, the inner insulating part 53 and the outer insulating part 52 to the middle frame 10.

[0057] The inner insulating member 43 is attached to the electromagnetic shielding layer 3, and the outer insulating member 42 includes a ring portion 420 surrounding the outside of the connecting post 401. The ring portion 420 extends beyond the electromagnetic shielding layer 3 to prevent the electromagnetic shielding layer 3 from contacting the connecting post 401. Optionally, the ring portion 420 extends into the inner insulating member 43 to further ensure the insulation effect.

[0058] In some embodiments, such as Figure 14 As shown, the positive electrode assembly 4 includes a positive electrode post 46 passing through the through hole 102, an insulating ring 44 surrounding the positive electrode post 46, and a flange mounting base 45 surrounding the insulating ring 44. One end of the flange mounting base 45 located inside the middle frame 10 has a protruding flange ring 450. The flange ring 450 is fitted to the inner surface of the middle frame 10, and the two can be connected by means such as adhesive or welding. Optionally, the insulating ring 44 is made of glass, and the positive electrode post 46 is made of molybdenum. It is understood that the flange ring 450 can also be fitted to the outer surface of the middle frame 10.

[0059] like Figure 15 As shown, an external positive electrode connector 70 connected to the positive electrode assembly 4 (e.g., the inner positive electrode connector 20 or the positive electrode post 43) and an external negative electrode connector 71 connected to the outer casing assembly 1 can also be provided to facilitate the wiring of the solid-state battery with external devices. Optionally, the positions of the external negative electrode connector 71 and the inner negative electrode connector 21 correspond to the connection area (i.e., the plate portion 210) of the middle frame 10. For example, the projections of the two on the surface of the middle frame 10 completely or partially overlap, which helps to shorten the current transmission path and improve power supply efficiency.

[0060] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0061] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A solid-state battery, characterized in that, include: The outer shell assembly (1) has a cavity (1a), and the outer shell assembly (1) is made of alloy material with a thickness of 0.02mm to 0.5mm; The battery cell (2) is disposed within the cavity (1a); and, An electromagnetic shielding layer (3) is disposed on the inner wall of the outer shell assembly (1).

2. The solid-state battery as described in claim 1, characterized in that, The electromagnetic shielding layer (3) is an electromagnetic shielding coating that covers the inner wall of the outer shell assembly (1).

3. The solid-state battery as described in claim 2, characterized in that, The thickness of the electromagnetic shielding coating is 0.03 mm to 0.1 mm.

4. The solid-state battery as described in claim 1, characterized in that, The electromagnetic shielding layer (3) is an electromagnetic shielding film attached to the inner wall of the outer shell assembly (1).

5. The solid-state battery as described in claim 4, characterized in that, The thickness of the electromagnetic shielding film is 0.08 mm to 0.15 mm.

6. The solid-state battery as described in claim 1, characterized in that, The outer shell assembly (1) includes an annular middle frame (10) and a cover plate (11) and a bottom plate (12) respectively connected to the two open ends of the middle frame (10). The middle frame (10), the cover plate (11) and the bottom plate (12) are separately arranged and cooperate to form the cavity (1a). The electromagnetic shielding layer (3) is provided on the surface of the middle frame (10), the cover plate (11) and the bottom plate (12) facing the cavity (1a). The outer edges of the cover plate (11) and the bottom plate (12) do not extend beyond the outer peripheral surface (10a) of the middle frame (10).

7. The solid-state battery as described in claim 6, characterized in that, The middle frame (10) includes a plurality of flat plate portions (100) and an arc portion (101) connecting two adjacent plate portions (100), the radius of the arc portion (101) being not less than 0.3mm.

8. The solid-state battery as described in claim 1, characterized in that, It also includes a battery cell holder (6) disposed in the cavity (1a) and fixedly connected to the outer shell assembly (1), wherein the battery cell (2) is connected to the battery cell holder (6), the battery cell holder (6) is made of insulating material and separates the battery cell (2) from the electromagnetic shielding layer (3).

9. The solid-state battery according to any one of claims 1 to 8, characterized in that, The outer casing assembly (1) includes an annular middle frame (10), and the solid-state battery also includes a positive electrode assembly (4) connected to the middle frame (10). The positive electrode assembly (4) is electrically connected to the positive electrode of the solid-state battery through a positive electrode connector (20), and the middle frame (10) and the negative electrode of the solid-state battery are electrically connected through a negative electrode connector (21). The electromagnetic shielding layer (3) is provided with a clearance hole (31) to avoid the connection area between the negative electrode connector (21) and the middle frame (10).

10. The solid-state battery as described in claim 9, characterized in that, The middle frame (10) has a through hole (102); The positive electrode assembly (4) includes a positive electrode metal member (40) passing through the through hole (102), a conductive sheet (41) located in the cavity (1a), an inner insulating member (43) separating the conductive sheet (41) and the middle frame (10), and an outer insulating member (42) separating the positive electrode metal member (40) and the middle frame (10). The positive electrode metal member (40) includes a positive electrode sheet (400) located outside the middle frame (10) and a connector extending from the positive electrode sheet (400) into the middle frame (10) and connected to the conductive sheet (41). A connecting post (401) has a protruding limiting protrusion (402) at its end passing through the conductive sheet (41). The limiting protrusion (402) fixes the conductive sheet (41), the inner insulating member (43), and the outer insulating member (42) to the middle frame (10). The outer insulating member (42) includes a ring (420) surrounding the outside of the connecting post (401), extending beyond the electromagnetic shielding layer (3). The inner insulating member (43) is attached to the electromagnetic shielding layer (3). Alternatively, The positive electrode assembly (4) includes a positive electrode post (46) passing through the through hole (102), an insulating ring (44) surrounding the outside of the positive electrode post (46), and a flange mounting base (45) surrounding the outside of the insulating ring (44). The flange mounting base (45) includes a flange ring (450) that fits against the middle frame (10).

11. The solid-state battery as described in claim 9, characterized in that, The area of ​​the connection region is 5 to 40 square millimeters, and the shortest distance D between the connection region and the electromagnetic shielding layer (3) is not less than 0.05 mm.

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