A safe solid-state lithium-ion battery

Abstract

This invention relates to a safe solid-state lithium-ion battery, belonging to the field of rechargeable battery technology. Existing lithium-ion battery buffer structures severely neglect the oscillating impacts commonly present in complex dynamic environments, causing the lithium-ion battery to be subjected to these impacts over a long period, thus affecting its normal use. The invention includes: a mounting frame; a buffer shell slidably connected to the upper side of the mounting frame, the inner surface of which is a first annular curved surface; a fixed shell disposed within the buffer shell, the outer surface of which is a second annular curved surface, the first annular curved surface of the buffer shell and the second annular curved surface of the fixed shell being concentric spherical surfaces; and a battery body installed within the fixed shell. This invention, by allowing the fixed shell to oscillate within the buffer shell, avoids the oscillating impact force on the mounting frame acting simultaneously on both the fixed shell and the battery body, reducing the direct impact force on the battery body and improving its safety.

Description

Technical Field

[0001] This invention relates to the field of secondary battery technology, and more particularly to a safe solid-state lithium-ion battery. Background Technology

[0002] Lithium-ion batteries, especially safety batteries using solid electrolytes, have become an important development direction for next-generation energy storage devices due to their high energy density, thermal stability and intrinsic safety. To ensure the structural integrity and electrochemical performance of batteries during transportation and use, existing technologies generally set a fixed shell on the outside of the battery cell or module and integrate a buffer structure to cope with external mechanical impacts.

[0003] Current mainstream buffer design approaches focus on dealing with longitudinal (axial / Z-axis) impacts (such as drops and vertical bumps) and circumferential (radial / XY plane) impacts (such as crushing and side collisions). However, when cars equipped with lithium-ion batteries drive on unpaved roads, speed bumps, or roads with continuous potholes, the vehicle body often experiences significant pitching and rolling swaying in addition to vertical vibrations. This is especially true for lithium-ion batteries installed on ships, which are subjected to even greater swaying amplitudes, far exceeding the vibration environment of ordinary land vehicles. Existing buffer structures seriously neglect the swaying impacts that are common in complex dynamic environments, causing lithium-ion batteries to be subjected to swaying impacts for a long time, thus affecting their normal use. Summary of the Invention

[0004] To overcome the shortcomings of existing lithium-ion batteries in mitigating the impact of swaying, this invention provides a buffered, safe solid-state lithium-ion battery.

[0005] The technical solution of this invention is: a safe solid-state lithium-ion battery, comprising:

[0006] Fixture;

[0007] A buffer shell is slidably connected to the upper side of the fixed frame, and its inner surface is a first annular curved surface;

[0008] A fixed shell is disposed inside the buffer shell, and its outer surface is a second annular curved surface. The first annular curved surface of the buffer shell and the second annular curved surface of the fixed shell are concentric spheres.

[0009] The battery body is installed inside the fixed housing;

[0010] A deceleration assembly is disposed between the fixed frame and the fixed shell to reduce the swing speed of the fixed shell.

[0011] Furthermore, a first spring is fixedly connected between the buffer shell and the fixing frame.

[0012] Furthermore, the inner surface of the buffer shell is rotatably connected with uniformly distributed balls, all of which are in contact with the outer surface of the fixed shell.

[0013] Furthermore, the diameter of the upper side of the inner surface of the buffer shell is smaller than the maximum diameter of the outer surface of the fixed shell.

[0014] Furthermore, the deceleration assembly includes:

[0015] The positioning post is fixed to the fixing frame and is located on the central axis of the fixing shell;

[0016] The swing sleeve has a ball that is connected to the positioning post.

[0017] A sliding element, sealed and slidably connected to the side of the swing sleeve away from the positioning post;

[0018] The connecting column is fixed to the lower side of the fixed shell and ball-jointly connected to the sliding member;

[0019] A buffer element is provided inside the swing sleeve.

[0020] Furthermore, the swing sleeve is filled with a mixture of gas and hydraulic oil.

[0021] Furthermore, the buffer includes:

[0022] A sliding ring, which is sealed and slidably connected within the swing sleeve;

[0023] The connecting frames are symmetrically distributed and all fixed to the sliding ring. The upper connecting frame is fixed to one end of the sliding member located inside the swing sleeve.

[0024] A sealing disc is disposed on the sliding ring, and the sealing disc is provided with through holes evenly distributed in the circumferential direction;

[0025] The second springs are symmetrically distributed and fixed between the corresponding connecting frame and the sealing disc.

[0026] Furthermore, the diameter of the inner ring surface of the sliding ring gradually decreases from the middle to both sides, and the diameter of the middle part of the inner ring surface of the sliding ring is equal to the diameter of the sealing disc.

[0027] Furthermore, it also includes:

[0028] The third spring is fixed between the swing sleeve and the buffer shell.

[0029] Furthermore, the number of the third springs is at least two, and all the third springs are evenly distributed circumferentially.

[0030] The beneficial effects are as follows: This invention uses the fixed shell to swing within the buffer shell, thereby preventing the swing impact force on the fixed frame from acting simultaneously on the fixed shell and the battery body, reducing the direct impact force on the battery body and improving its safety. During the swinging process of the fixed shell and the battery body, the gas-liquid mixture in the swing sleeve slows down the offset speed of the sliding component and the buffer component relative to the swing sleeve, thereby indirectly buffering the impact force on the battery body. At the same time, the swing sleeve, sliding component, and buffer component alone can buffer the swing of the fixed shell and the battery body in any direction, without the need for too many buffer structures, thus improving the applicability of this lithium-ion battery. By observing the displacement deviation between the sealing disc and the sliding ring, the fixed shell and the battery body are further buffered in a targeted manner to accommodate different swing impact forces, allowing the battery body to adapt to different swing impact forces. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;

[0033] Figure 3 This is a three-dimensional structural diagram of the positioning post and the swing sleeve of the present invention;

[0034] Figure 4 This is a three-dimensional structural diagram of the buffer component of the present invention.

[0035] The component names and serial numbers in the figure are as follows: 1-fixed frame, 2-buffer housing, 201-first spring, 3-fixed housing, 4-battery body, 5-ball bearing, 6-positioning post, 7-swing sleeve, 8-sliding component, 9-connecting post, 10-connecting frame, 11-sliding ring, 12-sealing disc, 13-second spring, 14-third spring. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] A type of safe solid-state lithium-ion battery, such as Figures 1-3As shown, the device includes a fixed frame 1; a buffer shell 2, the lower side of which is an annular portion and slidably connected to the upper side of the fixed frame 1, the inner surface of which is a first annular curved surface; a fixed shell 3, disposed inside the buffer shell 2, the outer surface of which is a second annular curved surface, the first annular curved surface of the buffer shell 2 and the second annular curved surface of the fixed shell 3 being concentric spherical surfaces; a battery body 4, installed inside the fixed shell 3; a deceleration assembly, disposed between the fixed frame 1 and the fixed shell 3, used to reduce the swing speed of the fixed shell 3; and a first spring 201 fixed between the buffer shell 2 and the fixed frame 1, the first spring 201 used to support the weight of the buffer shell 2, the fixed shell 3 and the battery body 4, and to reduce the swaying speed of the fixed shell 3. The longitudinal vibration experienced by the battery body 4 is buffered. The inner surface of the buffer shell 2 is rotatably connected with evenly distributed balls 5. The evenly distributed balls 5 are all in contact with the outer surface of the fixed shell 3. The balls 5 reduce the friction between the fixed shell 3 and the buffer shell 2. The counterclockwise swing of the buffer shell 2 will not directly drive the fixed shell 3 to swing synchronously, thereby reducing the swing impact force experienced by the fixed shell 3 and the battery body 4 inside it. The diameter of the upper part of the inner surface of the buffer shell 2 is smaller than the maximum diameter of the outer surface of the fixed shell 3. When the fixed shell 3 swings relative to the buffer shell 2, the fixed shell 3 will not move out of the buffer shell 2, ensuring the stability of the battery body 4 when subjected to swing impact.

[0039] like Figures 1-4 As shown, the deceleration assembly includes: a positioning post 6, fixed to the middle of the lower side of the fixed frame 1 and located on the central axis of the fixed shell 3; a swing sleeve 7, ball-jointed with the positioning post 6, the lower side of the swing sleeve 7 being spherical and filled with a mixture of gas and hydraulic oil; a sliding member 8, sealed and slidably connected to the upper side of the swing sleeve 7. During the upward or downward movement of the sliding member 8 relative to the swing sleeve 7, taking the upward movement of the sliding member 8 relative to the swing sleeve 7 as an example, the volume occupied by the sliding member 8 in the swing sleeve 7 decreases as the sliding member 8 moves upward, thus reducing the air pressure in the swing sleeve 7 and adapting to the change in volume in the swing sleeve 7 when the sliding member 8 moves upward; a connecting post 9, fixed to the lower side of the fixed shell 3 and ball-jointed with the sliding member 8, the upper side of the sliding member 8 being spherical and the lower side being cylindrical; and a buffer member, disposed inside the swing sleeve 7.

[0040] like Figure 4 As shown, the buffer includes: a sliding ring 11, which is sealed and slidably connected to the swing sleeve 7; two connecting frames 10, which are symmetrically distributed vertically and fixed to the sliding ring 11, with the upper connecting frame 10 fixed to the lower end of the sliding member 8; a sealing disc 12, which is disposed on the inner ring surface of the sliding ring 11, and the sealing disc 12 is provided with circumferentially evenly distributed through holes, the diameter of the inner ring surface of the sliding ring 11 gradually decreases from the middle to both sides, and the diameter of the middle part of the inner ring surface of the sliding ring 11 is equal to the diameter of the sealing disc 12; and two second springs 13, which are symmetrically distributed vertically and fixed between the corresponding connecting frame 10 and the sealing disc 12.

[0041] After installation, existing lithium-ion batteries only have longitudinal and circumferential horizontal buffer structures for fixing them, but no swing buffer structure. When the vehicle is in motion, such as on uneven roads, the lithium-ion battery will be subjected to more swing impacts, especially lithium-ion batteries installed on ships, where the swing amplitude is more obvious. This makes it difficult for existing lithium-ion batteries to mitigate swing impacts, thus affecting the use of lithium-ion batteries.

[0042] This lithium-ion battery can be installed in vehicles, ships, and robotic arms that frequently swing to absorb vibrations during movement, such as on amusement park pendulum rides or crane booms. The operator first secures the battery body 4 to the fixed housing 3 using a fixed structure (an existing structure not shown in the diagram). After the lithium-ion battery is secured, the center of gravity of the lithium-ion battery and the fixed housing 3 is located below the horizontal plane of the maximum diameter of the buffer housing 2, thus maintaining the stability of the lithium-ion battery and the fixed housing 3. Figure 2 In the state shown, the first spring 201 is only used to support the weight of the buffer shell 2, the fixed shell 3 and the battery body 4, and to buffer the longitudinal vibration of the battery body 4. When the vehicle or ship swings, the vehicle or ship will cause the fixed frame 1 to swing. Taking the counterclockwise swing of the fixed frame 1 as an example, the fixed frame 1 drives the buffer shell 2 to swing counterclockwise. Since the ball 5 reduces the friction between the fixed shell 3 and the buffer shell 2, the counterclockwise swing of the buffer shell 2 will not directly drive the fixed shell 3 to swing synchronously, thereby reducing the swing impact force on the fixed shell 3 and the battery body 4 inside it. Since the diameter of the upper part of the inner surface of the buffer shell 2 is smaller than the maximum diameter of the outer surface of the fixed shell 3, the fixed shell 3 will not move out of the buffer shell 2 when it swings relative to the buffer shell 2, thus ensuring the stability of the battery body 4 when subjected to swing impact.

[0043] During the counterclockwise swing of the buffer shell 2 relative to the fixed shell 3, the distance between the positioning post 6 and the connecting post 9 increases, the sliding member 8 rotates relative to the connecting post 9, and the swing sleeve 7 swings counterclockwise around the upper end of the sliding member 8. The sliding member 8 moves upward relative to the swing sleeve 7. The sliding member 8 drives the sliding ring 11 and the lower connecting frame 10 to move upward through the upper connecting frame 10. The two connecting frames 10 drive the sealing plate 12 to move upward through the two second springs 13. The gas-liquid mixture above the sealing plate 12 enters the lower part of the sealing plate 12 through the through hole of the sealing plate 12 (the liquid level in the gas-liquid mixture in the swing sleeve 7 is always higher than the sealing plate 12). During the process of the gas-liquid mixture passing through the through hole of the sealing plate 12, the sealing plate 12 is impacted by the gas-liquid mixture, thereby slowing down the upward movement speed of the sealing plate 12 and reducing the upward movement speed of the sliding member 8 relative to the swing sleeve 7. This reduces the deflection speed of the fixed shell 3 and the battery body 4 relative to the buffer shell 2, thereby reducing the swing impact force on the fixed shell 3 and the battery body 4.

[0044] When the fixed shell 3 and battery body 4 are subjected to a swinging impact force, the second spring 13 keeps the outer ring surface of the sealing disc 12 sealed to the middle of the inner ring surface of the sliding ring 11. The gas-liquid mixture in the swing sleeve 7 only flows through the through hole of the sealing disc 12. When the swinging impact force on the fixed shell 3 and battery body 4 increases, the impact force of the gas-liquid mixture on the sealing disc 12 increases, and the sealing disc 12 moves downward relative to the sliding ring 11. The upper second spring 13 is stretched, and the lower second spring 13 is compressed. When the outer ring surface of the sealing disc 12 no longer contacts the middle of the inner ring surface of the sliding ring 11, an annular gap is formed between the outer ring surface of the sealing disc 12 and the lower side of the inner ring surface of the sliding ring 11. At this time, the upper part of the sealing disc 12... Some of the gas-liquid mixture will flow downward through the annular gap between the sealing disc 12 and the sliding ring 11, thereby avoiding the inability to alleviate the increased impact force on the fixed shell 3 and the battery body 4 through the through hole of the sealing disc 12 alone (when the flow area of ​​the gas-liquid mixture is constant, if the relative displacement of the sliding member 8 and the swing sleeve 7 increases, the constant flow area will reduce the relative displacement speed of the sliding member 8 and the swing sleeve 7, thereby indirectly reducing the buffering capacity of the fixed shell 3 and the battery body 4 against the swing impact). As the impact force increases, the downward offset distance of the sealing disc 12 relative to the sliding ring 11 increases, and the flow area of ​​the annular gap between the sealing disc 12 and the sliding ring 11 increases, thereby improving the buffering effect on the fixed shell 3 and the battery body 4.

[0045] When the oscillation of the buffer shell 2 disappears, the fixed shell 3 and the battery body 4 automatically straighten under their own weight. The sliding member 8, through its components, drives the sliding ring 11 and the sealing disc 12 to move downwards. The gas-liquid mixture located below the sealing disc 12 in the swing sleeve 7 enters the upper part of the sealing disc 12 through the through hole of the sealing disc 12. When the fixed shell 3 and the battery body 4 are subjected to longitudinal impact, the fixed shell 3 and the battery body 4 drive the buffer shell 2 to move upwards through the ball bearing 5. The fixed shell 3 drives the sliding member 8 and the buffer member to move upwards through the connecting column 9, thereby buffering the longitudinal vibration of the battery body 4. At the same time, the upward movement of the buffer shell 2 stretches the first spring 201, and the first spring 201 decelerates. The slow upward movement of the casing 2 indirectly buffers the longitudinal vibration of the battery body 4. During the upward or downward movement of the sliding member 8 relative to the swing sleeve 7, taking the upward movement of the sliding member 8 relative to the swing sleeve 7 as an example, as the sliding member 8 moves upward, the volume occupied by the sliding member 8 in the swing sleeve 7 becomes smaller, so the gas pressure in the swing sleeve 7 will decrease. The gas pressure in the swing sleeve 7 decreases to adapt to the change in the volume of the swing sleeve 7 when the sliding member 8 moves upward. Therefore, by setting the buffer material in the swing sleeve 7 to a gas-liquid mixture, the fixed casing 3 and the battery body 4 are better buffered. (If there is no gas in the swing sleeve 7, the sliding member 8 cannot move upward or downward relative to the swing sleeve 7.)

[0046] By swinging the fixed shell 3 within the buffer shell 2, the swinging impact force on the fixed frame 1 is prevented from acting simultaneously on the fixed shell 3 and the battery body 4, reducing the direct impact force on the battery body 4 and improving its safety. During the swinging process of the fixed shell 3 and the battery body 4, the gas-liquid mixture in the swing sleeve 7 slows down the offset speed of the sliding member 8 and the buffer member relative to the swing sleeve 7, thereby indirectly buffering the impact force on the battery body 4. At the same time, the swing sleeve 7, the sliding member 8, and the buffer member are sufficient to buffer the swinging of the fixed shell 3 and the battery body 4 in any direction, without the need for excessive buffering structures, thus improving the applicability of this lithium-ion battery. By observing the displacement deviation between the sealing disc 12 and the sliding ring 11, targeted buffering is applied to the fixed shell 3 and the battery body 4 for different impact forces, allowing the battery body 4 to adapt to different swinging impact forces.

[0047] Example 2

[0048] Based on Example 1, a safe solid-state lithium-ion battery, such as Figure 2 and Figure 3As shown, it also includes: a third spring 14, which is fixed between the swing sleeve 7 and the buffer shell 2. There are at least two third springs 14. All the third springs 14 are evenly distributed in the circumference. In this article, two circumferentially distributed third springs 14 are used as an example for description. The even distribution ensures that the swing sleeve 7 is subjected to uniform force, which makes it easy for the swing sleeve 7 to quickly return to the vertical state after being subjected to impact force.

[0049] When the swing sleeve 7 swings relative to the positioning post 6, the two third springs 14 slow down the swing speed of the swing sleeve 7. The main function of the two third springs 14 is to reset the swing sleeve 7 after the swing disappears, so as to ensure that the swing sleeve 7 remains in a vertical state.

[0050] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A safety solid-state lithium-ion battery, characterized by, The utility model relates to a battery fixing device, including: Fixed frame (1); Buffer shell (2) slidingly connected to the upper side of the fixed frame (1), the inner surface of which is a first annular curved surface; Fixed shell (3) arranged in the buffer shell (2), the outer surface of which is a second annular curved surface, and the first annular curved surface of the buffer shell (2) and the second annular curved surface of the fixed shell (3) are concentric spherical surfaces; Battery body (4) mounted in the fixed shell (3); A deceleration assembly is arranged between the fixed frame (1) and the fixed shell (3) to slow down the swing speed of the fixed shell (3); The deceleration assembly includes a positioning column (6) fixed to the fixed frame (1) and located on the central axis of the fixed shell (3); Swing sleeve (7) is ball-jointed to the positioning column (6); A sliding member (8) is sealingly and slidingly connected to one side of the swing sleeve (7) away from the positioning column (6); A connecting column (9) is fixed to the lower side of the fixed shell (3) and is ball-jointed to the sliding member (8); A buffer member is arranged in the swing sleeve (7); The swing sleeve (7) is filled with a mixture of gas and hydraulic oil; The buffer member includes: A sliding ring (11) is sealingly and slidingly connected in the swing sleeve (7); Symmetrically distributed connecting frames (10) are fixed to the sliding ring (11), and the upper connecting frame (10) is fixed to one end of the sliding member (8) located in the swing sleeve (7); A sealing disc (12) is arranged in the sliding ring (11), and the sealing disc (12) is provided with through holes uniformly distributed in the circumference; Second springs (13) are symmetrically distributed and fixed between the corresponding connecting frames (10) and the sealing disc (12).

2. The safe solid-state lithium-ion battery according to claim 1, wherein A first spring (201) is fixed between the buffer shell (2) and the fixed frame (1).

3. The safe solid-state lithium-ion battery according to claim 2, wherein Uniformly distributed rolling balls (5) are rotatably connected to the inner surface of the buffer shell (2), and the uniformly distributed rolling balls (5) are in contact with the outer surface of the fixed shell (3).

4. The safe solid-state lithium-ion battery according to claim 3, wherein The diameter of the upper side of the inner surface of the buffer shell (2) is smaller than the maximum diameter of the outer surface of the fixed shell (3).

5. The safe solid-state lithium-ion battery according to claim 4, wherein The diameter of the inner surface of the sliding ring (11) gradually decreases from the middle to both sides, and the diameter of the middle part of the inner surface of the sliding ring (11) is equal to the diameter of the sealing disc (12).

6. The safe solid-state lithium-ion battery according to claim 5, wherein It also includes: A third spring (14) is fixed between the swing sleeve (7) and the buffer shell (2).

7. The safe solid-state lithium-ion battery according to claim 6, wherein The number of third springs (14) is at least two, and all the third springs (14) are uniformly distributed in the circumference.

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