Lithium iron battery cover plate assembly and lithium iron battery

Abstract

The utility model provides a lithium iron battery cover plate assembly and a lithium iron battery, and belongs to the technical field of lithium batteries. The lithium iron battery cover plate assembly comprises a top cover plate, a blocking piece, an anti-explosion valve, a positive pole, a negative pole, a first liquid injection hole and a protection plate. Gas and electrolyte penetrate through the bent channel and enter the gas guide structure, the stop structure stops the first solid particles, the gas guide structure conveys the gas and the electrolyte to the anti-explosion valve and sprays the gas and the electrolyte out of the anti-explosion valve, the solid particles in the battery are not sprayed out of the outer side of the battery, and the lithium iron battery does not generate oxygen. The solid particles do not have three fire elements, the solid particles do not fire, gas and electrolyte in the battery are sprayed to the outer side of the battery, and the gas and the electrolyte do not burn, so that the lithium iron battery is not easy to fire or explode, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to an iron-lithium battery cover plate assembly and an iron-lithium battery. Background Art

[0002] Large-scale energy storage base stations using lithium batteries are being deployed in large numbers, storing wind power, hydropower, and other energy sources. While the capacity of the lithium batteries used in these large-scale energy storage base stations continues to grow, they face the challenge of reducing safety due to the high energy content of large-capacity lithium battery cells. When a large-scale lithium iron battery experiences thermal runaway, it does not generate oxygen on its own, and the lithium battery lacks the three elements of a fire ignition system, preventing fire. However, solid particles ejected from the lithium battery's explosion-proof valve come into contact with air. If the temperature of the ejected solid particles exceeds the ignition point, the three elements of a fire ignition system are present, making it very likely to cause a fire or explosion. Utility Model Content

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide an iron-lithium battery cover assembly and an iron-lithium battery.

[0004] The utility model proposes an iron-lithium battery cover assembly, including a top cover, a blocking member, an explosion-proof valve, a positive electrode, a negative electrode, a first liquid injection hole arranged through the top cover, and a protective plate for protecting the top of the explosion-proof valve. The explosion-proof valve, the positive electrode, and the negative electrode are respectively installed through the top cover. The blocking member includes a substrate, a first electrode opening arranged through the substrate corresponding to the positive electrode, a second electrode opening arranged through the substrate corresponding to the negative electrode, a second liquid injection hole arranged through the substrate corresponding to the first liquid injection hole, an air guide structure installed through the middle of the substrate, and four holes arranged on the top of the substrate. The gas guide structure is provided on the bottom of the explosion-proof valve, and the bottom of the explosion-proof valve is provided with a surrounding enclosing frame, a first air hole provided on the substrate, and a stopping structure provided on the substrate between the first air hole and the air guide structure. The enclosing frame is fitted and connected to the bottom end of the top cover plate, and the top end of the air guide structure is fitted and connected to the bottom end of the explosion-proof valve; the first air hole can allow gas, electrolyte and first solid particles not larger than a first preset size to pass through, the stopping structure is fitted and connected to the bottom end of the top cover plate, and forms a curved channel for gas and electrolyte to pass through with the substrate and the enclosing frame, the stopping structure is used to stop the first solid particles, and the air guide structure is used to transport gas and electrolyte to the explosion-proof valve.

[0005] Furthermore, the blocking member is a ceramic blocking member.

[0006] Furthermore, the enclosure frame includes a first side panel and a second side panel arranged opposite to each other, and the stop structure includes at least two first stop panels whose bottom ends are respectively connected to the base panel; one end of one of the two adjacent first stop panels is connected to the first side panel and the other end is disconnected from the second side panel, and one end of the other first stop panel is connected to the second side panel and the other end is disconnected from the first side panel, and the two adjacent first stop panels, the first side panel, the second side panel, and the base panel form a curved channel.

[0007] Furthermore, the gas-guiding structure includes a conveying cavity arranged inside, a second air hole arranged through the side and connected to the conveying cavity, and a third air hole arranged through the top wall and connected to the conveying cavity. The second air hole and the third air hole can both allow gas and electrolyte to pass through.

[0008] Furthermore, a snap-in groove may be provided at the bottom end of the top cover plate, and the blocking member may further include a snap-in protrusion provided at the top end of the enclosure frame and matching the snap-in groove, wherein the snap-in protrusion is snap-into the snap-in groove when the enclosure frame abuts against the top cover plate.

[0009] Furthermore, the first air holes are multiple and are respectively arranged on the left side and the right side of the air guide structure. The air guide structure includes a first side portion close to the first side plate, a second side portion close to the second side plate, a third side portion whose two ends are respectively connected to one end of the first side portion and one end of the second side portion, and a fourth side portion whose two ends are respectively connected to the other end of the first side portion and the other end of the second side portion. The second air holes are multiple and are respectively arranged on the third side portion and the fourth side portion, and the third air holes are multiple.

[0010] Furthermore, the blocking member also includes a first connecting reinforcement plate whose two ends are respectively connected to the first side portion and the first side plate, and a second connecting reinforcement plate whose two ends are respectively connected to the second side portion and the second side plate. The bottom end of the first connecting reinforcement plate and the bottom end of the second connecting reinforcement plate are respectively connected to the base plate, and the top end of the first connecting reinforcement plate and the top end of the second connecting reinforcement plate are respectively abutted against the top cover plate.

[0011] Furthermore, the enclosure frame also includes a third side panel whose two ends are respectively connected to one end of the first side panel and one end of the second side panel, and a fourth side panel whose two ends are respectively connected to the other end of the first side panel and the other end of the second side panel. A third liquid injection hole is provided on the first part of the base plate close to the third side panel and / or the second part close to the fourth side panel.

[0012] Furthermore, the blocking member also includes a third connecting reinforcement plate for increasing strength, the bottom end of the third connecting reinforcement plate is connected to one of the first part and the second part of the base plate, one end of the third connecting reinforcement plate is connected to one of the first side plate and the second side plate, and a flow channel for allowing electrolyte to pass through is provided between the other end of the third connecting reinforcement plate and the enclosure frame.

[0013] An iron-lithium battery comprises a shell and the iron-lithium battery cover assembly, wherein the shell is connected to the bottom end of a substrate.

[0014] The iron-lithium battery cover plate assembly and the iron-lithium battery of the utility model have the following beneficial effects:

[0015] When the iron-lithium battery thermally runs away, the gas, solid particles and electrolyte in the battery will be ejected from the blocking member. The first air hole can allow gas, electrolyte and first solid particles no larger than a first preset size to pass through. Since the enclosure frame is tightly connected to the bottom end of the top cover plate, the gas, first solid particles and electrolyte can only move toward the gas guide structure. The gas and electrolyte pass through the curved channel and enter the gas guide structure. The stop structure stops the first solid particles. The gas guide structure transports the gas and electrolyte to the explosion-proof valve and ejects them from the explosion-proof valve. The solid particles in the battery are not ejected to the outside of the battery. The iron-lithium battery itself does not produce oxygen, so the solid particles do not have the conditions for the three elements of fire, and the solid particles will not catch fire. The gas and electrolyte in the battery are ejected to the outside of the battery. The gas and electrolyte will not burn themselves, so the iron-lithium battery is not prone to fire or explosion, thereby improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0017] Figure 1 This is a schematic diagram of an explosion when the explosion-proof valve in an iron-lithium battery cover plate assembly of an embodiment of the utility model is not installed on the top cover plate, the protective plate is omitted, and the scene is viewed obliquely downward;

[0018] Figure 2 This is a schematic diagram of an explosion when the protective plate of an iron-lithium battery cover assembly in an embodiment of the utility model is not installed on the top of the explosion-proof valve and is viewed obliquely upward;

[0019] Figure 3 This is a structural schematic diagram of a top cover plate in an iron-lithium battery cover plate assembly according to an embodiment of the present invention when viewed obliquely upward;

[0020] Figure 4 This is a structural schematic diagram of a blocking member in an iron-lithium battery cover assembly according to an embodiment of the present invention when viewed obliquely upward;

[0021] Figure 5This is a top view of a blocking member in an iron-lithium battery cover assembly according to an embodiment of the present utility model.

[0022] In the figure: 1-top cover plate, 11-first liquid injection hole, 12-first mounting through hole, 13-clamping groove, 14-positive electrode identification area, 15-negative electrode identification area, 2-positive electrode column, 3-negative electrode column, 4-explosion-proof valve, 5-blocking member, 51-base plate, 52-enclosing frame, 521-first side plate, 522-second side plate, 523-third side plate, 524-fourth side plate, 525-clamping protrusion, 53-first air hole, 54-stop structure, 541-first stop plate, 542-curved channel, 551-first pole opening, 552-second pole opening, 56-air guide structure, 561-second air hole, 562-third air hole, 563-fourth air hole, 57-second liquid injection hole, 581-first connection reinforcement plate, 582-second connection reinforcement plate, 591-third liquid injection hole, 592-third connection reinforcement plate, 6-protective plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other.

[0024] See also Figures 1 to 5. An iron-lithium battery cover assembly according to an embodiment of the present invention comprises a top cover plate 1, a blocking member 5, an explosion-proof valve 4, a positive electrode 2, a negative electrode 3, a first liquid injection hole 11 penetratingly provided on the top cover plate 1, and a protective plate 6 for protecting the top of the explosion-proof valve 4. The explosion-proof valve 4, the positive electrode 2, and the negative electrode 3 are respectively installed through the top cover plate 1. The blocking member 5 comprises a substrate 51, a first electrode opening 551 penetratingly provided on the substrate 51 corresponding to the positive electrode 2, a second electrode opening 552 penetratingly provided on the substrate 51 corresponding to the negative electrode 3, a second liquid injection hole 57 penetratingly provided on the substrate 51 corresponding to the first liquid injection hole 11, an air guide structure 56 penetratingly installed in the middle of the substrate 51, and a device The enclosing frame 52 is placed around the top of the substrate 51, the first air hole 53 is set through the substrate 51, and the stopping structure 54 is set on the substrate 51 between the first air hole 53 and the air guide structure 56. The enclosing frame 52 is fitly connected to the bottom end of the top cover plate 1, and the top of the air guide structure 56 is fitly connected to the bottom end of the explosion-proof valve 4; the first air hole 53 can allow gas, electrolyte and first solid particles not larger than a first preset size to pass through, the stopping structure 54 is fitly connected to the bottom end of the top cover plate 1, and together with the substrate 51 and the enclosing frame 52, it forms a curved channel 542 for gas to pass through. The stopping structure 54 is used to stop the first solid particles, and the air guide structure 56 is used to transport gas and electrolyte to the explosion-proof valve 4.

[0025] Here, the first air hole 53 allows gas, electrolyte and first solid particles not larger than the first preset size to pass through, while second solid particles larger than the first preset size cannot pass through the first air hole 53, that is, the first air hole 53 allows gas and electrolyte to pass through, and prevents second solid particles larger than the first preset size from passing through; the top end of the enclosing frame 52 is fitted and connected to the bottom end of the top cover plate 1, and the air guide structure 56 can transport gas and electrolyte to the explosion-proof valve 4, so the gas, first solid particles and electrolyte move toward the air guide structure 56, and the stop structure 54 is arranged between the first air hole 53 and the air guide structure 56, then the gas, first solid particles and electrolyte need to pass through the stop structure 54 and enter the air guide structure 56, and the stop structure 54 and the substrate 51 and the enclosing frame 52 form a curved channel 542, the gas and electrolyte pass through the curved channel 542 and enter the air guide structure 56, and the first solid particles When the solid particles enter the curved channel 542, they will be blocked by the stop structure 54. Ultimately, only gas and electrolyte will enter the gas-guiding structure 56. The gas-guiding structure 56 will transport the gas and electrolyte to the explosion-proof valve 4. The gas will be ejected from the explosion-proof valve 4. Ultimately, only gas and electrolyte will be ejected out of the battery. The gases include hydrogen, carbon monoxide, and alkanes. The solid particles are aluminum metal molten beads. High-temperature solid particles are easy to burn when in contact with air, and the electrolyte can be converted into a gaseous electrolyte. The gas and electrolyte will not burn by themselves, but will be ignited by open flames. The source of the open flame is the ejected solid particles that have not been cooled. In this application, the second solid particles are blocked in the battery and the first solid particles are in the blocking member 5. The solid particles are not in contact with the air, and the three elements of fire are not met. The solid particles are not easy to ignite or cause an explosion, and the ejected gas and electrolyte will not be ignited, thereby improving the safety of the battery.

[0026] Specifically, a first mounting through hole 12, a second mounting through hole, and a third mounting through hole are provided on the top cover plate 1. The second mounting through hole and the third mounting through hole can be respectively provided on the left and right sides of the first mounting through hole 12. The explosion-proof valve 4 is installed in the first mounting through hole 12, the positive electrode column 2 is installed in the second mounting through hole, and the negative electrode column 3 is installed in the third mounting through hole. The first electrode opening 551 is used for the lower part of the positive electrode column 2 to pass through and be connected to the positive electrode ear, and the second electrode opening 552 is used for The lower portion of the negative electrode column 3 passes through and connects to the negative electrode tab; the positive electrode column 2 matches the first electrode column opening 551, and the positive electrode column 2 can seal the first electrode column opening 551, so that gas, first solid particles and electrolyte do not pass through the first electrode column opening 551. The negative electrode column 3 matches the second electrode column opening 552, and the negative electrode column 3 can seal the second electrode column opening 552, so that gas, first solid particles and electrolyte do not pass through the second electrode column opening 552. The first injection hole 11 allows the electrolyte to pass through, and the second injection hole 57 facilitates the electrolyte to flow down and enter the battery without hindering the downward flow of the electrolyte. After the electrolyte injection is completed and the battery is formed into a finished product, the first injection hole 11 will be blocked. The protective plate 6 can be a protective patch for protecting the explosion-proof valve 4. The curved channel 542 is curved and can reduce the speed of the first solid particles until the first solid particles stop. It also includes a positive electrode identification area 14 provided on the top of the top cover plate 1 near the positive electrode column 2 and a negative electrode identification area 15 provided on the top of the top cover plate 1 near the negative electrode column 3.

[0027] A snap-fit ​​groove 13 may be provided at the bottom end of the top cover plate 1 , and the blocking member 5 further includes a snap-fit ​​protrusion 525 provided at the top end of the enclosure frame 52 and matching the snap-fit ​​groove 13 . The snap-fit ​​protrusion 525 is snap-fitted to the snap-fit ​​groove 13 when the enclosure frame 52 abuts against the top cover plate 1 .

[0028] Specifically, the connection stability between the blocking member 5 and the top cover plate 1 is improved by snapping the snapping protrusion 525 into the snapping groove 13 . There may be multiple snapping grooves 13 , and there may be multiple snapping protrusions 525 corresponding to the multiple snapping grooves 13 .

[0029] The blocking member 5 may be a ceramic blocking member.

[0030] Specifically, the barrier 5 is made of an insulating and fireproof material and will not be damaged by high temperatures. The ceramic barrier 5 can be insulating and fireproof to avoid being damaged by high temperatures.

[0031] The enclosure frame 52 may include a first side panel 521 and a second side panel 522 that are arranged opposite to each other, and the stop structure 54 includes at least two first stop panels 541 whose bottom ends are respectively connected to the base plate 51; one end of one of the two adjacent first stop panels 541 is connected to the first side panel 521 and the other end is disconnected from the second side panel 522, and one end of the other first stop panel 541 is connected to the second side panel 522 and the other end is disconnected from the first side panel 521. The two adjacent first stop panels 541, the first side panel 521, the second side panel 522, and the base plate 51 form a curved channel 542.

[0032] Specifically, the first side panel 521 and the second side panel 522 are arranged in parallel, and the enclosure frame 52 can be a rectangular frame, and the first side panel 521 and the second side panel 522 are the long sides of the enclosure frame 52. In two adjacent first stop panels 541, one end of the first stop panel 541 is connected to the first side panel 521 and the other end is disconnected from the second side panel 522. A first gap is formed between the first first stop panel 541 and the second side panel 522. One end of the other first stop panel 541 is connected to the second side panel 522 and the other end is disconnected from the first side panel 521. A second gap is formed between the second first stop panel 541 and the first side panel 521. The first gap and the second gap are respectively arranged on both sides of the axis of the base panel 51, and a first channel is provided between the two adjacent first stop panels 541. The curved channel 542 is formed by the first notch, the first channel, and the second notch. When the gas, first solid particles, and electrolyte pass through the first notch and enter the first channel, they undergo a first turn. When the gas, first solid particles, and electrolyte pass through the first notch from the first channel, they undergo a second turn. During multiple turns, the first stop plate 541 blocks the first solid particles, allowing the curved channel 542 to pass through. The multiple turns during the passage of the gas and electrolyte slow down the first solid particles carried in the gas, thereby blocking and intercepting them. The gas and electrolyte pass through the curved channel 542 and reach the gas guide structure 56 and explosion-proof valve 4 in sequence, and are ejected from the explosion-proof valve 4.

[0033] Specifically, the first side plate 521 is parallel to the second side plate 522 , the first stop plate 541 may be perpendicular to the first side plate 521 , and a plurality of first stop plates 541 are arranged in parallel.

[0034] The gas-guiding structure 56 may include an internal conveying cavity, a second air hole 561 penetrating the side and communicating with the conveying cavity, and a third air hole 562 penetrating the top wall and communicating with the conveying cavity. Both the second air hole 561 and the third air hole 562 can allow gas and electrolyte to pass through.

[0035] Specifically, the gas guiding structure 56 further includes a fourth air hole 563 provided on the bottom wall and communicating with the conveying cavity. The fourth air hole 563 allows gas to pass through but prevents the first solid particles from passing through.

[0036] There can be multiple first air holes 53 , multiple second air holes 561 , and multiple third air holes 562 .

[0037] The first air holes 53 can be a plurality of holes respectively arranged on the left side and the right side of the air guide structure 56. The air guide structure 56 includes a first side portion close to the first side plate 521, a second side portion close to the second side plate 522, a third side portion whose two ends are respectively connected to one end of the first side portion and one end of the second side portion, and a fourth side portion whose two ends are respectively connected to the other end of the first side portion and the other end of the second side portion. The second air holes 561 are a plurality of holes respectively arranged on the third side portion and the fourth side portion.

[0038] The blocking member 5 can also include a first connecting reinforcing plate 581 whose two ends are respectively connected to the first side portion and the first side plate 521, and a second connecting reinforcing plate 582 whose two ends are respectively connected to the second side portion and the second side plate 522. The bottom end of the first connecting reinforcing plate 581 and the bottom end of the second connecting reinforcing plate 582 are respectively connected to the base plate 51, and the top end of the first connecting reinforcing plate 581 and the top end of the second connecting reinforcing plate 582 are respectively abutted against the top cover plate 1.

[0039] Specifically, the axes of the first connection reinforcement plate 581 and the second connection reinforcement plate 582 may coincide, the first connection reinforcement plate 581 may be perpendicularly connected to the first side plate 521, and the second connection reinforcement plate 582 may be perpendicularly connected to the second side plate 522. There may be multiple first connection reinforcement plates 581 arranged in parallel, and there may be multiple second connection reinforcement plates 582 arranged in parallel.

[0040] The enclosure frame 52 can also include a third side panel 523 whose two ends are respectively connected to one end of the first side panel 521 and one end of the second side panel 522, and a fourth side panel 524 whose two ends are respectively connected to the other end of the first side panel 521 and the other end of the second side panel 522. A third liquid injection hole 591 is provided on the first part of the substrate 51 close to the third side panel 523 and / or the second part close to the fourth side panel 524.

[0041] Specifically, the third side plate 523 is perpendicular to the first side plate 521, and the fourth side plate 524 is parallel to the third side plate 523. After the electrolyte flows into the substrate 51 from the first injection hole 11, the pressure is relatively high, and the electrolyte will flow toward the surrounding area, pass through the curved channel 542, and flow into the third injection hole 591.

[0042] The blocking member 5 may also include a third connection reinforcement plate 592 for increasing strength, the bottom end of the third connection reinforcement plate 592 is connected to one of the first part and the second part of the substrate 51, one end of the third connection reinforcement plate 592 is connected to one of the first side plate 521 and the second side plate 522, and a flow channel for allowing electrolyte to pass through is provided between the other end of the third connection reinforcement plate 592 and the enclosure frame 52.

[0043] Specifically, after the electrolyte flows onto the substrate 51 , it passes through the curved channel 542 and the circulation channel in sequence and flows into the third injection hole 591 .

[0044] Specifically, in this application, a blocking member 5 is designed at the original lower plastic part position below the top cover plate 1. This allows the electrolyte and gas to be ejected, but prevents other solid particles from being ejected. This prevents the ejected electrolyte from igniting, thereby preventing the iron-lithium battery from catching fire and exploding. The blocking member 5 is provided with a first air hole 53, which allows gas to pass through and prevents the passage of second solid particles exceeding a first preset size. The blocking member 5 is provided with a curved channel 542 and a first stop plate 541. The curved channel 542 allows gas and electrolyte to pass through. The gas and electrolyte undergo multiple turns during passage, which can slow down the first solid particles carried in the gas and thus be blocked and intercepted. The gas and electrolyte reach the explosion-proof valve 4 through the curved channel 542 and are ejected from the explosion-proof valve 4. The multiple first air holes 53 of the present application allow gas, electrolyte and first solid particles to pass through, but can prevent second solid particles from passing through. A curved channel 542 is designed, so gas and electrolyte can pass through smoothly, but the first solid particles cannot pass through smoothly. Gas and electrolyte run from the lower end core package through the first air holes 53 to the curved channel 542. In the curved channel 542, the gas and electrolyte undergo multiple turns, and the first solid particles mixed in the gas will be blocked. The gas and electrolyte pass through the curved channel 542 and reach the bottom of the explosion-proof valve 4 and are ejected from the explosion-proof valve 4, and high-temperature solid particles will not be ejected. In the present application, the second solid particles are blocked in the battery and the first solid particles are in the blocking member 5. The solid particles are not in contact with the air, and the three elements of fire are not met. The solid particles are not easy to ignite or cause an explosion, and the ejected electrolyte will not be ignited.

[0045] Specifically, 1. It can improve the safety of large-capacity iron-lithium energy storage lithium batteries and promote the development of large-capacity iron-lithium energy storage lithium batteries in the industry; 2. After the capacity of lithium batteries is increased, the cost of lithium batteries and energy storage containers will be greatly reduced, which will be more easily accepted by consumers; 3. This application utilizes the space of the original lower plastic part on the top of the lithium battery and does not occupy the pole piece space; 4. The barrier 5 is a ceramic barrier 5, and the material of the barrier 5 is an insulating and fire-proof material, which will not be damaged by high temperature.

[0046] The iron lithium battery comprises a shell, an iron lithium battery cover plate assembly as in the above embodiment, and the shell is connected to the bottom end of the base plate 51.

[0047] The above-described content can be implemented individually or in various combinations, and these variations are within the protection scope of the utility model.

[0048] It should be noted that in the description of the present application, the terms "upper end", "lower end", "bottom end" indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An iron-lithium battery cover plate assembly, characterized in that: The invention comprises a top cover plate (1), a blocking member (5), an explosion-proof valve (4), a positive electrode (2), a negative electrode (3), a first liquid injection hole (11) penetrating the top cover plate (1), and a protective plate (6) for protecting the top of the explosion-proof valve (4); the explosion-proof valve (4), the positive electrode (2), and the negative electrode (3) are respectively installed through the top cover plate (1); the blocking member (5) comprises a substrate (51), a first electrode opening (551) penetrating the substrate (51) corresponding to the positive electrode (2), a second electrode opening (552) penetrating the substrate (51) corresponding to the negative electrode (3), a second liquid injection hole (57) penetrating the substrate (51) corresponding to the first liquid injection hole (11), an air guide structure (56) penetrating the middle of the substrate (51), and four gas guides (56) installed at the top of the substrate (51). The invention relates to a device comprising a surrounding baffle frame (52), a first air hole (53) provided on the substrate (51), and a stop structure (54) provided on the substrate (51) between the first air hole (53) and the air guide structure (56), wherein the surrounding baffle frame (52) is connected to the bottom end of the top cover plate (1), and the top end of the air guide structure (56) is connected to the bottom end of the explosion-proof valve (4); the first air hole (53) allows gas, electrolyte and first solid particles not larger than a first preset size to pass through, the stop structure (54) is connected to the bottom end of the top cover plate (1), and forms a curved channel (542) for gas and electrolyte to pass through with the substrate (51) and the surrounding baffle frame (52), the stop structure (54) is used to stop the first solid particles, and the air guide structure (56) is used to transport gas and electrolyte to the explosion-proof valve (4).

2. The iron-lithium battery cover plate assembly according to claim 1, characterized in that: The blocking member (5) is a ceramic blocking member.

3. The iron-lithium battery cover plate assembly according to claim 1 or 2, characterized in that: The enclosure frame (52) includes a first side plate (521) and a second side plate (522) that are arranged opposite to each other, and the stop structure (54) includes at least two first stop plates (541) whose bottom ends are respectively connected to the base plate (51); one end of one of the two adjacent first stop plates (541) is connected to the first side plate (521) and the other end is disconnected from the second side plate (522), and the other end of the other first stop plate (541) is connected to the second side plate (522) and the other end is disconnected from the first side plate (521), and the two adjacent first stop plates (541), the first side plate (521), the second side plate (522), and the base plate (51) form a curved channel (542).

4. The iron-lithium battery cover plate assembly according to claim 3, characterized in that: The gas guide structure (56) comprises a conveying cavity provided inside, a second air hole (561) provided through the side and in communication with the conveying cavity, and a third air hole (562) provided through the top wall and in communication with the conveying cavity. The second air hole (561) and the third air hole (562) can both allow gas and electrolyte to pass through.

5. The iron-lithium battery cover plate assembly according to claim 1 or 2, characterized in that: The bottom end of the top cover plate (1) may be provided with a snap-fitting groove (13), and the blocking member (5) further includes a snap-fitting protrusion (525) provided at the top end of the enclosure frame (52) and matching the snap-fitting groove (13), wherein the snap-fitting protrusion (525) is snap-fitted to the snap-fitting groove (13) when the enclosure frame (52) abuts against the top cover plate (1).

6. The iron-lithium battery cover plate assembly according to claim 4, characterized in that: The first air holes (53) are multiple and are respectively arranged on the left side of the air guide structure (56) and the right side of the air guide structure (56). The air guide structure (56) includes a first side portion close to the first side plate (521), a second side portion close to the second side plate (522), a third side portion whose two ends are respectively connected to one end of the first side portion and one end of the second side portion, and a fourth side portion whose two ends are respectively connected to the other end of the first side portion and the other end of the second side portion. The second air holes (561) are multiple and are respectively arranged on the third side portion and the fourth side portion, and the third air holes (562) are multiple.

7. The iron-lithium battery cover plate assembly according to claim 6, characterized in that: The blocking member (5) further comprises a first connecting reinforcing plate (581) whose two ends are respectively connected to the first side portion and the first side plate (521), and a second connecting reinforcing plate (582) whose two ends are respectively connected to the second side portion and the second side plate (522), wherein the bottom ends of the first connecting reinforcing plate (581) and the second connecting reinforcing plate (582) are respectively connected to the base plate (51), and the top ends of the first connecting reinforcing plate (581) and the second connecting reinforcing plate (582) are respectively in contact with the top cover plate (1).

8. The iron-lithium battery cover plate assembly according to claim 3, characterized in that: The enclosure frame (52) further comprises a third side plate (523) whose two ends are respectively connected to one end of the first side plate (521) and one end of the second side plate (522), and a fourth side plate (524) whose two ends are respectively connected to the other end of the first side plate (521) and the other end of the second side plate (522). A third liquid injection hole (591) is provided on a first portion of the base plate (51) close to the third side plate (523) and / or a second portion close to the fourth side plate (524).

9. The iron-lithium battery cover plate assembly according to claim 8, characterized in that: The blocking member (5) further includes a third connection reinforcement plate (592) for increasing strength, wherein the bottom end of the third connection reinforcement plate (592) is connected to one of the first part and the second part of the base plate (51), one end of the third connection reinforcement plate (592) is connected to one of the first side plate (521) and the second side plate (522), and a flow channel for allowing electrolyte to pass through is provided between the other end of the third connection reinforcement plate (592) and the enclosure frame (52).

10. An iron-lithium battery, characterized in that: The iron-lithium battery cover plate assembly comprises a shell and any one of claims 1 to 9, wherein the shell is connected to the bottom end of the substrate (51).

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