Wedge-shaped pressurized and packaged solid-state lithium battery, movement mechanism and vehicle

Abstract

The utility model discloses a solid-state lithium battery packaged by wedge-shaped pressurization, a movement mechanism and a vehicle, the solid-state lithium battery packaged by wedge-shaped pressurization comprises a shell, a solid-state lithium battery module is arranged in the shell, and a wedge-shaped pressurization device is arranged above the solid-state lithium battery module; the wedge-shaped pressurizing device comprises an upper pressing plate and a lower pressing plate, the upper pressing plate and the lower pressing plate are of wedge-shaped structures, and the inclined face of the upper pressing plate is matched with the inclined face of the lower pressing plate. The upper end face of the upper pressing plate makes contact with the inner top wall of the shell. A through hole is formed in the upper pressing block, and a bolt is arranged in the through hole in a penetrating mode. According to the solid-state lithium battery pressurizing structure, the pressurizing process of the solid-state battery module is realized by designing the wedge-shaped pressurizing device, the bolt tension can be amplified through the two pressurizing plates, meanwhile, reverse friction self-locking can be realized, and the problem of pressure vibration attenuation or aging attenuation of the solid-state lithium battery pressurizing structure can be effectively avoided.

Description

Technical Field

[0001] This utility model belongs to the field of solid-state battery packaging technology, specifically relating to a wedge-shaped pressurized solid-state lithium battery, a motion mechanism, and a vehicle. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] Solid-state lithium batteries are lithium-ion batteries that use solid electrolytes. Compared with liquid electrolyte lithium batteries, they have characteristics such as being non-flammable, non-corrosive, non-volatile, and resistant to high temperatures. They also have significant advantages in safety and energy density compared to liquid batteries, and have attracted widespread attention from countries around the world.

[0004] The use of a pressurized structure in solid-state lithium battery packaging is based on the following necessity:

[0005] (1) Ensure component contact: The pressurized structure applies pressure to make the positive electrode, negative electrode and electrolyte and other components inside the battery in close contact, thereby reducing resistance and improving conductivity.

[0006] (2) To prevent leakage, although solid electrolytes are not easy to flow, pressurization can reduce the sealing gap and prevent electrolyte migration or leakage.

[0007] (3) Improved performance: Good contact and sealing can improve the energy density, cycle life and rate performance of the battery;

[0008] (4) Manufacturing process requirements: The pressurized structure helps to fix the shape of the battery and prevents the structure from loosening or deforming due to insufficient pressure during the packaging process.

[0009] In summary, pressurized structures are a key technology in solid-state lithium battery packaging, and are crucial to the stability and reliability of the battery.

[0010] Existing solid-state lithium battery module packaging methods are relatively simple. For example, the technical solution disclosed in patent publication number JP6801737B2 uses side plates as pull plates for support during solid-state lithium battery module packaging. The end plates are tightened by bolts at both ends to apply pressure to the stacked battery pack. This method of pressurization structure is simple, but solid-state lithium battery packaging requires high pressure, thus requiring a robust structure. Furthermore, in applications such as solid-state lithium batteries being installed in vehicles, the overall structure vibrates. If the pressurization and packaging are not properly secured, the pressure will decrease due to vibration and time-related degradation. Utility Model Content

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wedge-shaped pressurized solid-state lithium battery, a motion mechanism, and a vehicle. By designing a wedge-shaped pressurization device, the pressurization process of the solid-state battery module is realized. The bolt tension can be amplified through the two pressurization plates, and the reverse friction self-locking can be achieved. This can effectively avoid the problems of pressure vibration attenuation or time-related attenuation in the pressurization structure of the solid-state lithium battery.

[0012] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0013] This utility model provides a wedge-shaped pressurized solid-state lithium battery, comprising: a housing, a solid-state lithium battery module disposed inside the housing, and a wedge-shaped pressurizing device disposed above the solid-state lithium battery module; the wedge-shaped pressurizing device includes an upper pressure plate and a lower pressure plate, the upper pressure plate and the lower pressure plate having a wedge-shaped structure, and the inclined surfaces of the upper pressure plate and the lower pressure plate cooperating with each other; the upper upper surface of the upper pressure plate contacts the inner top wall of the housing; the upper pressure plate has a through hole, and a bolt passes through the through hole.

[0014] In at least one embodiment, the lower pressure plate has a symmetrical wedge-shaped structure, with a flat lower end face and an upper end face composed of two inclined surfaces; there are two upper pressure plates, which respectively cooperate with the two inclined surfaces of the lower pressure plate; the two upper pressure plates are connected by bolts.

[0015] In at least one embodiment, a through-type limiting groove is provided between the two inclined surfaces of the lower pressure plate.

[0016] In at least one embodiment, the left and right sides of the housing are provided with through holes, the size of which is larger than the outer diameter of the bolt nut.

[0017] In at least one embodiment, the lower end face of the lower pressure plate is a plane, and the upper end face is an inclined plane; there is one upper pressure plate, and its inclined plane cooperates with the inclined plane of the lower pressure plate; a through hole is opened on the left or right side wall of the housing, and the size of the through hole is smaller than the outer diameter of the bolt head.

[0018] In at least one embodiment, a buffer structure is provided between the pressure plate and the solid-state battery module.

[0019] In at least one embodiment, the buffer structure is made of soft rubber or plastic; or, the buffer structure is a stacked spring assembly or a spring series / parallel assembly structure.

[0020] In at least one embodiment, the housing is provided with a side plate.

[0021] The beneficial effects of the above-described technical solution of this utility model are as follows:

[0022] 1) The wedge-shaped pressurized solid-state lithium battery of this utility model adopts a wedge structure for the pressurizing device. The two upper pressure plates are driven to move synchronously towards the middle by tightening the bolts. Through the mutual cooperation of the inclined surfaces of the upper and lower pressure plates, the upper pressure plate pushes the lower pressure plate downward, thereby realizing the pressurization process of the solid-state lithium battery module. The bolt tension can be amplified through the two pressure plates. At the same time, it can realize reverse friction self-locking. After self-locking, unless manually unlocked, even if the bolt is no longer under force, the reaction force of the battery cannot push open the pressurizing structure and cause the pressurization to fail. It can effectively avoid the problem of pressure vibration decay or time decay of the pressurizing structure of solid-state lithium batteries.

[0023] 2) This utility model uses a wedge-shaped pressurizing device to pressurize the solid-state lithium battery module, which can more effectively disperse the force and avoid local stress concentration, thereby reducing the risk of structural damage due to overload. At the same time, the wedge-shaped pressurizing structure can withstand a larger load under the same size and exhibits better stability when facing dynamic loads, effectively improving the safety and reliability of the overall structure and extending the service life of the solid-state lithium battery.

[0024] 3) The wedge-shaped pressurizing device adopted by this utility model can better adapt to different types of load conditions. Moreover, the wedge-shaped component is easier to install and disassemble, simplifying the maintenance process. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0026] Figure 1 This is a schematic diagram of the overall structure of a wedge-shaped pressurized packaged solid-state lithium battery according to this utility model;

[0027] Figure 2 This is an exploded view of the overall structure of a wedge-shaped pressurized solid-state lithium battery according to this utility model;

[0028] Figure 3 This is a schematic diagram of the wedge-shaped pressurization device for a wedge-shaped pressurized solid-state lithium battery according to the present invention;

[0029] Figure 4 This is a schematic diagram of the upper pressure plate of a wedge-shaped pressure-encapsulated solid-state lithium battery according to this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of a wedge-shaped pressure-encapsulated solid-state lithium battery according to the present invention.

[0031] In the diagram: 1 is the casing; 2 is the side plate; 3 is the solid-state lithium battery module; 4 is the buffer structure; 5 is the wedge-shaped pressurizing device; 51 is the upper pressure plate; 52 is the bolt; 53 is the lower pressure plate; 54 is the nut.

[0032] The distances or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only. Detailed Implementation

[0033] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] For ease of description, the words "up," "down," "left," and "right" appearing in this utility model only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings. They do not limit the structure and are merely for the purpose of facilitating the description of this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0036] Wedge Structure: A wedge structure is a geometric shape with a trapezoidal or triangular cross-section, narrower at one end and wider at the other. In solid-state lithium batteries, wedge structures can be used to achieve uniform pressure distribution.

[0037] Solid-state lithium battery: A solid-state lithium battery is a type of lithium battery that uses a solid electrolyte instead of a traditional liquid electrolyte. The main purpose of pressurization is to ensure good contact and tight fit between the various parts of the solid-state lithium battery, thereby improving the battery's performance and lifespan.

[0038] As described in the background section, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a wedge-shaped pressurized solid-state lithium battery, a motion mechanism, and a vehicle. By designing a wedge-shaped pressurization device to achieve the pressurization process of the solid-state battery module, the bolt tension can be amplified through the two pressurization plates, and at the same time, reverse friction self-locking can be achieved, which can effectively avoid the problems of pressure vibration attenuation or time-related attenuation in the pressurization structure of the solid-state lithium battery.

[0039] Example 1

[0040] In a typical embodiment of this utility model, such as Figure 1 As shown, this embodiment discloses a wedge-shaped pressurized solid-state lithium battery, including: a housing 1, a solid-state lithium battery module 3 disposed inside the housing 1, and a wedge-shaped pressurizing device 5 disposed above the solid-state lithium battery module 3.

[0041] In this embodiment, the solid-state lithium battery module 3 is a module composed of stacked solid-state lithium battery cells. It is fixedly installed inside the housing 1 by bolts 52 at the bottom. A wedge-shaped pressure device 5 is provided on the upper part. When the solid-state lithium battery module 3 is packaged, the wedge-shaped pressure device 5 is used for packaging and pressurizing.

[0042] like Figures 2-5 As shown, the wedge-shaped pressurizing device 5 includes an upper pressure plate 51 and a lower pressure plate 53. Both the upper and lower pressure plates 51 and 53 are wedge-shaped, and their inclined surfaces cooperate with each other. The upper end face of the upper pressure plate 51 is a flat surface that is always in contact with the inner top wall of the housing 1. Simultaneously, a through hole is formed in the upper pressure plate, through which a bolt 52 passes. Tightening the bolt 52 causes the upper pressure plate to move. Because the upper end face of the upper pressure plate 51 is always in contact with the inner top wall, forming a structural limit, during the movement of the upper pressure plate 51 caused by tightening the bolt 52, the inclined surface structures of the upper and lower pressure plates 53 cooperate, realizing the overall downward movement of the lower pressure plate 53, thereby achieving the pressurization process.

[0043] like Figure 5 As shown, the lower pressure plate 53 in this embodiment has a symmetrical wedge-shaped structure. Its lower end face is a plane, and its upper end face is composed of two inclined surfaces. For this purpose, two upper pressure plates 51 are provided, which respectively cooperate with the two inclined surfaces of the lower pressure plate 53. The two upper pressure plates 51 are connected by bolts 52. By rotating the bolts 52 or the nuts 54, the two upper pressure plates 51 can be driven to move towards the middle synchronously. During the process of the two upper pressure plates 51 moving towards the middle, the lower pressure plate 53 moves down as a whole to realize the pressurization process.

[0044] By setting the pressurizing device as a wedge-shaped structure, the force can be more effectively dispersed, avoiding local stress concentration and thus reducing the risk of damage to the pressurized structure due to overload. Through optimized shape and material selection, the wedge-shaped pressurization structure can withstand a larger load within the same size and exhibits better stability under dynamic loads, effectively improving the safety and reliability of the pressurized structure. Moreover, the wedge-shaped pressurizing device 5 can better adapt to different types of load conditions, and its geometric parameters (such as wedge angle and inclined plane length) can be adjusted according to specific application scenarios to achieve optimal performance.

[0045] In addition, due to factors such as the material or roughness of the inclined surfaces of the upper and lower pressure plates 53, the wedge-shaped pressurizing device 5 itself can provide a certain self-locking effect. After the pressurization operation is completed, the upper end face of the upper pressure plate 51 is completely attached to the inner top wall of the housing 1, and the inclined surface of the upper pressure plate 51 is completely attached to the inclined surface of the lower pressure plate 53. The interaction force between the components can further enhance the self-locking performance of the wedge-shaped pressurizing device 5, which can prevent movement or displacement under the action of external force and avoid the problem of pressure vibration attenuation or time-related attenuation in the pressurization structure of solid-state lithium batteries.

[0046] The wedge-shaped pressurizing device 5 provided in this embodiment can design the wedge angle α of the upper pressure plate 51 and the lower pressure plate 53. The smaller the wedge angle α, the greater the frictional force on the contact surface of the upper pressure plate 51 and the lower pressure plate 53. Selecting an appropriate wedge angle design according to actual needs can reduce the frictional resistance between the contact surfaces, thereby reducing energy loss.

[0047] Furthermore, a through-type limiting groove is provided between the two inclined surfaces of the lower pressure plate 53, which can accommodate the bolt 52, while saving vertical space, making the spatial arrangement more reasonable and the internal arrangement of the housing 1 more compact.

[0048] Furthermore, through holes are provided on the left and right sides of the housing 1. The size of the through holes is larger than the outer diameter of the nut 54 of the bolt 52, which can ensure that the nut 54 of the bolt 52 and the head of the bolt 52 can pass through. This allows the bolt 52 and nut 54 to be turned with a wrench outside the housing 1 to complete the pressure operation.

[0049] As an alternative implementation, the size of the two upper pressure plates 51 can be appropriately reduced so that the bolt 52 can still be accommodated inside the housing 1 after passing through the two upper pressure plates 51. In this way, it is possible to choose not to open holes on the left and right side walls of the housing 1, but to directly rotate the bolt 52 or nut 54 inside the housing 1, which can ensure that the solid-state lithium battery has better sealing after packaging.

[0050] Furthermore, a buffer structure 4 is provided between the solid-state lithium battery module 3 and the lower pressure plate 53 of the wedge-shaped pressurizing device 5. This buffer structure 4 can be made of soft rubber or plastic, or it can be a stacked spring assembly or a series / parallel spring assembly. By providing the buffer structure 4, during the encapsulation pressurization process, the lower pressure plate 53 transmits pressure to the buffer structure 4. The buffer structure 4, through its relatively soft material properties, evenly transmits the pressure to the solid-state lithium battery module 3, ensuring that the encapsulated solid-state battery is subjected to uniform pressure and is essentially operating under isostatic pressure conditions. The high-pressure encapsulation of solid-state lithium batteries is primarily to: eliminate interfacial porosity, ensure close contact between the electrodes and electrolyte, improve ion conductivity, suppress lithium dendrite formation, and enhance structural stability. High pressure and uniform pressurization can achieve uniform densification of the material in all directions, eliminate local stress concentration, and ensure consistent battery performance.

[0051] Furthermore, the front and rear sides of the housing 1 are provided with side plates 2. The side plates 2 can be installed before or after the pressurization operation, which can encapsulate the battery stacking structure to form a closed structure and seal the pressurization structure to ensure safe use.

[0052] The pressurizing device in this embodiment adopts a wedge structure. Tightening the bolt 52 drives two upper pressure plates 51 to move synchronously towards the center. Through the interaction of the inclined surfaces of the upper pressure plate 51 and the lower pressure plate 53, the upper pressure plate 51 pushes the lower pressure plate 53 downwards, thereby pressurizing the solid-state lithium battery module 3. The advantage of this method is that the tension of the bolt 52 is amplified through the two pressure plates. The amplification factor is related to the wedge structure angle α. By adjusting the angle α, different amplification factors and reverse friction self-locking can be achieved. After self-locking, unless manually unlocked, even if the bolt 52 is no longer under force, the battery's reaction force cannot push open the pressurizing structure, thus preventing pressurization failure. This effectively avoids the problems of pressure vibration attenuation or time-related degradation in the solid-state lithium battery pressurizing structure.

[0053] Example 2

[0054] In one typical embodiment of this utility model, this embodiment discloses another structure of a wedge-shaped pressurized solid-state lithium battery. Unlike the wedge-shaped pressurizing device 5 in Embodiment 1, which uses a symmetrical wedge-shaped lower pressure plate 53 and two upper pressure plates 51, the lower end face of the lower pressure plate 53 in this embodiment is flat, and the upper end face is an inclined plane. The upper pressure plate 51 is a single plate, its upper end face being a flat plane completely fitted to the inner top wall of the housing 1. Its inclined plane cooperates with the inclined plane of the lower pressure plate 53. A through hole is opened on the left or right side wall of the housing 1, the size of which is smaller than the outer diameter of the bolt head 52, allowing one side of the bolt 52 to be fixed. When pressurization is required, tightening the nut 54 of the bolt 52 moves the upper pressure plate 51 towards the bolt head 52. Through the interaction of the contact surfaces of the upper pressure plate 51 and the lower pressure plate 53, the lower pressure plate 53 moves downward as a whole, thus achieving the pressurization process.

[0055] Example 3

[0056] In a typical embodiment of this utility model, a motion mechanism is disclosed, which adopts a wedge-shaped pressurized solid-state lithium battery as described in Embodiment 1 or Embodiment 2. The solid-state lithium battery includes a housing 1, and a solid-state lithium battery module 3 is disposed inside the housing 1. A wedge-shaped pressurizing device 5 is disposed above the solid-state lithium battery module 3. The wedge-shaped pressurizing device 5 includes an upper pressure plate 51 and a lower pressure plate 53, which are wedge-shaped structures, and the inclined surfaces of the upper pressure plate 51 and the lower pressure plate 53 cooperate with each other. The upper end face of the upper pressure plate 51 contacts the inner top wall of the housing 1. A through hole is opened in the upper pressure block, and a bolt 52 passes through the through hole.

[0057] Example 4

[0058] In a typical embodiment of this utility model, this embodiment discloses a vehicle that uses a wedge-shaped pressurized solid-state lithium battery as described in Embodiment 1 or Embodiment 2. The solid-state lithium battery includes a housing 1, and a solid-state lithium battery module 3 is disposed inside the housing 1. A wedge-shaped pressurizing device 5 is disposed above the solid-state lithium battery module 3. The wedge-shaped pressurizing device 5 includes an upper pressure plate 51 and a lower pressure plate 53, which are wedge-shaped structures, and the inclined surfaces of the upper pressure plate 51 and the lower pressure plate 53 cooperate with each other. The upper end face of the upper pressure plate 51 contacts the inner top wall of the housing 1. A through hole is opened in the upper pressure plate, and a bolt 52 passes through the through hole.

[0059] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wedge-shaped pressurized solid-state lithium battery, characterized in that, include: The housing contains a solid-state lithium battery module, and a wedge-shaped pressurizing device is positioned above the solid-state lithium battery module. The wedge-shaped pressurizing device includes an upper pressure plate and a lower pressure plate, which are wedge-shaped structures, and their inclined surfaces cooperate with each other. The upper upper surface of the upper pressure plate contacts the inner top wall of the housing. The upper pressure block has a through hole through which a bolt passes.

2. A wedge-shaped pressurized solid-state lithium battery as described in claim 1, characterized in that, The lower pressure plate has a symmetrical wedge-shaped structure, with a flat lower end and an upper end composed of two inclined surfaces; there are two upper pressure plates, which respectively cooperate with the two inclined surfaces of the lower pressure plate; the two upper pressure plates are connected by bolts.

3. A wedge-shaped pressurized solid-state lithium battery as described in claim 2, characterized in that, A through-type limiting groove is provided between the two inclined surfaces of the lower pressure plate.

4. A wedge-shaped pressurized solid-state lithium battery as described in claim 2, characterized in that, The left and right walls of the housing have through holes, the size of which is larger than the outer diameter of the bolt nut.

5. A wedge-shaped pressurized solid-state lithium battery as described in claim 1, characterized in that, The lower end face of the lower pressure plate is flat, and the upper end face is an inclined plane; there is one upper pressure plate, and its inclined plane cooperates with the inclined plane of the lower pressure plate; a through hole is opened on the left or right side wall of the housing, and the size of the through hole is smaller than the outer diameter of the bolt head.

6. A wedge-shaped pressurized solid-state lithium battery as described in claim 1, characterized in that, A buffer structure is provided between the pressure plate and the solid-state battery module.

7. A wedge-shaped pressurized solid-state lithium battery as described in claim 6, characterized in that, The buffer structure is made of soft rubber or plastic; or, the buffer structure is a stacked spring assembly or a spring series / parallel assembly structure.

8. A wedge-shaped pressurized solid-state lithium battery as described in claim 1, characterized in that, The housing is provided with side plates.

9. A motion mechanism, characterized in that, A wedge-shaped pressurized packaged solid-state lithium battery as described in any one of claims 1-8.

10. A vehicle, characterized in that, A solid-state lithium battery with a wedge-shaped pressurized package as described in any one of claims 1-8 is used.

Images