A cylindrical solid-state battery

Abstract

The utility model provides a kind of cylindrical solid-state battery, it is related to solid-state battery technical field, including cover, platen and frame, frame is arranged between cover and platen, and cover, platen and frame are the cylindrical shell structure of encapsulation molding;Frame inside is filled with and is provided with inner arc piece, and frame is reserved the space of inner arc piece flexure, and the longitudinal direction structure of inner arc piece sheet material both ends corresponds with frame;Structure is based on the cylindrical encapsulation form to the winding core is encapsulated integration, structure is on the basis of traditional cylindrical shell structure, by the cover, frame and platen structure of upper and lower combination encapsulation as main body, and in which structure connection place is filled with and is provided with inner arc piece and upper and lower difference and is combined with extension piece, gasket to carry out internal unified encapsulation, so that inner shell space meets winding core encapsulation performance, while, can use the telescopic structure of inner arc piece upper and lower both ends to adapt the expansion and contraction change of winding core structure when charging and discharging.

Description

Technical Field

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

[0002] Solid-state batteries are a type of battery technology that differs from the commonly used lithium-ion and lithium-ion polymer batteries. Solid-state batteries use solid electrodes and solid electrolytes. Because solid electrolytes replace electrolytes and separators, they have higher thermal stability and do not experience internal short circuits. At the same time, solid electrolytes have higher intrinsic safety.

[0003] Solid-state batteries are packaged in three forms: pouch, prismatic, and cylindrical. Each has its own advantages and disadvantages. Cylindrical packaging uses inner and outer layered wound cathode and anode materials and solid electrolyte as the cell structure. The structure itself has reliable voltage resistance to cope with the expansion of the positive and negative electrodes during charging and discharging. However, because the package shell is fixed, the expansion and contraction space reserved between the wound cells can easily affect the winding layers of the cells, causing changes in the solid-solid gaps between the cathode, anode materials, and solid electrolyte, thereby affecting the internal resistance of the battery.

[0004] Based on this, this utility model provides an effective solution to the problem that the existing cylindrical solid-state battery structure easily affects the cell structure during the expansion and contraction of the positive and negative electrodes during charging, thereby causing fluctuations in internal resistance. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing cylindrical solid-state battery packaging structure relies only on the internal reserved space when dealing with the expansion and contraction changes of the positive and negative electrodes during charging and discharging, and lacks a targeted structure to deal with the changes in the internal resistance of the battery. In view of the problems of the existing technology, a cylindrical solid-state battery is provided.

[0006] The purpose and effect of this utility model are achieved by the following specific technical means: including a cover, a pressure plate and a frame, wherein the frame is disposed between the cover and the pressure plate, and the cover, the pressure plate and the frame are a cylindrical shell structure formed by encapsulation.

[0007] The inner side of the frame is filled with an inner arc sheet, and the frame has reserved space for the inner arc sheet to bend, and the two ends of the inner arc sheet correspond to the longitudinal structure of the frame.

[0008] An extension piece and a pad are respectively provided between the cover, the pressure plate and the frame. Both ends of the inner arc sheet are extended and fixed with guide tubes, and the guide tubes at both ends are respectively combined with the extension piece and the pad.

[0009] Furthermore: the shell structure of the frame is encapsulated with a winding core.

[0010] A further preferred embodiment: the cap has a positive end structure with upper and lower layers separated, the positive end portion is protruding on the cap, and a through hole is left between the cap and the extension piece.

[0011] A further preferred embodiment: the pressure plate and the pad are a combined structure formed by stacking, and an arched space is left between the pressure plate and the pad for expansion and contraction.

[0012] A further preferred embodiment: the end of the catheter extends outward to form a sliding core, and the sliding core is seamlessly inserted into the extension piece and the pad, and a guide and limiting ring is formed on the outer side of the connection end of the sliding core with the extension piece and the pad.

[0013] A further preferred embodiment: the thickness of the outer frame surface is relatively smaller than that of the inner frame surface, and the outer frame surface is encapsulated with an outer film.

[0014] The beneficial effects of this utility model are:

[0015] This cylindrical solid-state battery is based on a cylindrical encapsulation method for integrating a wound core. Building upon the traditional cylindrical shell structure, it utilizes a combination of upper and lower encapsulated caps, frames, and pressure plates as its main components. Internally, it employs inner arc sheets and differentially fitted extension sheets and pads at the structural connections to achieve unified encapsulation. This allows the inner shell space to meet the performance requirements of the wound core encapsulation while utilizing the expandable structures at the upper and lower ends of the inner arc sheets to accommodate the expansion and contraction changes of the wound core during charging and discharging. This maintains the relative compression between the anode and cathode layers and the solid electrolyte within the wound core, ensuring the stability of the overall battery internal resistance and improving the safety and stability of the solid-state battery. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal planar structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the planar structure of the connection between the pad and the conduit in this utility model;

[0020] Figure 4 This is a schematic diagram of the planar structure of the catheter of this utility model.

[0021] Figures 1-4 In the middle: 1. Cap, 2. Core, 3. Pressure plate, 4. Outer film, 5. Frame, 6. Extension piece, 7. Guide tube, 8. Inner arc piece, 9. Gasket, 10. Sealing layer, 11. Spacer, 12. Sliding shaft core, 13. Limiting ring. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the following description is provided in conjunction with the accompanying drawings. Figures 1-4 The present invention will be further described in detail below with specific embodiments. The following embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any modifications and refinements made without departing from the scope of the present invention are within the patent protection scope of the present invention.

[0023] A cylindrical solid-state battery includes a cover 1, a pressure plate 3 and a frame 5, the frame 5 being disposed between the cover 1 and the pressure plate 3, and the cover 1, the pressure plate 3 and the frame 5 being a cylindrical shell structure formed by encapsulation.

[0024] The inner side of the frame 5 is filled with an inner arc sheet 8. The frame 5 has reserved space for the inner arc sheet 8 to bend, and the two ends of the inner arc sheet 8 correspond to the longitudinal structure of the frame 5.

[0025] An extension piece 6 and a pad 9 are respectively provided between the cover 1, the pressure plate 3 and the frame 5. Both ends of the inner arc piece 8 are extended and fixed with guide tubes 7, and the two end guide tubes 7 are respectively combined with the extension piece 6 and the pad 9.

[0026] In this cylindrical solid-state battery, such as Figure 1 , 2 As shown, the structure is connected by a cover 1 and a pressure plate 3 as the upper and lower encapsulation structures of the frame 5, forming the entire cylindrical shell structure. The exterior of the structure is seamlessly joined, and the interior is further separated by extension pieces 6 and pads 9, which are layered with the cover 1 and pressure plate 3. These are combined with the inner arc pieces 8 filled in the frame 5 to form a whole, completing the sealing of the internal encapsulation shell. Compared with the traditional cylindrical encapsulation shell, the inner arc pieces 8 inside this shell are connected to the extension pieces 6 and pads 9 through conduits 7 extending from both ends. This gives the curvature of the inner arc pieces 8 a certain degree of extensibility in the lateral direction, adapting to the anode and cathode. The expansion and contraction of the solid electrolyte material during charging and discharging affects the packaging structure itself, while also taking into account the pressure resistance of the cylindrical solid battery outer packaging, thus improving the safety of the structure. In the longitudinal direction, the expansion and contraction of the cell material during charging and discharging will act on the reserved space between the cover 1 and the pressure plate 3, and indirectly act on the extension piece 6 and the pad 9. The spacing between the upper and lower extension pieces 6 and the pad 9 is maintained by the curvature of the inner arc piece 8. Thus, while making changes to the expansion and contraction of the cell material, it also effectively maintains the compression of the cell material, avoiding the situation where fluctuations in the contact tightness between the solid materials of the cell structure affect the internal resistance.

[0027] Compared to traditional wiring methods, the cylindrical structure of this solid-state battery, based on a cylindrical packaging form, utilizes an internal combination of an extension sheet 6, a pad 9, and an inner arc sheet 8 to further complete the packaging shell of the entire frame 5. The inner and outer packaging are independent of each other, ensuring the sealing of the shell. At the same time, its inner packaging structure can adapt to the expansion and contraction changes of the cell material during charging and discharging, effectively ensuring the compression state of the entire cell structure and avoiding the impact of internal resistance fluctuations on the cell life and stability.

[0028] Furthermore, the shell structure of the frame 5 encapsulates the core 2, which serves as the cell winding structure of the solid-state battery. The anode, cathode, and solid electrolyte of relative density are selected as the winding structure according to the packaging process.

[0029] Furthermore, the cap 1 has a positive end structure with upper and lower layers for isolation. A positive end portion protrudes from the cap 1, and a through hole is provided between the cap 1 and the extension piece 6. Figure 2 As shown, the cover 1 and the extension piece 6 are internal and external encapsulations of each other. The extension piece 6 is used to further seal the combined end of the cover 1 and the frame 5. In conjunction with the connection between the end of the inner arc piece 8 and the extension piece 6, the integrity and structural strength of the entire inner encapsulation structure are improved.

[0030] Based on the above, the pressure plate 3 and the pad 9 are a combined structure formed by stacking, and an arched space is left between the pressure plate 3 and the pad 9 for expansion and contraction, such as... Figure 2 As shown, the pad 9 is used as the inner encapsulation structure of the pressure plate 3 to further seal the combined end of the pressure plate 3 and the frame 5. At the same time, the connection between the end of the inner arc piece 8 and the pad 9 is used to improve the integrity and structural strength of the entire inner encapsulation structure.

[0031] Furthermore, a sliding core 12 extends outward from the end of the catheter 7, and the sliding core 12 is seamlessly inserted into the extension piece 6 and the pad 9. A guide and limiting ring 13 is formed on the outer side of the connection end between the sliding core 12 and the extension piece 6 and the pad 9. Figure 4 As shown, the sliding core 12 and the limiting ring 13 serve as a refined structure for the end of the conduit 7 and the extension piece 6 and the pad 9. Their axial movement is used to adapt to the curved state of the inner arc piece 8. In conjunction with the axial expansion and contraction of the conduit 7 at both ends of the inner arc piece 8, the joint spacing with the extension piece 6 and the pad 9 is changed, thereby dynamically adapting to the deformation caused by the expansion and contraction of the battery cell material. At the same time, the limiting ring 13 is further used to improve the accuracy of the axial expansion and contraction of the conduit 7.

[0032] Furthermore, the outer frame of the frame 5 is relatively thinner than the inner frame, and the outer frame of the frame 5 is encapsulated with an outer film 4. The outer film 4 is used to further solve the problem of limited pressure resistance of the frame 5 due to the internal filling structure.

Claims

1. A cylindrical solid-state battery, characterized in that: It includes a cover (1), a pressure plate (3) and a frame (5), wherein the frame (5) is disposed between the cover (1) and the pressure plate (3), and the cover (1), the pressure plate (3) and the frame (5) are a cylindrical shell structure formed by encapsulation; The inner side of the frame (5) is filled with an inner arc sheet (8), and the frame (5) has a reserved space for the inner arc sheet (8) to bend, and the two ends of the inner arc sheet (8) correspond to the longitudinal structure of the frame (5). An extension piece (6) and a pad (9) are respectively provided between the cover (1), the pressure plate (3) and the frame (5). Both ends of the inner arc piece (8) are extended and fixed with guide tubes (7), and the guide tubes (7) at both ends are combined with the extension piece (6) and the pad (9) respectively.

2. The cylindrical solid-state battery according to claim 1, characterized in that: The shell structure of the frame (5) contains a core (2).

3. A cylindrical solid-state battery according to claim 1, characterized in that: The cover (1) is a positive end structure with upper and lower layers separated. The positive end part is formed by protrusion on the cover (1). A through hole is left between the cover (1) and the extension piece (6).

4. A cylindrical solid-state battery according to claim 1, characterized in that: The pressure plate (3) and the pad (9) are a combined structure, and there is an arched space between the pressure plate (3) and the pad (9) for expansion and contraction.

5. A cylindrical solid-state battery according to claim 1, characterized in that: The end of the conduit (7) extends outward to form a sliding core (12), and the sliding core (12) is seamlessly inserted into the extension piece (6) and the pad (9). Furthermore, a guide and limiting ring (13) is formed on the outside of the connection end of the sliding core (12) with the extension piece (6) and the pad (9).

6. A cylindrical solid-state battery according to claim 1, characterized in that: The outer frame of the frame (5) is relatively thinner than the inner frame, and the outer frame of the frame (5) is encapsulated with an outer film (4).

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