Safety protection device

Abstract

The invention discloses a safety protection device, and relates to the technical field of battery cell safety performance testing, and the safety protection device comprises a cylinder body which is externally fixedly provided with a first rotating shaft; a locking part is arranged outside the cylinder body, and the locking part can be switched between a locking state and an unlocking state; the cover body is used for covering an opening in the upper end of the barrel body, and the cover body is connected to the first rotating shaft and can rotate around the first rotating shaft; the barrier layer is arranged between the barrel body and the cover body, and a ventilation structure is arranged on the barrier layer; one end of the barrier layer is rotationally connected to the first rotating shaft; the other end of the barrier layer is matched with the locking part; when the locking part is in a locking state, the barrier layer is fixed on the barrel body; and when the locking part is in an unlocking state, the barrier layer can rotate around the first rotating shaft. The safety protection device provided by the embodiment of the invention not only can block the battery cell, but also has a pressure relief function.

Description

Technical Field

[0001] This manual relates to the field of battery cell safety performance testing technology, and in particular to a safety protection device. Background Technology

[0002] For existing lithium-ion battery cells after safety performance testing (typically heavy object impact testing), the conventional method is to directly eliminate safety hazards by prolonged immersion in salt water. However, research-related experiments require the collection of performance parameters of the cells after testing, such as voltage, internal resistance, and weight. Immersion in salt water would damage the sample's original state. To meet the requirements for long-term preservation in large batches, the current methods mainly include the following two:

[0003] ① Use a common covered fireproof container (such as...) Figure 1 As shown), the advantage is that it is convenient and time-saving to operate, but the disadvantage is that there is a small probability that the battery cell will explode (e.g.). Figure 2 As shown, this indicates that the battery cell may still explode approximately 15 minutes after being impacted by a heavy object. The exploding battery cell could then burst through the container lid and fly out, posing an extremely high risk of injury (e.g., ...). Figure 3 and Figure 4 (As shown).

[0004] ② Using standard explosion-proof cabinets has the advantage of having built-in explosion vents, but the disadvantages are that they are heavy, bulky, costly, require frequent opening and closing, and are inconvenient to move. Summary of the Invention

[0005] In view of the shortcomings of the prior art, one purpose of this specification is to provide a safety protection device with a very simple structure that can not only block the battery cell, but also has a pressure relief function.

[0006] To achieve the above objectives, this specification provides a safety protection device, comprising:

[0007] The cylinder has a first rotating shaft fixedly mounted on its exterior; a locking part is provided on the exterior of the cylinder, which can switch between a locked state and an unlocked state.

[0008] A cover body, the cover body being used to cover the upper opening of the cylinder body, the cover body being connected to the first rotating shaft and being able to rotate around the first rotating shaft;

[0009] A barrier layer is disposed between the cylinder and the cover, and the barrier layer is provided with a breathable structure; one end of the barrier layer is rotatably connected to the first rotating shaft; the other end of the barrier layer cooperates with the locking part; when the locking part is in the locked state, the barrier layer is fixed to the cylinder; when the locking part is in the unlocked state, the barrier layer can rotate around the first rotating shaft.

[0010] In a preferred embodiment, the cover is configured to be opened individually or simultaneously with the barrier layer when it is opened.

[0011] In a preferred embodiment, at least one of the cylinder, cover, and barrier layer is made of a material selected from metal or flame-retardant material. The metal can be iron, aluminum alloy, stainless steel, etc., preferably stainless steel. The flame-retardant material can be flame-retardant fiberglass board, flame-retardant plastic, etc., and the flame-retardant plastic can be selected from, for example, flame-retardant acrylonitrile-butadiene-styrene copolymer (ABS), bakelite (phenolic plastic), etc.

[0012] In a preferred embodiment, at least a portion of the area of ​​the barrier layer contains a breathable structure. That is, the barrier layer may contain a breathable structure in one part and an impermeable metal layer in another part; or the entire barrier layer may contain a breathable structure.

[0013] In a preferred embodiment, the breathable structure is a mesh structure. The mesh structure is preferably a cross-shaped mesh structure; the mesh size is smaller than a first predetermined value; and the distance between the barrier layer and the inner wall of the cylinder is smaller than a second predetermined value.

[0014] In a preferred embodiment, the first predetermined value and / or the second predetermined value is 18 mm.

[0015] In a preferred embodiment, an operating part is fixedly connected to the other end of the blocking layer, and the blocking layer cooperates with the locking part through the operating part.

[0016] In a preferred embodiment, a second rotating shaft is fixedly provided on the outside of the cylinder; the bottom end of the locking part is rotatably connected to the second rotating shaft, the top of the locking part is provided with an inclined surface, and a slot is provided below the inclined surface; when the blocking layer falls due to gravity, the operating part contacts the inclined surface, thereby pushing the locking part to rotate around the second rotating shaft to switch from the locked state to the unlocked state, the operating part moves downward along the inclined surface until the operating part and the inclined surface separate, the operating part enters the slot, and at the same time the locking part rotates back to the locked state around the second rotating shaft.

[0017] In a preferred embodiment, an elastic element is provided between the locking part and the outer wall surface of the cylinder; in the absence of external force, the elastic element keeps the locking part in a locked state; when pressure is applied to the locking part or the elastic element to compress the elastic element, the locking part switches from the locked state to the unlocked state.

[0018] In a preferred embodiment, a first bracket is fixedly mounted on the outside of the cylinder, and the second rotating shaft is fixedly mounted on the first bracket; the first bracket has a blocking mechanism on the side of the second rotating shaft opposite to the cylinder, which is used to limit the locking part and keep the locking part in the locked state. The blocking mechanism is preferably a baffle.

[0019] In a preferred embodiment, a second bracket is fixedly provided on the outer side of the cylinder opposite to the first bracket, and the first rotating shaft is fixedly installed on the second bracket; the cover is fixedly provided with a first connecting frame rotatably connected to the first rotating shaft; the barrier layer is fixedly provided with a second connecting frame rotatably connected to the first rotating shaft; the positions of the second bracket, the first connecting frame and the second connecting frame are corresponding.

[0020] In a preferred embodiment, the size of the barrier layer is smaller than the size of the inner wall of the cylinder; the cover has a first groove near the first connecting frame, and the top of the cylinder has a second groove; the first groove, the second groove, and the second connecting frame are aligned; the first groove and the second groove are used to accommodate part of the second connecting frame; the second connecting frame is bent.

[0021] In a preferred embodiment, the cover has a third groove on the side opposite to the first groove, and the top of the cylinder has a fourth groove. The third groove, the fourth groove and the operating part are aligned and arranged, and the third groove and the fourth groove are used to accommodate part of the operating part.

[0022] Beneficial effects:

[0023] The safety protection device provided in this embodiment includes a cylinder, a cover, and a blocking layer. One end of the cover is rotatably connected to a first rotating shaft, maintaining the function of opening the cover for pressure relief. One end of the blocking layer is rotatably connected to the first rotating shaft, while the other end engages with a locking mechanism, ensuring that the blocking layer can be opened to place the battery cell inside the cylinder. When the blocking layer is fixed to the cylinder, it cuts off the battery cell's escape path. Simultaneously, the ventilated structure on the blocking layer ensures the longitudinal pressure relief performance of the cylinder. The blocking layer and the cover are coaxial (both are on the first rotating shaft). When the blocking layer is lifted, the cover is also lifted simultaneously, eliminating the need for two separate actions. After the blocking layer is released, the blocking layer and the cover fall due to their own weight, and the blocking layer automatically engages with the locking mechanism to secure itself. If the battery cell inside the cylinder subsequently explodes, the cover can be forced open to relieve pressure, but the blocking layer, due to its ventilated structure and the restriction of the locking mechanism, will not open, thus providing a safety protection function. The safety protection device has a very simple structure. It cleverly uses a barrier layer to block the battery cell while also relieving pressure, which can ensure the identification and control of safety risks during the battery cell sample retention process after testing.

[0024] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope as a result.

[0025] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0026] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 Photograph of a covered fireproof barrel in the prior art;

[0029] Figure 2 This is a graph showing the relationship between the failure rate and failure time of battery cells after a heavy impact test.

[0030] Figure 3 This is a screenshot from a surveillance camera showing the lid of a covered fireproof container being blown open when the battery cell explodes.

[0031] Figure 4 for Figure 3 A screenshot from a monitoring system showing the cell flying out of the battery.

[0032] Figure 5 This is a schematic diagram of the structure of a safety protection device provided in this embodiment;

[0033] Figure 6 for Figure 5 Another structural diagram from a different perspective;

[0034] Figure 7 for Figure 5 The front view;

[0035] Figure 8 for Figure 5 A schematic diagram of the exploded structure;

[0036] Figure 9 This is a schematic diagram of the structure of a locking part provided in this embodiment;

[0037] Figure 10 This is a top view of a barrier layer provided in this embodiment;

[0038] Figure 11 for Figure 5 A schematic diagram of the structure of the safety protection device when both the barrier layer and the cover are open;

[0039] Figure 12 for Figure 5 A schematic diagram of the structure of the safety protection device cover when it is opened;

[0040] Figure 13 This is a photograph of the safety protection device in another embodiment when both the barrier layer and the cover are open;

[0041] Figure 14 This is a photograph of the safety protection device with the barrier layer closed and the cover open in another embodiment;

[0042] Figure 15 This is a photograph of the safety protection device with both the barrier layer and the cover closed, according to another embodiment.

[0043] Figure 16 for Figure 15 Enlarged structural diagram at point A;

[0044] Figure 17 For pressing Figure 16 The image shows the locking part in the unlocked state.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Cylinder body; 11. First rotating shaft; 12. Second rotating shaft; 13. First bracket; 14. Blocking mechanism; 141. Mounting shaft; 142. Blocking component; 15. Second bracket; 16. Second groove; 17. Fourth groove; 2. Locking part; 21. Locking plate; 211. Inclined surface; 212. Slot; 213. Through hole; 22. Connecting plate; 3. Cover body; 31. First connecting frame; 32. First groove; 33. Third groove; 4. Blocking layer; 41. Ventilation structure; 5. Operating part; 6. Second connecting frame; 61. First connecting section; 62. Second connecting section; 63. Third connecting section; 7. Elastic component. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0048] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] Please see Figures 5 to 17 This application provides a safety protection device, including: a cylinder 1, a cover 3, and a barrier layer 4.

[0051] The cylinder 1 has a first rotating shaft 11 fixedly mounted on its exterior. A locking part 2 is also provided on the exterior of the cylinder 1, and the locking part 2 can switch between a locked state and an unlocked state. A cover 3 covers the upper opening of the cylinder 1. The cover 3 is connected to the first rotating shaft 11 and can rotate around the first rotating shaft 11. A blocking layer 4 is disposed between the cylinder 1 and the cover 3. A ventilated structure 41 is provided on the blocking layer 4. One end of the blocking layer 4 is rotatably connected to the first rotating shaft 11. The other end of the blocking layer 4 engages with the locking part 2. When the locking part 2 is in the locked state, the blocking layer 4 is fixed to the cylinder 1. When the locking part 2 is in the unlocked state, the blocking layer 4 can rotate around the first rotating shaft 11.

[0052] The safety protection device provided in this embodiment includes a cylinder 1, a cover 3, and a blocking layer 4. One end of the cover 3 is rotatably connected to a first rotating shaft 11, maintaining the function of opening the cover 3 for pressure relief. One end of the blocking layer 4 is rotatably connected to the first rotating shaft 11, and the other end engages with a locking part 2, ensuring that the blocking layer 4 can be opened to place the battery cell inside the cylinder 1. When the blocking layer 4 is fixed to the cylinder 1, it cuts off the battery cell's escape path. Simultaneously, the venting structure 41 on the blocking layer 4 ensures the longitudinal pressure relief performance of the cylinder 1. The blocking layer 4 and the cover 3 are coaxial (both are on the first rotating shaft 11). When the blocking layer 4 is lifted, the cover 3 is also lifted simultaneously, eliminating the need for two separate actions. After the blocking layer 4 is released, the blocking layer 4 and the cover 3 fall due to their own weight, and the blocking layer 4 automatically engages with the locking part 2 to secure itself. If the battery cell inside cylinder 1 subsequently explodes, the cover 3 can be forced open to release pressure, but the barrier layer 4, due to its built-in ventilated structure 41 and locking part 2, will not open, thus providing a safety protection function. This safety protection device has a very simple structure, cleverly utilizing the barrier layer 4 to block the battery cell while also providing pressure relief, ensuring the identification and control of safety risks during the post-testing battery cell sample retention process.

[0053] In this embodiment, the cover 3 is configured to be opened individually or simultaneously with the barrier layer 4. When the barrier layer 4 engages with the locking part 2, the locking part 2 is in a locked state, and the barrier layer 4 is fixed to the cylinder 1 and cannot be opened. When the battery cell inside the cylinder 1 explodes, the explosive gas passes through the venting structure 41 and forces the cover 3 open to release pressure. The battery cell is blocked inside the cylinder 1 by the barrier layer 4 and will not fly out. At this time, the cover 3 is opened individually. When the locking part 2 is in an unlocked state, the barrier layer 4 can be opened. Since the cover 3 is located above the barrier layer 4, and the rotation axes of both the barrier layer 4 and the cover 3 are the first rotating shaft 11, the cover can be opened simultaneously with the barrier layer 4, allowing the tested battery cell to be placed into the cylinder 1.

[0054] In this embodiment, at least one of the cylinder 1, the cover 3, and the barrier layer 4 is made of materials selected from metals, flame-retardant materials, etc. The metal can be iron, aluminum alloy, stainless steel, etc., preferably stainless steel. The flame-retardant material can be flame-retardant fiberglass board, flame-retardant plastic, etc., and the flame-retardant plastic can be selected from, for example, flame-retardant acrylonitrile-butadiene-styrene copolymer (ABS), bakelite (phenolic plastic), etc. Preferably, the cylinder 1, the cover 3, and the barrier layer 4 are all made of metal.

[0055] Specifically, at least a portion of the area of ​​the barrier layer 4 contains a breathable structure 41. That is, the barrier layer 4 may contain a breathable structure 41 in one part and an impermeable metal layer in another part; or the entire barrier layer 4 may contain a breathable structure 41. The size of the breathable structure 41 should be smaller than the minimum size of the battery cell. In a specific embodiment, when the battery cell used for testing is a cylindrical battery cell, the size of the breathable structure 41 should be smaller than the diameter of the cylindrical battery cell, so as to prevent the cylindrical battery cell from flying out of the cylinder 1 in whole or in part.

[0056] Preferably, the breathable structure 41 in this invention is a mesh structure, which improves breathability and facilitates the release of explosive gases. The mesh structure is preferably a cross-shaped intersecting mesh structure. The barrier layer 4 in this invention is preferably a metal mesh, thus possessing sufficient strength to withstand combustion and explosion. In one embodiment, the barrier layer 4 can be made of stainless steel wire.

[0057] In this embodiment, the size of the barrier layer 4 is smaller than the size of the inner wall of the cylinder 1, so that the barrier layer 4 can be placed inside the top of the cylinder 1 to block the exploding battery cell. The mesh size of the ventilated structure 41 is smaller than a first predetermined value, and the distance between the barrier layer 4 and the inner wall of the cylinder 1 is smaller than a second predetermined value to prevent fragments generated by the explosion from flying out. The first and second predetermined values ​​can both be 8mm, 7mm, or 6mm, etc., designed according to the specific application scenario.

[0058] In this invention, the first predetermined value is limited to a diameter smaller than that of a cylindrical battery. For conventional 18650 and 21700 batteries, the diameters are 18 mm and 21 mm, respectively. Therefore, using 18 mm as the first predetermined value is appropriate.

[0059] As for the second predetermined value, it is actually necessary that the inner diameter of the barrier layer 4 and the inner diameter of the cylinder 1 are roughly the same. It can be considered that the barrier layer 4 also needs to completely cover the inner cylinder of the entire cylinder 1, so that the gap between the two should also be smaller than the second predetermined value. Similarly, for conventional 18650 batteries and 21700 batteries, the second predetermined value is 18mm, that is, the maximum gap between the two should be less than 18mm, which is appropriate. Conventional values ​​such as 8mm, 6mm, and 4mm are preferred.

[0060] In one specific embodiment, the outer ring of the barrier layer 4 is made of stainless steel wire with a diameter of 5mm, and the mesh inside the barrier layer 4 is made of stainless steel wire with a diameter of 1mm to 2mm, with a mesh size of 6mm to 7mm. The distance between the outer ring of the barrier layer 4 and the inner wall of the cylinder 1 is 3mm to 7mm. If it is too small, the barrier layer 4 will not be properly embedded; if it is too large, explosive fragments will be ejected. This application does not impose a unique limitation on the shape of the mesh of the barrier layer 4. Preferably, for ease of manufacturing, such as... Figure 10As shown, the mesh is square.

[0061] The shape and material of the cylinder 1 are not limited in this embodiment; it can be cylindrical or cuboid, and is preferably made of metal, such as iron or stainless steel. The shapes of the barrier layer 4 and the cover 3 can be consistent with the shape of the cylinder 1. Preferably, the cylinder 1 is cylindrical and made of iron, and both the barrier layer 4 and the cover 3 are circular.

[0062] like Figure 8 As shown, an operating part 5 is fixedly connected to the other end of the blocking layer 4, and the blocking layer 4 cooperates with the locking part 2 through the operating part 5. When the locking part 2 is in the locked state, the operating part 5 can be locked by the locking part 2, so that the blocking layer 4 is fixed to the cylinder 1. When the locking part 2 is in the unlocked state, the operating part 5 can move relative to the locking part 2, so that the blocking layer 4 can rotate around the first rotating shaft 11.

[0063] Specifically, when the locking part 2 is in the locked state, the operating part 5 is engaged with the locking part 2, thereby fixing the entire blocking layer 4 to the upper end of the entire cylinder 1. This ensures that the exposed gaps at the upper end of the entire cylinder 1 are no larger than the venting structure 41. Since the diameter of the cylindrical battery cell is larger than the venting structure 41, even if the cylindrical battery cell undergoes a violent combustion explosion, it cannot fly out of the entire cylinder 1. Furthermore, the large amount of explosive gas generated during the combustion explosion can be smoothly discharged through the venting structure 41. This smooth discharge of explosive gas also requires the cooperation of the movable, rotatably connected cover 3. The movable cover 3 is smoothly flipped over by the explosive gas, allowing the explosive gas to be discharged smoothly without obstruction, while the burning cylindrical battery cell is blocked by the blocking layer 4 and cannot fly out of the cylinder 1.

[0064] Specifically, a second rotating shaft 12 is fixedly provided on the outside of the cylinder 1. The bottom end of the locking part 2 is rotatably connected to the second rotating shaft 12, so that the locking part 2 can rotate around the second rotating shaft 12 to switch between the locked state and the unlocked state. The top of the locking part 2 is provided with an inclined surface 211 for contacting the operating part 5, and the bottom of the inclined surface 211 is provided with a slot 212 for locking the operating part 5.

[0065] like Figure 11 and Figure 13As shown, when a battery cell needs to be inserted into the cylinder 1, lifting the operating part 5 keeps both the blocking layer 4 and the cover 3 open. After the battery cell is placed, the blocking layer 4 and the cover 3 need to be closed. Simply release the operating part 5, and the cover 3 and the blocking layer 4 will fall due to gravity, rotating simultaneously around the first rotating shaft 11. As the blocking layer 4 and the cover 3 fall due to gravity, the operating part 5 first contacts the inclined surface 211, thereby pushing the locking part 2 to rotate around the second rotating shaft 12 to switch from the locked state to the unlocked state. The operating part 5 moves downward along the inclined surface 211 until the operating part 5 separates from the inclined surface 211, and the operating part 5 enters the slot 212. At the same time, the locking part 2 rotates around the second rotating shaft 12 back to the locked state. At this point, both the blocking layer 4 and the cover 3 have completed the closing action. Figure 5 and Figure 15 As shown.

[0066] Specifically, an elastic element 7 is provided between the locking part 2 and the outer wall surface of the cylinder 1. The elastic element 7 is preferably a spring or other elastic part. In the absence of external force, the elastic element 7 keeps the locking part 2 in the locked state. When pressure is applied to the locking part 2 or the elastic element 7 to compress the elastic element 7, the locking part 2 switches from the locked state to the unlocked state; and when the applied pressure is removed, the elastic element 7 needs to return to its original shape, thereby switching the locking part 2 from the unlocked state to the locked state. Here, "applied pressure" includes the pressure applied when the blocking layer 4 and the cover 3 fall due to gravity, when the operating part 5 and the inclined surface 211 come into contact, and the pressure applied by the operator when pressing the locking part 2 to open the blocking layer 4 and the cover 3.

[0067] In this embodiment, such as Figure 9 As shown, the locking part 2 includes at least two opposing locking plates 21 and a connecting plate 22 connecting the two locking plates 21. The locking plates 21 are located on the side of the connecting plate 22 away from the cylinder 1. An elastic member 7 is disposed between the connecting plate 22 and the outer wall surface of the cylinder 1. The top of the locking plate 21 is provided with an inclined surface 211, which slopes downward from top to bottom toward the side away from the cylinder 1. The bottom end of the locking plate 21 is provided with a through hole 213, and the second rotating shaft 12 passes through multiple through holes 213, so that the locking plate 21 can rotate around the second rotating shaft 12. Figure 9 The structure shown is the three locking plates 21.

[0068] Specifically, the width of the locking part 2 is preferably greater than or equal to 70mm to ensure that the operating part 5 can be locked. The locking plate 21 and the connecting plate 22 are preferably made of stainless steel with a thickness of at least 2mm, because they are stress-bearing parts and are prone to deformation if they are too thin.

[0069] Accordingly, the shape of the operating part 5 is preferably " The operating part 5 can be formed by bending a 5mm diameter stainless steel bar and then welding it to one end of the blocking layer 4. The operating part 5 can serve as a handle for opening the blocking layer 4 and the cover 3. Of course, the shape of the operating part 5 can also be designed into other shapes as needed, as long as it can cooperate with the locking part 2.

[0070] like Figure 5 and Figure 7 As shown, a first bracket 13 is fixedly mounted on the outside of the cylinder 1, and a second rotating shaft 12 is fixedly mounted on the first bracket 13. A blocking mechanism 14 is provided on the side of the second rotating shaft 12 away from the cylinder 1, used to limit the locking part 2, keeping it in a locked state. The connecting plate 22 of the locking part 2 remains vertical under the action of the elastic member 7 and the blocking mechanism 14. The blocking mechanism 14 can rotate to a suitable structure as needed, such as a stop block or a baffle, etc. Figure 5 As shown, the blocking mechanism 14 is preferably a baffle, which can simplify the structure and realize the function of limiting the locking part 2.

[0071] In one embodiment, such as Figure 16 As shown, the blocking mechanism 14 includes a mounting shaft 141 and a blocking member 142. One end of the mounting shaft 141 is mounted to the outer wall surface of the cylinder 1, and the other end passes through the connecting plate 22 of the locking part 2. The elastic member 7 is sleeved on the mounting shaft 141 located between the outer wall surface of the cylinder 1 and the locking part 2. The blocking member 142 is fixedly mounted on the mounting shaft 141 on the side of the locking part 2 opposite to the elastic member 7, thereby limiting the locking part 2 on that side. The connecting plate 22 of the locking part 2 has a through hole at a corresponding position on the mounting shaft 141 for it to pass through.

[0072] Specifically, the mounting shaft 141 and the blocking member 142 can be connected by threads. That is, the mounting shaft 141 can have threads on its exterior, and correspondingly, the blocking member 142 has internal threads that mate with the external threads of the mounting shaft 141. This allows for quick fixation of the blocking member 142 to the mounting shaft 141, and also enables rapid adjustment of the blocking member 142's position on the mounting shaft 141 as needed. For example, the mounting shaft 141 can be a screw, and the blocking member 142 can be a matching nut. Of course, other mating structures can be used for the mounting shaft 141 and the blocking member 142, such as welding or riveting; this application does not impose a single limitation on this.

[0073] like Figure 17 As shown, when the locking part 2 is pressed and placed in the unlocked state, the elastic member 7 is compressed, and the connecting plate 22 of the locking part 2 moves away from the blocking member 142; Figure 16As shown, when no external force is applied to the locking part 2, the elastic member 7 applies a pushing force to one side of the connecting plate 22 of the locking part 2, and the other side of the connecting plate 22 is limited by the blocking member 142. Under the action of the elastic member 7 and the blocking mechanism 14, the connecting plate 22 of the locking part 2 always remains in a vertical state.

[0074] like Figure 6 and Figure 7 As shown, a second bracket 15 is fixedly mounted on the outer side of the cylinder 1 opposite to the first bracket 13, and a first rotating shaft 11 is fixedly mounted on the second bracket 15. A first connecting frame 31, rotatably connected to the first rotating shaft 11, is fixedly mounted on the cover 3. The bottom end of the first connecting frame 31 may have a circular iron ring for fitting onto the first rotating shaft 11, thus achieving a rotatable connection between the cover 3 and the cylinder 1. A second connecting frame 6, rotatably connected to the first rotating shaft 11, is fixedly mounted on the barrier layer 4. The bottom end of the second connecting frame 6 may have a circular iron ring for fitting onto the first rotating shaft 11, thus achieving a rotatable connection between the barrier layer 4 and the cylinder 1. The positions of the second bracket 15, the first connecting frame 31, and the second connecting frame 6 correspond to each other.

[0075] like Figure 6 and Figure 8 As shown, the cover 3 has a first groove 32 near the first connecting frame 31, and the top of the cylinder 1 has a second groove 16. The first groove 32, the second groove 16 and the second connecting frame 6 are aligned. The first groove 32 and the second groove 16 are used to accommodate part of the second connecting frame 6 to avoid interference between the cover 3, the barrier layer 4 and the cylinder 1.

[0076] Specifically, to ensure that the operating trajectory of the cover 3 is not interfered with, the second connecting frame 6 is bent, thus the second connecting frame 6 includes a first connecting segment 61, a second connecting segment 62, and a third connecting segment 63 connected in sequence. The first connecting segment 61 is connected to the barrier layer 4 and is parallel to the plane of the barrier layer 4, and part of the first connecting segment 61 is accommodated in the second groove 16. The second connecting segment 62 is perpendicular to the plane of the barrier layer 4, and the third connecting segment 63 is connected to the first rotating shaft 11. The second connecting segment 62 and the third connecting segment 63 are used to make way when the cover 3 rotates.

[0077] like Figure 8 As shown, the cover 3 has a third groove 33 on the side opposite to the first groove 32, and the top of the cylinder 1 has a fourth groove 17. The third groove 33, the fourth groove 17 and the operating part 5 are aligned. The third groove 33 and the fourth groove 17 are used to accommodate part of the operating part 5 to avoid interference between the cover 3, the barrier layer 4 and the cylinder 1.

[0078] It is important to note that the width (i.e., circumferential length) of the second groove 16 and the fourth groove 17 must be greater than the diameter of the second connecting frame 6 and the diameter of the operating part 5, respectively. This is to prevent slight deviations in the left and right positions of the blocking layer 4 during its descent, which could prevent the operating part 5 from automatically engaging with the locking part 2. The depth (i.e., axial length) of the second groove 16 and the fourth groove 17 should not be too large (e.g., not exceeding 6mm). Otherwise, the blocking layer 4 will be positioned too downwards. When the battery explodes, the impact on the edge will cause the blocking layer to deflect at a certain angle in the horizontal position, thereby increasing the gap between the blocking layer and the cylinder wall, and potentially allowing the battery to escape from the cylinder. In one embodiment, the width of the second groove 16 and the fourth groove 17 can be 8mm, and the depth of the second groove 16 and the fourth groove 17 can be 5mm. There are no special requirements for the dimensions of the first groove 32 and the third groove 33, as long as they do not interfere with the opening and closing of the blocking layer 4.

[0079] In a specific application scenario, the initial state of the safety protection device is as follows: Figure 5 and Figure 15 As shown, the operating part 5 is engaged in the slot 212 of the locking part 2, and the elastic element 7 always maintains a pushing force. When the battery cell inside the cylinder 1 explodes, the venting gas bursts open the cover 3 (e.g., Figure 12 and Figure 14 As shown), the barrier layer 4 remains in place due to the presence of the operating part 5. The battery cell flies up, hits the barrier layer 4, and bounces back into the cylinder 1. After the gas is released, the cover 3 falls freely back to the closed state. When personnel place the tested battery cell, they need to open the barrier layer 4 and the cover 3. This is done by lightly pressing the connecting plate 22 of the locking part 2 with one hand. The elastic element 7 retracts, the slot 212 disengages from the operating part 5, and the operator manually lifts the operating part 5. At this time, the operating part 5 will also lift the cover 3 (as shown). Figure 11 and Figure 13 (As shown), use the other hand to clamp the battery cell into the cylinder 1; after releasing the hand that lifted the operating part 5, the cover 3 and the blocking layer 4 fall freely together, and the operating part 5 falls to the inclined surface 211 at the top of the locking part 2. The elastic member 7 retracts due to the oblique component force of the operating part 5 until the operating part 5 descends to the slot 212. The slot 212 completes the rebound and locks the operating part 5 (as shown). Figure 5 and Figure 15 (As shown).

[0080] This invention modifies a commonly available fireproof iron canister, primarily addressing the following three technical issues: ① The explosion-proof function of the canister must not be compromised; if the lid is locked, the canister could deform and disintegrate upon battery combustion. ② The operation must not be overly cumbersome; the transfer of battery cells after testing also carries a risk of combustion and explosion, and the entire operation should typically be completed within 10 seconds—the simpler the operation, the better. ③ The newly added mechanism must completely avoid manual locking to prevent personnel from forgetting and causing the safety protection function to fail. In short, the safety protection device provided by this invention is effective, lightweight, and achieves a safe effect without increasing workload.

[0081] It should be noted that in the description of this specification, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this specification, unless otherwise stated, "a plurality of" means two or more.

[0082] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0083] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0084] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0085] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0086] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A safety protection device, characterized in that, include: The cylinder has a first rotating shaft fixedly mounted on its exterior; a locking part is provided on the exterior of the cylinder, which can switch between a locked state and an unlocked state. A cover body, the cover body being used to cover the upper opening of the cylinder body, the cover body being connected to the first rotating shaft and being able to rotate around the first rotating shaft; A barrier layer is disposed between the cylinder and the cover, and the barrier layer is provided with a breathable structure; one end of the barrier layer is rotatably connected to the first rotating shaft; the other end of the barrier layer cooperates with the locking part; when the locking part is in the locked state, the barrier layer is fixed to the cylinder; when the locking part is in the unlocked state, the barrier layer can rotate around the first rotating shaft.

2. The safety protection device according to claim 1, characterized in that, The cover is configured to be opened individually or simultaneously with the barrier layer when it is opened.

3. The safety protection device according to claim 1 or 2, characterized in that, At least one of the cylinder, cover, and barrier layer is made of a material selected from metals or flame-retardant materials.

4. The safety protection device according to claim 3, characterized in that, The barrier layer is made of metal, and the breathable structure is a mesh structure; the mesh size of the mesh structure is smaller than a first predetermined value; the distance between the barrier layer and the inner wall of the cylinder is smaller than a second predetermined value.

5. The safety protection device according to claim 4, characterized in that, The first predetermined value and / or the second predetermined value is 18 mm.

6. The safety protection device according to claim 1, characterized in that, An operating part is fixedly connected to the other end of the blocking layer, and the blocking layer cooperates with the locking part through the operating part.

7. The safety protection device according to claim 6, characterized in that, A second rotating shaft is fixedly provided on the outside of the cylinder; the bottom end of the locking part is rotatably connected to the second rotating shaft, the top of the locking part is provided with an inclined surface, and a slot is provided below the inclined surface; when the blocking layer falls due to gravity, the operating part contacts the inclined surface, thereby pushing the locking part to rotate around the second rotating shaft to switch from the locked state to the unlocked state. The operating part moves downward along the inclined surface until the operating part and the inclined surface separate, the operating part enters the slot, and at the same time the locking part rotates back to the locked state around the second rotating shaft.

8. The safety protection device according to claim 7, characterized in that, An elastic element is provided between the locking part and the outer wall surface of the cylinder; in the absence of external force, the elastic element keeps the locking part in a locked state; when pressure is applied to the locking part or the elastic element to compress the elastic element, the locking part switches from the locked state to the unlocked state.

9. The safety protection device according to claim 7, characterized in that, A first bracket is fixedly provided on the outside of the cylinder, and the second rotating shaft is fixedly installed on the first bracket; the first bracket is provided with a blocking mechanism on the side of the second rotating shaft away from the cylinder, which is used to limit the locking part and make the locking part in the locked state. A second bracket is fixedly provided on the outer side of the cylinder opposite to the first bracket, and the first rotating shaft is fixedly installed on the second bracket; the cover is fixedly provided with a first connecting frame that is rotatably connected to the first rotating shaft; the barrier layer is fixedly provided with a second connecting frame that is rotatably connected to the first rotating shaft; the positions of the second bracket, the first connecting frame and the second connecting frame are corresponding.

10. The safety protection device according to claim 9, characterized in that, The size of the barrier layer is smaller than the size of the inner wall of the cylinder; the cover has a first groove near the first connecting frame, and the top of the cylinder has a second groove. The first groove, the second groove, and the second connecting frame are aligned and arranged. The first groove and the second groove are used to accommodate part of the second connecting frame; the second connecting frame is bent. The cover has a third groove on the side opposite to the first groove, and the top of the cylinder has a fourth groove. The third groove, the fourth groove and the operating part are aligned and arranged. The third groove and the fourth groove are used to accommodate part of the operating part.

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